diff options
author | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
---|---|---|
committer | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
commit | 393b5cd1dc438872af89d334ef6e5fcc59f27d47 (patch) | |
tree | 6a14521219942a08a1b95cb2f5a923a9edd60f63 /libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jcparam.c | |
parent | Add a note about rasters suggested start up code. (diff) | |
download | SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.zip SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.gz SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.bz2 SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.xz |
Added Irrlicht 1.8, but without all the Windows binaries.
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jcparam.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jcparam.c | 632 |
1 files changed, 632 insertions, 0 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jcparam.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jcparam.c new file mode 100644 index 0000000..10c5c87 --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jcparam.c | |||
@@ -0,0 +1,632 @@ | |||
1 | /* | ||
2 | * jcparam.c | ||
3 | * | ||
4 | * Copyright (C) 1991-1998, Thomas G. Lane. | ||
5 | * Modified 2003-2008 by Guido Vollbeding. | ||
6 | * This file is part of the Independent JPEG Group's software. | ||
7 | * For conditions of distribution and use, see the accompanying README file. | ||
8 | * | ||
9 | * This file contains optional default-setting code for the JPEG compressor. | ||
10 | * Applications do not have to use this file, but those that don't use it | ||
11 | * must know a lot more about the innards of the JPEG code. | ||
12 | */ | ||
13 | |||
14 | #define JPEG_INTERNALS | ||
15 | #include "jinclude.h" | ||
16 | #include "jpeglib.h" | ||
17 | |||
18 | |||
19 | /* | ||
20 | * Quantization table setup routines | ||
21 | */ | ||
22 | |||
23 | GLOBAL(void) | ||
24 | jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl, | ||
25 | const unsigned int *basic_table, | ||
26 | int scale_factor, boolean force_baseline) | ||
27 | /* Define a quantization table equal to the basic_table times | ||
28 | * a scale factor (given as a percentage). | ||
29 | * If force_baseline is TRUE, the computed quantization table entries | ||
30 | * are limited to 1..255 for JPEG baseline compatibility. | ||
31 | */ | ||
32 | { | ||
33 | JQUANT_TBL ** qtblptr; | ||
34 | int i; | ||
35 | long temp; | ||
36 | |||
37 | /* Safety check to ensure start_compress not called yet. */ | ||
38 | if (cinfo->global_state != CSTATE_START) | ||
39 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | ||
40 | |||
41 | if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS) | ||
42 | ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl); | ||
43 | |||
44 | qtblptr = & cinfo->quant_tbl_ptrs[which_tbl]; | ||
45 | |||
46 | if (*qtblptr == NULL) | ||
47 | *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo); | ||
48 | |||
49 | for (i = 0; i < DCTSIZE2; i++) { | ||
50 | temp = ((long) basic_table[i] * scale_factor + 50L) / 100L; | ||
51 | /* limit the values to the valid range */ | ||
52 | if (temp <= 0L) temp = 1L; | ||
53 | if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */ | ||
54 | if (force_baseline && temp > 255L) | ||
55 | temp = 255L; /* limit to baseline range if requested */ | ||
56 | (*qtblptr)->quantval[i] = (UINT16) temp; | ||
57 | } | ||
58 | |||
59 | /* Initialize sent_table FALSE so table will be written to JPEG file. */ | ||
60 | (*qtblptr)->sent_table = FALSE; | ||
61 | } | ||
62 | |||
63 | |||
64 | /* These are the sample quantization tables given in JPEG spec section K.1. | ||
65 | * The spec says that the values given produce "good" quality, and | ||
66 | * when divided by 2, "very good" quality. | ||
67 | */ | ||
68 | static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = { | ||
69 | 16, 11, 10, 16, 24, 40, 51, 61, | ||
70 | 12, 12, 14, 19, 26, 58, 60, 55, | ||
71 | 14, 13, 16, 24, 40, 57, 69, 56, | ||
72 | 14, 17, 22, 29, 51, 87, 80, 62, | ||
73 | 18, 22, 37, 56, 68, 109, 103, 77, | ||
