diff options
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jccoefct.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jccoefct.c | 908 |
1 files changed, 454 insertions, 454 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jccoefct.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jccoefct.c index b64b46e..924a703 100644 --- a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jccoefct.c +++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jccoefct.c | |||
@@ -1,454 +1,454 @@ | |||
1 | /* | 1 | /* |
2 | * jccoefct.c | 2 | * jccoefct.c |
3 | * | 3 | * |
4 | * Copyright (C) 1994-1997, Thomas G. Lane. | 4 | * Copyright (C) 1994-1997, Thomas G. Lane. |
5 | * Modified 2003-2011 by Guido Vollbeding. | 5 | * Modified 2003-2011 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 the coefficient buffer controller for compression. | 9 | * This file contains the coefficient buffer controller for compression. |
10 | * This controller is the top level of the JPEG compressor proper. | 10 | * This controller is the top level of the JPEG compressor proper. |
11 | * The coefficient buffer lies between forward-DCT and entropy encoding steps. | 11 | * The coefficient buffer lies between forward-DCT and entropy encoding steps. |
12 | */ | 12 | */ |
13 | 13 | ||
14 | #define JPEG_INTERNALS | 14 | #define JPEG_INTERNALS |
15 | #include "jinclude.h" | 15 | #include "jinclude.h" |
16 | #include "jpeglib.h" | 16 | #include "jpeglib.h" |
17 | 17 | ||
18 | 18 | ||
19 | /* We use a full-image coefficient buffer when doing Huffman optimization, | 19 | /* We use a full-image coefficient buffer when doing Huffman optimization, |
20 | * and also for writing multiple-scan JPEG files. In all cases, the DCT | 20 | * and also for writing multiple-scan JPEG files. In all cases, the DCT |
21 | * step is run during the first pass, and subsequent passes need only read | 21 | * step is run during the first pass, and subsequent passes need only read |
22 | * the buffered coefficients. | 22 | * the buffered coefficients. |
23 | */ | 23 | */ |
24 | #ifdef ENTROPY_OPT_SUPPORTED | 24 | #ifdef ENTROPY_OPT_SUPPORTED |
25 | #define FULL_COEF_BUFFER_SUPPORTED | 25 | #define FULL_COEF_BUFFER_SUPPORTED |
26 | #else | 26 | #else |
27 | #ifdef C_MULTISCAN_FILES_SUPPORTED | 27 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
28 | #define FULL_COEF_BUFFER_SUPPORTED | 28 | #define FULL_COEF_BUFFER_SUPPORTED |
29 | #endif | 29 | #endif |
30 | #endif | 30 | #endif |
31 | 31 | ||
32 | 32 | ||
33 | /* Private buffer controller object */ | 33 | /* Private buffer controller object */ |
34 | 34 | ||
35 | typedef struct { | 35 | typedef struct { |
36 | struct jpeg_c_coef_controller pub; /* public fields */ | 36 | struct jpeg_c_coef_controller pub; /* public fields */ |
37 | 37 | ||
38 | JDIMENSION iMCU_row_num; /* iMCU row # within image */ | 38 | JDIMENSION iMCU_row_num; /* iMCU row # within image */ |
39 | JDIMENSION mcu_ctr; /* counts MCUs processed in current row */ | 39 | JDIMENSION mcu_ctr; /* counts MCUs processed in current row */ |
40 | int MCU_vert_offset; /* counts MCU rows within iMCU row */ | 40 | int MCU_vert_offset; /* counts MCU rows within iMCU row */ |
41 | int MCU_rows_per_iMCU_row; /* number of such rows needed */ | 41 | int MCU_rows_per_iMCU_row; /* number of such rows needed */ |
42 | 42 | ||
43 | /* For single-pass compression, it's sufficient to buffer just one MCU | 43 | /* For single-pass compression, it's sufficient to buffer just one MCU |
44 | * (although this may prove a bit slow in practice). We allocate a | 44 | * (although this may prove a bit slow in practice). We allocate a |
45 | * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each | 45 | * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each |
46 | * MCU constructed and sent. (On 80x86, the workspace is FAR even though | 46 | * MCU constructed and sent. (On 80x86, the workspace is FAR even though |
47 | * it's not really very big; this is to keep the module interfaces unchanged | 47 | * it's not really very big; this is to keep the module interfaces unchanged |
48 | * when a large coefficient buffer is necessary.) | 48 | * when a large coefficient buffer is necessary.) |
49 | * In multi-pass modes, this array points to the current MCU's blocks | 49 | * In multi-pass modes, this array points to the current MCU's blocks |
50 | * within the virtual arrays. | 50 | * within the virtual arrays. |
51 | */ | 51 | */ |
52 | JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; | 52 | JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; |
53 | 53 | ||
54 | /* In multi-pass modes, we need a virtual block array for each component. */ | 54 | /* In multi-pass modes, we need a virtual block array for each component. */ |
