| OLD | NEW |
|---|
| (Empty) |
| 1 /* | |
| 2 * jcparam.c | |
| 3 * | |
| 4 * Copyright (C) 1991-1998, Thomas G. Lane. | |
| 5 * This file is part of the Independent JPEG Group's software. | |
| 6 * For conditions of distribution and use, see the accompanying README file. | |
| 7 * | |
| 8 * This file contains optional default-setting code for the JPEG compressor. | |
| 9 * Applications do not have to use this file, but those that don't use it | |
| 10 * must know a lot more about the innards of the JPEG code. | |
| 11 */ | |
| 12 | |
| 13 #define JPEG_INTERNALS | |
| 14 #include "jinclude.h" | |
| 15 #include "jpeglib.h" | |
| 16 | |
| 17 | |
| 18 /* | |
| 19 * Quantization table setup routines | |
| 20 */ | |
| 21 | |
| 22 GLOBAL(void) | |
| 23 jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl, | |
| 24 const unsigned int *basic_table, | |
| 25 int scale_factor, boolean force_baseline) | |
| 26 /* Define a quantization table equal to the basic_table times | |
| 27 * a scale factor (given as a percentage). | |
| 28 * If force_baseline is TRUE, the computed quantization table entries | |
| 29 * are limited to 1..255 for JPEG baseline compatibility. | |
| 30 */ | |
| 31 { | |
| 32 JQUANT_TBL ** qtblptr; | |
| 33 int i; | |
| 34 long temp; | |
| 35 | |
| 36 /* Safety check to ensure start_compress not called yet. */ | |
| 37 if (cinfo->global_state != CSTATE_START) | |
| 38 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | |
| 39 | |
| 40 if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS) | |
| 41 ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl); | |
| 42 | |
| 43 qtblptr = & cinfo->quant_tbl_ptrs[which_tbl]; | |
| 44 | |
| 45 if (*qtblptr == NULL) | |
| 46 *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo); | |
| 47 | |
| 48 for (i = 0; i < DCTSIZE2; i++) { | |
| 49 temp = ((long) basic_table[i] * scale_factor + 50L) / 100L; | |
| 50 /* limit the values to the valid range */ | |
| 51 if (temp <= 0L) temp = 1L; | |
| 52 if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */ | |
| 53 if (force_baseline && temp > 255L) | |
| 54 temp = 255L; /* limit to baseline range if requested */ | |
| 55 (*qtblptr)->quantval[i] = (UINT16) temp; | |
| 56 } | |
| 57 | |
| 58 /* Initialize sent_table FALSE so table will be written to JPEG file. */ | |
| 59 (*qtblptr)->sent_table = FALSE; | |
| 60 } | |
| 61 | |
| 62 | |
| 63 GLOBAL(void) | |
| 64 jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor, | |
| 65 boolean force_baseline) | |
| 66 /* Set or change the 'quality' (quantization) setting, using default tables | |
| 67 * and a straight percentage-scaling quality scale. In most cases it's better | |
| 68 * to use jpeg_set_quality (below); this entry point is provided for | |
| 69 * applications that insist on a linear percentage scaling. | |
| 70 */ | |
| 71 { | |
| 72 /* These are the sample quantization tables given in JPEG spec section K.1. | |
| 73 * The spec says that the values given produce "good" quality, and | |
| 74 * when divided by 2, "very good" quality. | |
| 75 */ | |
| 76 static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = { | |
| 77 16, 11, 10, 16, 24, 40, 51, 61, | |
| 78 12, 12, 14, 19, 26, 58, 60, 55, | |
| 79 14, 13, 16, 24, 40, 57, 69, 56, | |
| 80 14, 17, 22, 29, 51, 87, 80, 62, | |
| 81 18, 22, 37, 56, 68, 109, 103, 77, | |
| 82 24, 35, 55, 64, 81, 104, 113, 92, | |
| 83 49, 64, 78, 87, 103, 121, 120, 101, | |
| 84 72, 92, 95, 98, 112, 100, 103, 99 | |
| 85 }; | |
| 86 static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = { | |
| 87 17, 18, 24, 47, 99, 99, 99, 99, | |
| 88 18, 21, 26, 66, 99, 99, 99, 99, | |
| 89 24, 26, 56, 99, 99, 99, 99, 99, | |
| 90 47, 66, 99, 99, 99, 99, 99, 99, | |
| 91 99, 99, 99, 99, 99, 99, 99, 99, | |
| 92 99, 99, 99, 99, 99, 99, 99, 99, | |
| 93 99, 99, 99, 99, 99, 99, 99, 99, | |
| 94 99, 99, 99, 99, 99, 99, 99, 99 | |
| 95 }; | |
| 96 | |
| 97 /* Set up two quantization tables using the specified scaling */ | |
| 98 jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, | |
| 99 scale_factor, force_baseline); | |
| 100 jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, | |
| 101 scale_factor, force_baseline); | |
| 102 } | |
| 103 | |
| 104 | |
| 105 GLOBAL(int) | |
| 106 jpeg_quality_scaling (int quality) | |
| 107 /* Convert a user-specified quality rating to a percentage scaling factor | |
