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, 2015, D. R. Commander.
9 * Copyright (C) 2014, MIPS Technologies, Inc., California.
10 * For conditions of distribution and use, see the accompanying README.ijg
11 * file.
12 *
13 * This file contains input colorspace conversion routines.
14 */
15
16 #define JPEG_INTERNALS
17 #include "jinclude.h"
18 #include "jpeglib.h"
19 #include "jsimd.h"
20 #include "jconfigint.h"
21
22
23 /* Private subobject */
24
25 typedef struct {
26 struct jpeg_color_converter pub; /* public fields */
27
28 /* Private state for RGB->YCC conversion */
29 JLONG *rgb_ycc_tab; /* => table for RGB to YCbCr conversion */
30 } my_color_converter;
31
32 typedef my_color_converter *my_cconvert_ptr;
33
34
35 /**************** RGB -> YCbCr conversion: most common case **************/
36
37 /*
38 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
39 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
40 * The conversion equations to be implemented are therefore
41 * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
42 * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
43 * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
44 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
45 * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
46 * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and
47 * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
48 * were not represented exactly. Now we sacrifice exact representation of
49 * maximum red and maximum blue in order to get exact grayscales.
50 *
51 * To avoid floating-point arithmetic, we represent the fractional constants
52 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
53 * the products by 2^16, with appropriate rounding, to get the correct answer.
54 *
55 * For even more speed, we avoid doing any multiplications in the inner loop
56 * by precalculating the constants times R,G,B for all possible values.
57 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
58 * for 12-bit samples it is still acceptable. It's not very reasonable for
59 * 16-bit samples, but if you want lossless storage you shouldn't be changing
60 * colorspace anyway.
61 * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
62 * in the tables to save adding them separately in the inner loop.
63 */
64
65 #define SCALEBITS 16 /* speediest right-shift on some machines */
66 #define CBCR_OFFSET ((JLONG)CENTERJSAMPLE << SCALEBITS)
67 #define ONE_HALF ((JLONG)1 << (SCALEBITS - 1))
68 #define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
69
70 /* We allocate one big table and divide it up into eight parts, instead of
71 * doing eight alloc_small requests. This lets us use a single table base
72 * address, which can be held in a register in the inner loops on many
73 * machines (more than can hold all eight addresses, anyway).
74 */
75
76 #define R_Y_OFF 0 /* offset to R => Y section */
77 #define G_Y_OFF (1 * (MAXJSAMPLE + 1)) /* offset to G => Y section */
78 #define B_Y_OFF (2 * (MAXJSAMPLE + 1)) /* etc. */
79 #define R_CB_OFF (3 * (MAXJSAMPLE + 1))
80 #define G_CB_OFF (4 * (MAXJSAMPLE + 1))
81 #define B_CB_OFF (5 * (MAXJSAMPLE + 1))
82 #define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */
83 #define G_CR_OFF (6 * (MAXJSAMPLE + 1))
84 #define B_CR_OFF (7 * (MAXJSAMPLE + 1))
85 #define TABLE_SIZE (8 * (MAXJSAMPLE + 1))
86
87
88 /* Include inline routines for colorspace extensions */
89
90 #include "jccolext.c"
91 #undef RGB_RED
92 #undef RGB_GREEN
93 #undef RGB_BLUE
94 #undef RGB_PIXELSIZE
95
96 #define RGB_RED EXT_RGB_RED
