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author | David Walter Seikel | 2013-01-13 18:54:10 +1000 |
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committer | David Walter Seikel | 2013-01-13 18:54:10 +1000 |
commit | 959831f4ef5a3e797f576c3de08cd65032c997ad (patch) | |
tree | e7351908be5995f0b325b2ebeaa02d5a34b82583 /libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c | |
parent | Add info about changes to Irrlicht. (diff) | |
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Remove damned ancient DOS line endings from Irrlicht. Hopefully I did not go overboard.
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c | 10274 |
1 files changed, 5137 insertions, 5137 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c index 49ef79f..dcdf7ce 100644 --- a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c +++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jidctint.c | |||
@@ -1,5137 +1,5137 @@ | |||
1 | /* | 1 | /* |
2 | * jidctint.c | 2 | * jidctint.c |
3 | * | 3 | * |
4 | * Copyright (C) 1991-1998, Thomas G. Lane. | 4 | * Copyright (C) 1991-1998, Thomas G. Lane. |
5 | * Modification developed 2002-2009 by Guido Vollbeding. | 5 | * Modification developed 2002-2009 by Guido Vollbeding. |
6 | * This file is part of the Independent JPEG Group's software. | 6 | * This file is part of the Independent JPEG Group's software. |
7 | * For conditions of distribution and use, see the accompanying README file. | 7 | * For conditions of distribution and use, see the accompanying README file. |
8 | * | 8 | * |
9 | * This file contains a slow-but-accurate integer implementation of the | 9 | * This file contains a slow-but-accurate integer implementation of the |
10 | * inverse DCT (Discrete Cosine Transform). In the IJG code, this routine | 10 | * inverse DCT (Discrete Cosine Transform). In the IJG code, this routine |
11 | * must also perform dequantization of the input coefficients. | 11 | * must also perform dequantization of the input coefficients. |
12 | * | 12 | * |
13 | * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT | 13 | * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT |
14 | * on each row (or vice versa, but it's more convenient to emit a row at | 14 | * on each row (or vice versa, but it's more convenient to emit a row at |
15 | * a time). Direct algorithms are also available, but they are much more | 15 | * a time). Direct algorithms are also available, but they are much more |
16 | * complex and seem not to be any faster when reduced to code. | 16 | * complex and seem not to be any faster when reduced to code. |
17 | * | 17 | * |
18 | * This implementation is based on an algorithm described in | 18 | * This implementation is based on an algorithm described in |
19 | * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT | 19 | * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT |
20 | * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, | 20 | * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, |
21 | * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. | 21 | * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. |
22 | * The primary algorithm described there uses 11 multiplies and 29 adds. | 22 | * The primary algorithm described there uses 11 multiplies and 29 adds. |
23 | * We use their alternate method with 12 multiplies and 32 adds. | 23 | * We use their alternate method with 12 multiplies and 32 adds. |
24 | * The advantage of this method is that no data path contains more than one | 24 | * The advantage of this method is that no data path contains more than one |
25 | * multiplication; this allows a very simple and accurate implementation in | 25 | * multiplication; this allows a very simple and accurate implementation in |
26 | * scaled fixed-point arithmetic, with a minimal number of shifts. | 26 | * scaled fixed-point arithmetic, with a minimal number of shifts. |
27 | * | 27 | * |
28 | * We also provide IDCT routines with various output sample block sizes for | 28 | * We also provide IDCT routines with various output sample block sizes for |
29 | * direct resolution reduction or enlargement and for direct resolving the | 29 | * direct resolution reduction or enlargement and for direct resolving the |
30 | * common 2x1 and 1x2 subsampling cases without additional resampling: NxN | 30 | * common 2x1 and 1x2 subsampling cases without additional resampling: NxN |
31 | * (N=1...16), 2NxN, and Nx2N (N=1...8) pixels for one 8x8 input DCT block. | 31 | * (N=1...16), 2NxN, and Nx2N (N=1...8) pixels for one 8x8 input DCT block. |
32 | * | 32 | * |
33 | * For N<8 we simply take the corresponding low-frequency coefficients of | 33 | * For N<8 we simply take the corresponding low-frequency coefficients of |
34 | * the 8x8 input DCT block and apply an NxN point IDCT on the sub-block | 34 | * the 8x8 input DCT block and apply an NxN point IDCT on the sub-block |
35 | * to yield the downscaled outputs. | 35 | * to yield the downscaled outputs. |
36 | * This can be seen as direct low-pass downsampling from the DCT domain | 36 | * This can be seen as direct low-pass downsampling from the DCT domain |
37 | * point of view rather than the usual spatial domain point of view, | 37 | * point of view rather than the usual spatial domain point of view, |
38 | * yielding significant computational savings and results at least | 38 | * yielding significant computational savings and results at least |
39 | * as good as common bilinear (averaging) spatial downsampling. | 39 | * as good as common bilinear (averaging) spatial downsampling. |
40 | * | 40 | * |
41 | * For N>8 we apply a partial NxN IDCT on the 8 input coefficients as | 41 | * For N>8 we apply a partial NxN IDCT on the 8 input coefficients as |
42 | * lower frequencies and higher frequencies assumed to be zero. | 42 | * lower frequencies and higher frequencies assumed to be zero. |
43 | * It turns out that the computational effort is similar to the 8x8 IDCT | 43 | * It turns out that the computational effort is similar to the 8x8 IDCT |
44 | * regarding the output size. | 44 | * regarding the output size. |
45 | * Furthermore, the scaling and descaling is the same for all IDCT sizes. | 45 | * Furthermore, the scaling and descaling is the same for all IDCT sizes. |
46 | * | 46 | * |
47 | * CAUTION: We rely on the FIX() macro except for the N=1,2,4,8 cases | 47 | * CAUTION: We rely on the FIX() macro except for the N=1,2,4,8 cases |
48 | * since there would be too many additional constants to pre-calculate. | 48 | * since there would be too many additional constants to pre-calculate. |
49 | */ | 49 | */ |
50 | 50 | ||
51 | #define JPEG_INTERNALS | 51 | #define JPEG_INTERNALS |
52 | #include "jinclude.h" | 52 | #include "jinclude.h" |
53 | #include "jpeglib.h" | 53 | #include "jpeglib.h" |
54 | #include "jdct.h" /* Private declarations for DCT subsystem */ | 54 | #include "jdct.h" /* Private declarations for DCT subsystem */ |
55 | 55 | ||
56 | #ifdef DCT_ISLOW_SUPPORTED | 56 | #ifdef DCT_ISLOW_SUPPORTED |
57 | 57 | ||
58 | 58 | ||
59 | /* | 59 | /* |
60 | * This module is specialized to the case DCTSIZE = 8. | 60 | * This module is specialized to the case DCTSIZE = 8. |
61 | */ | 61 | */ |
62 | 62 | ||
63 | #if DCTSIZE != 8 | 63 | #if DCTSIZE != 8 |
64 | Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */ | 64 | Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */ |
65 | #endif | 65 | #endif |
66 | 66 | ||
67 | 67 | ||
68 | /* | 68 | /* |
69 | * The poop on this scaling stuff is as follows: | 69 | * The poop on this scaling stuff is as follows: |
70 | * | 70 | * |
71 | * Each 1-D IDCT step produces outputs which are a factor of sqrt(N) | 71 | * Each 1-D IDCT step produces outputs which are a factor of sqrt(N) |
72 | * larger than the true IDCT outputs. The final outputs are therefore | 72 | * larger than the true IDCT outputs. The final outputs are therefore |
73 | * a factor of N larger than desired; since N=8 this can be cured by | 73 | * a factor of N larger than desired; since N=8 this can be cured by |
74 | * a simple right shift at the end of the algorithm. The advantage of | 74 | * a simple right shift at the end of the algorithm. The advantage of |
75 | * this arrangement is that we save two multiplications per 1-D IDCT, | 75 | * this arrangement is that we save two multiplications per 1-D IDCT, |
76 | * because the y0 and y4 inputs need not be divided by sqrt(N). | 76 | * because the y0 and y4 inputs need not be divided by sqrt(N). |
77 | * | 77 | * |
78 | * We have to do addition and subtraction of the integer inputs, which | 78 | * We have to do addition and subtraction of the integer inputs, which |
79 | * is no problem, and multiplication by fractional constants, which is | 79 | * is no problem, and multiplication by fractional constants, which is |
80 | * a problem to do in integer arithmetic. We multiply all the constants | 80 | * a problem to do in integer arithmetic. We multiply all the constants |
81 | * by CONST_SCALE and convert them to integer constants (thus retaining | 81 | * by CONST_SCALE and convert them to integer constants (thus retaining |
82 | * CONST_BITS bits of precision in the constants). After doing a | 82 | * CONST_BITS bits of precision in the constants). After doing a |
83 | * multiplication we have to divide the product by CONST_SCALE, with proper | 83 | * multiplication we have to divide the product by CONST_SCALE, with proper |
84 | * rounding, to produce the correct output. This division can be done | 84 | * rounding, to produce the correct output. This division can be done |
85 | * cheaply as a right shift of CONST_BITS bits. We postpone shifting | 85 | * cheaply as a right shift of CONST_BITS bits. We postpone shifting |
86 | * as long as possible so that partial sums can be added together with | 86 | * as long as possible so that partial sums can be added together with |
87 | * full fractional precision. | 87 | * full fractional precision. |
88 | * | 88 | * |
89 | * The outputs of the first pass are scaled up by PASS1_BITS bits so that | 89 | * The outputs of the first pass are scaled up by PASS1_BITS bits so that |
90 | * they are represented to better-than-integral precision. These outputs | 90 | * they are represented to better-than-integral precision. These outputs |
91 | * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word | 91 | * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word |
92 | * with the recommended scaling. (To scale up 12-bit sample data further, an | 92 | * with the recommended scaling. (To scale up 12-bit sample data further, an |
93 | * intermediate INT32 array would be needed.) | 93 | * intermediate INT32 array would be needed.) |
94 | * | 94 | * |
95 | * To avoid overflow of the 32-bit intermediate results in pass 2, we must | 95 | * To avoid overflow of the 32-bit intermediate results in pass 2, we must |
96 | * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis | 96 | * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis |
97 | * shows that the values given below are the most effective. | 97 | * shows that the values given below are the most effective. |
98 | */ | 98 | */ |
99 | 99 | ||
100 | #if BITS_IN_JSAMPLE == 8 | 100 | #if BITS_IN_JSAMPLE == 8 |
101 | #define CONST_BITS 13 | 101 | #define CONST_BITS 13 |
102 | #define PASS1_BITS 2 | 102 | #define PASS1_BITS 2 |
103 | #else | 103 | #else |
104 | #define CONST_BITS 13 | 104 | #define CONST_BITS 13 |
105 | #define PASS1_BITS 1 /* lose a little precision to avoid overflow */ | 105 | #define PASS1_BITS 1 /* lose a little precision to avoid overflow */ |
106 | #endif | 106 | #endif |
107 | 107 | ||
108 | /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus | 108 | /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus |
109 | * causing a lot of useless floating-point operations at run time. | 109 | * causing a lot of useless floating-point operations at run time. |
110 | * To get around this we use the following pre-calculated constants. | 110 | * To get around this we use the following pre-calculated constants. |
111 | * If you change CONST_BITS you may want to add appropriate values. | 111 | * If you change CONST_BITS you may want to add appropriate values. |
112 | * (With a reasonable C compiler, you can just rely on the FIX() macro...) | 112 | * (With a reasonable C compiler, you can just rely on the FIX() macro...) |
113 | */ | 113 | */ |
114 | 114 | ||
115 | #if CONST_BITS == 13 | 115 | #if CONST_BITS == 13 |
116 | #define FIX_0_298631336 ((INT32) 2446) /* FIX(0.298631336) */ | 116 | #define FIX_0_298631336 ((INT32) 2446) /* FIX(0.298631336) */ |
117 | #define FIX_0_390180644 ((INT32) 3196) /* FIX(0.390180644) */ | 117 | #define FIX_0_390180644 ((INT32) 3196) /* FIX(0.390180644) */ |
118 | #define FIX_0_541196100 ((INT32) 4433) /* FIX(0.541196100) */ | 118 | #define FIX_0_541196100 ((INT32) 4433) /* FIX(0.541196100) */ |
119 | #define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ | 119 | #define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ |
120 | #define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ | 120 | #define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ |
121 | #define FIX_1_175875602 ((INT32) 9633) /* FIX(1.175875602) */ | 121 | #define FIX_1_175875602 ((INT32) 9633) /* FIX(1.175875602) */ |
122 | #define FIX_1_501321110 ((INT32) 12299) /* FIX(1.501321110) */ | 122 | #define FIX_1_501321110 ((INT32) 12299) /* FIX(1.501321110) */ |
123 | #define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ | 123 | #define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ |
124 | #define FIX_1_961570560 ((INT32) 16069) /* FIX(1.961570560) */ | 124 | #define FIX_1_961570560 ((INT32) 16069) /* FIX(1.961570560) */ |
125 | #define FIX_2_053119869 ((INT32) 16819) /* FIX(2.053119869) */ | 125 | #define FIX_2_053119869 ((INT32) 16819) /* FIX(2.053119869) */ |
126 | #define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ | 126 | #define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ |
127 | #define FIX_3_072711026 ((INT32) 25172) /* FIX(3.072711026) */ | 127 | #define FIX_3_072711026 ((INT32) 25172) /* FIX(3.072711026) */ |
128 | #else | 128 | #else |
129 | #define FIX_0_298631336 FIX(0.298631336) | 129 | #define FIX_0_298631336 FIX(0.298631336) |
130 | #define FIX_0_390180644 FIX(0.390180644) | 130 | #define FIX_0_390180644 FIX(0.390180644) |
131 | #define FIX_0_541196100 FIX(0.541196100) | 131 | #define FIX_0_541196100 FIX(0.541196100) |
132 | #define FIX_0_765366865 FIX(0.765366865) | 132 | #define FIX_0_765366865 FIX(0.765366865) |
133 | #define FIX_0_899976223 FIX(0.899976223) | 133 | #define FIX_0_899976223 FIX(0.899976223) |
134 | #define FIX_1_175875602 FIX(1.175875602) | 134 | #define FIX_1_175875602 FIX(1.175875602) |
135 | #define FIX_1_501321110 FIX(1.501321110) | 135 | #define FIX_1_501321110 FIX(1.501321110) |
136 | #define FIX_1_847759065 FIX(1.847759065) | 136 | #define FIX_1_847759065 FIX(1.847759065) |
137 | #define FIX_1_961570560 FIX(1.961570560) | 137 | #define FIX_1_961570560 FIX(1.961570560) |
138 | #define FIX_2_053119869 FIX(2.053119869) | 138 | #define FIX_2_053119869 FIX(2.053119869) |
139 | #define FIX_2_562915447 FIX(2.562915447) | 139 | #define FIX_2_562915447 FIX(2.562915447) |
140 | #define FIX_3_072711026 FIX(3.072711026) | 140 | #define FIX_3_072711026 FIX(3.072711026) |
141 | #endif | 141 | #endif |
142 | 142 | ||
143 | 143 | ||
144 | /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. | 144 | /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. |
145 | * For 8-bit samples with the recommended scaling, all the variable | 145 | * For 8-bit samples with the recommended scaling, all the variable |
146 | * and constant values involved are no more than 16 bits wide, so a | 146 | * and constant values involved are no more than 16 bits wide, so a |
147 | * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. | 147 | * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. |
148 | * For 12-bit samples, a full 32-bit multiplication will be needed. | 148 | * For 12-bit samples, a full 32-bit multiplication will be needed. |
149 | */ | 149 | */ |
150 | 150 | ||
151 | #if BITS_IN_JSAMPLE == 8 | 151 | #if BITS_IN_JSAMPLE == 8 |
152 | #define MULTIPLY(var,const) MULTIPLY16C16(var,const) | 152 | #define MULTIPLY(var,const) MULTIPLY16C16(var,const) |
153 | #else | 153 | #else |
154 | #define MULTIPLY(var,const) ((var) * (const)) | 154 | #define MULTIPLY(var,const) ((var) * (const)) |
155 | #endif | 155 | #endif |
156 | 156 | ||
157 | 157 | ||
158 | /* Dequantize a coefficient by multiplying it by the multiplier-table | 158 | /* Dequantize a coefficient by multiplying it by the multiplier-table |
159 | * entry; produce an int result. In this module, both inputs and result | 159 | * entry; produce an int result. In this module, both inputs and result |
160 | * are 16 bits or less, so either int or short multiply will work. | 160 | * are 16 bits or less, so either int or short multiply will work. |
161 | */ | 161 | */ |
162 | 162 | ||
163 | #define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval)) | 163 | #define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval)) |
164 | 164 | ||
165 | 165 | ||
166 | /* | 166 | /* |
167 | * Perform dequantization and inverse DCT on one block of coefficients. | 167 | * Perform dequantization and inverse DCT on one block of coefficients. |
168 | */ | 168 | */ |
169 | 169 | ||
170 | GLOBAL(void) | 170 | GLOBAL(void) |
171 | jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 171 | jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
172 | JCOEFPTR coef_block, | 172 | JCOEFPTR coef_block, |
173 | JSAMPARRAY output_buf, JDIMENSION output_col) | 173 | JSAMPARRAY output_buf, JDIMENSION output_col) |
174 | { | 174 | { |
175 | INT32 tmp0, tmp1, tmp2, tmp3; | 175 | INT32 tmp0, tmp1, tmp2, tmp3; |
176 | INT32 tmp10, tmp11, tmp12, tmp13; | 176 | INT32 tmp10, tmp11, tmp12, tmp13; |
177 | INT32 z1, z2, z3; | 177 | INT32 z1, z2, z3; |
178 | JCOEFPTR inptr; | 178 | JCOEFPTR inptr; |
179 | ISLOW_MULT_TYPE * quantptr; | 179 | ISLOW_MULT_TYPE * quantptr; |
180 | int * wsptr; | 180 | int * wsptr; |
181 | JSAMPROW outptr; | 181 | JSAMPROW outptr; |
182 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 182 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
183 | int ctr; | 183 | int ctr; |
184 | int workspace[DCTSIZE2]; /* buffers data between passes */ | 184 | int workspace[DCTSIZE2]; /* buffers data between passes */ |
185 | SHIFT_TEMPS | 185 | SHIFT_TEMPS |
186 | 186 | ||
187 | /* Pass 1: process columns from input, store into work array. */ | 187 | /* Pass 1: process columns from input, store into work array. */ |
188 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ | 188 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ |
189 | /* furthermore, we scale the results by 2**PASS1_BITS. */ | 189 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
190 | 190 | ||
191 | inptr = coef_block; | 191 | inptr = coef_block; |
192 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 192 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
193 | wsptr = workspace; | 193 | wsptr = workspace; |
194 | for (ctr = DCTSIZE; ctr > 0; ctr--) { | 194 | for (ctr = DCTSIZE; ctr > 0; ctr--) { |
195 | /* Due to quantization, we will usually find that many of the input | 195 | /* Due to quantization, we will usually find that many of the input |
196 | * coefficients are zero, especially the AC terms. We can exploit this | 196 | * coefficients are zero, especially the AC terms. We can exploit this |
197 | * by short-circuiting the IDCT calculation for any column in which all | 197 | * by short-circuiting the IDCT calculation for any column in which all |
198 | * the AC terms are zero. In that case each output is equal to the | 198 | * the AC terms are zero. In that case each output is equal to the |
199 | * DC coefficient (with scale factor as needed). | 199 | * DC coefficient (with scale factor as needed). |
200 | * With typical images and quantization tables, half or more of the | 200 | * With typical images and quantization tables, half or more of the |
201 | * column DCT calculations can be simplified this way. | 201 | * column DCT calculations can be simplified this way. |
202 | */ | 202 | */ |
203 | 203 | ||
204 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && | 204 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && |
205 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && | 205 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && |
206 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && | 206 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && |
207 | inptr[DCTSIZE*7] == 0) { | 207 | inptr[DCTSIZE*7] == 0) { |
208 | /* AC terms all zero */ | 208 | /* AC terms all zero */ |
209 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; | 209 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; |
210 | 210 | ||
211 | wsptr[DCTSIZE*0] = dcval; | 211 | wsptr[DCTSIZE*0] = dcval; |
212 | wsptr[DCTSIZE*1] = dcval; | 212 | wsptr[DCTSIZE*1] = dcval; |
213 | wsptr[DCTSIZE*2] = dcval; | 213 | wsptr[DCTSIZE*2] = dcval; |
214 | wsptr[DCTSIZE*3] = dcval; | 214 | wsptr[DCTSIZE*3] = dcval; |
215 | wsptr[DCTSIZE*4] = dcval; | 215 | wsptr[DCTSIZE*4] = dcval; |
216 | wsptr[DCTSIZE*5] = dcval; | 216 | wsptr[DCTSIZE*5] = dcval; |
217 | wsptr[DCTSIZE*6] = dcval; | 217 | wsptr[DCTSIZE*6] = dcval; |
218 | wsptr[DCTSIZE*7] = dcval; | 218 | wsptr[DCTSIZE*7] = dcval; |
219 | 219 | ||
220 | inptr++; /* advance pointers to next column */ | 220 | inptr++; /* advance pointers to next column */ |
221 | quantptr++; | 221 | quantptr++; |
222 | wsptr++; | 222 | wsptr++; |
223 | continue; | 223 | continue; |
224 | } | 224 | } |
225 | 225 | ||
226 | /* Even part: reverse the even part of the forward DCT. */ | 226 | /* Even part: reverse the even part of the forward DCT. */ |
227 | /* The rotator is sqrt(2)*c(-6). */ | 227 | /* The rotator is sqrt(2)*c(-6). */ |
228 | 228 | ||
229 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 229 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
230 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 230 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
231 | 231 | ||
232 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); | 232 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
233 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); | 233 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
234 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); | 234 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
235 | 235 | ||
236 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 236 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
237 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 237 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
238 | z2 <<= CONST_BITS; | 238 | z2 <<= CONST_BITS; |
239 | z3 <<= CONST_BITS; | 239 | z3 <<= CONST_BITS; |
240 | /* Add fudge factor here for final descale. */ | 240 | /* Add fudge factor here for final descale. */ |
241 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); | 241 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); |
242 | 242 | ||
243 | tmp0 = z2 + z3; | 243 | tmp0 = z2 + z3; |
244 | tmp1 = z2 - z3; | 244 | tmp1 = z2 - z3; |
245 | 245 | ||
246 | tmp10 = tmp0 + tmp2; | 246 | tmp10 = tmp0 + tmp2; |
247 | tmp13 = tmp0 - tmp2; | 247 | tmp13 = tmp0 - tmp2; |
248 | tmp11 = tmp1 + tmp3; | 248 | tmp11 = tmp1 + tmp3; |
249 | tmp12 = tmp1 - tmp3; | 249 | tmp12 = tmp1 - tmp3; |
250 | 250 | ||
251 | /* Odd part per figure 8; the matrix is unitary and hence its | 251 | /* Odd part per figure 8; the matrix is unitary and hence its |
252 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. | 252 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
253 | */ | 253 | */ |
254 | 254 | ||
255 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 255 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
256 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 256 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
257 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 257 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
258 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 258 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
259 | 259 | ||
260 | z2 = tmp0 + tmp2; | 260 | z2 = tmp0 + tmp2; |
261 | z3 = tmp1 + tmp3; | 261 | z3 = tmp1 + tmp3; |
262 | 262 | ||
263 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ | 263 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
264 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ | 264 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
265 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ | 265 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
266 | z2 += z1; | 266 | z2 += z1; |
267 | z3 += z1; | 267 | z3 += z1; |
268 | 268 | ||
269 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ | 269 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
270 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ | 270 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
271 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ | 271 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
272 | tmp0 += z1 + z2; | 272 | tmp0 += z1 + z2; |
273 | tmp3 += z1 + z3; | 273 | tmp3 += z1 + z3; |
274 | 274 | ||
275 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ | 275 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
276 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ | 276 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
277 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ | 277 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
278 | tmp1 += z1 + z3; | 278 | tmp1 += z1 + z3; |
279 | tmp2 += z1 + z2; | 279 | tmp2 += z1 + z2; |
280 | 280 | ||
281 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ | 281 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
282 | 282 | ||
283 | wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); | 283 | wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); |
284 | wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); | 284 | wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); |
285 | wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); | 285 | wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); |
286 | wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); | 286 | wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); |
287 | wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); | 287 | wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); |
288 | wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); | 288 | wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); |
289 | wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); | 289 | wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); |
290 | wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); | 290 | wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); |
291 | 291 | ||
292 | inptr++; /* advance pointers to next column */ | 292 | inptr++; /* advance pointers to next column */ |
293 | quantptr++; | 293 | quantptr++; |
294 | wsptr++; | 294 | wsptr++; |
295 | } | 295 | } |
296 | 296 | ||
297 | /* Pass 2: process rows from work array, store into output array. */ | 297 | /* Pass 2: process rows from work array, store into output array. */ |
298 | /* Note that we must descale the results by a factor of 8 == 2**3, */ | 298 | /* Note that we must descale the results by a factor of 8 == 2**3, */ |
299 | /* and also undo the PASS1_BITS scaling. */ | 299 | /* and also undo the PASS1_BITS scaling. */ |
300 | 300 | ||
301 | wsptr = workspace; | 301 | wsptr = workspace; |
302 | for (ctr = 0; ctr < DCTSIZE; ctr++) { | 302 | for (ctr = 0; ctr < DCTSIZE; ctr++) { |
303 | outptr = output_buf[ctr] + output_col; | 303 | outptr = output_buf[ctr] + output_col; |
304 | /* Rows of zeroes can be exploited in the same way as we did with columns. | 304 | /* Rows of zeroes can be exploited in the same way as we did with columns. |
305 | * However, the column calculation has created many nonzero AC terms, so | 305 | * However, the column calculation has created many nonzero AC terms, so |
306 | * the simplification applies less often (typically 5% to 10% of the time). | 306 | * the simplification applies less often (typically 5% to 10% of the time). |
307 | * On machines with very fast multiplication, it's possible that the | 307 | * On machines with very fast multiplication, it's possible that the |
308 | * test takes more time than it's worth. In that case this section | 308 | * test takes more time than it's worth. In that case this section |
309 | * may be commented out. | 309 | * may be commented out. |
310 | */ | 310 | */ |
311 | 311 | ||
312 | #ifndef NO_ZERO_ROW_TEST | 312 | #ifndef NO_ZERO_ROW_TEST |
313 | if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && | 313 | if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && |
314 | wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { | 314 | wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { |
315 | /* AC terms all zero */ | 315 | /* AC terms all zero */ |
316 | JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) | 316 | JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) |
317 | & RANGE_MASK]; | 317 | & RANGE_MASK]; |
318 | 318 | ||
319 | outptr[0] = dcval; | 319 | outptr[0] = dcval; |
320 | outptr[1] = dcval; | 320 | outptr[1] = dcval; |
321 | outptr[2] = dcval; | 321 | outptr[2] = dcval; |
322 | outptr[3] = dcval; | 322 | outptr[3] = dcval; |
323 | outptr[4] = dcval; | 323 | outptr[4] = dcval; |
324 | outptr[5] = dcval; | 324 | outptr[5] = dcval; |
325 | outptr[6] = dcval; | 325 | outptr[6] = dcval; |
326 | outptr[7] = dcval; | 326 | outptr[7] = dcval; |
327 | 327 | ||
328 | wsptr += DCTSIZE; /* advance pointer to next row */ | 328 | wsptr += DCTSIZE; /* advance pointer to next row */ |
329 | continue; | 329 | continue; |
330 | } | 330 | } |
331 | #endif | 331 | #endif |
332 | 332 | ||
333 | /* Even part: reverse the even part of the forward DCT. */ | 333 | /* Even part: reverse the even part of the forward DCT. */ |
334 | /* The rotator is sqrt(2)*c(-6). */ | 334 | /* The rotator is sqrt(2)*c(-6). */ |
335 | 335 | ||
336 | z2 = (INT32) wsptr[2]; | 336 | z2 = (INT32) wsptr[2]; |
337 | z3 = (INT32) wsptr[6]; | 337 | z3 = (INT32) wsptr[6]; |
338 | 338 | ||
339 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); | 339 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
340 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); | 340 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
341 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); | 341 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
342 | 342 | ||
343 | /* Add fudge factor here for final descale. */ | 343 | /* Add fudge factor here for final descale. */ |
344 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 344 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
345 | z3 = (INT32) wsptr[4]; | 345 | z3 = (INT32) wsptr[4]; |
346 | 346 | ||
347 | tmp0 = (z2 + z3) << CONST_BITS; | 347 | tmp0 = (z2 + z3) << CONST_BITS; |
348 | tmp1 = (z2 - z3) << CONST_BITS; | 348 | tmp1 = (z2 - z3) << CONST_BITS; |
349 | 349 | ||
350 | tmp10 = tmp0 + tmp2; | 350 | tmp10 = tmp0 + tmp2; |
351 | tmp13 = tmp0 - tmp2; | 351 | tmp13 = tmp0 - tmp2; |
352 | tmp11 = tmp1 + tmp3; | 352 | tmp11 = tmp1 + tmp3; |
353 | tmp12 = tmp1 - tmp3; | 353 | tmp12 = tmp1 - tmp3; |
354 | 354 | ||
355 | /* Odd part per figure 8; the matrix is unitary and hence its | 355 | /* Odd part per figure 8; the matrix is unitary and hence its |
356 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. | 356 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
357 | */ | 357 | */ |
358 | 358 | ||
359 | tmp0 = (INT32) wsptr[7]; | 359 | tmp0 = (INT32) wsptr[7]; |
360 | tmp1 = (INT32) wsptr[5]; | 360 | tmp1 = (INT32) wsptr[5]; |
361 | tmp2 = (INT32) wsptr[3]; | 361 | tmp2 = (INT32) wsptr[3]; |
362 | tmp3 = (INT32) wsptr[1]; | 362 | tmp3 = (INT32) wsptr[1]; |
363 | 363 | ||
364 | z2 = tmp0 + tmp2; | 364 | z2 = tmp0 + tmp2; |
365 | z3 = tmp1 + tmp3; | 365 | z3 = tmp1 + tmp3; |
366 | 366 | ||
367 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ | 367 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
368 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ | 368 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
369 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ | 369 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
370 | z2 += z1; | 370 | z2 += z1; |
371 | z3 += z1; | 371 | z3 += z1; |
372 | 372 | ||
373 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ | 373 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
374 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ | 374 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
375 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ | 375 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
376 | tmp0 += z1 + z2; | 376 | tmp0 += z1 + z2; |
377 | tmp3 += z1 + z3; | 377 | tmp3 += z1 + z3; |
378 | 378 | ||
379 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ | 379 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
380 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ | 380 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
381 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ | 381 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
382 | tmp1 += z1 + z3; | 382 | tmp1 += z1 + z3; |
383 | tmp2 += z1 + z2; | 383 | tmp2 += z1 + z2; |
384 | 384 | ||
385 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ | 385 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
386 | 386 | ||
387 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, | 387 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, |
388 | CONST_BITS+PASS1_BITS+3) | 388 | CONST_BITS+PASS1_BITS+3) |
389 | & RANGE_MASK]; | 389 | & RANGE_MASK]; |
390 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, | 390 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, |
391 | CONST_BITS+PASS1_BITS+3) | 391 | CONST_BITS+PASS1_BITS+3) |
392 | & RANGE_MASK]; | 392 | & RANGE_MASK]; |
393 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, | 393 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, |
394 | CONST_BITS+PASS1_BITS+3) | 394 | CONST_BITS+PASS1_BITS+3) |
395 | & RANGE_MASK]; | 395 | & RANGE_MASK]; |
396 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, | 396 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, |
397 | CONST_BITS+PASS1_BITS+3) | 397 | CONST_BITS+PASS1_BITS+3) |
398 | & RANGE_MASK]; | 398 | & RANGE_MASK]; |
399 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, | 399 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, |
400 | CONST_BITS+PASS1_BITS+3) | 400 | CONST_BITS+PASS1_BITS+3) |
401 | & RANGE_MASK]; | 401 | & RANGE_MASK]; |
402 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, | 402 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, |
403 | CONST_BITS+PASS1_BITS+3) | 403 | CONST_BITS+PASS1_BITS+3) |
404 | & RANGE_MASK]; | 404 | & RANGE_MASK]; |
405 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, | 405 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, |
406 | CONST_BITS+PASS1_BITS+3) | 406 | CONST_BITS+PASS1_BITS+3) |
407 | & RANGE_MASK]; | 407 | & RANGE_MASK]; |
408 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, | 408 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, |
409 | CONST_BITS+PASS1_BITS+3) | 409 | CONST_BITS+PASS1_BITS+3) |
410 | & RANGE_MASK]; | 410 | & RANGE_MASK]; |
411 | 411 | ||
412 | wsptr += DCTSIZE; /* advance pointer to next row */ | 412 | wsptr += DCTSIZE; /* advance pointer to next row */ |
413 | } | 413 | } |
414 | } | 414 | } |
415 | 415 | ||
416 | #ifdef IDCT_SCALING_SUPPORTED | 416 | #ifdef IDCT_SCALING_SUPPORTED |
417 | 417 | ||
418 | 418 | ||
419 | /* | 419 | /* |
420 | * Perform dequantization and inverse DCT on one block of coefficients, | 420 | * Perform dequantization and inverse DCT on one block of coefficients, |
421 | * producing a 7x7 output block. | 421 | * producing a 7x7 output block. |
422 | * | 422 | * |
423 | * Optimized algorithm with 12 multiplications in the 1-D kernel. | 423 | * Optimized algorithm with 12 multiplications in the 1-D kernel. |
424 | * cK represents sqrt(2) * cos(K*pi/14). | 424 | * cK represents sqrt(2) * cos(K*pi/14). |
425 | */ | 425 | */ |
426 | 426 | ||
427 | GLOBAL(void) | 427 | GLOBAL(void) |
428 | jpeg_idct_7x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 428 | jpeg_idct_7x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
429 | JCOEFPTR coef_block, | 429 | JCOEFPTR coef_block, |
430 | JSAMPARRAY output_buf, JDIMENSION output_col) | 430 | JSAMPARRAY output_buf, JDIMENSION output_col) |
431 | { | 431 | { |
432 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12, tmp13; | 432 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12, tmp13; |
433 | INT32 z1, z2, z3; | 433 | INT32 z1, z2, z3; |
434 | JCOEFPTR inptr; | 434 | JCOEFPTR inptr; |
435 | ISLOW_MULT_TYPE * quantptr; | 435 | ISLOW_MULT_TYPE * quantptr; |
436 | int * wsptr; | 436 | int * wsptr; |
437 | JSAMPROW outptr; | 437 | JSAMPROW outptr; |
438 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 438 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
439 | int ctr; | 439 | int ctr; |
440 | int workspace[7*7]; /* buffers data between passes */ | 440 | int workspace[7*7]; /* buffers data between passes */ |
441 | SHIFT_TEMPS | 441 | SHIFT_TEMPS |
442 | 442 | ||
443 | /* Pass 1: process columns from input, store into work array. */ | 443 | /* Pass 1: process columns from input, store into work array. */ |
444 | 444 | ||
445 | inptr = coef_block; | 445 | inptr = coef_block; |
446 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 446 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
447 | wsptr = workspace; | 447 | wsptr = workspace; |
448 | for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { | 448 | for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { |
449 | /* Even part */ | 449 | /* Even part */ |
450 | 450 | ||
451 | tmp13 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 451 | tmp13 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
452 | tmp13 <<= CONST_BITS; | 452 | tmp13 <<= CONST_BITS; |
453 | /* Add fudge factor here for final descale. */ | 453 | /* Add fudge factor here for final descale. */ |
454 | tmp13 += ONE << (CONST_BITS-PASS1_BITS-1); | 454 | tmp13 += ONE << (CONST_BITS-PASS1_BITS-1); |
455 | 455 | ||
456 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 456 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
457 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 457 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
458 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 458 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
459 | 459 | ||
460 | tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ | 460 | tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
461 | tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ | 461 | tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
462 | tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ | 462 | tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
463 | tmp0 = z1 + z3; | 463 | tmp0 = z1 + z3; |
464 | z2 -= tmp0; | 464 | z2 -= tmp0; |
465 | tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ | 465 | tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ |
466 | tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ | 466 | tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
467 | tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ | 467 | tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
468 | tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ | 468 | tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
469 | 469 | ||
470 | /* Odd part */ | 470 | /* Odd part */ |
471 | 471 | ||
472 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 472 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
473 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 473 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
474 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 474 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
475 | 475 | ||
476 | tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ | 476 | tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
477 | tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ | 477 | tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
478 | tmp0 = tmp1 - tmp2; | 478 | tmp0 = tmp1 - tmp2; |
479 | tmp1 += tmp2; | 479 | tmp1 += tmp2; |
480 | tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ | 480 | tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
481 | tmp1 += tmp2; | 481 | tmp1 += tmp2; |
482 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ | 482 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
483 | tmp0 += z2; | 483 | tmp0 += z2; |
484 | tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ | 484 | tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
485 | 485 | ||
486 | /* Final output stage */ | 486 | /* Final output stage */ |
487 | 487 | ||
488 | wsptr[7*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 488 | wsptr[7*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
489 | wsptr[7*6] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 489 | wsptr[7*6] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
490 | wsptr[7*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); | 490 | wsptr[7*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); |
491 | wsptr[7*5] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); | 491 | wsptr[7*5] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); |
492 | wsptr[7*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); | 492 | wsptr[7*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
493 | wsptr[7*4] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); | 493 | wsptr[7*4] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
494 | wsptr[7*3] = (int) RIGHT_SHIFT(tmp13, CONST_BITS-PASS1_BITS); | 494 | wsptr[7*3] = (int) RIGHT_SHIFT(tmp13, CONST_BITS-PASS1_BITS); |
495 | } | 495 | } |
496 | 496 | ||
497 | /* Pass 2: process 7 rows from work array, store into output array. */ | 497 | /* Pass 2: process 7 rows from work array, store into output array. */ |
498 | 498 | ||
499 | wsptr = workspace; | 499 | wsptr = workspace; |
500 | for (ctr = 0; ctr < 7; ctr++) { | 500 | for (ctr = 0; ctr < 7; ctr++) { |
501 | outptr = output_buf[ctr] + output_col; | 501 | outptr = output_buf[ctr] + output_col; |
502 | 502 | ||
503 | /* Even part */ | 503 | /* Even part */ |
504 | 504 | ||
505 | /* Add fudge factor here for final descale. */ | 505 | /* Add fudge factor here for final descale. */ |
506 | tmp13 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 506 | tmp13 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
507 | tmp13 <<= CONST_BITS; | 507 | tmp13 <<= CONST_BITS; |
508 | 508 | ||
509 | z1 = (INT32) wsptr[2]; | 509 | z1 = (INT32) wsptr[2]; |
510 | z2 = (INT32) wsptr[4]; | 510 | z2 = (INT32) wsptr[4]; |
511 | z3 = (INT32) wsptr[6]; | 511 | z3 = (INT32) wsptr[6]; |
512 | 512 | ||
513 | tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ | 513 | tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
514 | tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ | 514 | tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
515 | tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ | 515 | tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
516 | tmp0 = z1 + z3; | 516 | tmp0 = z1 + z3; |
517 | z2 -= tmp0; | 517 | z2 -= tmp0; |
518 | tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ | 518 | tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ |
519 | tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ | 519 | tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
520 | tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ | 520 | tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
521 | tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ | 521 | tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
522 | 522 | ||
523 | /* Odd part */ | 523 | /* Odd part */ |
524 | 524 | ||
525 | z1 = (INT32) wsptr[1]; | 525 | z1 = (INT32) wsptr[1]; |
526 | z2 = (INT32) wsptr[3]; | 526 | z2 = (INT32) wsptr[3]; |
527 | z3 = (INT32) wsptr[5]; | 527 | z3 = (INT32) wsptr[5]; |
528 | 528 | ||
529 | tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ | 529 | tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
530 | tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ | 530 | tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
531 | tmp0 = tmp1 - tmp2; | 531 | tmp0 = tmp1 - tmp2; |
532 | tmp1 += tmp2; | 532 | tmp1 += tmp2; |
533 | tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ | 533 | tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
534 | tmp1 += tmp2; | 534 | tmp1 += tmp2; |
535 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ | 535 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
536 | tmp0 += z2; | 536 | tmp0 += z2; |
537 | tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ | 537 | tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
538 | 538 | ||
539 | /* Final output stage */ | 539 | /* Final output stage */ |
540 | 540 | ||
541 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 541 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
542 | CONST_BITS+PASS1_BITS+3) | 542 | CONST_BITS+PASS1_BITS+3) |
543 | & RANGE_MASK]; | 543 | & RANGE_MASK]; |
544 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 544 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
545 | CONST_BITS+PASS1_BITS+3) | 545 | CONST_BITS+PASS1_BITS+3) |
546 | & RANGE_MASK]; | 546 | & RANGE_MASK]; |
547 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, | 547 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
548 | CONST_BITS+PASS1_BITS+3) | 548 | CONST_BITS+PASS1_BITS+3) |
549 | & RANGE_MASK]; | 549 | & RANGE_MASK]; |
550 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, | 550 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
551 | CONST_BITS+PASS1_BITS+3) | 551 | CONST_BITS+PASS1_BITS+3) |
552 | & RANGE_MASK]; | 552 | & RANGE_MASK]; |
553 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 553 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
554 | CONST_BITS+PASS1_BITS+3) | 554 | CONST_BITS+PASS1_BITS+3) |
555 | & RANGE_MASK]; | 555 | & RANGE_MASK]; |
556 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 556 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
557 | CONST_BITS+PASS1_BITS+3) | 557 | CONST_BITS+PASS1_BITS+3) |
558 | & RANGE_MASK]; | 558 | & RANGE_MASK]; |
559 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13, | 559 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13, |
560 | CONST_BITS+PASS1_BITS+3) | 560 | CONST_BITS+PASS1_BITS+3) |
561 | & RANGE_MASK]; | 561 | & RANGE_MASK]; |
562 | 562 | ||
563 | wsptr += 7; /* advance pointer to next row */ | 563 | wsptr += 7; /* advance pointer to next row */ |
564 | } | 564 | } |
565 | } | 565 | } |
566 | 566 | ||
567 | 567 | ||
568 | /* | 568 | /* |
569 | * Perform dequantization and inverse DCT on one block of coefficients, | 569 | * Perform dequantization and inverse DCT on one block of coefficients, |
570 | * producing a reduced-size 6x6 output block. | 570 | * producing a reduced-size 6x6 output block. |
571 | * | 571 | * |
572 | * Optimized algorithm with 3 multiplications in the 1-D kernel. | 572 | * Optimized algorithm with 3 multiplications in the 1-D kernel. |
573 | * cK represents sqrt(2) * cos(K*pi/12). | 573 | * cK represents sqrt(2) * cos(K*pi/12). |
574 | */ | 574 | */ |
575 | 575 | ||
576 | GLOBAL(void) | 576 | GLOBAL(void) |
577 | jpeg_idct_6x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 577 | jpeg_idct_6x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
578 | JCOEFPTR coef_block, | 578 | JCOEFPTR coef_block, |
579 | JSAMPARRAY output_buf, JDIMENSION output_col) | 579 | JSAMPARRAY output_buf, JDIMENSION output_col) |
580 | { | 580 | { |
581 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; | 581 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; |
582 | INT32 z1, z2, z3; | 582 | INT32 z1, z2, z3; |
583 | JCOEFPTR inptr; | 583 | JCOEFPTR inptr; |
584 | ISLOW_MULT_TYPE * quantptr; | 584 | ISLOW_MULT_TYPE * quantptr; |
585 | int * wsptr; | 585 | int * wsptr; |
586 | JSAMPROW outptr; | 586 | JSAMPROW outptr; |
587 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 587 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
588 | int ctr; | 588 | int ctr; |
589 | int workspace[6*6]; /* buffers data between passes */ | 589 | int workspace[6*6]; /* buffers data between passes */ |
590 | SHIFT_TEMPS | 590 | SHIFT_TEMPS |
591 | 591 | ||
592 | /* Pass 1: process columns from input, store into work array. */ | 592 | /* Pass 1: process columns from input, store into work array. */ |
593 | 593 | ||
594 | inptr = coef_block; | 594 | inptr = coef_block; |
595 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 595 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