| 108 * for an underlying quantization table, using our recommended scaling curve. | |
| 109 * The input 'quality' factor should be 0 (terrible) to 100 (very good). | |
| 110 */ | |
| 111 { | |
| 112 /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */ | |
| 113 if (quality <= 0) quality = 1; | |
| 114 if (quality > 100) quality = 100; | |
| 115 | |
| 116 /* The basic table is used as-is (scaling 100) for a quality of 50. | |
| 117 * Qualities 50..100 are converted to scaling percentage 200 - 2*Q; | |
| 118 * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table | |
| 119 * to make all the table entries 1 (hence, minimum quantization loss). | |
| 120 * Qualities 1..50 are converted to scaling percentage 5000/Q. | |
| 121 */ | |
| 122 if (quality < 50) | |
| 123 quality = 5000 / quality; | |
| 124 else | |
| 125 quality = 200 - quality*2; | |
| 126 | |
| 127 return quality; | |
| 128 } | |
| 129 | |
| 130 | |
| 131 GLOBAL(void) | |
| 132 jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline) | |
| 133 /* Set or change the 'quality' (quantization) setting, using default tables. | |
| 134 * This is the standard quality-adjusting entry point for typical user | |
| 135 * interfaces; only those who want detailed control over quantization tables | |
| 136 * would use the preceding three routines directly. | |
| 137 */ | |
| 138 { | |
| 139 /* Convert user 0-100 rating to percentage scaling */ | |
| 140 quality = jpeg_quality_scaling(quality); | |
| 141 | |
| 142 /* Set up standard quality tables */ | |
| 143 jpeg_set_linear_quality(cinfo, quality, force_baseline); | |
| 144 } | |
| 145 | |
| 146 | |
| 147 /* | |
| 148 * Huffman table setup routines | |
| 149 */ | |
| 150 | |
| 151 LOCAL(void) | |
| 152 add_huff_table (j_compress_ptr cinfo, | |
| 153 JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val) | |
| 154 /* Define a Huffman table */ | |
| 155 { | |
| 156 int nsymbols, len; | |
| 157 | |
| 158 if (*htblptr == NULL) | |
| 159 *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); | |
| 160 | |
| 161 /* Copy the number-of-symbols-of-each-code-length counts */ | |
| 162 MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); | |
| 163 | |
| 164 /* Validate the counts. We do this here mainly so we can copy the right | |
| 165 * number of symbols from the val[] array, without risking marching off | |
| 166 * the end of memory. jchuff.c will do a more thorough test later. | |
| 167 */ | |
| 168 nsymbols = 0; | |
| 169 for (len = 1; len <= 16; len++) | |
| 170 nsymbols += bits[len]; | |
| 171 if (nsymbols < 1 || nsymbols > 256) | |
| 172 ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); | |
| 173 | |
| 174 MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8)); | |
| 175 | |
| 176 /* Initialize sent_table FALSE so table will be written to JPEG file. */ | |
| 177 (*htblptr)->sent_table = FALSE; | |
| 178 } | |
| 179 | |
| 180 | |
| 181 LOCAL(void) | |
| 182 std_huff_tables (j_compress_ptr cinfo) | |
| 183 /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ | |
| 184 /* IMPORTANT: these are only valid for 8-bit data precision! */ | |
| 185 { | |
| 186 static const UINT8 bits_dc_luminance[17] = | |
| 187 { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; | |
| 188 static const UINT8 val_dc_luminance[] = | |
| 189 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; | |
| 190 | |
| 191 static const UINT8 bits_dc_chrominance[17] = | |
| 192 { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; | |
| 193 static const UINT8 val_dc_chrominance[] = | |
| 194 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; | |
| 195 | |
| 196 static const UINT8 bits_ac_luminance[17] = | |
| 197 { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; | |
| 198 static const UINT8 val_ac_luminance[] = | |
| 199 { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, | |
| 200 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, | |
| 201 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, | |
| 202 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, | |
| 203 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, | |
| 204 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, | |
| 205 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, | |
| 206 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, | |