97 #define RGB_GREEN EXT_RGB_GREEN
98 #define RGB_BLUE EXT_RGB_BLUE
99 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
100 #define rgb_ycc_convert_internal extrgb_ycc_convert_internal
101 #define rgb_gray_convert_internal extrgb_gray_convert_internal
102 #define rgb_rgb_convert_internal extrgb_rgb_convert_internal
103 #include "jccolext.c"
104 #undef RGB_RED
105 #undef RGB_GREEN
106 #undef RGB_BLUE
107 #undef RGB_PIXELSIZE
108 #undef rgb_ycc_convert_internal
109 #undef rgb_gray_convert_internal
110 #undef rgb_rgb_convert_internal
111
112 #define RGB_RED EXT_RGBX_RED
113 #define RGB_GREEN EXT_RGBX_GREEN
114 #define RGB_BLUE EXT_RGBX_BLUE
115 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
116 #define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
117 #define rgb_gray_convert_internal extrgbx_gray_convert_internal
118 #define rgb_rgb_convert_internal extrgbx_rgb_convert_internal
119 #include "jccolext.c"
120 #undef RGB_RED
121 #undef RGB_GREEN
122 #undef RGB_BLUE
123 #undef RGB_PIXELSIZE
124 #undef rgb_ycc_convert_internal
125 #undef rgb_gray_convert_internal
126 #undef rgb_rgb_convert_internal
127
128 #define RGB_RED EXT_BGR_RED
129 #define RGB_GREEN EXT_BGR_GREEN
130 #define RGB_BLUE EXT_BGR_BLUE
131 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
132 #define rgb_ycc_convert_internal extbgr_ycc_convert_internal
133 #define rgb_gray_convert_internal extbgr_gray_convert_internal
134 #define rgb_rgb_convert_internal extbgr_rgb_convert_internal
135 #include "jccolext.c"
136 #undef RGB_RED
137 #undef RGB_GREEN
138 #undef RGB_BLUE
139 #undef RGB_PIXELSIZE
140 #undef rgb_ycc_convert_internal
141 #undef rgb_gray_convert_internal
142 #undef rgb_rgb_convert_internal
143
144 #define RGB_RED EXT_BGRX_RED
145 #define RGB_GREEN EXT_BGRX_GREEN
146 #define RGB_BLUE EXT_BGRX_BLUE
147 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
148 #define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
149 #define rgb_gray_convert_internal extbgrx_gray_convert_internal
150 #define rgb_rgb_convert_internal extbgrx_rgb_convert_internal
151 #include "jccolext.c"
152 #undef RGB_RED
153 #undef RGB_GREEN
154 #undef RGB_BLUE
155 #undef RGB_PIXELSIZE
156 #undef rgb_ycc_convert_internal
157 #undef rgb_gray_convert_internal
158 #undef rgb_rgb_convert_internal
159
160 #define RGB_RED EXT_XBGR_RED
161 #define RGB_GREEN EXT_XBGR_GREEN
162 #define RGB_BLUE EXT_XBGR_BLUE
163 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
164 #define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
165 #define rgb_gray_convert_internal extxbgr_gray_convert_internal
166 #define rgb_rgb_convert_internal extxbgr_rgb_convert_internal
167 #include "jccolext.c"
168 #undef RGB_RED
169 #undef RGB_GREEN
170 #undef RGB_BLUE
171 #undef RGB_PIXELSIZE
172 #undef rgb_ycc_convert_internal
173 #undef rgb_gray_convert_internal
174 #undef rgb_rgb_convert_internal
175
176 #define RGB_RED EXT_XRGB_RED
177 #define RGB_GREEN EXT_XRGB_GREEN
178 #define RGB_BLUE EXT_XRGB_BLUE
179 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
180 #define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
181 #define rgb_gray_convert_internal extxrgb_gray_convert_internal
182 #define rgb_rgb_convert_internal extxrgb_rgb_convert_internal
183 #include "jccolext.c"
184 #undef RGB_RED
185 #undef RGB_GREEN
186 #undef RGB_BLUE
187 #undef RGB_PIXELSIZE
188 #undef rgb_ycc_convert_internal
189 #undef rgb_gray_convert_internal
190 #undef rgb_rgb_convert_internal
191
192
193 /*
194 * Initialize for RGB->YCC colorspace conversion.
