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annotate libs/libjpeg/jccolor.c @ 14:06dc8b9b4f89

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
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rev   line source
nuclear@14 1 /*
nuclear@14 2 * jccolor.c
nuclear@14 3 *
nuclear@14 4 * Copyright (C) 1991-1996, 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 input colorspace conversion routines.
nuclear@14 9 */
nuclear@14 10
nuclear@14 11 #define JPEG_INTERNALS
nuclear@14 12 #include "jinclude.h"
nuclear@14 13 #include "jpeglib.h"
nuclear@14 14
nuclear@14 15
nuclear@14 16 /* Private subobject */
nuclear@14 17
nuclear@14 18 typedef struct {
nuclear@14 19 struct jpeg_color_converter pub; /* public fields */
nuclear@14 20
nuclear@14 21 /* Private state for RGB->YCC conversion */
nuclear@14 22 INT32 * rgb_ycc_tab; /* => table for RGB to YCbCr conversion */
nuclear@14 23 } my_color_converter;
nuclear@14 24
nuclear@14 25 typedef my_color_converter * my_cconvert_ptr;
nuclear@14 26
nuclear@14 27
nuclear@14 28 /**************** RGB -> YCbCr conversion: most common case **************/
nuclear@14 29
nuclear@14 30 /*
nuclear@14 31 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
nuclear@14 32 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
nuclear@14 33 * The conversion equations to be implemented are therefore
nuclear@14 34 * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
nuclear@14 35 * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
nuclear@14 36 * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
nuclear@14 37 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
nuclear@14 38 * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
nuclear@14 39 * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and
nuclear@14 40 * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
nuclear@14 41 * were not represented exactly. Now we sacrifice exact representation of
nuclear@14 42 * maximum red and maximum blue in order to get exact grayscales.
nuclear@14 43 *
nuclear@14 44 * To avoid floating-point arithmetic, we represent the fractional constants
nuclear@14 45 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
nuclear@14 46 * the products by 2^16, with appropriate rounding, to get the correct answer.
nuclear@14 47 *
nuclear@14 48 * For even more speed, we avoid doing any multiplications in the inner loop
nuclear@14 49 * by precalculating the constants times R,G,B for all possible values.
nuclear@14 50 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
nuclear@14 51 * for 12-bit samples it is still acceptable. It's not very reasonable for
nuclear@14 52 * 16-bit samples, but if you want lossless storage you shouldn't be changing
nuclear@14 53 * colorspace anyway.
nuclear@14 54 * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
nuclear@14 55 * in the tables to save adding them separately in the inner loop.
nuclear@14 56 */
nuclear@14 57
nuclear@14 58 #define SCALEBITS 16 /* speediest right-shift on some machines */
nuclear@14 59 #define CBCR_OFFSET ((INT32) CENTERJSAMPLE << SCALEBITS)
nuclear@14 60 #define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
nuclear@14 61 #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
nuclear@14 62
nuclear@14 63 /* We allocate one big table and divide it up into eight parts, instead of
nuclear@14 64 * doing eight alloc_small requests. This lets us use a single table base
nuclear@14 65 * address, which can be held in a register in the inner loops on many
nuclear@14 66 * machines (more than can hold all eight addresses, anyway).
nuclear@14 67 */
nuclear@14 68
nuclear@14 69 #define R_Y_OFF 0 /* offset to R => Y section */
nuclear@14 70 #define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */
nuclear@14 71 #define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */
nuclear@14 72 #define R_CB_OFF (3*(MAXJSAMPLE+1))
nuclear@14 73 #define G_CB_OFF (4*(MAXJSAMPLE+1))
nuclear@14 74 #define B_CB_OFF (5*(MAXJSAMPLE+1))
nuclear@14 75 #define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */
nuclear@14 76 #define G_CR_OFF (6*(MAXJSAMPLE+1))
nuclear@14 77 #define B_CR_OFF (7*(MAXJSAMPLE+1))
nuclear@14 78 #define TABLE_SIZE (8*(MAXJSAMPLE+1))
nuclear@14 79
nuclear@14 80
nuclear@14 81 /*
nuclear@14 82 * Initialize for RGB->YCC colorspace conversion.