| 207 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, | |
| 208 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, | |
| 209 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, | |
| 210 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, | |
| 211 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, | |
| 212 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, | |
| 213 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, | |
| 214 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, | |
| 215 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, | |
| 216 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, | |
| 217 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, | |
| 218 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, | |
| 219 0xf9, 0xfa }; | |
| 220 | |
| 221 static const UINT8 bits_ac_chrominance[17] = | |
| 222 { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; | |
| 223 static const UINT8 val_ac_chrominance[] = | |
| 224 { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, | |
| 225 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, | |
| 226 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, | |
| 227 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, | |
| 228 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, | |
| 229 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, | |
| 230 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, | |
| 231 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, | |
| 232 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, | |
| 233 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, | |
| 234 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, | |
| 235 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | |
| 236 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, | |
| 237 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, | |
| 238 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, | |
| 239 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, | |
| 240 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, | |
| 241 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, | |
| 242 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, | |
| 243 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, | |
| 244 0xf9, 0xfa }; | |
| 245 | |
| 246 add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0], | |
| 247 bits_dc_luminance, val_dc_luminance); | |
| 248 add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0], | |
| 249 bits_ac_luminance, val_ac_luminance); | |
| 250 add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1], | |
| 251 bits_dc_chrominance, val_dc_chrominance); | |
| 252 add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1], | |
| 253 bits_ac_chrominance, val_ac_chrominance); | |
| 254 } | |
| 255 | |
| 256 | |
| 257 /* | |
| 258 * Default parameter setup for compression. | |
| 259 * | |
| 260 * Applications that don't choose to use this routine must do their | |
| 261 * own setup of all these parameters. Alternately, you can call this | |
| 262 * to establish defaults and then alter parameters selectively. This | |
| 263 * is the recommended approach since, if we add any new parameters, | |
| 264 * your code will still work (they'll be set to reasonable defaults). | |
| 265 */ | |
| 266 | |
| 267 GLOBAL(void) | |
| 268 jpeg_set_defaults (j_compress_ptr cinfo) | |
| 269 { | |
| 270 int i; | |
| 271 | |
| 272 /* Safety check to ensure start_compress not called yet. */ | |
| 273 if (cinfo->global_state != CSTATE_START) | |
| 274 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | |
| 275 | |
| 276 /* Allocate comp_info array large enough for maximum component count. | |
| 277 * Array is made permanent in case application wants to compress | |
| 278 * multiple images at same param settings. | |
| 279 */ | |
| 280 if (cinfo->comp_info == NULL) | |
| 281 cinfo->comp_info = (jpeg_component_info *) | |
| 282 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, | |
| 283 MAX_COMPONENTS * SIZEOF(jpeg_component_info)); | |
| 284 | |
| 285 /* Initialize everything not dependent on the color space */ | |
| 286 | |
| 287 cinfo->data_precision = BITS_IN_JSAMPLE; | |
| 288 /* Set up two quantization tables using default quality of 75 */ | |
| 289 jpeg_set_quality(cinfo, 75, TRUE); | |
| 290 /* Set up two Huffman tables */ | |
