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comparison: media/libjpeg/jccolor.c
media/libjpeg/jccolor.c
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| -1:000000000000 | 0:b39520f33edb |
|---|---|
| 1 /* | |
| 2 * jccolor.c | |
| 3 * | |
| 4 * This file was part of the Independent JPEG Group's software: | |
| 5 * Copyright (C) 1991-1996, Thomas G. Lane. | |
| 6 * libjpeg-turbo Modifications: | |
| 7 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB | |
| 8 * Copyright (C) 2009-2012, D. R. Commander. | |
| 9 * For conditions of distribution and use, see the accompanying README file. | |
| 10 * | |
| 11 * This file contains input colorspace conversion routines. | |
| 12 */ | |
| 13 | |
| 14 #define JPEG_INTERNALS | |
| 15 #include "jinclude.h" | |
| 16 #include "jpeglib.h" | |
| 17 #include "jsimd.h" | |
| 18 #include "config.h" | |
| 19 | |
| 20 | |
| 21 /* Private subobject */ | |
| 22 | |
| 23 typedef struct { | |
| 24 struct jpeg_color_converter pub; /* public fields */ | |
| 25 | |
| 26 /* Private state for RGB->YCC conversion */ | |
| 27 INT32 * rgb_ycc_tab; /* => table for RGB to YCbCr conversion */ | |
| 28 } my_color_converter; | |
| 29 | |
| 30 typedef my_color_converter * my_cconvert_ptr; | |
| 31 | |
| 32 | |
| 33 /**************** RGB -> YCbCr conversion: most common case **************/ | |
| 34 | |
| 35 /* | |
| 36 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are | |
| 37 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. | |
| 38 * The conversion equations to be implemented are therefore | |
| 39 * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B | |
| 40 * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE | |
| 41 * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE | |
| 42 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.) | |
| 43 * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2, | |
| 44 * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and | |
| 45 * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0) | |
| 46 * were not represented exactly. Now we sacrifice exact representation of | |
| 47 * maximum red and maximum blue in order to get exact grayscales. | |
| 48 * | |
| 49 * To avoid floating-point arithmetic, we represent the fractional constants | |
| 50 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide | |
| 51 * the products by 2^16, with appropriate rounding, to get the correct answer. | |
| 52 * | |
| 53 * For even more speed, we avoid doing any multiplications in the inner loop | |
| 54 * by precalculating the constants times R,G,B for all possible values. | |
| 55 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table); | |
| 56 * for 12-bit samples it is still acceptable. It's not very reasonable for | |
| 57 * 16-bit samples, but if you want lossless storage you shouldn't be changing | |
| 58 * colorspace anyway. | |
| 59 * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included | |
| 60 * in the tables to save adding them separately in the inner loop. | |
| 61 */ | |
| 62 | |
| 63 #define SCALEBITS 16 /* speediest right-shift on some machines */ | |
| 64 #define CBCR_OFFSET ((INT32) CENTERJSAMPLE << SCALEBITS) | |
| 65 #define ONE_HALF ((INT32) 1 << (SCALEBITS-1)) | |
| 66 #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5)) | |
| 67 | |
| 68 /* We allocate one big table and divide it up into eight parts, instead of | |
| 69 * doing eight alloc_small requests. This lets us use a single table base | |
| 70 * address, which can be held in a register in the inner loops on many | |
| 71 * machines (more than can hold all eight addresses, anyway). | |
| 72 */ | |
| 73 | |
