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annotate libs/libjpeg/jcparam.c @ 17:aef7f51f6397

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author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 10 Jun 2015 06:56:27 +0300
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nuclear@14 1 /*
nuclear@14 2 * jcparam.c
nuclear@14 3 *
nuclear@14 4 * Copyright (C) 1991-1998, Thomas G. Lane.
nuclear@14 5 * This file is part of the Independent JPEG Group's software.
nuclear@14 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@14 7 *
nuclear@14 8 * This file contains optional default-setting code for the JPEG compressor.
nuclear@14 9 * Applications do not have to use this file, but those that don't use it
nuclear@14 10 * must know a lot more about the innards of the JPEG code.
nuclear@14 11 */
nuclear@14 12
nuclear@14 13 #define JPEG_INTERNALS
nuclear@14 14 #include "jinclude.h"
nuclear@14 15 #include "jpeglib.h"
nuclear@14 16
nuclear@14 17
nuclear@14 18 /*
nuclear@14 19 * Quantization table setup routines
nuclear@14 20 */
nuclear@14 21
nuclear@14 22 GLOBAL(void)
nuclear@14 23 jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
nuclear@14 24 const unsigned int *basic_table,
nuclear@14 25 int scale_factor, boolean force_baseline)
nuclear@14 26 /* Define a quantization table equal to the basic_table times
nuclear@14 27 * a scale factor (given as a percentage).
nuclear@14 28 * If force_baseline is TRUE, the computed quantization table entries
nuclear@14 29 * are limited to 1..255 for JPEG baseline compatibility.
nuclear@14 30 */
nuclear@14 31 {
nuclear@14 32 JQUANT_TBL ** qtblptr;
nuclear@14 33 int i;
nuclear@14 34 long temp;
nuclear@14 35
nuclear@14 36 /* Safety check to ensure start_compress not called yet. */
nuclear@14 37 if (cinfo->global_state != CSTATE_START)
nuclear@14 38 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 39
nuclear@14 40 if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
nuclear@14 41 ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
nuclear@14 42
nuclear@14 43 qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
nuclear@14 44
nuclear@14 45 if (*qtblptr == NULL)
nuclear@14 46 *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
nuclear@14 47
nuclear@14 48 for (i = 0; i < DCTSIZE2; i++) {
nuclear@14 49 temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
nuclear@14 50 /* limit the values to the valid range */
nuclear@14 51 if (temp <= 0L) temp = 1L;
nuclear@14 52 if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
nuclear@14 53 if (force_baseline && temp > 255L)
nuclear@14 54 temp = 255L; /* limit to baseline range if requested */
nuclear@14 55 (*qtblptr)->quantval[i] = (UINT16) temp;
nuclear@14 56 }
nuclear@14 57
nuclear@14 58 /* Initialize sent_table FALSE so table will be written to JPEG file. */
nuclear@14 59 (*qtblptr)->sent_table = FALSE;
nuclear@14 60 }
nuclear@14 61
nuclear@14 62
nuclear@14 63 GLOBAL(void)
nuclear@14 64 jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
nuclear@14 65 boolean force_baseline)
nuclear@14 66 /* Set or change the 'quality' (quantization) setting, using default tables
nuclear@14 67 * and a straight percentage-scaling quality scale. In most cases it's better
nuclear@14 68 * to use jpeg_set_quality (below); this entry point is provided for
nuclear@14 69 * applications that insist on a linear percentage scaling.
nuclear@14 70 */
nuclear@14 71 {
nuclear@14 72 /* These are the sample quantization tables given in JPEG spec section K.1.
nuclear@14 73 * The spec says that the values given produce "good" quality, and
nuclear@14 74 * when divided by 2, "very good" quality.