596 | wsptr = workspace; | 596 | wsptr = workspace; |
597 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { | 597 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { |
598 | /* Even part */ | 598 | /* Even part */ |
599 | 599 | ||
600 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 600 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
601 | tmp0 <<= CONST_BITS; | 601 | tmp0 <<= CONST_BITS; |
602 | /* Add fudge factor here for final descale. */ | 602 | /* Add fudge factor here for final descale. */ |
603 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); | 603 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
604 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 604 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
605 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ | 605 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
606 | tmp1 = tmp0 + tmp10; | 606 | tmp1 = tmp0 + tmp10; |
607 | tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS); | 607 | tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS); |
608 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 608 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
609 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ | 609 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
610 | tmp10 = tmp1 + tmp0; | 610 | tmp10 = tmp1 + tmp0; |
611 | tmp12 = tmp1 - tmp0; | 611 | tmp12 = tmp1 - tmp0; |
612 | 612 | ||
613 | /* Odd part */ | 613 | /* Odd part */ |
614 | 614 | ||
615 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 615 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
616 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 616 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
617 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 617 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
618 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ | 618 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
619 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); | 619 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
620 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); | 620 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
621 | tmp1 = (z1 - z2 - z3) << PASS1_BITS; | 621 | tmp1 = (z1 - z2 - z3) << PASS1_BITS; |
622 | 622 | ||
623 | /* Final output stage */ | 623 | /* Final output stage */ |
624 | 624 | ||
625 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 625 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
626 | wsptr[6*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 626 | wsptr[6*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
627 | wsptr[6*1] = (int) (tmp11 + tmp1); | 627 | wsptr[6*1] = (int) (tmp11 + tmp1); |
628 | wsptr[6*4] = (int) (tmp11 - tmp1); | 628 | wsptr[6*4] = (int) (tmp11 - tmp1); |
629 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); | 629 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
630 | wsptr[6*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); | 630 | wsptr[6*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
631 | } | 631 | } |
632 | 632 | ||
633 | /* Pass 2: process 6 rows from work array, store into output array. */ | 633 | /* Pass 2: process 6 rows from work array, store into output array. */ |
634 | 634 | ||
635 | wsptr = workspace; | 635 | wsptr = workspace; |
636 | for (ctr = 0; ctr < 6; ctr++) { | 636 | for (ctr = 0; ctr < 6; ctr++) { |
637 | outptr = output_buf[ctr] + output_col; | 637 | outptr = output_buf[ctr] + output_col; |
638 | 638 | ||
639 | /* Even part */ | 639 | /* Even part */ |
640 | 640 | ||
641 | /* Add fudge factor here for final descale. */ | 641 | /* Add fudge factor here for final descale. */ |
642 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 642 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
643 | tmp0 <<= CONST_BITS; | 643 | tmp0 <<= CONST_BITS; |
644 | tmp2 = (INT32) wsptr[4]; | 644 | tmp2 = (INT32) wsptr[4]; |
645 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ | 645 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
646 | tmp1 = tmp0 + tmp10; | 646 | tmp1 = tmp0 + tmp10; |
647 | tmp11 = tmp0 - tmp10 - tmp10; | 647 | tmp11 = tmp0 - tmp10 - tmp10; |
648 | tmp10 = (INT32) wsptr[2]; | 648 | tmp10 = (INT32) wsptr[2]; |
649 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ | 649 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
650 | tmp10 = tmp1 + tmp0; | 650 | tmp10 = tmp1 + tmp0; |
651 | tmp12 = tmp1 - tmp0; | 651 | tmp12 = tmp1 - tmp0; |
652 | 652 | ||
653 | /* Odd part */ | 653 | /* Odd part */ |
654 | 654 | ||
655 | z1 = (INT32) wsptr[1]; | 655 | z1 = (INT32) wsptr[1]; |
656 | z2 = (INT32) wsptr[3]; | 656 | z2 = (INT32) wsptr[3]; |
657 | z3 = (INT32) wsptr[5]; | 657 | z3 = (INT32) wsptr[5]; |
658 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ | 658 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
659 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); | 659 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
660 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); | 660 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
661 | tmp1 = (z1 - z2 - z3) << CONST_BITS; | 661 | tmp1 = (z1 - z2 - z3) << CONST_BITS; |
662 | 662 | ||
663 | /* Final output stage */ | 663 | /* Final output stage */ |
664 | 664 | ||
665 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 665 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
666 | CONST_BITS+PASS1_BITS+3) | 666 | CONST_BITS+PASS1_BITS+3) |
667 | & RANGE_MASK]; | 667 | & RANGE_MASK]; |
668 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 668 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
669 | CONST_BITS+PASS1_BITS+3) | 669 | CONST_BITS+PASS1_BITS+3) |
670 | & RANGE_MASK]; | 670 | & RANGE_MASK]; |
671 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, | 671 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
672 | CONST_BITS+PASS1_BITS+3) | 672 | CONST_BITS+PASS1_BITS+3) |
673 | & RANGE_MASK]; | 673 | & RANGE_MASK]; |
674 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, | 674 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
675 | CONST_BITS+PASS1_BITS+3) | 675 | CONST_BITS+PASS1_BITS+3) |
676 | & RANGE_MASK]; | 676 | & RANGE_MASK]; |
677 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 677 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
678 | CONST_BITS+PASS1_BITS+3) | 678 | CONST_BITS+PASS1_BITS+3) |
679 | & RANGE_MASK]; | 679 | & RANGE_MASK]; |
680 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 680 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
681 | CONST_BITS+PASS1_BITS+3) | 681 | CONST_BITS+PASS1_BITS+3) |
682 | & RANGE_MASK]; | 682 | & RANGE_MASK]; |
683 | 683 | ||
684 | wsptr += 6; /* advance pointer to next row */ | 684 | wsptr += 6; /* advance pointer to next row */ |
685 | } | 685 | } |
686 | } | 686 | } |
687 | 687 | ||
688 | 688 | ||
689 | /* | 689 | /* |
690 | * Perform dequantization and inverse DCT on one block of coefficients, | 690 | * Perform dequantization and inverse DCT on one block of coefficients, |
691 | * producing a reduced-size 5x5 output block. | 691 | * producing a reduced-size 5x5 output block. |
692 | * | 692 | * |
693 | * Optimized algorithm with 5 multiplications in the 1-D kernel. | 693 | * Optimized algorithm with 5 multiplications in the 1-D kernel. |
694 | * cK represents sqrt(2) * cos(K*pi/10). | 694 | * cK represents sqrt(2) * cos(K*pi/10). |
695 | */ | 695 | */ |
696 | 696 | ||
697 | GLOBAL(void) | 697 | GLOBAL(void) |
698 | jpeg_idct_5x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 698 | jpeg_idct_5x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
699 | JCOEFPTR coef_block, | 699 | JCOEFPTR coef_block, |
700 | JSAMPARRAY output_buf, JDIMENSION output_col) | 700 | JSAMPARRAY output_buf, JDIMENSION output_col) |
701 | { | 701 | { |
702 | INT32 tmp0, tmp1, tmp10, tmp11, tmp12; | 702 | INT32 tmp0, tmp1, tmp10, tmp11, tmp12; |
703 | INT32 z1, z2, z3; | 703 | INT32 z1, z2, z3; |
704 | JCOEFPTR inptr; | 704 | JCOEFPTR inptr; |
705 | ISLOW_MULT_TYPE * quantptr; | 705 | ISLOW_MULT_TYPE * quantptr; |
706 | int * wsptr; | 706 | int * wsptr; |
707 | JSAMPROW outptr; | 707 | JSAMPROW outptr; |
708 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 708 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
709 | int ctr; | 709 | int ctr; |
710 | int workspace[5*5]; /* buffers data between passes */ | 710 | int workspace[5*5]; /* buffers data between passes */ |
711 | SHIFT_TEMPS | 711 | SHIFT_TEMPS |
712 | 712 | ||
713 | /* Pass 1: process columns from input, store into work array. */ | 713 | /* Pass 1: process columns from input, store into work array. */ |
714 | 714 | ||
715 | inptr = coef_block; | 715 | inptr = coef_block; |
716 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 716 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
717 | wsptr = workspace; | 717 | wsptr = workspace; |
718 | for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { | 718 | for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { |
719 | /* Even part */ | 719 | /* Even part */ |
720 | 720 | ||
721 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 721 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
722 | tmp12 <<= CONST_BITS; | 722 | tmp12 <<= CONST_BITS; |
723 | /* Add fudge factor here for final descale. */ | 723 | /* Add fudge factor here for final descale. */ |
724 | tmp12 += ONE << (CONST_BITS-PASS1_BITS-1); | 724 | tmp12 += ONE << (CONST_BITS-PASS1_BITS-1); |
725 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 725 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
726 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 726 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
727 | z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ | 727 | z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ |
728 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ | 728 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ |
729 | z3 = tmp12 + z2; | 729 | z3 = tmp12 + z2; |
730 | tmp10 = z3 + z1; | 730 | tmp10 = z3 + z1; |
731 | tmp11 = z3 - z1; | 731 | tmp11 = z3 - z1; |
732 | tmp12 -= z2 << 2; | 732 | tmp12 -= z2 << 2; |
733 | 733 | ||
734 | /* Odd part */ | 734 | /* Odd part */ |
735 | 735 | ||
736 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 736 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
737 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 737 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
738 | 738 | ||
739 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ | 739 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
740 | tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ | 740 | tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
741 | tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ | 741 | tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
742 | 742 | ||
743 | /* Final output stage */ | 743 | /* Final output stage */ |
744 | 744 | ||
745 | wsptr[5*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 745 | wsptr[5*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
746 | wsptr[5*4] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 746 | wsptr[5*4] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
747 | wsptr[5*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); | 747 | wsptr[5*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); |
748 | wsptr[5*3] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); | 748 | wsptr[5*3] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); |
749 | wsptr[5*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS); | 749 | wsptr[5*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS); |
750 | } | 750 | } |
751 | 751 | ||
752 | /* Pass 2: process 5 rows from work array, store into output array. */ | 752 | /* Pass 2: process 5 rows from work array, store into output array. */ |
753 | 753 | ||
754 | wsptr = workspace; | 754 | wsptr = workspace; |
755 | for (ctr = 0; ctr < 5; ctr++) { | 755 | for (ctr = 0; ctr < 5; ctr++) { |
756 | outptr = output_buf[ctr] + output_col; | 756 | outptr = output_buf[ctr] + output_col; |
757 | 757 | ||
758 | /* Even part */ | 758 | /* Even part */ |
759 | 759 | ||
760 | /* Add fudge factor here for final descale. */ | 760 | /* Add fudge factor here for final descale. */ |
761 | tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 761 | tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
762 | tmp12 <<= CONST_BITS; | 762 | tmp12 <<= CONST_BITS; |
763 | tmp0 = (INT32) wsptr[2]; | 763 | tmp0 = (INT32) wsptr[2]; |
764 | tmp1 = (INT32) wsptr[4]; | 764 | tmp1 = (INT32) wsptr[4]; |
765 | z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ | 765 | z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ |
766 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ | 766 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ |
767 | z3 = tmp12 + z2; | 767 | z3 = tmp12 + z2; |
768 | tmp10 = z3 + z1; | 768 | tmp10 = z3 + z1; |
769 | tmp11 = z3 - z1; | 769 | tmp11 = z3 - z1; |
770 | tmp12 -= z2 << 2; | 770 | tmp12 -= z2 << 2; |
771 | 771 | ||
772 | /* Odd part */ | 772 | /* Odd part */ |
773 | 773 | ||
774 | z2 = (INT32) wsptr[1]; | 774 | z2 = (INT32) wsptr[1]; |
775 | z3 = (INT32) wsptr[3]; | 775 | z3 = (INT32) wsptr[3]; |
776 | 776 | ||
777 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ | 777 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
778 | tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ | 778 | tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
779 | tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ | 779 | tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
780 | 780 | ||
781 | /* Final output stage */ | 781 | /* Final output stage */ |
782 | 782 | ||
783 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 783 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
784 | CONST_BITS+PASS1_BITS+3) | 784 | CONST_BITS+PASS1_BITS+3) |
785 | & RANGE_MASK]; | 785 | & RANGE_MASK]; |
786 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 786 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
787 | CONST_BITS+PASS1_BITS+3) | 787 | CONST_BITS+PASS1_BITS+3) |
788 | & RANGE_MASK]; | 788 | & RANGE_MASK]; |
789 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, | 789 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
790 | CONST_BITS+PASS1_BITS+3) | 790 | CONST_BITS+PASS1_BITS+3) |
791 | & RANGE_MASK]; | 791 | & RANGE_MASK]; |
792 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, | 792 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
793 | CONST_BITS+PASS1_BITS+3) | 793 | CONST_BITS+PASS1_BITS+3) |
794 | & RANGE_MASK]; | 794 | & RANGE_MASK]; |
795 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12, | 795 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12, |
796 | CONST_BITS+PASS1_BITS+3) | 796 | CONST_BITS+PASS1_BITS+3) |
797 | & RANGE_MASK]; | 797 | & RANGE_MASK]; |
798 | 798 | ||
799 | wsptr += 5; /* advance pointer to next row */ | 799 | wsptr += 5; /* advance pointer to next row */ |
800 | } | 800 | } |
801 | } | 801 | } |
802 | 802 | ||
803 | 803 | ||
804 | /* | 804 | /* |
805 | * Perform dequantization and inverse DCT on one block of coefficients, | 805 | * Perform dequantization and inverse DCT on one block of coefficients, |
806 | * producing a reduced-size 4x4 output block. | 806 | * producing a reduced-size 4x4 output block. |
807 | * | 807 | * |
808 | * Optimized algorithm with 3 multiplications in the 1-D kernel. | 808 | * Optimized algorithm with 3 multiplications in the 1-D kernel. |
809 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. | 809 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. |
810 | */ | 810 | */ |
811 | 811 | ||
812 | GLOBAL(void) | 812 | GLOBAL(void) |
813 | jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 813 | jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
814 | JCOEFPTR coef_block, | 814 | JCOEFPTR coef_block, |
815 | JSAMPARRAY output_buf, JDIMENSION output_col) | 815 | JSAMPARRAY output_buf, JDIMENSION output_col) |
816 | { | 816 | { |
817 | INT32 tmp0, tmp2, tmp10, tmp12; | 817 | INT32 tmp0, tmp2, tmp10, tmp12; |
818 | INT32 z1, z2, z3; | 818 | INT32 z1, z2, z3; |
819 | JCOEFPTR inptr; | 819 | JCOEFPTR inptr; |
820 | ISLOW_MULT_TYPE * quantptr; | 820 | ISLOW_MULT_TYPE * quantptr; |
821 | int * wsptr; | 821 | int * wsptr; |
822 | JSAMPROW outptr; | 822 | JSAMPROW outptr; |
823 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 823 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
824 | int ctr; | 824 | int ctr; |
825 | int workspace[4*4]; /* buffers data between passes */ | 825 | int workspace[4*4]; /* buffers data between passes */ |
826 | SHIFT_TEMPS | 826 | SHIFT_TEMPS |
827 | 827 | ||
828 | /* Pass 1: process columns from input, store into work array. */ | 828 | /* Pass 1: process columns from input, store into work array. */ |
829 | 829 | ||
830 | inptr = coef_block; | 830 | inptr = coef_block; |
831 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 831 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
832 | wsptr = workspace; | 832 | wsptr = workspace; |
833 | for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) { | 833 | for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) { |
834 | /* Even part */ | 834 | /* Even part */ |
835 | 835 | ||
836 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 836 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
837 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 837 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
838 | 838 | ||
839 | tmp10 = (tmp0 + tmp2) << PASS1_BITS; | 839 | tmp10 = (tmp0 + tmp2) << PASS1_BITS; |
840 | tmp12 = (tmp0 - tmp2) << PASS1_BITS; | 840 | tmp12 = (tmp0 - tmp2) << PASS1_BITS; |
841 | 841 | ||
842 | /* Odd part */ | 842 | /* Odd part */ |
843 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ | 843 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
844 | 844 | ||
845 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 845 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
846 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 846 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
847 | 847 | ||
848 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ | 848 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
849 | /* Add fudge factor here for final descale. */ | 849 | /* Add fudge factor here for final descale. */ |
850 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); | 850 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
851 | tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */ | 851 | tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */ |
852 | CONST_BITS-PASS1_BITS); | 852 | CONST_BITS-PASS1_BITS); |
853 | tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */ | 853 | tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */ |
854 | CONST_BITS-PASS1_BITS); | 854 | CONST_BITS-PASS1_BITS); |
855 | 855 | ||
856 | /* Final output stage */ | 856 | /* Final output stage */ |
857 | 857 | ||
858 | wsptr[4*0] = (int) (tmp10 + tmp0); | 858 | wsptr[4*0] = (int) (tmp10 + tmp0); |
859 | wsptr[4*3] = (int) (tmp10 - tmp0); | 859 | wsptr[4*3] = (int) (tmp10 - tmp0); |
860 | wsptr[4*1] = (int) (tmp12 + tmp2); | 860 | wsptr[4*1] = (int) (tmp12 + tmp2); |
861 | wsptr[4*2] = (int) (tmp12 - tmp2); | 861 | wsptr[4*2] = (int) (tmp12 - tmp2); |
862 | } | 862 | } |
863 | 863 | ||
864 | /* Pass 2: process 4 rows from work array, store into output array. */ | 864 | /* Pass 2: process 4 rows from work array, store into output array. */ |
865 | 865 | ||
866 | wsptr = workspace; | 866 | wsptr = workspace; |
867 | for (ctr = 0; ctr < 4; ctr++) { | 867 | for (ctr = 0; ctr < 4; ctr++) { |
868 | outptr = output_buf[ctr] + output_col; | 868 | outptr = output_buf[ctr] + output_col; |
869 | 869 | ||
870 | /* Even part */ | 870 | /* Even part */ |
871 | 871 | ||
872 | /* Add fudge factor here for final descale. */ | 872 | /* Add fudge factor here for final descale. */ |
873 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 873 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
874 | tmp2 = (INT32) wsptr[2]; | 874 | tmp2 = (INT32) wsptr[2]; |
875 | 875 | ||
876 | tmp10 = (tmp0 + tmp2) << CONST_BITS; | 876 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
877 | tmp12 = (tmp0 - tmp2) << CONST_BITS; | 877 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
878 | 878 | ||
879 | /* Odd part */ | 879 | /* Odd part */ |
880 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ | 880 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
881 | 881 | ||
882 | z2 = (INT32) wsptr[1]; | 882 | z2 = (INT32) wsptr[1]; |
883 | z3 = (INT32) wsptr[3]; | 883 | z3 = (INT32) wsptr[3]; |
884 | 884 | ||
885 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ | 885 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
886 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ | 886 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
887 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ | 887 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
888 | 888 | ||
889 | /* Final output stage */ | 889 | /* Final output stage */ |
890 | 890 | ||
891 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 891 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
892 | CONST_BITS+PASS1_BITS+3) | 892 | CONST_BITS+PASS1_BITS+3) |
893 | & RANGE_MASK]; | 893 | & RANGE_MASK]; |
894 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 894 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
895 | CONST_BITS+PASS1_BITS+3) | 895 | CONST_BITS+PASS1_BITS+3) |
896 | & RANGE_MASK]; | 896 | & RANGE_MASK]; |
897 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 897 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
898 | CONST_BITS+PASS1_BITS+3) | 898 | CONST_BITS+PASS1_BITS+3) |
899 | & RANGE_MASK]; | 899 | & RANGE_MASK]; |
900 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 900 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
901 | CONST_BITS+PASS1_BITS+3) | 901 | CONST_BITS+PASS1_BITS+3) |
902 | & RANGE_MASK]; | 902 | & RANGE_MASK]; |
903 | 903 | ||
904 | wsptr += 4; /* advance pointer to next row */ | 904 | wsptr += 4; /* advance pointer to next row */ |
905 | } | 905 | } |
906 | } | 906 | } |
907 | 907 | ||
908 | 908 | ||
909 | /* | 909 | /* |
910 | * Perform dequantization and inverse DCT on one block of coefficients, | 910 | * Perform dequantization and inverse DCT on one block of coefficients, |
911 | * producing a reduced-size 3x3 output block. | 911 | * producing a reduced-size 3x3 output block. |
912 | * | 912 | * |
913 | * Optimized algorithm with 2 multiplications in the 1-D kernel. | 913 | * Optimized algorithm with 2 multiplications in the 1-D kernel. |
914 | * cK represents sqrt(2) * cos(K*pi/6). | 914 | * cK represents sqrt(2) * cos(K*pi/6). |
915 | */ | 915 | */ |
916 | 916 | ||
917 | GLOBAL(void) | 917 | GLOBAL(void) |
918 | jpeg_idct_3x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 918 | jpeg_idct_3x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
919 | JCOEFPTR coef_block, | 919 | JCOEFPTR coef_block, |
920 | JSAMPARRAY output_buf, JDIMENSION output_col) | 920 | JSAMPARRAY output_buf, JDIMENSION output_col) |
921 | { | 921 | { |
922 | INT32 tmp0, tmp2, tmp10, tmp12; | 922 | INT32 tmp0, tmp2, tmp10, tmp12; |
923 | JCOEFPTR inptr; | 923 | JCOEFPTR inptr; |
924 | ISLOW_MULT_TYPE * quantptr; | 924 | ISLOW_MULT_TYPE * quantptr; |
925 | int * wsptr; | 925 | int * wsptr; |
926 | JSAMPROW outptr; | 926 | JSAMPROW outptr; |
927 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 927 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
928 | int ctr; | 928 | int ctr; |
929 | int workspace[3*3]; /* buffers data between passes */ | 929 | int workspace[3*3]; /* buffers data between passes */ |
930 | SHIFT_TEMPS | 930 | SHIFT_TEMPS |
931 | 931 | ||
932 | /* Pass 1: process columns from input, store into work array. */ | 932 | /* Pass 1: process columns from input, store into work array. */ |
933 | 933 | ||
934 | inptr = coef_block; | 934 | inptr = coef_block; |
935 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 935 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
936 | wsptr = workspace; | 936 | wsptr = workspace; |
937 | for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { | 937 | for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { |
938 | /* Even part */ | 938 | /* Even part */ |
939 | 939 | ||
940 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 940 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
941 | tmp0 <<= CONST_BITS; | 941 | tmp0 <<= CONST_BITS; |
942 | /* Add fudge factor here for final descale. */ | 942 | /* Add fudge factor here for final descale. */ |
943 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); | 943 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
944 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 944 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
945 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ | 945 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
946 | tmp10 = tmp0 + tmp12; | 946 | tmp10 = tmp0 + tmp12; |
947 | tmp2 = tmp0 - tmp12 - tmp12; | 947 | tmp2 = tmp0 - tmp12 - tmp12; |
948 | 948 | ||
949 | /* Odd part */ | 949 | /* Odd part */ |
950 | 950 | ||
951 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 951 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
952 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ | 952 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
953 | 953 | ||
954 | /* Final output stage */ | 954 | /* Final output stage */ |
955 | 955 | ||
956 | wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 956 | wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
957 | wsptr[3*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 957 | wsptr[3*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
958 | wsptr[3*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS); | 958 | wsptr[3*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS); |
959 | } | 959 | } |
960 | 960 | ||
961 | /* Pass 2: process 3 rows from work array, store into output array. */ | 961 | /* Pass 2: process 3 rows from work array, store into output array. */ |
962 | 962 | ||
963 | wsptr = workspace; | 963 | wsptr = workspace; |
964 | for (ctr = 0; ctr < 3; ctr++) { | 964 | for (ctr = 0; ctr < 3; ctr++) { |
965 | outptr = output_buf[ctr] + output_col; | 965 | outptr = output_buf[ctr] + output_col; |
966 | 966 | ||
967 | /* Even part */ | 967 | /* Even part */ |
968 | 968 | ||
969 | /* Add fudge factor here for final descale. */ | 969 | /* Add fudge factor here for final descale. */ |
970 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 970 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
971 | tmp0 <<= CONST_BITS; | 971 | tmp0 <<= CONST_BITS; |
972 | tmp2 = (INT32) wsptr[2]; | 972 | tmp2 = (INT32) wsptr[2]; |
973 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ | 973 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
974 | tmp10 = tmp0 + tmp12; | 974 | tmp10 = tmp0 + tmp12; |
975 | tmp2 = tmp0 - tmp12 - tmp12; | 975 | tmp2 = tmp0 - tmp12 - tmp12; |
976 | 976 | ||
977 | /* Odd part */ | 977 | /* Odd part */ |
978 | 978 | ||
979 | tmp12 = (INT32) wsptr[1]; | 979 | tmp12 = (INT32) wsptr[1]; |
980 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ | 980 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
981 | 981 | ||
982 | /* Final output stage */ | 982 | /* Final output stage */ |
983 | 983 | ||
984 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 984 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
985 | CONST_BITS+PASS1_BITS+3) | 985 | CONST_BITS+PASS1_BITS+3) |
986 | & RANGE_MASK]; | 986 | & RANGE_MASK]; |
987 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 987 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
988 | CONST_BITS+PASS1_BITS+3) | 988 | CONST_BITS+PASS1_BITS+3) |
989 | & RANGE_MASK]; | 989 | & RANGE_MASK]; |
990 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2, | 990 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2, |
991 | CONST_BITS+PASS1_BITS+3) | 991 | CONST_BITS+PASS1_BITS+3) |
992 | & RANGE_MASK]; | 992 | & RANGE_MASK]; |
993 | 993 | ||
994 | wsptr += 3; /* advance pointer to next row */ | 994 | wsptr += 3; /* advance pointer to next row */ |
995 | } | 995 | } |
996 | } | 996 | } |
997 | 997 | ||
998 | 998 | ||
999 | /* | 999 | /* |
1000 | * Perform dequantization and inverse DCT on one block of coefficients, | 1000 | * Perform dequantization and inverse DCT on one block of coefficients, |
1001 | * producing a reduced-size 2x2 output block. | 1001 | * producing a reduced-size 2x2 output block. |
1002 | * | 1002 | * |
1003 | * Multiplication-less algorithm. | 1003 | * Multiplication-less algorithm. |
1004 | */ | 1004 | */ |
1005 | 1005 | ||
1006 | GLOBAL(void) | 1006 | GLOBAL(void) |
1007 | jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1007 | jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1008 | JCOEFPTR coef_block, | 1008 | JCOEFPTR coef_block, |
1009 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1009 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1010 | { | 1010 | { |
1011 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; | 1011 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; |
1012 | ISLOW_MULT_TYPE * quantptr; | 1012 | ISLOW_MULT_TYPE * quantptr; |
1013 | JSAMPROW outptr; | 1013 | JSAMPROW outptr; |
1014 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1014 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1015 | SHIFT_TEMPS | 1015 | SHIFT_TEMPS |
1016 | 1016 | ||
1017 | /* Pass 1: process columns from input. */ | 1017 | /* Pass 1: process columns from input. */ |
1018 | 1018 | ||
1019 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1019 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1020 | 1020 | ||
1021 | /* Column 0 */ | 1021 | /* Column 0 */ |
1022 | tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]); | 1022 | tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]); |
1023 | tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]); | 1023 | tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]); |
1024 | /* Add fudge factor here for final descale. */ | 1024 | /* Add fudge factor here for final descale. */ |
1025 | tmp4 += ONE << 2; | 1025 | tmp4 += ONE << 2; |
1026 | 1026 | ||
1027 | tmp0 = tmp4 + tmp5; | 1027 | tmp0 = tmp4 + tmp5; |
1028 | tmp2 = tmp4 - tmp5; | 1028 | tmp2 = tmp4 - tmp5; |
1029 | 1029 | ||
1030 | /* Column 1 */ | 1030 | /* Column 1 */ |
1031 | tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0+1], quantptr[DCTSIZE*0+1]); | 1031 | tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0+1], quantptr[DCTSIZE*0+1]); |
1032 | tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1+1], quantptr[DCTSIZE*1+1]); | 1032 | tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1+1], quantptr[DCTSIZE*1+1]); |
1033 | 1033 | ||
1034 | tmp1 = tmp4 + tmp5; | 1034 | tmp1 = tmp4 + tmp5; |
1035 | tmp3 = tmp4 - tmp5; | 1035 | tmp3 = tmp4 - tmp5; |
1036 | 1036 | ||
1037 | /* Pass 2: process 2 rows, store into output array. */ | 1037 | /* Pass 2: process 2 rows, store into output array. */ |
1038 | 1038 | ||
1039 | /* Row 0 */ | 1039 | /* Row 0 */ |
1040 | outptr = output_buf[0] + output_col; | 1040 | outptr = output_buf[0] + output_col; |
1041 | 1041 | ||
1042 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp0 + tmp1, 3) & RANGE_MASK]; | 1042 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp0 + tmp1, 3) & RANGE_MASK]; |
1043 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp0 - tmp1, 3) & RANGE_MASK]; | 1043 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp0 - tmp1, 3) & RANGE_MASK]; |
1044 | 1044 | ||
1045 | /* Row 1 */ | 1045 | /* Row 1 */ |
1046 | outptr = output_buf[1] + output_col; | 1046 | outptr = output_buf[1] + output_col; |
1047 | 1047 | ||
1048 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp2 + tmp3, 3) & RANGE_MASK]; | 1048 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp2 + tmp3, 3) & RANGE_MASK]; |
1049 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2 - tmp3, 3) & RANGE_MASK]; | 1049 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2 - tmp3, 3) & RANGE_MASK]; |
1050 | } | 1050 | } |
1051 | 1051 | ||
1052 | 1052 | ||
1053 | /* | 1053 | /* |
1054 | * Perform dequantization and inverse DCT on one block of coefficients, | 1054 | * Perform dequantization and inverse DCT on one block of coefficients, |
1055 | * producing a reduced-size 1x1 output block. | 1055 | * producing a reduced-size 1x1 output block. |
1056 | * | 1056 | * |
1057 | * We hardly need an inverse DCT routine for this: just take the | 1057 | * We hardly need an inverse DCT routine for this: just take the |
1058 | * average pixel value, which is one-eighth of the DC coefficient. | 1058 | * average pixel value, which is one-eighth of the DC coefficient. |
1059 | */ | 1059 | */ |
1060 | 1060 | ||
1061 | GLOBAL(void) | 1061 | GLOBAL(void) |
1062 | jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1062 | jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1063 | JCOEFPTR coef_block, | 1063 | JCOEFPTR coef_block, |
1064 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1064 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1065 | { | 1065 | { |
1066 | int dcval; | 1066 | int dcval; |
1067 | ISLOW_MULT_TYPE * quantptr; | 1067 | ISLOW_MULT_TYPE * quantptr; |
1068 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1068 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1069 | SHIFT_TEMPS | 1069 | SHIFT_TEMPS |
1070 | 1070 | ||
1071 | /* 1x1 is trivial: just take the DC coefficient divided by 8. */ | 1071 | /* 1x1 is trivial: just take the DC coefficient divided by 8. */ |
1072 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1072 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1073 | dcval = DEQUANTIZE(coef_block[0], quantptr[0]); | 1073 | dcval = DEQUANTIZE(coef_block[0], quantptr[0]); |
1074 | dcval = (int) DESCALE((INT32) dcval, 3); | 1074 | dcval = (int) DESCALE((INT32) dcval, 3); |
1075 | 1075 | ||
1076 | output_buf[0][output_col] = range_limit[dcval & RANGE_MASK]; | 1076 | output_buf[0][output_col] = range_limit[dcval & RANGE_MASK]; |
1077 | } | 1077 | } |
1078 | 1078 | ||
1079 | 1079 | ||
1080 | /* | 1080 | /* |
1081 | * Perform dequantization and inverse DCT on one block of coefficients, | 1081 | * Perform dequantization and inverse DCT on one block of coefficients, |
1082 | * producing a 9x9 output block. | 1082 | * producing a 9x9 output block. |
1083 | * | 1083 | * |
1084 | * Optimized algorithm with 10 multiplications in the 1-D kernel. | 1084 | * Optimized algorithm with 10 multiplications in the 1-D kernel. |
1085 | * cK represents sqrt(2) * cos(K*pi/18). | 1085 | * cK represents sqrt(2) * cos(K*pi/18). |
1086 | */ | 1086 | */ |
1087 | 1087 | ||
1088 | GLOBAL(void) | 1088 | GLOBAL(void) |
1089 | jpeg_idct_9x9 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1089 | jpeg_idct_9x9 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1090 | JCOEFPTR coef_block, | 1090 | JCOEFPTR coef_block, |
1091 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1091 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1092 | { | 1092 | { |
1093 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13, tmp14; | 1093 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13, tmp14; |
1094 | INT32 z1, z2, z3, z4; | 1094 | INT32 z1, z2, z3, z4; |
1095 | JCOEFPTR inptr; | 1095 | JCOEFPTR inptr; |
1096 | ISLOW_MULT_TYPE * quantptr; | 1096 | ISLOW_MULT_TYPE * quantptr; |
1097 | int * wsptr; | 1097 | int * wsptr; |
1098 | JSAMPROW outptr; | 1098 | JSAMPROW outptr; |
1099 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1099 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1100 | int ctr; | 1100 | int ctr; |
1101 | int workspace[8*9]; /* buffers data between passes */ | 1101 | int workspace[8*9]; /* buffers data between passes */ |
1102 | SHIFT_TEMPS | 1102 | SHIFT_TEMPS |
1103 | 1103 | ||
1104 | /* Pass 1: process columns from input, store into work array. */ | 1104 | /* Pass 1: process columns from input, store into work array. */ |
1105 | 1105 | ||
1106 | inptr = coef_block; | 1106 | inptr = coef_block; |
1107 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1107 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1108 | wsptr = workspace; | 1108 | wsptr = workspace; |
1109 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 1109 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
1110 | /* Even part */ | 1110 | /* Even part */ |
1111 | 1111 | ||
1112 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 1112 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
1113 | tmp0 <<= CONST_BITS; | 1113 | tmp0 <<= CONST_BITS; |
1114 | /* Add fudge factor here for final descale. */ | 1114 | /* Add fudge factor here for final descale. */ |
1115 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); | 1115 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
1116 | 1116 | ||
1117 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 1117 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
1118 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 1118 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
1119 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 1119 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
1120 | 1120 | ||
1121 | tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ | 1121 | tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ |
1122 | tmp1 = tmp0 + tmp3; | 1122 | tmp1 = tmp0 + tmp3; |
1123 | tmp2 = tmp0 - tmp3 - tmp3; | 1123 | tmp2 = tmp0 - tmp3 - tmp3; |
1124 | 1124 | ||
1125 | tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ | 1125 | tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ |
1126 | tmp11 = tmp2 + tmp0; | 1126 | tmp11 = tmp2 + tmp0; |
1127 | tmp14 = tmp2 - tmp0 - tmp0; | 1127 | tmp14 = tmp2 - tmp0 - tmp0; |
1128 | 1128 | ||
1129 | tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ | 1129 | tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ |
1130 | tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ | 1130 | tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ |
1131 | tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ | 1131 | tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ |
1132 | 1132 | ||
1133 | tmp10 = tmp1 + tmp0 - tmp3; | 1133 | tmp10 = tmp1 + tmp0 - tmp3; |
1134 | tmp12 = tmp1 - tmp0 + tmp2; | 1134 | tmp12 = tmp1 - tmp0 + tmp2; |
1135 | tmp13 = tmp1 - tmp2 + tmp3; | 1135 | tmp13 = tmp1 - tmp2 + tmp3; |
1136 | 1136 | ||
1137 | /* Odd part */ | 1137 | /* Odd part */ |
1138 | 1138 | ||
1139 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 1139 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
1140 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 1140 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
1141 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 1141 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
1142 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 1142 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
1143 | 1143 | ||
1144 | z2 = MULTIPLY(z2, - FIX(1.224744871)); /* -c3 */ | 1144 | z2 = MULTIPLY(z2, - FIX(1.224744871)); /* -c3 */ |
1145 | 1145 | ||
1146 | tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ | 1146 | tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ |
1147 | tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ | 1147 | tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ |
1148 | tmp0 = tmp2 + tmp3 - z2; | 1148 | tmp0 = tmp2 + tmp3 - z2; |
1149 | tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ | 1149 | tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ |
1150 | tmp2 += z2 - tmp1; | 1150 | tmp2 += z2 - tmp1; |
1151 | tmp3 += z2 + tmp1; | 1151 | tmp3 += z2 + tmp1; |
1152 | tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ | 1152 | tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ |
1153 | 1153 | ||
1154 | /* Final output stage */ | 1154 | /* Final output stage */ |
1155 | 1155 | ||
1156 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 1156 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
1157 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 1157 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
1158 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); | 1158 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); |
1159 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); | 1159 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); |
1160 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); | 1160 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
1161 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); | 1161 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
1162 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp13 + tmp3, CONST_BITS-PASS1_BITS); | 1162 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp13 + tmp3, CONST_BITS-PASS1_BITS); |
1163 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp13 - tmp3, CONST_BITS-PASS1_BITS); | 1163 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp13 - tmp3, CONST_BITS-PASS1_BITS); |
1164 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp14, CONST_BITS-PASS1_BITS); | 1164 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp14, CONST_BITS-PASS1_BITS); |
1165 | } | 1165 | } |
1166 | 1166 | ||
1167 | /* Pass 2: process 9 rows from work array, store into output array. */ | 1167 | /* Pass 2: process 9 rows from work array, store into output array. */ |
1168 | 1168 | ||
1169 | wsptr = workspace; | 1169 | wsptr = workspace; |
1170 | for (ctr = 0; ctr < 9; ctr++) { | 1170 | for (ctr = 0; ctr < 9; ctr++) { |
1171 | outptr = output_buf[ctr] + output_col; | 1171 | outptr = output_buf[ctr] + output_col; |
1172 | 1172 | ||
1173 | /* Even part */ | 1173 | /* Even part */ |
1174 | 1174 | ||
1175 | /* Add fudge factor here for final descale. */ | 1175 | /* Add fudge factor here for final descale. */ |
1176 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 1176 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
1177 | tmp0 <<= CONST_BITS; | 1177 | tmp0 <<= CONST_BITS; |
1178 | 1178 | ||
1179 | z1 = (INT32) wsptr[2]; | 1179 | z1 = (INT32) wsptr[2]; |
1180 | z2 = (INT32) wsptr[4]; | 1180 | z2 = (INT32) wsptr[4]; |
1181 | z3 = (INT32) wsptr[6]; | 1181 | z3 = (INT32) wsptr[6]; |
1182 | 1182 | ||
1183 | tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ | 1183 | tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ |
1184 | tmp1 = tmp0 + tmp3; | 1184 | tmp1 = tmp0 + tmp3; |
1185 | tmp2 = tmp0 - tmp3 - tmp3; | 1185 | tmp2 = tmp0 - tmp3 - tmp3; |
1186 | 1186 | ||
1187 | tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ | 1187 | tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ |
1188 | tmp11 = tmp2 + tmp0; | 1188 | tmp11 = tmp2 + tmp0; |
1189 | tmp14 = tmp2 - tmp0 - tmp0; | 1189 | tmp14 = tmp2 - tmp0 - tmp0; |
1190 | 1190 | ||
1191 | tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ | 1191 | tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ |
1192 | tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ | 1192 | tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ |
1193 | tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ | 1193 | tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ |
1194 | 1194 | ||
1195 | tmp10 = tmp1 + tmp0 - tmp3; | 1195 | tmp10 = tmp1 + tmp0 - tmp3; |
1196 | tmp12 = tmp1 - tmp0 + tmp2; | 1196 | tmp12 = tmp1 - tmp0 + tmp2; |
1197 | tmp13 = tmp1 - tmp2 + tmp3; | 1197 | tmp13 = tmp1 - tmp2 + tmp3; |
1198 | 1198 | ||
1199 | /* Odd part */ | 1199 | /* Odd part */ |
1200 | 1200 | ||
1201 | z1 = (INT32) wsptr[1]; | 1201 | z1 = (INT32) wsptr[1]; |
1202 | z2 = (INT32) wsptr[3]; | 1202 | z2 = (INT32) wsptr[3]; |
1203 | z3 = (INT32) wsptr[5]; | 1203 | z3 = (INT32) wsptr[5]; |
1204 | z4 = (INT32) wsptr[7]; | 1204 | z4 = (INT32) wsptr[7]; |
1205 | 1205 | ||
1206 | z2 = MULTIPLY(z2, - FIX(1.224744871)); /* -c3 */ | 1206 | z2 = MULTIPLY(z2, - FIX(1.224744871)); /* -c3 */ |
1207 | 1207 | ||
1208 | tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ | 1208 | tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ |
1209 | tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ | 1209 | tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ |
1210 | tmp0 = tmp2 + tmp3 - z2; | 1210 | tmp0 = tmp2 + tmp3 - z2; |
1211 | tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ | 1211 | tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ |
1212 | tmp2 += z2 - tmp1; | 1212 | tmp2 += z2 - tmp1; |
1213 | tmp3 += z2 + tmp1; | 1213 | tmp3 += z2 + tmp1; |
1214 | tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ | 1214 | tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ |
1215 | 1215 | ||
1216 | /* Final output stage */ | 1216 | /* Final output stage */ |
1217 | 1217 | ||
1218 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 1218 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
1219 | CONST_BITS+PASS1_BITS+3) | 1219 | CONST_BITS+PASS1_BITS+3) |
1220 | & RANGE_MASK]; | 1220 | & RANGE_MASK]; |
1221 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 1221 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
1222 | CONST_BITS+PASS1_BITS+3) | 1222 | CONST_BITS+PASS1_BITS+3) |
1223 | & RANGE_MASK]; | 1223 | & RANGE_MASK]; |
1224 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, | 1224 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
1225 | CONST_BITS+PASS1_BITS+3) | 1225 | CONST_BITS+PASS1_BITS+3) |
1226 | & RANGE_MASK]; | 1226 | & RANGE_MASK]; |
1227 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, | 1227 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
1228 | CONST_BITS+PASS1_BITS+3) | 1228 | CONST_BITS+PASS1_BITS+3) |
1229 | & RANGE_MASK]; | 1229 | & RANGE_MASK]; |
1230 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 1230 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
1231 | CONST_BITS+PASS1_BITS+3) | 1231 | CONST_BITS+PASS1_BITS+3) |
1232 | & RANGE_MASK]; | 1232 | & RANGE_MASK]; |
1233 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 1233 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
1234 | CONST_BITS+PASS1_BITS+3) | 1234 | CONST_BITS+PASS1_BITS+3) |
1235 | & RANGE_MASK]; | 1235 | & RANGE_MASK]; |
1236 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp3, | 1236 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp3, |
1237 | CONST_BITS+PASS1_BITS+3) | 1237 | CONST_BITS+PASS1_BITS+3) |
1238 | & RANGE_MASK]; | 1238 | & RANGE_MASK]; |
1239 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp3, | 1239 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp3, |
1240 | CONST_BITS+PASS1_BITS+3) | 1240 | CONST_BITS+PASS1_BITS+3) |
1241 | & RANGE_MASK]; | 1241 | & RANGE_MASK]; |
1242 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp14, | 1242 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp14, |
1243 | CONST_BITS+PASS1_BITS+3) | 1243 | CONST_BITS+PASS1_BITS+3) |
1244 | & RANGE_MASK]; | 1244 | & RANGE_MASK]; |
1245 | 1245 | ||
1246 | wsptr += 8; /* advance pointer to next row */ | 1246 | wsptr += 8; /* advance pointer to next row */ |
1247 | } | 1247 | } |
1248 | } | 1248 | } |
1249 | 1249 | ||
1250 | 1250 | ||
1251 | /* | 1251 | /* |
1252 | * Perform dequantization and inverse DCT on one block of coefficients, | 1252 | * Perform dequantization and inverse DCT on one block of coefficients, |
1253 | * producing a 10x10 output block. | 1253 | * producing a 10x10 output block. |
1254 | * | 1254 | * |
1255 | * Optimized algorithm with 12 multiplications in the 1-D kernel. | 1255 | * Optimized algorithm with 12 multiplications in the 1-D kernel. |
1256 | * cK represents sqrt(2) * cos(K*pi/20). | 1256 | * cK represents sqrt(2) * cos(K*pi/20). |
1257 | */ | 1257 | */ |
1258 | 1258 | ||
1259 | GLOBAL(void) | 1259 | GLOBAL(void) |
1260 | jpeg_idct_10x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1260 | jpeg_idct_10x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1261 | JCOEFPTR coef_block, | 1261 | JCOEFPTR coef_block, |
1262 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1262 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1263 | { | 1263 | { |
1264 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; | 1264 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
1265 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; | 1265 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; |
1266 | INT32 z1, z2, z3, z4, z5; | 1266 | INT32 z1, z2, z3, z4, z5; |
1267 | JCOEFPTR inptr; | 1267 | JCOEFPTR inptr; |
1268 | ISLOW_MULT_TYPE * quantptr; | 1268 | ISLOW_MULT_TYPE * quantptr; |
1269 | int * wsptr; | 1269 | int * wsptr; |
1270 | JSAMPROW outptr; | 1270 | JSAMPROW outptr; |
1271 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1271 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1272 | int ctr; | 1272 | int ctr; |
1273 | int workspace[8*10]; /* buffers data between passes */ | 1273 | int workspace[8*10]; /* buffers data between passes */ |
1274 | SHIFT_TEMPS | 1274 | SHIFT_TEMPS |
1275 | 1275 | ||
1276 | /* Pass 1: process columns from input, store into work array. */ | 1276 | /* Pass 1: process columns from input, store into work array. */ |
1277 | 1277 | ||
1278 | inptr = coef_block; | 1278 | inptr = coef_block; |