| 74 #define R_Y_OFF 0 /* offset to R => Y section */ | |
| 75 #define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */ | |
| 76 #define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */ | |
| 77 #define R_CB_OFF (3*(MAXJSAMPLE+1)) | |
| 78 #define G_CB_OFF (4*(MAXJSAMPLE+1)) | |
| 79 #define B_CB_OFF (5*(MAXJSAMPLE+1)) | |
| 80 #define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */ | |
| 81 #define G_CR_OFF (6*(MAXJSAMPLE+1)) | |
| 82 #define B_CR_OFF (7*(MAXJSAMPLE+1)) | |
| 83 #define TABLE_SIZE (8*(MAXJSAMPLE+1)) | |
| 84 | |
| 85 | |
| 86 /* Include inline routines for colorspace extensions */ | |
| 87 | |
| 88 #include "jccolext.c" | |
| 89 #undef RGB_RED | |
| 90 #undef RGB_GREEN | |
| 91 #undef RGB_BLUE | |
| 92 #undef RGB_PIXELSIZE | |
| 93 | |
| 94 #define RGB_RED EXT_RGB_RED | |
| 95 #define RGB_GREEN EXT_RGB_GREEN | |
| 96 #define RGB_BLUE EXT_RGB_BLUE | |
| 97 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE | |
| 98 #define rgb_ycc_convert_internal extrgb_ycc_convert_internal | |
| 99 #define rgb_gray_convert_internal extrgb_gray_convert_internal | |
| 100 #define rgb_rgb_convert_internal extrgb_rgb_convert_internal | |
| 101 #include "jccolext.c" | |
| 102 #undef RGB_RED | |
| 103 #undef RGB_GREEN | |
| 104 #undef RGB_BLUE | |
| 105 #undef RGB_PIXELSIZE | |
| 106 #undef rgb_ycc_convert_internal | |
| 107 #undef rgb_gray_convert_internal | |
| 108 #undef rgb_rgb_convert_internal | |
| 109 | |
| 110 #define RGB_RED EXT_RGBX_RED | |
| 111 #define RGB_GREEN EXT_RGBX_GREEN | |
| 112 #define RGB_BLUE EXT_RGBX_BLUE | |
| 113 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE | |
| 114 #define rgb_ycc_convert_internal extrgbx_ycc_convert_internal | |
| 115 #define rgb_gray_convert_internal extrgbx_gray_convert_internal | |
| 116 #define rgb_rgb_convert_internal extrgbx_rgb_convert_internal | |
| 117 #include "jccolext.c" | |
| 118 #undef RGB_RED | |
| 119 #undef RGB_GREEN | |
| 120 #undef RGB_BLUE | |
| 121 #undef RGB_PIXELSIZE | |
| 122 #undef rgb_ycc_convert_internal | |
| 123 #undef rgb_gray_convert_internal | |
| 124 #undef rgb_rgb_convert_internal | |
| 125 | |
| 126 #define RGB_RED EXT_BGR_RED | |
| 127 #define RGB_GREEN EXT_BGR_GREEN | |
| 128 #define RGB_BLUE EXT_BGR_BLUE | |
| 129 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE | |
| 130 #define rgb_ycc_convert_internal extbgr_ycc_convert_internal | |
| 131 #define rgb_gray_convert_internal extbgr_gray_convert_internal | |
| 132 #define rgb_rgb_convert_internal extbgr_rgb_convert_internal | |
| 133 #include "jccolext.c" | |
| 134 #undef RGB_RED | |
| 135 #undef RGB_GREEN | |
| 136 #undef RGB_BLUE | |
| 137 #undef RGB_PIXELSIZE | |
| 138 #undef rgb_ycc_convert_internal | |
| 139 #undef rgb_gray_convert_internal | |
| 140 #undef rgb_rgb_convert_internal | |
| 141 | |
| 142 #define RGB_RED EXT_BGRX_RED | |
| 143 #define RGB_GREEN EXT_BGRX_GREEN | |
| 144 #define RGB_BLUE EXT_BGRX_BLUE | |
| 145 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE | |
| 146 #define rgb_ycc_convert_internal extbgrx_ycc_convert_internal | |
| 147 #define rgb_gray_convert_internal extbgrx_gray_convert_internal | |
| 148 #define rgb_rgb_convert_internal extbgrx_rgb_convert_internal | |
| 149 #include "jccolext.c" | |
| 150 #undef RGB_RED | |
| 151 #undef RGB_GREEN | |
| 152 #undef RGB_BLUE | |
| 153 #undef RGB_PIXELSIZE | |
| 154 #undef rgb_ycc_convert_internal | |
| 155 #undef rgb_gray_convert_internal | |
| 156 #undef rgb_rgb_convert_internal | |
| 157 | |
| 158 #define RGB_RED EXT_XBGR_RED | |
| 159 #define RGB_GREEN EXT_XBGR_GREEN | |
| 160 #define RGB_BLUE EXT_XBGR_BLUE | |
| 161 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE | |
| 162 #define rgb_ycc_convert_internal extxbgr_ycc_convert_internal | |
| 163 #define rgb_gray_convert_internal extxbgr_gray_convert_internal | |
| 164 #define rgb_rgb_convert_internal extxbgr_rgb_convert_internal | |
| 165 #include "jccolext.c" | |
| 166 #undef RGB_RED | |
| 167 #undef RGB_GREEN | |
| 168 #undef RGB_BLUE | |
| 169 #undef RGB_PIXELSIZE | |
| 170 #undef rgb_ycc_convert_internal | |
| 171 #undef rgb_gray_convert_internal | |
| 172 #undef rgb_rgb_convert_internal | |
| 173 | |
| 174 #define RGB_RED EXT_XRGB_RED | |
| 175 #define RGB_GREEN EXT_XRGB_GREEN | |
| 176 #define RGB_BLUE EXT_XRGB_BLUE | |
| 177 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE | |
| 178 #define rgb_ycc_convert_internal extxrgb_ycc_convert_internal | |
| 179 #define rgb_gray_convert_internal extxrgb_gray_convert_internal | |
| 180 #define rgb_rgb_convert_internal extxrgb_rgb_convert_internal | |
| 181 #include "jccolext.c" | |
| 182 #undef RGB_RED | |
| 183 #undef RGB_GREEN | |
| 184 #undef RGB_BLUE | |
| 185 #undef RGB_PIXELSIZE | |
| 186 #undef rgb_ycc_convert_internal | |
| 187 #undef rgb_gray_convert_internal | |
| 188 #undef rgb_rgb_convert_internal | |
| 189 | |
| 190 | |
| 191 /* | |
| 192 * Initialize for RGB->YCC colorspace conversion. | |
| 193 */ | |
| 194 | |
| 195 METHODDEF(void) | |
| 196 rgb_ycc_start (j_compress_ptr cinfo) | |
| 197 { | |
| 198 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | |
| 199 INT32 * rgb_ycc_tab; | |
| 200 INT32 i; | |
| 201 | |
| 202 /* Allocate and fill in the conversion tables. */ | |
| 203 cconvert->rgb_ycc_tab = rgb_ycc_tab = (INT32 *) | |
| 204 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
| 205 (TABLE_SIZE * SIZEOF(INT32))); | |
| 206 | |
| 207 for (i = 0; i <= MAXJSAMPLE; i++) { | |
| 208 rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i; | |
| 209 rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i; | |
| 210 rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF; | |
| 211 rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i; | |
| 212 rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i; | |
| 213 /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr. | |
| 214 * This ensures that the maximum output will round to MAXJSAMPLE | |
| 215 * not MAXJSAMPLE+1, and thus that we don't have to range-limit. | |
| 216 */ | |
| 217 rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1; | |
| 218 /* B=>Cb and R=>Cr tables are the same | |
| 219 rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF-1; | |
| 220 */ | |
| 221 rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i; | |
| 222 rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 | |
| 227 /* | |
| 228 * Convert some rows of samples to the JPEG colorspace. | |
| 229 */ | |
| 230 | |
| 231 METHODDEF(void) | |
| 232 rgb_ycc_convert (j_compress_ptr cinfo, | |
| 233 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 234 JDIMENSION output_row, int num_rows) | |
| 235 { | |
| 236 switch (cinfo->in_color_space) { | |
| 237 case JCS_EXT_RGB: | |
| 238 extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 239 num_rows); | |
| 240 break; | |
| 241 case JCS_EXT_RGBX: | |
| 242 case JCS_EXT_RGBA: | |
| 243 extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 244 num_rows); | |
| 245 break; | |
| 246 case JCS_EXT_BGR: | |
| 247 extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 248 num_rows); | |
| 249 break; | |
| 250 case JCS_EXT_BGRX: | |
| 251 case JCS_EXT_BGRA: | |
| 252 extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 253 num_rows); | |
| 254 break; | |
| 255 case JCS_EXT_XBGR: | |
| 256 case JCS_EXT_ABGR: | |