74 | 24, 35, 55, 64, 81, 104, 113, 92, | ||
75 | 49, 64, 78, 87, 103, 121, 120, 101, | ||
76 | 72, 92, 95, 98, 112, 100, 103, 99 | ||
77 | }; | ||
78 | static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = { | ||
79 | 17, 18, 24, 47, 99, 99, 99, 99, | ||
80 | 18, 21, 26, 66, 99, 99, 99, 99, | ||
81 | 24, 26, 56, 99, 99, 99, 99, 99, | ||
82 | 47, 66, 99, 99, 99, 99, 99, 99, | ||
83 | 99, 99, 99, 99, 99, 99, 99, 99, | ||
84 | 99, 99, 99, 99, 99, 99, 99, 99, | ||
85 | 99, 99, 99, 99, 99, 99, 99, 99, | ||
86 | 99, 99, 99, 99, 99, 99, 99, 99 | ||
87 | }; | ||
88 | |||
89 | |||
90 | GLOBAL(void) | ||
91 | jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline) | ||
92 | /* Set or change the 'quality' (quantization) setting, using default tables | ||
93 | * and straight percentage-scaling quality scales. | ||
94 | * This entry point allows different scalings for luminance and chrominance. | ||
95 | */ | ||
96 | { | ||
97 | /* Set up two quantization tables using the specified scaling */ | ||
98 | jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, | ||
99 | cinfo->q_scale_factor[0], force_baseline); | ||
100 | jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, | ||
101 | cinfo->q_scale_factor[1], force_baseline); | ||
102 | } | ||
103 | |||
104 | |||
105 | GLOBAL(void) | ||
106 | jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor, | ||
107 | boolean force_baseline) | ||
108 | /* Set or change the 'quality' (quantization) setting, using default tables | ||
109 | * and a straight percentage-scaling quality scale. In most cases it's better | ||
110 | * to use jpeg_set_quality (below); this entry point is provided for | ||
111 | * applications that insist on a linear percentage scaling. | ||
112 | */ | ||
113 | { | ||
114 | /* Set up two quantization tables using the specified scaling */ | ||
115 | jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, | ||
116 | scale_factor, force_baseline); | ||
117 | jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, | ||
118 | scale_factor, force_baseline); | ||
119 | } | ||
120 | |||
121 | |||
122 | GLOBAL(int) | ||
123 | jpeg_quality_scaling (int quality) | ||
124 | /* Convert a user-specified quality rating to a percentage scaling factor | ||
125 | * for an underlying quantization table, using our recommended scaling curve. | ||
126 | * The input 'quality' factor should be 0 (terrible) to 100 (very good). | ||
127 | */ | ||
128 | { | ||
129 | /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */ | ||
130 | if (quality <= 0) quality = 1; | ||
131 | if (quality > 100) quality = 100; | ||
132 | |||
133 | /* The basic table is used as-is (scaling 100) for a quality of 50. | ||
134 | * Qualities 50..100 are converted to scaling percentage 200 - 2*Q; | ||
135 | * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table | ||
136 | * to make all the table entries 1 (hence, minimum quantization loss). | ||
137 | * Qualities 1..50 are converted to scaling percentage 5000/Q. | ||
138 | */ | ||
139 | if (quality < 50) | ||
140 | quality = 5000 / quality; | ||
141 | else | ||
142 | quality = 200 - quality*2; | ||
143 | |||
144 | return quality; | ||
145 | } | ||
146 | |||
147 | |||
148 | GLOBAL(void) | ||
149 | jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline) | ||
150 | /* Set or change the 'quality' (quantization) setting, using default tables. | ||
151 | * This is the standard quality-adjusting entry point for typical user | ||
152 | * interfaces; only those who want detailed control over quantization tables | ||
153 | * would use the preceding three routines directly. | ||
154 | */ | ||
155 | { | ||
156 | /* Convert user 0-100 rating to percentage scaling */ | ||
157 | quality = jpeg_quality_scaling(quality); | ||
158 | |||
159 | /* Set up standard quality tables */ | ||
160 | jpeg_set_linear_quality(cinfo, quality, force_baseline); | ||
161 | } | ||
162 | |||
163 | |||
164 | /* | ||
165 | * Huffman table setup routines | ||
166 | */ | ||
167 | |||
168 | LOCAL(void) | ||
169 | add_huff_table (j_compress_ptr cinfo, | ||