nuclear@14 75 */
nuclear@14 76 static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
nuclear@14 77 16, 11, 10, 16, 24, 40, 51, 61,
nuclear@14 78 12, 12, 14, 19, 26, 58, 60, 55,
nuclear@14 79 14, 13, 16, 24, 40, 57, 69, 56,
nuclear@14 80 14, 17, 22, 29, 51, 87, 80, 62,
nuclear@14 81 18, 22, 37, 56, 68, 109, 103, 77,
nuclear@14 82 24, 35, 55, 64, 81, 104, 113, 92,
nuclear@14 83 49, 64, 78, 87, 103, 121, 120, 101,
nuclear@14 84 72, 92, 95, 98, 112, 100, 103, 99
nuclear@14 85 };
nuclear@14 86 static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
nuclear@14 87 17, 18, 24, 47, 99, 99, 99, 99,
nuclear@14 88 18, 21, 26, 66, 99, 99, 99, 99,
nuclear@14 89 24, 26, 56, 99, 99, 99, 99, 99,
nuclear@14 90 47, 66, 99, 99, 99, 99, 99, 99,
nuclear@14 91 99, 99, 99, 99, 99, 99, 99, 99,
nuclear@14 92 99, 99, 99, 99, 99, 99, 99, 99,
nuclear@14 93 99, 99, 99, 99, 99, 99, 99, 99,
nuclear@14 94 99, 99, 99, 99, 99, 99, 99, 99
nuclear@14 95 };
nuclear@14 96
nuclear@14 97 /* Set up two quantization tables using the specified scaling */
nuclear@14 98 jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
nuclear@14 99 scale_factor, force_baseline);
nuclear@14 100 jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
nuclear@14 101 scale_factor, force_baseline);
nuclear@14 102 }
nuclear@14 103
nuclear@14 104
nuclear@14 105 GLOBAL(int)
nuclear@14 106 jpeg_quality_scaling (int quality)
nuclear@14 107 /* Convert a user-specified quality rating to a percentage scaling factor
nuclear@14 108 * for an underlying quantization table, using our recommended scaling curve.
nuclear@14 109 * The input 'quality' factor should be 0 (terrible) to 100 (very good).
nuclear@14 110 */
nuclear@14 111 {
nuclear@14 112 /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */
nuclear@14 113 if (quality <= 0) quality = 1;
nuclear@14 114 if (quality > 100) quality = 100;
nuclear@14 115
nuclear@14 116 /* The basic table is used as-is (scaling 100) for a quality of 50.
nuclear@14 117 * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
nuclear@14 118 * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
nuclear@14 119 * to make all the table entries 1 (hence, minimum quantization loss).
nuclear@14 120 * Qualities 1..50 are converted to scaling percentage 5000/Q.
nuclear@14 121 */
nuclear@14 122 if (quality < 50)
nuclear@14 123 quality = 5000 / quality;
nuclear@14 124 else
nuclear@14 125 quality = 200 - quality*2;
nuclear@14 126
nuclear@14 127 return quality;
nuclear@14 128 }
nuclear@14 129
nuclear@14 130
nuclear@14 131 GLOBAL(void)
nuclear@14 132 jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
nuclear@14 133 /* Set or change the 'quality' (quantization) setting, using default tables.
nuclear@14 134 * This is the standard quality-adjusting entry point for typical user
nuclear@14 135 * interfaces; only those who want detailed control over quantization tables
nuclear@14 136 * would use the preceding three routines directly.
nuclear@14 137 */
nuclear@14 138 {
nuclear@14 139 /* Convert user 0-100 rating to percentage scaling */
nuclear@14 140 quality = jpeg_quality_scaling(quality);
nuclear@14 141
nuclear@14 142 /* Set up standard quality tables */
nuclear@14 143 jpeg_set_linear_quality(cinfo, quality, force_baseline);
nuclear@14 144 }
nuclear@14 145
nuclear@14 146
nuclear@14 147 /*
nuclear@14 148 * Huffman table setup routines
nuclear@14 149 */
nuclear@14 150
nuclear@14 151 LOCAL(void)
nuclear@14 152 add_huff_table (j_compress_ptr cinfo,
nuclear@14 153 JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
nuclear@14 154 /* Define a Huffman table */
nuclear@14 155 {
nuclear@14 156 int nsymbols, len;
nuclear@14 157
nuclear@14 158 if (*htblptr == NULL)
nuclear@14 159 *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
nuclear@14 160
nuclear@14 161 /* Copy the number-of-symbols-of-each-code-length counts */
nuclear@14 162 MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
nuclear@14 163
nuclear@14 164 /* Validate the counts. We do this here mainly so we can copy the right
nuclear@14 165 * number of symbols from the val[] array, without risking marching off
nuclear@14 166 * the end of memory. jchuff.c will do a more thorough test later.