1279 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1279 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1280 | wsptr = workspace; | 1280 | wsptr = workspace; |
1281 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 1281 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
1282 | /* Even part */ | 1282 | /* Even part */ |
1283 | 1283 | ||
1284 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 1284 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
1285 | z3 <<= CONST_BITS; | 1285 | z3 <<= CONST_BITS; |
1286 | /* Add fudge factor here for final descale. */ | 1286 | /* Add fudge factor here for final descale. */ |
1287 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); | 1287 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
1288 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 1288 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
1289 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ | 1289 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
1290 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ | 1290 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
1291 | tmp10 = z3 + z1; | 1291 | tmp10 = z3 + z1; |
1292 | tmp11 = z3 - z2; | 1292 | tmp11 = z3 - z2; |
1293 | 1293 | ||
1294 | tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1), /* c0 = (c4-c8)*2 */ | 1294 | tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1), /* c0 = (c4-c8)*2 */ |
1295 | CONST_BITS-PASS1_BITS); | 1295 | CONST_BITS-PASS1_BITS); |
1296 | 1296 | ||
1297 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 1297 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
1298 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 1298 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
1299 | 1299 | ||
1300 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ | 1300 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
1301 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ | 1301 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
1302 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ | 1302 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
1303 | 1303 | ||
1304 | tmp20 = tmp10 + tmp12; | 1304 | tmp20 = tmp10 + tmp12; |
1305 | tmp24 = tmp10 - tmp12; | 1305 | tmp24 = tmp10 - tmp12; |
1306 | tmp21 = tmp11 + tmp13; | 1306 | tmp21 = tmp11 + tmp13; |
1307 | tmp23 = tmp11 - tmp13; | 1307 | tmp23 = tmp11 - tmp13; |
1308 | 1308 | ||
1309 | /* Odd part */ | 1309 | /* Odd part */ |
1310 | 1310 | ||
1311 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 1311 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
1312 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 1312 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
1313 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 1313 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
1314 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 1314 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
1315 | 1315 | ||
1316 | tmp11 = z2 + z4; | 1316 | tmp11 = z2 + z4; |
1317 | tmp13 = z2 - z4; | 1317 | tmp13 = z2 - z4; |
1318 | 1318 | ||
1319 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ | 1319 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
1320 | z5 = z3 << CONST_BITS; | 1320 | z5 = z3 << CONST_BITS; |
1321 | 1321 | ||
1322 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ | 1322 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
1323 | z4 = z5 + tmp12; | 1323 | z4 = z5 + tmp12; |
1324 | 1324 | ||
1325 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ | 1325 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
1326 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ | 1326 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
1327 | 1327 | ||
1328 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ | 1328 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
1329 | z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1)); | 1329 | z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
1330 | 1330 | ||
1331 | tmp12 = (z1 - tmp13 - z3) << PASS1_BITS; | 1331 | tmp12 = (z1 - tmp13 - z3) << PASS1_BITS; |
1332 | 1332 | ||
1333 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ | 1333 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
1334 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ | 1334 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
1335 | 1335 | ||
1336 | /* Final output stage */ | 1336 | /* Final output stage */ |
1337 | 1337 | ||
1338 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 1338 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
1339 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 1339 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
1340 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 1340 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
1341 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 1341 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
1342 | wsptr[8*2] = (int) (tmp22 + tmp12); | 1342 | wsptr[8*2] = (int) (tmp22 + tmp12); |
1343 | wsptr[8*7] = (int) (tmp22 - tmp12); | 1343 | wsptr[8*7] = (int) (tmp22 - tmp12); |
1344 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 1344 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
1345 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 1345 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
1346 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 1346 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
1347 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 1347 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
1348 | } | 1348 | } |
1349 | 1349 | ||
1350 | /* Pass 2: process 10 rows from work array, store into output array. */ | 1350 | /* Pass 2: process 10 rows from work array, store into output array. */ |
1351 | 1351 | ||
1352 | wsptr = workspace; | 1352 | wsptr = workspace; |
1353 | for (ctr = 0; ctr < 10; ctr++) { | 1353 | for (ctr = 0; ctr < 10; ctr++) { |
1354 | outptr = output_buf[ctr] + output_col; | 1354 | outptr = output_buf[ctr] + output_col; |
1355 | 1355 | ||
1356 | /* Even part */ | 1356 | /* Even part */ |
1357 | 1357 | ||
1358 | /* Add fudge factor here for final descale. */ | 1358 | /* Add fudge factor here for final descale. */ |
1359 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 1359 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
1360 | z3 <<= CONST_BITS; | 1360 | z3 <<= CONST_BITS; |
1361 | z4 = (INT32) wsptr[4]; | 1361 | z4 = (INT32) wsptr[4]; |
1362 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ | 1362 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
1363 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ | 1363 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
1364 | tmp10 = z3 + z1; | 1364 | tmp10 = z3 + z1; |
1365 | tmp11 = z3 - z2; | 1365 | tmp11 = z3 - z2; |
1366 | 1366 | ||
1367 | tmp22 = z3 - ((z1 - z2) << 1); /* c0 = (c4-c8)*2 */ | 1367 | tmp22 = z3 - ((z1 - z2) << 1); /* c0 = (c4-c8)*2 */ |
1368 | 1368 | ||
1369 | z2 = (INT32) wsptr[2]; | 1369 | z2 = (INT32) wsptr[2]; |
1370 | z3 = (INT32) wsptr[6]; | 1370 | z3 = (INT32) wsptr[6]; |
1371 | 1371 | ||
1372 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ | 1372 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
1373 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ | 1373 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
1374 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ | 1374 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
1375 | 1375 | ||
1376 | tmp20 = tmp10 + tmp12; | 1376 | tmp20 = tmp10 + tmp12; |
1377 | tmp24 = tmp10 - tmp12; | 1377 | tmp24 = tmp10 - tmp12; |
1378 | tmp21 = tmp11 + tmp13; | 1378 | tmp21 = tmp11 + tmp13; |
1379 | tmp23 = tmp11 - tmp13; | 1379 | tmp23 = tmp11 - tmp13; |
1380 | 1380 | ||
1381 | /* Odd part */ | 1381 | /* Odd part */ |
1382 | 1382 | ||
1383 | z1 = (INT32) wsptr[1]; | 1383 | z1 = (INT32) wsptr[1]; |
1384 | z2 = (INT32) wsptr[3]; | 1384 | z2 = (INT32) wsptr[3]; |
1385 | z3 = (INT32) wsptr[5]; | 1385 | z3 = (INT32) wsptr[5]; |
1386 | z3 <<= CONST_BITS; | 1386 | z3 <<= CONST_BITS; |
1387 | z4 = (INT32) wsptr[7]; | 1387 | z4 = (INT32) wsptr[7]; |
1388 | 1388 | ||
1389 | tmp11 = z2 + z4; | 1389 | tmp11 = z2 + z4; |
1390 | tmp13 = z2 - z4; | 1390 | tmp13 = z2 - z4; |
1391 | 1391 | ||
1392 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ | 1392 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
1393 | 1393 | ||
1394 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ | 1394 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
1395 | z4 = z3 + tmp12; | 1395 | z4 = z3 + tmp12; |
1396 | 1396 | ||
1397 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ | 1397 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
1398 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ | 1398 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
1399 | 1399 | ||
1400 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ | 1400 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
1401 | z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1)); | 1401 | z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
1402 | 1402 | ||
1403 | tmp12 = ((z1 - tmp13) << CONST_BITS) - z3; | 1403 | tmp12 = ((z1 - tmp13) << CONST_BITS) - z3; |
1404 | 1404 | ||
1405 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ | 1405 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
1406 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ | 1406 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
1407 | 1407 | ||
1408 | /* Final output stage */ | 1408 | /* Final output stage */ |
1409 | 1409 | ||
1410 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 1410 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
1411 | CONST_BITS+PASS1_BITS+3) | 1411 | CONST_BITS+PASS1_BITS+3) |
1412 | & RANGE_MASK]; | 1412 | & RANGE_MASK]; |
1413 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 1413 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
1414 | CONST_BITS+PASS1_BITS+3) | 1414 | CONST_BITS+PASS1_BITS+3) |
1415 | & RANGE_MASK]; | 1415 | & RANGE_MASK]; |
1416 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 1416 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
1417 | CONST_BITS+PASS1_BITS+3) | 1417 | CONST_BITS+PASS1_BITS+3) |
1418 | & RANGE_MASK]; | 1418 | & RANGE_MASK]; |
1419 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 1419 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
1420 | CONST_BITS+PASS1_BITS+3) | 1420 | CONST_BITS+PASS1_BITS+3) |
1421 | & RANGE_MASK]; | 1421 | & RANGE_MASK]; |
1422 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 1422 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
1423 | CONST_BITS+PASS1_BITS+3) | 1423 | CONST_BITS+PASS1_BITS+3) |
1424 | & RANGE_MASK]; | 1424 | & RANGE_MASK]; |
1425 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 1425 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
1426 | CONST_BITS+PASS1_BITS+3) | 1426 | CONST_BITS+PASS1_BITS+3) |
1427 | & RANGE_MASK]; | 1427 | & RANGE_MASK]; |
1428 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 1428 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
1429 | CONST_BITS+PASS1_BITS+3) | 1429 | CONST_BITS+PASS1_BITS+3) |
1430 | & RANGE_MASK]; | 1430 | & RANGE_MASK]; |
1431 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 1431 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
1432 | CONST_BITS+PASS1_BITS+3) | 1432 | CONST_BITS+PASS1_BITS+3) |
1433 | & RANGE_MASK]; | 1433 | & RANGE_MASK]; |
1434 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 1434 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
1435 | CONST_BITS+PASS1_BITS+3) | 1435 | CONST_BITS+PASS1_BITS+3) |
1436 | & RANGE_MASK]; | 1436 | & RANGE_MASK]; |
1437 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 1437 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
1438 | CONST_BITS+PASS1_BITS+3) | 1438 | CONST_BITS+PASS1_BITS+3) |
1439 | & RANGE_MASK]; | 1439 | & RANGE_MASK]; |
1440 | 1440 | ||
1441 | wsptr += 8; /* advance pointer to next row */ | 1441 | wsptr += 8; /* advance pointer to next row */ |
1442 | } | 1442 | } |
1443 | } | 1443 | } |
1444 | 1444 | ||
1445 | 1445 | ||
1446 | /* | 1446 | /* |
1447 | * Perform dequantization and inverse DCT on one block of coefficients, | 1447 | * Perform dequantization and inverse DCT on one block of coefficients, |
1448 | * producing a 11x11 output block. | 1448 | * producing a 11x11 output block. |
1449 | * | 1449 | * |
1450 | * Optimized algorithm with 24 multiplications in the 1-D kernel. | 1450 | * Optimized algorithm with 24 multiplications in the 1-D kernel. |
1451 | * cK represents sqrt(2) * cos(K*pi/22). | 1451 | * cK represents sqrt(2) * cos(K*pi/22). |
1452 | */ | 1452 | */ |
1453 | 1453 | ||
1454 | GLOBAL(void) | 1454 | GLOBAL(void) |
1455 | jpeg_idct_11x11 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1455 | jpeg_idct_11x11 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1456 | JCOEFPTR coef_block, | 1456 | JCOEFPTR coef_block, |
1457 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1457 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1458 | { | 1458 | { |
1459 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; | 1459 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
1460 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; | 1460 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
1461 | INT32 z1, z2, z3, z4; | 1461 | INT32 z1, z2, z3, z4; |
1462 | JCOEFPTR inptr; | 1462 | JCOEFPTR inptr; |
1463 | ISLOW_MULT_TYPE * quantptr; | 1463 | ISLOW_MULT_TYPE * quantptr; |
1464 | int * wsptr; | 1464 | int * wsptr; |
1465 | JSAMPROW outptr; | 1465 | JSAMPROW outptr; |
1466 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1466 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1467 | int ctr; | 1467 | int ctr; |
1468 | int workspace[8*11]; /* buffers data between passes */ | 1468 | int workspace[8*11]; /* buffers data between passes */ |
1469 | SHIFT_TEMPS | 1469 | SHIFT_TEMPS |
1470 | 1470 | ||
1471 | /* Pass 1: process columns from input, store into work array. */ | 1471 | /* Pass 1: process columns from input, store into work array. */ |
1472 | 1472 | ||
1473 | inptr = coef_block; | 1473 | inptr = coef_block; |
1474 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1474 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1475 | wsptr = workspace; | 1475 | wsptr = workspace; |
1476 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 1476 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
1477 | /* Even part */ | 1477 | /* Even part */ |
1478 | 1478 | ||
1479 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 1479 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
1480 | tmp10 <<= CONST_BITS; | 1480 | tmp10 <<= CONST_BITS; |
1481 | /* Add fudge factor here for final descale. */ | 1481 | /* Add fudge factor here for final descale. */ |
1482 | tmp10 += ONE << (CONST_BITS-PASS1_BITS-1); | 1482 | tmp10 += ONE << (CONST_BITS-PASS1_BITS-1); |
1483 | 1483 | ||
1484 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 1484 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
1485 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 1485 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
1486 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 1486 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
1487 | 1487 | ||
1488 | tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ | 1488 | tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ |
1489 | tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ | 1489 | tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ |
1490 | z4 = z1 + z3; | 1490 | z4 = z1 + z3; |
1491 | tmp24 = MULTIPLY(z4, - FIX(1.155664402)); /* -(c2-c10) */ | 1491 | tmp24 = MULTIPLY(z4, - FIX(1.155664402)); /* -(c2-c10) */ |
1492 | z4 -= z2; | 1492 | z4 -= z2; |
1493 | tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ | 1493 | tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ |
1494 | tmp21 = tmp20 + tmp23 + tmp25 - | 1494 | tmp21 = tmp20 + tmp23 + tmp25 - |
1495 | MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ | 1495 | MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ |
1496 | tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ | 1496 | tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ |
1497 | tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ | 1497 | tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ |
1498 | tmp24 += tmp25; | 1498 | tmp24 += tmp25; |
1499 | tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ | 1499 | tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ |
1500 | tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ | 1500 | tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ |
1501 | MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ | 1501 | MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ |
1502 | tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ | 1502 | tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ |
1503 | 1503 | ||
1504 | /* Odd part */ | 1504 | /* Odd part */ |
1505 | 1505 | ||
1506 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 1506 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
1507 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 1507 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
1508 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 1508 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
1509 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 1509 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
1510 | 1510 | ||
1511 | tmp11 = z1 + z2; | 1511 | tmp11 = z1 + z2; |
1512 | tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ | 1512 | tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ |
1513 | tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ | 1513 | tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ |
1514 | tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ | 1514 | tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ |
1515 | tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ | 1515 | tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ |
1516 | tmp10 = tmp11 + tmp12 + tmp13 - | 1516 | tmp10 = tmp11 + tmp12 + tmp13 - |
1517 | MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ | 1517 | MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ |
1518 | z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ | 1518 | z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ |
1519 | tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ | 1519 | tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ |
1520 | tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ | 1520 | tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ |
1521 | z1 = MULTIPLY(z2 + z4, - FIX(1.798248910)); /* -(c1+c9) */ | 1521 | z1 = MULTIPLY(z2 + z4, - FIX(1.798248910)); /* -(c1+c9) */ |
1522 | tmp11 += z1; | 1522 | tmp11 += z1; |
1523 | tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ | 1523 | tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ |
1524 | tmp14 += MULTIPLY(z2, - FIX(1.467221301)) + /* -(c5+c9) */ | 1524 | tmp14 += MULTIPLY(z2, - FIX(1.467221301)) + /* -(c5+c9) */ |
1525 | MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ | 1525 | MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ |
1526 | MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ | 1526 | MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ |
1527 | 1527 | ||
1528 | /* Final output stage */ | 1528 | /* Final output stage */ |
1529 | 1529 | ||
1530 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 1530 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
1531 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 1531 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
1532 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 1532 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
1533 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 1533 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
1534 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 1534 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
1535 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 1535 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
1536 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 1536 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
1537 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 1537 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
1538 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 1538 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
1539 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 1539 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
1540 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25, CONST_BITS-PASS1_BITS); | 1540 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25, CONST_BITS-PASS1_BITS); |
1541 | } | 1541 | } |
1542 | 1542 | ||
1543 | /* Pass 2: process 11 rows from work array, store into output array. */ | 1543 | /* Pass 2: process 11 rows from work array, store into output array. */ |
1544 | 1544 | ||
1545 | wsptr = workspace; | 1545 | wsptr = workspace; |
1546 | for (ctr = 0; ctr < 11; ctr++) { | 1546 | for (ctr = 0; ctr < 11; ctr++) { |
1547 | outptr = output_buf[ctr] + output_col; | 1547 | outptr = output_buf[ctr] + output_col; |
1548 | 1548 | ||
1549 | /* Even part */ | 1549 | /* Even part */ |
1550 | 1550 | ||
1551 | /* Add fudge factor here for final descale. */ | 1551 | /* Add fudge factor here for final descale. */ |
1552 | tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 1552 | tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
1553 | tmp10 <<= CONST_BITS; | 1553 | tmp10 <<= CONST_BITS; |
1554 | 1554 | ||
1555 | z1 = (INT32) wsptr[2]; | 1555 | z1 = (INT32) wsptr[2]; |
1556 | z2 = (INT32) wsptr[4]; | 1556 | z2 = (INT32) wsptr[4]; |
1557 | z3 = (INT32) wsptr[6]; | 1557 | z3 = (INT32) wsptr[6]; |
1558 | 1558 | ||
1559 | tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ | 1559 | tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ |
1560 | tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ | 1560 | tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ |
1561 | z4 = z1 + z3; | 1561 | z4 = z1 + z3; |
1562 | tmp24 = MULTIPLY(z4, - FIX(1.155664402)); /* -(c2-c10) */ | 1562 | tmp24 = MULTIPLY(z4, - FIX(1.155664402)); /* -(c2-c10) */ |
1563 | z4 -= z2; | 1563 | z4 -= z2; |
1564 | tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ | 1564 | tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ |
1565 | tmp21 = tmp20 + tmp23 + tmp25 - | 1565 | tmp21 = tmp20 + tmp23 + tmp25 - |
1566 | MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ | 1566 | MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ |
1567 | tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ | 1567 | tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ |
1568 | tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ | 1568 | tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ |
1569 | tmp24 += tmp25; | 1569 | tmp24 += tmp25; |
1570 | tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ | 1570 | tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ |
1571 | tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ | 1571 | tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ |
1572 | MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ | 1572 | MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ |
1573 | tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ | 1573 | tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ |
1574 | 1574 | ||
1575 | /* Odd part */ | 1575 | /* Odd part */ |
1576 | 1576 | ||
1577 | z1 = (INT32) wsptr[1]; | 1577 | z1 = (INT32) wsptr[1]; |
1578 | z2 = (INT32) wsptr[3]; | 1578 | z2 = (INT32) wsptr[3]; |
1579 | z3 = (INT32) wsptr[5]; | 1579 | z3 = (INT32) wsptr[5]; |
1580 | z4 = (INT32) wsptr[7]; | 1580 | z4 = (INT32) wsptr[7]; |
1581 | 1581 | ||
1582 | tmp11 = z1 + z2; | 1582 | tmp11 = z1 + z2; |
1583 | tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ | 1583 | tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ |
1584 | tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ | 1584 | tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ |
1585 | tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ | 1585 | tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ |
1586 | tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ | 1586 | tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ |
1587 | tmp10 = tmp11 + tmp12 + tmp13 - | 1587 | tmp10 = tmp11 + tmp12 + tmp13 - |
1588 | MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ | 1588 | MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ |
1589 | z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ | 1589 | z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ |
1590 | tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ | 1590 | tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ |
1591 | tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ | 1591 | tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ |
1592 | z1 = MULTIPLY(z2 + z4, - FIX(1.798248910)); /* -(c1+c9) */ | 1592 | z1 = MULTIPLY(z2 + z4, - FIX(1.798248910)); /* -(c1+c9) */ |
1593 | tmp11 += z1; | 1593 | tmp11 += z1; |
1594 | tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ | 1594 | tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ |
1595 | tmp14 += MULTIPLY(z2, - FIX(1.467221301)) + /* -(c5+c9) */ | 1595 | tmp14 += MULTIPLY(z2, - FIX(1.467221301)) + /* -(c5+c9) */ |
1596 | MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ | 1596 | MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ |
1597 | MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ | 1597 | MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ |
1598 | 1598 | ||
1599 | /* Final output stage */ | 1599 | /* Final output stage */ |
1600 | 1600 | ||
1601 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 1601 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
1602 | CONST_BITS+PASS1_BITS+3) | 1602 | CONST_BITS+PASS1_BITS+3) |
1603 | & RANGE_MASK]; | 1603 | & RANGE_MASK]; |
1604 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 1604 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
1605 | CONST_BITS+PASS1_BITS+3) | 1605 | CONST_BITS+PASS1_BITS+3) |
1606 | & RANGE_MASK]; | 1606 | & RANGE_MASK]; |
1607 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 1607 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
1608 | CONST_BITS+PASS1_BITS+3) | 1608 | CONST_BITS+PASS1_BITS+3) |
1609 | & RANGE_MASK]; | 1609 | & RANGE_MASK]; |
1610 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 1610 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
1611 | CONST_BITS+PASS1_BITS+3) | 1611 | CONST_BITS+PASS1_BITS+3) |
1612 | & RANGE_MASK]; | 1612 | & RANGE_MASK]; |
1613 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 1613 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
1614 | CONST_BITS+PASS1_BITS+3) | 1614 | CONST_BITS+PASS1_BITS+3) |
1615 | & RANGE_MASK]; | 1615 | & RANGE_MASK]; |
1616 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 1616 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
1617 | CONST_BITS+PASS1_BITS+3) | 1617 | CONST_BITS+PASS1_BITS+3) |
1618 | & RANGE_MASK]; | 1618 | & RANGE_MASK]; |
1619 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 1619 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
1620 | CONST_BITS+PASS1_BITS+3) | 1620 | CONST_BITS+PASS1_BITS+3) |
1621 | & RANGE_MASK]; | 1621 | & RANGE_MASK]; |
1622 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 1622 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
1623 | CONST_BITS+PASS1_BITS+3) | 1623 | CONST_BITS+PASS1_BITS+3) |
1624 | & RANGE_MASK]; | 1624 | & RANGE_MASK]; |
1625 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 1625 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
1626 | CONST_BITS+PASS1_BITS+3) | 1626 | CONST_BITS+PASS1_BITS+3) |
1627 | & RANGE_MASK]; | 1627 | & RANGE_MASK]; |
1628 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 1628 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
1629 | CONST_BITS+PASS1_BITS+3) | 1629 | CONST_BITS+PASS1_BITS+3) |
1630 | & RANGE_MASK]; | 1630 | & RANGE_MASK]; |
1631 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25, | 1631 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25, |
1632 | CONST_BITS+PASS1_BITS+3) | 1632 | CONST_BITS+PASS1_BITS+3) |
1633 | & RANGE_MASK]; | 1633 | & RANGE_MASK]; |
1634 | 1634 | ||
1635 | wsptr += 8; /* advance pointer to next row */ | 1635 | wsptr += 8; /* advance pointer to next row */ |
1636 | } | 1636 | } |
1637 | } | 1637 | } |
1638 | 1638 | ||
1639 | 1639 | ||
1640 | /* | 1640 | /* |
1641 | * Perform dequantization and inverse DCT on one block of coefficients, | 1641 | * Perform dequantization and inverse DCT on one block of coefficients, |
1642 | * producing a 12x12 output block. | 1642 | * producing a 12x12 output block. |
1643 | * | 1643 | * |
1644 | * Optimized algorithm with 15 multiplications in the 1-D kernel. | 1644 | * Optimized algorithm with 15 multiplications in the 1-D kernel. |
1645 | * cK represents sqrt(2) * cos(K*pi/24). | 1645 | * cK represents sqrt(2) * cos(K*pi/24). |
1646 | */ | 1646 | */ |
1647 | 1647 | ||
1648 | GLOBAL(void) | 1648 | GLOBAL(void) |
1649 | jpeg_idct_12x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1649 | jpeg_idct_12x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1650 | JCOEFPTR coef_block, | 1650 | JCOEFPTR coef_block, |
1651 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1651 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1652 | { | 1652 | { |
1653 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; | 1653 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
1654 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; | 1654 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
1655 | INT32 z1, z2, z3, z4; | 1655 | INT32 z1, z2, z3, z4; |
1656 | JCOEFPTR inptr; | 1656 | JCOEFPTR inptr; |
1657 | ISLOW_MULT_TYPE * quantptr; | 1657 | ISLOW_MULT_TYPE * quantptr; |
1658 | int * wsptr; | 1658 | int * wsptr; |
1659 | JSAMPROW outptr; | 1659 | JSAMPROW outptr; |
1660 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1660 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1661 | int ctr; | 1661 | int ctr; |
1662 | int workspace[8*12]; /* buffers data between passes */ | 1662 | int workspace[8*12]; /* buffers data between passes */ |
1663 | SHIFT_TEMPS | 1663 | SHIFT_TEMPS |
1664 | 1664 | ||
1665 | /* Pass 1: process columns from input, store into work array. */ | 1665 | /* Pass 1: process columns from input, store into work array. */ |
1666 | 1666 | ||
1667 | inptr = coef_block; | 1667 | inptr = coef_block; |
1668 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1668 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1669 | wsptr = workspace; | 1669 | wsptr = workspace; |
1670 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 1670 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
1671 | /* Even part */ | 1671 | /* Even part */ |
1672 | 1672 | ||
1673 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 1673 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
1674 | z3 <<= CONST_BITS; | 1674 | z3 <<= CONST_BITS; |
1675 | /* Add fudge factor here for final descale. */ | 1675 | /* Add fudge factor here for final descale. */ |
1676 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); | 1676 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
1677 | 1677 | ||
1678 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 1678 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
1679 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ | 1679 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
1680 | 1680 | ||
1681 | tmp10 = z3 + z4; | 1681 | tmp10 = z3 + z4; |
1682 | tmp11 = z3 - z4; | 1682 | tmp11 = z3 - z4; |
1683 | 1683 | ||
1684 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 1684 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
1685 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ | 1685 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
1686 | z1 <<= CONST_BITS; | 1686 | z1 <<= CONST_BITS; |
1687 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 1687 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
1688 | z2 <<= CONST_BITS; | 1688 | z2 <<= CONST_BITS; |
1689 | 1689 | ||
1690 | tmp12 = z1 - z2; | 1690 | tmp12 = z1 - z2; |
1691 | 1691 | ||
1692 | tmp21 = z3 + tmp12; | 1692 | tmp21 = z3 + tmp12; |
1693 | tmp24 = z3 - tmp12; | 1693 | tmp24 = z3 - tmp12; |
1694 | 1694 | ||
1695 | tmp12 = z4 + z2; | 1695 | tmp12 = z4 + z2; |
1696 | 1696 | ||
1697 | tmp20 = tmp10 + tmp12; | 1697 | tmp20 = tmp10 + tmp12; |
1698 | tmp25 = tmp10 - tmp12; | 1698 | tmp25 = tmp10 - tmp12; |
1699 | 1699 | ||
1700 | tmp12 = z4 - z1 - z2; | 1700 | tmp12 = z4 - z1 - z2; |
1701 | 1701 | ||
1702 | tmp22 = tmp11 + tmp12; | 1702 | tmp22 = tmp11 + tmp12; |
1703 | tmp23 = tmp11 - tmp12; | 1703 | tmp23 = tmp11 - tmp12; |
1704 | 1704 | ||
1705 | /* Odd part */ | 1705 | /* Odd part */ |
1706 | 1706 | ||
1707 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 1707 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
1708 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 1708 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
1709 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 1709 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
1710 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 1710 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
1711 | 1711 | ||
1712 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ | 1712 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
1713 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ | 1713 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
1714 | 1714 | ||
1715 | tmp10 = z1 + z3; | 1715 | tmp10 = z1 + z3; |
1716 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ | 1716 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
1717 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ | 1717 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
1718 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ | 1718 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
1719 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ | 1719 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
1720 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ | 1720 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
1721 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ | 1721 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
1722 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ | 1722 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
1723 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ | 1723 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
1724 | 1724 | ||
1725 | z1 -= z4; | 1725 | z1 -= z4; |
1726 | z2 -= z3; | 1726 | z2 -= z3; |
1727 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ | 1727 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
1728 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ | 1728 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
1729 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ | 1729 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
1730 | 1730 | ||
1731 | /* Final output stage */ | 1731 | /* Final output stage */ |
1732 | 1732 | ||
1733 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 1733 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
1734 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 1734 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
1735 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 1735 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
1736 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 1736 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
1737 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 1737 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
1738 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 1738 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
1739 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 1739 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
1740 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 1740 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
1741 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 1741 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
1742 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 1742 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
1743 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); | 1743 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
1744 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); | 1744 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
1745 | } | 1745 | } |
1746 | 1746 | ||
1747 | /* Pass 2: process 12 rows from work array, store into output array. */ | 1747 | /* Pass 2: process 12 rows from work array, store into output array. */ |
1748 | 1748 | ||
1749 | wsptr = workspace; | 1749 | wsptr = workspace; |
1750 | for (ctr = 0; ctr < 12; ctr++) { | 1750 | for (ctr = 0; ctr < 12; ctr++) { |
1751 | outptr = output_buf[ctr] + output_col; | 1751 | outptr = output_buf[ctr] + output_col; |
1752 | 1752 | ||
1753 | /* Even part */ | 1753 | /* Even part */ |
1754 | 1754 | ||
1755 | /* Add fudge factor here for final descale. */ | 1755 | /* Add fudge factor here for final descale. */ |
1756 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 1756 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
1757 | z3 <<= CONST_BITS; | 1757 | z3 <<= CONST_BITS; |
1758 | 1758 | ||
1759 | z4 = (INT32) wsptr[4]; | 1759 | z4 = (INT32) wsptr[4]; |
1760 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ | 1760 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
1761 | 1761 | ||
1762 | tmp10 = z3 + z4; | 1762 | tmp10 = z3 + z4; |
1763 | tmp11 = z3 - z4; | 1763 | tmp11 = z3 - z4; |
1764 | 1764 | ||
1765 | z1 = (INT32) wsptr[2]; | 1765 | z1 = (INT32) wsptr[2]; |
1766 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ | 1766 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
1767 | z1 <<= CONST_BITS; | 1767 | z1 <<= CONST_BITS; |
1768 | z2 = (INT32) wsptr[6]; | 1768 | z2 = (INT32) wsptr[6]; |
1769 | z2 <<= CONST_BITS; | 1769 | z2 <<= CONST_BITS; |
1770 | 1770 | ||
1771 | tmp12 = z1 - z2; | 1771 | tmp12 = z1 - z2; |
1772 | 1772 | ||
1773 | tmp21 = z3 + tmp12; | 1773 | tmp21 = z3 + tmp12; |
1774 | tmp24 = z3 - tmp12; | 1774 | tmp24 = z3 - tmp12; |
1775 | 1775 | ||
1776 | tmp12 = z4 + z2; | 1776 | tmp12 = z4 + z2; |
1777 | 1777 | ||
1778 | tmp20 = tmp10 + tmp12; | 1778 | tmp20 = tmp10 + tmp12; |
1779 | tmp25 = tmp10 - tmp12; | 1779 | tmp25 = tmp10 - tmp12; |
1780 | 1780 | ||
1781 | tmp12 = z4 - z1 - z2; | 1781 | tmp12 = z4 - z1 - z2; |
1782 | 1782 | ||
1783 | tmp22 = tmp11 + tmp12; | 1783 | tmp22 = tmp11 + tmp12; |
1784 | tmp23 = tmp11 - tmp12; | 1784 | tmp23 = tmp11 - tmp12; |
1785 | 1785 | ||
1786 | /* Odd part */ | 1786 | /* Odd part */ |
1787 | 1787 | ||
1788 | z1 = (INT32) wsptr[1]; | 1788 | z1 = (INT32) wsptr[1]; |
1789 | z2 = (INT32) wsptr[3]; | 1789 | z2 = (INT32) wsptr[3]; |
1790 | z3 = (INT32) wsptr[5]; | 1790 | z3 = (INT32) wsptr[5]; |
1791 | z4 = (INT32) wsptr[7]; | 1791 | z4 = (INT32) wsptr[7]; |
1792 | 1792 | ||
1793 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ | 1793 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
1794 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ | 1794 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
1795 | 1795 | ||
1796 | tmp10 = z1 + z3; | 1796 | tmp10 = z1 + z3; |
1797 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ | 1797 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
1798 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ | 1798 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
1799 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ | 1799 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
1800 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ | 1800 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
1801 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ | 1801 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
1802 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ | 1802 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
1803 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ | 1803 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
1804 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ | 1804 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
1805 | 1805 | ||
1806 | z1 -= z4; | 1806 | z1 -= z4; |
1807 | z2 -= z3; | 1807 | z2 -= z3; |
1808 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ | 1808 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
1809 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ | 1809 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
1810 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ | 1810 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
1811 | 1811 | ||
1812 | /* Final output stage */ | 1812 | /* Final output stage */ |
1813 | 1813 | ||
1814 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 1814 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
1815 | CONST_BITS+PASS1_BITS+3) | 1815 | CONST_BITS+PASS1_BITS+3) |
1816 | & RANGE_MASK]; | 1816 | & RANGE_MASK]; |
1817 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 1817 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
1818 | CONST_BITS+PASS1_BITS+3) | 1818 | CONST_BITS+PASS1_BITS+3) |
1819 | & RANGE_MASK]; | 1819 | & RANGE_MASK]; |
1820 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 1820 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
1821 | CONST_BITS+PASS1_BITS+3) | 1821 | CONST_BITS+PASS1_BITS+3) |
1822 | & RANGE_MASK]; | 1822 | & RANGE_MASK]; |
1823 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 1823 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
1824 | CONST_BITS+PASS1_BITS+3) | 1824 | CONST_BITS+PASS1_BITS+3) |
1825 | & RANGE_MASK]; | 1825 | & RANGE_MASK]; |
1826 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 1826 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
1827 | CONST_BITS+PASS1_BITS+3) | 1827 | CONST_BITS+PASS1_BITS+3) |
1828 | & RANGE_MASK]; | 1828 | & RANGE_MASK]; |
1829 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 1829 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
1830 | CONST_BITS+PASS1_BITS+3) | 1830 | CONST_BITS+PASS1_BITS+3) |
1831 | & RANGE_MASK]; | 1831 | & RANGE_MASK]; |
1832 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 1832 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
1833 | CONST_BITS+PASS1_BITS+3) | 1833 | CONST_BITS+PASS1_BITS+3) |
1834 | & RANGE_MASK]; | 1834 | & RANGE_MASK]; |
1835 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 1835 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
1836 | CONST_BITS+PASS1_BITS+3) | 1836 | CONST_BITS+PASS1_BITS+3) |
1837 | & RANGE_MASK]; | 1837 | & RANGE_MASK]; |
1838 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 1838 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
1839 | CONST_BITS+PASS1_BITS+3) | 1839 | CONST_BITS+PASS1_BITS+3) |
1840 | & RANGE_MASK]; | 1840 | & RANGE_MASK]; |
1841 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 1841 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
1842 | CONST_BITS+PASS1_BITS+3) | 1842 | CONST_BITS+PASS1_BITS+3) |
1843 | & RANGE_MASK]; | 1843 | & RANGE_MASK]; |
1844 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, | 1844 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
1845 | CONST_BITS+PASS1_BITS+3) | 1845 | CONST_BITS+PASS1_BITS+3) |
1846 | & RANGE_MASK]; | 1846 | & RANGE_MASK]; |
1847 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, | 1847 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
1848 | CONST_BITS+PASS1_BITS+3) | 1848 | CONST_BITS+PASS1_BITS+3) |
1849 | & RANGE_MASK]; | 1849 | & RANGE_MASK]; |
1850 | 1850 | ||
1851 | wsptr += 8; /* advance pointer to next row */ | 1851 | wsptr += 8; /* advance pointer to next row */ |
1852 | } | 1852 | } |
1853 | } | 1853 | } |
1854 | 1854 | ||
1855 | 1855 | ||
1856 | /* | 1856 | /* |
1857 | * Perform dequantization and inverse DCT on one block of coefficients, | 1857 | * Perform dequantization and inverse DCT on one block of coefficients, |
1858 | * producing a 13x13 output block. | 1858 | * producing a 13x13 output block. |
1859 | * | 1859 | * |
1860 | * Optimized algorithm with 29 multiplications in the 1-D kernel. | 1860 | * Optimized algorithm with 29 multiplications in the 1-D kernel. |
1861 | * cK represents sqrt(2) * cos(K*pi/26). | 1861 | * cK represents sqrt(2) * cos(K*pi/26). |
1862 | */ | 1862 | */ |
1863 | 1863 | ||
1864 | GLOBAL(void) | 1864 | GLOBAL(void) |
1865 | jpeg_idct_13x13 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 1865 | jpeg_idct_13x13 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
1866 | JCOEFPTR coef_block, | 1866 | JCOEFPTR coef_block, |
1867 | JSAMPARRAY output_buf, JDIMENSION output_col) | 1867 | JSAMPARRAY output_buf, JDIMENSION output_col) |
1868 | { | 1868 | { |
1869 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; | 1869 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
1870 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; | 1870 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
1871 | INT32 z1, z2, z3, z4; | 1871 | INT32 z1, z2, z3, z4; |
1872 | JCOEFPTR inptr; | 1872 | JCOEFPTR inptr; |
1873 | ISLOW_MULT_TYPE * quantptr; | 1873 | ISLOW_MULT_TYPE * quantptr; |
1874 | int * wsptr; | 1874 | int * wsptr; |
1875 | JSAMPROW outptr; | 1875 | JSAMPROW outptr; |
1876 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 1876 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
1877 | int ctr; | 1877 | int ctr; |
1878 | int workspace[8*13]; /* buffers data between passes */ | 1878 | int workspace[8*13]; /* buffers data between passes */ |
1879 | SHIFT_TEMPS | 1879 | SHIFT_TEMPS |
1880 | 1880 | ||
1881 | /* Pass 1: process columns from input, store into work array. */ | 1881 | /* Pass 1: process columns from input, store into work array. */ |
1882 | 1882 | ||
1883 | inptr = coef_block; | 1883 | inptr = coef_block; |
1884 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 1884 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
1885 | wsptr = workspace; | 1885 | wsptr = workspace; |
1886 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 1886 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
1887 | /* Even part */ | 1887 | /* Even part */ |
1888 | 1888 | ||
1889 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 1889 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
1890 | z1 <<= CONST_BITS; | 1890 | z1 <<= CONST_BITS; |
1891 | /* Add fudge factor here for final descale. */ | 1891 | /* Add fudge factor here for final descale. */ |
1892 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); | 1892 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
1893 | 1893 | ||
1894 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 1894 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
1895 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 1895 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
1896 | z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 1896 | z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
1897 | 1897 | ||
1898 | tmp10 = z3 + z4; | 1898 | tmp10 = z3 + z4; |
1899 | tmp11 = z3 - z4; | 1899 | tmp11 = z3 - z4; |
1900 | 1900 | ||
1901 | tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ | 1901 | tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ |
1902 | tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ | 1902 | tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ |
1903 | 1903 | ||
1904 | tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ | 1904 | tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ |
1905 | tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ | 1905 | tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ |
1906 | 1906 | ||
1907 | tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ | 1907 | tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ |
1908 | tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ | 1908 | tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ |
1909 | 1909 | ||
1910 | tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ | 1910 | tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ |
1911 | tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ | 1911 | tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ |
1912 | 1912 | ||
1913 | tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ | 1913 | tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ |
1914 | tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ | 1914 | tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ |
1915 | 1915 | ||
1916 | tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ | 1916 | tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ |
1917 | tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ | 1917 | tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ |
1918 | 1918 | ||
1919 | tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ | 1919 | tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ |
1920 | 1920 | ||
1921 | /* Odd part */ | 1921 | /* Odd part */ |
1922 | 1922 | ||
1923 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 1923 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
1924 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 1924 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
1925 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 1925 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
1926 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 1926 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
1927 | 1927 | ||
1928 | tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ | 1928 | tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ |
1929 | tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ | 1929 | tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ |
1930 | tmp15 = z1 + z4; | 1930 | tmp15 = z1 + z4; |
1931 | tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ | 1931 | tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ |
1932 | tmp10 = tmp11 + tmp12 + tmp13 - | 1932 | tmp10 = tmp11 + tmp12 + tmp13 - |
1933 | MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ | 1933 | MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ |
1934 | tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458)); /* -c11 */ | 1934 | tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458)); /* -c11 */ |
1935 | tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ | 1935 | tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ |
1936 | tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ | 1936 | tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ |
1937 | tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945)); /* -c5 */ | 1937 | tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945)); /* -c5 */ |
1938 | tmp11 += tmp14; | 1938 | tmp11 += tmp14; |
1939 | tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ | 1939 | tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ |
1940 | tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813)); /* -c9 */ | 1940 | tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813)); /* -c9 */ |
1941 | tmp12 += tmp14; | 1941 | tmp12 += tmp14; |
1942 | tmp13 += tmp14; | 1942 | tmp13 += tmp14; |
1943 | tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ | 1943 | tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ |
1944 | tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ | 1944 | tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ |
1945 | MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ | 1945 | MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ |
1946 | z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ | 1946 | z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ |
1947 | tmp14 += z1; | 1947 | tmp14 += z1; |
1948 | tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ | 1948 | tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ |
1949 | MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ | 1949 | MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ |
1950 | 1950 | ||
1951 | /* Final output stage */ | 1951 | /* Final output stage */ |
1952 | 1952 | ||
1953 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 1953 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
1954 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 1954 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
1955 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 1955 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
1956 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 1956 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
1957 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 1957 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
1958 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 1958 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
1959 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 1959 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
1960 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 1960 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
1961 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 1961 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
1962 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 1962 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
1963 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); | 1963 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
1964 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); | 1964 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
1965 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26, CONST_BITS-PASS1_BITS); | 1965 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26, CONST_BITS-PASS1_BITS); |
1966 | } | 1966 | } |
1967 | 1967 | ||
1968 | /* Pass 2: process 13 rows from work array, store into output array. */ | 1968 | /* Pass 2: process 13 rows from work array, store into output array. */ |
1969 | 1969 | ||
1970 | wsptr = workspace; | 1970 | wsptr = workspace; |
1971 | for (ctr = 0; ctr < 13; ctr++) { | 1971 | for (ctr = 0; ctr < 13; ctr++) { |
1972 | outptr = output_buf[ctr] + output_col; | 1972 | outptr = output_buf[ctr] + output_col; |
1973 | 1973 | ||
1974 | /* Even part */ | 1974 | /* Even part */ |
1975 | 1975 | ||
1976 | /* Add fudge factor here for final descale. */ | 1976 | /* Add fudge factor here for final descale. */ |
1977 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 1977 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
1978 | z1 <<= CONST_BITS; | 1978 | z1 <<= CONST_BITS; |
1979 | 1979 | ||
1980 | z2 = (INT32) wsptr[2]; | 1980 | z2 = (INT32) wsptr[2]; |
1981 | z3 = (INT32) wsptr[4]; | 1981 | z3 = (INT32) wsptr[4]; |
1982 | z4 = (INT32) wsptr[6]; | 1982 | z4 = (INT32) wsptr[6]; |
1983 | 1983 | ||
1984 | tmp10 = z3 + z4; | 1984 | tmp10 = z3 + z4; |
1985 | tmp11 = z3 - z4; | 1985 | tmp11 = z3 - z4; |
1986 | 1986 | ||
1987 | tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ | 1987 | tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ |
1988 | tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ | 1988 | tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ |
1989 | 1989 | ||
1990 | tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ | 1990 | tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ |
1991 | tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ | 1991 | tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ |
1992 | 1992 | ||
1993 | tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ | 1993 | tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ |
1994 | tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ | 1994 | tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ |
1995 | 1995 | ||
1996 | tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ | 1996 | tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ |
1997 | tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ | 1997 | tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ |
1998 | 1998 | ||
1999 | tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ | 1999 | tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ |
2000 | tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ | 2000 | tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ |
2001 | 2001 | ||
2002 | tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ | 2002 | tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ |
2003 | tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ | 2003 | tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ |
2004 | 2004 | ||
2005 | tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ | 2005 | tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ |
2006 | 2006 | ||
2007 | /* Odd part */ | 2007 | /* Odd part */ |
2008 | 2008 | ||
2009 | z1 = (INT32) wsptr[1]; | 2009 | z1 = (INT32) wsptr[1]; |
2010 | z2 = (INT32) wsptr[3]; | 2010 | z2 = (INT32) wsptr[3]; |
2011 | z3 = (INT32) wsptr[5]; | 2011 | z3 = (INT32) wsptr[5]; |
2012 | z4 = (INT32) wsptr[7]; | 2012 | z4 = (INT32) wsptr[7]; |
2013 | 2013 | ||
2014 | tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ | 2014 | tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ |
2015 | tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ | 2015 | tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ |
2016 | tmp15 = z1 + z4; | 2016 | tmp15 = z1 + z4; |
2017 | tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ | 2017 | tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ |
2018 | tmp10 = tmp11 + tmp12 + tmp13 - | 2018 | tmp10 = tmp11 + tmp12 + tmp13 - |
2019 | MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ | 2019 | MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ |
2020 | tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458)); /* -c11 */ | 2020 | tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458)); /* -c11 */ |
2021 | tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ | 2021 | tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ |
2022 | tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ | 2022 | tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ |
2023 | tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945)); /* -c5 */ | 2023 | tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945)); /* -c5 */ |
2024 | tmp11 += tmp14; | 2024 | tmp11 += tmp14; |
2025 | tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ | 2025 | tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ |
2026 | tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813)); /* -c9 */ | 2026 | tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813)); /* -c9 */ |
2027 | tmp12 += tmp14; | 2027 | tmp12 += tmp14; |
2028 | tmp13 += tmp14; | 2028 | tmp13 += tmp14; |
2029 | tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ | 2029 | tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ |
2030 | tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ | 2030 | tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ |
2031 | MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ | 2031 | MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ |
2032 | z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ | 2032 | z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ |
2033 | tmp14 += z1; | 2033 | tmp14 += z1; |
2034 | tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ | 2034 | tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ |
2035 | MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ | 2035 | MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ |
2036 | 2036 | ||
2037 | /* Final output stage */ | 2037 | /* Final output stage */ |
2038 | 2038 | ||
2039 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 2039 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
2040 | CONST_BITS+PASS1_BITS+3) | 2040 | CONST_BITS+PASS1_BITS+3) |
2041 | & RANGE_MASK]; | 2041 | & RANGE_MASK]; |
2042 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 2042 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
2043 | CONST_BITS+PASS1_BITS+3) | 2043 | CONST_BITS+PASS1_BITS+3) |
2044 | & RANGE_MASK]; | 2044 | & RANGE_MASK]; |
2045 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 2045 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
2046 | CONST_BITS+PASS1_BITS+3) | 2046 | CONST_BITS+PASS1_BITS+3) |
2047 | & RANGE_MASK]; | 2047 | & RANGE_MASK]; |
2048 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 2048 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
2049 | CONST_BITS+PASS1_BITS+3) | 2049 | CONST_BITS+PASS1_BITS+3) |
2050 | & RANGE_MASK]; | 2050 | & RANGE_MASK]; |
2051 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 2051 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
2052 | CONST_BITS+PASS1_BITS+3) | 2052 | CONST_BITS+PASS1_BITS+3) |
2053 | & RANGE_MASK]; | 2053 | & RANGE_MASK]; |
2054 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 2054 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
2055 | CONST_BITS+PASS1_BITS+3) | 2055 | CONST_BITS+PASS1_BITS+3) |
2056 | & RANGE_MASK]; | 2056 | & RANGE_MASK]; |
2057 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 2057 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
2058 | CONST_BITS+PASS1_BITS+3) | 2058 | CONST_BITS+PASS1_BITS+3) |
2059 | & RANGE_MASK]; | 2059 | & RANGE_MASK]; |
2060 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 2060 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
2061 | CONST_BITS+PASS1_BITS+3) | 2061 | CONST_BITS+PASS1_BITS+3) |
2062 | & RANGE_MASK]; | 2062 | & RANGE_MASK]; |
2063 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 2063 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
2064 | CONST_BITS+PASS1_BITS+3) | 2064 | CONST_BITS+PASS1_BITS+3) |
2065 | & RANGE_MASK]; | 2065 | & RANGE_MASK]; |
2066 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 2066 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
2067 | CONST_BITS+PASS1_BITS+3) | 2067 | CONST_BITS+PASS1_BITS+3) |
2068 | & RANGE_MASK]; | 2068 | & RANGE_MASK]; |
2069 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, | 2069 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
2070 | CONST_BITS+PASS1_BITS+3) | 2070 | CONST_BITS+PASS1_BITS+3) |
2071 | & RANGE_MASK]; | 2071 | & RANGE_MASK]; |
2072 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, | 2072 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
2073 | CONST_BITS+PASS1_BITS+3) | 2073 | CONST_BITS+PASS1_BITS+3) |
2074 | & RANGE_MASK]; | 2074 | & RANGE_MASK]; |
2075 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26, | 2075 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26, |
2076 | CONST_BITS+PASS1_BITS+3) | 2076 | CONST_BITS+PASS1_BITS+3) |
2077 | & RANGE_MASK]; | 2077 | & RANGE_MASK]; |
2078 | 2078 | ||
2079 | wsptr += 8; /* advance pointer to next row */ | 2079 | wsptr += 8; /* advance pointer to next row */ |
2080 | } | 2080 | } |
2081 | } | 2081 | } |
2082 | 2082 | ||
2083 | 2083 | ||
2084 | /* | 2084 | /* |
2085 | * Perform dequantization and inverse DCT on one block of coefficients, | 2085 | * Perform dequantization and inverse DCT on one block of coefficients, |
2086 | * producing a 14x14 output block. | 2086 | * producing a 14x14 output block. |
2087 | * | 2087 | * |
2088 | * Optimized algorithm with 20 multiplications in the 1-D kernel. | 2088 | * Optimized algorithm with 20 multiplications in the 1-D kernel. |
2089 | * cK represents sqrt(2) * cos(K*pi/28). | 2089 | * cK represents sqrt(2) * cos(K*pi/28). |
2090 | */ | 2090 | */ |
2091 | 2091 | ||
2092 | GLOBAL(void) | 2092 | GLOBAL(void) |
2093 | jpeg_idct_14x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 2093 | jpeg_idct_14x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
2094 | JCOEFPTR coef_block, | 2094 | JCOEFPTR coef_block, |
2095 | JSAMPARRAY output_buf, JDIMENSION output_col) | 2095 | JSAMPARRAY output_buf, JDIMENSION output_col) |
2096 | { | 2096 | { |
2097 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; | 2097 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
2098 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; | 2098 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
2099 | INT32 z1, z2, z3, z4; | 2099 | INT32 z1, z2, z3, z4; |
2100 | JCOEFPTR inptr; | 2100 | JCOEFPTR inptr; |
2101 | ISLOW_MULT_TYPE * quantptr; | 2101 | ISLOW_MULT_TYPE * quantptr; |
2102 | int * wsptr; | 2102 | int * wsptr; |
2103 | JSAMPROW outptr; | 2103 | JSAMPROW outptr; |
2104 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 2104 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
2105 | int ctr; | 2105 | int ctr; |
2106 | int workspace[8*14]; /* buffers data between passes */ | 2106 | int workspace[8*14]; /* buffers data between passes */ |
2107 | SHIFT_TEMPS | 2107 | SHIFT_TEMPS |
2108 | 2108 | ||
2109 | /* Pass 1: process columns from input, store into work array. */ | 2109 | /* Pass 1: process columns from input, store into work array. */ |
2110 | 2110 | ||
2111 | inptr = coef_block; | 2111 | inptr = coef_block; |
2112 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 2112 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
2113 | wsptr = workspace; | 2113 | wsptr = workspace; |
2114 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 2114 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
2115 | /* Even part */ | 2115 | /* Even part */ |
2116 | 2116 | ||
2117 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 2117 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
2118 | z1 <<= CONST_BITS; | 2118 | z1 <<= CONST_BITS; |
2119 | /* Add fudge factor here for final descale. */ | 2119 | /* Add fudge factor here for final descale. */ |
2120 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); | 2120 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
2121 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 2121 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
2122 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ | 2122 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
2123 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ | 2123 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
2124 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ | 2124 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
2125 | 2125 | ||
2126 | tmp10 = z1 + z2; | 2126 | tmp10 = z1 + z2; |
2127 | tmp11 = z1 + z3; | 2127 | tmp11 = z1 + z3; |
2128 | tmp12 = z1 - z4; | 2128 | tmp12 = z1 - z4; |
2129 | 2129 | ||
2130 | tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */ | 2130 | tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */ |
2131 | CONST_BITS-PASS1_BITS); | 2131 | CONST_BITS-PASS1_BITS); |
2132 | 2132 | ||
2133 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 2133 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
2134 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 2134 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
2135 | 2135 | ||
2136 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ | 2136 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
2137 | 2137 | ||
2138 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ | 2138 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
2139 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ | 2139 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
2140 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ | 2140 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
2141 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ | 2141 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
2142 | 2142 | ||
2143 | tmp20 = tmp10 + tmp13; | 2143 | tmp20 = tmp10 + tmp13; |
2144 | tmp26 = tmp10 - tmp13; | 2144 | tmp26 = tmp10 - tmp13; |
2145 | tmp21 = tmp11 + tmp14; | 2145 | tmp21 = tmp11 + tmp14; |
2146 | tmp25 = tmp11 - tmp14; | 2146 | tmp25 = tmp11 - tmp14; |
2147 | tmp22 = tmp12 + tmp15; | 2147 | tmp22 = tmp12 + tmp15; |
2148 | tmp24 = tmp12 - tmp15; | 2148 | tmp24 = tmp12 - tmp15; |
2149 | 2149 | ||
2150 | /* Odd part */ | 2150 | /* Odd part */ |
2151 | 2151 | ||
2152 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 2152 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
2153 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 2153 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
2154 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 2154 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
2155 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 2155 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
2156 | tmp13 = z4 << CONST_BITS; | 2156 | tmp13 = z4 << CONST_BITS; |
2157 | 2157 | ||
2158 | tmp14 = z1 + z3; | 2158 | tmp14 = z1 + z3; |
2159 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ | 2159 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
2160 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ | 2160 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
2161 | tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ | 2161 | tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
2162 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ | 2162 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
2163 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ | 2163 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
2164 | z1 -= z2; | 2164 | z1 -= z2; |
2165 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ | 2165 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ |
2166 | tmp16 += tmp15; | 2166 | tmp16 += tmp15; |
2167 | z1 += z4; | 2167 | z1 += z4; |
2168 | z4 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */ | 2168 | z4 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */ |
2169 | tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ | 2169 | tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
2170 | tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ | 2170 | tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
2171 | z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ | 2171 | z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
2172 | tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ | 2172 | tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
2173 | tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ | 2173 | tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
2174 | 2174 | ||
2175 | tmp13 = (z1 - z3) << PASS1_BITS; | 2175 | tmp13 = (z1 - z3) << PASS1_BITS; |
2176 | 2176 | ||
2177 | /* Final output stage */ | 2177 | /* Final output stage */ |
2178 | 2178 | ||
2179 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 2179 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
2180 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 2180 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
2181 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 2181 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
2182 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 2182 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
2183 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 2183 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
2184 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 2184 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
2185 | wsptr[8*3] = (int) (tmp23 + tmp13); | 2185 | wsptr[8*3] = (int) (tmp23 + tmp13); |
2186 | wsptr[8*10] = (int) (tmp23 - tmp13); | 2186 | wsptr[8*10] = (int) (tmp23 - tmp13); |
2187 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 2187 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
2188 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 2188 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
2189 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); | 2189 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
2190 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); | 2190 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
2191 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); | 2191 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); |
2192 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); | 2192 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); |
2193 | } | 2193 | } |
2194 | 2194 | ||
2195 | /* Pass 2: process 14 rows from work array, store into output array. */ | 2195 | /* Pass 2: process 14 rows from work array, store into output array. */ |
2196 | 2196 | ||
2197 | wsptr = workspace; | 2197 | wsptr = workspace; |
2198 | for (ctr = 0; ctr < 14; ctr++) { | 2198 | for (ctr = 0; ctr < 14; ctr++) { |
2199 | outptr = output_buf[ctr] + output_col; | 2199 | outptr = output_buf[ctr] + output_col; |
2200 | 2200 | ||
2201 | /* Even part */ | 2201 | /* Even part */ |
2202 | 2202 | ||
2203 | /* Add fudge factor here for final descale. */ | 2203 | /* Add fudge factor here for final descale. */ |
2204 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 2204 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
2205 | z1 <<= CONST_BITS; | 2205 | z1 <<= CONST_BITS; |
2206 | z4 = (INT32) wsptr[4]; | 2206 | z4 = (INT32) wsptr[4]; |
2207 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ | 2207 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
2208 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ | 2208 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
2209 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ | 2209 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
2210 | 2210 | ||
2211 | tmp10 = z1 + z2; | 2211 | tmp10 = z1 + z2; |
2212 | tmp11 = z1 + z3; | 2212 | tmp11 = z1 + z3; |
2213 | tmp12 = z1 - z4; | 2213 | tmp12 = z1 - z4; |
2214 | 2214 | ||
2215 | tmp23 = z1 - ((z2 + z3 - z4) << 1); /* c0 = (c4+c12-c8)*2 */ | 2215 | tmp23 = z1 - ((z2 + z3 - z4) << 1); /* c0 = (c4+c12-c8)*2 */ |
2216 | 2216 | ||
2217 | z1 = (INT32) wsptr[2]; | 2217 | z1 = (INT32) wsptr[2]; |
2218 | z2 = (INT32) wsptr[6]; | 2218 | z2 = (INT32) wsptr[6]; |
2219 | 2219 | ||
2220 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ | 2220 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
2221 | 2221 | ||
2222 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ | 2222 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
2223 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ | 2223 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
2224 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ | 2224 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
2225 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ | 2225 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
2226 | 2226 | ||
2227 | tmp20 = tmp10 + tmp13; | 2227 | tmp20 = tmp10 + tmp13; |
2228 | tmp26 = tmp10 - tmp13; | 2228 | tmp26 = tmp10 - tmp13; |
2229 | tmp21 = tmp11 + tmp14; | 2229 | tmp21 = tmp11 + tmp14; |
2230 | tmp25 = tmp11 - tmp14; | 2230 | tmp25 = tmp11 - tmp14; |
2231 | tmp22 = tmp12 + tmp15; | 2231 | tmp22 = tmp12 + tmp15; |
2232 | tmp24 = tmp12 - tmp15; | 2232 | tmp24 = tmp12 - tmp15; |
2233 | 2233 | ||
2234 | /* Odd part */ | 2234 | /* Odd part */ |
2235 | 2235 | ||
2236 | z1 = (INT32) wsptr[1]; | 2236 | z1 = (INT32) wsptr[1]; |
2237 | z2 = (INT32) wsptr[3]; | 2237 | z2 = (INT32) wsptr[3]; |
2238 | z3 = (INT32) wsptr[5]; | 2238 | z3 = (INT32) wsptr[5]; |
2239 | z4 = (INT32) wsptr[7]; | 2239 | z4 = (INT32) wsptr[7]; |
2240 | z4 <<= CONST_BITS; | 2240 | z4 <<= CONST_BITS; |
2241 | 2241 | ||
2242 | tmp14 = z1 + z3; | 2242 | tmp14 = z1 + z3; |
2243 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ | 2243 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
2244 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ | 2244 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
2245 | tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ | 2245 | tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
2246 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ | 2246 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
2247 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ | 2247 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
2248 | z1 -= z2; | 2248 | z1 -= z2; |
2249 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ | 2249 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ |
2250 | tmp16 += tmp15; | 2250 | tmp16 += tmp15; |
2251 | tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4; /* -c13 */ | 2251 | tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4; /* -c13 */ |
2252 | tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ | 2252 | tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
2253 | tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ | 2253 | tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
2254 | tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ | 2254 | tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
2255 | tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ | 2255 | tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
2256 | tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ | 2256 | tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
2257 | 2257 | ||
2258 | tmp13 = ((z1 - z3) << CONST_BITS) + z4; | 2258 | tmp13 = ((z1 - z3) << CONST_BITS) + z4; |
2259 | 2259 | ||
2260 | /* Final output stage */ | 2260 | /* Final output stage */ |
2261 | 2261 | ||
2262 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 2262 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
2263 | CONST_BITS+PASS1_BITS+3) | 2263 | CONST_BITS+PASS1_BITS+3) |
2264 | & RANGE_MASK]; | 2264 | & RANGE_MASK]; |
2265 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 2265 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
2266 | CONST_BITS+PASS1_BITS+3) | 2266 | CONST_BITS+PASS1_BITS+3) |
2267 | & RANGE_MASK]; | 2267 | & RANGE_MASK]; |
2268 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 2268 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
2269 | CONST_BITS+PASS1_BITS+3) | 2269 | CONST_BITS+PASS1_BITS+3) |
2270 | & RANGE_MASK]; | 2270 | & RANGE_MASK]; |
2271 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 2271 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
2272 | CONST_BITS+PASS1_BITS+3) | 2272 | CONST_BITS+PASS1_BITS+3) |
2273 | & RANGE_MASK]; | 2273 | & RANGE_MASK]; |
2274 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 2274 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
2275 | CONST_BITS+PASS1_BITS+3) | 2275 | CONST_BITS+PASS1_BITS+3) |
2276 | & RANGE_MASK]; | 2276 | & RANGE_MASK]; |
2277 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 2277 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
2278 | CONST_BITS+PASS1_BITS+3) | 2278 | CONST_BITS+PASS1_BITS+3) |
2279 | & RANGE_MASK]; | 2279 | & RANGE_MASK]; |
2280 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 2280 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
2281 | CONST_BITS+PASS1_BITS+3) | 2281 | CONST_BITS+PASS1_BITS+3) |
2282 | & RANGE_MASK]; | 2282 | & RANGE_MASK]; |
2283 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 2283 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
2284 | CONST_BITS+PASS1_BITS+3) | 2284 | CONST_BITS+PASS1_BITS+3) |
2285 | & RANGE_MASK]; | 2285 | & RANGE_MASK]; |
2286 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 2286 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
2287 | CONST_BITS+PASS1_BITS+3) | 2287 | CONST_BITS+PASS1_BITS+3) |
2288 | & RANGE_MASK]; | 2288 | & RANGE_MASK]; |
2289 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 2289 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
2290 | CONST_BITS+PASS1_BITS+3) | 2290 | CONST_BITS+PASS1_BITS+3) |
2291 | & RANGE_MASK]; | 2291 | & RANGE_MASK]; |
2292 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, | 2292 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
2293 | CONST_BITS+PASS1_BITS+3) | 2293 | CONST_BITS+PASS1_BITS+3) |
2294 | & RANGE_MASK]; | 2294 | & RANGE_MASK]; |
2295 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, | 2295 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
2296 | CONST_BITS+PASS1_BITS+3) | 2296 | CONST_BITS+PASS1_BITS+3) |
2297 | & RANGE_MASK]; | 2297 | & RANGE_MASK]; |
2298 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, | 2298 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, |
2299 | CONST_BITS+PASS1_BITS+3) | 2299 | CONST_BITS+PASS1_BITS+3) |
2300 | & RANGE_MASK]; | 2300 | & RANGE_MASK]; |
2301 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, | 2301 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, |
2302 | CONST_BITS+PASS1_BITS+3) | 2302 | CONST_BITS+PASS1_BITS+3) |
2303 | & RANGE_MASK]; | 2303 | & RANGE_MASK]; |
2304 | 2304 | ||
2305 | wsptr += 8; /* advance pointer to next row */ | 2305 | wsptr += 8; /* advance pointer to next row */ |
2306 | } | 2306 | } |
2307 | } | 2307 | } |
2308 | 2308 | ||
2309 | 2309 | ||
2310 | /* | 2310 | /* |
2311 | * Perform dequantization and inverse DCT on one block of coefficients, | 2311 | * Perform dequantization and inverse DCT on one block of coefficients, |
2312 | * producing a 15x15 output block. | 2312 | * producing a 15x15 output block. |
2313 | * | 2313 | * |
2314 | * Optimized algorithm with 22 multiplications in the 1-D kernel. | 2314 | * Optimized algorithm with 22 multiplications in the 1-D kernel. |
2315 | * cK represents sqrt(2) * cos(K*pi/30). | 2315 | * cK represents sqrt(2) * cos(K*pi/30). |
2316 | */ | 2316 | */ |
2317 | 2317 | ||
2318 | GLOBAL(void) | 2318 | GLOBAL(void) |
2319 | jpeg_idct_15x15 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 2319 | jpeg_idct_15x15 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
2320 | JCOEFPTR coef_block, | 2320 | JCOEFPTR coef_block, |
2321 | JSAMPARRAY output_buf, JDIMENSION output_col) | 2321 | JSAMPARRAY output_buf, JDIMENSION output_col) |
2322 | { | 2322 | { |
2323 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; | 2323 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
2324 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; | 2324 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
2325 | INT32 z1, z2, z3, z4; | 2325 | INT32 z1, z2, z3, z4; |
2326 | JCOEFPTR inptr; | 2326 | JCOEFPTR inptr; |
2327 | ISLOW_MULT_TYPE * quantptr; | 2327 | ISLOW_MULT_TYPE * quantptr; |
2328 | int * wsptr; | 2328 | int * wsptr; |
2329 | JSAMPROW outptr; | 2329 | JSAMPROW outptr; |
2330 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 2330 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
2331 | int ctr; | 2331 | int ctr; |
2332 | int workspace[8*15]; /* buffers data between passes */ | 2332 | int workspace[8*15]; /* buffers data between passes */ |
2333 | SHIFT_TEMPS | 2333 | SHIFT_TEMPS |
2334 | 2334 | ||
2335 | /* Pass 1: process columns from input, store into work array. */ | 2335 | /* Pass 1: process columns from input, store into work array. */ |
2336 | 2336 | ||
2337 | inptr = coef_block; | 2337 | inptr = coef_block; |
2338 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 2338 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
2339 | wsptr = workspace; | 2339 | wsptr = workspace; |
2340 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 2340 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
2341 | /* Even part */ | 2341 | /* Even part */ |
2342 | 2342 | ||
2343 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 2343 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
2344 | z1 <<= CONST_BITS; | 2344 | z1 <<= CONST_BITS; |
2345 | /* Add fudge factor here for final descale. */ | 2345 | /* Add fudge factor here for final descale. */ |
2346 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); | 2346 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
2347 | 2347 | ||
2348 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 2348 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
2349 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 2349 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
2350 | z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 2350 | z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
2351 | 2351 | ||
2352 | tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ | 2352 | tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ |
2353 | tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ | 2353 | tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ |
2354 | 2354 | ||
2355 | tmp12 = z1 - tmp10; | 2355 | tmp12 = z1 - tmp10; |
2356 | tmp13 = z1 + tmp11; | 2356 | tmp13 = z1 + tmp11; |
2357 | z1 -= (tmp11 - tmp10) << 1; /* c0 = (c6-c12)*2 */ | 2357 | z1 -= (tmp11 - tmp10) << 1; /* c0 = (c6-c12)*2 */ |
2358 | 2358 | ||
2359 | z4 = z2 - z3; | 2359 | z4 = z2 - z3; |
2360 | z3 += z2; | 2360 | z3 += z2; |
2361 | tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ | 2361 | tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ |
2362 | tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ | 2362 | tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ |
2363 | z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ | 2363 | z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ |
2364 | 2364 | ||
2365 | tmp20 = tmp13 + tmp10 + tmp11; | 2365 | tmp20 = tmp13 + tmp10 + tmp11; |
2366 | tmp23 = tmp12 - tmp10 + tmp11 + z2; | 2366 | tmp23 = tmp12 - tmp10 + tmp11 + z2; |
2367 | 2367 | ||
2368 | tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ | 2368 | tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ |
2369 | tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ | 2369 | tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ |
2370 | 2370 | ||
2371 | tmp25 = tmp13 - tmp10 - tmp11; | 2371 | tmp25 = tmp13 - tmp10 - tmp11; |
2372 | tmp26 = tmp12 + tmp10 - tmp11 - z2; | 2372 | tmp26 = tmp12 + tmp10 - tmp11 - z2; |
2373 | 2373 | ||
2374 | tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ | 2374 | tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ |
2375 | tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ | 2375 | tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ |
2376 | 2376 | ||
2377 | tmp21 = tmp12 + tmp10 + tmp11; | 2377 | tmp21 = tmp12 + tmp10 + tmp11; |
2378 | tmp24 = tmp13 - tmp10 + tmp11; | 2378 | tmp24 = tmp13 - tmp10 + tmp11; |
2379 | tmp11 += tmp11; | 2379 | tmp11 += tmp11; |
2380 | tmp22 = z1 + tmp11; /* c10 = c6-c12 */ | 2380 | tmp22 = z1 + tmp11; /* c10 = c6-c12 */ |
2381 | tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ | 2381 | tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ |
2382 | 2382 | ||
2383 | /* Odd part */ | 2383 | /* Odd part */ |
2384 | 2384 | ||
2385 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 2385 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
2386 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 2386 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
2387 | z4 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 2387 | z4 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
2388 | z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ | 2388 | z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ |
2389 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 2389 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
2390 | 2390 | ||
2391 | tmp13 = z2 - z4; | 2391 | tmp13 = z2 - z4; |
2392 | tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ | 2392 | tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ |
2393 | tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ | 2393 | tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ |
2394 | tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ | 2394 | tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ |
2395 | 2395 | ||
2396 | tmp13 = MULTIPLY(z2, - FIX(0.831253876)); /* -c9 */ | 2396 | tmp13 = MULTIPLY(z2, - FIX(0.831253876)); /* -c9 */ |
2397 | tmp15 = MULTIPLY(z2, - FIX(1.344997024)); /* -c3 */ | 2397 | tmp15 = MULTIPLY(z2, - FIX(1.344997024)); /* -c3 */ |
2398 | z2 = z1 - z4; | 2398 | z2 = z1 - z4; |
2399 | tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ | 2399 | tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ |
2400 | 2400 | ||
2401 | tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ | 2401 | tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ |
2402 | tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ | 2402 | tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ |
2403 | tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ | 2403 | tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ |
2404 | z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ | 2404 | z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ |
2405 | tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ | 2405 | tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ |
2406 | tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ | 2406 | tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ |
2407 | 2407 | ||
2408 | /* Final output stage */ | 2408 | /* Final output stage */ |
2409 | 2409 | ||
2410 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 2410 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
2411 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 2411 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
2412 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 2412 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
2413 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 2413 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
2414 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 2414 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
2415 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 2415 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
2416 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 2416 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
2417 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 2417 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
2418 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 2418 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
2419 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 2419 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
2420 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); | 2420 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
2421 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); | 2421 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
2422 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); | 2422 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); |
2423 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); | 2423 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); |
2424 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27, CONST_BITS-PASS1_BITS); | 2424 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27, CONST_BITS-PASS1_BITS); |
2425 | } | 2425 | } |
2426 | 2426 | ||
2427 | /* Pass 2: process 15 rows from work array, store into output array. */ | 2427 | /* Pass 2: process 15 rows from work array, store into output array. */ |
2428 | 2428 | ||
2429 | wsptr = workspace; | 2429 | wsptr = workspace; |
2430 | for (ctr = 0; ctr < 15; ctr++) { | 2430 | for (ctr = 0; ctr < 15; ctr++) { |
2431 | outptr = output_buf[ctr] + output_col; | 2431 | outptr = output_buf[ctr] + output_col; |
2432 | 2432 | ||
2433 | /* Even part */ | 2433 | /* Even part */ |
2434 | 2434 | ||
2435 | /* Add fudge factor here for final descale. */ | 2435 | /* Add fudge factor here for final descale. */ |
2436 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 2436 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
2437 | z1 <<= CONST_BITS; | 2437 | z1 <<= CONST_BITS; |
2438 | 2438 | ||
2439 | z2 = (INT32) wsptr[2]; | 2439 | z2 = (INT32) wsptr[2]; |
2440 | z3 = (INT32) wsptr[4]; | 2440 | z3 = (INT32) wsptr[4]; |
2441 | z4 = (INT32) wsptr[6]; | 2441 | z4 = (INT32) wsptr[6]; |
2442 | 2442 | ||
2443 | tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ | 2443 | tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ |
2444 | tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ | 2444 | tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ |
2445 | 2445 | ||
2446 | tmp12 = z1 - tmp10; | 2446 | tmp12 = z1 - tmp10; |
2447 | tmp13 = z1 + tmp11; | 2447 | tmp13 = z1 + tmp11; |
2448 | z1 -= (tmp11 - tmp10) << 1; /* c0 = (c6-c12)*2 */ | 2448 | z1 -= (tmp11 - tmp10) << 1; /* c0 = (c6-c12)*2 */ |
2449 | 2449 | ||
2450 | z4 = z2 - z3; | 2450 | z4 = z2 - z3; |
2451 | z3 += z2; | 2451 | z3 += z2; |
2452 | tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ | 2452 | tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ |
2453 | tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ | 2453 | tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ |
2454 | z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ | 2454 | z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ |
2455 | 2455 | ||
2456 | tmp20 = tmp13 + tmp10 + tmp11; | 2456 | tmp20 = tmp13 + tmp10 + tmp11; |
2457 | tmp23 = tmp12 - tmp10 + tmp11 + z2; | 2457 | tmp23 = tmp12 - tmp10 + tmp11 + z2; |
2458 | 2458 | ||
2459 | tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ | 2459 | tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ |
2460 | tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ | 2460 | tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ |
2461 | 2461 | ||
2462 | tmp25 = tmp13 - tmp10 - tmp11; | 2462 | tmp25 = tmp13 - tmp10 - tmp11; |
2463 | tmp26 = tmp12 + tmp10 - tmp11 - z2; | 2463 | tmp26 = tmp12 + tmp10 - tmp11 - z2; |
2464 | 2464 | ||
2465 | tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ | 2465 | tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ |
2466 | tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ | 2466 | tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ |
2467 | 2467 | ||
2468 | tmp21 = tmp12 + tmp10 + tmp11; | 2468 | tmp21 = tmp12 + tmp10 + tmp11; |
2469 | tmp24 = tmp13 - tmp10 + tmp11; | 2469 | tmp24 = tmp13 - tmp10 + tmp11; |
2470 | tmp11 += tmp11; | 2470 | tmp11 += tmp11; |
2471 | tmp22 = z1 + tmp11; /* c10 = c6-c12 */ | 2471 | tmp22 = z1 + tmp11; /* c10 = c6-c12 */ |
2472 | tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ | 2472 | tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ |
2473 | 2473 | ||
2474 | /* Odd part */ | 2474 | /* Odd part */ |
2475 | 2475 | ||
2476 | z1 = (INT32) wsptr[1]; | 2476 | z1 = (INT32) wsptr[1]; |
2477 | z2 = (INT32) wsptr[3]; | 2477 | z2 = (INT32) wsptr[3]; |
2478 | z4 = (INT32) wsptr[5]; | 2478 | z4 = (INT32) wsptr[5]; |
2479 | z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ | 2479 | z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ |
2480 | z4 = (INT32) wsptr[7]; | 2480 | z4 = (INT32) wsptr[7]; |
2481 | 2481 | ||
2482 | tmp13 = z2 - z4; | 2482 | tmp13 = z2 - z4; |
2483 | tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ | 2483 | tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ |
2484 | tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ | 2484 | tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ |
2485 | tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ | 2485 | tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ |
2486 | 2486 | ||
2487 | tmp13 = MULTIPLY(z2, - FIX(0.831253876)); /* -c9 */ | 2487 | tmp13 = MULTIPLY(z2, - FIX(0.831253876)); /* -c9 */ |
2488 | tmp15 = MULTIPLY(z2, - FIX(1.344997024)); /* -c3 */ | 2488 | tmp15 = MULTIPLY(z2, - FIX(1.344997024)); /* -c3 */ |
2489 | z2 = z1 - z4; | 2489 | z2 = z1 - z4; |
2490 | tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ | 2490 | tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ |
2491 | 2491 | ||
2492 | tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ | 2492 | tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ |
2493 | tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ | 2493 | tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ |
2494 | tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ | 2494 | tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ |
2495 | z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ | 2495 | z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ |
2496 | tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ | 2496 | tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ |
2497 | tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ | 2497 | tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ |
2498 | 2498 | ||
2499 | /* Final output stage */ | 2499 | /* Final output stage */ |
2500 | 2500 | ||
2501 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 2501 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
2502 | CONST_BITS+PASS1_BITS+3) | 2502 | CONST_BITS+PASS1_BITS+3) |
2503 | & RANGE_MASK]; | 2503 | & RANGE_MASK]; |
2504 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 2504 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
2505 | CONST_BITS+PASS1_BITS+3) | 2505 | CONST_BITS+PASS1_BITS+3) |
2506 | & RANGE_MASK]; | 2506 | & RANGE_MASK]; |
2507 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 2507 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
2508 | CONST_BITS+PASS1_BITS+3) | 2508 | CONST_BITS+PASS1_BITS+3) |
2509 | & RANGE_MASK]; | 2509 | & RANGE_MASK]; |
2510 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 2510 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
2511 | CONST_BITS+PASS1_BITS+3) | 2511 | CONST_BITS+PASS1_BITS+3) |
2512 | & RANGE_MASK]; | 2512 | & RANGE_MASK]; |
2513 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 2513 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
2514 | CONST_BITS+PASS1_BITS+3) | 2514 | CONST_BITS+PASS1_BITS+3) |
2515 | & RANGE_MASK]; | 2515 | & RANGE_MASK]; |
2516 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 2516 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
2517 | CONST_BITS+PASS1_BITS+3) | 2517 | CONST_BITS+PASS1_BITS+3) |
2518 | & RANGE_MASK]; | 2518 | & RANGE_MASK]; |
2519 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 2519 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
2520 | CONST_BITS+PASS1_BITS+3) | 2520 | CONST_BITS+PASS1_BITS+3) |
2521 | & RANGE_MASK]; | 2521 | & RANGE_MASK]; |
2522 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 2522 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
2523 | CONST_BITS+PASS1_BITS+3) | 2523 | CONST_BITS+PASS1_BITS+3) |
2524 | & RANGE_MASK]; | 2524 | & RANGE_MASK]; |
2525 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 2525 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
2526 | CONST_BITS+PASS1_BITS+3) | 2526 | CONST_BITS+PASS1_BITS+3) |
2527 | & RANGE_MASK]; | 2527 | & RANGE_MASK]; |