| 257 extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 258 num_rows); | |
| 259 break; | |
| 260 case JCS_EXT_XRGB: | |
| 261 case JCS_EXT_ARGB: | |
| 262 extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 263 num_rows); | |
| 264 break; | |
| 265 default: | |
| 266 rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 267 num_rows); | |
| 268 break; | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 | |
| 273 /**************** Cases other than RGB -> YCbCr **************/ | |
| 274 | |
| 275 | |
| 276 /* | |
| 277 * Convert some rows of samples to the JPEG colorspace. | |
| 278 */ | |
| 279 | |
| 280 METHODDEF(void) | |
| 281 rgb_gray_convert (j_compress_ptr cinfo, | |
| 282 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 283 JDIMENSION output_row, int num_rows) | |
| 284 { | |
| 285 switch (cinfo->in_color_space) { | |
| 286 case JCS_EXT_RGB: | |
| 287 extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 288 num_rows); | |
| 289 break; | |
| 290 case JCS_EXT_RGBX: | |
| 291 case JCS_EXT_RGBA: | |
| 292 extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 293 num_rows); | |
| 294 break; | |
| 295 case JCS_EXT_BGR: | |
| 296 extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 297 num_rows); | |
| 298 break; | |
| 299 case JCS_EXT_BGRX: | |
| 300 case JCS_EXT_BGRA: | |
| 301 extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 302 num_rows); | |
| 303 break; | |
| 304 case JCS_EXT_XBGR: | |
| 305 case JCS_EXT_ABGR: | |
| 306 extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 307 num_rows); | |
| 308 break; | |
| 309 case JCS_EXT_XRGB: | |
| 310 case JCS_EXT_ARGB: | |
| 311 extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 312 num_rows); | |
| 313 break; | |
| 314 default: | |
| 315 rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 316 num_rows); | |
| 317 break; | |
| 318 } | |
| 319 } | |
| 320 | |
| 321 | |
| 322 /* | |
| 323 * Extended RGB to plain RGB conversion | |
| 324 */ | |
| 325 | |
| 326 METHODDEF(void) | |
| 327 rgb_rgb_convert (j_compress_ptr cinfo, | |
| 328 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 329 JDIMENSION output_row, int num_rows) | |
| 330 { | |
| 331 switch (cinfo->in_color_space) { | |
| 332 case JCS_EXT_RGB: | |
| 333 extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 334 num_rows); | |
| 335 break; | |
| 336 case JCS_EXT_RGBX: | |
| 337 case JCS_EXT_RGBA: | |
| 338 extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 339 num_rows); | |
| 340 break; | |
| 341 case JCS_EXT_BGR: | |
| 342 extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 343 num_rows); | |
| 344 break; | |
| 345 case JCS_EXT_BGRX: | |
| 346 case JCS_EXT_BGRA: | |
| 347 extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 348 num_rows); | |
| 349 break; | |
| 350 case JCS_EXT_XBGR: | |
| 351 case JCS_EXT_ABGR: | |
| 352 extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 353 num_rows); | |
| 354 break; | |
| 355 case JCS_EXT_XRGB: | |
| 356 case JCS_EXT_ARGB: | |
| 357 extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 358 num_rows); | |
| 359 break; | |
| 360 default: | |
| 361 rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row, | |
| 362 num_rows); | |
| 363 break; | |
| 364 } | |
| 365 } | |
| 366 | |
| 367 | |
| 368 /* | |
| 369 * Convert some rows of samples to the JPEG colorspace. | |
| 370 * This version handles Adobe-style CMYK->YCCK conversion, | |
| 371 * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same | |
| 372 * conversion as above, while passing K (black) unchanged. | |
| 373 * We assume rgb_ycc_start has been called. | |
| 374 */ | |
| 375 | |
| 376 METHODDEF(void) | |
| 377 cmyk_ycck_convert (j_compress_ptr cinfo, | |