55 | jvirt_barray_ptr whole_image[MAX_COMPONENTS]; | 55 | jvirt_barray_ptr whole_image[MAX_COMPONENTS]; |
56 | } my_coef_controller; | 56 | } my_coef_controller; |
57 | 57 | ||
58 | typedef my_coef_controller * my_coef_ptr; | 58 | typedef my_coef_controller * my_coef_ptr; |
59 | 59 | ||
60 | 60 | ||
61 | /* Forward declarations */ | 61 | /* Forward declarations */ |
62 | METHODDEF(boolean) compress_data | 62 | METHODDEF(boolean) compress_data |
63 | JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); | 63 | JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); |
64 | #ifdef FULL_COEF_BUFFER_SUPPORTED | 64 | #ifdef FULL_COEF_BUFFER_SUPPORTED |
65 | METHODDEF(boolean) compress_first_pass | 65 | METHODDEF(boolean) compress_first_pass |
66 | JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); | 66 | JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); |
67 | METHODDEF(boolean) compress_output | 67 | METHODDEF(boolean) compress_output |
68 | JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); | 68 | JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); |
69 | #endif | 69 | #endif |
70 | 70 | ||
71 | 71 | ||
72 | LOCAL(void) | 72 | LOCAL(void) |
73 | start_iMCU_row (j_compress_ptr cinfo) | 73 | start_iMCU_row (j_compress_ptr cinfo) |
74 | /* Reset within-iMCU-row counters for a new row */ | 74 | /* Reset within-iMCU-row counters for a new row */ |
75 | { | 75 | { |
76 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | 76 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
77 | 77 | ||
78 | /* In an interleaved scan, an MCU row is the same as an iMCU row. | 78 | /* In an interleaved scan, an MCU row is the same as an iMCU row. |
79 | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. | 79 | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. |
80 | * But at the bottom of the image, process only what's left. | 80 | * But at the bottom of the image, process only what's left. |
81 | */ | 81 | */ |
82 | if (cinfo->comps_in_scan > 1) { | 82 | if (cinfo->comps_in_scan > 1) { |
83 | coef->MCU_rows_per_iMCU_row = 1; | 83 | coef->MCU_rows_per_iMCU_row = 1; |
84 | } else { | 84 | } else { |
85 | if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) | 85 | if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) |
86 | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; | 86 | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; |
87 | else | 87 | else |
88 | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; | 88 | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; |
89 | } | 89 | } |
90 | 90 | ||
91 | coef->mcu_ctr = 0; | 91 | coef->mcu_ctr = 0; |
92 | coef->MCU_vert_offset = 0; | 92 | coef->MCU_vert_offset = 0; |
93 | } | 93 | } |
94 | 94 | ||
95 | 95 | ||
96 | /* | 96 | /* |
97 | * Initialize for a processing pass. | 97 | * Initialize for a processing pass. |
98 | */ | 98 | */ |
99 | 99 | ||
100 | METHODDEF(void) | 100 | METHODDEF(void) |
101 | start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) | 101 | start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) |
102 | { | 102 | { |
103 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | 103 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
104 | 104 | ||
105 | coef->iMCU_row_num = 0; | 105 | coef->iMCU_row_num = 0; |
106 | start_iMCU_row(cinfo); | 106 | start_iMCU_row(cinfo); |
107 | 107 | ||
108 | switch (pass_mode) { | 108 | switch (pass_mode) { |
109 | case JBUF_PASS_THRU: | 109 | case JBUF_PASS_THRU: |
110 | if (coef->whole_image[0] != NULL) | 110 | if (coef->whole_image[0] != NULL) |
111 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | 111 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
112 | coef->pub.compress_data = compress_data; | 112 | coef->pub.compress_data = compress_data; |
113 | break; | 113 | break; |
114 | #ifdef FULL_COEF_BUFFER_SUPPORTED | 114 | #ifdef FULL_COEF_BUFFER_SUPPORTED |
115 | case JBUF_SAVE_AND_PASS: | 115 | case JBUF_SAVE_AND_PASS: |
116 | if (coef->whole_image[0] == NULL) | 116 | if (coef->whole_image[0] == NULL) |
117 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | 117 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
118 | coef->pub.compress_data = compress_first_pass; | 118 | coef->pub.compress_data = compress_first_pass; |
119 | break; | 119 | break; |
120 | case JBUF_CRANK_DEST: | 120 | case JBUF_CRANK_DEST: |
121 | if (coef->whole_image[0] == NULL) | 121 | if (coef->whole_image[0] == NULL) |
122 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | 122 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
123 | coef->pub.compress_data = compress_output; | 123 | coef->pub.compress_data = compress_output; |
124 | break; | 124 | break; |
125 | #endif | 125 | #endif |
126 | default: | 126 | default: |