2528 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 2528 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
2529 | CONST_BITS+PASS1_BITS+3) | 2529 | CONST_BITS+PASS1_BITS+3) |
2530 | & RANGE_MASK]; | 2530 | & RANGE_MASK]; |
2531 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, | 2531 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
2532 | CONST_BITS+PASS1_BITS+3) | 2532 | CONST_BITS+PASS1_BITS+3) |
2533 | & RANGE_MASK]; | 2533 | & RANGE_MASK]; |
2534 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, | 2534 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
2535 | CONST_BITS+PASS1_BITS+3) | 2535 | CONST_BITS+PASS1_BITS+3) |
2536 | & RANGE_MASK]; | 2536 | & RANGE_MASK]; |
2537 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, | 2537 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, |
2538 | CONST_BITS+PASS1_BITS+3) | 2538 | CONST_BITS+PASS1_BITS+3) |
2539 | & RANGE_MASK]; | 2539 | & RANGE_MASK]; |
2540 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, | 2540 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, |
2541 | CONST_BITS+PASS1_BITS+3) | 2541 | CONST_BITS+PASS1_BITS+3) |
2542 | & RANGE_MASK]; | 2542 | & RANGE_MASK]; |
2543 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27, | 2543 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27, |
2544 | CONST_BITS+PASS1_BITS+3) | 2544 | CONST_BITS+PASS1_BITS+3) |
2545 | & RANGE_MASK]; | 2545 | & RANGE_MASK]; |
2546 | 2546 | ||
2547 | wsptr += 8; /* advance pointer to next row */ | 2547 | wsptr += 8; /* advance pointer to next row */ |
2548 | } | 2548 | } |
2549 | } | 2549 | } |
2550 | 2550 | ||
2551 | 2551 | ||
2552 | /* | 2552 | /* |
2553 | * Perform dequantization and inverse DCT on one block of coefficients, | 2553 | * Perform dequantization and inverse DCT on one block of coefficients, |
2554 | * producing a 16x16 output block. | 2554 | * producing a 16x16 output block. |
2555 | * | 2555 | * |
2556 | * Optimized algorithm with 28 multiplications in the 1-D kernel. | 2556 | * Optimized algorithm with 28 multiplications in the 1-D kernel. |
2557 | * cK represents sqrt(2) * cos(K*pi/32). | 2557 | * cK represents sqrt(2) * cos(K*pi/32). |
2558 | */ | 2558 | */ |
2559 | 2559 | ||
2560 | GLOBAL(void) | 2560 | GLOBAL(void) |
2561 | jpeg_idct_16x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 2561 | jpeg_idct_16x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
2562 | JCOEFPTR coef_block, | 2562 | JCOEFPTR coef_block, |
2563 | JSAMPARRAY output_buf, JDIMENSION output_col) | 2563 | JSAMPARRAY output_buf, JDIMENSION output_col) |
2564 | { | 2564 | { |
2565 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; | 2565 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; |
2566 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; | 2566 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
2567 | INT32 z1, z2, z3, z4; | 2567 | INT32 z1, z2, z3, z4; |
2568 | JCOEFPTR inptr; | 2568 | JCOEFPTR inptr; |
2569 | ISLOW_MULT_TYPE * quantptr; | 2569 | ISLOW_MULT_TYPE * quantptr; |
2570 | int * wsptr; | 2570 | int * wsptr; |
2571 | JSAMPROW outptr; | 2571 | JSAMPROW outptr; |
2572 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 2572 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
2573 | int ctr; | 2573 | int ctr; |
2574 | int workspace[8*16]; /* buffers data between passes */ | 2574 | int workspace[8*16]; /* buffers data between passes */ |
2575 | SHIFT_TEMPS | 2575 | SHIFT_TEMPS |
2576 | 2576 | ||
2577 | /* Pass 1: process columns from input, store into work array. */ | 2577 | /* Pass 1: process columns from input, store into work array. */ |
2578 | 2578 | ||
2579 | inptr = coef_block; | 2579 | inptr = coef_block; |
2580 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 2580 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
2581 | wsptr = workspace; | 2581 | wsptr = workspace; |
2582 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 2582 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
2583 | /* Even part */ | 2583 | /* Even part */ |
2584 | 2584 | ||
2585 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 2585 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
2586 | tmp0 <<= CONST_BITS; | 2586 | tmp0 <<= CONST_BITS; |
2587 | /* Add fudge factor here for final descale. */ | 2587 | /* Add fudge factor here for final descale. */ |
2588 | tmp0 += 1 << (CONST_BITS-PASS1_BITS-1); | 2588 | tmp0 += 1 << (CONST_BITS-PASS1_BITS-1); |
2589 | 2589 | ||
2590 | z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 2590 | z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
2591 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ | 2591 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
2592 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ | 2592 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
2593 | 2593 | ||
2594 | tmp10 = tmp0 + tmp1; | 2594 | tmp10 = tmp0 + tmp1; |
2595 | tmp11 = tmp0 - tmp1; | 2595 | tmp11 = tmp0 - tmp1; |
2596 | tmp12 = tmp0 + tmp2; | 2596 | tmp12 = tmp0 + tmp2; |
2597 | tmp13 = tmp0 - tmp2; | 2597 | tmp13 = tmp0 - tmp2; |
2598 | 2598 | ||
2599 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 2599 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
2600 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 2600 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
2601 | z3 = z1 - z2; | 2601 | z3 = z1 - z2; |
2602 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ | 2602 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
2603 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ | 2603 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
2604 | 2604 | ||
2605 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ | 2605 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
2606 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ | 2606 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
2607 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ | 2607 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
2608 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ | 2608 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
2609 | 2609 | ||
2610 | tmp20 = tmp10 + tmp0; | 2610 | tmp20 = tmp10 + tmp0; |
2611 | tmp27 = tmp10 - tmp0; | 2611 | tmp27 = tmp10 - tmp0; |
2612 | tmp21 = tmp12 + tmp1; | 2612 | tmp21 = tmp12 + tmp1; |
2613 | tmp26 = tmp12 - tmp1; | 2613 | tmp26 = tmp12 - tmp1; |
2614 | tmp22 = tmp13 + tmp2; | 2614 | tmp22 = tmp13 + tmp2; |
2615 | tmp25 = tmp13 - tmp2; | 2615 | tmp25 = tmp13 - tmp2; |
2616 | tmp23 = tmp11 + tmp3; | 2616 | tmp23 = tmp11 + tmp3; |
2617 | tmp24 = tmp11 - tmp3; | 2617 | tmp24 = tmp11 - tmp3; |
2618 | 2618 | ||
2619 | /* Odd part */ | 2619 | /* Odd part */ |
2620 | 2620 | ||
2621 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 2621 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
2622 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 2622 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
2623 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 2623 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
2624 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 2624 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
2625 | 2625 | ||
2626 | tmp11 = z1 + z3; | 2626 | tmp11 = z1 + z3; |
2627 | 2627 | ||
2628 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ | 2628 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
2629 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ | 2629 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
2630 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ | 2630 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
2631 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ | 2631 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
2632 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ | 2632 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
2633 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ | 2633 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
2634 | tmp0 = tmp1 + tmp2 + tmp3 - | 2634 | tmp0 = tmp1 + tmp2 + tmp3 - |
2635 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ | 2635 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
2636 | tmp13 = tmp10 + tmp11 + tmp12 - | 2636 | tmp13 = tmp10 + tmp11 + tmp12 - |
2637 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ | 2637 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
2638 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ | 2638 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
2639 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ | 2639 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
2640 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ | 2640 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
2641 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ | 2641 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
2642 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ | 2642 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
2643 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ | 2643 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
2644 | z2 += z4; | 2644 | z2 += z4; |
2645 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ | 2645 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
2646 | tmp1 += z1; | 2646 | tmp1 += z1; |
2647 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ | 2647 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
2648 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ | 2648 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
2649 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ | 2649 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
2650 | tmp12 += z2; | 2650 | tmp12 += z2; |
2651 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ | 2651 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
2652 | tmp2 += z2; | 2652 | tmp2 += z2; |
2653 | tmp3 += z2; | 2653 | tmp3 += z2; |
2654 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ | 2654 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
2655 | tmp10 += z2; | 2655 | tmp10 += z2; |
2656 | tmp11 += z2; | 2656 | tmp11 += z2; |
2657 | 2657 | ||
2658 | /* Final output stage */ | 2658 | /* Final output stage */ |
2659 | 2659 | ||
2660 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS); | 2660 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS); |
2661 | wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS); | 2661 | wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS); |
2662 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS); | 2662 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS); |
2663 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS); | 2663 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS); |
2664 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS); | 2664 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS); |
2665 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS); | 2665 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS); |
2666 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS); | 2666 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS); |
2667 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS); | 2667 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS); |
2668 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS); | 2668 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS); |
2669 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS); | 2669 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS); |
2670 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS); | 2670 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS); |
2671 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS); | 2671 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS); |
2672 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS); | 2672 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS); |
2673 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS); | 2673 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS); |
2674 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS); | 2674 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS); |
2675 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS); | 2675 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS); |
2676 | } | 2676 | } |
2677 | 2677 | ||
2678 | /* Pass 2: process 16 rows from work array, store into output array. */ | 2678 | /* Pass 2: process 16 rows from work array, store into output array. */ |
2679 | 2679 | ||
2680 | wsptr = workspace; | 2680 | wsptr = workspace; |
2681 | for (ctr = 0; ctr < 16; ctr++) { | 2681 | for (ctr = 0; ctr < 16; ctr++) { |
2682 | outptr = output_buf[ctr] + output_col; | 2682 | outptr = output_buf[ctr] + output_col; |
2683 | 2683 | ||
2684 | /* Even part */ | 2684 | /* Even part */ |
2685 | 2685 | ||
2686 | /* Add fudge factor here for final descale. */ | 2686 | /* Add fudge factor here for final descale. */ |
2687 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 2687 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
2688 | tmp0 <<= CONST_BITS; | 2688 | tmp0 <<= CONST_BITS; |
2689 | 2689 | ||
2690 | z1 = (INT32) wsptr[4]; | 2690 | z1 = (INT32) wsptr[4]; |
2691 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ | 2691 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
2692 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ | 2692 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
2693 | 2693 | ||
2694 | tmp10 = tmp0 + tmp1; | 2694 | tmp10 = tmp0 + tmp1; |
2695 | tmp11 = tmp0 - tmp1; | 2695 | tmp11 = tmp0 - tmp1; |
2696 | tmp12 = tmp0 + tmp2; | 2696 | tmp12 = tmp0 + tmp2; |
2697 | tmp13 = tmp0 - tmp2; | 2697 | tmp13 = tmp0 - tmp2; |
2698 | 2698 | ||
2699 | z1 = (INT32) wsptr[2]; | 2699 | z1 = (INT32) wsptr[2]; |
2700 | z2 = (INT32) wsptr[6]; | 2700 | z2 = (INT32) wsptr[6]; |
2701 | z3 = z1 - z2; | 2701 | z3 = z1 - z2; |
2702 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ | 2702 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
2703 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ | 2703 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
2704 | 2704 | ||
2705 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ | 2705 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
2706 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ | 2706 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
2707 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ | 2707 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
2708 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ | 2708 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
2709 | 2709 | ||
2710 | tmp20 = tmp10 + tmp0; | 2710 | tmp20 = tmp10 + tmp0; |
2711 | tmp27 = tmp10 - tmp0; | 2711 | tmp27 = tmp10 - tmp0; |
2712 | tmp21 = tmp12 + tmp1; | 2712 | tmp21 = tmp12 + tmp1; |
2713 | tmp26 = tmp12 - tmp1; | 2713 | tmp26 = tmp12 - tmp1; |
2714 | tmp22 = tmp13 + tmp2; | 2714 | tmp22 = tmp13 + tmp2; |
2715 | tmp25 = tmp13 - tmp2; | 2715 | tmp25 = tmp13 - tmp2; |
2716 | tmp23 = tmp11 + tmp3; | 2716 | tmp23 = tmp11 + tmp3; |
2717 | tmp24 = tmp11 - tmp3; | 2717 | tmp24 = tmp11 - tmp3; |
2718 | 2718 | ||
2719 | /* Odd part */ | 2719 | /* Odd part */ |
2720 | 2720 | ||
2721 | z1 = (INT32) wsptr[1]; | 2721 | z1 = (INT32) wsptr[1]; |
2722 | z2 = (INT32) wsptr[3]; | 2722 | z2 = (INT32) wsptr[3]; |
2723 | z3 = (INT32) wsptr[5]; | 2723 | z3 = (INT32) wsptr[5]; |
2724 | z4 = (INT32) wsptr[7]; | 2724 | z4 = (INT32) wsptr[7]; |
2725 | 2725 | ||
2726 | tmp11 = z1 + z3; | 2726 | tmp11 = z1 + z3; |
2727 | 2727 | ||
2728 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ | 2728 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
2729 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ | 2729 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
2730 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ | 2730 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
2731 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ | 2731 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
2732 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ | 2732 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
2733 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ | 2733 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
2734 | tmp0 = tmp1 + tmp2 + tmp3 - | 2734 | tmp0 = tmp1 + tmp2 + tmp3 - |
2735 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ | 2735 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
2736 | tmp13 = tmp10 + tmp11 + tmp12 - | 2736 | tmp13 = tmp10 + tmp11 + tmp12 - |
2737 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ | 2737 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
2738 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ | 2738 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
2739 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ | 2739 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
2740 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ | 2740 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
2741 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ | 2741 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
2742 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ | 2742 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
2743 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ | 2743 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
2744 | z2 += z4; | 2744 | z2 += z4; |
2745 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ | 2745 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
2746 | tmp1 += z1; | 2746 | tmp1 += z1; |
2747 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ | 2747 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
2748 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ | 2748 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
2749 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ | 2749 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
2750 | tmp12 += z2; | 2750 | tmp12 += z2; |
2751 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ | 2751 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
2752 | tmp2 += z2; | 2752 | tmp2 += z2; |
2753 | tmp3 += z2; | 2753 | tmp3 += z2; |
2754 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ | 2754 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
2755 | tmp10 += z2; | 2755 | tmp10 += z2; |
2756 | tmp11 += z2; | 2756 | tmp11 += z2; |
2757 | 2757 | ||
2758 | /* Final output stage */ | 2758 | /* Final output stage */ |
2759 | 2759 | ||
2760 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0, | 2760 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0, |
2761 | CONST_BITS+PASS1_BITS+3) | 2761 | CONST_BITS+PASS1_BITS+3) |
2762 | & RANGE_MASK]; | 2762 | & RANGE_MASK]; |
2763 | outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0, | 2763 | outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0, |
2764 | CONST_BITS+PASS1_BITS+3) | 2764 | CONST_BITS+PASS1_BITS+3) |
2765 | & RANGE_MASK]; | 2765 | & RANGE_MASK]; |
2766 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1, | 2766 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1, |
2767 | CONST_BITS+PASS1_BITS+3) | 2767 | CONST_BITS+PASS1_BITS+3) |
2768 | & RANGE_MASK]; | 2768 | & RANGE_MASK]; |
2769 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1, | 2769 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1, |
2770 | CONST_BITS+PASS1_BITS+3) | 2770 | CONST_BITS+PASS1_BITS+3) |
2771 | & RANGE_MASK]; | 2771 | & RANGE_MASK]; |
2772 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2, | 2772 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2, |
2773 | CONST_BITS+PASS1_BITS+3) | 2773 | CONST_BITS+PASS1_BITS+3) |
2774 | & RANGE_MASK]; | 2774 | & RANGE_MASK]; |
2775 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2, | 2775 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2, |
2776 | CONST_BITS+PASS1_BITS+3) | 2776 | CONST_BITS+PASS1_BITS+3) |
2777 | & RANGE_MASK]; | 2777 | & RANGE_MASK]; |
2778 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3, | 2778 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3, |
2779 | CONST_BITS+PASS1_BITS+3) | 2779 | CONST_BITS+PASS1_BITS+3) |
2780 | & RANGE_MASK]; | 2780 | & RANGE_MASK]; |
2781 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3, | 2781 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3, |
2782 | CONST_BITS+PASS1_BITS+3) | 2782 | CONST_BITS+PASS1_BITS+3) |
2783 | & RANGE_MASK]; | 2783 | & RANGE_MASK]; |
2784 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10, | 2784 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10, |
2785 | CONST_BITS+PASS1_BITS+3) | 2785 | CONST_BITS+PASS1_BITS+3) |
2786 | & RANGE_MASK]; | 2786 | & RANGE_MASK]; |
2787 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10, | 2787 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10, |
2788 | CONST_BITS+PASS1_BITS+3) | 2788 | CONST_BITS+PASS1_BITS+3) |
2789 | & RANGE_MASK]; | 2789 | & RANGE_MASK]; |
2790 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11, | 2790 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11, |
2791 | CONST_BITS+PASS1_BITS+3) | 2791 | CONST_BITS+PASS1_BITS+3) |
2792 | & RANGE_MASK]; | 2792 | & RANGE_MASK]; |
2793 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11, | 2793 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11, |
2794 | CONST_BITS+PASS1_BITS+3) | 2794 | CONST_BITS+PASS1_BITS+3) |
2795 | & RANGE_MASK]; | 2795 | & RANGE_MASK]; |
2796 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12, | 2796 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12, |
2797 | CONST_BITS+PASS1_BITS+3) | 2797 | CONST_BITS+PASS1_BITS+3) |
2798 | & RANGE_MASK]; | 2798 | & RANGE_MASK]; |
2799 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12, | 2799 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12, |
2800 | CONST_BITS+PASS1_BITS+3) | 2800 | CONST_BITS+PASS1_BITS+3) |
2801 | & RANGE_MASK]; | 2801 | & RANGE_MASK]; |
2802 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13, | 2802 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13, |
2803 | CONST_BITS+PASS1_BITS+3) | 2803 | CONST_BITS+PASS1_BITS+3) |
2804 | & RANGE_MASK]; | 2804 | & RANGE_MASK]; |
2805 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13, | 2805 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13, |
2806 | CONST_BITS+PASS1_BITS+3) | 2806 | CONST_BITS+PASS1_BITS+3) |
2807 | & RANGE_MASK]; | 2807 | & RANGE_MASK]; |
2808 | 2808 | ||
2809 | wsptr += 8; /* advance pointer to next row */ | 2809 | wsptr += 8; /* advance pointer to next row */ |
2810 | } | 2810 | } |
2811 | } | 2811 | } |
2812 | 2812 | ||
2813 | 2813 | ||
2814 | /* | 2814 | /* |
2815 | * Perform dequantization and inverse DCT on one block of coefficients, | 2815 | * Perform dequantization and inverse DCT on one block of coefficients, |
2816 | * producing a 16x8 output block. | 2816 | * producing a 16x8 output block. |
2817 | * | 2817 | * |
2818 | * 8-point IDCT in pass 1 (columns), 16-point in pass 2 (rows). | 2818 | * 8-point IDCT in pass 1 (columns), 16-point in pass 2 (rows). |
2819 | */ | 2819 | */ |
2820 | 2820 | ||
2821 | GLOBAL(void) | 2821 | GLOBAL(void) |
2822 | jpeg_idct_16x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 2822 | jpeg_idct_16x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
2823 | JCOEFPTR coef_block, | 2823 | JCOEFPTR coef_block, |
2824 | JSAMPARRAY output_buf, JDIMENSION output_col) | 2824 | JSAMPARRAY output_buf, JDIMENSION output_col) |
2825 | { | 2825 | { |
2826 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; | 2826 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; |
2827 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; | 2827 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
2828 | INT32 z1, z2, z3, z4; | 2828 | INT32 z1, z2, z3, z4; |
2829 | JCOEFPTR inptr; | 2829 | JCOEFPTR inptr; |
2830 | ISLOW_MULT_TYPE * quantptr; | 2830 | ISLOW_MULT_TYPE * quantptr; |
2831 | int * wsptr; | 2831 | int * wsptr; |
2832 | JSAMPROW outptr; | 2832 | JSAMPROW outptr; |
2833 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 2833 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
2834 | int ctr; | 2834 | int ctr; |
2835 | int workspace[8*8]; /* buffers data between passes */ | 2835 | int workspace[8*8]; /* buffers data between passes */ |
2836 | SHIFT_TEMPS | 2836 | SHIFT_TEMPS |
2837 | 2837 | ||
2838 | /* Pass 1: process columns from input, store into work array. */ | 2838 | /* Pass 1: process columns from input, store into work array. */ |
2839 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ | 2839 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ |
2840 | /* furthermore, we scale the results by 2**PASS1_BITS. */ | 2840 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
2841 | 2841 | ||
2842 | inptr = coef_block; | 2842 | inptr = coef_block; |
2843 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 2843 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
2844 | wsptr = workspace; | 2844 | wsptr = workspace; |
2845 | for (ctr = DCTSIZE; ctr > 0; ctr--) { | 2845 | for (ctr = DCTSIZE; ctr > 0; ctr--) { |
2846 | /* Due to quantization, we will usually find that many of the input | 2846 | /* Due to quantization, we will usually find that many of the input |
2847 | * coefficients are zero, especially the AC terms. We can exploit this | 2847 | * coefficients are zero, especially the AC terms. We can exploit this |
2848 | * by short-circuiting the IDCT calculation for any column in which all | 2848 | * by short-circuiting the IDCT calculation for any column in which all |
2849 | * the AC terms are zero. In that case each output is equal to the | 2849 | * the AC terms are zero. In that case each output is equal to the |
2850 | * DC coefficient (with scale factor as needed). | 2850 | * DC coefficient (with scale factor as needed). |
2851 | * With typical images and quantization tables, half or more of the | 2851 | * With typical images and quantization tables, half or more of the |
2852 | * column DCT calculations can be simplified this way. | 2852 | * column DCT calculations can be simplified this way. |
2853 | */ | 2853 | */ |
2854 | 2854 | ||
2855 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && | 2855 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && |
2856 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && | 2856 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && |
2857 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && | 2857 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && |
2858 | inptr[DCTSIZE*7] == 0) { | 2858 | inptr[DCTSIZE*7] == 0) { |
2859 | /* AC terms all zero */ | 2859 | /* AC terms all zero */ |
2860 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; | 2860 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; |
2861 | 2861 | ||
2862 | wsptr[DCTSIZE*0] = dcval; | 2862 | wsptr[DCTSIZE*0] = dcval; |
2863 | wsptr[DCTSIZE*1] = dcval; | 2863 | wsptr[DCTSIZE*1] = dcval; |
2864 | wsptr[DCTSIZE*2] = dcval; | 2864 | wsptr[DCTSIZE*2] = dcval; |
2865 | wsptr[DCTSIZE*3] = dcval; | 2865 | wsptr[DCTSIZE*3] = dcval; |
2866 | wsptr[DCTSIZE*4] = dcval; | 2866 | wsptr[DCTSIZE*4] = dcval; |
2867 | wsptr[DCTSIZE*5] = dcval; | 2867 | wsptr[DCTSIZE*5] = dcval; |
2868 | wsptr[DCTSIZE*6] = dcval; | 2868 | wsptr[DCTSIZE*6] = dcval; |
2869 | wsptr[DCTSIZE*7] = dcval; | 2869 | wsptr[DCTSIZE*7] = dcval; |
2870 | 2870 | ||
2871 | inptr++; /* advance pointers to next column */ | 2871 | inptr++; /* advance pointers to next column */ |
2872 | quantptr++; | 2872 | quantptr++; |
2873 | wsptr++; | 2873 | wsptr++; |
2874 | continue; | 2874 | continue; |
2875 | } | 2875 | } |
2876 | 2876 | ||
2877 | /* Even part: reverse the even part of the forward DCT. */ | 2877 | /* Even part: reverse the even part of the forward DCT. */ |
2878 | /* The rotator is sqrt(2)*c(-6). */ | 2878 | /* The rotator is sqrt(2)*c(-6). */ |
2879 | 2879 | ||
2880 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 2880 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
2881 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 2881 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
2882 | 2882 | ||
2883 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); | 2883 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
2884 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); | 2884 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
2885 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); | 2885 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
2886 | 2886 | ||
2887 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 2887 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
2888 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 2888 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
2889 | z2 <<= CONST_BITS; | 2889 | z2 <<= CONST_BITS; |
2890 | z3 <<= CONST_BITS; | 2890 | z3 <<= CONST_BITS; |
2891 | /* Add fudge factor here for final descale. */ | 2891 | /* Add fudge factor here for final descale. */ |
2892 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); | 2892 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); |
2893 | 2893 | ||
2894 | tmp0 = z2 + z3; | 2894 | tmp0 = z2 + z3; |
2895 | tmp1 = z2 - z3; | 2895 | tmp1 = z2 - z3; |
2896 | 2896 | ||
2897 | tmp10 = tmp0 + tmp2; | 2897 | tmp10 = tmp0 + tmp2; |
2898 | tmp13 = tmp0 - tmp2; | 2898 | tmp13 = tmp0 - tmp2; |
2899 | tmp11 = tmp1 + tmp3; | 2899 | tmp11 = tmp1 + tmp3; |
2900 | tmp12 = tmp1 - tmp3; | 2900 | tmp12 = tmp1 - tmp3; |
2901 | 2901 | ||
2902 | /* Odd part per figure 8; the matrix is unitary and hence its | 2902 | /* Odd part per figure 8; the matrix is unitary and hence its |
2903 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. | 2903 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
2904 | */ | 2904 | */ |
2905 | 2905 | ||
2906 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 2906 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
2907 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 2907 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
2908 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 2908 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
2909 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 2909 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
2910 | 2910 | ||
2911 | z2 = tmp0 + tmp2; | 2911 | z2 = tmp0 + tmp2; |
2912 | z3 = tmp1 + tmp3; | 2912 | z3 = tmp1 + tmp3; |
2913 | 2913 | ||
2914 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ | 2914 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
2915 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ | 2915 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
2916 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ | 2916 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
2917 | z2 += z1; | 2917 | z2 += z1; |
2918 | z3 += z1; | 2918 | z3 += z1; |
2919 | 2919 | ||
2920 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ | 2920 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
2921 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ | 2921 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
2922 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ | 2922 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
2923 | tmp0 += z1 + z2; | 2923 | tmp0 += z1 + z2; |
2924 | tmp3 += z1 + z3; | 2924 | tmp3 += z1 + z3; |
2925 | 2925 | ||
2926 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ | 2926 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
2927 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ | 2927 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
2928 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ | 2928 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
2929 | tmp1 += z1 + z3; | 2929 | tmp1 += z1 + z3; |
2930 | tmp2 += z1 + z2; | 2930 | tmp2 += z1 + z2; |
2931 | 2931 | ||
2932 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ | 2932 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
2933 | 2933 | ||
2934 | wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); | 2934 | wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); |
2935 | wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); | 2935 | wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); |
2936 | wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); | 2936 | wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); |
2937 | wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); | 2937 | wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); |
2938 | wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); | 2938 | wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); |
2939 | wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); | 2939 | wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); |
2940 | wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); | 2940 | wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); |
2941 | wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); | 2941 | wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); |
2942 | 2942 | ||
2943 | inptr++; /* advance pointers to next column */ | 2943 | inptr++; /* advance pointers to next column */ |
2944 | quantptr++; | 2944 | quantptr++; |
2945 | wsptr++; | 2945 | wsptr++; |
2946 | } | 2946 | } |
2947 | 2947 | ||
2948 | /* Pass 2: process 8 rows from work array, store into output array. | 2948 | /* Pass 2: process 8 rows from work array, store into output array. |
2949 | * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32). | 2949 | * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32). |
2950 | */ | 2950 | */ |
2951 | wsptr = workspace; | 2951 | wsptr = workspace; |
2952 | for (ctr = 0; ctr < 8; ctr++) { | 2952 | for (ctr = 0; ctr < 8; ctr++) { |
2953 | outptr = output_buf[ctr] + output_col; | 2953 | outptr = output_buf[ctr] + output_col; |
2954 | 2954 | ||
2955 | /* Even part */ | 2955 | /* Even part */ |
2956 | 2956 | ||
2957 | /* Add fudge factor here for final descale. */ | 2957 | /* Add fudge factor here for final descale. */ |
2958 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 2958 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
2959 | tmp0 <<= CONST_BITS; | 2959 | tmp0 <<= CONST_BITS; |
2960 | 2960 | ||
2961 | z1 = (INT32) wsptr[4]; | 2961 | z1 = (INT32) wsptr[4]; |
2962 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ | 2962 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
2963 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ | 2963 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
2964 | 2964 | ||
2965 | tmp10 = tmp0 + tmp1; | 2965 | tmp10 = tmp0 + tmp1; |
2966 | tmp11 = tmp0 - tmp1; | 2966 | tmp11 = tmp0 - tmp1; |
2967 | tmp12 = tmp0 + tmp2; | 2967 | tmp12 = tmp0 + tmp2; |
2968 | tmp13 = tmp0 - tmp2; | 2968 | tmp13 = tmp0 - tmp2; |
2969 | 2969 | ||
2970 | z1 = (INT32) wsptr[2]; | 2970 | z1 = (INT32) wsptr[2]; |
2971 | z2 = (INT32) wsptr[6]; | 2971 | z2 = (INT32) wsptr[6]; |
2972 | z3 = z1 - z2; | 2972 | z3 = z1 - z2; |
2973 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ | 2973 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
2974 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ | 2974 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
2975 | 2975 | ||
2976 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ | 2976 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
2977 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ | 2977 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
2978 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ | 2978 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
2979 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ | 2979 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
2980 | 2980 | ||
2981 | tmp20 = tmp10 + tmp0; | 2981 | tmp20 = tmp10 + tmp0; |
2982 | tmp27 = tmp10 - tmp0; | 2982 | tmp27 = tmp10 - tmp0; |
2983 | tmp21 = tmp12 + tmp1; | 2983 | tmp21 = tmp12 + tmp1; |
2984 | tmp26 = tmp12 - tmp1; | 2984 | tmp26 = tmp12 - tmp1; |
2985 | tmp22 = tmp13 + tmp2; | 2985 | tmp22 = tmp13 + tmp2; |
2986 | tmp25 = tmp13 - tmp2; | 2986 | tmp25 = tmp13 - tmp2; |
2987 | tmp23 = tmp11 + tmp3; | 2987 | tmp23 = tmp11 + tmp3; |
2988 | tmp24 = tmp11 - tmp3; | 2988 | tmp24 = tmp11 - tmp3; |
2989 | 2989 | ||
2990 | /* Odd part */ | 2990 | /* Odd part */ |
2991 | 2991 | ||
2992 | z1 = (INT32) wsptr[1]; | 2992 | z1 = (INT32) wsptr[1]; |
2993 | z2 = (INT32) wsptr[3]; | 2993 | z2 = (INT32) wsptr[3]; |
2994 | z3 = (INT32) wsptr[5]; | 2994 | z3 = (INT32) wsptr[5]; |
2995 | z4 = (INT32) wsptr[7]; | 2995 | z4 = (INT32) wsptr[7]; |
2996 | 2996 | ||
2997 | tmp11 = z1 + z3; | 2997 | tmp11 = z1 + z3; |
2998 | 2998 | ||
2999 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ | 2999 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
3000 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ | 3000 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
3001 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ | 3001 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
3002 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ | 3002 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
3003 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ | 3003 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
3004 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ | 3004 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
3005 | tmp0 = tmp1 + tmp2 + tmp3 - | 3005 | tmp0 = tmp1 + tmp2 + tmp3 - |
3006 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ | 3006 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
3007 | tmp13 = tmp10 + tmp11 + tmp12 - | 3007 | tmp13 = tmp10 + tmp11 + tmp12 - |
3008 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ | 3008 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
3009 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ | 3009 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
3010 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ | 3010 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
3011 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ | 3011 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
3012 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ | 3012 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
3013 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ | 3013 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
3014 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ | 3014 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
3015 | z2 += z4; | 3015 | z2 += z4; |
3016 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ | 3016 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
3017 | tmp1 += z1; | 3017 | tmp1 += z1; |
3018 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ | 3018 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
3019 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ | 3019 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
3020 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ | 3020 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
3021 | tmp12 += z2; | 3021 | tmp12 += z2; |
3022 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ | 3022 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
3023 | tmp2 += z2; | 3023 | tmp2 += z2; |
3024 | tmp3 += z2; | 3024 | tmp3 += z2; |
3025 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ | 3025 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
3026 | tmp10 += z2; | 3026 | tmp10 += z2; |
3027 | tmp11 += z2; | 3027 | tmp11 += z2; |
3028 | 3028 | ||
3029 | /* Final output stage */ | 3029 | /* Final output stage */ |
3030 | 3030 | ||
3031 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0, | 3031 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0, |
3032 | CONST_BITS+PASS1_BITS+3) | 3032 | CONST_BITS+PASS1_BITS+3) |
3033 | & RANGE_MASK]; | 3033 | & RANGE_MASK]; |
3034 | outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0, | 3034 | outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0, |
3035 | CONST_BITS+PASS1_BITS+3) | 3035 | CONST_BITS+PASS1_BITS+3) |
3036 | & RANGE_MASK]; | 3036 | & RANGE_MASK]; |
3037 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1, | 3037 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1, |
3038 | CONST_BITS+PASS1_BITS+3) | 3038 | CONST_BITS+PASS1_BITS+3) |
3039 | & RANGE_MASK]; | 3039 | & RANGE_MASK]; |
3040 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1, | 3040 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1, |
3041 | CONST_BITS+PASS1_BITS+3) | 3041 | CONST_BITS+PASS1_BITS+3) |
3042 | & RANGE_MASK]; | 3042 | & RANGE_MASK]; |
3043 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2, | 3043 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2, |
3044 | CONST_BITS+PASS1_BITS+3) | 3044 | CONST_BITS+PASS1_BITS+3) |
3045 | & RANGE_MASK]; | 3045 | & RANGE_MASK]; |
3046 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2, | 3046 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2, |
3047 | CONST_BITS+PASS1_BITS+3) | 3047 | CONST_BITS+PASS1_BITS+3) |
3048 | & RANGE_MASK]; | 3048 | & RANGE_MASK]; |
3049 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3, | 3049 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3, |
3050 | CONST_BITS+PASS1_BITS+3) | 3050 | CONST_BITS+PASS1_BITS+3) |
3051 | & RANGE_MASK]; | 3051 | & RANGE_MASK]; |
3052 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3, | 3052 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3, |
3053 | CONST_BITS+PASS1_BITS+3) | 3053 | CONST_BITS+PASS1_BITS+3) |
3054 | & RANGE_MASK]; | 3054 | & RANGE_MASK]; |
3055 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10, | 3055 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10, |
3056 | CONST_BITS+PASS1_BITS+3) | 3056 | CONST_BITS+PASS1_BITS+3) |
3057 | & RANGE_MASK]; | 3057 | & RANGE_MASK]; |
3058 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10, | 3058 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10, |
3059 | CONST_BITS+PASS1_BITS+3) | 3059 | CONST_BITS+PASS1_BITS+3) |
3060 | & RANGE_MASK]; | 3060 | & RANGE_MASK]; |
3061 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11, | 3061 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11, |
3062 | CONST_BITS+PASS1_BITS+3) | 3062 | CONST_BITS+PASS1_BITS+3) |
3063 | & RANGE_MASK]; | 3063 | & RANGE_MASK]; |
3064 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11, | 3064 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11, |
3065 | CONST_BITS+PASS1_BITS+3) | 3065 | CONST_BITS+PASS1_BITS+3) |
3066 | & RANGE_MASK]; | 3066 | & RANGE_MASK]; |
3067 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12, | 3067 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12, |
3068 | CONST_BITS+PASS1_BITS+3) | 3068 | CONST_BITS+PASS1_BITS+3) |
3069 | & RANGE_MASK]; | 3069 | & RANGE_MASK]; |
3070 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12, | 3070 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12, |
3071 | CONST_BITS+PASS1_BITS+3) | 3071 | CONST_BITS+PASS1_BITS+3) |
3072 | & RANGE_MASK]; | 3072 | & RANGE_MASK]; |
3073 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13, | 3073 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13, |
3074 | CONST_BITS+PASS1_BITS+3) | 3074 | CONST_BITS+PASS1_BITS+3) |
3075 | & RANGE_MASK]; | 3075 | & RANGE_MASK]; |
3076 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13, | 3076 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13, |
3077 | CONST_BITS+PASS1_BITS+3) | 3077 | CONST_BITS+PASS1_BITS+3) |
3078 | & RANGE_MASK]; | 3078 | & RANGE_MASK]; |
3079 | 3079 | ||
3080 | wsptr += 8; /* advance pointer to next row */ | 3080 | wsptr += 8; /* advance pointer to next row */ |
3081 | } | 3081 | } |
3082 | } | 3082 | } |
3083 | 3083 | ||
3084 | 3084 | ||
3085 | /* | 3085 | /* |
3086 | * Perform dequantization and inverse DCT on one block of coefficients, | 3086 | * Perform dequantization and inverse DCT on one block of coefficients, |
3087 | * producing a 14x7 output block. | 3087 | * producing a 14x7 output block. |
3088 | * | 3088 | * |
3089 | * 7-point IDCT in pass 1 (columns), 14-point in pass 2 (rows). | 3089 | * 7-point IDCT in pass 1 (columns), 14-point in pass 2 (rows). |
3090 | */ | 3090 | */ |
3091 | 3091 | ||
3092 | GLOBAL(void) | 3092 | GLOBAL(void) |
3093 | jpeg_idct_14x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3093 | jpeg_idct_14x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3094 | JCOEFPTR coef_block, | 3094 | JCOEFPTR coef_block, |
3095 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3095 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3096 | { | 3096 | { |
3097 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; | 3097 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
3098 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; | 3098 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
3099 | INT32 z1, z2, z3, z4; | 3099 | INT32 z1, z2, z3, z4; |
3100 | JCOEFPTR inptr; | 3100 | JCOEFPTR inptr; |
3101 | ISLOW_MULT_TYPE * quantptr; | 3101 | ISLOW_MULT_TYPE * quantptr; |
3102 | int * wsptr; | 3102 | int * wsptr; |
3103 | JSAMPROW outptr; | 3103 | JSAMPROW outptr; |
3104 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3104 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3105 | int ctr; | 3105 | int ctr; |
3106 | int workspace[8*7]; /* buffers data between passes */ | 3106 | int workspace[8*7]; /* buffers data between passes */ |
3107 | SHIFT_TEMPS | 3107 | SHIFT_TEMPS |
3108 | 3108 | ||
3109 | /* Pass 1: process columns from input, store into work array. | 3109 | /* Pass 1: process columns from input, store into work array. |
3110 | * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14). | 3110 | * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14). |
3111 | */ | 3111 | */ |
3112 | inptr = coef_block; | 3112 | inptr = coef_block; |
3113 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3113 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3114 | wsptr = workspace; | 3114 | wsptr = workspace; |
3115 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 3115 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
3116 | /* Even part */ | 3116 | /* Even part */ |
3117 | 3117 | ||
3118 | tmp23 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 3118 | tmp23 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
3119 | tmp23 <<= CONST_BITS; | 3119 | tmp23 <<= CONST_BITS; |
3120 | /* Add fudge factor here for final descale. */ | 3120 | /* Add fudge factor here for final descale. */ |
3121 | tmp23 += ONE << (CONST_BITS-PASS1_BITS-1); | 3121 | tmp23 += ONE << (CONST_BITS-PASS1_BITS-1); |
3122 | 3122 | ||
3123 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 3123 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
3124 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 3124 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
3125 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 3125 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
3126 | 3126 | ||
3127 | tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ | 3127 | tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
3128 | tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ | 3128 | tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
3129 | tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ | 3129 | tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
3130 | tmp10 = z1 + z3; | 3130 | tmp10 = z1 + z3; |
3131 | z2 -= tmp10; | 3131 | z2 -= tmp10; |
3132 | tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */ | 3132 | tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */ |
3133 | tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ | 3133 | tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
3134 | tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ | 3134 | tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
3135 | tmp23 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ | 3135 | tmp23 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
3136 | 3136 | ||
3137 | /* Odd part */ | 3137 | /* Odd part */ |
3138 | 3138 | ||
3139 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 3139 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
3140 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 3140 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
3141 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 3141 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
3142 | 3142 | ||
3143 | tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ | 3143 | tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
3144 | tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ | 3144 | tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
3145 | tmp10 = tmp11 - tmp12; | 3145 | tmp10 = tmp11 - tmp12; |
3146 | tmp11 += tmp12; | 3146 | tmp11 += tmp12; |
3147 | tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ | 3147 | tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
3148 | tmp11 += tmp12; | 3148 | tmp11 += tmp12; |
3149 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ | 3149 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
3150 | tmp10 += z2; | 3150 | tmp10 += z2; |
3151 | tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ | 3151 | tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
3152 | 3152 | ||
3153 | /* Final output stage */ | 3153 | /* Final output stage */ |
3154 | 3154 | ||