| 378 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 379 JDIMENSION output_row, int num_rows) | |
| 380 { | |
| 381 my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | |
| 382 register int r, g, b; | |
| 383 register INT32 * ctab = cconvert->rgb_ycc_tab; | |
| 384 register JSAMPROW inptr; | |
| 385 register JSAMPROW outptr0, outptr1, outptr2, outptr3; | |
| 386 register JDIMENSION col; | |
| 387 JDIMENSION num_cols = cinfo->image_width; | |
| 388 | |
| 389 while (--num_rows >= 0) { | |
| 390 inptr = *input_buf++; | |
| 391 outptr0 = output_buf[0][output_row]; | |
| 392 outptr1 = output_buf[1][output_row]; | |
| 393 outptr2 = output_buf[2][output_row]; | |
| 394 outptr3 = output_buf[3][output_row]; | |
| 395 output_row++; | |
| 396 for (col = 0; col < num_cols; col++) { | |
| 397 r = MAXJSAMPLE - GETJSAMPLE(inptr[0]); | |
| 398 g = MAXJSAMPLE - GETJSAMPLE(inptr[1]); | |
| 399 b = MAXJSAMPLE - GETJSAMPLE(inptr[2]); | |
| 400 /* K passes through as-is */ | |
| 401 outptr3[col] = inptr[3]; /* don't need GETJSAMPLE here */ | |
| 402 inptr += 4; | |
| 403 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations | |
| 404 * must be too; we do not need an explicit range-limiting operation. | |
| 405 * Hence the value being shifted is never negative, and we don't | |
| 406 * need the general RIGHT_SHIFT macro. | |
| 407 */ | |
| 408 /* Y */ | |
| 409 outptr0[col] = (JSAMPLE) | |
| 410 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) | |
| 411 >> SCALEBITS); | |
| 412 /* Cb */ | |
| 413 outptr1[col] = (JSAMPLE) | |
| 414 ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF]) | |
| 415 >> SCALEBITS); | |
| 416 /* Cr */ | |
| 417 outptr2[col] = (JSAMPLE) | |
| 418 ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF]) | |
| 419 >> SCALEBITS); | |
| 420 } | |
| 421 } | |
| 422 } | |
| 423 | |
| 424 | |
| 425 /* | |
| 426 * Convert some rows of samples to the JPEG colorspace. | |
| 427 * This version handles grayscale output with no conversion. | |
| 428 * The source can be either plain grayscale or YCbCr (since Y == gray). | |
| 429 */ | |
| 430 | |
| 431 METHODDEF(void) | |
| 432 grayscale_convert (j_compress_ptr cinfo, | |
| 433 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 434 JDIMENSION output_row, int num_rows) | |
| 435 { | |
| 436 register JSAMPROW inptr; | |
| 437 register JSAMPROW outptr; | |
| 438 register JDIMENSION col; | |
| 439 JDIMENSION num_cols = cinfo->image_width; | |
| 440 int instride = cinfo->input_components; | |
| 441 | |
| 442 while (--num_rows >= 0) { | |
| 443 inptr = *input_buf++; | |
| 444 outptr = output_buf[0][output_row]; | |
| 445 output_row++; | |
| 446 for (col = 0; col < num_cols; col++) { | |
| 447 outptr[col] = inptr[0]; /* don't need GETJSAMPLE() here */ | |
| 448 inptr += instride; | |
| 449 } | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 | |
| 454 /* | |
| 455 * Convert some rows of samples to the JPEG colorspace. | |
| 456 * This version handles multi-component colorspaces without conversion. | |
| 457 * We assume input_components == num_components. | |
| 458 */ | |
| 459 | |
| 460 METHODDEF(void) | |
| 461 null_convert (j_compress_ptr cinfo, | |
| 462 JSAMPARRAY input_buf, JSAMPIMAGE output_buf, | |
| 463 JDIMENSION output_row, int num_rows) | |
| 464 { | |
| 465 register JSAMPROW inptr; | |
| 466 register JSAMPROW outptr; | |
| 467 register JDIMENSION col; | |
| 468 register int ci; | |
| 469 int nc = cinfo->num_components; | |
| 470 JDIMENSION num_cols = cinfo->image_width; | |
| 471 | |
| 472 while (--num_rows >= 0) { | |
| 473 /* It seems fastest to make a separate pass for each component. */ | |