| 291 std_huff_tables(cinfo); | |
| 292 | |
| 293 /* Initialize default arithmetic coding conditioning */ | |
| 294 for (i = 0; i < NUM_ARITH_TBLS; i++) { | |
| 295 cinfo->arith_dc_L[i] = 0; | |
| 296 cinfo->arith_dc_U[i] = 1; | |
| 297 cinfo->arith_ac_K[i] = 5; | |
| 298 } | |
| 299 | |
| 300 /* Default is no multiple-scan output */ | |
| 301 cinfo->scan_info = NULL; | |
| 302 cinfo->num_scans = 0; | |
| 303 | |
| 304 /* Expect normal source image, not raw downsampled data */ | |
| 305 cinfo->raw_data_in = FALSE; | |
| 306 | |
| 307 /* Use Huffman coding, not arithmetic coding, by default */ | |
| 308 cinfo->arith_code = FALSE; | |
| 309 | |
| 310 /* By default, don't do extra passes to optimize entropy coding */ | |
| 311 cinfo->optimize_coding = FALSE; | |
| 312 /* The standard Huffman tables are only valid for 8-bit data precision. | |
| 313 * If the precision is higher, force optimization on so that usable | |
| 314 * tables will be computed. This test can be removed if default tables | |
| 315 * are supplied that are valid for the desired precision. | |
| 316 */ | |
| 317 if (cinfo->data_precision > 8) | |
| 318 cinfo->optimize_coding = TRUE; | |
| 319 | |
| 320 /* By default, use the simpler non-cosited sampling alignment */ | |
| 321 cinfo->CCIR601_sampling = FALSE; | |
| 322 | |
| 323 /* No input smoothing */ | |
| 324 cinfo->smoothing_factor = 0; | |
| 325 | |
| 326 /* DCT algorithm preference */ | |
| 327 cinfo->dct_method = JDCT_DEFAULT; | |
| 328 | |
| 329 /* No restart markers */ | |
| 330 cinfo->restart_interval = 0; | |
| 331 cinfo->restart_in_rows = 0; | |
| 332 | |
| 333 /* Fill in default JFIF marker parameters. Note that whether the marker | |
| 334 * will actually be written is determined by jpeg_set_colorspace. | |
| 335 * | |
| 336 * By default, the library emits JFIF version code 1.01. | |
| 337 * An application that wants to emit JFIF 1.02 extension markers should set | |
| 338 * JFIF_minor_version to 2. We could probably get away with just defaulting | |
| 339 * to 1.02, but there may still be some decoders in use that will complain | |
| 340 * about that; saying 1.01 should minimize compatibility problems. | |
| 341 */ | |
| 342 cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */ | |
| 343 cinfo->JFIF_minor_version = 1; | |
| 344 cinfo->density_unit = 0; /* Pixel size is unknown by default */ | |
| 345 cinfo->X_density = 1; /* Pixel aspect ratio is square by default */ | |
| 346 cinfo->Y_density = 1; | |
| 347 | |
| 348 /* Choose JPEG colorspace based on input space, set defaults accordingly */ | |
| 349 | |
| 350 jpeg_default_colorspace(cinfo); | |
| 351 } | |
| 352 | |
| 353 | |
| 354 /* | |
| 355 * Select an appropriate JPEG colorspace for in_color_space. | |
| 356 */ | |
| 357 | |
| 358 GLOBAL(void) | |
| 359 jpeg_default_colorspace (j_compress_ptr cinfo) | |
| 360 { | |
| 361 switch (cinfo->in_color_space) { | |
| 362 case JCS_GRAYSCALE: | |
| 363 jpeg_set_colorspace(cinfo, JCS_GRAYSCALE); | |
| 364 break; | |
| 365 case JCS_RGB: | |
| 366 jpeg_set_colorspace(cinfo, JCS_YCbCr); | |
| 367 break; | |
| 368 case JCS_YCbCr: | |
| 369 jpeg_set_colorspace(cinfo, JCS_YCbCr); | |
| 370 break; | |
| 371 case JCS_CMYK: | |
| 372 jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */ | |
| 373 break; | |
| 374 case JCS_YCCK: | |
| 375 jpeg_set_colorspace(cinfo, JCS_YCCK); | |
| 376 break; | |
| 377 case JCS_UNKNOWN: | |
| 378 jpeg_set_colorspace(cinfo, JCS_UNKNOWN); | |
| 379 break; | |
| 380 default: | |
| 381 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 | |
| 386 /* | |
| 387 * Set the JPEG colorspace, and choose colorspace-dependent default values. | |
| 388 */ | |
| 389 | |
| 390 GLOBAL(void) | |
| 391 jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace) | |
| 392 { | |
| 393 jpeg_component_info * compptr; | |
| 394 int ci; | |
| 395 | |
| 396 #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \ | |
| 397 (compptr = &cinfo->comp_info[index], \ | |
| 398 compptr->component_id = (id), \ | |
| 399 compptr->h_samp_factor = (hsamp), \ | |
| 400 compptr->v_samp_factor = (vsamp), \ | |
| 401 compptr->quant_tbl_no = (quant), \ | |
| 402 compptr->dc_tbl_no = (dctbl), \ | |
| 403 compptr->ac_tbl_no = (actbl) ) | |
| 404 | |
| 405 /* Safety check to ensure start_compress not called yet. */ | |