3155 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 3155 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
3156 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 3156 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
3157 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 3157 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
3158 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 3158 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
3159 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 3159 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
3160 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 3160 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
3161 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23, CONST_BITS-PASS1_BITS); | 3161 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23, CONST_BITS-PASS1_BITS); |
3162 | } | 3162 | } |
3163 | 3163 | ||
3164 | /* Pass 2: process 7 rows from work array, store into output array. | 3164 | /* Pass 2: process 7 rows from work array, store into output array. |
3165 | * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28). | 3165 | * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28). |
3166 | */ | 3166 | */ |
3167 | wsptr = workspace; | 3167 | wsptr = workspace; |
3168 | for (ctr = 0; ctr < 7; ctr++) { | 3168 | for (ctr = 0; ctr < 7; ctr++) { |
3169 | outptr = output_buf[ctr] + output_col; | 3169 | outptr = output_buf[ctr] + output_col; |
3170 | 3170 | ||
3171 | /* Even part */ | 3171 | /* Even part */ |
3172 | 3172 | ||
3173 | /* Add fudge factor here for final descale. */ | 3173 | /* Add fudge factor here for final descale. */ |
3174 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 3174 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
3175 | z1 <<= CONST_BITS; | 3175 | z1 <<= CONST_BITS; |
3176 | z4 = (INT32) wsptr[4]; | 3176 | z4 = (INT32) wsptr[4]; |
3177 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ | 3177 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
3178 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ | 3178 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
3179 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ | 3179 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
3180 | 3180 | ||
3181 | tmp10 = z1 + z2; | 3181 | tmp10 = z1 + z2; |
3182 | tmp11 = z1 + z3; | 3182 | tmp11 = z1 + z3; |
3183 | tmp12 = z1 - z4; | 3183 | tmp12 = z1 - z4; |
3184 | 3184 | ||
3185 | tmp23 = z1 - ((z2 + z3 - z4) << 1); /* c0 = (c4+c12-c8)*2 */ | 3185 | tmp23 = z1 - ((z2 + z3 - z4) << 1); /* c0 = (c4+c12-c8)*2 */ |
3186 | 3186 | ||
3187 | z1 = (INT32) wsptr[2]; | 3187 | z1 = (INT32) wsptr[2]; |
3188 | z2 = (INT32) wsptr[6]; | 3188 | z2 = (INT32) wsptr[6]; |
3189 | 3189 | ||
3190 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ | 3190 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
3191 | 3191 | ||
3192 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ | 3192 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
3193 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ | 3193 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
3194 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ | 3194 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
3195 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ | 3195 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
3196 | 3196 | ||
3197 | tmp20 = tmp10 + tmp13; | 3197 | tmp20 = tmp10 + tmp13; |
3198 | tmp26 = tmp10 - tmp13; | 3198 | tmp26 = tmp10 - tmp13; |
3199 | tmp21 = tmp11 + tmp14; | 3199 | tmp21 = tmp11 + tmp14; |
3200 | tmp25 = tmp11 - tmp14; | 3200 | tmp25 = tmp11 - tmp14; |
3201 | tmp22 = tmp12 + tmp15; | 3201 | tmp22 = tmp12 + tmp15; |
3202 | tmp24 = tmp12 - tmp15; | 3202 | tmp24 = tmp12 - tmp15; |
3203 | 3203 | ||
3204 | /* Odd part */ | 3204 | /* Odd part */ |
3205 | 3205 | ||
3206 | z1 = (INT32) wsptr[1]; | 3206 | z1 = (INT32) wsptr[1]; |
3207 | z2 = (INT32) wsptr[3]; | 3207 | z2 = (INT32) wsptr[3]; |
3208 | z3 = (INT32) wsptr[5]; | 3208 | z3 = (INT32) wsptr[5]; |
3209 | z4 = (INT32) wsptr[7]; | 3209 | z4 = (INT32) wsptr[7]; |
3210 | z4 <<= CONST_BITS; | 3210 | z4 <<= CONST_BITS; |
3211 | 3211 | ||
3212 | tmp14 = z1 + z3; | 3212 | tmp14 = z1 + z3; |
3213 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ | 3213 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
3214 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ | 3214 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
3215 | tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ | 3215 | tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
3216 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ | 3216 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
3217 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ | 3217 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
3218 | z1 -= z2; | 3218 | z1 -= z2; |
3219 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ | 3219 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ |
3220 | tmp16 += tmp15; | 3220 | tmp16 += tmp15; |
3221 | tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4; /* -c13 */ | 3221 | tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4; /* -c13 */ |
3222 | tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ | 3222 | tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
3223 | tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ | 3223 | tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
3224 | tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ | 3224 | tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
3225 | tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ | 3225 | tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
3226 | tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ | 3226 | tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
3227 | 3227 | ||
3228 | tmp13 = ((z1 - z3) << CONST_BITS) + z4; | 3228 | tmp13 = ((z1 - z3) << CONST_BITS) + z4; |
3229 | 3229 | ||
3230 | /* Final output stage */ | 3230 | /* Final output stage */ |
3231 | 3231 | ||
3232 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 3232 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
3233 | CONST_BITS+PASS1_BITS+3) | 3233 | CONST_BITS+PASS1_BITS+3) |
3234 | & RANGE_MASK]; | 3234 | & RANGE_MASK]; |
3235 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 3235 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
3236 | CONST_BITS+PASS1_BITS+3) | 3236 | CONST_BITS+PASS1_BITS+3) |
3237 | & RANGE_MASK]; | 3237 | & RANGE_MASK]; |
3238 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 3238 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
3239 | CONST_BITS+PASS1_BITS+3) | 3239 | CONST_BITS+PASS1_BITS+3) |
3240 | & RANGE_MASK]; | 3240 | & RANGE_MASK]; |
3241 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 3241 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
3242 | CONST_BITS+PASS1_BITS+3) | 3242 | CONST_BITS+PASS1_BITS+3) |
3243 | & RANGE_MASK]; | 3243 | & RANGE_MASK]; |
3244 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 3244 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
3245 | CONST_BITS+PASS1_BITS+3) | 3245 | CONST_BITS+PASS1_BITS+3) |
3246 | & RANGE_MASK]; | 3246 | & RANGE_MASK]; |
3247 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 3247 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
3248 | CONST_BITS+PASS1_BITS+3) | 3248 | CONST_BITS+PASS1_BITS+3) |
3249 | & RANGE_MASK]; | 3249 | & RANGE_MASK]; |
3250 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 3250 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
3251 | CONST_BITS+PASS1_BITS+3) | 3251 | CONST_BITS+PASS1_BITS+3) |
3252 | & RANGE_MASK]; | 3252 | & RANGE_MASK]; |
3253 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 3253 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
3254 | CONST_BITS+PASS1_BITS+3) | 3254 | CONST_BITS+PASS1_BITS+3) |
3255 | & RANGE_MASK]; | 3255 | & RANGE_MASK]; |
3256 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 3256 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
3257 | CONST_BITS+PASS1_BITS+3) | 3257 | CONST_BITS+PASS1_BITS+3) |
3258 | & RANGE_MASK]; | 3258 | & RANGE_MASK]; |
3259 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 3259 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
3260 | CONST_BITS+PASS1_BITS+3) | 3260 | CONST_BITS+PASS1_BITS+3) |
3261 | & RANGE_MASK]; | 3261 | & RANGE_MASK]; |
3262 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, | 3262 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
3263 | CONST_BITS+PASS1_BITS+3) | 3263 | CONST_BITS+PASS1_BITS+3) |
3264 | & RANGE_MASK]; | 3264 | & RANGE_MASK]; |
3265 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, | 3265 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
3266 | CONST_BITS+PASS1_BITS+3) | 3266 | CONST_BITS+PASS1_BITS+3) |
3267 | & RANGE_MASK]; | 3267 | & RANGE_MASK]; |
3268 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, | 3268 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, |
3269 | CONST_BITS+PASS1_BITS+3) | 3269 | CONST_BITS+PASS1_BITS+3) |
3270 | & RANGE_MASK]; | 3270 | & RANGE_MASK]; |
3271 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, | 3271 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, |
3272 | CONST_BITS+PASS1_BITS+3) | 3272 | CONST_BITS+PASS1_BITS+3) |
3273 | & RANGE_MASK]; | 3273 | & RANGE_MASK]; |
3274 | 3274 | ||
3275 | wsptr += 8; /* advance pointer to next row */ | 3275 | wsptr += 8; /* advance pointer to next row */ |
3276 | } | 3276 | } |
3277 | } | 3277 | } |
3278 | 3278 | ||
3279 | 3279 | ||
3280 | /* | 3280 | /* |
3281 | * Perform dequantization and inverse DCT on one block of coefficients, | 3281 | * Perform dequantization and inverse DCT on one block of coefficients, |
3282 | * producing a 12x6 output block. | 3282 | * producing a 12x6 output block. |
3283 | * | 3283 | * |
3284 | * 6-point IDCT in pass 1 (columns), 12-point in pass 2 (rows). | 3284 | * 6-point IDCT in pass 1 (columns), 12-point in pass 2 (rows). |
3285 | */ | 3285 | */ |
3286 | 3286 | ||
3287 | GLOBAL(void) | 3287 | GLOBAL(void) |
3288 | jpeg_idct_12x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3288 | jpeg_idct_12x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3289 | JCOEFPTR coef_block, | 3289 | JCOEFPTR coef_block, |
3290 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3290 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3291 | { | 3291 | { |
3292 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; | 3292 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
3293 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; | 3293 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
3294 | INT32 z1, z2, z3, z4; | 3294 | INT32 z1, z2, z3, z4; |
3295 | JCOEFPTR inptr; | 3295 | JCOEFPTR inptr; |
3296 | ISLOW_MULT_TYPE * quantptr; | 3296 | ISLOW_MULT_TYPE * quantptr; |
3297 | int * wsptr; | 3297 | int * wsptr; |
3298 | JSAMPROW outptr; | 3298 | JSAMPROW outptr; |
3299 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3299 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3300 | int ctr; | 3300 | int ctr; |
3301 | int workspace[8*6]; /* buffers data between passes */ | 3301 | int workspace[8*6]; /* buffers data between passes */ |
3302 | SHIFT_TEMPS | 3302 | SHIFT_TEMPS |
3303 | 3303 | ||
3304 | /* Pass 1: process columns from input, store into work array. | 3304 | /* Pass 1: process columns from input, store into work array. |
3305 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). | 3305 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
3306 | */ | 3306 | */ |
3307 | inptr = coef_block; | 3307 | inptr = coef_block; |
3308 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3308 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3309 | wsptr = workspace; | 3309 | wsptr = workspace; |
3310 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 3310 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
3311 | /* Even part */ | 3311 | /* Even part */ |
3312 | 3312 | ||
3313 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 3313 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
3314 | tmp10 <<= CONST_BITS; | 3314 | tmp10 <<= CONST_BITS; |
3315 | /* Add fudge factor here for final descale. */ | 3315 | /* Add fudge factor here for final descale. */ |
3316 | tmp10 += ONE << (CONST_BITS-PASS1_BITS-1); | 3316 | tmp10 += ONE << (CONST_BITS-PASS1_BITS-1); |
3317 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 3317 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
3318 | tmp20 = MULTIPLY(tmp12, FIX(0.707106781)); /* c4 */ | 3318 | tmp20 = MULTIPLY(tmp12, FIX(0.707106781)); /* c4 */ |
3319 | tmp11 = tmp10 + tmp20; | 3319 | tmp11 = tmp10 + tmp20; |
3320 | tmp21 = RIGHT_SHIFT(tmp10 - tmp20 - tmp20, CONST_BITS-PASS1_BITS); | 3320 | tmp21 = RIGHT_SHIFT(tmp10 - tmp20 - tmp20, CONST_BITS-PASS1_BITS); |
3321 | tmp20 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 3321 | tmp20 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
3322 | tmp10 = MULTIPLY(tmp20, FIX(1.224744871)); /* c2 */ | 3322 | tmp10 = MULTIPLY(tmp20, FIX(1.224744871)); /* c2 */ |
3323 | tmp20 = tmp11 + tmp10; | 3323 | tmp20 = tmp11 + tmp10; |
3324 | tmp22 = tmp11 - tmp10; | 3324 | tmp22 = tmp11 - tmp10; |
3325 | 3325 | ||
3326 | /* Odd part */ | 3326 | /* Odd part */ |
3327 | 3327 | ||
3328 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 3328 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
3329 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 3329 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
3330 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 3330 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
3331 | tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ | 3331 | tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
3332 | tmp10 = tmp11 + ((z1 + z2) << CONST_BITS); | 3332 | tmp10 = tmp11 + ((z1 + z2) << CONST_BITS); |
3333 | tmp12 = tmp11 + ((z3 - z2) << CONST_BITS); | 3333 | tmp12 = tmp11 + ((z3 - z2) << CONST_BITS); |
3334 | tmp11 = (z1 - z2 - z3) << PASS1_BITS; | 3334 | tmp11 = (z1 - z2 - z3) << PASS1_BITS; |
3335 | 3335 | ||
3336 | /* Final output stage */ | 3336 | /* Final output stage */ |
3337 | 3337 | ||
3338 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 3338 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
3339 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 3339 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
3340 | wsptr[8*1] = (int) (tmp21 + tmp11); | 3340 | wsptr[8*1] = (int) (tmp21 + tmp11); |
3341 | wsptr[8*4] = (int) (tmp21 - tmp11); | 3341 | wsptr[8*4] = (int) (tmp21 - tmp11); |
3342 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 3342 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
3343 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 3343 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
3344 | } | 3344 | } |
3345 | 3345 | ||
3346 | /* Pass 2: process 6 rows from work array, store into output array. | 3346 | /* Pass 2: process 6 rows from work array, store into output array. |
3347 | * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24). | 3347 | * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24). |
3348 | */ | 3348 | */ |
3349 | wsptr = workspace; | 3349 | wsptr = workspace; |
3350 | for (ctr = 0; ctr < 6; ctr++) { | 3350 | for (ctr = 0; ctr < 6; ctr++) { |
3351 | outptr = output_buf[ctr] + output_col; | 3351 | outptr = output_buf[ctr] + output_col; |
3352 | 3352 | ||
3353 | /* Even part */ | 3353 | /* Even part */ |
3354 | 3354 | ||
3355 | /* Add fudge factor here for final descale. */ | 3355 | /* Add fudge factor here for final descale. */ |
3356 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 3356 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
3357 | z3 <<= CONST_BITS; | 3357 | z3 <<= CONST_BITS; |
3358 | 3358 | ||
3359 | z4 = (INT32) wsptr[4]; | 3359 | z4 = (INT32) wsptr[4]; |
3360 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ | 3360 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
3361 | 3361 | ||
3362 | tmp10 = z3 + z4; | 3362 | tmp10 = z3 + z4; |
3363 | tmp11 = z3 - z4; | 3363 | tmp11 = z3 - z4; |
3364 | 3364 | ||
3365 | z1 = (INT32) wsptr[2]; | 3365 | z1 = (INT32) wsptr[2]; |
3366 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ | 3366 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
3367 | z1 <<= CONST_BITS; | 3367 | z1 <<= CONST_BITS; |
3368 | z2 = (INT32) wsptr[6]; | 3368 | z2 = (INT32) wsptr[6]; |
3369 | z2 <<= CONST_BITS; | 3369 | z2 <<= CONST_BITS; |
3370 | 3370 | ||
3371 | tmp12 = z1 - z2; | 3371 | tmp12 = z1 - z2; |
3372 | 3372 | ||
3373 | tmp21 = z3 + tmp12; | 3373 | tmp21 = z3 + tmp12; |
3374 | tmp24 = z3 - tmp12; | 3374 | tmp24 = z3 - tmp12; |
3375 | 3375 | ||
3376 | tmp12 = z4 + z2; | 3376 | tmp12 = z4 + z2; |
3377 | 3377 | ||
3378 | tmp20 = tmp10 + tmp12; | 3378 | tmp20 = tmp10 + tmp12; |
3379 | tmp25 = tmp10 - tmp12; | 3379 | tmp25 = tmp10 - tmp12; |
3380 | 3380 | ||
3381 | tmp12 = z4 - z1 - z2; | 3381 | tmp12 = z4 - z1 - z2; |
3382 | 3382 | ||
3383 | tmp22 = tmp11 + tmp12; | 3383 | tmp22 = tmp11 + tmp12; |
3384 | tmp23 = tmp11 - tmp12; | 3384 | tmp23 = tmp11 - tmp12; |
3385 | 3385 | ||
3386 | /* Odd part */ | 3386 | /* Odd part */ |
3387 | 3387 | ||
3388 | z1 = (INT32) wsptr[1]; | 3388 | z1 = (INT32) wsptr[1]; |
3389 | z2 = (INT32) wsptr[3]; | 3389 | z2 = (INT32) wsptr[3]; |
3390 | z3 = (INT32) wsptr[5]; | 3390 | z3 = (INT32) wsptr[5]; |
3391 | z4 = (INT32) wsptr[7]; | 3391 | z4 = (INT32) wsptr[7]; |
3392 | 3392 | ||
3393 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ | 3393 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
3394 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ | 3394 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
3395 | 3395 | ||
3396 | tmp10 = z1 + z3; | 3396 | tmp10 = z1 + z3; |
3397 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ | 3397 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
3398 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ | 3398 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
3399 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ | 3399 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
3400 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ | 3400 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
3401 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ | 3401 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
3402 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ | 3402 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
3403 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ | 3403 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
3404 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ | 3404 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
3405 | 3405 | ||
3406 | z1 -= z4; | 3406 | z1 -= z4; |
3407 | z2 -= z3; | 3407 | z2 -= z3; |
3408 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ | 3408 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
3409 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ | 3409 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
3410 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ | 3410 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
3411 | 3411 | ||
3412 | /* Final output stage */ | 3412 | /* Final output stage */ |
3413 | 3413 | ||
3414 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 3414 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
3415 | CONST_BITS+PASS1_BITS+3) | 3415 | CONST_BITS+PASS1_BITS+3) |
3416 | & RANGE_MASK]; | 3416 | & RANGE_MASK]; |
3417 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 3417 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
3418 | CONST_BITS+PASS1_BITS+3) | 3418 | CONST_BITS+PASS1_BITS+3) |
3419 | & RANGE_MASK]; | 3419 | & RANGE_MASK]; |
3420 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 3420 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
3421 | CONST_BITS+PASS1_BITS+3) | 3421 | CONST_BITS+PASS1_BITS+3) |
3422 | & RANGE_MASK]; | 3422 | & RANGE_MASK]; |
3423 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 3423 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
3424 | CONST_BITS+PASS1_BITS+3) | 3424 | CONST_BITS+PASS1_BITS+3) |
3425 | & RANGE_MASK]; | 3425 | & RANGE_MASK]; |
3426 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 3426 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
3427 | CONST_BITS+PASS1_BITS+3) | 3427 | CONST_BITS+PASS1_BITS+3) |
3428 | & RANGE_MASK]; | 3428 | & RANGE_MASK]; |
3429 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 3429 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
3430 | CONST_BITS+PASS1_BITS+3) | 3430 | CONST_BITS+PASS1_BITS+3) |
3431 | & RANGE_MASK]; | 3431 | & RANGE_MASK]; |
3432 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 3432 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
3433 | CONST_BITS+PASS1_BITS+3) | 3433 | CONST_BITS+PASS1_BITS+3) |
3434 | & RANGE_MASK]; | 3434 | & RANGE_MASK]; |
3435 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 3435 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
3436 | CONST_BITS+PASS1_BITS+3) | 3436 | CONST_BITS+PASS1_BITS+3) |
3437 | & RANGE_MASK]; | 3437 | & RANGE_MASK]; |
3438 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 3438 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
3439 | CONST_BITS+PASS1_BITS+3) | 3439 | CONST_BITS+PASS1_BITS+3) |
3440 | & RANGE_MASK]; | 3440 | & RANGE_MASK]; |
3441 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 3441 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
3442 | CONST_BITS+PASS1_BITS+3) | 3442 | CONST_BITS+PASS1_BITS+3) |
3443 | & RANGE_MASK]; | 3443 | & RANGE_MASK]; |
3444 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, | 3444 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
3445 | CONST_BITS+PASS1_BITS+3) | 3445 | CONST_BITS+PASS1_BITS+3) |
3446 | & RANGE_MASK]; | 3446 | & RANGE_MASK]; |
3447 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, | 3447 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
3448 | CONST_BITS+PASS1_BITS+3) | 3448 | CONST_BITS+PASS1_BITS+3) |
3449 | & RANGE_MASK]; | 3449 | & RANGE_MASK]; |
3450 | 3450 | ||
3451 | wsptr += 8; /* advance pointer to next row */ | 3451 | wsptr += 8; /* advance pointer to next row */ |
3452 | } | 3452 | } |
3453 | } | 3453 | } |
3454 | 3454 | ||
3455 | 3455 | ||
3456 | /* | 3456 | /* |
3457 | * Perform dequantization and inverse DCT on one block of coefficients, | 3457 | * Perform dequantization and inverse DCT on one block of coefficients, |
3458 | * producing a 10x5 output block. | 3458 | * producing a 10x5 output block. |
3459 | * | 3459 | * |
3460 | * 5-point IDCT in pass 1 (columns), 10-point in pass 2 (rows). | 3460 | * 5-point IDCT in pass 1 (columns), 10-point in pass 2 (rows). |
3461 | */ | 3461 | */ |
3462 | 3462 | ||
3463 | GLOBAL(void) | 3463 | GLOBAL(void) |
3464 | jpeg_idct_10x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3464 | jpeg_idct_10x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3465 | JCOEFPTR coef_block, | 3465 | JCOEFPTR coef_block, |
3466 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3466 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3467 | { | 3467 | { |
3468 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; | 3468 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
3469 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; | 3469 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; |
3470 | INT32 z1, z2, z3, z4; | 3470 | INT32 z1, z2, z3, z4; |
3471 | JCOEFPTR inptr; | 3471 | JCOEFPTR inptr; |
3472 | ISLOW_MULT_TYPE * quantptr; | 3472 | ISLOW_MULT_TYPE * quantptr; |
3473 | int * wsptr; | 3473 | int * wsptr; |
3474 | JSAMPROW outptr; | 3474 | JSAMPROW outptr; |
3475 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3475 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3476 | int ctr; | 3476 | int ctr; |
3477 | int workspace[8*5]; /* buffers data between passes */ | 3477 | int workspace[8*5]; /* buffers data between passes */ |
3478 | SHIFT_TEMPS | 3478 | SHIFT_TEMPS |
3479 | 3479 | ||
3480 | /* Pass 1: process columns from input, store into work array. | 3480 | /* Pass 1: process columns from input, store into work array. |
3481 | * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10). | 3481 | * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10). |
3482 | */ | 3482 | */ |
3483 | inptr = coef_block; | 3483 | inptr = coef_block; |
3484 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3484 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3485 | wsptr = workspace; | 3485 | wsptr = workspace; |
3486 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 3486 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
3487 | /* Even part */ | 3487 | /* Even part */ |
3488 | 3488 | ||
3489 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 3489 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
3490 | tmp12 <<= CONST_BITS; | 3490 | tmp12 <<= CONST_BITS; |
3491 | /* Add fudge factor here for final descale. */ | 3491 | /* Add fudge factor here for final descale. */ |
3492 | tmp12 += ONE << (CONST_BITS-PASS1_BITS-1); | 3492 | tmp12 += ONE << (CONST_BITS-PASS1_BITS-1); |
3493 | tmp13 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 3493 | tmp13 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
3494 | tmp14 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 3494 | tmp14 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
3495 | z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */ | 3495 | z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */ |
3496 | z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */ | 3496 | z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */ |
3497 | z3 = tmp12 + z2; | 3497 | z3 = tmp12 + z2; |
3498 | tmp10 = z3 + z1; | 3498 | tmp10 = z3 + z1; |
3499 | tmp11 = z3 - z1; | 3499 | tmp11 = z3 - z1; |
3500 | tmp12 -= z2 << 2; | 3500 | tmp12 -= z2 << 2; |
3501 | 3501 | ||
3502 | /* Odd part */ | 3502 | /* Odd part */ |
3503 | 3503 | ||
3504 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 3504 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
3505 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 3505 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
3506 | 3506 | ||
3507 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ | 3507 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
3508 | tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ | 3508 | tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
3509 | tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ | 3509 | tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
3510 | 3510 | ||
3511 | /* Final output stage */ | 3511 | /* Final output stage */ |
3512 | 3512 | ||
3513 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp13, CONST_BITS-PASS1_BITS); | 3513 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp13, CONST_BITS-PASS1_BITS); |
3514 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp10 - tmp13, CONST_BITS-PASS1_BITS); | 3514 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp10 - tmp13, CONST_BITS-PASS1_BITS); |
3515 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp14, CONST_BITS-PASS1_BITS); | 3515 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp14, CONST_BITS-PASS1_BITS); |
3516 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp11 - tmp14, CONST_BITS-PASS1_BITS); | 3516 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp11 - tmp14, CONST_BITS-PASS1_BITS); |
3517 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS); | 3517 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS); |
3518 | } | 3518 | } |
3519 | 3519 | ||
3520 | /* Pass 2: process 5 rows from work array, store into output array. | 3520 | /* Pass 2: process 5 rows from work array, store into output array. |
3521 | * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20). | 3521 | * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20). |
3522 | */ | 3522 | */ |
3523 | wsptr = workspace; | 3523 | wsptr = workspace; |
3524 | for (ctr = 0; ctr < 5; ctr++) { | 3524 | for (ctr = 0; ctr < 5; ctr++) { |
3525 | outptr = output_buf[ctr] + output_col; | 3525 | outptr = output_buf[ctr] + output_col; |
3526 | 3526 | ||
3527 | /* Even part */ | 3527 | /* Even part */ |
3528 | 3528 | ||
3529 | /* Add fudge factor here for final descale. */ | 3529 | /* Add fudge factor here for final descale. */ |
3530 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 3530 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
3531 | z3 <<= CONST_BITS; | 3531 | z3 <<= CONST_BITS; |
3532 | z4 = (INT32) wsptr[4]; | 3532 | z4 = (INT32) wsptr[4]; |
3533 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ | 3533 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
3534 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ | 3534 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
3535 | tmp10 = z3 + z1; | 3535 | tmp10 = z3 + z1; |
3536 | tmp11 = z3 - z2; | 3536 | tmp11 = z3 - z2; |
3537 | 3537 | ||
3538 | tmp22 = z3 - ((z1 - z2) << 1); /* c0 = (c4-c8)*2 */ | 3538 | tmp22 = z3 - ((z1 - z2) << 1); /* c0 = (c4-c8)*2 */ |
3539 | 3539 | ||
3540 | z2 = (INT32) wsptr[2]; | 3540 | z2 = (INT32) wsptr[2]; |
3541 | z3 = (INT32) wsptr[6]; | 3541 | z3 = (INT32) wsptr[6]; |
3542 | 3542 | ||
3543 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ | 3543 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
3544 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ | 3544 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
3545 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ | 3545 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
3546 | 3546 | ||
3547 | tmp20 = tmp10 + tmp12; | 3547 | tmp20 = tmp10 + tmp12; |
3548 | tmp24 = tmp10 - tmp12; | 3548 | tmp24 = tmp10 - tmp12; |
3549 | tmp21 = tmp11 + tmp13; | 3549 | tmp21 = tmp11 + tmp13; |
3550 | tmp23 = tmp11 - tmp13; | 3550 | tmp23 = tmp11 - tmp13; |
3551 | 3551 | ||
3552 | /* Odd part */ | 3552 | /* Odd part */ |
3553 | 3553 | ||
3554 | z1 = (INT32) wsptr[1]; | 3554 | z1 = (INT32) wsptr[1]; |
3555 | z2 = (INT32) wsptr[3]; | 3555 | z2 = (INT32) wsptr[3]; |
3556 | z3 = (INT32) wsptr[5]; | 3556 | z3 = (INT32) wsptr[5]; |
3557 | z3 <<= CONST_BITS; | 3557 | z3 <<= CONST_BITS; |
3558 | z4 = (INT32) wsptr[7]; | 3558 | z4 = (INT32) wsptr[7]; |
3559 | 3559 | ||
3560 | tmp11 = z2 + z4; | 3560 | tmp11 = z2 + z4; |
3561 | tmp13 = z2 - z4; | 3561 | tmp13 = z2 - z4; |
3562 | 3562 | ||
3563 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ | 3563 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
3564 | 3564 | ||
3565 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ | 3565 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
3566 | z4 = z3 + tmp12; | 3566 | z4 = z3 + tmp12; |
3567 | 3567 | ||
3568 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ | 3568 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
3569 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ | 3569 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
3570 | 3570 | ||
3571 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ | 3571 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
3572 | z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1)); | 3572 | z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
3573 | 3573 | ||
3574 | tmp12 = ((z1 - tmp13) << CONST_BITS) - z3; | 3574 | tmp12 = ((z1 - tmp13) << CONST_BITS) - z3; |
3575 | 3575 | ||
3576 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ | 3576 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
3577 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ | 3577 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
3578 | 3578 | ||
3579 | /* Final output stage */ | 3579 | /* Final output stage */ |
3580 | 3580 | ||
3581 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 3581 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
3582 | CONST_BITS+PASS1_BITS+3) | 3582 | CONST_BITS+PASS1_BITS+3) |
3583 | & RANGE_MASK]; | 3583 | & RANGE_MASK]; |
3584 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 3584 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
3585 | CONST_BITS+PASS1_BITS+3) | 3585 | CONST_BITS+PASS1_BITS+3) |
3586 | & RANGE_MASK]; | 3586 | & RANGE_MASK]; |
3587 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 3587 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
3588 | CONST_BITS+PASS1_BITS+3) | 3588 | CONST_BITS+PASS1_BITS+3) |
3589 | & RANGE_MASK]; | 3589 | & RANGE_MASK]; |
3590 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 3590 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
3591 | CONST_BITS+PASS1_BITS+3) | 3591 | CONST_BITS+PASS1_BITS+3) |
3592 | & RANGE_MASK]; | 3592 | & RANGE_MASK]; |
3593 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 3593 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
3594 | CONST_BITS+PASS1_BITS+3) | 3594 | CONST_BITS+PASS1_BITS+3) |
3595 | & RANGE_MASK]; | 3595 | & RANGE_MASK]; |
3596 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 3596 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
3597 | CONST_BITS+PASS1_BITS+3) | 3597 | CONST_BITS+PASS1_BITS+3) |
3598 | & RANGE_MASK]; | 3598 | & RANGE_MASK]; |
3599 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, | 3599 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
3600 | CONST_BITS+PASS1_BITS+3) | 3600 | CONST_BITS+PASS1_BITS+3) |
3601 | & RANGE_MASK]; | 3601 | & RANGE_MASK]; |
3602 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, | 3602 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
3603 | CONST_BITS+PASS1_BITS+3) | 3603 | CONST_BITS+PASS1_BITS+3) |
3604 | & RANGE_MASK]; | 3604 | & RANGE_MASK]; |
3605 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, | 3605 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
3606 | CONST_BITS+PASS1_BITS+3) | 3606 | CONST_BITS+PASS1_BITS+3) |
3607 | & RANGE_MASK]; | 3607 | & RANGE_MASK]; |
3608 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, | 3608 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
3609 | CONST_BITS+PASS1_BITS+3) | 3609 | CONST_BITS+PASS1_BITS+3) |
3610 | & RANGE_MASK]; | 3610 | & RANGE_MASK]; |
3611 | 3611 | ||
3612 | wsptr += 8; /* advance pointer to next row */ | 3612 | wsptr += 8; /* advance pointer to next row */ |
3613 | } | 3613 | } |
3614 | } | 3614 | } |
3615 | 3615 | ||
3616 | 3616 | ||
3617 | /* | 3617 | /* |
3618 | * Perform dequantization and inverse DCT on one block of coefficients, | 3618 | * Perform dequantization and inverse DCT on one block of coefficients, |
3619 | * producing a 8x4 output block. | 3619 | * producing a 8x4 output block. |
3620 | * | 3620 | * |
3621 | * 4-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). | 3621 | * 4-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). |
3622 | */ | 3622 | */ |
3623 | 3623 | ||
3624 | GLOBAL(void) | 3624 | GLOBAL(void) |
3625 | jpeg_idct_8x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3625 | jpeg_idct_8x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3626 | JCOEFPTR coef_block, | 3626 | JCOEFPTR coef_block, |
3627 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3627 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3628 | { | 3628 | { |
3629 | INT32 tmp0, tmp1, tmp2, tmp3; | 3629 | INT32 tmp0, tmp1, tmp2, tmp3; |
3630 | INT32 tmp10, tmp11, tmp12, tmp13; | 3630 | INT32 tmp10, tmp11, tmp12, tmp13; |
3631 | INT32 z1, z2, z3; | 3631 | INT32 z1, z2, z3; |
3632 | JCOEFPTR inptr; | 3632 | JCOEFPTR inptr; |
3633 | ISLOW_MULT_TYPE * quantptr; | 3633 | ISLOW_MULT_TYPE * quantptr; |
3634 | int * wsptr; | 3634 | int * wsptr; |
3635 | JSAMPROW outptr; | 3635 | JSAMPROW outptr; |
3636 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3636 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3637 | int ctr; | 3637 | int ctr; |
3638 | int workspace[8*4]; /* buffers data between passes */ | 3638 | int workspace[8*4]; /* buffers data between passes */ |
3639 | SHIFT_TEMPS | 3639 | SHIFT_TEMPS |
3640 | 3640 | ||
3641 | /* Pass 1: process columns from input, store into work array. | 3641 | /* Pass 1: process columns from input, store into work array. |
3642 | * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16). | 3642 | * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
3643 | */ | 3643 | */ |
3644 | inptr = coef_block; | 3644 | inptr = coef_block; |
3645 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3645 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3646 | wsptr = workspace; | 3646 | wsptr = workspace; |
3647 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 3647 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
3648 | /* Even part */ | 3648 | /* Even part */ |
3649 | 3649 | ||
3650 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 3650 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
3651 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 3651 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
3652 | 3652 | ||
3653 | tmp10 = (tmp0 + tmp2) << PASS1_BITS; | 3653 | tmp10 = (tmp0 + tmp2) << PASS1_BITS; |
3654 | tmp12 = (tmp0 - tmp2) << PASS1_BITS; | 3654 | tmp12 = (tmp0 - tmp2) << PASS1_BITS; |
3655 | 3655 | ||
3656 | /* Odd part */ | 3656 | /* Odd part */ |
3657 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ | 3657 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
3658 | 3658 | ||
3659 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 3659 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
3660 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 3660 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
3661 | 3661 | ||
3662 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ | 3662 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
3663 | /* Add fudge factor here for final descale. */ | 3663 | /* Add fudge factor here for final descale. */ |
3664 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); | 3664 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
3665 | tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */ | 3665 | tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */ |
3666 | CONST_BITS-PASS1_BITS); | 3666 | CONST_BITS-PASS1_BITS); |
3667 | tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */ | 3667 | tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */ |
3668 | CONST_BITS-PASS1_BITS); | 3668 | CONST_BITS-PASS1_BITS); |
3669 | 3669 | ||
3670 | /* Final output stage */ | 3670 | /* Final output stage */ |
3671 | 3671 | ||
3672 | wsptr[8*0] = (int) (tmp10 + tmp0); | 3672 | wsptr[8*0] = (int) (tmp10 + tmp0); |
3673 | wsptr[8*3] = (int) (tmp10 - tmp0); | 3673 | wsptr[8*3] = (int) (tmp10 - tmp0); |
3674 | wsptr[8*1] = (int) (tmp12 + tmp2); | 3674 | wsptr[8*1] = (int) (tmp12 + tmp2); |
3675 | wsptr[8*2] = (int) (tmp12 - tmp2); | 3675 | wsptr[8*2] = (int) (tmp12 - tmp2); |
3676 | } | 3676 | } |
3677 | 3677 | ||
3678 | /* Pass 2: process rows from work array, store into output array. */ | 3678 | /* Pass 2: process rows from work array, store into output array. */ |
3679 | /* Note that we must descale the results by a factor of 8 == 2**3, */ | 3679 | /* Note that we must descale the results by a factor of 8 == 2**3, */ |
3680 | /* and also undo the PASS1_BITS scaling. */ | 3680 | /* and also undo the PASS1_BITS scaling. */ |
3681 | 3681 | ||
3682 | wsptr = workspace; | 3682 | wsptr = workspace; |
3683 | for (ctr = 0; ctr < 4; ctr++) { | 3683 | for (ctr = 0; ctr < 4; ctr++) { |
3684 | outptr = output_buf[ctr] + output_col; | 3684 | outptr = output_buf[ctr] + output_col; |
3685 | 3685 | ||
3686 | /* Even part: reverse the even part of the forward DCT. */ | 3686 | /* Even part: reverse the even part of the forward DCT. */ |
3687 | /* The rotator is sqrt(2)*c(-6). */ | 3687 | /* The rotator is sqrt(2)*c(-6). */ |
3688 | 3688 | ||
3689 | z2 = (INT32) wsptr[2]; | 3689 | z2 = (INT32) wsptr[2]; |
3690 | z3 = (INT32) wsptr[6]; | 3690 | z3 = (INT32) wsptr[6]; |
3691 | 3691 | ||
3692 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); | 3692 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
3693 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); | 3693 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
3694 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); | 3694 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
3695 | 3695 | ||
3696 | /* Add fudge factor here for final descale. */ | 3696 | /* Add fudge factor here for final descale. */ |
3697 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 3697 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
3698 | z3 = (INT32) wsptr[4]; | 3698 | z3 = (INT32) wsptr[4]; |
3699 | 3699 | ||
3700 | tmp0 = (z2 + z3) << CONST_BITS; | 3700 | tmp0 = (z2 + z3) << CONST_BITS; |
3701 | tmp1 = (z2 - z3) << CONST_BITS; | 3701 | tmp1 = (z2 - z3) << CONST_BITS; |
3702 | 3702 | ||
3703 | tmp10 = tmp0 + tmp2; | 3703 | tmp10 = tmp0 + tmp2; |
3704 | tmp13 = tmp0 - tmp2; | 3704 | tmp13 = tmp0 - tmp2; |
3705 | tmp11 = tmp1 + tmp3; | 3705 | tmp11 = tmp1 + tmp3; |
3706 | tmp12 = tmp1 - tmp3; | 3706 | tmp12 = tmp1 - tmp3; |
3707 | 3707 | ||
3708 | /* Odd part per figure 8; the matrix is unitary and hence its | 3708 | /* Odd part per figure 8; the matrix is unitary and hence its |
3709 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. | 3709 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
3710 | */ | 3710 | */ |
3711 | 3711 | ||
3712 | tmp0 = (INT32) wsptr[7]; | 3712 | tmp0 = (INT32) wsptr[7]; |
3713 | tmp1 = (INT32) wsptr[5]; | 3713 | tmp1 = (INT32) wsptr[5]; |
3714 | tmp2 = (INT32) wsptr[3]; | 3714 | tmp2 = (INT32) wsptr[3]; |
3715 | tmp3 = (INT32) wsptr[1]; | 3715 | tmp3 = (INT32) wsptr[1]; |
3716 | 3716 | ||
3717 | z2 = tmp0 + tmp2; | 3717 | z2 = tmp0 + tmp2; |
3718 | z3 = tmp1 + tmp3; | 3718 | z3 = tmp1 + tmp3; |
3719 | 3719 | ||
3720 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ | 3720 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
3721 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ | 3721 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
3722 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ | 3722 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
3723 | z2 += z1; | 3723 | z2 += z1; |
3724 | z3 += z1; | 3724 | z3 += z1; |
3725 | 3725 | ||
3726 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ | 3726 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
3727 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ | 3727 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
3728 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ | 3728 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
3729 | tmp0 += z1 + z2; | 3729 | tmp0 += z1 + z2; |
3730 | tmp3 += z1 + z3; | 3730 | tmp3 += z1 + z3; |
3731 | 3731 | ||
3732 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ | 3732 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
3733 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ | 3733 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
3734 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ | 3734 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
3735 | tmp1 += z1 + z3; | 3735 | tmp1 += z1 + z3; |
3736 | tmp2 += z1 + z2; | 3736 | tmp2 += z1 + z2; |
3737 | 3737 | ||
3738 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ | 3738 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
3739 | 3739 | ||
3740 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, | 3740 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, |
3741 | CONST_BITS+PASS1_BITS+3) | 3741 | CONST_BITS+PASS1_BITS+3) |
3742 | & RANGE_MASK]; | 3742 | & RANGE_MASK]; |
3743 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, | 3743 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, |
3744 | CONST_BITS+PASS1_BITS+3) | 3744 | CONST_BITS+PASS1_BITS+3) |
3745 | & RANGE_MASK]; | 3745 | & RANGE_MASK]; |
3746 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, | 3746 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, |
3747 | CONST_BITS+PASS1_BITS+3) | 3747 | CONST_BITS+PASS1_BITS+3) |
3748 | & RANGE_MASK]; | 3748 | & RANGE_MASK]; |
3749 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, | 3749 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, |
3750 | CONST_BITS+PASS1_BITS+3) | 3750 | CONST_BITS+PASS1_BITS+3) |
3751 | & RANGE_MASK]; | 3751 | & RANGE_MASK]; |
3752 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, | 3752 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, |
3753 | CONST_BITS+PASS1_BITS+3) | 3753 | CONST_BITS+PASS1_BITS+3) |
3754 | & RANGE_MASK]; | 3754 | & RANGE_MASK]; |
3755 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, | 3755 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, |
3756 | CONST_BITS+PASS1_BITS+3) | 3756 | CONST_BITS+PASS1_BITS+3) |
3757 | & RANGE_MASK]; | 3757 | & RANGE_MASK]; |
3758 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, | 3758 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, |
3759 | CONST_BITS+PASS1_BITS+3) | 3759 | CONST_BITS+PASS1_BITS+3) |
3760 | & RANGE_MASK]; | 3760 | & RANGE_MASK]; |
3761 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, | 3761 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, |
3762 | CONST_BITS+PASS1_BITS+3) | 3762 | CONST_BITS+PASS1_BITS+3) |
3763 | & RANGE_MASK]; | 3763 | & RANGE_MASK]; |
3764 | 3764 | ||
3765 | wsptr += DCTSIZE; /* advance pointer to next row */ | 3765 | wsptr += DCTSIZE; /* advance pointer to next row */ |
3766 | } | 3766 | } |
3767 | } | 3767 | } |
3768 | 3768 | ||
3769 | 3769 | ||
3770 | /* | 3770 | /* |
3771 | * Perform dequantization and inverse DCT on one block of coefficients, | 3771 | * Perform dequantization and inverse DCT on one block of coefficients, |
3772 | * producing a reduced-size 6x3 output block. | 3772 | * producing a reduced-size 6x3 output block. |
3773 | * | 3773 | * |
3774 | * 3-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). | 3774 | * 3-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). |
3775 | */ | 3775 | */ |
3776 | 3776 | ||
3777 | GLOBAL(void) | 3777 | GLOBAL(void) |
3778 | jpeg_idct_6x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3778 | jpeg_idct_6x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3779 | JCOEFPTR coef_block, | 3779 | JCOEFPTR coef_block, |
3780 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3780 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3781 | { | 3781 | { |
3782 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; | 3782 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; |
3783 | INT32 z1, z2, z3; | 3783 | INT32 z1, z2, z3; |
3784 | JCOEFPTR inptr; | 3784 | JCOEFPTR inptr; |
3785 | ISLOW_MULT_TYPE * quantptr; | 3785 | ISLOW_MULT_TYPE * quantptr; |
3786 | int * wsptr; | 3786 | int * wsptr; |
3787 | JSAMPROW outptr; | 3787 | JSAMPROW outptr; |
3788 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3788 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3789 | int ctr; | 3789 | int ctr; |
3790 | int workspace[6*3]; /* buffers data between passes */ | 3790 | int workspace[6*3]; /* buffers data between passes */ |
3791 | SHIFT_TEMPS | 3791 | SHIFT_TEMPS |
3792 | 3792 | ||
3793 | /* Pass 1: process columns from input, store into work array. | 3793 | /* Pass 1: process columns from input, store into work array. |
3794 | * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6). | 3794 | * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6). |
3795 | */ | 3795 | */ |
3796 | inptr = coef_block; | 3796 | inptr = coef_block; |
3797 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3797 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3798 | wsptr = workspace; | 3798 | wsptr = workspace; |
3799 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { | 3799 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { |
3800 | /* Even part */ | 3800 | /* Even part */ |
3801 | 3801 | ||
3802 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 3802 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
3803 | tmp0 <<= CONST_BITS; | 3803 | tmp0 <<= CONST_BITS; |
3804 | /* Add fudge factor here for final descale. */ | 3804 | /* Add fudge factor here for final descale. */ |
3805 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); | 3805 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
3806 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 3806 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
3807 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ | 3807 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
3808 | tmp10 = tmp0 + tmp12; | 3808 | tmp10 = tmp0 + tmp12; |
3809 | tmp2 = tmp0 - tmp12 - tmp12; | 3809 | tmp2 = tmp0 - tmp12 - tmp12; |
3810 | 3810 | ||
3811 | /* Odd part */ | 3811 | /* Odd part */ |
3812 | 3812 | ||
3813 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 3813 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
3814 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ | 3814 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
3815 | 3815 | ||
3816 | /* Final output stage */ | 3816 | /* Final output stage */ |
3817 | 3817 | ||
3818 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 3818 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
3819 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 3819 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
3820 | wsptr[6*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS); | 3820 | wsptr[6*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS); |