nuclear@14 167 */
nuclear@14 168 nsymbols = 0;
nuclear@14 169 for (len = 1; len <= 16; len++)
nuclear@14 170 nsymbols += bits[len];
nuclear@14 171 if (nsymbols < 1 || nsymbols > 256)
nuclear@14 172 ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
nuclear@14 173
nuclear@14 174 MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));
nuclear@14 175
nuclear@14 176 /* Initialize sent_table FALSE so table will be written to JPEG file. */
nuclear@14 177 (*htblptr)->sent_table = FALSE;
nuclear@14 178 }
nuclear@14 179
nuclear@14 180
nuclear@14 181 LOCAL(void)
nuclear@14 182 std_huff_tables (j_compress_ptr cinfo)
nuclear@14 183 /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
nuclear@14 184 /* IMPORTANT: these are only valid for 8-bit data precision! */
nuclear@14 185 {
nuclear@14 186 static const UINT8 bits_dc_luminance[17] =
nuclear@14 187 { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
nuclear@14 188 static const UINT8 val_dc_luminance[] =
nuclear@14 189 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
nuclear@14 190
nuclear@14 191 static const UINT8 bits_dc_chrominance[17] =
nuclear@14 192 { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
nuclear@14 193 static const UINT8 val_dc_chrominance[] =
nuclear@14 194 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
nuclear@14 195
nuclear@14 196 static const UINT8 bits_ac_luminance[17] =
nuclear@14 197 { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
nuclear@14 198 static const UINT8 val_ac_luminance[] =
nuclear@14 199 { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
nuclear@14 200 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
nuclear@14 201 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
nuclear@14 202 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
nuclear@14 203 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
nuclear@14 204 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
nuclear@14 205 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
nuclear@14 206 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
nuclear@14 207 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
nuclear@14 208 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
nuclear@14 209 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
nuclear@14 210 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
nuclear@14 211 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
nuclear@14 212 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
nuclear@14 213 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
nuclear@14 214 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
nuclear@14 215 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
nuclear@14 216 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
nuclear@14 217 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
nuclear@14 218 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
nuclear@14 219 0xf9, 0xfa };
nuclear@14 220
nuclear@14 221 static const UINT8 bits_ac_chrominance[17] =
nuclear@14 222 { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
nuclear@14 223 static const UINT8 val_ac_chrominance[] =
nuclear@14 224 { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
nuclear@14 225 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
nuclear@14 226 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
nuclear@14 227 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
nuclear@14 228 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
nuclear@14 229 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
nuclear@14 230 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
nuclear@14 231 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
nuclear@14 232 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
nuclear@14 233 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
nuclear@14 234 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
nuclear@14 235 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
nuclear@14 236 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
nuclear@14 237 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
nuclear@14 238 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
nuclear@14 239 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
nuclear@14 240 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
nuclear@14 241 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
nuclear@14 242 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
nuclear@14 243 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
nuclear@14 244 0xf9, 0xfa };
nuclear@14 245
nuclear@14 246 add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0],
nuclear@14 247 bits_dc_luminance, val_dc_luminance);
nuclear@14 248 add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0],
nuclear@14 249 bits_ac_luminance, val_ac_luminance);
nuclear@14 250 add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1],
nuclear@14 251 bits_dc_chrominance, val_dc_chrominance);
nuclear@14 252 add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1],
nuclear@14 253 bits_ac_chrominance, val_ac_chrominance);
nuclear@14 254 }
nuclear@14 255
nuclear@14 256
nuclear@14 257 /*
nuclear@14 258 * Default parameter setup for compression.
nuclear@14 259 *
nuclear@14 260 * Applications that don't choose to use this routine must do their
nuclear@14 261 * own setup of all these parameters. Alternately, you can call this
nuclear@14 262 * to establish defaults and then alter parameters selectively. This
nuclear@14 263 * is the recommended approach since, if we add any new parameters,
nuclear@14 264 * your code will still work (they'll be set to reasonable defaults).
nuclear@14 265 */
nuclear@14 266
nuclear@14 267 GLOBAL(void)
nuclear@14 268 jpeg_set_defaults (j_compress_ptr cinfo)
nuclear@14 269 {
nuclear@14 270 int i;
nuclear@14 271
nuclear@14 272 /* Safety check to ensure start_compress not called yet. */
nuclear@14 273 if (cinfo->global_state != CSTATE_START)
nuclear@14 274 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 275
nuclear@14 276 /* Allocate comp_info array large enough for maximum component count.