| 406 if (cinfo->global_state != CSTATE_START) | |
| 407 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | |
| 408 | |
| 409 /* For all colorspaces, we use Q and Huff tables 0 for luminance components, | |
| 410 * tables 1 for chrominance components. | |
| 411 */ | |
| 412 | |
| 413 cinfo->jpeg_color_space = colorspace; | |
| 414 | |
| 415 cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */ | |
| 416 cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */ | |
| 417 | |
| 418 switch (colorspace) { | |
| 419 case JCS_GRAYSCALE: | |
| 420 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ | |
| 421 cinfo->num_components = 1; | |
| 422 /* JFIF specifies component ID 1 */ | |
| 423 SET_COMP(0, 1, 1,1, 0, 0,0); | |
| 424 break; | |
| 425 case JCS_RGB: | |
| 426 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */ | |
| 427 cinfo->num_components = 3; | |
| 428 SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0); | |
| 429 SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0); | |
| 430 SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0); | |
| 431 break; | |
| 432 case JCS_YCbCr: | |
| 433 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ | |
| 434 cinfo->num_components = 3; | |
| 435 /* JFIF specifies component IDs 1,2,3 */ | |
| 436 /* We default to 2x2 subsamples of chrominance */ | |
| 437 SET_COMP(0, 1, 2,2, 0, 0,0); | |
| 438 SET_COMP(1, 2, 1,1, 1, 1,1); | |
| 439 SET_COMP(2, 3, 1,1, 1, 1,1); | |
| 440 break; | |
| 441 case JCS_CMYK: | |
| 442 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */ | |
| 443 cinfo->num_components = 4; | |
| 444 SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0); | |
| 445 SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0); | |
| 446 SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0); | |
| 447 SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0); | |
| 448 break; | |
| 449 case JCS_YCCK: | |
| 450 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */ | |
| 451 cinfo->num_components = 4; | |
| 452 SET_COMP(0, 1, 2,2, 0, 0,0); | |
| 453 SET_COMP(1, 2, 1,1, 1, 1,1); | |
| 454 SET_COMP(2, 3, 1,1, 1, 1,1); | |
| 455 SET_COMP(3, 4, 2,2, 0, 0,0); | |
| 456 break; | |
| 457 case JCS_UNKNOWN: | |
| 458 cinfo->num_components = cinfo->input_components; | |
| 459 if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS) | |
| 460 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, | |
| 461 MAX_COMPONENTS); | |
| 462 for (ci = 0; ci < cinfo->num_components; ci++) { | |
| 463 SET_COMP(ci, ci, 1,1, 0, 0,0); | |
| 464 } | |
| 465 break; | |
| 466 default: | |
| 467 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | |
| 468 } | |
| 469 } | |
| 470 | |
| 471 | |
| 472 #ifdef C_PROGRESSIVE_SUPPORTED | |
| 473 | |
| 474 LOCAL(jpeg_scan_info *) | |
| 475 fill_a_scan (jpeg_scan_info * scanptr, int ci, | |
| 476 int Ss, int Se, int Ah, int Al) | |
| 477 /* Support routine: generate one scan for specified component */ | |
| 478 { | |
| 479 scanptr->comps_in_scan = 1; | |
| 480 scanptr->component_index[0] = ci; | |
| 481 scanptr->Ss = Ss; | |
| 482 scanptr->Se = Se; | |
| 483 scanptr->Ah = Ah; | |
| 484 scanptr->Al = Al; | |
| 485 scanptr++; | |
| 486 return scanptr; | |
| 487 } | |
| 488 | |
| 489 LOCAL(jpeg_scan_info *) | |
| 490 fill_scans (jpeg_scan_info * scanptr, int ncomps, | |
| 491 int Ss, int Se, int Ah, int Al) | |
| 492 /* Support routine: generate one scan for each component */ | |
| 493 { | |
| 494 int ci; | |
| 495 | |
| 496 for (ci = 0; ci < ncomps; ci++) { | |
| 497 scanptr->comps_in_scan = 1; | |
| 498 scanptr->component_index[0] = ci; | |
| 499 scanptr->Ss = Ss; | |
| 500 scanptr->Se = Se; | |
| 501 scanptr->Ah = Ah; | |
| 502 scanptr->Al = Al; | |
| 503 scanptr++; | |
| 504 } | |
| 505 return scanptr; | |
| 506 } | |
| 507 | |
| 508 LOCAL(jpeg_scan_info *) | |
| 509 fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al) | |
| 510 /* Support routine: generate interleaved DC scan if possible, else N scans */ | |
| 511 { | |
| 512 int ci; | |
| 513 | |
| 514 if (ncomps <= MAX_COMPS_IN_SCAN) { | |
| 515 /* Single interleaved DC scan */ | |
| 516 scanptr->comps_in_scan = ncomps; | |
| 517 for (ci = 0; ci < ncomps; ci++) | |
| 518 scanptr->component_index[ci] = ci; | |
| 519 scanptr->Ss = scanptr->Se = 0; | |
| 520 scanptr->Ah = Ah; | |
| 521 scanptr->Al = Al; | |
| 522 scanptr++; | |
| 523 } else { | |