127 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | 127 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
128 | break; | 128 | break; |
129 | } | 129 | } |
130 | } | 130 | } |
131 | 131 | ||
132 | 132 | ||
133 | /* | 133 | /* |
134 | * Process some data in the single-pass case. | 134 | * Process some data in the single-pass case. |
135 | * We process the equivalent of one fully interleaved MCU row ("iMCU" row) | 135 | * We process the equivalent of one fully interleaved MCU row ("iMCU" row) |
136 | * per call, ie, v_samp_factor block rows for each component in the image. | 136 | * per call, ie, v_samp_factor block rows for each component in the image. |
137 | * Returns TRUE if the iMCU row is completed, FALSE if suspended. | 137 | * Returns TRUE if the iMCU row is completed, FALSE if suspended. |
138 | * | 138 | * |
139 | * NB: input_buf contains a plane for each component in image, | 139 | * NB: input_buf contains a plane for each component in image, |
140 | * which we index according to the component's SOF position. | 140 | * which we index according to the component's SOF position. |
141 | */ | 141 | */ |
142 | 142 | ||
143 | METHODDEF(boolean) | 143 | METHODDEF(boolean) |
144 | compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf) | 144 | compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf) |
145 | { | 145 | { |
146 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | 146 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
147 | JDIMENSION MCU_col_num; /* index of current MCU within row */ | 147 | JDIMENSION MCU_col_num; /* index of current MCU within row */ |
148 | JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; | 148 | JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; |
149 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; | 149 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; |
150 | int blkn, bi, ci, yindex, yoffset, blockcnt; | 150 | int blkn, bi, ci, yindex, yoffset, blockcnt; |
151 | JDIMENSION ypos, xpos; | 151 | JDIMENSION ypos, xpos; |
152 | jpeg_component_info *compptr; | 152 | jpeg_component_info *compptr; |
153 | forward_DCT_ptr forward_DCT; | 153 | forward_DCT_ptr forward_DCT; |
154 | 154 | ||
155 | /* Loop to write as much as one whole iMCU row */ | 155 | /* Loop to write as much as one whole iMCU row */ |
156 | for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; | 156 | for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; |
157 | yoffset++) { | 157 | yoffset++) { |
158 | for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col; | 158 | for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col; |
159 | MCU_col_num++) { | 159 | MCU_col_num++) { |
160 | /* Determine where data comes from in input_buf and do the DCT thing. | 160 | /* Determine where data comes from in input_buf and do the DCT thing. |
161 | * Each call on forward_DCT processes a horizontal row of DCT blocks | 161 | * Each call on forward_DCT processes a horizontal row of DCT blocks |
162 | * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks | 162 | * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks |
163 | * sequentially. Dummy blocks at the right or bottom edge are filled in | 163 | * sequentially. Dummy blocks at the right or bottom edge are filled in |
164 | * specially. The data in them does not matter for image reconstruction, | 164 | * specially. The data in them does not matter for image reconstruction, |
165 | * so we fill them with values that will encode to the smallest amount of | 165 | * so we fill them with values that will encode to the smallest amount of |
166 | * data, viz: all zeroes in the AC entries, DC entries equal to previous | 166 | * data, viz: all zeroes in the AC entries, DC entries equal to previous |
167 | * block's DC value. (Thanks to Thomas Kinsman for this idea.) | 167 | * block's DC value. (Thanks to Thomas Kinsman for this idea.) |
168 | */ | 168 | */ |
169 | blkn = 0; | 169 | blkn = 0; |
170 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { | 170 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
171 | compptr = cinfo->cur_comp_info[ci]; | 171 | compptr = cinfo->cur_comp_info[ci]; |
172 | forward_DCT = cinfo->fdct->forward_DCT[compptr->component_index]; | 172 | forward_DCT = cinfo->fdct->forward_DCT[compptr->component_index]; |
173 | blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width | 173 | blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width |
174 | : compptr->last_col_width; | 174 | : compptr->last_col_width; |
175 | xpos = MCU_col_num * compptr->MCU_sample_width; | 175 | xpos = MCU_col_num * compptr->MCU_sample_width; |
176 | ypos = yoffset * compptr->DCT_v_scaled_size; | 176 | ypos = yoffset * compptr->DCT_v_scaled_size; |