195 */
196
197 METHODDEF(void)
rgb_ycc_start(j_compress_ptr cinfo)198 rgb_ycc_start(j_compress_ptr cinfo)
199 {
200 my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
201 JLONG *rgb_ycc_tab;
202 JLONG i;
203
204 /* Allocate and fill in the conversion tables. */
205 cconvert->rgb_ycc_tab = rgb_ycc_tab = (JLONG *)
206 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
207 (TABLE_SIZE * sizeof(JLONG)));
208
209 for (i = 0; i <= MAXJSAMPLE; i++) {
210 rgb_ycc_tab[i + R_Y_OFF] = FIX(0.29900) * i;
211 rgb_ycc_tab[i + G_Y_OFF] = FIX(0.58700) * i;
212 rgb_ycc_tab[i + B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
213 rgb_ycc_tab[i + R_CB_OFF] = (-FIX(0.16874)) * i;
214 rgb_ycc_tab[i + G_CB_OFF] = (-FIX(0.33126)) * i;
215 /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
216 * This ensures that the maximum output will round to MAXJSAMPLE
217 * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
218 */
219 rgb_ycc_tab[i + B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
220 /* B=>Cb and R=>Cr tables are the same
221 rgb_ycc_tab[i + R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
222 */
223 rgb_ycc_tab[i + G_CR_OFF] = (-FIX(0.41869)) * i;
224 rgb_ycc_tab[i + B_CR_OFF] = (-FIX(0.08131)) * i;
225 }
226 }
227
228
229 /*
230 * Convert some rows of samples to the JPEG colorspace.
231 */
232
233 METHODDEF(void)
rgb_ycc_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)234 rgb_ycc_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
235 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
236 {
237 switch (cinfo->in_color_space) {
238 case JCS_EXT_RGB:
239 extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
240 num_rows);
241 break;
242 case JCS_EXT_RGBX:
243 case JCS_EXT_RGBA:
244 extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
245 num_rows);
246 break;
247 case JCS_EXT_BGR:
248 extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
249 num_rows);
250 break;
251 case JCS_EXT_BGRX:
252 case JCS_EXT_BGRA:
253 extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
254 num_rows);
255 break;
256 case JCS_EXT_XBGR:
257 case JCS_EXT_ABGR:
258 extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
259 num_rows);
260 break;
261 case JCS_EXT_XRGB:
262 case JCS_EXT_ARGB:
263 extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
264 num_rows);
265 break;
266 default:
267 rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
268 num_rows);
269 break;
270 }
271 }
272
273
274 /**************** Cases other than RGB -> YCbCr **************/
275
276
277 /*
278 * Convert some rows of samples to the JPEG colorspace.
279 */
280
281 METHODDEF(void)
rgb_gray_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)282 rgb_gray_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
283 JSAMPIMAGE output_buf, 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)
rgb_rgb_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)327 rgb_rgb_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
328 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
329 {
330 switch (cinfo->in_color_space) {
331 case JCS_EXT_RGB:
332 extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
333 num_rows);
334 break;
335 case JCS_EXT_RGBX:
336 case JCS_EXT_RGBA:
337 extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
338 num_rows);
339 break;
340 case JCS_EXT_BGR:
341 extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
342 num_rows);
343 break;
344 case JCS_EXT_BGRX:
345 case JCS_EXT_BGRA:
346 extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
347 num_rows);
348 break;
349 case JCS_EXT_XBGR:
350 case JCS_EXT_ABGR:
351 extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
352 num_rows);
353 break;
354 case JCS_EXT_XRGB:
355 case JCS_EXT_ARGB:
356 extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
357 num_rows);
358 break;
359 default:
360 rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
361 num_rows);
362 break;
363 }
364 }
365
366
367 /*
368 * Convert some rows of samples to the JPEG colorspace.
369 * This version handles Adobe-style CMYK->YCCK conversion,
370 * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
371 * conversion as above, while passing K (black) unchanged.
372 * We assume rgb_ycc_start has been called.