3821 | } | 3821 | } |
3822 | 3822 | ||
3823 | /* Pass 2: process 3 rows from work array, store into output array. | 3823 | /* Pass 2: process 3 rows from work array, store into output array. |
3824 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). | 3824 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
3825 | */ | 3825 | */ |
3826 | wsptr = workspace; | 3826 | wsptr = workspace; |
3827 | for (ctr = 0; ctr < 3; ctr++) { | 3827 | for (ctr = 0; ctr < 3; ctr++) { |
3828 | outptr = output_buf[ctr] + output_col; | 3828 | outptr = output_buf[ctr] + output_col; |
3829 | 3829 | ||
3830 | /* Even part */ | 3830 | /* Even part */ |
3831 | 3831 | ||
3832 | /* Add fudge factor here for final descale. */ | 3832 | /* Add fudge factor here for final descale. */ |
3833 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 3833 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
3834 | tmp0 <<= CONST_BITS; | 3834 | tmp0 <<= CONST_BITS; |
3835 | tmp2 = (INT32) wsptr[4]; | 3835 | tmp2 = (INT32) wsptr[4]; |
3836 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ | 3836 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
3837 | tmp1 = tmp0 + tmp10; | 3837 | tmp1 = tmp0 + tmp10; |
3838 | tmp11 = tmp0 - tmp10 - tmp10; | 3838 | tmp11 = tmp0 - tmp10 - tmp10; |
3839 | tmp10 = (INT32) wsptr[2]; | 3839 | tmp10 = (INT32) wsptr[2]; |
3840 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ | 3840 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
3841 | tmp10 = tmp1 + tmp0; | 3841 | tmp10 = tmp1 + tmp0; |
3842 | tmp12 = tmp1 - tmp0; | 3842 | tmp12 = tmp1 - tmp0; |
3843 | 3843 | ||
3844 | /* Odd part */ | 3844 | /* Odd part */ |
3845 | 3845 | ||
3846 | z1 = (INT32) wsptr[1]; | 3846 | z1 = (INT32) wsptr[1]; |
3847 | z2 = (INT32) wsptr[3]; | 3847 | z2 = (INT32) wsptr[3]; |
3848 | z3 = (INT32) wsptr[5]; | 3848 | z3 = (INT32) wsptr[5]; |
3849 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ | 3849 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
3850 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); | 3850 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
3851 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); | 3851 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
3852 | tmp1 = (z1 - z2 - z3) << CONST_BITS; | 3852 | tmp1 = (z1 - z2 - z3) << CONST_BITS; |
3853 | 3853 | ||
3854 | /* Final output stage */ | 3854 | /* Final output stage */ |
3855 | 3855 | ||
3856 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 3856 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
3857 | CONST_BITS+PASS1_BITS+3) | 3857 | CONST_BITS+PASS1_BITS+3) |
3858 | & RANGE_MASK]; | 3858 | & RANGE_MASK]; |
3859 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 3859 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
3860 | CONST_BITS+PASS1_BITS+3) | 3860 | CONST_BITS+PASS1_BITS+3) |
3861 | & RANGE_MASK]; | 3861 | & RANGE_MASK]; |
3862 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, | 3862 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
3863 | CONST_BITS+PASS1_BITS+3) | 3863 | CONST_BITS+PASS1_BITS+3) |
3864 | & RANGE_MASK]; | 3864 | & RANGE_MASK]; |
3865 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, | 3865 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
3866 | CONST_BITS+PASS1_BITS+3) | 3866 | CONST_BITS+PASS1_BITS+3) |
3867 | & RANGE_MASK]; | 3867 | & RANGE_MASK]; |
3868 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 3868 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
3869 | CONST_BITS+PASS1_BITS+3) | 3869 | CONST_BITS+PASS1_BITS+3) |
3870 | & RANGE_MASK]; | 3870 | & RANGE_MASK]; |
3871 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 3871 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
3872 | CONST_BITS+PASS1_BITS+3) | 3872 | CONST_BITS+PASS1_BITS+3) |
3873 | & RANGE_MASK]; | 3873 | & RANGE_MASK]; |
3874 | 3874 | ||
3875 | wsptr += 6; /* advance pointer to next row */ | 3875 | wsptr += 6; /* advance pointer to next row */ |
3876 | } | 3876 | } |
3877 | } | 3877 | } |
3878 | 3878 | ||
3879 | 3879 | ||
3880 | /* | 3880 | /* |
3881 | * Perform dequantization and inverse DCT on one block of coefficients, | 3881 | * Perform dequantization and inverse DCT on one block of coefficients, |
3882 | * producing a 4x2 output block. | 3882 | * producing a 4x2 output block. |
3883 | * | 3883 | * |
3884 | * 2-point IDCT in pass 1 (columns), 4-point in pass 2 (rows). | 3884 | * 2-point IDCT in pass 1 (columns), 4-point in pass 2 (rows). |
3885 | */ | 3885 | */ |
3886 | 3886 | ||
3887 | GLOBAL(void) | 3887 | GLOBAL(void) |
3888 | jpeg_idct_4x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3888 | jpeg_idct_4x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3889 | JCOEFPTR coef_block, | 3889 | JCOEFPTR coef_block, |
3890 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3890 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3891 | { | 3891 | { |
3892 | INT32 tmp0, tmp2, tmp10, tmp12; | 3892 | INT32 tmp0, tmp2, tmp10, tmp12; |
3893 | INT32 z1, z2, z3; | 3893 | INT32 z1, z2, z3; |
3894 | JCOEFPTR inptr; | 3894 | JCOEFPTR inptr; |
3895 | ISLOW_MULT_TYPE * quantptr; | 3895 | ISLOW_MULT_TYPE * quantptr; |
3896 | INT32 * wsptr; | 3896 | INT32 * wsptr; |
3897 | JSAMPROW outptr; | 3897 | JSAMPROW outptr; |
3898 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3898 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3899 | int ctr; | 3899 | int ctr; |
3900 | INT32 workspace[4*2]; /* buffers data between passes */ | 3900 | INT32 workspace[4*2]; /* buffers data between passes */ |
3901 | SHIFT_TEMPS | 3901 | SHIFT_TEMPS |
3902 | 3902 | ||
3903 | /* Pass 1: process columns from input, store into work array. */ | 3903 | /* Pass 1: process columns from input, store into work array. */ |
3904 | 3904 | ||
3905 | inptr = coef_block; | 3905 | inptr = coef_block; |
3906 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3906 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3907 | wsptr = workspace; | 3907 | wsptr = workspace; |
3908 | for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) { | 3908 | for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) { |
3909 | /* Even part */ | 3909 | /* Even part */ |
3910 | 3910 | ||
3911 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 3911 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
3912 | 3912 | ||
3913 | /* Odd part */ | 3913 | /* Odd part */ |
3914 | 3914 | ||
3915 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 3915 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
3916 | 3916 | ||
3917 | /* Final output stage */ | 3917 | /* Final output stage */ |
3918 | 3918 | ||
3919 | wsptr[4*0] = tmp10 + tmp0; | 3919 | wsptr[4*0] = tmp10 + tmp0; |
3920 | wsptr[4*1] = tmp10 - tmp0; | 3920 | wsptr[4*1] = tmp10 - tmp0; |
3921 | } | 3921 | } |
3922 | 3922 | ||
3923 | /* Pass 2: process 2 rows from work array, store into output array. | 3923 | /* Pass 2: process 2 rows from work array, store into output array. |
3924 | * 4-point IDCT kernel, | 3924 | * 4-point IDCT kernel, |
3925 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. | 3925 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. |
3926 | */ | 3926 | */ |
3927 | wsptr = workspace; | 3927 | wsptr = workspace; |
3928 | for (ctr = 0; ctr < 2; ctr++) { | 3928 | for (ctr = 0; ctr < 2; ctr++) { |
3929 | outptr = output_buf[ctr] + output_col; | 3929 | outptr = output_buf[ctr] + output_col; |
3930 | 3930 | ||
3931 | /* Even part */ | 3931 | /* Even part */ |
3932 | 3932 | ||
3933 | /* Add fudge factor here for final descale. */ | 3933 | /* Add fudge factor here for final descale. */ |
3934 | tmp0 = wsptr[0] + (ONE << 2); | 3934 | tmp0 = wsptr[0] + (ONE << 2); |
3935 | tmp2 = wsptr[2]; | 3935 | tmp2 = wsptr[2]; |
3936 | 3936 | ||
3937 | tmp10 = (tmp0 + tmp2) << CONST_BITS; | 3937 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
3938 | tmp12 = (tmp0 - tmp2) << CONST_BITS; | 3938 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
3939 | 3939 | ||
3940 | /* Odd part */ | 3940 | /* Odd part */ |
3941 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ | 3941 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
3942 | 3942 | ||
3943 | z2 = wsptr[1]; | 3943 | z2 = wsptr[1]; |
3944 | z3 = wsptr[3]; | 3944 | z3 = wsptr[3]; |
3945 | 3945 | ||
3946 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ | 3946 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
3947 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ | 3947 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
3948 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ | 3948 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
3949 | 3949 | ||
3950 | /* Final output stage */ | 3950 | /* Final output stage */ |
3951 | 3951 | ||
3952 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 3952 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
3953 | CONST_BITS+3) | 3953 | CONST_BITS+3) |
3954 | & RANGE_MASK]; | 3954 | & RANGE_MASK]; |
3955 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 3955 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
3956 | CONST_BITS+3) | 3956 | CONST_BITS+3) |
3957 | & RANGE_MASK]; | 3957 | & RANGE_MASK]; |
3958 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 3958 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
3959 | CONST_BITS+3) | 3959 | CONST_BITS+3) |
3960 | & RANGE_MASK]; | 3960 | & RANGE_MASK]; |
3961 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 3961 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
3962 | CONST_BITS+3) | 3962 | CONST_BITS+3) |
3963 | & RANGE_MASK]; | 3963 | & RANGE_MASK]; |
3964 | 3964 | ||
3965 | wsptr += 4; /* advance pointer to next row */ | 3965 | wsptr += 4; /* advance pointer to next row */ |
3966 | } | 3966 | } |
3967 | } | 3967 | } |
3968 | 3968 | ||
3969 | 3969 | ||
3970 | /* | 3970 | /* |
3971 | * Perform dequantization and inverse DCT on one block of coefficients, | 3971 | * Perform dequantization and inverse DCT on one block of coefficients, |
3972 | * producing a 2x1 output block. | 3972 | * producing a 2x1 output block. |
3973 | * | 3973 | * |
3974 | * 1-point IDCT in pass 1 (columns), 2-point in pass 2 (rows). | 3974 | * 1-point IDCT in pass 1 (columns), 2-point in pass 2 (rows). |
3975 | */ | 3975 | */ |
3976 | 3976 | ||
3977 | GLOBAL(void) | 3977 | GLOBAL(void) |
3978 | jpeg_idct_2x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 3978 | jpeg_idct_2x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
3979 | JCOEFPTR coef_block, | 3979 | JCOEFPTR coef_block, |
3980 | JSAMPARRAY output_buf, JDIMENSION output_col) | 3980 | JSAMPARRAY output_buf, JDIMENSION output_col) |
3981 | { | 3981 | { |
3982 | INT32 tmp0, tmp10; | 3982 | INT32 tmp0, tmp10; |
3983 | ISLOW_MULT_TYPE * quantptr; | 3983 | ISLOW_MULT_TYPE * quantptr; |
3984 | JSAMPROW outptr; | 3984 | JSAMPROW outptr; |
3985 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 3985 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
3986 | SHIFT_TEMPS | 3986 | SHIFT_TEMPS |
3987 | 3987 | ||
3988 | /* Pass 1: empty. */ | 3988 | /* Pass 1: empty. */ |
3989 | 3989 | ||
3990 | /* Pass 2: process 1 row from input, store into output array. */ | 3990 | /* Pass 2: process 1 row from input, store into output array. */ |
3991 | 3991 | ||
3992 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 3992 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
3993 | outptr = output_buf[0] + output_col; | 3993 | outptr = output_buf[0] + output_col; |
3994 | 3994 | ||
3995 | /* Even part */ | 3995 | /* Even part */ |
3996 | 3996 | ||
3997 | tmp10 = DEQUANTIZE(coef_block[0], quantptr[0]); | 3997 | tmp10 = DEQUANTIZE(coef_block[0], quantptr[0]); |
3998 | /* Add fudge factor here for final descale. */ | 3998 | /* Add fudge factor here for final descale. */ |
3999 | tmp10 += ONE << 2; | 3999 | tmp10 += ONE << 2; |
4000 | 4000 | ||
4001 | /* Odd part */ | 4001 | /* Odd part */ |
4002 | 4002 | ||
4003 | tmp0 = DEQUANTIZE(coef_block[1], quantptr[1]); | 4003 | tmp0 = DEQUANTIZE(coef_block[1], quantptr[1]); |
4004 | 4004 | ||
4005 | /* Final output stage */ | 4005 | /* Final output stage */ |
4006 | 4006 | ||
4007 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) & RANGE_MASK]; | 4007 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) & RANGE_MASK]; |
4008 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) & RANGE_MASK]; | 4008 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) & RANGE_MASK]; |
4009 | } | 4009 | } |
4010 | 4010 | ||
4011 | 4011 | ||
4012 | /* | 4012 | /* |
4013 | * Perform dequantization and inverse DCT on one block of coefficients, | 4013 | * Perform dequantization and inverse DCT on one block of coefficients, |
4014 | * producing a 8x16 output block. | 4014 | * producing a 8x16 output block. |
4015 | * | 4015 | * |
4016 | * 16-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). | 4016 | * 16-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). |
4017 | */ | 4017 | */ |
4018 | 4018 | ||
4019 | GLOBAL(void) | 4019 | GLOBAL(void) |
4020 | jpeg_idct_8x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 4020 | jpeg_idct_8x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
4021 | JCOEFPTR coef_block, | 4021 | JCOEFPTR coef_block, |
4022 | JSAMPARRAY output_buf, JDIMENSION output_col) | 4022 | JSAMPARRAY output_buf, JDIMENSION output_col) |
4023 | { | 4023 | { |
4024 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; | 4024 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; |
4025 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; | 4025 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
4026 | INT32 z1, z2, z3, z4; | 4026 | INT32 z1, z2, z3, z4; |
4027 | JCOEFPTR inptr; | 4027 | JCOEFPTR inptr; |
4028 | ISLOW_MULT_TYPE * quantptr; | 4028 | ISLOW_MULT_TYPE * quantptr; |
4029 | int * wsptr; | 4029 | int * wsptr; |
4030 | JSAMPROW outptr; | 4030 | JSAMPROW outptr; |
4031 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 4031 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
4032 | int ctr; | 4032 | int ctr; |
4033 | int workspace[8*16]; /* buffers data between passes */ | 4033 | int workspace[8*16]; /* buffers data between passes */ |
4034 | SHIFT_TEMPS | 4034 | SHIFT_TEMPS |
4035 | 4035 | ||
4036 | /* Pass 1: process columns from input, store into work array. | 4036 | /* Pass 1: process columns from input, store into work array. |
4037 | * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32). | 4037 | * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32). |
4038 | */ | 4038 | */ |
4039 | inptr = coef_block; | 4039 | inptr = coef_block; |
4040 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 4040 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
4041 | wsptr = workspace; | 4041 | wsptr = workspace; |
4042 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { | 4042 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
4043 | /* Even part */ | 4043 | /* Even part */ |
4044 | 4044 | ||
4045 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 4045 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
4046 | tmp0 <<= CONST_BITS; | 4046 | tmp0 <<= CONST_BITS; |
4047 | /* Add fudge factor here for final descale. */ | 4047 | /* Add fudge factor here for final descale. */ |
4048 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); | 4048 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
4049 | 4049 | ||
4050 | z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 4050 | z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
4051 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ | 4051 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
4052 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ | 4052 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
4053 | 4053 | ||
4054 | tmp10 = tmp0 + tmp1; | 4054 | tmp10 = tmp0 + tmp1; |
4055 | tmp11 = tmp0 - tmp1; | 4055 | tmp11 = tmp0 - tmp1; |
4056 | tmp12 = tmp0 + tmp2; | 4056 | tmp12 = tmp0 + tmp2; |
4057 | tmp13 = tmp0 - tmp2; | 4057 | tmp13 = tmp0 - tmp2; |
4058 | 4058 | ||
4059 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 4059 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
4060 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 4060 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
4061 | z3 = z1 - z2; | 4061 | z3 = z1 - z2; |
4062 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ | 4062 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
4063 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ | 4063 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
4064 | 4064 | ||
4065 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ | 4065 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
4066 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ | 4066 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
4067 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ | 4067 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
4068 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ | 4068 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
4069 | 4069 | ||
4070 | tmp20 = tmp10 + tmp0; | 4070 | tmp20 = tmp10 + tmp0; |
4071 | tmp27 = tmp10 - tmp0; | 4071 | tmp27 = tmp10 - tmp0; |
4072 | tmp21 = tmp12 + tmp1; | 4072 | tmp21 = tmp12 + tmp1; |
4073 | tmp26 = tmp12 - tmp1; | 4073 | tmp26 = tmp12 - tmp1; |
4074 | tmp22 = tmp13 + tmp2; | 4074 | tmp22 = tmp13 + tmp2; |
4075 | tmp25 = tmp13 - tmp2; | 4075 | tmp25 = tmp13 - tmp2; |
4076 | tmp23 = tmp11 + tmp3; | 4076 | tmp23 = tmp11 + tmp3; |
4077 | tmp24 = tmp11 - tmp3; | 4077 | tmp24 = tmp11 - tmp3; |
4078 | 4078 | ||
4079 | /* Odd part */ | 4079 | /* Odd part */ |
4080 | 4080 | ||
4081 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 4081 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
4082 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 4082 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
4083 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 4083 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
4084 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 4084 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
4085 | 4085 | ||
4086 | tmp11 = z1 + z3; | 4086 | tmp11 = z1 + z3; |
4087 | 4087 | ||
4088 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ | 4088 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
4089 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ | 4089 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
4090 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ | 4090 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
4091 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ | 4091 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
4092 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ | 4092 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
4093 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ | 4093 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
4094 | tmp0 = tmp1 + tmp2 + tmp3 - | 4094 | tmp0 = tmp1 + tmp2 + tmp3 - |
4095 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ | 4095 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
4096 | tmp13 = tmp10 + tmp11 + tmp12 - | 4096 | tmp13 = tmp10 + tmp11 + tmp12 - |
4097 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ | 4097 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
4098 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ | 4098 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
4099 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ | 4099 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
4100 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ | 4100 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
4101 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ | 4101 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
4102 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ | 4102 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
4103 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ | 4103 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
4104 | z2 += z4; | 4104 | z2 += z4; |
4105 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ | 4105 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
4106 | tmp1 += z1; | 4106 | tmp1 += z1; |
4107 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ | 4107 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
4108 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ | 4108 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
4109 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ | 4109 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
4110 | tmp12 += z2; | 4110 | tmp12 += z2; |
4111 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ | 4111 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
4112 | tmp2 += z2; | 4112 | tmp2 += z2; |
4113 | tmp3 += z2; | 4113 | tmp3 += z2; |
4114 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ | 4114 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
4115 | tmp10 += z2; | 4115 | tmp10 += z2; |
4116 | tmp11 += z2; | 4116 | tmp11 += z2; |
4117 | 4117 | ||
4118 | /* Final output stage */ | 4118 | /* Final output stage */ |
4119 | 4119 | ||
4120 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS); | 4120 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS); |
4121 | wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS); | 4121 | wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS); |
4122 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS); | 4122 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS); |
4123 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS); | 4123 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS); |
4124 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS); | 4124 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS); |
4125 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS); | 4125 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS); |
4126 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS); | 4126 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS); |
4127 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS); | 4127 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS); |
4128 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS); | 4128 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS); |
4129 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS); | 4129 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS); |
4130 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS); | 4130 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS); |
4131 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS); | 4131 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS); |
4132 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS); | 4132 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS); |
4133 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS); | 4133 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS); |
4134 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS); | 4134 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS); |
4135 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS); | 4135 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS); |
4136 | } | 4136 | } |
4137 | 4137 | ||
4138 | /* Pass 2: process rows from work array, store into output array. */ | 4138 | /* Pass 2: process rows from work array, store into output array. */ |
4139 | /* Note that we must descale the results by a factor of 8 == 2**3, */ | 4139 | /* Note that we must descale the results by a factor of 8 == 2**3, */ |
4140 | /* and also undo the PASS1_BITS scaling. */ | 4140 | /* and also undo the PASS1_BITS scaling. */ |
4141 | 4141 | ||
4142 | wsptr = workspace; | 4142 | wsptr = workspace; |
4143 | for (ctr = 0; ctr < 16; ctr++) { | 4143 | for (ctr = 0; ctr < 16; ctr++) { |
4144 | outptr = output_buf[ctr] + output_col; | 4144 | outptr = output_buf[ctr] + output_col; |
4145 | 4145 | ||
4146 | /* Even part: reverse the even part of the forward DCT. */ | 4146 | /* Even part: reverse the even part of the forward DCT. */ |
4147 | /* The rotator is sqrt(2)*c(-6). */ | 4147 | /* The rotator is sqrt(2)*c(-6). */ |
4148 | 4148 | ||
4149 | z2 = (INT32) wsptr[2]; | 4149 | z2 = (INT32) wsptr[2]; |
4150 | z3 = (INT32) wsptr[6]; | 4150 | z3 = (INT32) wsptr[6]; |
4151 | 4151 | ||
4152 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); | 4152 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
4153 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); | 4153 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
4154 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); | 4154 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
4155 | 4155 | ||
4156 | /* Add fudge factor here for final descale. */ | 4156 | /* Add fudge factor here for final descale. */ |
4157 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 4157 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
4158 | z3 = (INT32) wsptr[4]; | 4158 | z3 = (INT32) wsptr[4]; |
4159 | 4159 | ||
4160 | tmp0 = (z2 + z3) << CONST_BITS; | 4160 | tmp0 = (z2 + z3) << CONST_BITS; |
4161 | tmp1 = (z2 - z3) << CONST_BITS; | 4161 | tmp1 = (z2 - z3) << CONST_BITS; |
4162 | 4162 | ||
4163 | tmp10 = tmp0 + tmp2; | 4163 | tmp10 = tmp0 + tmp2; |
4164 | tmp13 = tmp0 - tmp2; | 4164 | tmp13 = tmp0 - tmp2; |
4165 | tmp11 = tmp1 + tmp3; | 4165 | tmp11 = tmp1 + tmp3; |
4166 | tmp12 = tmp1 - tmp3; | 4166 | tmp12 = tmp1 - tmp3; |
4167 | 4167 | ||
4168 | /* Odd part per figure 8; the matrix is unitary and hence its | 4168 | /* Odd part per figure 8; the matrix is unitary and hence its |
4169 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. | 4169 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
4170 | */ | 4170 | */ |
4171 | 4171 | ||
4172 | tmp0 = (INT32) wsptr[7]; | 4172 | tmp0 = (INT32) wsptr[7]; |
4173 | tmp1 = (INT32) wsptr[5]; | 4173 | tmp1 = (INT32) wsptr[5]; |
4174 | tmp2 = (INT32) wsptr[3]; | 4174 | tmp2 = (INT32) wsptr[3]; |
4175 | tmp3 = (INT32) wsptr[1]; | 4175 | tmp3 = (INT32) wsptr[1]; |
4176 | 4176 | ||
4177 | z2 = tmp0 + tmp2; | 4177 | z2 = tmp0 + tmp2; |
4178 | z3 = tmp1 + tmp3; | 4178 | z3 = tmp1 + tmp3; |
4179 | 4179 | ||
4180 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ | 4180 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
4181 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ | 4181 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
4182 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ | 4182 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
4183 | z2 += z1; | 4183 | z2 += z1; |
4184 | z3 += z1; | 4184 | z3 += z1; |
4185 | 4185 | ||
4186 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ | 4186 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
4187 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ | 4187 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
4188 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ | 4188 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
4189 | tmp0 += z1 + z2; | 4189 | tmp0 += z1 + z2; |
4190 | tmp3 += z1 + z3; | 4190 | tmp3 += z1 + z3; |
4191 | 4191 | ||
4192 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ | 4192 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
4193 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ | 4193 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
4194 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ | 4194 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
4195 | tmp1 += z1 + z3; | 4195 | tmp1 += z1 + z3; |
4196 | tmp2 += z1 + z2; | 4196 | tmp2 += z1 + z2; |
4197 | 4197 | ||
4198 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ | 4198 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
4199 | 4199 | ||
4200 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, | 4200 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, |
4201 | CONST_BITS+PASS1_BITS+3) | 4201 | CONST_BITS+PASS1_BITS+3) |
4202 | & RANGE_MASK]; | 4202 | & RANGE_MASK]; |
4203 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, | 4203 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, |
4204 | CONST_BITS+PASS1_BITS+3) | 4204 | CONST_BITS+PASS1_BITS+3) |
4205 | & RANGE_MASK]; | 4205 | & RANGE_MASK]; |
4206 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, | 4206 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, |
4207 | CONST_BITS+PASS1_BITS+3) | 4207 | CONST_BITS+PASS1_BITS+3) |
4208 | & RANGE_MASK]; | 4208 | & RANGE_MASK]; |
4209 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, | 4209 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, |
4210 | CONST_BITS+PASS1_BITS+3) | 4210 | CONST_BITS+PASS1_BITS+3) |
4211 | & RANGE_MASK]; | 4211 | & RANGE_MASK]; |
4212 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, | 4212 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, |
4213 | CONST_BITS+PASS1_BITS+3) | 4213 | CONST_BITS+PASS1_BITS+3) |
4214 | & RANGE_MASK]; | 4214 | & RANGE_MASK]; |
4215 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, | 4215 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, |
4216 | CONST_BITS+PASS1_BITS+3) | 4216 | CONST_BITS+PASS1_BITS+3) |
4217 | & RANGE_MASK]; | 4217 | & RANGE_MASK]; |
4218 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, | 4218 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, |
4219 | CONST_BITS+PASS1_BITS+3) | 4219 | CONST_BITS+PASS1_BITS+3) |
4220 | & RANGE_MASK]; | 4220 | & RANGE_MASK]; |
4221 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, | 4221 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, |
4222 | CONST_BITS+PASS1_BITS+3) | 4222 | CONST_BITS+PASS1_BITS+3) |
4223 | & RANGE_MASK]; | 4223 | & RANGE_MASK]; |
4224 | 4224 | ||
4225 | wsptr += DCTSIZE; /* advance pointer to next row */ | 4225 | wsptr += DCTSIZE; /* advance pointer to next row */ |
4226 | } | 4226 | } |
4227 | } | 4227 | } |
4228 | 4228 | ||
4229 | 4229 | ||
4230 | /* | 4230 | /* |
4231 | * Perform dequantization and inverse DCT on one block of coefficients, | 4231 | * Perform dequantization and inverse DCT on one block of coefficients, |
4232 | * producing a 7x14 output block. | 4232 | * producing a 7x14 output block. |
4233 | * | 4233 | * |
4234 | * 14-point IDCT in pass 1 (columns), 7-point in pass 2 (rows). | 4234 | * 14-point IDCT in pass 1 (columns), 7-point in pass 2 (rows). |
4235 | */ | 4235 | */ |
4236 | 4236 | ||
4237 | GLOBAL(void) | 4237 | GLOBAL(void) |
4238 | jpeg_idct_7x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 4238 | jpeg_idct_7x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
4239 | JCOEFPTR coef_block, | 4239 | JCOEFPTR coef_block, |
4240 | JSAMPARRAY output_buf, JDIMENSION output_col) | 4240 | JSAMPARRAY output_buf, JDIMENSION output_col) |
4241 | { | 4241 | { |
4242 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; | 4242 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
4243 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; | 4243 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
4244 | INT32 z1, z2, z3, z4; | 4244 | INT32 z1, z2, z3, z4; |
4245 | JCOEFPTR inptr; | 4245 | JCOEFPTR inptr; |
4246 | ISLOW_MULT_TYPE * quantptr; | 4246 | ISLOW_MULT_TYPE * quantptr; |
4247 | int * wsptr; | 4247 | int * wsptr; |
4248 | JSAMPROW outptr; | 4248 | JSAMPROW outptr; |
4249 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 4249 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
4250 | int ctr; | 4250 | int ctr; |
4251 | int workspace[7*14]; /* buffers data between passes */ | 4251 | int workspace[7*14]; /* buffers data between passes */ |
4252 | SHIFT_TEMPS | 4252 | SHIFT_TEMPS |
4253 | 4253 | ||
4254 | /* Pass 1: process columns from input, store into work array. | 4254 | /* Pass 1: process columns from input, store into work array. |
4255 | * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28). | 4255 | * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28). |
4256 | */ | 4256 | */ |
4257 | inptr = coef_block; | 4257 | inptr = coef_block; |
4258 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 4258 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
4259 | wsptr = workspace; | 4259 | wsptr = workspace; |
4260 | for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { | 4260 | for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { |
4261 | /* Even part */ | 4261 | /* Even part */ |
4262 | 4262 | ||
4263 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 4263 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
4264 | z1 <<= CONST_BITS; | 4264 | z1 <<= CONST_BITS; |
4265 | /* Add fudge factor here for final descale. */ | 4265 | /* Add fudge factor here for final descale. */ |
4266 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); | 4266 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
4267 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 4267 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
4268 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ | 4268 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
4269 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ | 4269 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
4270 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ | 4270 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
4271 | 4271 | ||
4272 | tmp10 = z1 + z2; | 4272 | tmp10 = z1 + z2; |
4273 | tmp11 = z1 + z3; | 4273 | tmp11 = z1 + z3; |
4274 | tmp12 = z1 - z4; | 4274 | tmp12 = z1 - z4; |
4275 | 4275 | ||
4276 | tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */ | 4276 | tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */ |
4277 | CONST_BITS-PASS1_BITS); | 4277 | CONST_BITS-PASS1_BITS); |
4278 | 4278 | ||
4279 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 4279 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
4280 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 4280 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
4281 | 4281 | ||
4282 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ | 4282 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
4283 | 4283 | ||
4284 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ | 4284 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
4285 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ | 4285 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
4286 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ | 4286 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
4287 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ | 4287 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
4288 | 4288 | ||
4289 | tmp20 = tmp10 + tmp13; | 4289 | tmp20 = tmp10 + tmp13; |
4290 | tmp26 = tmp10 - tmp13; | 4290 | tmp26 = tmp10 - tmp13; |
4291 | tmp21 = tmp11 + tmp14; | 4291 | tmp21 = tmp11 + tmp14; |
4292 | tmp25 = tmp11 - tmp14; | 4292 | tmp25 = tmp11 - tmp14; |
4293 | tmp22 = tmp12 + tmp15; | 4293 | tmp22 = tmp12 + tmp15; |
4294 | tmp24 = tmp12 - tmp15; | 4294 | tmp24 = tmp12 - tmp15; |
4295 | 4295 | ||
4296 | /* Odd part */ | 4296 | /* Odd part */ |
4297 | 4297 | ||
4298 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 4298 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
4299 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 4299 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
4300 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 4300 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
4301 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 4301 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
4302 | tmp13 = z4 << CONST_BITS; | 4302 | tmp13 = z4 << CONST_BITS; |
4303 | 4303 | ||
4304 | tmp14 = z1 + z3; | 4304 | tmp14 = z1 + z3; |
4305 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ | 4305 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
4306 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ | 4306 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
4307 | tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ | 4307 | tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
4308 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ | 4308 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
4309 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ | 4309 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
4310 | z1 -= z2; | 4310 | z1 -= z2; |
4311 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ | 4311 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ |
4312 | tmp16 += tmp15; | 4312 | tmp16 += tmp15; |
4313 | z1 += z4; | 4313 | z1 += z4; |
4314 | z4 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */ | 4314 | z4 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */ |
4315 | tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ | 4315 | tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
4316 | tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ | 4316 | tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
4317 | z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ | 4317 | z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
4318 | tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ | 4318 | tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
4319 | tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ | 4319 | tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
4320 | 4320 | ||
4321 | tmp13 = (z1 - z3) << PASS1_BITS; | 4321 | tmp13 = (z1 - z3) << PASS1_BITS; |
4322 | 4322 | ||
4323 | /* Final output stage */ | 4323 | /* Final output stage */ |
4324 | 4324 | ||
4325 | wsptr[7*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 4325 | wsptr[7*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
4326 | wsptr[7*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 4326 | wsptr[7*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
4327 | wsptr[7*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 4327 | wsptr[7*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
4328 | wsptr[7*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 4328 | wsptr[7*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
4329 | wsptr[7*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 4329 | wsptr[7*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
4330 | wsptr[7*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 4330 | wsptr[7*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
4331 | wsptr[7*3] = (int) (tmp23 + tmp13); | 4331 | wsptr[7*3] = (int) (tmp23 + tmp13); |
4332 | wsptr[7*10] = (int) (tmp23 - tmp13); | 4332 | wsptr[7*10] = (int) (tmp23 - tmp13); |
4333 | wsptr[7*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 4333 | wsptr[7*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
4334 | wsptr[7*9] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 4334 | wsptr[7*9] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
4335 | wsptr[7*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); | 4335 | wsptr[7*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
4336 | wsptr[7*8] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); | 4336 | wsptr[7*8] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
4337 | wsptr[7*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); | 4337 | wsptr[7*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); |
4338 | wsptr[7*7] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); | 4338 | wsptr[7*7] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); |
4339 | } | 4339 | } |
4340 | 4340 | ||
4341 | /* Pass 2: process 14 rows from work array, store into output array. | 4341 | /* Pass 2: process 14 rows from work array, store into output array. |
4342 | * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14). | 4342 | * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14). |
4343 | */ | 4343 | */ |
4344 | wsptr = workspace; | 4344 | wsptr = workspace; |
4345 | for (ctr = 0; ctr < 14; ctr++) { | 4345 | for (ctr = 0; ctr < 14; ctr++) { |
4346 | outptr = output_buf[ctr] + output_col; | 4346 | outptr = output_buf[ctr] + output_col; |
4347 | 4347 | ||
4348 | /* Even part */ | 4348 | /* Even part */ |
4349 | 4349 | ||
4350 | /* Add fudge factor here for final descale. */ | 4350 | /* Add fudge factor here for final descale. */ |
4351 | tmp23 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 4351 | tmp23 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
4352 | tmp23 <<= CONST_BITS; | 4352 | tmp23 <<= CONST_BITS; |
4353 | 4353 | ||
4354 | z1 = (INT32) wsptr[2]; | 4354 | z1 = (INT32) wsptr[2]; |
4355 | z2 = (INT32) wsptr[4]; | 4355 | z2 = (INT32) wsptr[4]; |
4356 | z3 = (INT32) wsptr[6]; | 4356 | z3 = (INT32) wsptr[6]; |
4357 | 4357 | ||
4358 | tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ | 4358 | tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
4359 | tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ | 4359 | tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
4360 | tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ | 4360 | tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
4361 | tmp10 = z1 + z3; | 4361 | tmp10 = z1 + z3; |
4362 | z2 -= tmp10; | 4362 | z2 -= tmp10; |
4363 | tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */ | 4363 | tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */ |
4364 | tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ | 4364 | tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
4365 | tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ | 4365 | tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
4366 | tmp23 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ | 4366 | tmp23 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
4367 | 4367 | ||
4368 | /* Odd part */ | 4368 | /* Odd part */ |
4369 | 4369 | ||
4370 | z1 = (INT32) wsptr[1]; | 4370 | z1 = (INT32) wsptr[1]; |
4371 | z2 = (INT32) wsptr[3]; | 4371 | z2 = (INT32) wsptr[3]; |
4372 | z3 = (INT32) wsptr[5]; | 4372 | z3 = (INT32) wsptr[5]; |
4373 | 4373 | ||
4374 | tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ | 4374 | tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
4375 | tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ | 4375 | tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
4376 | tmp10 = tmp11 - tmp12; | 4376 | tmp10 = tmp11 - tmp12; |
4377 | tmp11 += tmp12; | 4377 | tmp11 += tmp12; |
4378 | tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ | 4378 | tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
4379 | tmp11 += tmp12; | 4379 | tmp11 += tmp12; |
4380 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ | 4380 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
4381 | tmp10 += z2; | 4381 | tmp10 += z2; |
4382 | tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ | 4382 | tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
4383 | 4383 | ||
4384 | /* Final output stage */ | 4384 | /* Final output stage */ |
4385 | 4385 | ||
4386 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 4386 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
4387 | CONST_BITS+PASS1_BITS+3) | 4387 | CONST_BITS+PASS1_BITS+3) |
4388 | & RANGE_MASK]; | 4388 | & RANGE_MASK]; |
4389 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 4389 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
4390 | CONST_BITS+PASS1_BITS+3) | 4390 | CONST_BITS+PASS1_BITS+3) |
4391 | & RANGE_MASK]; | 4391 | & RANGE_MASK]; |
4392 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 4392 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
4393 | CONST_BITS+PASS1_BITS+3) | 4393 | CONST_BITS+PASS1_BITS+3) |
4394 | & RANGE_MASK]; | 4394 | & RANGE_MASK]; |
4395 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 4395 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
4396 | CONST_BITS+PASS1_BITS+3) | 4396 | CONST_BITS+PASS1_BITS+3) |
4397 | & RANGE_MASK]; | 4397 | & RANGE_MASK]; |
4398 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 4398 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
4399 | CONST_BITS+PASS1_BITS+3) | 4399 | CONST_BITS+PASS1_BITS+3) |
4400 | & RANGE_MASK]; | 4400 | & RANGE_MASK]; |
4401 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 4401 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
4402 | CONST_BITS+PASS1_BITS+3) | 4402 | CONST_BITS+PASS1_BITS+3) |
4403 | & RANGE_MASK]; | 4403 | & RANGE_MASK]; |
4404 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23, | 4404 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23, |
4405 | CONST_BITS+PASS1_BITS+3) | 4405 | CONST_BITS+PASS1_BITS+3) |
4406 | & RANGE_MASK]; | 4406 | & RANGE_MASK]; |
4407 | 4407 | ||
4408 | wsptr += 7; /* advance pointer to next row */ | 4408 | wsptr += 7; /* advance pointer to next row */ |
4409 | } | 4409 | } |
4410 | } | 4410 | } |
4411 | 4411 | ||
4412 | 4412 | ||
4413 | /* | 4413 | /* |
4414 | * Perform dequantization and inverse DCT on one block of coefficients, | 4414 | * Perform dequantization and inverse DCT on one block of coefficients, |
4415 | * producing a 6x12 output block. | 4415 | * producing a 6x12 output block. |
4416 | * | 4416 | * |
4417 | * 12-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). | 4417 | * 12-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). |
4418 | */ | 4418 | */ |
4419 | 4419 | ||
4420 | GLOBAL(void) | 4420 | GLOBAL(void) |
4421 | jpeg_idct_6x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 4421 | jpeg_idct_6x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
4422 | JCOEFPTR coef_block, | 4422 | JCOEFPTR coef_block, |
4423 | JSAMPARRAY output_buf, JDIMENSION output_col) | 4423 | JSAMPARRAY output_buf, JDIMENSION output_col) |
4424 | { | 4424 | { |
4425 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; | 4425 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
4426 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; | 4426 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
4427 | INT32 z1, z2, z3, z4; | 4427 | INT32 z1, z2, z3, z4; |
4428 | JCOEFPTR inptr; | 4428 | JCOEFPTR inptr; |
4429 | ISLOW_MULT_TYPE * quantptr; | 4429 | ISLOW_MULT_TYPE * quantptr; |
4430 | int * wsptr; | 4430 | int * wsptr; |
4431 | JSAMPROW outptr; | 4431 | JSAMPROW outptr; |
4432 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 4432 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
4433 | int ctr; | 4433 | int ctr; |
4434 | int workspace[6*12]; /* buffers data between passes */ | 4434 | int workspace[6*12]; /* buffers data between passes */ |
4435 | SHIFT_TEMPS | 4435 | SHIFT_TEMPS |
4436 | 4436 | ||
4437 | /* Pass 1: process columns from input, store into work array. | 4437 | /* Pass 1: process columns from input, store into work array. |
4438 | * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24). | 4438 | * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24). |
4439 | */ | 4439 | */ |
4440 | inptr = coef_block; | 4440 | inptr = coef_block; |
4441 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 4441 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
4442 | wsptr = workspace; | 4442 | wsptr = workspace; |
4443 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { | 4443 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { |
4444 | /* Even part */ | 4444 | /* Even part */ |
4445 | 4445 | ||
4446 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 4446 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
4447 | z3 <<= CONST_BITS; | 4447 | z3 <<= CONST_BITS; |
4448 | /* Add fudge factor here for final descale. */ | 4448 | /* Add fudge factor here for final descale. */ |
4449 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); | 4449 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
4450 | 4450 | ||
4451 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 4451 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
4452 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ | 4452 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
4453 | 4453 | ||
4454 | tmp10 = z3 + z4; | 4454 | tmp10 = z3 + z4; |
4455 | tmp11 = z3 - z4; | 4455 | tmp11 = z3 - z4; |
4456 | 4456 | ||
4457 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 4457 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
4458 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ | 4458 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
4459 | z1 <<= CONST_BITS; | 4459 | z1 <<= CONST_BITS; |
4460 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 4460 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
4461 | z2 <<= CONST_BITS; | 4461 | z2 <<= CONST_BITS; |
4462 | 4462 | ||
4463 | tmp12 = z1 - z2; | 4463 | tmp12 = z1 - z2; |
4464 | 4464 | ||
4465 | tmp21 = z3 + tmp12; | 4465 | tmp21 = z3 + tmp12; |
4466 | tmp24 = z3 - tmp12; | 4466 | tmp24 = z3 - tmp12; |
4467 | 4467 | ||
4468 | tmp12 = z4 + z2; | 4468 | tmp12 = z4 + z2; |
4469 | 4469 | ||
4470 | tmp20 = tmp10 + tmp12; | 4470 | tmp20 = tmp10 + tmp12; |
4471 | tmp25 = tmp10 - tmp12; | 4471 | tmp25 = tmp10 - tmp12; |
4472 | 4472 | ||
4473 | tmp12 = z4 - z1 - z2; | 4473 | tmp12 = z4 - z1 - z2; |
4474 | 4474 | ||
4475 | tmp22 = tmp11 + tmp12; | 4475 | tmp22 = tmp11 + tmp12; |
4476 | tmp23 = tmp11 - tmp12; | 4476 | tmp23 = tmp11 - tmp12; |
4477 | 4477 | ||
4478 | /* Odd part */ | 4478 | /* Odd part */ |
4479 | 4479 | ||
4480 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 4480 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
4481 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 4481 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