nuclear@14 83 */
nuclear@14 84
nuclear@14 85 METHODDEF(void)
nuclear@14 86 rgb_ycc_start (j_compress_ptr cinfo)
nuclear@14 87 {
nuclear@14 88 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
nuclear@14 89 INT32 * rgb_ycc_tab;
nuclear@14 90 INT32 i;
nuclear@14 91
nuclear@14 92 /* Allocate and fill in the conversion tables. */
nuclear@14 93 cconvert->rgb_ycc_tab = rgb_ycc_tab = (INT32 *)
nuclear@14 94 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 95 (TABLE_SIZE * SIZEOF(INT32)));
nuclear@14 96
nuclear@14 97 for (i = 0; i <= MAXJSAMPLE; i++) {
nuclear@14 98 rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i;
nuclear@14 99 rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i;
nuclear@14 100 rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
nuclear@14 101 rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i;
nuclear@14 102 rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i;
nuclear@14 103 /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
nuclear@14 104 * This ensures that the maximum output will round to MAXJSAMPLE
nuclear@14 105 * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
nuclear@14 106 */
nuclear@14 107 rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1;
nuclear@14 108 /* B=>Cb and R=>Cr tables are the same
nuclear@14 109 rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1;
nuclear@14 110 */
nuclear@14 111 rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i;
nuclear@14 112 rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i;
nuclear@14 113 }
nuclear@14 114 }
nuclear@14 115
nuclear@14 116
nuclear@14 117 /*
nuclear@14 118 * Convert some rows of samples to the JPEG colorspace.
nuclear@14 119 *
nuclear@14 120 * Note that we change from the application's interleaved-pixel format
nuclear@14 121 * to our internal noninterleaved, one-plane-per-component format.
nuclear@14 122 * The input buffer is therefore three times as wide as the output buffer.
nuclear@14 123 *
nuclear@14 124 * A starting row offset is provided only for the output buffer. The caller
nuclear@14 125 * can easily adjust the passed input_buf value to accommodate any row
nuclear@14 126 * offset required on that side.
nuclear@14 127 */
nuclear@14 128
nuclear@14 129 METHODDEF(void)
nuclear@14 130 rgb_ycc_convert (j_compress_ptr cinfo,
nuclear@14 131 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
nuclear@14 132 JDIMENSION output_row, int num_rows)
nuclear@14 133 {
nuclear@14 134 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
nuclear@14 135 register int r, g, b;
nuclear@14 136 register INT32 * ctab = cconvert->rgb_ycc_tab;
nuclear@14 137 register JSAMPROW inptr;
nuclear@14 138 register JSAMPROW outptr0, outptr1, outptr2;
nuclear@14 139 register JDIMENSION col;
nuclear@14 140 JDIMENSION num_cols = cinfo->image_width;
nuclear@14 141
nuclear@14 142 while (--num_rows >= 0) {
nuclear@14 143 inptr = *input_buf++;
nuclear@14 144 outptr0 = output_buf[0][output_row];
nuclear@14 145 outptr1 = output_buf[1][output_row];
nuclear@14 146 outptr2 = output_buf[2][output_row];
nuclear@14 147 output_row++;
nuclear@14 148 for (col = 0; col < num_cols; col++) {
nuclear@14 149 r = GETJSAMPLE(inptr[RGB_RED]);
nuclear@14 150 g = GETJSAMPLE(inptr[RGB_GREEN]);
nuclear@14 151 b = GETJSAMPLE(inptr[RGB_BLUE]);
nuclear@14 152 inptr += RGB_PIXELSIZE;
nuclear@14 153 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
nuclear@14 154 * must be too; we do not need an explicit range-limiting operation.
nuclear@14 155 * Hence the value being shifted is never negative, and we don't
nuclear@14 156 * need the general RIGHT_SHIFT macro.
nuclear@14 157 */
nuclear@14 158 /* Y */
nuclear@14 159 outptr0[col] = (JSAMPLE)
nuclear@14 160 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
nuclear@14 161 >> SCALEBITS);
nuclear@14 162 /* Cb */
nuclear@14 163 outptr1[col] = (JSAMPLE)
nuclear@14 164 ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
nuclear@14 165 >> SCALEBITS);
nuclear@14 166 /* Cr */
nuclear@14 167 outptr2[col] = (JSAMPLE)
nuclear@14 168 ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
nuclear@14 169 >> SCALEBITS);
nuclear@14 170 }
nuclear@14 171 }
nuclear@14 172 }
nuclear@14 173
nuclear@14 174
nuclear@14 175 /**************** Cases other than RGB -> YCbCr **************/
nuclear@14 176
nuclear@14 177
nuclear@14 178 /*
nuclear@14 179 * Convert some rows of samples to the JPEG colorspace.
nuclear@14 180 * This version handles RGB->grayscale conversion, which is the same
nuclear@14 181 * as the RGB->Y portion of RGB->YCbCr.