373 */
374
375 METHODDEF(void)
cmyk_ycck_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)376 cmyk_ycck_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
377 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
378 {
379 my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
380 register int r, g, b;
381 register JLONG *ctab = cconvert->rgb_ycc_tab;
382 register JSAMPROW inptr;
383 register JSAMPROW outptr0, outptr1, outptr2, outptr3;
384 register JDIMENSION col;
385 JDIMENSION num_cols = cinfo->image_width;
386
387 while (--num_rows >= 0) {
388 inptr = *input_buf++;
389 outptr0 = output_buf[0][output_row];
390 outptr1 = output_buf[1][output_row];
391 outptr2 = output_buf[2][output_row];
392 outptr3 = output_buf[3][output_row];
393 output_row++;
394 for (col = 0; col < num_cols; col++) {
395 r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
396 g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
397 b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
398 /* K passes through as-is */
399 outptr3[col] = inptr[3]; /* don't need GETJSAMPLE here */
400 inptr += 4;
401 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
402 * must be too; we do not need an explicit range-limiting operation.
403 * Hence the value being shifted is never negative, and we don't
404 * need the general RIGHT_SHIFT macro.
405 */
406 /* Y */
407 outptr0[col] = (JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
408 ctab[b + B_Y_OFF]) >> SCALEBITS);
409 /* Cb */
410 outptr1[col] = (JSAMPLE)((ctab[r + R_CB_OFF] + ctab[g + G_CB_OFF] +
411 ctab[b + B_CB_OFF]) >> SCALEBITS);
412 /* Cr */
413 outptr2[col] = (JSAMPLE)((ctab[r + R_CR_OFF] + ctab[g + G_CR_OFF] +
414 ctab[b + B_CR_OFF]) >> SCALEBITS);
415 }
416 }
417 }
418
419
420 /*
421 * Convert some rows of samples to the JPEG colorspace.
422 * This version handles grayscale output with no conversion.
423 * The source can be either plain grayscale or YCbCr (since Y == gray).
424 */
425
426 METHODDEF(void)
grayscale_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)427 grayscale_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
428 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
429 {
430 register JSAMPROW inptr;
431 register JSAMPROW outptr;
432 register JDIMENSION col;
433 JDIMENSION num_cols = cinfo->image_width;
434 int instride = cinfo->input_components;
435
436 while (--num_rows >= 0) {
437 inptr = *input_buf++;
438 outptr = output_buf[0][output_row];
439 output_row++;
440 for (col = 0; col < num_cols; col++) {
441 outptr[col] = inptr[0]; /* don't need GETJSAMPLE() here */
442 inptr += instride;
443 }
444 }
445 }
446
447
448 /*
449 * Convert some rows of samples to the JPEG colorspace.
450 * This version handles multi-component colorspaces without conversion.
451 * We assume input_components == num_components.
452 */
453
454 METHODDEF(void)
null_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)455 null_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
456 JDIMENSION output_row, int num_rows)
457 {
458 register JSAMPROW inptr;
459 register JSAMPROW outptr, outptr0, outptr1, outptr2, outptr3;
460 register JDIMENSION col;
461 register int ci;
462 int nc = cinfo->num_components;
463 JDIMENSION num_cols = cinfo->image_width;
464
465 if (nc == 3) {
466 while (--num_rows >= 0) {
467 inptr = *input_buf++;
468 outptr0 = output_buf[0][output_row];
469 outptr1 = output_buf[1][output_row];
470 outptr2 = output_buf[2][output_row];
471 output_row++;
472 for (col = 0; col < num_cols; col++) {
473 outptr0[col] = *inptr++;
474 outptr1[col] = *inptr++;
475 outptr2[col] = *inptr++;
476 }
477 }
478 } else if (nc == 4) {
479 while (--num_rows >= 0) {
480 inptr = *input_buf++;
481 outptr0 = output_buf[0][output_row];
482 outptr1 = output_buf[1][output_row];
483 outptr2 = output_buf[2][output_row];
484 outptr3 = output_buf[3][output_row];
485 output_row++;
486 for (col = 0; col < num_cols; col++) {
487 outptr0[col] = *inptr++;
488 outptr1[col] = *inptr++;
489 outptr2[col] = *inptr++;
490 outptr3[col] = *inptr++;
491 }
492 }
493 } else {
494 while (--num_rows >= 0) {
495 /* It seems fastest to make a separate pass for each component. */
496 for (ci = 0; ci < nc; ci++) {
497 inptr = *input_buf;
498 outptr = output_buf[ci][output_row];
499 for (col = 0; col < num_cols; col++) {
500 outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
501 inptr += nc;
502 }
503 }
504 input_buf++;
505 output_row++;
506 }
507 }
508 }
509
510
511 /*
512 * Empty method for start_pass.