170 | JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val) | ||
171 | /* Define a Huffman table */ | ||
172 | { | ||
173 | int nsymbols, len; | ||
174 | |||
175 | if (*htblptr == NULL) | ||
176 | *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); | ||
177 | |||
178 | /* Copy the number-of-symbols-of-each-code-length counts */ | ||
179 | MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); | ||
180 | |||
181 | /* Validate the counts. We do this here mainly so we can copy the right | ||
182 | * number of symbols from the val[] array, without risking marching off | ||
183 | * the end of memory. jchuff.c will do a more thorough test later. | ||
184 | */ | ||
185 | nsymbols = 0; | ||
186 | for (len = 1; len <= 16; len++) | ||
187 | nsymbols += bits[len]; | ||
188 | if (nsymbols < 1 || nsymbols > 256) | ||
189 | ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); | ||
190 | |||
191 | MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8)); | ||
192 | |||
193 | /* Initialize sent_table FALSE so table will be written to JPEG file. */ | ||
194 | (*htblptr)->sent_table = FALSE; | ||
195 | } | ||
196 | |||
197 | |||
198 | LOCAL(void) | ||
199 | std_huff_tables (j_compress_ptr cinfo) | ||
200 | /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ | ||
201 | /* IMPORTANT: these are only valid for 8-bit data precision! */ | ||
202 | { | ||
203 | static const UINT8 bits_dc_luminance[17] = | ||
204 | { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; | ||
205 | static const UINT8 val_dc_luminance[] = | ||
206 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; | ||
207 | |||
208 | static const UINT8 bits_dc_chrominance[17] = | ||
209 | { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; | ||
210 | static const UINT8 val_dc_chrominance[] = | ||
211 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; | ||
212 | |||
213 | static const UINT8 bits_ac_luminance[17] = | ||
214 | { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; | ||
215 | static const UINT8 val_ac_luminance[] = | ||
216 | { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, | ||
217 | 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, | ||
218 | 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, | ||
219 | 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, | ||
220 | 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, | ||
221 | 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, | ||
222 | 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, | ||
223 | 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, | ||
224 | 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, | ||
225 | 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, | ||
226 | 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, | ||
227 | 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, | ||
228 | 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, | ||
229 | 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, | ||
230 | 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, | ||
231 | 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, | ||
232 | 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, | ||
233 | 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, | ||
234 | 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, | ||
235 | 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, | ||
236 | 0xf9, 0xfa }; | ||
237 | |||
238 | static const UINT8 bits_ac_chrominance[17] = | ||
239 | { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; | ||
240 | static const UINT8 val_ac_chrominance[] = | ||
241 | { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, | ||
242 | 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, | ||
243 | 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, | ||
244 | 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, | ||
245 | 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, | ||
246 | 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, | ||
247 | 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, | ||
248 | 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, | ||