177 | /* ypos == (yoffset+yindex) * DCTSIZE */ | 177 | /* ypos == (yoffset+yindex) * DCTSIZE */ |
178 | for (yindex = 0; yindex < compptr->MCU_height; yindex++) { | 178 | for (yindex = 0; yindex < compptr->MCU_height; yindex++) { |
179 | if (coef->iMCU_row_num < last_iMCU_row || | 179 | if (coef->iMCU_row_num < last_iMCU_row || |
180 | yoffset+yindex < compptr->last_row_height) { | 180 | yoffset+yindex < compptr->last_row_height) { |
181 | (*forward_DCT) (cinfo, compptr, | 181 | (*forward_DCT) (cinfo, compptr, |
182 | input_buf[compptr->component_index], | 182 | input_buf[compptr->component_index], |
183 | coef->MCU_buffer[blkn], | 183 | coef->MCU_buffer[blkn], |
184 | ypos, xpos, (JDIMENSION) blockcnt); | 184 | ypos, xpos, (JDIMENSION) blockcnt); |
185 | if (blockcnt < compptr->MCU_width) { | 185 | if (blockcnt < compptr->MCU_width) { |
186 | /* Create some dummy blocks at the right edge of the image. */ | 186 | /* Create some dummy blocks at the right edge of the image. */ |
187 | FMEMZERO((void FAR *) coef->MCU_buffer[blkn + blockcnt], | 187 | FMEMZERO((void FAR *) coef->MCU_buffer[blkn + blockcnt], |
188 | (compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK)); | 188 | (compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK)); |
189 | for (bi = blockcnt; bi < compptr->MCU_width; bi++) { | 189 | for (bi = blockcnt; bi < compptr->MCU_width; bi++) { |
190 | coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0]; | 190 | coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0]; |
191 | } | 191 | } |
192 | } | 192 | } |
193 | } else { | 193 | } else { |
194 | /* Create a row of dummy blocks at the bottom of the image. */ | 194 | /* Create a row of dummy blocks at the bottom of the image. */ |
195 | FMEMZERO((void FAR *) coef->MCU_buffer[blkn], | 195 | FMEMZERO((void FAR *) coef->MCU_buffer[blkn], |
196 | compptr->MCU_width * SIZEOF(JBLOCK)); | 196 | compptr->MCU_width * SIZEOF(JBLOCK)); |
197 | for (bi = 0; bi < compptr->MCU_width; bi++) { | 197 | for (bi = 0; bi < compptr->MCU_width; bi++) { |
198 | coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0]; | 198 | coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0]; |
199 | } | 199 | } |
200 | } | 200 | } |
201 | blkn += compptr->MCU_width; | 201 | blkn += compptr->MCU_width; |
202 | ypos += compptr->DCT_v_scaled_size; | 202 | ypos += compptr->DCT_v_scaled_size; |
203 | } | 203 | } |
204 | } | 204 | } |
205 | /* Try to write the MCU. In event of a suspension failure, we will | 205 | /* Try to write the MCU. In event of a suspension failure, we will |
206 | * re-DCT the MCU on restart (a bit inefficient, could be fixed...) | 206 | * re-DCT the MCU on restart (a bit inefficient, could be fixed...) |
207 | */ | 207 | */ |
208 | if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) { | 208 | if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) { |
209 | /* Suspension forced; update state counters and exit */ | 209 | /* Suspension forced; update state counters and exit */ |
210 | coef->MCU_vert_offset = yoffset; | 210 | coef->MCU_vert_offset = yoffset; |
211 | coef->mcu_ctr = MCU_col_num; | 211 | coef->mcu_ctr = MCU_col_num; |
212 | return FALSE; | 212 | return FALSE; |
213 | } | 213 | } |
214 | } | 214 | } |
215 | /* Completed an MCU row, but perhaps not an iMCU row */ | 215 | /* Completed an MCU row, but perhaps not an iMCU row */ |
216 | coef->mcu_ctr = 0; | 216 | coef->mcu_ctr = 0; |
217 | } | 217 | } |
218 | /* Completed the iMCU row, advance counters for next one */ | 218 | /* Completed the iMCU row, advance counters for next one */ |
219 | coef->iMCU_row_num++; | 219 | coef->iMCU_row_num++; |
220 | start_iMCU_row(cinfo); | 220 | start_iMCU_row(cinfo); |
221 | return TRUE; | 221 | return TRUE; |
222 | } | 222 | } |
223 | 223 | ||
224 | 224 | ||
225 | #ifdef FULL_COEF_BUFFER_SUPPORTED | 225 | #ifdef FULL_COEF_BUFFER_SUPPORTED |
226 | 226 | ||
227 | /* | 227 | /* |
228 | * Process some data in the first pass of a multi-pass case. | 228 | * Process some data in the first pass of a multi-pass case. |
229 | * We process the equivalent of one fully interleaved MCU row ("iMCU" row) | 229 | * We process the equivalent of one fully interleaved MCU row ("iMCU" row) |
230 | * per call, ie, v_samp_factor block rows for each component in the image. | 230 | * per call, ie, v_samp_factor block rows for each component in the image. |
231 | * This amount of data is read from the source buffer, DCT'd and quantized, | 231 | * This amount of data is read from the source buffer, DCT'd and quantized, |
232 | * and saved into the virtual arrays. We also generate suitable dummy blocks | 232 | * and saved into the virtual arrays. We also generate suitable dummy blocks |