513 */
514
515 METHODDEF(void)
null_method(j_compress_ptr cinfo)516 null_method(j_compress_ptr cinfo)
517 {
518 /* no work needed */
519 }
520
521
522 /*
523 * Module initialization routine for input colorspace conversion.
524 */
525
526 GLOBAL(void)
jinit_color_converter(j_compress_ptr cinfo)527 jinit_color_converter(j_compress_ptr cinfo)
528 {
529 my_cconvert_ptr cconvert;
530
531 cconvert = (my_cconvert_ptr)
532 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
533 sizeof(my_color_converter));
534 cinfo->cconvert = (struct jpeg_color_converter *)cconvert;
535 /* set start_pass to null method until we find out differently */
536 cconvert->pub.start_pass = null_method;
537
538 /* Make sure input_components agrees with in_color_space */
539 switch (cinfo->in_color_space) {
540 case JCS_GRAYSCALE:
541 if (cinfo->input_components != 1)
542 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
543 break;
544
545 case JCS_RGB:
546 case JCS_EXT_RGB:
547 case JCS_EXT_RGBX:
548 case JCS_EXT_BGR:
549 case JCS_EXT_BGRX:
550 case JCS_EXT_XBGR:
551 case JCS_EXT_XRGB:
552 case JCS_EXT_RGBA:
553 case JCS_EXT_BGRA:
554 case JCS_EXT_ABGR:
555 case JCS_EXT_ARGB:
556 if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
557 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
558 break;
559
560 case JCS_YCbCr:
561 if (cinfo->input_components != 3)
562 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
563 break;
564
565 case JCS_CMYK:
566 case JCS_YCCK:
567 if (cinfo->input_components != 4)
568 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
569 break;
570
571 default: /* JCS_UNKNOWN can be anything */
572 if (cinfo->input_components < 1)
573 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
574 break;
575 }
576
577 /* Check num_components, set conversion method based on requested space */
578 switch (cinfo->jpeg_color_space) {
579 case JCS_GRAYSCALE:
580 if (cinfo->num_components != 1)
581 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
582 if (cinfo->in_color_space == JCS_GRAYSCALE)
583 cconvert->pub.color_convert = grayscale_convert;
584 else if (cinfo->in_color_space == JCS_RGB ||
585 cinfo->in_color_space == JCS_EXT_RGB ||
586 cinfo->in_color_space == JCS_EXT_RGBX ||
587 cinfo->in_color_space == JCS_EXT_BGR ||
588 cinfo->in_color_space == JCS_EXT_BGRX ||
589 cinfo->in_color_space == JCS_EXT_XBGR ||
590 cinfo->in_color_space == JCS_EXT_XRGB ||
591 cinfo->in_color_space == JCS_EXT_RGBA ||
592 cinfo->in_color_space == JCS_EXT_BGRA ||
593 cinfo->in_color_space == JCS_EXT_ABGR ||
594 cinfo->in_color_space == JCS_EXT_ARGB) {
595 if (jsimd_can_rgb_gray())
596 cconvert->pub.color_convert = jsimd_rgb_gray_convert;
597 else {
598 cconvert->pub.start_pass = rgb_ycc_start;
599 cconvert->pub.color_convert = rgb_gray_convert;
600 }
601 } else if (cinfo->in_color_space == JCS_YCbCr)
602 cconvert->pub.color_convert = grayscale_convert;
603 else
604 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
605 break;
606
607 case JCS_RGB:
608 if (cinfo->num_components != 3)
609 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
610 if (rgb_red[cinfo->in_color_space] == 0 &&
611 rgb_green[cinfo->in_color_space] == 1 &&
612 rgb_blue[cinfo->in_color_space] == 2 &&
613 rgb_pixelsize[cinfo->in_color_space] == 3) {
614 #if defined(__mips__)
615 if (jsimd_c_can_null_convert())