249 | 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, | ||
250 | 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, | ||
251 | 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, | ||
252 | 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | ||
253 | 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, | ||
254 | 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, | ||
255 | 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, | ||
256 | 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, | ||
257 | 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, | ||
258 | 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, | ||
259 | 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, | ||
260 | 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, | ||
261 | 0xf9, 0xfa }; | ||
262 | |||
263 | add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0], | ||
264 | bits_dc_luminance, val_dc_luminance); | ||
265 | add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0], | ||
266 | bits_ac_luminance, val_ac_luminance); | ||
267 | add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1], | ||
268 | bits_dc_chrominance, val_dc_chrominance); | ||
269 | add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1], | ||
270 | bits_ac_chrominance, val_ac_chrominance); | ||
271 | } | ||
272 | |||
273 | |||
274 | /* | ||
275 | * Default parameter setup for compression. | ||
276 | * | ||
277 | * Applications that don't choose to use this routine must do their | ||
278 | * own setup of all these parameters. Alternately, you can call this | ||
279 | * to establish defaults and then alter parameters selectively. This | ||
280 | * is the recommended approach since, if we add any new parameters, | ||
281 | * your code will still work (they'll be set to reasonable defaults). | ||
282 | */ | ||
283 | |||
284 | GLOBAL(void) | ||
285 | jpeg_set_defaults (j_compress_ptr cinfo) | ||
286 | { | ||
287 | int i; | ||
288 | |||
289 | /* Safety check to ensure start_compress not called yet. */ | ||
290 | if (cinfo->global_state != CSTATE_START) | ||
291 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | ||
292 | |||
293 | /* Allocate comp_info array large enough for maximum component count. | ||
294 | * Array is made permanent in case application wants to compress | ||
295 | * multiple images at same param settings. | ||
296 | */ | ||
297 | if (cinfo->comp_info == NULL) | ||
298 | cinfo->comp_info = (jpeg_component_info *) | ||
299 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, | ||
300 | MAX_COMPONENTS * SIZEOF(jpeg_component_info)); | ||
301 | |||
302 | /* Initialize everything not dependent on the color space */ | ||
303 | |||
304 | cinfo->scale_num = 1; /* 1:1 scaling */ | ||
305 | cinfo->scale_denom = 1; | ||
306 | cinfo->data_precision = BITS_IN_JSAMPLE; | ||
307 | /* Set up two quantization tables using default quality of 75 */ | ||
308 | jpeg_set_quality(cinfo, 75, TRUE); | ||
309 | /* Set up two Huffman tables */ | ||
310 | std_huff_tables(cinfo); | ||
311 | |||
312 | /* Initialize default arithmetic coding conditioning */ | ||
313 | for (i = 0; i < NUM_ARITH_TBLS; i++) { | ||
314 | cinfo->arith_dc_L[i] = 0; | ||
315 | cinfo->arith_dc_U[i] = 1; | ||
316 | cinfo->arith_ac_K[i] = 5; | ||
317 | } | ||
318 | |||
319 | /* Default is no multiple-scan output */ | ||
320 | cinfo->scan_info = NULL; | ||
321 | cinfo->num_scans = 0; | ||
322 | |||
323 | /* Expect normal source image, not raw downsampled data */ | ||
324 | cinfo->raw_data_in = FALSE; | ||
325 | |||
326 | /* Use Huffman coding, not arithmetic coding, by default */ | ||
327 | cinfo->arith_code = FALSE; | ||
328 | |||
329 | /* By default, don't do extra passes to optimize entropy coding */ | ||
330 | cinfo->optimize_coding = FALSE; | ||
331 | /* The standard Huffman tables are only valid for 8-bit data precision. | ||
332 | * If the precision is higher, force optimization on so that usable | ||
333 | * tables will be computed. This test can be removed if default tables | ||