nuclear@14 277 * Array is made permanent in case application wants to compress
nuclear@14 278 * multiple images at same param settings.
nuclear@14 279 */
nuclear@14 280 if (cinfo->comp_info == NULL)
nuclear@14 281 cinfo->comp_info = (jpeg_component_info *)
nuclear@14 282 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
nuclear@14 283 MAX_COMPONENTS * SIZEOF(jpeg_component_info));
nuclear@14 284
nuclear@14 285 /* Initialize everything not dependent on the color space */
nuclear@14 286
nuclear@14 287 cinfo->data_precision = BITS_IN_JSAMPLE;
nuclear@14 288 /* Set up two quantization tables using default quality of 75 */
nuclear@14 289 jpeg_set_quality(cinfo, 75, TRUE);
nuclear@14 290 /* Set up two Huffman tables */
nuclear@14 291 std_huff_tables(cinfo);
nuclear@14 292
nuclear@14 293 /* Initialize default arithmetic coding conditioning */
nuclear@14 294 for (i = 0; i < NUM_ARITH_TBLS; i++) {
nuclear@14 295 cinfo->arith_dc_L[i] = 0;
nuclear@14 296 cinfo->arith_dc_U[i] = 1;
nuclear@14 297 cinfo->arith_ac_K[i] = 5;
nuclear@14 298 }
nuclear@14 299
nuclear@14 300 /* Default is no multiple-scan output */
nuclear@14 301 cinfo->scan_info = NULL;
nuclear@14 302 cinfo->num_scans = 0;
nuclear@14 303
nuclear@14 304 /* Expect normal source image, not raw downsampled data */
nuclear@14 305 cinfo->raw_data_in = FALSE;
nuclear@14 306
nuclear@14 307 /* Use Huffman coding, not arithmetic coding, by default */
nuclear@14 308 cinfo->arith_code = FALSE;
nuclear@14 309
nuclear@14 310 /* By default, don't do extra passes to optimize entropy coding */
nuclear@14 311 cinfo->optimize_coding = FALSE;
nuclear@14 312 /* The standard Huffman tables are only valid for 8-bit data precision.
nuclear@14 313 * If the precision is higher, force optimization on so that usable
nuclear@14 314 * tables will be computed. This test can be removed if default tables
nuclear@14 315 * are supplied that are valid for the desired precision.
nuclear@14 316 */
nuclear@14 317 if (cinfo->data_precision > 8)
nuclear@14 318 cinfo->optimize_coding = TRUE;
nuclear@14 319
nuclear@14 320 /* By default, use the simpler non-cosited sampling alignment */
nuclear@14 321 cinfo->CCIR601_sampling = FALSE;
nuclear@14 322
nuclear@14 323 /* No input smoothing */
nuclear@14 324 cinfo->smoothing_factor = 0;
nuclear@14 325
nuclear@14 326 /* DCT algorithm preference */
nuclear@14 327 cinfo->dct_method = JDCT_DEFAULT;
nuclear@14 328
nuclear@14 329 /* No restart markers */
nuclear@14 330 cinfo->restart_interval = 0;
nuclear@14 331 cinfo->restart_in_rows = 0;
nuclear@14 332
nuclear@14 333 /* Fill in default JFIF marker parameters. Note that whether the marker
nuclear@14 334 * will actually be written is determined by jpeg_set_colorspace.
nuclear@14 335 *
nuclear@14 336 * By default, the library emits JFIF version code 1.01.
nuclear@14 337 * An application that wants to emit JFIF 1.02 extension markers should set
nuclear@14 338 * JFIF_minor_version to 2. We could probably get away with just defaulting
nuclear@14 339 * to 1.02, but there may still be some decoders in use that will complain
nuclear@14 340 * about that; saying 1.01 should minimize compatibility problems.