4482 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 4482 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
4483 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 4483 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
4484 | 4484 | ||
4485 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ | 4485 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
4486 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ | 4486 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
4487 | 4487 | ||
4488 | tmp10 = z1 + z3; | 4488 | tmp10 = z1 + z3; |
4489 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ | 4489 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
4490 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ | 4490 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
4491 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ | 4491 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
4492 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ | 4492 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
4493 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ | 4493 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
4494 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ | 4494 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
4495 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ | 4495 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
4496 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ | 4496 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
4497 | 4497 | ||
4498 | z1 -= z4; | 4498 | z1 -= z4; |
4499 | z2 -= z3; | 4499 | z2 -= z3; |
4500 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ | 4500 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
4501 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ | 4501 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
4502 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ | 4502 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
4503 | 4503 | ||
4504 | /* Final output stage */ | 4504 | /* Final output stage */ |
4505 | 4505 | ||
4506 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 4506 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
4507 | wsptr[6*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 4507 | wsptr[6*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
4508 | wsptr[6*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 4508 | wsptr[6*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
4509 | wsptr[6*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 4509 | wsptr[6*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
4510 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); | 4510 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
4511 | wsptr[6*9] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); | 4511 | wsptr[6*9] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
4512 | wsptr[6*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 4512 | wsptr[6*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
4513 | wsptr[6*8] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 4513 | wsptr[6*8] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
4514 | wsptr[6*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 4514 | wsptr[6*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
4515 | wsptr[6*7] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 4515 | wsptr[6*7] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
4516 | wsptr[6*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); | 4516 | wsptr[6*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
4517 | wsptr[6*6] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); | 4517 | wsptr[6*6] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
4518 | } | 4518 | } |
4519 | 4519 | ||
4520 | /* Pass 2: process 12 rows from work array, store into output array. | 4520 | /* Pass 2: process 12 rows from work array, store into output array. |
4521 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). | 4521 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
4522 | */ | 4522 | */ |
4523 | wsptr = workspace; | 4523 | wsptr = workspace; |
4524 | for (ctr = 0; ctr < 12; ctr++) { | 4524 | for (ctr = 0; ctr < 12; ctr++) { |
4525 | outptr = output_buf[ctr] + output_col; | 4525 | outptr = output_buf[ctr] + output_col; |
4526 | 4526 | ||
4527 | /* Even part */ | 4527 | /* Even part */ |
4528 | 4528 | ||
4529 | /* Add fudge factor here for final descale. */ | 4529 | /* Add fudge factor here for final descale. */ |
4530 | tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 4530 | tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
4531 | tmp10 <<= CONST_BITS; | 4531 | tmp10 <<= CONST_BITS; |
4532 | tmp12 = (INT32) wsptr[4]; | 4532 | tmp12 = (INT32) wsptr[4]; |
4533 | tmp20 = MULTIPLY(tmp12, FIX(0.707106781)); /* c4 */ | 4533 | tmp20 = MULTIPLY(tmp12, FIX(0.707106781)); /* c4 */ |
4534 | tmp11 = tmp10 + tmp20; | 4534 | tmp11 = tmp10 + tmp20; |
4535 | tmp21 = tmp10 - tmp20 - tmp20; | 4535 | tmp21 = tmp10 - tmp20 - tmp20; |
4536 | tmp20 = (INT32) wsptr[2]; | 4536 | tmp20 = (INT32) wsptr[2]; |
4537 | tmp10 = MULTIPLY(tmp20, FIX(1.224744871)); /* c2 */ | 4537 | tmp10 = MULTIPLY(tmp20, FIX(1.224744871)); /* c2 */ |
4538 | tmp20 = tmp11 + tmp10; | 4538 | tmp20 = tmp11 + tmp10; |
4539 | tmp22 = tmp11 - tmp10; | 4539 | tmp22 = tmp11 - tmp10; |
4540 | 4540 | ||
4541 | /* Odd part */ | 4541 | /* Odd part */ |
4542 | 4542 | ||
4543 | z1 = (INT32) wsptr[1]; | 4543 | z1 = (INT32) wsptr[1]; |
4544 | z2 = (INT32) wsptr[3]; | 4544 | z2 = (INT32) wsptr[3]; |
4545 | z3 = (INT32) wsptr[5]; | 4545 | z3 = (INT32) wsptr[5]; |
4546 | tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ | 4546 | tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
4547 | tmp10 = tmp11 + ((z1 + z2) << CONST_BITS); | 4547 | tmp10 = tmp11 + ((z1 + z2) << CONST_BITS); |
4548 | tmp12 = tmp11 + ((z3 - z2) << CONST_BITS); | 4548 | tmp12 = tmp11 + ((z3 - z2) << CONST_BITS); |
4549 | tmp11 = (z1 - z2 - z3) << CONST_BITS; | 4549 | tmp11 = (z1 - z2 - z3) << CONST_BITS; |
4550 | 4550 | ||
4551 | /* Final output stage */ | 4551 | /* Final output stage */ |
4552 | 4552 | ||
4553 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, | 4553 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
4554 | CONST_BITS+PASS1_BITS+3) | 4554 | CONST_BITS+PASS1_BITS+3) |
4555 | & RANGE_MASK]; | 4555 | & RANGE_MASK]; |
4556 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, | 4556 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
4557 | CONST_BITS+PASS1_BITS+3) | 4557 | CONST_BITS+PASS1_BITS+3) |
4558 | & RANGE_MASK]; | 4558 | & RANGE_MASK]; |
4559 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, | 4559 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
4560 | CONST_BITS+PASS1_BITS+3) | 4560 | CONST_BITS+PASS1_BITS+3) |
4561 | & RANGE_MASK]; | 4561 | & RANGE_MASK]; |
4562 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, | 4562 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
4563 | CONST_BITS+PASS1_BITS+3) | 4563 | CONST_BITS+PASS1_BITS+3) |
4564 | & RANGE_MASK]; | 4564 | & RANGE_MASK]; |
4565 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, | 4565 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
4566 | CONST_BITS+PASS1_BITS+3) | 4566 | CONST_BITS+PASS1_BITS+3) |
4567 | & RANGE_MASK]; | 4567 | & RANGE_MASK]; |
4568 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, | 4568 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
4569 | CONST_BITS+PASS1_BITS+3) | 4569 | CONST_BITS+PASS1_BITS+3) |
4570 | & RANGE_MASK]; | 4570 | & RANGE_MASK]; |
4571 | 4571 | ||
4572 | wsptr += 6; /* advance pointer to next row */ | 4572 | wsptr += 6; /* advance pointer to next row */ |
4573 | } | 4573 | } |
4574 | } | 4574 | } |
4575 | 4575 | ||
4576 | 4576 | ||
4577 | /* | 4577 | /* |
4578 | * Perform dequantization and inverse DCT on one block of coefficients, | 4578 | * Perform dequantization and inverse DCT on one block of coefficients, |
4579 | * producing a 5x10 output block. | 4579 | * producing a 5x10 output block. |
4580 | * | 4580 | * |
4581 | * 10-point IDCT in pass 1 (columns), 5-point in pass 2 (rows). | 4581 | * 10-point IDCT in pass 1 (columns), 5-point in pass 2 (rows). |
4582 | */ | 4582 | */ |
4583 | 4583 | ||
4584 | GLOBAL(void) | 4584 | GLOBAL(void) |
4585 | jpeg_idct_5x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 4585 | jpeg_idct_5x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
4586 | JCOEFPTR coef_block, | 4586 | JCOEFPTR coef_block, |
4587 | JSAMPARRAY output_buf, JDIMENSION output_col) | 4587 | JSAMPARRAY output_buf, JDIMENSION output_col) |
4588 | { | 4588 | { |
4589 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; | 4589 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
4590 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; | 4590 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; |
4591 | INT32 z1, z2, z3, z4, z5; | 4591 | INT32 z1, z2, z3, z4, z5; |
4592 | JCOEFPTR inptr; | 4592 | JCOEFPTR inptr; |
4593 | ISLOW_MULT_TYPE * quantptr; | 4593 | ISLOW_MULT_TYPE * quantptr; |
4594 | int * wsptr; | 4594 | int * wsptr; |
4595 | JSAMPROW outptr; | 4595 | JSAMPROW outptr; |
4596 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 4596 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
4597 | int ctr; | 4597 | int ctr; |
4598 | int workspace[5*10]; /* buffers data between passes */ | 4598 | int workspace[5*10]; /* buffers data between passes */ |
4599 | SHIFT_TEMPS | 4599 | SHIFT_TEMPS |
4600 | 4600 | ||
4601 | /* Pass 1: process columns from input, store into work array. | 4601 | /* Pass 1: process columns from input, store into work array. |
4602 | * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20). | 4602 | * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20). |
4603 | */ | 4603 | */ |
4604 | inptr = coef_block; | 4604 | inptr = coef_block; |
4605 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 4605 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
4606 | wsptr = workspace; | 4606 | wsptr = workspace; |
4607 | for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { | 4607 | for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { |
4608 | /* Even part */ | 4608 | /* Even part */ |
4609 | 4609 | ||
4610 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 4610 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
4611 | z3 <<= CONST_BITS; | 4611 | z3 <<= CONST_BITS; |
4612 | /* Add fudge factor here for final descale. */ | 4612 | /* Add fudge factor here for final descale. */ |
4613 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); | 4613 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
4614 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 4614 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
4615 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ | 4615 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
4616 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ | 4616 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
4617 | tmp10 = z3 + z1; | 4617 | tmp10 = z3 + z1; |
4618 | tmp11 = z3 - z2; | 4618 | tmp11 = z3 - z2; |
4619 | 4619 | ||
4620 | tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1), /* c0 = (c4-c8)*2 */ | 4620 | tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1), /* c0 = (c4-c8)*2 */ |
4621 | CONST_BITS-PASS1_BITS); | 4621 | CONST_BITS-PASS1_BITS); |
4622 | 4622 | ||
4623 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 4623 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
4624 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 4624 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
4625 | 4625 | ||
4626 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ | 4626 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
4627 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ | 4627 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
4628 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ | 4628 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
4629 | 4629 | ||
4630 | tmp20 = tmp10 + tmp12; | 4630 | tmp20 = tmp10 + tmp12; |
4631 | tmp24 = tmp10 - tmp12; | 4631 | tmp24 = tmp10 - tmp12; |
4632 | tmp21 = tmp11 + tmp13; | 4632 | tmp21 = tmp11 + tmp13; |
4633 | tmp23 = tmp11 - tmp13; | 4633 | tmp23 = tmp11 - tmp13; |
4634 | 4634 | ||
4635 | /* Odd part */ | 4635 | /* Odd part */ |
4636 | 4636 | ||
4637 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 4637 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
4638 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 4638 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
4639 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 4639 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
4640 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 4640 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
4641 | 4641 | ||
4642 | tmp11 = z2 + z4; | 4642 | tmp11 = z2 + z4; |
4643 | tmp13 = z2 - z4; | 4643 | tmp13 = z2 - z4; |
4644 | 4644 | ||
4645 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ | 4645 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
4646 | z5 = z3 << CONST_BITS; | 4646 | z5 = z3 << CONST_BITS; |
4647 | 4647 | ||
4648 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ | 4648 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
4649 | z4 = z5 + tmp12; | 4649 | z4 = z5 + tmp12; |
4650 | 4650 | ||
4651 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ | 4651 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
4652 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ | 4652 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
4653 | 4653 | ||
4654 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ | 4654 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
4655 | z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1)); | 4655 | z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
4656 | 4656 | ||
4657 | tmp12 = (z1 - tmp13 - z3) << PASS1_BITS; | 4657 | tmp12 = (z1 - tmp13 - z3) << PASS1_BITS; |
4658 | 4658 | ||
4659 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ | 4659 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
4660 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ | 4660 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
4661 | 4661 | ||
4662 | /* Final output stage */ | 4662 | /* Final output stage */ |
4663 | 4663 | ||
4664 | wsptr[5*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); | 4664 | wsptr[5*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
4665 | wsptr[5*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); | 4665 | wsptr[5*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
4666 | wsptr[5*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); | 4666 | wsptr[5*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
4667 | wsptr[5*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); | 4667 | wsptr[5*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
4668 | wsptr[5*2] = (int) (tmp22 + tmp12); | 4668 | wsptr[5*2] = (int) (tmp22 + tmp12); |
4669 | wsptr[5*7] = (int) (tmp22 - tmp12); | 4669 | wsptr[5*7] = (int) (tmp22 - tmp12); |
4670 | wsptr[5*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); | 4670 | wsptr[5*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
4671 | wsptr[5*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); | 4671 | wsptr[5*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
4672 | wsptr[5*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); | 4672 | wsptr[5*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
4673 | wsptr[5*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); | 4673 | wsptr[5*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
4674 | } | 4674 | } |
4675 | 4675 | ||
4676 | /* Pass 2: process 10 rows from work array, store into output array. | 4676 | /* Pass 2: process 10 rows from work array, store into output array. |
4677 | * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10). | 4677 | * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10). |
4678 | */ | 4678 | */ |
4679 | wsptr = workspace; | 4679 | wsptr = workspace; |
4680 | for (ctr = 0; ctr < 10; ctr++) { | 4680 | for (ctr = 0; ctr < 10; ctr++) { |
4681 | outptr = output_buf[ctr] + output_col; | 4681 | outptr = output_buf[ctr] + output_col; |
4682 | 4682 | ||
4683 | /* Even part */ | 4683 | /* Even part */ |
4684 | 4684 | ||
4685 | /* Add fudge factor here for final descale. */ | 4685 | /* Add fudge factor here for final descale. */ |
4686 | tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 4686 | tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
4687 | tmp12 <<= CONST_BITS; | 4687 | tmp12 <<= CONST_BITS; |
4688 | tmp13 = (INT32) wsptr[2]; | 4688 | tmp13 = (INT32) wsptr[2]; |
4689 | tmp14 = (INT32) wsptr[4]; | 4689 | tmp14 = (INT32) wsptr[4]; |
4690 | z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */ | 4690 | z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */ |
4691 | z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */ | 4691 | z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */ |
4692 | z3 = tmp12 + z2; | 4692 | z3 = tmp12 + z2; |
4693 | tmp10 = z3 + z1; | 4693 | tmp10 = z3 + z1; |
4694 | tmp11 = z3 - z1; | 4694 | tmp11 = z3 - z1; |
4695 | tmp12 -= z2 << 2; | 4695 | tmp12 -= z2 << 2; |
4696 | 4696 | ||
4697 | /* Odd part */ | 4697 | /* Odd part */ |
4698 | 4698 | ||
4699 | z2 = (INT32) wsptr[1]; | 4699 | z2 = (INT32) wsptr[1]; |
4700 | z3 = (INT32) wsptr[3]; | 4700 | z3 = (INT32) wsptr[3]; |
4701 | 4701 | ||
4702 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ | 4702 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
4703 | tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ | 4703 | tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
4704 | tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ | 4704 | tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
4705 | 4705 | ||
4706 | /* Final output stage */ | 4706 | /* Final output stage */ |
4707 | 4707 | ||
4708 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp13, | 4708 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp13, |
4709 | CONST_BITS+PASS1_BITS+3) | 4709 | CONST_BITS+PASS1_BITS+3) |
4710 | & RANGE_MASK]; | 4710 | & RANGE_MASK]; |
4711 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp13, | 4711 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp13, |
4712 | CONST_BITS+PASS1_BITS+3) | 4712 | CONST_BITS+PASS1_BITS+3) |
4713 | & RANGE_MASK]; | 4713 | & RANGE_MASK]; |
4714 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp14, | 4714 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp14, |
4715 | CONST_BITS+PASS1_BITS+3) | 4715 | CONST_BITS+PASS1_BITS+3) |
4716 | & RANGE_MASK]; | 4716 | & RANGE_MASK]; |
4717 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp14, | 4717 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp14, |
4718 | CONST_BITS+PASS1_BITS+3) | 4718 | CONST_BITS+PASS1_BITS+3) |
4719 | & RANGE_MASK]; | 4719 | & RANGE_MASK]; |
4720 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12, | 4720 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12, |
4721 | CONST_BITS+PASS1_BITS+3) | 4721 | CONST_BITS+PASS1_BITS+3) |
4722 | & RANGE_MASK]; | 4722 | & RANGE_MASK]; |
4723 | 4723 | ||
4724 | wsptr += 5; /* advance pointer to next row */ | 4724 | wsptr += 5; /* advance pointer to next row */ |
4725 | } | 4725 | } |
4726 | } | 4726 | } |
4727 | 4727 | ||
4728 | 4728 | ||
4729 | /* | 4729 | /* |
4730 | * Perform dequantization and inverse DCT on one block of coefficients, | 4730 | * Perform dequantization and inverse DCT on one block of coefficients, |
4731 | * producing a 4x8 output block. | 4731 | * producing a 4x8 output block. |
4732 | * | 4732 | * |
4733 | * 8-point IDCT in pass 1 (columns), 4-point in pass 2 (rows). | 4733 | * 8-point IDCT in pass 1 (columns), 4-point in pass 2 (rows). |
4734 | */ | 4734 | */ |
4735 | 4735 | ||
4736 | GLOBAL(void) | 4736 | GLOBAL(void) |
4737 | jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 4737 | jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
4738 | JCOEFPTR coef_block, | 4738 | JCOEFPTR coef_block, |
4739 | JSAMPARRAY output_buf, JDIMENSION output_col) | 4739 | JSAMPARRAY output_buf, JDIMENSION output_col) |
4740 | { | 4740 | { |
4741 | INT32 tmp0, tmp1, tmp2, tmp3; | 4741 | INT32 tmp0, tmp1, tmp2, tmp3; |
4742 | INT32 tmp10, tmp11, tmp12, tmp13; | 4742 | INT32 tmp10, tmp11, tmp12, tmp13; |
4743 | INT32 z1, z2, z3; | 4743 | INT32 z1, z2, z3; |
4744 | JCOEFPTR inptr; | 4744 | JCOEFPTR inptr; |
4745 | ISLOW_MULT_TYPE * quantptr; | 4745 | ISLOW_MULT_TYPE * quantptr; |
4746 | int * wsptr; | 4746 | int * wsptr; |
4747 | JSAMPROW outptr; | 4747 | JSAMPROW outptr; |
4748 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 4748 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
4749 | int ctr; | 4749 | int ctr; |
4750 | int workspace[4*8]; /* buffers data between passes */ | 4750 | int workspace[4*8]; /* buffers data between passes */ |
4751 | SHIFT_TEMPS | 4751 | SHIFT_TEMPS |
4752 | 4752 | ||
4753 | /* Pass 1: process columns from input, store into work array. */ | 4753 | /* Pass 1: process columns from input, store into work array. */ |
4754 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ | 4754 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ |
4755 | /* furthermore, we scale the results by 2**PASS1_BITS. */ | 4755 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
4756 | 4756 | ||
4757 | inptr = coef_block; | 4757 | inptr = coef_block; |
4758 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 4758 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
4759 | wsptr = workspace; | 4759 | wsptr = workspace; |
4760 | for (ctr = 4; ctr > 0; ctr--) { | 4760 | for (ctr = 4; ctr > 0; ctr--) { |
4761 | /* Due to quantization, we will usually find that many of the input | 4761 | /* Due to quantization, we will usually find that many of the input |
4762 | * coefficients are zero, especially the AC terms. We can exploit this | 4762 | * coefficients are zero, especially the AC terms. We can exploit this |
4763 | * by short-circuiting the IDCT calculation for any column in which all | 4763 | * by short-circuiting the IDCT calculation for any column in which all |
4764 | * the AC terms are zero. In that case each output is equal to the | 4764 | * the AC terms are zero. In that case each output is equal to the |
4765 | * DC coefficient (with scale factor as needed). | 4765 | * DC coefficient (with scale factor as needed). |
4766 | * With typical images and quantization tables, half or more of the | 4766 | * With typical images and quantization tables, half or more of the |
4767 | * column DCT calculations can be simplified this way. | 4767 | * column DCT calculations can be simplified this way. |
4768 | */ | 4768 | */ |
4769 | 4769 | ||
4770 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && | 4770 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && |
4771 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && | 4771 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && |
4772 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && | 4772 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && |
4773 | inptr[DCTSIZE*7] == 0) { | 4773 | inptr[DCTSIZE*7] == 0) { |
4774 | /* AC terms all zero */ | 4774 | /* AC terms all zero */ |
4775 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; | 4775 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; |
4776 | 4776 | ||
4777 | wsptr[4*0] = dcval; | 4777 | wsptr[4*0] = dcval; |
4778 | wsptr[4*1] = dcval; | 4778 | wsptr[4*1] = dcval; |
4779 | wsptr[4*2] = dcval; | 4779 | wsptr[4*2] = dcval; |
4780 | wsptr[4*3] = dcval; | 4780 | wsptr[4*3] = dcval; |
4781 | wsptr[4*4] = dcval; | 4781 | wsptr[4*4] = dcval; |
4782 | wsptr[4*5] = dcval; | 4782 | wsptr[4*5] = dcval; |
4783 | wsptr[4*6] = dcval; | 4783 | wsptr[4*6] = dcval; |
4784 | wsptr[4*7] = dcval; | 4784 | wsptr[4*7] = dcval; |
4785 | 4785 | ||
4786 | inptr++; /* advance pointers to next column */ | 4786 | inptr++; /* advance pointers to next column */ |
4787 | quantptr++; | 4787 | quantptr++; |
4788 | wsptr++; | 4788 | wsptr++; |
4789 | continue; | 4789 | continue; |
4790 | } | 4790 | } |
4791 | 4791 | ||
4792 | /* Even part: reverse the even part of the forward DCT. */ | 4792 | /* Even part: reverse the even part of the forward DCT. */ |
4793 | /* The rotator is sqrt(2)*c(-6). */ | 4793 | /* The rotator is sqrt(2)*c(-6). */ |
4794 | 4794 | ||
4795 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 4795 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
4796 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); | 4796 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
4797 | 4797 | ||
4798 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); | 4798 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
4799 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); | 4799 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
4800 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); | 4800 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
4801 | 4801 | ||
4802 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 4802 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
4803 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 4803 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
4804 | z2 <<= CONST_BITS; | 4804 | z2 <<= CONST_BITS; |
4805 | z3 <<= CONST_BITS; | 4805 | z3 <<= CONST_BITS; |
4806 | /* Add fudge factor here for final descale. */ | 4806 | /* Add fudge factor here for final descale. */ |
4807 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); | 4807 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); |
4808 | 4808 | ||
4809 | tmp0 = z2 + z3; | 4809 | tmp0 = z2 + z3; |
4810 | tmp1 = z2 - z3; | 4810 | tmp1 = z2 - z3; |
4811 | 4811 | ||
4812 | tmp10 = tmp0 + tmp2; | 4812 | tmp10 = tmp0 + tmp2; |
4813 | tmp13 = tmp0 - tmp2; | 4813 | tmp13 = tmp0 - tmp2; |
4814 | tmp11 = tmp1 + tmp3; | 4814 | tmp11 = tmp1 + tmp3; |
4815 | tmp12 = tmp1 - tmp3; | 4815 | tmp12 = tmp1 - tmp3; |
4816 | 4816 | ||
4817 | /* Odd part per figure 8; the matrix is unitary and hence its | 4817 | /* Odd part per figure 8; the matrix is unitary and hence its |
4818 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. | 4818 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
4819 | */ | 4819 | */ |
4820 | 4820 | ||
4821 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); | 4821 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
4822 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 4822 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
4823 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 4823 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
4824 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 4824 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
4825 | 4825 | ||
4826 | z2 = tmp0 + tmp2; | 4826 | z2 = tmp0 + tmp2; |
4827 | z3 = tmp1 + tmp3; | 4827 | z3 = tmp1 + tmp3; |
4828 | 4828 | ||
4829 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ | 4829 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
4830 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ | 4830 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
4831 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ | 4831 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
4832 | z2 += z1; | 4832 | z2 += z1; |
4833 | z3 += z1; | 4833 | z3 += z1; |
4834 | 4834 | ||
4835 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ | 4835 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
4836 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ | 4836 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
4837 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ | 4837 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
4838 | tmp0 += z1 + z2; | 4838 | tmp0 += z1 + z2; |
4839 | tmp3 += z1 + z3; | 4839 | tmp3 += z1 + z3; |
4840 | 4840 | ||
4841 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ | 4841 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
4842 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ | 4842 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
4843 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ | 4843 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
4844 | tmp1 += z1 + z3; | 4844 | tmp1 += z1 + z3; |
4845 | tmp2 += z1 + z2; | 4845 | tmp2 += z1 + z2; |
4846 | 4846 | ||
4847 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ | 4847 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
4848 | 4848 | ||
4849 | wsptr[4*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); | 4849 | wsptr[4*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); |
4850 | wsptr[4*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); | 4850 | wsptr[4*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); |
4851 | wsptr[4*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); | 4851 | wsptr[4*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); |
4852 | wsptr[4*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); | 4852 | wsptr[4*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); |
4853 | wsptr[4*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); | 4853 | wsptr[4*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); |
4854 | wsptr[4*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); | 4854 | wsptr[4*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); |
4855 | wsptr[4*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); | 4855 | wsptr[4*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); |
4856 | wsptr[4*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); | 4856 | wsptr[4*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); |
4857 | 4857 | ||
4858 | inptr++; /* advance pointers to next column */ | 4858 | inptr++; /* advance pointers to next column */ |
4859 | quantptr++; | 4859 | quantptr++; |
4860 | wsptr++; | 4860 | wsptr++; |
4861 | } | 4861 | } |
4862 | 4862 | ||
4863 | /* Pass 2: process 8 rows from work array, store into output array. | 4863 | /* Pass 2: process 8 rows from work array, store into output array. |
4864 | * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16). | 4864 | * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
4865 | */ | 4865 | */ |
4866 | wsptr = workspace; | 4866 | wsptr = workspace; |
4867 | for (ctr = 0; ctr < 8; ctr++) { | 4867 | for (ctr = 0; ctr < 8; ctr++) { |
4868 | outptr = output_buf[ctr] + output_col; | 4868 | outptr = output_buf[ctr] + output_col; |
4869 | 4869 | ||
4870 | /* Even part */ | 4870 | /* Even part */ |
4871 | 4871 | ||
4872 | /* Add fudge factor here for final descale. */ | 4872 | /* Add fudge factor here for final descale. */ |
4873 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 4873 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
4874 | tmp2 = (INT32) wsptr[2]; | 4874 | tmp2 = (INT32) wsptr[2]; |
4875 | 4875 | ||
4876 | tmp10 = (tmp0 + tmp2) << CONST_BITS; | 4876 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
4877 | tmp12 = (tmp0 - tmp2) << CONST_BITS; | 4877 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
4878 | 4878 | ||
4879 | /* Odd part */ | 4879 | /* Odd part */ |
4880 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ | 4880 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
4881 | 4881 | ||
4882 | z2 = (INT32) wsptr[1]; | 4882 | z2 = (INT32) wsptr[1]; |
4883 | z3 = (INT32) wsptr[3]; | 4883 | z3 = (INT32) wsptr[3]; |
4884 | 4884 | ||
4885 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ | 4885 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
4886 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ | 4886 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
4887 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ | 4887 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
4888 | 4888 | ||
4889 | /* Final output stage */ | 4889 | /* Final output stage */ |
4890 | 4890 | ||
4891 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 4891 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
4892 | CONST_BITS+PASS1_BITS+3) | 4892 | CONST_BITS+PASS1_BITS+3) |
4893 | & RANGE_MASK]; | 4893 | & RANGE_MASK]; |
4894 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 4894 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
4895 | CONST_BITS+PASS1_BITS+3) | 4895 | CONST_BITS+PASS1_BITS+3) |
4896 | & RANGE_MASK]; | 4896 | & RANGE_MASK]; |
4897 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, | 4897 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
4898 | CONST_BITS+PASS1_BITS+3) | 4898 | CONST_BITS+PASS1_BITS+3) |
4899 | & RANGE_MASK]; | 4899 | & RANGE_MASK]; |
4900 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, | 4900 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
4901 | CONST_BITS+PASS1_BITS+3) | 4901 | CONST_BITS+PASS1_BITS+3) |
4902 | & RANGE_MASK]; | 4902 | & RANGE_MASK]; |
4903 | 4903 | ||
4904 | wsptr += 4; /* advance pointer to next row */ | 4904 | wsptr += 4; /* advance pointer to next row */ |
4905 | } | 4905 | } |
4906 | } | 4906 | } |
4907 | 4907 | ||
4908 | 4908 | ||
4909 | /* | 4909 | /* |
4910 | * Perform dequantization and inverse DCT on one block of coefficients, | 4910 | * Perform dequantization and inverse DCT on one block of coefficients, |
4911 | * producing a reduced-size 3x6 output block. | 4911 | * producing a reduced-size 3x6 output block. |
4912 | * | 4912 | * |
4913 | * 6-point IDCT in pass 1 (columns), 3-point in pass 2 (rows). | 4913 | * 6-point IDCT in pass 1 (columns), 3-point in pass 2 (rows). |
4914 | */ | 4914 | */ |
4915 | 4915 | ||
4916 | GLOBAL(void) | 4916 | GLOBAL(void) |
4917 | jpeg_idct_3x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 4917 | jpeg_idct_3x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
4918 | JCOEFPTR coef_block, | 4918 | JCOEFPTR coef_block, |
4919 | JSAMPARRAY output_buf, JDIMENSION output_col) | 4919 | JSAMPARRAY output_buf, JDIMENSION output_col) |
4920 | { | 4920 | { |
4921 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; | 4921 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; |
4922 | INT32 z1, z2, z3; | 4922 | INT32 z1, z2, z3; |
4923 | JCOEFPTR inptr; | 4923 | JCOEFPTR inptr; |
4924 | ISLOW_MULT_TYPE * quantptr; | 4924 | ISLOW_MULT_TYPE * quantptr; |
4925 | int * wsptr; | 4925 | int * wsptr; |
4926 | JSAMPROW outptr; | 4926 | JSAMPROW outptr; |
4927 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 4927 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
4928 | int ctr; | 4928 | int ctr; |
4929 | int workspace[3*6]; /* buffers data between passes */ | 4929 | int workspace[3*6]; /* buffers data between passes */ |
4930 | SHIFT_TEMPS | 4930 | SHIFT_TEMPS |
4931 | 4931 | ||
4932 | /* Pass 1: process columns from input, store into work array. | 4932 | /* Pass 1: process columns from input, store into work array. |
4933 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). | 4933 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
4934 | */ | 4934 | */ |
4935 | inptr = coef_block; | 4935 | inptr = coef_block; |
4936 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 4936 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
4937 | wsptr = workspace; | 4937 | wsptr = workspace; |
4938 | for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { | 4938 | for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { |
4939 | /* Even part */ | 4939 | /* Even part */ |
4940 | 4940 | ||
4941 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 4941 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
4942 | tmp0 <<= CONST_BITS; | 4942 | tmp0 <<= CONST_BITS; |
4943 | /* Add fudge factor here for final descale. */ | 4943 | /* Add fudge factor here for final descale. */ |
4944 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); | 4944 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
4945 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); | 4945 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
4946 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ | 4946 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
4947 | tmp1 = tmp0 + tmp10; | 4947 | tmp1 = tmp0 + tmp10; |
4948 | tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS); | 4948 | tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS); |
4949 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 4949 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
4950 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ | 4950 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
4951 | tmp10 = tmp1 + tmp0; | 4951 | tmp10 = tmp1 + tmp0; |
4952 | tmp12 = tmp1 - tmp0; | 4952 | tmp12 = tmp1 - tmp0; |
4953 | 4953 | ||
4954 | /* Odd part */ | 4954 | /* Odd part */ |
4955 | 4955 | ||
4956 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 4956 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
4957 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 4957 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
4958 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); | 4958 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
4959 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ | 4959 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
4960 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); | 4960 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
4961 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); | 4961 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
4962 | tmp1 = (z1 - z2 - z3) << PASS1_BITS; | 4962 | tmp1 = (z1 - z2 - z3) << PASS1_BITS; |
4963 | 4963 | ||
4964 | /* Final output stage */ | 4964 | /* Final output stage */ |
4965 | 4965 | ||
4966 | wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); | 4966 | wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
4967 | wsptr[3*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); | 4967 | wsptr[3*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
4968 | wsptr[3*1] = (int) (tmp11 + tmp1); | 4968 | wsptr[3*1] = (int) (tmp11 + tmp1); |
4969 | wsptr[3*4] = (int) (tmp11 - tmp1); | 4969 | wsptr[3*4] = (int) (tmp11 - tmp1); |
4970 | wsptr[3*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); | 4970 | wsptr[3*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
4971 | wsptr[3*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); | 4971 | wsptr[3*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
4972 | } | 4972 | } |
4973 | 4973 | ||
4974 | /* Pass 2: process 6 rows from work array, store into output array. | 4974 | /* Pass 2: process 6 rows from work array, store into output array. |
4975 | * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6). | 4975 | * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6). |
4976 | */ | 4976 | */ |
4977 | wsptr = workspace; | 4977 | wsptr = workspace; |
4978 | for (ctr = 0; ctr < 6; ctr++) { | 4978 | for (ctr = 0; ctr < 6; ctr++) { |
4979 | outptr = output_buf[ctr] + output_col; | 4979 | outptr = output_buf[ctr] + output_col; |
4980 | 4980 | ||
4981 | /* Even part */ | 4981 | /* Even part */ |
4982 | 4982 | ||
4983 | /* Add fudge factor here for final descale. */ | 4983 | /* Add fudge factor here for final descale. */ |
4984 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); | 4984 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
4985 | tmp0 <<= CONST_BITS; | 4985 | tmp0 <<= CONST_BITS; |
4986 | tmp2 = (INT32) wsptr[2]; | 4986 | tmp2 = (INT32) wsptr[2]; |
4987 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ | 4987 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
4988 | tmp10 = tmp0 + tmp12; | 4988 | tmp10 = tmp0 + tmp12; |
4989 | tmp2 = tmp0 - tmp12 - tmp12; | 4989 | tmp2 = tmp0 - tmp12 - tmp12; |
4990 | 4990 | ||
4991 | /* Odd part */ | 4991 | /* Odd part */ |
4992 | 4992 | ||
4993 | tmp12 = (INT32) wsptr[1]; | 4993 | tmp12 = (INT32) wsptr[1]; |
4994 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ | 4994 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
4995 | 4995 | ||
4996 | /* Final output stage */ | 4996 | /* Final output stage */ |
4997 | 4997 | ||
4998 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, | 4998 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
4999 | CONST_BITS+PASS1_BITS+3) | 4999 | CONST_BITS+PASS1_BITS+3) |
5000 | & RANGE_MASK]; | 5000 | & RANGE_MASK]; |
5001 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, | 5001 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
5002 | CONST_BITS+PASS1_BITS+3) | 5002 | CONST_BITS+PASS1_BITS+3) |
5003 | & RANGE_MASK]; | 5003 | & RANGE_MASK]; |
5004 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2, | 5004 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2, |
5005 | CONST_BITS+PASS1_BITS+3) | 5005 | CONST_BITS+PASS1_BITS+3) |
5006 | & RANGE_MASK]; | 5006 | & RANGE_MASK]; |
5007 | 5007 | ||
5008 | wsptr += 3; /* advance pointer to next row */ | 5008 | wsptr += 3; /* advance pointer to next row */ |
5009 | } | 5009 | } |
5010 | } | 5010 | } |
5011 | 5011 | ||
5012 | 5012 | ||
5013 | /* | 5013 | /* |
5014 | * Perform dequantization and inverse DCT on one block of coefficients, | 5014 | * Perform dequantization and inverse DCT on one block of coefficients, |
5015 | * producing a 2x4 output block. | 5015 | * producing a 2x4 output block. |
5016 | * | 5016 | * |
5017 | * 4-point IDCT in pass 1 (columns), 2-point in pass 2 (rows). | 5017 | * 4-point IDCT in pass 1 (columns), 2-point in pass 2 (rows). |
5018 | */ | 5018 | */ |
5019 | 5019 | ||
5020 | GLOBAL(void) | 5020 | GLOBAL(void) |
5021 | jpeg_idct_2x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 5021 | jpeg_idct_2x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
5022 | JCOEFPTR coef_block, | 5022 | JCOEFPTR coef_block, |
5023 | JSAMPARRAY output_buf, JDIMENSION output_col) | 5023 | JSAMPARRAY output_buf, JDIMENSION output_col) |
5024 | { | 5024 | { |
5025 | INT32 tmp0, tmp2, tmp10, tmp12; | 5025 | INT32 tmp0, tmp2, tmp10, tmp12; |
5026 | INT32 z1, z2, z3; | 5026 | INT32 z1, z2, z3; |
5027 | JCOEFPTR inptr; | 5027 | JCOEFPTR inptr; |
5028 | ISLOW_MULT_TYPE * quantptr; | 5028 | ISLOW_MULT_TYPE * quantptr; |
5029 | INT32 * wsptr; | 5029 | INT32 * wsptr; |
5030 | JSAMPROW outptr; | 5030 | JSAMPROW outptr; |
5031 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 5031 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
5032 | int ctr; | 5032 | int ctr; |
5033 | INT32 workspace[2*4]; /* buffers data between passes */ | 5033 | INT32 workspace[2*4]; /* buffers data between passes */ |
5034 | SHIFT_TEMPS | 5034 | SHIFT_TEMPS |
5035 | 5035 | ||
5036 | /* Pass 1: process columns from input, store into work array. | 5036 | /* Pass 1: process columns from input, store into work array. |
5037 | * 4-point IDCT kernel, | 5037 | * 4-point IDCT kernel, |
5038 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. | 5038 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. |
5039 | */ | 5039 | */ |
5040 | inptr = coef_block; | 5040 | inptr = coef_block; |
5041 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 5041 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
5042 | wsptr = workspace; | 5042 | wsptr = workspace; |
5043 | for (ctr = 0; ctr < 2; ctr++, inptr++, quantptr++, wsptr++) { | 5043 | for (ctr = 0; ctr < 2; ctr++, inptr++, quantptr++, wsptr++) { |
5044 | /* Even part */ | 5044 | /* Even part */ |
5045 | 5045 | ||
5046 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); | 5046 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
5047 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); | 5047 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
5048 | 5048 | ||
5049 | tmp10 = (tmp0 + tmp2) << CONST_BITS; | 5049 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
5050 | tmp12 = (tmp0 - tmp2) << CONST_BITS; | 5050 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
5051 | 5051 | ||
5052 | /* Odd part */ | 5052 | /* Odd part */ |
5053 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ | 5053 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
5054 | 5054 | ||
5055 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); | 5055 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
5056 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); | 5056 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
5057 | 5057 | ||
5058 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ | 5058 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
5059 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ | 5059 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
5060 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ | 5060 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
5061 | 5061 | ||
5062 | /* Final output stage */ | 5062 | /* Final output stage */ |
5063 | 5063 | ||
5064 | wsptr[2*0] = tmp10 + tmp0; | 5064 | wsptr[2*0] = tmp10 + tmp0; |
5065 | wsptr[2*3] = tmp10 - tmp0; | 5065 | wsptr[2*3] = tmp10 - tmp0; |
5066 | wsptr[2*1] = tmp12 + tmp2; | 5066 | wsptr[2*1] = tmp12 + tmp2; |
5067 | wsptr[2*2] = tmp12 - tmp2; | 5067 | wsptr[2*2] = tmp12 - tmp2; |
5068 | } | 5068 | } |
5069 | 5069 | ||
5070 | /* Pass 2: process 4 rows from work array, store into output array. */ | 5070 | /* Pass 2: process 4 rows from work array, store into output array. */ |
5071 | 5071 | ||
5072 | wsptr = workspace; | 5072 | wsptr = workspace; |
5073 | for (ctr = 0; ctr < 4; ctr++) { | 5073 | for (ctr = 0; ctr < 4; ctr++) { |
5074 | outptr = output_buf[ctr] + output_col; | 5074 | outptr = output_buf[ctr] + output_col; |
5075 | 5075 | ||
5076 | /* Even part */ | 5076 | /* Even part */ |
5077 | 5077 | ||
5078 | /* Add fudge factor here for final descale. */ | 5078 | /* Add fudge factor here for final descale. */ |
5079 | tmp10 = wsptr[0] + (ONE << (CONST_BITS+2)); | 5079 | tmp10 = wsptr[0] + (ONE << (CONST_BITS+2)); |
5080 | 5080 | ||
5081 | /* Odd part */ | 5081 | /* Odd part */ |
5082 | 5082 | ||
5083 | tmp0 = wsptr[1]; | 5083 | tmp0 = wsptr[1]; |
5084 | 5084 | ||
5085 | /* Final output stage */ | 5085 | /* Final output stage */ |
5086 | 5086 | ||
5087 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS+3) | 5087 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS+3) |
5088 | & RANGE_MASK]; | 5088 | & RANGE_MASK]; |
5089 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS+3) | 5089 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS+3) |
5090 | & RANGE_MASK]; | 5090 | & RANGE_MASK]; |
5091 | 5091 | ||
5092 | wsptr += 2; /* advance pointer to next row */ | 5092 | wsptr += 2; /* advance pointer to next row */ |
5093 | } | 5093 | } |
5094 | } | 5094 | } |
5095 | 5095 | ||
5096 | 5096 | ||
5097 | /* | 5097 | /* |
5098 | * Perform dequantization and inverse DCT on one block of coefficients, | 5098 | * Perform dequantization and inverse DCT on one block of coefficients, |
5099 | * producing a 1x2 output block. | 5099 | * producing a 1x2 output block. |
5100 | * | 5100 | * |
5101 | * 2-point IDCT in pass 1 (columns), 1-point in pass 2 (rows). | 5101 | * 2-point IDCT in pass 1 (columns), 1-point in pass 2 (rows). |
5102 | */ | 5102 | */ |
5103 | 5103 | ||
5104 | GLOBAL(void) | 5104 | GLOBAL(void) |
5105 | jpeg_idct_1x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, | 5105 | jpeg_idct_1x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
5106 | JCOEFPTR coef_block, | 5106 | JCOEFPTR coef_block, |
5107 | JSAMPARRAY output_buf, JDIMENSION output_col) | 5107 | JSAMPARRAY output_buf, JDIMENSION output_col) |
5108 | { | 5108 | { |
5109 | INT32 tmp0, tmp10; | 5109 | INT32 tmp0, tmp10; |
5110 | ISLOW_MULT_TYPE * quantptr; | 5110 | ISLOW_MULT_TYPE * quantptr; |
5111 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); | 5111 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
5112 | SHIFT_TEMPS | 5112 | SHIFT_TEMPS |
5113 | 5113 | ||
5114 | /* Process 1 column from input, store into output array. */ | 5114 | /* Process 1 column from input, store into output array. */ |
5115 | 5115 | ||
5116 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; | 5116 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
5117 | 5117 | ||
5118 | /* Even part */ | 5118 | /* Even part */ |
5119 | 5119 | ||
5120 | tmp10 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]); | 5120 | tmp10 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]); |
5121 | /* Add fudge factor here for final descale. */ | 5121 | /* Add fudge factor here for final descale. */ |
5122 | tmp10 += ONE << 2; | 5122 | tmp10 += ONE << 2; |
5123 | 5123 | ||
5124 | /* Odd part */ | 5124 | /* Odd part */ |
5125 | 5125 | ||
5126 | tmp0 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]); | 5126 | tmp0 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]); |
5127 | 5127 | ||
5128 | /* Final output stage */ | 5128 | /* Final output stage */ |
5129 | 5129 | ||
5130 | output_buf[0][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) | 5130 | output_buf[0][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) |
5131 | & RANGE_MASK]; | 5131 | & RANGE_MASK]; |
5132 | output_buf[1][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) | 5132 | output_buf[1][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) |
5133 | & RANGE_MASK]; | 5133 | & RANGE_MASK]; |
5134 | } | 5134 | } |
5135 | 5135 | ||
5136 | #endif /* IDCT_SCALING_SUPPORTED */ | 5136 | #endif /* IDCT_SCALING_SUPPORTED */ |
5137 | #endif /* DCT_ISLOW_SUPPORTED */ | 5137 | #endif /* DCT_ISLOW_SUPPORTED */ |