334 | * are supplied that are valid for the desired precision. | ||
335 | */ | ||
336 | if (cinfo->data_precision > 8) | ||
337 | cinfo->optimize_coding = TRUE; | ||
338 | |||
339 | /* By default, use the simpler non-cosited sampling alignment */ | ||
340 | cinfo->CCIR601_sampling = FALSE; | ||
341 | |||
342 | /* By default, apply fancy downsampling */ | ||
343 | cinfo->do_fancy_downsampling = TRUE; | ||
344 | |||
345 | /* No input smoothing */ | ||
346 | cinfo->smoothing_factor = 0; | ||
347 | |||
348 | /* DCT algorithm preference */ | ||
349 | cinfo->dct_method = JDCT_DEFAULT; | ||
350 | |||
351 | /* No restart markers */ | ||
352 | cinfo->restart_interval = 0; | ||
353 | cinfo->restart_in_rows = 0; | ||
354 | |||
355 | /* Fill in default JFIF marker parameters. Note that whether the marker | ||
356 | * will actually be written is determined by jpeg_set_colorspace. | ||
357 | * | ||
358 | * By default, the library emits JFIF version code 1.01. | ||
359 | * An application that wants to emit JFIF 1.02 extension markers should set | ||
360 | * JFIF_minor_version to 2. We could probably get away with just defaulting | ||
361 | * to 1.02, but there may still be some decoders in use that will complain | ||
362 | * about that; saying 1.01 should minimize compatibility problems. | ||
363 | */ | ||
364 | cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */ | ||
365 | cinfo->JFIF_minor_version = 1; | ||
366 | cinfo->density_unit = 0; /* Pixel size is unknown by default */ | ||
367 | cinfo->X_density = 1; /* Pixel aspect ratio is square by default */ | ||
368 | cinfo->Y_density = 1; | ||
369 | |||
370 | /* Choose JPEG colorspace based on input space, set defaults accordingly */ | ||
371 | |||
372 | jpeg_default_colorspace(cinfo); | ||
373 | } | ||
374 | |||
375 | |||
376 | /* | ||
377 | * Select an appropriate JPEG colorspace for in_color_space. | ||
378 | */ | ||
379 | |||
380 | GLOBAL(void) | ||
381 | jpeg_default_colorspace (j_compress_ptr cinfo) | ||
382 | { | ||
383 | switch (cinfo->in_color_space) { | ||
384 | case JCS_GRAYSCALE: | ||
385 | jpeg_set_colorspace(cinfo, JCS_GRAYSCALE); | ||
386 | break; | ||
387 | case JCS_RGB: | ||
388 | jpeg_set_colorspace(cinfo, JCS_YCbCr); | ||
389 | break; | ||
390 | case JCS_YCbCr: | ||
391 | jpeg_set_colorspace(cinfo, JCS_YCbCr); | ||
392 | break; | ||
393 | case JCS_CMYK: | ||
394 | jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */ | ||
395 | break; | ||
396 | case JCS_YCCK: | ||
397 | jpeg_set_colorspace(cinfo, JCS_YCCK); | ||
398 | break; | ||
399 | case JCS_UNKNOWN: | ||
400 | jpeg_set_colorspace(cinfo, JCS_UNKNOWN); | ||
401 | break; | ||
402 | default: | ||
403 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | ||
404 | } | ||
405 | } | ||
406 | |||
407 | |||
408 | /* | ||
409 | * Set the JPEG colorspace, and choose colorspace-dependent default values. | ||
410 | */ | ||
411 | |||
412 | GLOBAL(void) | ||
413 | jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace) | ||
414 | { | ||
415 | jpeg_component_info * compptr; | ||
416 | int ci; | ||
417 | |||
418 | #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \ | ||
419 | (compptr = &cinfo->comp_info[index], \ | ||
420 | compptr->component_id = (id), \ | ||
421 | compptr->h_samp_factor = (hsamp), \ | ||
422 | compptr->v_samp_factor = (vsamp), \ | ||
423 | compptr->quant_tbl_no = (quant), \ | ||
424 | compptr->dc_tbl_no = (dctbl), \ | ||
425 | compptr->ac_tbl_no = (actbl) ) | ||
426 | |||
427 | /* Safety check to ensure start_compress not called yet. */ | ||
428 | if (cinfo->global_state != CSTATE_START) | ||
429 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | ||
430 | |||
431 | /* For all colorspaces, we use Q and Huff tables 0 for luminance components, | ||
432 | * tables 1 for chrominance components. | ||
433 | */ | ||
434 | |||
435 | cinfo->jpeg_color_space = colorspace; | ||
436 | |||
437 | cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */ | ||
438 | cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */ | ||
439 | |||
440 | switch (colorspace) { | ||
441 | case JCS_GRAYSCALE: | ||