233 | * as needed at the right and lower edges. (The dummy blocks are constructed | 233 | * as needed at the right and lower edges. (The dummy blocks are constructed |
234 | * in the virtual arrays, which have been padded appropriately.) This makes | 234 | * in the virtual arrays, which have been padded appropriately.) This makes |
235 | * it possible for subsequent passes not to worry about real vs. dummy blocks. | 235 | * it possible for subsequent passes not to worry about real vs. dummy blocks. |
236 | * | 236 | * |
237 | * We must also emit the data to the entropy encoder. This is conveniently | 237 | * We must also emit the data to the entropy encoder. This is conveniently |
238 | * done by calling compress_output() after we've loaded the current strip | 238 | * done by calling compress_output() after we've loaded the current strip |
239 | * of the virtual arrays. | 239 | * of the virtual arrays. |
240 | * | 240 | * |
241 | * NB: input_buf contains a plane for each component in image. All | 241 | * NB: input_buf contains a plane for each component in image. All |
242 | * components are DCT'd and loaded into the virtual arrays in this pass. | 242 | * components are DCT'd and loaded into the virtual arrays in this pass. |
243 | * However, it may be that only a subset of the components are emitted to | 243 | * However, it may be that only a subset of the components are emitted to |
244 | * the entropy encoder during this first pass; be careful about looking | 244 | * the entropy encoder during this first pass; be careful about looking |
245 | * at the scan-dependent variables (MCU dimensions, etc). | 245 | * at the scan-dependent variables (MCU dimensions, etc). |
246 | */ | 246 | */ |
247 | 247 | ||
248 | METHODDEF(boolean) | 248 | METHODDEF(boolean) |
249 | compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf) | 249 | compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf) |
250 | { | 250 | { |
251 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | 251 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
252 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; | 252 | JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; |
253 | JDIMENSION blocks_across, MCUs_across, MCUindex; | 253 | JDIMENSION blocks_across, MCUs_across, MCUindex; |
254 | int bi, ci, h_samp_factor, block_row, block_rows, ndummy; | 254 | int bi, ci, h_samp_factor, block_row, block_rows, ndummy; |
255 | JCOEF lastDC; | 255 | JCOEF lastDC; |
256 | jpeg_component_info *compptr; | 256 | jpeg_component_info *compptr; |
257 | JBLOCKARRAY buffer; | 257 | JBLOCKARRAY buffer; |
258 | JBLOCKROW thisblockrow, lastblockrow; | 258 | JBLOCKROW thisblockrow, lastblockrow; |
259 | forward_DCT_ptr forward_DCT; | 259 | forward_DCT_ptr forward_DCT; |
260 | 260 | ||
261 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | 261 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
262 | ci++, compptr++) { | 262 | ci++, compptr++) { |
263 | /* Align the virtual buffer for this component. */ | 263 | /* Align the virtual buffer for this component. */ |
264 | buffer = (*cinfo->mem->access_virt_barray) | 264 | buffer = (*cinfo->mem->access_virt_barray) |
265 | ((j_common_ptr) cinfo, coef->whole_image[ci], | 265 | ((j_common_ptr) cinfo, coef->whole_image[ci], |
266 | coef->iMCU_row_num * compptr->v_samp_factor, | 266 | coef->iMCU_row_num * compptr->v_samp_factor, |
267 | (JDIMENSION) compptr->v_samp_factor, TRUE); | 267 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
268 | /* Count non-dummy DCT block rows in this iMCU row. */ | 268 | /* Count non-dummy DCT block rows in this iMCU row. */ |
269 | if (coef->iMCU_row_num < last_iMCU_row) | 269 | if (coef->iMCU_row_num < last_iMCU_row) |
270 | block_rows = compptr->v_samp_factor; | 270 | block_rows = compptr->v_samp_factor; |
271 | else { | 271 | else { |
272 | /* NB: can't use last_row_height here, since may not be set! */ | 272 | /* NB: can't use last_row_height here, since may not be set! */ |
273 | block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); | 273 | block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); |
274 | if (block_rows == 0) block_rows = compptr->v_samp_factor; | 274 | if (block_rows == 0) block_rows = compptr->v_samp_factor; |
275 | } | 275 | } |
276 | blocks_across = compptr->width_in_blocks; | 276 | blocks_across = compptr->width_in_blocks; |
277 | h_samp_factor = compptr->h_samp_factor; | 277 | h_samp_factor = compptr->h_samp_factor; |
278 | /* Count number of dummy blocks to be added at the right margin. */ | 278 | /* Count number of dummy blocks to be added at the right margin. */ |
279 | ndummy = (int) (blocks_across % h_samp_factor); | 279 | ndummy = (int) (blocks_across % h_samp_factor); |
280 | if (ndummy > 0) | 280 | if (ndummy > 0) |