nuclear@14 182 * We assume rgb_ycc_start has been called (we only use the Y tables).
nuclear@14 183 */
nuclear@14 184
nuclear@14 185 METHODDEF(void)
nuclear@14 186 rgb_gray_convert (j_compress_ptr cinfo,
nuclear@14 187 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
nuclear@14 188 JDIMENSION output_row, int num_rows)
nuclear@14 189 {
nuclear@14 190 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
nuclear@14 191 register int r, g, b;
nuclear@14 192 register INT32 * ctab = cconvert->rgb_ycc_tab;
nuclear@14 193 register JSAMPROW inptr;
nuclear@14 194 register JSAMPROW outptr;
nuclear@14 195 register JDIMENSION col;
nuclear@14 196 JDIMENSION num_cols = cinfo->image_width;
nuclear@14 197
nuclear@14 198 while (--num_rows >= 0) {
nuclear@14 199 inptr = *input_buf++;
nuclear@14 200 outptr = output_buf[0][output_row];
nuclear@14 201 output_row++;
nuclear@14 202 for (col = 0; col < num_cols; col++) {
nuclear@14 203 r = GETJSAMPLE(inptr[RGB_RED]);
nuclear@14 204 g = GETJSAMPLE(inptr[RGB_GREEN]);
nuclear@14 205 b = GETJSAMPLE(inptr[RGB_BLUE]);
nuclear@14 206 inptr += RGB_PIXELSIZE;
nuclear@14 207 /* Y */
nuclear@14 208 outptr[col] = (JSAMPLE)
nuclear@14 209 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
nuclear@14 210 >> SCALEBITS);
nuclear@14 211 }
nuclear@14 212 }
nuclear@14 213 }
nuclear@14 214
nuclear@14 215
nuclear@14 216 /*
nuclear@14 217 * Convert some rows of samples to the JPEG colorspace.
nuclear@14 218 * This version handles Adobe-style CMYK->YCCK conversion,
nuclear@14 219 * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
nuclear@14 220 * conversion as above, while passing K (black) unchanged.
nuclear@14 221 * We assume rgb_ycc_start has been called.
nuclear@14 222 */
nuclear@14 223
nuclear@14 224 METHODDEF(void)
nuclear@14 225 cmyk_ycck_convert (j_compress_ptr cinfo,
nuclear@14 226 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
nuclear@14 227 JDIMENSION output_row, int num_rows)
nuclear@14 228 {
nuclear@14 229 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
nuclear@14 230 register int r, g, b;
nuclear@14 231 register INT32 * ctab = cconvert->rgb_ycc_tab;
nuclear@14 232 register JSAMPROW inptr;
nuclear@14 233 register JSAMPROW outptr0, outptr1, outptr2, outptr3;
nuclear@14 234 register JDIMENSION col;
nuclear@14 235 JDIMENSION num_cols = cinfo->image_width;
nuclear@14 236
nuclear@14 237 while (--num_rows >= 0) {
nuclear@14 238 inptr = *input_buf++;
nuclear@14 239 outptr0 = output_buf[0][output_row];
nuclear@14 240 outptr1 = output_buf[1][output_row];
nuclear@14 241 outptr2 = output_buf[2][output_row];
nuclear@14 242 outptr3 = output_buf[3][output_row];
nuclear@14 243 output_row++;
nuclear@14 244 for (col = 0; col < num_cols; col++) {
nuclear@14 245 r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
nuclear@14 246 g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
nuclear@14 247 b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
nuclear@14 248 /* K passes through as-is */
nuclear@14 249 outptr3[col] = inptr[3]; /* don't need GETJSAMPLE here */
nuclear@14 250 inptr += 4;
nuclear@14 251 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
nuclear@14 252 * must be too; we do not need an explicit range-limiting operation.
nuclear@14 253 * Hence the value being shifted is never negative, and we don't
nuclear@14 254 * need the general RIGHT_SHIFT macro.
nuclear@14 255 */
nuclear@14 256 /* Y */
nuclear@14 257 outptr0[col] = (JSAMPLE)
nuclear@14 258 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
nuclear@14 259 >> SCALEBITS);
nuclear@14 260 /* Cb */
nuclear@14 261 outptr1[col] = (JSAMPLE)
nuclear@14 262 ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
nuclear@14 263 >> SCALEBITS);
nuclear@14 264 /* Cr */
nuclear@14 265 outptr2[col] = (JSAMPLE)
nuclear@14 266 ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
nuclear@14 267 >> SCALEBITS);
nuclear@14 268 }
nuclear@14 269 }
nuclear@14 270 }
nuclear@14 271
nuclear@14 272
nuclear@14 273 /*
nuclear@14 274 * Convert some rows of samples to the JPEG colorspace.