| 474 for (ci = 0; ci < nc; ci++) { | |
| 475 inptr = *input_buf; | |
| 476 outptr = output_buf[ci][output_row]; | |
| 477 for (col = 0; col < num_cols; col++) { | |
| 478 outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */ | |
| 479 inptr += nc; | |
| 480 } | |
| 481 } | |
| 482 input_buf++; | |
| 483 output_row++; | |
| 484 } | |
| 485 } | |
| 486 | |
| 487 | |
| 488 /* | |
| 489 * Empty method for start_pass. | |
| 490 */ | |
| 491 | |
| 492 METHODDEF(void) | |
| 493 null_method (j_compress_ptr cinfo) | |
| 494 { | |
| 495 /* no work needed */ | |
| 496 } | |
| 497 | |
| 498 | |
| 499 /* | |
| 500 * Module initialization routine for input colorspace conversion. | |
| 501 */ | |
| 502 | |
| 503 GLOBAL(void) | |
| 504 jinit_color_converter (j_compress_ptr cinfo) | |
| 505 { | |
| 506 my_cconvert_ptr cconvert; | |
| 507 | |
| 508 cconvert = (my_cconvert_ptr) | |
| 509 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
| 510 SIZEOF(my_color_converter)); | |
| 511 cinfo->cconvert = (struct jpeg_color_converter *) cconvert; | |
| 512 /* set start_pass to null method until we find out differently */ | |
| 513 cconvert->pub.start_pass = null_method; | |
| 514 | |
| 515 /* Make sure input_components agrees with in_color_space */ | |
| 516 switch (cinfo->in_color_space) { | |
| 517 case JCS_GRAYSCALE: | |
| 518 if (cinfo->input_components != 1) | |
| 519 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | |
| 520 break; | |
| 521 | |
| 522 case JCS_RGB: | |
| 523 case JCS_EXT_RGB: | |
| 524 case JCS_EXT_RGBX: | |
| 525 case JCS_EXT_BGR: | |
| 526 case JCS_EXT_BGRX: | |
| 527 case JCS_EXT_XBGR: | |
| 528 case JCS_EXT_XRGB: | |
| 529 case JCS_EXT_RGBA: | |
| 530 case JCS_EXT_BGRA: | |
| 531 case JCS_EXT_ABGR: | |
| 532 case JCS_EXT_ARGB: | |
| 533 if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space]) | |
| 534 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | |
| 535 break; | |
| 536 | |
| 537 case JCS_YCbCr: | |
| 538 if (cinfo->input_components != 3) | |
| 539 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | |
| 540 break; | |
| 541 | |
| 542 case JCS_CMYK: | |
| 543 case JCS_YCCK: | |
| 544 if (cinfo->input_components != 4) | |
| 545 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | |
| 546 break; | |
| 547 | |
| 548 default: /* JCS_UNKNOWN can be anything */ | |
| 549 if (cinfo->input_components < 1) | |
| 550 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); | |
| 551 break; | |
| 552 } | |
| 553 | |
| 554 /* Check num_components, set conversion method based on requested space */ | |
| 555 switch (cinfo->jpeg_color_space) { | |
| 556 case JCS_GRAYSCALE: | |
| 557 if (cinfo->num_components != 1) | |
| 558 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | |
| 559 if (cinfo->in_color_space == JCS_GRAYSCALE) | |
| 560 cconvert->pub.color_convert = grayscale_convert; | |
| 561 else if (cinfo->in_color_space == JCS_RGB || | |
| 562 cinfo->in_color_space == JCS_EXT_RGB || | |
| 563 cinfo->in_color_space == JCS_EXT_RGBX || | |
| 564 cinfo->in_color_space == JCS_EXT_BGR || | |
| 565 cinfo->in_color_space == JCS_EXT_BGRX || | |
| 566 cinfo->in_color_space == JCS_EXT_XBGR || | |
| 567 cinfo->in_color_space == JCS_EXT_XRGB || | |
| 568 cinfo->in_color_space == JCS_EXT_RGBA || | |
| 569 cinfo->in_color_space == JCS_EXT_BGRA || | |
| 570 cinfo->in_color_space == JCS_EXT_ABGR || | |
| 571 cinfo->in_color_space == JCS_EXT_ARGB) { | |
| 572 if (jsimd_can_rgb_gray()) | |
| 573 cconvert->pub.color_convert = jsimd_rgb_gray_convert; | |
| 574 else { | |
| 575 cconvert->pub.start_pass = rgb_ycc_start; | |
| 576 cconvert->pub.color_convert = rgb_gray_convert; | |
| 577 } | |