281 | ndummy = h_samp_factor - ndummy; | 281 | ndummy = h_samp_factor - ndummy; |
282 | forward_DCT = cinfo->fdct->forward_DCT[ci]; | 282 | forward_DCT = cinfo->fdct->forward_DCT[ci]; |
283 | /* Perform DCT for all non-dummy blocks in this iMCU row. Each call | 283 | /* Perform DCT for all non-dummy blocks in this iMCU row. Each call |
284 | * on forward_DCT processes a complete horizontal row of DCT blocks. | 284 | * on forward_DCT processes a complete horizontal row of DCT blocks. |
285 | */ | 285 | */ |
286 | for (block_row = 0; block_row < block_rows; block_row++) { | 286 | for (block_row = 0; block_row < block_rows; block_row++) { |
287 | thisblockrow = buffer[block_row]; | 287 | thisblockrow = buffer[block_row]; |
288 | (*forward_DCT) (cinfo, compptr, input_buf[ci], thisblockrow, | 288 | (*forward_DCT) (cinfo, compptr, input_buf[ci], thisblockrow, |
289 | (JDIMENSION) (block_row * compptr->DCT_v_scaled_size), | 289 | (JDIMENSION) (block_row * compptr->DCT_v_scaled_size), |
290 | (JDIMENSION) 0, blocks_across); | 290 | (JDIMENSION) 0, blocks_across); |
291 | if (ndummy > 0) { | 291 | if (ndummy > 0) { |
292 | /* Create dummy blocks at the right edge of the image. */ | 292 | /* Create dummy blocks at the right edge of the image. */ |
293 | thisblockrow += blocks_across; /* => first dummy block */ | 293 | thisblockrow += blocks_across; /* => first dummy block */ |
294 | FMEMZERO((void FAR *) thisblockrow, ndummy * SIZEOF(JBLOCK)); | 294 | FMEMZERO((void FAR *) thisblockrow, ndummy * SIZEOF(JBLOCK)); |
295 | lastDC = thisblockrow[-1][0]; | 295 | lastDC = thisblockrow[-1][0]; |
296 | for (bi = 0; bi < ndummy; bi++) { | 296 | for (bi = 0; bi < ndummy; bi++) { |
297 | thisblockrow[bi][0] = lastDC; | 297 | thisblockrow[bi][0] = lastDC; |
298 | } | 298 | } |
299 | } | 299 | } |
300 | } | 300 | } |
301 | /* If at end of image, create dummy block rows as needed. | 301 | /* If at end of image, create dummy block rows as needed. |
302 | * The tricky part here is that within each MCU, we want the DC values | 302 | * The tricky part here is that within each MCU, we want the DC values |
303 | * of the dummy blocks to match the last real block's DC value. | 303 | * of the dummy blocks to match the last real block's DC value. |
304 | * This squeezes a few more bytes out of the resulting file... | 304 | * This squeezes a few more bytes out of the resulting file... |
305 | */ | 305 | */ |
306 | if (coef->iMCU_row_num == last_iMCU_row) { | 306 | if (coef->iMCU_row_num == last_iMCU_row) { |
307 | blocks_across += ndummy; /* include lower right corner */ | 307 | blocks_across += ndummy; /* include lower right corner */ |
308 | MCUs_across = blocks_across / h_samp_factor; | 308 | MCUs_across = blocks_across / h_samp_factor; |
309 | for (block_row = block_rows; block_row < compptr->v_samp_factor; | 309 | for (block_row = block_rows; block_row < compptr->v_samp_factor; |
310 | block_row++) { | 310 | block_row++) { |
311 | thisblockrow = buffer[block_row]; | 311 | thisblockrow = buffer[block_row]; |
312 | lastblockrow = buffer[block_row-1]; | 312 | lastblockrow = buffer[block_row-1]; |
313 | FMEMZERO((void FAR *) thisblockrow, | 313 | FMEMZERO((void FAR *) thisblockrow, |
314 | (size_t) (blocks_across * SIZEOF(JBLOCK))); | 314 | (size_t) (blocks_across * SIZEOF(JBLOCK))); |
315 | for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) { | 315 | for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) { |
316 | lastDC = lastblockrow[h_samp_factor-1][0]; | 316 | lastDC = lastblockrow[h_samp_factor-1][0]; |
317 | for (bi = 0; bi < h_samp_factor; bi++) { | 317 | for (bi = 0; bi < h_samp_factor; bi++) { |
318 | thisblockrow[bi][0] = lastDC; | 318 | thisblockrow[bi][0] = lastDC; |
319 | } | 319 | } |
320 | thisblockrow += h_samp_factor; /* advance to next MCU in row */ | 320 | thisblockrow += h_samp_factor; /* advance to next MCU in row */ |
321 | lastblockrow += h_samp_factor; | 321 | lastblockrow += h_samp_factor; |
322 | } | 322 | } |
323 | } | 323 | } |
324 | } | 324 | } |
325 | } | 325 | } |
326 | /* NB: compress_output will increment iMCU_row_num if successful. | 326 | /* NB: compress_output will increment iMCU_row_num if successful. |
327 | * A suspension return will result in redoing all the work above next time. | 327 | * A suspension return will result in redoing all the work above next time. |
328 | */ | 328 | */ |
329 | 329 | ||
330 | /* Emit data to the entropy encoder, sharing code with subsequent passes */ | 330 | /* Emit data to the entropy encoder, sharing code with subsequent passes */ |
331 | return compress_output(cinfo, input_buf); | 331 | return compress_output(cinfo, input_buf); |
332 | } | 332 | } |
333 | 333 | ||
334 | 334 | ||
335 | /* | 335 | /* |