442 | cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ | ||
443 | cinfo->num_components = 1; | ||
444 | /* JFIF specifies component ID 1 */ | ||
445 | SET_COMP(0, 1, 1,1, 0, 0,0); | ||
446 | break; | ||
447 | case JCS_RGB: | ||
448 | cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */ | ||
449 | cinfo->num_components = 3; | ||
450 | SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0); | ||
451 | SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0); | ||
452 | SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0); | ||
453 | break; | ||
454 | case JCS_YCbCr: | ||
455 | cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ | ||
456 | cinfo->num_components = 3; | ||
457 | /* JFIF specifies component IDs 1,2,3 */ | ||
458 | /* We default to 2x2 subsamples of chrominance */ | ||
459 | SET_COMP(0, 1, 2,2, 0, 0,0); | ||
460 | SET_COMP(1, 2, 1,1, 1, 1,1); | ||
461 | SET_COMP(2, 3, 1,1, 1, 1,1); | ||
462 | break; | ||
463 | case JCS_CMYK: | ||
464 | cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */ | ||
465 | cinfo->num_components = 4; | ||
466 | SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0); | ||
467 | SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0); | ||
468 | SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0); | ||
469 | SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0); | ||
470 | break; | ||
471 | case JCS_YCCK: | ||
472 | cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */ | ||
473 | cinfo->num_components = 4; | ||
474 | SET_COMP(0, 1, 2,2, 0, 0,0); | ||
475 | SET_COMP(1, 2, 1,1, 1, 1,1); | ||
476 | SET_COMP(2, 3, 1,1, 1, 1,1); | ||
477 | SET_COMP(3, 4, 2,2, 0, 0,0); | ||
478 | break; | ||
479 | case JCS_UNKNOWN: | ||
480 | cinfo->num_components = cinfo->input_components; | ||
481 | if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS) | ||
482 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, | ||
483 | MAX_COMPONENTS); | ||
484 | for (ci = 0; ci < cinfo->num_components; ci++) { | ||
485 | SET_COMP(ci, ci, 1,1, 0, 0,0); | ||
486 | } | ||
487 | break; | ||
488 | default: | ||
489 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | ||
490 | } | ||
491 | } | ||
492 | |||
493 | |||
494 | #ifdef C_PROGRESSIVE_SUPPORTED | ||
495 | |||
496 | LOCAL(jpeg_scan_info *) | ||
497 | fill_a_scan (jpeg_scan_info * scanptr, int ci, | ||
498 | int Ss, int Se, int Ah, int Al) | ||
499 | /* Support routine: generate one scan for specified component */ | ||
500 | { | ||
501 | scanptr->comps_in_scan = 1; | ||
502 | scanptr->component_index[0] = ci; | ||
503 | scanptr->Ss = Ss; | ||
504 | scanptr->Se = Se; | ||
505 | scanptr->Ah = Ah; | ||
506 | scanptr->Al = Al; | ||
507 | scanptr++; | ||
508 | return scanptr; | ||
509 | } | ||
510 | |||
511 | LOCAL(jpeg_scan_info *) | ||
512 | fill_scans (jpeg_scan_info * scanptr, int ncomps, | ||
513 | int Ss, int Se, int Ah, int Al) | ||
514 | /* Support routine: generate one scan for each component */ | ||
515 | { | ||
516 | int ci; | ||
517 | |||
518 | for (ci = 0; ci < ncomps; ci++) { | ||
519 | scanptr->comps_in_scan = 1; | ||
520 | scanptr->component_index[0] = ci; | ||
521 | scanptr->Ss = Ss; | ||
522 | scanptr->Se = Se; | ||
523 | scanptr->Ah = Ah; | ||
524 | scanptr->Al = Al; | ||
525 | scanptr++; | ||
526 | } | ||
527 | return scanptr; | ||
528 | } | ||
529 | |||
530 | LOCAL(jpeg_scan_info *) | ||
531 | fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al) | ||
532 | /* Support routine: generate interleaved DC scan if possible, else N scans */ | ||
533 | { | ||
534 | int ci; | ||
535 | |||
536 | if (ncomps <= MAX_COMPS_IN_SCAN) { | ||
537 | /* Single interleaved DC scan */ | ||
538 | scanptr->comps_in_scan = ncomps; | ||
539 | for (ci = 0; ci < ncomps; ci++) | ||
540 | scanptr->component_index[ci] = ci; | ||
541 | scanptr->Ss = scanptr->Se = 0; | ||
542 | scanptr->Ah = Ah; | ||
543 | scanptr->Al = Al; | ||
544 | scanptr++; | ||
545 | } else { | ||
546 | /* Noninterleaved DC scan for each component */ | ||
547 | scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al); | ||
548 | } | ||
549 | return scanptr; | ||
550 | } | ||