616 cconvert->pub.color_convert = jsimd_c_null_convert;
617 else
618 #endif
619 cconvert->pub.color_convert = null_convert;
620 } else if (cinfo->in_color_space == JCS_RGB ||
621 cinfo->in_color_space == JCS_EXT_RGB ||
622 cinfo->in_color_space == JCS_EXT_RGBX ||
623 cinfo->in_color_space == JCS_EXT_BGR ||
624 cinfo->in_color_space == JCS_EXT_BGRX ||
625 cinfo->in_color_space == JCS_EXT_XBGR ||
626 cinfo->in_color_space == JCS_EXT_XRGB ||
627 cinfo->in_color_space == JCS_EXT_RGBA ||
628 cinfo->in_color_space == JCS_EXT_BGRA ||
629 cinfo->in_color_space == JCS_EXT_ABGR ||
630 cinfo->in_color_space == JCS_EXT_ARGB)
631 cconvert->pub.color_convert = rgb_rgb_convert;
632 else
633 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
634 break;
635
636 case JCS_YCbCr:
637 if (cinfo->num_components != 3)
638 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
639 if (cinfo->in_color_space == JCS_RGB ||
640 cinfo->in_color_space == JCS_EXT_RGB ||
641 cinfo->in_color_space == JCS_EXT_RGBX ||
642 cinfo->in_color_space == JCS_EXT_BGR ||
643 cinfo->in_color_space == JCS_EXT_BGRX ||
644 cinfo->in_color_space == JCS_EXT_XBGR ||
645 cinfo->in_color_space == JCS_EXT_XRGB ||
646 cinfo->in_color_space == JCS_EXT_RGBA ||
647 cinfo->in_color_space == JCS_EXT_BGRA ||
648 cinfo->in_color_space == JCS_EXT_ABGR ||
649 cinfo->in_color_space == JCS_EXT_ARGB) {
650 if (jsimd_can_rgb_ycc())
651 cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
652 else {
653 cconvert->pub.start_pass = rgb_ycc_start;
654 cconvert->pub.color_convert = rgb_ycc_convert;
655 }
656 } else if (cinfo->in_color_space == JCS_YCbCr) {
657 #if defined(__mips__)
658 if (jsimd_c_can_null_convert())
659 cconvert->pub.color_convert = jsimd_c_null_convert;
660 else
661 #endif
662 cconvert->pub.color_convert = null_convert;
663 } else
664 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
665 break;
666
667 case JCS_CMYK:
668 if (cinfo->num_components != 4)
669 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
670 if (cinfo->in_color_space == JCS_CMYK) {
671 #if defined(__mips__)
672 if (jsimd_c_can_null_convert())
673 cconvert->pub.color_convert = jsimd_c_null_convert;
674 else
675 #endif
676 cconvert->pub.color_convert = null_convert;
677 } else
678 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
679 break;
680
681 case JCS_YCCK:
682 if (cinfo->num_components != 4)
683 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
684 if (cinfo->in_color_space == JCS_CMYK) {
685 cconvert->pub.start_pass = rgb_ycc_start;
686 cconvert->pub.color_convert = cmyk_ycck_convert;
687 } else if (cinfo->in_color_space == JCS_YCCK) {
688 #if defined(__mips__)
689 if (jsimd_c_can_null_convert())
690 cconvert->pub.color_convert = jsimd_c_null_convert;
691 else
692 #endif
693 cconvert->pub.color_convert = null_convert;
694 } else
695 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
696 break;
697
698 default: /* allow null conversion of JCS_UNKNOWN */
699 if (cinfo->jpeg_color_space != cinfo->in_color_space ||
700 cinfo->num_components != cinfo->input_components)
701 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
702 #if defined(__mips__)
703 if (jsimd_c_can_null_convert())
704 cconvert->pub.color_convert = jsimd_c_null_convert;
705 else
706 #endif
707 cconvert->pub.color_convert = null_convert;
708 break;
709 }
710 }
711