336 | * Process some data in subsequent passes of a multi-pass case. | 336 | * Process some data in subsequent passes of a multi-pass case. |
337 | * We process the equivalent of one fully interleaved MCU row ("iMCU" row) | 337 | * We process the equivalent of one fully interleaved MCU row ("iMCU" row) |
338 | * per call, ie, v_samp_factor block rows for each component in the scan. | 338 | * per call, ie, v_samp_factor block rows for each component in the scan. |
339 | * The data is obtained from the virtual arrays and fed to the entropy coder. | 339 | * The data is obtained from the virtual arrays and fed to the entropy coder. |
340 | * Returns TRUE if the iMCU row is completed, FALSE if suspended. | 340 | * Returns TRUE if the iMCU row is completed, FALSE if suspended. |
341 | * | 341 | * |
342 | * NB: input_buf is ignored; it is likely to be a NULL pointer. | 342 | * NB: input_buf is ignored; it is likely to be a NULL pointer. |
343 | */ | 343 | */ |
344 | 344 | ||
345 | METHODDEF(boolean) | 345 | METHODDEF(boolean) |
346 | compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) | 346 | compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) |
347 | { | 347 | { |
348 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | 348 | my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
349 | JDIMENSION MCU_col_num; /* index of current MCU within row */ | 349 | JDIMENSION MCU_col_num; /* index of current MCU within row */ |
350 | int blkn, ci, xindex, yindex, yoffset; | 350 | int blkn, ci, xindex, yindex, yoffset; |
351 | JDIMENSION start_col; | 351 | JDIMENSION start_col; |
352 | JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; | 352 | JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; |
353 | JBLOCKROW buffer_ptr; | 353 | JBLOCKROW buffer_ptr; |
354 | jpeg_component_info *compptr; | 354 | jpeg_component_info *compptr; |
355 | 355 | ||
356 | /* Align the virtual buffers for the components used in this scan. | 356 | /* Align the virtual buffers for the components used in this scan. |
357 | * NB: during first pass, this is safe only because the buffers will | 357 | * NB: during first pass, this is safe only because the buffers will |
358 | * already be aligned properly, so jmemmgr.c won't need to do any I/O. | 358 | * already be aligned properly, so jmemmgr.c won't need to do any I/O. |
359 | */ | 359 | */ |
360 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { | 360 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
361 | compptr = cinfo->cur_comp_info[ci]; | 361 | compptr = cinfo->cur_comp_info[ci]; |
362 | buffer[ci] = (*cinfo->mem->access_virt_barray) | 362 | buffer[ci] = (*cinfo->mem->access_virt_barray) |
363 | ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], | 363 | ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], |
364 | coef->iMCU_row_num * compptr->v_samp_factor, | 364 | coef->iMCU_row_num * compptr->v_samp_factor, |
365 | (JDIMENSION) compptr->v_samp_factor, FALSE); | 365 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
366 | } | 366 | } |
367 | 367 | ||
368 | /* Loop to process one whole iMCU row */ | 368 | /* Loop to process one whole iMCU row */ |
369 | for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; | 369 | for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; |
370 | yoffset++) { | 370 | yoffset++) { |
371 | for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; | 371 | for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; |
372 | MCU_col_num++) { | 372 | MCU_col_num++) { |
373 | /* Construct list of pointers to DCT blocks belonging to this MCU */ | 373 | /* Construct list of pointers to DCT blocks belonging to this MCU */ |
374 | blkn = 0; /* index of current DCT block within MCU */ | 374 | blkn = 0; /* index of current DCT block within MCU */ |
375 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { | 375 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
376 | compptr = cinfo->cur_comp_info[ci]; | 376 | compptr = cinfo->cur_comp_info[ci]; |
377 | start_col = MCU_col_num * compptr->MCU_width; | 377 | start_col = MCU_col_num * compptr->MCU_width; |
378 | for (yindex = 0; yindex < compptr->MCU_height; yindex++) { | 378 | for (yindex = 0; yindex < compptr->MCU_height; yindex++) { |
379 | buffer_ptr = buffer[ci][yindex+yoffset] + start_col; | 379 | buffer_ptr = buffer[ci][yindex+yoffset] + start_col; |
380 | for (xindex = 0; xindex < compptr->MCU_width; xindex++) { | 380 | for (xindex = 0; xindex < compptr->MCU_width; xindex++) { |
381 | coef->MCU_buffer[blkn++] = buffer_ptr++; | 381 | coef->MCU_buffer[blkn++] = buffer_ptr++; |
382 | } | 382 | } |
383 | } | 383 | } |
384 | } | 384 | } |
385 | /* Try to write the MCU. */ | 385 | /* Try to write the MCU. */ |