551 | |||
552 | |||
553 | /* | ||
554 | * Create a recommended progressive-JPEG script. | ||
555 | * cinfo->num_components and cinfo->jpeg_color_space must be correct. | ||
556 | */ | ||
557 | |||
558 | GLOBAL(void) | ||
559 | jpeg_simple_progression (j_compress_ptr cinfo) | ||
560 | { | ||
561 | int ncomps = cinfo->num_components; | ||
562 | int nscans; | ||
563 | jpeg_scan_info * scanptr; | ||
564 | |||
565 | /* Safety check to ensure start_compress not called yet. */ | ||
566 | if (cinfo->global_state != CSTATE_START) | ||
567 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | ||
568 | |||
569 | /* Figure space needed for script. Calculation must match code below! */ | ||
570 | if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { | ||
571 | /* Custom script for YCbCr color images. */ | ||
572 | nscans = 10; | ||
573 | } else { | ||
574 | /* All-purpose script for other color spaces. */ | ||
575 | if (ncomps > MAX_COMPS_IN_SCAN) | ||
576 | nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */ | ||
577 | else | ||
578 | nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */ | ||
579 | } | ||
580 | |||
581 | /* Allocate space for script. | ||
582 | * We need to put it in the permanent pool in case the application performs | ||
583 | * multiple compressions without changing the settings. To avoid a memory | ||
584 | * leak if jpeg_simple_progression is called repeatedly for the same JPEG | ||
585 | * object, we try to re-use previously allocated space, and we allocate | ||
586 | * enough space to handle YCbCr even if initially asked for grayscale. | ||
587 | */ | ||
588 | if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) { | ||
589 | cinfo->script_space_size = MAX(nscans, 10); | ||
590 | cinfo->script_space = (jpeg_scan_info *) | ||
591 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, | ||
592 | cinfo->script_space_size * SIZEOF(jpeg_scan_info)); | ||
593 | } | ||
594 | scanptr = cinfo->script_space; | ||
595 | cinfo->scan_info = scanptr; | ||
596 | cinfo->num_scans = nscans; | ||
597 | |||
598 | if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { | ||
599 | /* Custom script for YCbCr color images. */ | ||
600 | /* Initial DC scan */ | ||
601 | scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); | ||
602 | /* Initial AC scan: get some luma data out in a hurry */ | ||
603 | scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2); | ||
604 | /* Chroma data is too small to be worth expending many scans on */ | ||
605 | scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1); | ||
606 | scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1); | ||
607 | /* Complete spectral selection for luma AC */ | ||
608 | scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2); | ||
609 | /* Refine next bit of luma AC */ | ||
610 | scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1); | ||
611 | /* Finish DC successive approximation */ | ||
612 | scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); | ||
613 | /* Finish AC successive approximation */ | ||
614 | scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0); | ||
615 | scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0); | ||
616 | /* Luma bottom bit comes last since it's usually largest scan */ | ||
617 | scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0); | ||
618 | } else { | ||
619 | /* All-purpose script for other color spaces. */ | ||
620 | /* Successive approximation first pass */ | ||
621 | scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); | ||
622 | scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2); | ||
623 | scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2); | ||
624 | /* Successive approximation second pass */ | ||
625 | scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1); | ||
626 | /* Successive approximation final pass */ | ||
627 | scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); | ||
628 | scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0); | ||
629 | } | ||
630 | } | ||
631 | |||
632 | #endif /* C_PROGRESSIVE_SUPPORTED */ | ||