| 524 /* Noninterleaved DC scan for each component */ | |
| 525 scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al); | |
| 526 } | |
| 527 return scanptr; | |
| 528 } | |
| 529 | |
| 530 | |
| 531 /* | |
| 532 * Create a recommended progressive-JPEG script. | |
| 533 * cinfo->num_components and cinfo->jpeg_color_space must be correct. | |
| 534 */ | |
| 535 | |
| 536 GLOBAL(void) | |
| 537 jpeg_simple_progression (j_compress_ptr cinfo) | |
| 538 { | |
| 539 int ncomps = cinfo->num_components; | |
| 540 int nscans; | |
| 541 jpeg_scan_info * scanptr; | |
| 542 | |
| 543 /* Safety check to ensure start_compress not called yet. */ | |
| 544 if (cinfo->global_state != CSTATE_START) | |
| 545 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | |
| 546 | |
| 547 /* Figure space needed for script. Calculation must match code below! */ | |
| 548 if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { | |
| 549 /* Custom script for YCbCr color images. */ | |
| 550 nscans = 10; | |
| 551 } else { | |
| 552 /* All-purpose script for other color spaces. */ | |
| 553 if (ncomps > MAX_COMPS_IN_SCAN) | |
| 554 nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */ | |
| 555 else | |
| 556 nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */ | |
| 557 } | |
| 558 | |
| 559 /* Allocate space for script. | |
| 560 * We need to put it in the permanent pool in case the application performs | |
| 561 * multiple compressions without changing the settings. To avoid a memory | |
| 562 * leak if jpeg_simple_progression is called repeatedly for the same JPEG | |
| 563 * object, we try to re-use previously allocated space, and we allocate | |
| 564 * enough space to handle YCbCr even if initially asked for grayscale. | |
| 565 */ | |
| 566 if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) { | |
| 567 cinfo->script_space_size = MAX(nscans, 10); | |
| 568 cinfo->script_space = (jpeg_scan_info *) | |
| 569 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, | |
| 570 cinfo->script_space_size * SIZEOF(jpeg_scan_info)); | |
| 571 } | |
| 572 scanptr = cinfo->script_space; | |
| 573 cinfo->scan_info = scanptr; | |
| 574 cinfo->num_scans = nscans; | |
| 575 | |
| 576 if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { | |
| 577 /* Custom script for YCbCr color images. */ | |
| 578 /* Initial DC scan */ | |
| 579 scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); | |
| 580 /* Initial AC scan: get some luma data out in a hurry */ | |
| 581 scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2); | |
| 582 /* Chroma data is too small to be worth expending many scans on */ | |
| 583 scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1); | |
| 584 scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1); | |
| 585 /* Complete spectral selection for luma AC */ | |
| 586 scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2); | |
| 587 /* Refine next bit of luma AC */ | |
| 588 scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1); | |
| 589 /* Finish DC successive approximation */ | |
| 590 scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); | |
| 591 /* Finish AC successive approximation */ | |
| 592 scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0); | |
| 593 scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0); | |
| 594 /* Luma bottom bit comes last since it's usually largest scan */ | |
| 595 scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0); | |
| 596 } else { | |
| 597 /* All-purpose script for other color spaces. */ | |
| 598 /* Successive approximation first pass */ | |
| 599 scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); | |
| 600 scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2); | |
| 601 scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2); | |
| 602 /* Successive approximation second pass */ | |
| 603 scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1); | |
| 604 /* Successive approximation final pass */ | |
| 605 scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); | |
| 606 scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0); | |
| 607 } | |
| 608 } | |
| 609 | |
| 610 #endif /* C_PROGRESSIVE_SUPPORTED */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1705523002:
Remove libjpeg and libjpeg_turbo. (Closed)
Base URL: https://github.com/domokit/mojo.git@master