| 578 } else if (cinfo->in_color_space == JCS_YCbCr) | |
| 579 cconvert->pub.color_convert = grayscale_convert; | |
| 580 else | |
| 581 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | |
| 582 break; | |
| 583 | |
| 584 case JCS_RGB: | |
| 585 if (cinfo->num_components != 3) | |
| 586 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | |
| 587 if (rgb_red[cinfo->in_color_space] == 0 && | |
| 588 rgb_green[cinfo->in_color_space] == 1 && | |
| 589 rgb_blue[cinfo->in_color_space] == 2 && | |
| 590 rgb_pixelsize[cinfo->in_color_space] == 3) | |
| 591 cconvert->pub.color_convert = null_convert; | |
| 592 else if (cinfo->in_color_space == JCS_RGB || | |
| 593 cinfo->in_color_space == JCS_EXT_RGB || | |
| 594 cinfo->in_color_space == JCS_EXT_RGBX || | |
| 595 cinfo->in_color_space == JCS_EXT_BGR || | |
| 596 cinfo->in_color_space == JCS_EXT_BGRX || | |
| 597 cinfo->in_color_space == JCS_EXT_XBGR || | |
| 598 cinfo->in_color_space == JCS_EXT_XRGB || | |
| 599 cinfo->in_color_space == JCS_EXT_RGBA || | |
| 600 cinfo->in_color_space == JCS_EXT_BGRA || | |
| 601 cinfo->in_color_space == JCS_EXT_ABGR || | |
| 602 cinfo->in_color_space == JCS_EXT_ARGB) | |
| 603 cconvert->pub.color_convert = rgb_rgb_convert; | |
| 604 else | |
| 605 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | |
| 606 break; | |
| 607 | |
| 608 case JCS_YCbCr: | |
| 609 if (cinfo->num_components != 3) | |
| 610 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | |
| 611 if (cinfo->in_color_space == JCS_RGB || | |
| 612 cinfo->in_color_space == JCS_EXT_RGB || | |
| 613 cinfo->in_color_space == JCS_EXT_RGBX || | |
| 614 cinfo->in_color_space == JCS_EXT_BGR || | |
| 615 cinfo->in_color_space == JCS_EXT_BGRX || | |
| 616 cinfo->in_color_space == JCS_EXT_XBGR || | |
| 617 cinfo->in_color_space == JCS_EXT_XRGB || | |
| 618 cinfo->in_color_space == JCS_EXT_RGBA || | |
| 619 cinfo->in_color_space == JCS_EXT_BGRA || | |
| 620 cinfo->in_color_space == JCS_EXT_ABGR || | |
| 621 cinfo->in_color_space == JCS_EXT_ARGB) { | |
| 622 if (jsimd_can_rgb_ycc()) | |
| 623 cconvert->pub.color_convert = jsimd_rgb_ycc_convert; | |
| 624 else { | |
| 625 cconvert->pub.start_pass = rgb_ycc_start; | |
| 626 cconvert->pub.color_convert = rgb_ycc_convert; | |
| 627 } | |
| 628 } else if (cinfo->in_color_space == JCS_YCbCr) | |
| 629 cconvert->pub.color_convert = null_convert; | |
| 630 else | |
| 631 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | |
| 632 break; | |
| 633 | |
| 634 case JCS_CMYK: | |
| 635 if (cinfo->num_components != 4) | |
| 636 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | |
| 637 if (cinfo->in_color_space == JCS_CMYK) | |
| 638 cconvert->pub.color_convert = null_convert; | |
| 639 else | |
| 640 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | |
| 641 break; | |
| 642 | |
| 643 case JCS_YCCK: | |
| 644 if (cinfo->num_components != 4) | |
| 645 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | |
| 646 if (cinfo->in_color_space == JCS_CMYK) { | |
| 647 cconvert->pub.start_pass = rgb_ycc_start; | |
| 648 cconvert->pub.color_convert = cmyk_ycck_convert; | |
| 649 } else if (cinfo->in_color_space == JCS_YCCK) | |
| 650 cconvert->pub.color_convert = null_convert; | |
| 651 else | |
| 652 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | |
| 653 break; | |
| 654 | |
| 655 default: /* allow null conversion of JCS_UNKNOWN */ | |
| 656 if (cinfo->jpeg_color_space != cinfo->in_color_space || | |
| 657 cinfo->num_components != cinfo->input_components) | |
| 658 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | |
| 659 cconvert->pub.color_convert = null_convert; | |
| 660 break; | |
| 661 } | |
| 662 } |