nuclear@14 341 */
nuclear@14 342 cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
nuclear@14 343 cinfo->JFIF_minor_version = 1;
nuclear@14 344 cinfo->density_unit = 0; /* Pixel size is unknown by default */
nuclear@14 345 cinfo->X_density = 1; /* Pixel aspect ratio is square by default */
nuclear@14 346 cinfo->Y_density = 1;
nuclear@14 347
nuclear@14 348 /* Choose JPEG colorspace based on input space, set defaults accordingly */
nuclear@14 349
nuclear@14 350 jpeg_default_colorspace(cinfo);
nuclear@14 351 }
nuclear@14 352
nuclear@14 353
nuclear@14 354 /*
nuclear@14 355 * Select an appropriate JPEG colorspace for in_color_space.
nuclear@14 356 */
nuclear@14 357
nuclear@14 358 GLOBAL(void)
nuclear@14 359 jpeg_default_colorspace (j_compress_ptr cinfo)
nuclear@14 360 {
nuclear@14 361 switch (cinfo->in_color_space) {
nuclear@14 362 case JCS_GRAYSCALE:
nuclear@14 363 jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
nuclear@14 364 break;
nuclear@14 365 case JCS_RGB:
nuclear@14 366 jpeg_set_colorspace(cinfo, JCS_YCbCr);
nuclear@14 367 break;
nuclear@14 368 case JCS_YCbCr:
nuclear@14 369 jpeg_set_colorspace(cinfo, JCS_YCbCr);
nuclear@14 370 break;
nuclear@14 371 case JCS_CMYK:
nuclear@14 372 jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
nuclear@14 373 break;
nuclear@14 374 case JCS_YCCK:
nuclear@14 375 jpeg_set_colorspace(cinfo, JCS_YCCK);
nuclear@14 376 break;
nuclear@14 377 case JCS_UNKNOWN:
nuclear@14 378 jpeg_set_colorspace(cinfo, JCS_UNKNOWN);
nuclear@14 379 break;
nuclear@14 380 default:
nuclear@14 381 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
nuclear@14 382 }
nuclear@14 383 }
nuclear@14 384
nuclear@14 385
nuclear@14 386 /*
nuclear@14 387 * Set the JPEG colorspace, and choose colorspace-dependent default values.
nuclear@14 388 */
nuclear@14 389
nuclear@14 390 GLOBAL(void)
nuclear@14 391 jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
nuclear@14 392 {
nuclear@14 393 jpeg_component_info * compptr;
nuclear@14 394 int ci;
nuclear@14 395
nuclear@14 396 #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \
nuclear@14 397 (compptr = &cinfo->comp_info[index], \
nuclear@14 398 compptr->component_id = (id), \
nuclear@14 399 compptr->h_samp_factor = (hsamp), \
nuclear@14 400 compptr->v_samp_factor = (vsamp), \
nuclear@14 401 compptr->quant_tbl_no = (quant), \
nuclear@14 402 compptr->dc_tbl_no = (dctbl), \
nuclear@14 403 compptr->ac_tbl_no = (actbl) )
nuclear@14 404
nuclear@14 405 /* Safety check to ensure start_compress not called yet. */
nuclear@14 406 if (cinfo->global_state != CSTATE_START)
nuclear@14 407 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 408
nuclear@14 409 /* For all colorspaces, we use Q and Huff tables 0 for luminance components,
nuclear@14 410 * tables 1 for chrominance components.