nuclear@14 275 * This version handles grayscale output with no conversion.
nuclear@14 276 * The source can be either plain grayscale or YCbCr (since Y == gray).
nuclear@14 277 */
nuclear@14 278
nuclear@14 279 METHODDEF(void)
nuclear@14 280 grayscale_convert (j_compress_ptr cinfo,
nuclear@14 281 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
nuclear@14 282 JDIMENSION output_row, int num_rows)
nuclear@14 283 {
nuclear@14 284 register JSAMPROW inptr;
nuclear@14 285 register JSAMPROW outptr;
nuclear@14 286 register JDIMENSION col;
nuclear@14 287 JDIMENSION num_cols = cinfo->image_width;
nuclear@14 288 int instride = cinfo->input_components;
nuclear@14 289
nuclear@14 290 while (--num_rows >= 0) {
nuclear@14 291 inptr = *input_buf++;
nuclear@14 292 outptr = output_buf[0][output_row];
nuclear@14 293 output_row++;
nuclear@14 294 for (col = 0; col < num_cols; col++) {
nuclear@14 295 outptr[col] = inptr[0]; /* don't need GETJSAMPLE() here */
nuclear@14 296 inptr += instride;
nuclear@14 297 }
nuclear@14 298 }
nuclear@14 299 }
nuclear@14 300
nuclear@14 301
nuclear@14 302 /*
nuclear@14 303 * Convert some rows of samples to the JPEG colorspace.
nuclear@14 304 * This version handles multi-component colorspaces without conversion.
nuclear@14 305 * We assume input_components == num_components.
nuclear@14 306 */
nuclear@14 307
nuclear@14 308 METHODDEF(void)
nuclear@14 309 null_convert (j_compress_ptr cinfo,
nuclear@14 310 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
nuclear@14 311 JDIMENSION output_row, int num_rows)
nuclear@14 312 {
nuclear@14 313 register JSAMPROW inptr;
nuclear@14 314 register JSAMPROW outptr;
nuclear@14 315 register JDIMENSION col;
nuclear@14 316 register int ci;
nuclear@14 317 int nc = cinfo->num_components;
nuclear@14 318 JDIMENSION num_cols = cinfo->image_width;
nuclear@14 319
nuclear@14 320 while (--num_rows >= 0) {
nuclear@14 321 /* It seems fastest to make a separate pass for each component. */
nuclear@14 322 for (ci = 0; ci < nc; ci++) {
nuclear@14 323 inptr = *input_buf;
nuclear@14 324 outptr = output_buf[ci][output_row];
nuclear@14 325 for (col = 0; col < num_cols; col++) {
nuclear@14 326 outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
nuclear@14 327 inptr += nc;
nuclear@14 328 }
nuclear@14 329 }
nuclear@14 330 input_buf++;
nuclear@14 331 output_row++;
nuclear@14 332 }
nuclear@14 333 }
nuclear@14 334
nuclear@14 335
nuclear@14 336 /*
nuclear@14 337 * Empty method for start_pass.
nuclear@14 338 */
nuclear@14 339
nuclear@14 340 METHODDEF(void)
nuclear@14 341 null_method (j_compress_ptr cinfo)
nuclear@14 342 {
nuclear@14 343 /* no work needed */
nuclear@14 344 }
nuclear@14 345
nuclear@14 346
nuclear@14 347 /*
nuclear@14 348 * Module initialization routine for input colorspace conversion.