386 | if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) { | 386 | if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) { |
387 | /* Suspension forced; update state counters and exit */ | 387 | /* Suspension forced; update state counters and exit */ |
388 | coef->MCU_vert_offset = yoffset; | 388 | coef->MCU_vert_offset = yoffset; |
389 | coef->mcu_ctr = MCU_col_num; | 389 | coef->mcu_ctr = MCU_col_num; |
390 | return FALSE; | 390 | return FALSE; |
391 | } | 391 | } |
392 | } | 392 | } |
393 | /* Completed an MCU row, but perhaps not an iMCU row */ | 393 | /* Completed an MCU row, but perhaps not an iMCU row */ |
394 | coef->mcu_ctr = 0; | 394 | coef->mcu_ctr = 0; |
395 | } | 395 | } |
396 | /* Completed the iMCU row, advance counters for next one */ | 396 | /* Completed the iMCU row, advance counters for next one */ |
397 | coef->iMCU_row_num++; | 397 | coef->iMCU_row_num++; |
398 | start_iMCU_row(cinfo); | 398 | start_iMCU_row(cinfo); |
399 | return TRUE; | 399 | return TRUE; |
400 | } | 400 | } |
401 | 401 | ||
402 | #endif /* FULL_COEF_BUFFER_SUPPORTED */ | 402 | #endif /* FULL_COEF_BUFFER_SUPPORTED */ |
403 | 403 | ||
404 | 404 | ||
405 | /* | 405 | /* |
406 | * Initialize coefficient buffer controller. | 406 | * Initialize coefficient buffer controller. |
407 | */ | 407 | */ |
408 | 408 | ||
409 | GLOBAL(void) | 409 | GLOBAL(void) |
410 | jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer) | 410 | jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer) |
411 | { | 411 | { |
412 | my_coef_ptr coef; | 412 | my_coef_ptr coef; |
413 | 413 | ||
414 | coef = (my_coef_ptr) | 414 | coef = (my_coef_ptr) |
415 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | 415 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
416 | SIZEOF(my_coef_controller)); | 416 | SIZEOF(my_coef_controller)); |
417 | cinfo->coef = (struct jpeg_c_coef_controller *) coef; | 417 | cinfo->coef = (struct jpeg_c_coef_controller *) coef; |
418 | coef->pub.start_pass = start_pass_coef; | 418 | coef->pub.start_pass = start_pass_coef; |
419 | 419 | ||
420 | /* Create the coefficient buffer. */ | 420 | /* Create the coefficient buffer. */ |
421 | if (need_full_buffer) { | 421 | if (need_full_buffer) { |
422 | #ifdef FULL_COEF_BUFFER_SUPPORTED | 422 | #ifdef FULL_COEF_BUFFER_SUPPORTED |
423 | /* Allocate a full-image virtual array for each component, */ | 423 | /* Allocate a full-image virtual array for each component, */ |
424 | /* padded to a multiple of samp_factor DCT blocks in each direction. */ | 424 | /* padded to a multiple of samp_factor DCT blocks in each direction. */ |
425 | int ci; | 425 | int ci; |
426 | jpeg_component_info *compptr; | 426 | jpeg_component_info *compptr; |
427 | 427 | ||
428 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | 428 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
429 | ci++, compptr++) { | 429 | ci++, compptr++) { |
430 | coef->whole_image[ci] = (*cinfo->mem->request_virt_barray) | 430 | coef->whole_image[ci] = (*cinfo->mem->request_virt_barray) |
431 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, | 431 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
432 | (JDIMENSION) jround_up((long) compptr->width_in_blocks, | 432 | (JDIMENSION) jround_up((long) compptr->width_in_blocks, |
433 | (long) compptr->h_samp_factor), | 433 | (long) compptr->h_samp_factor), |
434 | (JDIMENSION) jround_up((long) compptr->height_in_blocks, | 434 | (JDIMENSION) jround_up((long) compptr->height_in_blocks, |
435 | (long) compptr->v_samp_factor), | 435 | (long) compptr->v_samp_factor), |
436 | (JDIMENSION) compptr->v_samp_factor); | 436 | (JDIMENSION) compptr->v_samp_factor); |
437 | } | 437 | } |
438 | #else | 438 | #else |
439 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | 439 | ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
440 | #endif | 440 | #endif |
441 | } else { | 441 | } else { |
442 | /* We only need a single-MCU buffer. */ | 442 | /* We only need a single-MCU buffer. */ |
443 | JBLOCKROW buffer; | 443 | JBLOCKROW buffer; |
444 | int i; | 444 | int i; |
445 | 445 | ||
446 | buffer = (JBLOCKROW) | 446 | buffer = (JBLOCKROW) |
447 | (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, | 447 | (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
448 | C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); | 448 | C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); |
449 | for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { | 449 | for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { |
450 | coef->MCU_buffer[i] = buffer + i; | 450 | coef->MCU_buffer[i] = buffer + i; |
451 | } | 451 | } |
452 | coef->whole_image[0] = NULL; /* flag for no virtual arrays */ | 452 | coef->whole_image[0] = NULL; /* flag for no virtual arrays */ |
453 | } | 453 | } |
454 | } | 454 | } |