nuclear@14 411 */
nuclear@14 412
nuclear@14 413 cinfo->jpeg_color_space = colorspace;
nuclear@14 414
nuclear@14 415 cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
nuclear@14 416 cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
nuclear@14 417
nuclear@14 418 switch (colorspace) {
nuclear@14 419 case JCS_GRAYSCALE:
nuclear@14 420 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
nuclear@14 421 cinfo->num_components = 1;
nuclear@14 422 /* JFIF specifies component ID 1 */
nuclear@14 423 SET_COMP(0, 1, 1,1, 0, 0,0);
nuclear@14 424 break;
nuclear@14 425 case JCS_RGB:
nuclear@14 426 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
nuclear@14 427 cinfo->num_components = 3;
nuclear@14 428 SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
nuclear@14 429 SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
nuclear@14 430 SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
nuclear@14 431 break;
nuclear@14 432 case JCS_YCbCr:
nuclear@14 433 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
nuclear@14 434 cinfo->num_components = 3;
nuclear@14 435 /* JFIF specifies component IDs 1,2,3 */
nuclear@14 436 /* We default to 2x2 subsamples of chrominance */
nuclear@14 437 SET_COMP(0, 1, 2,2, 0, 0,0);
nuclear@14 438 SET_COMP(1, 2, 1,1, 1, 1,1);
nuclear@14 439 SET_COMP(2, 3, 1,1, 1, 1,1);
nuclear@14 440 break;
nuclear@14 441 case JCS_CMYK:
nuclear@14 442 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
nuclear@14 443 cinfo->num_components = 4;
nuclear@14 444 SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
nuclear@14 445 SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
nuclear@14 446 SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
nuclear@14 447 SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
nuclear@14 448 break;
nuclear@14 449 case JCS_YCCK:
nuclear@14 450 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
nuclear@14 451 cinfo->num_components = 4;
nuclear@14 452 SET_COMP(0, 1, 2,2, 0, 0,0);
nuclear@14 453 SET_COMP(1, 2, 1,1, 1, 1,1);
nuclear@14 454 SET_COMP(2, 3, 1,1, 1, 1,1);
nuclear@14 455 SET_COMP(3, 4, 2,2, 0, 0,0);
nuclear@14 456 break;
nuclear@14 457 case JCS_UNKNOWN:
nuclear@14 458 cinfo->num_components = cinfo->input_components;
nuclear@14 459 if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
nuclear@14 460 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
nuclear@14 461 MAX_COMPONENTS);
nuclear@14 462 for (ci = 0; ci < cinfo->num_components; ci++) {
nuclear@14 463 SET_COMP(ci, ci, 1,1, 0, 0,0);
nuclear@14 464 }
nuclear@14 465 break;
nuclear@14 466 default:
nuclear@14 467 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
nuclear@14 468 }
nuclear@14 469 }
nuclear@14 470
nuclear@14 471
nuclear@14 472 #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@14 473
nuclear@14 474 LOCAL(jpeg_scan_info *)
nuclear@14 475 fill_a_scan (jpeg_scan_info * scanptr, int ci,
nuclear@14 476 int Ss, int Se, int Ah, int Al)
nuclear@14 477 /* Support routine: generate one scan for specified component */
nuclear@14 478 {
nuclear@14 479 scanptr->comps_in_scan = 1;
nuclear@14 480 scanptr->component_index[0] = ci;
nuclear@14 481 scanptr->Ss = Ss;
nuclear@14 482 scanptr->Se = Se;
nuclear@14 483 scanptr->Ah = Ah;
nuclear@14 484 scanptr->Al = Al;
nuclear@14 485 scanptr++;
nuclear@14 486 return scanptr;
nuclear@14 487 }
nuclear@14 488
nuclear@14 489 LOCAL(jpeg_scan_info *)
nuclear@14 490 fill_scans (jpeg_scan_info * scanptr, int ncomps,
nuclear@14 491 int Ss, int Se, int Ah, int Al)
nuclear@14 492 /* Support routine: generate one scan for each component */
nuclear@14 493 {
nuclear@14 494 int ci;
nuclear@14 495
nuclear@14 496 for (ci = 0; ci < ncomps; ci++) {
nuclear@14 497 scanptr->comps_in_scan = 1;
nuclear@14 498 scanptr->component_index[0] = ci;
nuclear@14 499 scanptr->Ss = Ss;
nuclear@14 500 scanptr->Se = Se;
nuclear@14 501 scanptr->Ah = Ah;
nuclear@14 502 scanptr->Al = Al;
nuclear@14 503 scanptr++;
nuclear@14 504 }
nuclear@14 505 return scanptr;
nuclear@14 506 }
nuclear@14 507
nuclear@14 508 LOCAL(jpeg_scan_info *)
nuclear@14 509 fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)
nuclear@14 510 /* Support routine: generate interleaved DC scan if possible, else N scans */
nuclear@14 511 {
nuclear@14 512 int ci;
nuclear@14 513
nuclear@14 514 if (ncomps <= MAX_COMPS_IN_SCAN) {
nuclear@14 515 /* Single interleaved DC scan */
nuclear@14 516 scanptr->comps_in_scan = ncomps;
nuclear@14 517 for (ci = 0; ci < ncomps; ci++)
nuclear@14 518 scanptr->component_index[ci] = ci;
nuclear@14 519 scanptr->Ss = scanptr->Se = 0;
nuclear@14 520 scanptr->Ah = Ah;
nuclear@14 521 scanptr->Al = Al;
nuclear@14 522 scanptr++;
nuclear@14 523 } else {
nuclear@14 524 /* Noninterleaved DC scan for each component */
nuclear@14 525 scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);
nuclear@14 526 }
nuclear@14 527 return scanptr;
nuclear@14 528 }
nuclear@14 529
nuclear@14 530
nuclear@14 531 /*
nuclear@14 532 * Create a recommended progressive-JPEG script.