nuclear@14 349 */
nuclear@14 350
nuclear@14 351 GLOBAL(void)
nuclear@14 352 jinit_color_converter (j_compress_ptr cinfo)
nuclear@14 353 {
nuclear@14 354 my_cconvert_ptr cconvert;
nuclear@14 355
nuclear@14 356 cconvert = (my_cconvert_ptr)
nuclear@14 357 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@14 358 SIZEOF(my_color_converter));
nuclear@14 359 cinfo->cconvert = (struct jpeg_color_converter *) cconvert;
nuclear@14 360 /* set start_pass to null method until we find out differently */
nuclear@14 361 cconvert->pub.start_pass = null_method;
nuclear@14 362
nuclear@14 363 /* Make sure input_components agrees with in_color_space */
nuclear@14 364 switch (cinfo->in_color_space) {
nuclear@14 365 case JCS_GRAYSCALE:
nuclear@14 366 if (cinfo->input_components != 1)
nuclear@14 367 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
nuclear@14 368 break;
nuclear@14 369
nuclear@14 370 case JCS_RGB:
nuclear@14 371 #if RGB_PIXELSIZE != 3
nuclear@14 372 if (cinfo->input_components != RGB_PIXELSIZE)
nuclear@14 373 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
nuclear@14 374 break;
nuclear@14 375 #endif /* else share code with YCbCr */
nuclear@14 376
nuclear@14 377 case JCS_YCbCr:
nuclear@14 378 if (cinfo->input_components != 3)
nuclear@14 379 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
nuclear@14 380 break;
nuclear@14 381
nuclear@14 382 case JCS_CMYK:
nuclear@14 383 case JCS_YCCK:
nuclear@14 384 if (cinfo->input_components != 4)
nuclear@14 385 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
nuclear@14 386 break;
nuclear@14 387
nuclear@14 388 default: /* JCS_UNKNOWN can be anything */
nuclear@14 389 if (cinfo->input_components < 1)
nuclear@14 390 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
nuclear@14 391 break;
nuclear@14 392 }
nuclear@14 393
nuclear@14 394 /* Check num_components, set conversion method based on requested space */
nuclear@14 395 switch (cinfo->jpeg_color_space) {
nuclear@14 396 case JCS_GRAYSCALE:
nuclear@14 397 if (cinfo->num_components != 1)
nuclear@14 398 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
nuclear@14 399 if (cinfo->in_color_space == JCS_GRAYSCALE)
nuclear@14 400 cconvert->pub.color_convert = grayscale_convert;
nuclear@14 401 else if (cinfo->in_color_space == JCS_RGB) {
nuclear@14 402 cconvert->pub.start_pass = rgb_ycc_start;
nuclear@14 403 cconvert->pub.color_convert = rgb_gray_convert;
nuclear@14 404 } else if (cinfo->in_color_space == JCS_YCbCr)
nuclear@14 405 cconvert->pub.color_convert = grayscale_convert;
nuclear@14 406 else
nuclear@14 407 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
nuclear@14 408 break;
nuclear@14 409
nuclear@14 410 case JCS_RGB:
nuclear@14 411 if (cinfo->num_components != 3)
nuclear@14 412 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
nuclear@14 413 if (cinfo->in_color_space == JCS_RGB && RGB_PIXELSIZE == 3)
nuclear@14 414 cconvert->pub.color_convert = null_convert;
nuclear@14 415 else
nuclear@14 416 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
nuclear@14 417 break;
nuclear@14 418
nuclear@14 419 case JCS_YCbCr:
nuclear@14 420 if (cinfo->num_components != 3)
nuclear@14 421 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
nuclear@14 422 if (cinfo->in_color_space == JCS_RGB) {
nuclear@14 423 cconvert->pub.start_pass = rgb_ycc_start;
nuclear@14 424 cconvert->pub.color_convert = rgb_ycc_convert;
nuclear@14 425 } else if (cinfo->in_color_space == JCS_YCbCr)
nuclear@14 426 cconvert->pub.color_convert = null_convert;
nuclear@14 427 else
nuclear@14 428 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
nuclear@14 429 break;
nuclear@14 430
nuclear@14 431 case JCS_CMYK:
nuclear@14 432 if (cinfo->num_components != 4)
nuclear@14 433 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
nuclear@14 434 if (cinfo->in_color_space == JCS_CMYK)
nuclear@14 435 cconvert->pub.color_convert = null_convert;
nuclear@14 436 else
nuclear@14 437 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
nuclear@14 438 break;
nuclear@14 439
nuclear@14 440 case JCS_YCCK:
nuclear@14 441 if (cinfo->num_components != 4)
nuclear@14 442 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
nuclear@14 443 if (cinfo->in_color_space == JCS_CMYK) {
nuclear@14 444 cconvert->pub.start_pass = rgb_ycc_start;
nuclear@14 445 cconvert->pub.color_convert = cmyk_ycck_convert;
nuclear@14 446 } else if (cinfo->in_color_space == JCS_YCCK)
nuclear@14 447 cconvert->pub.color_convert = null_convert;
nuclear@14 448 else
nuclear@14 449 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
nuclear@14 450 break;
nuclear@14 451
nuclear@14 452 default: /* allow null conversion of JCS_UNKNOWN */
nuclear@14 453 if (cinfo->jpeg_color_space != cinfo->in_color_space ||
nuclear@14 454 cinfo->num_components != cinfo->input_components)
nuclear@14 455 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
nuclear@14 456 cconvert->pub.color_convert = null_convert;
nuclear@14 457 break;
nuclear@14 458 }
nuclear@14 459 }