nuclear@14 533 * cinfo->num_components and cinfo->jpeg_color_space must be correct.
nuclear@14 534 */
nuclear@14 535
nuclear@14 536 GLOBAL(void)
nuclear@14 537 jpeg_simple_progression (j_compress_ptr cinfo)
nuclear@14 538 {
nuclear@14 539 int ncomps = cinfo->num_components;
nuclear@14 540 int nscans;
nuclear@14 541 jpeg_scan_info * scanptr;
nuclear@14 542
nuclear@14 543 /* Safety check to ensure start_compress not called yet. */
nuclear@14 544 if (cinfo->global_state != CSTATE_START)
nuclear@14 545 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
nuclear@14 546
nuclear@14 547 /* Figure space needed for script. Calculation must match code below! */
nuclear@14 548 if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
nuclear@14 549 /* Custom script for YCbCr color images. */
nuclear@14 550 nscans = 10;
nuclear@14 551 } else {
nuclear@14 552 /* All-purpose script for other color spaces. */
nuclear@14 553 if (ncomps > MAX_COMPS_IN_SCAN)
nuclear@14 554 nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */
nuclear@14 555 else
nuclear@14 556 nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */
nuclear@14 557 }
nuclear@14 558
nuclear@14 559 /* Allocate space for script.
nuclear@14 560 * We need to put it in the permanent pool in case the application performs
nuclear@14 561 * multiple compressions without changing the settings. To avoid a memory
nuclear@14 562 * leak if jpeg_simple_progression is called repeatedly for the same JPEG
nuclear@14 563 * object, we try to re-use previously allocated space, and we allocate
nuclear@14 564 * enough space to handle YCbCr even if initially asked for grayscale.
nuclear@14 565 */
nuclear@14 566 if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
nuclear@14 567 cinfo->script_space_size = MAX(nscans, 10);
nuclear@14 568 cinfo->script_space = (jpeg_scan_info *)
nuclear@14 569 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
nuclear@14 570 cinfo->script_space_size * SIZEOF(jpeg_scan_info));
nuclear@14 571 }
nuclear@14 572 scanptr = cinfo->script_space;
nuclear@14 573 cinfo->scan_info = scanptr;
nuclear@14 574 cinfo->num_scans = nscans;
nuclear@14 575
nuclear@14 576 if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
nuclear@14 577 /* Custom script for YCbCr color images. */
nuclear@14 578 /* Initial DC scan */
nuclear@14 579 scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
nuclear@14 580 /* Initial AC scan: get some luma data out in a hurry */
nuclear@14 581 scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);
nuclear@14 582 /* Chroma data is too small to be worth expending many scans on */
nuclear@14 583 scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);
nuclear@14 584 scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);
nuclear@14 585 /* Complete spectral selection for luma AC */
nuclear@14 586 scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);
nuclear@14 587 /* Refine next bit of luma AC */
nuclear@14 588 scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
nuclear@14 589 /* Finish DC successive approximation */
nuclear@14 590 scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
nuclear@14 591 /* Finish AC successive approximation */
nuclear@14 592 scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);
nuclear@14 593 scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);
nuclear@14 594 /* Luma bottom bit comes last since it's usually largest scan */
nuclear@14 595 scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
nuclear@14 596 } else {
nuclear@14 597 /* All-purpose script for other color spaces. */
nuclear@14 598 /* Successive approximation first pass */
nuclear@14 599 scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
nuclear@14 600 scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);
nuclear@14 601 scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
nuclear@14 602 /* Successive approximation second pass */
nuclear@14 603 scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
nuclear@14 604 /* Successive approximation final pass */
nuclear@14 605 scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
nuclear@14 606 scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
nuclear@14 607 }
nuclear@14 608 }
nuclear@14 609
nuclear@14 610 #endif /* C_PROGRESSIVE_SUPPORTED */