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 <[email protected]> for Cendio AB
8 * Copyright (C) 2009-2012, 2015, 2022, 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
21
22 /* Private subobject */
23
24 typedef struct {
25 struct jpeg_color_converter pub; /* public fields */
26
27 /* Private state for RGB->YCC conversion */
28 JLONG *rgb_ycc_tab; /* => table for RGB to YCbCr conversion */
29 } my_color_converter;
30
31 typedef my_color_converter *my_cconvert_ptr;
32
33
34 /**************** RGB -> YCbCr conversion: most common case **************/
35
36 /*
37 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
38 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
39 * The conversion equations to be implemented are therefore
40 * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
41 * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE
42 * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE
43 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
44 * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
45 * rather than CENTERJSAMPLE, for Cb and Cr. This gave equal positive and
46 * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
47 * were not represented exactly. Now we sacrifice exact representation of
48 * maximum red and maximum blue in order to get exact grayscales.
49 *
50 * To avoid floating-point arithmetic, we represent the fractional constants
51 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
52 * the products by 2^16, with appropriate rounding, to get the correct answer.
53 *
54 * For even more speed, we avoid doing any multiplications in the inner loop
55 * by precalculating the constants times R,G,B for all possible values.
56 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
57 * for 12-bit samples it is still acceptable. It's not very reasonable for
58 * 16-bit samples, but if you want lossless storage you shouldn't be changing
59 * colorspace anyway.
60 * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
61 * in the tables to save adding them separately in the inner loop.
62 */
63
64 #define SCALEBITS 16 /* speediest right-shift on some machines */
65 #define CBCR_OFFSET ((JLONG)CENTERJSAMPLE << SCALEBITS)
66 #define ONE_HALF ((JLONG)1 << (SCALEBITS - 1))
67 #define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
68
69 /* We allocate one big table and divide it up into eight parts, instead of
70 * doing eight alloc_small requests. This lets us use a single table base
71 * address, which can be held in a register in the inner loops on many
72 * machines (more than can hold all eight addresses, anyway).
73 */
74
75 #define R_Y_OFF 0 /* offset to R => Y section */
76 #define G_Y_OFF (1 * (MAXJSAMPLE + 1)) /* offset to G => Y section */
77 #define B_Y_OFF (2 * (MAXJSAMPLE + 1)) /* etc. */
78 #define R_CB_OFF (3 * (MAXJSAMPLE + 1))
79 #define G_CB_OFF (4 * (MAXJSAMPLE + 1))
80 #define B_CB_OFF (5 * (MAXJSAMPLE + 1))
81 #define R_CR_OFF B_CB_OFF /* B=>Cb, R=>Cr are the same */
82 #define G_CR_OFF (6 * (MAXJSAMPLE + 1))
83 #define B_CR_OFF (7 * (MAXJSAMPLE + 1))
84 #define TABLE_SIZE (8 * (MAXJSAMPLE + 1))
85
86 /* 12-bit samples use a 16-bit data type, so it is possible to pass
87 * out-of-range sample values (< 0 or > 4095) to jpeg_write_scanlines().
88 * Thus, we mask the incoming 12-bit samples to guard against overrunning
89 * or underrunning the conversion tables.
90 */
91
92 #if BITS_IN_JSAMPLE == 12
93 #define RANGE_LIMIT(value) ((value) & 0xFFF)
94 #else
95 #define RANGE_LIMIT(value) (value)
96 #endif
97
98
99 /* Include inline routines for colorspace extensions */
100
101 #include "jccolext.c"
102 #undef RGB_RED
103 #undef RGB_GREEN
104 #undef RGB_BLUE
105 #undef RGB_PIXELSIZE
106
107 #define RGB_RED EXT_RGB_RED
108 #define RGB_GREEN EXT_RGB_GREEN
109 #define RGB_BLUE EXT_RGB_BLUE
110 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
111 #define rgb_ycc_convert_internal extrgb_ycc_convert_internal
112 #define rgb_gray_convert_internal extrgb_gray_convert_internal
113 #define rgb_rgb_convert_internal extrgb_rgb_convert_internal
114 #include "jccolext.c"
115 #undef RGB_RED
116 #undef RGB_GREEN
117 #undef RGB_BLUE
118 #undef RGB_PIXELSIZE
119 #undef rgb_ycc_convert_internal
120 #undef rgb_gray_convert_internal
121 #undef rgb_rgb_convert_internal
122
123 #define RGB_RED EXT_RGBX_RED
124 #define RGB_GREEN EXT_RGBX_GREEN
125 #define RGB_BLUE EXT_RGBX_BLUE
126 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
127 #define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
128 #define rgb_gray_convert_internal extrgbx_gray_convert_internal
129 #define rgb_rgb_convert_internal extrgbx_rgb_convert_internal
130 #include "jccolext.c"
131 #undef RGB_RED
132 #undef RGB_GREEN
133 #undef RGB_BLUE
134 #undef RGB_PIXELSIZE
135 #undef rgb_ycc_convert_internal
136 #undef rgb_gray_convert_internal
137 #undef rgb_rgb_convert_internal
138
139 #define RGB_RED EXT_BGR_RED
140 #define RGB_GREEN EXT_BGR_GREEN
141 #define RGB_BLUE EXT_BGR_BLUE
142 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
143 #define rgb_ycc_convert_internal extbgr_ycc_convert_internal
144 #define rgb_gray_convert_internal extbgr_gray_convert_internal
145 #define rgb_rgb_convert_internal extbgr_rgb_convert_internal
146 #include "jccolext.c"
147 #undef RGB_RED
148 #undef RGB_GREEN
149 #undef RGB_BLUE
150 #undef RGB_PIXELSIZE
151 #undef rgb_ycc_convert_internal
152 #undef rgb_gray_convert_internal
153 #undef rgb_rgb_convert_internal
154
155 #define RGB_RED EXT_BGRX_RED
156 #define RGB_GREEN EXT_BGRX_GREEN
157 #define RGB_BLUE EXT_BGRX_BLUE
158 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
159 #define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
160 #define rgb_gray_convert_internal extbgrx_gray_convert_internal
161 #define rgb_rgb_convert_internal extbgrx_rgb_convert_internal
162 #include "jccolext.c"
163 #undef RGB_RED
164 #undef RGB_GREEN
165 #undef RGB_BLUE
166 #undef RGB_PIXELSIZE
167 #undef rgb_ycc_convert_internal
168 #undef rgb_gray_convert_internal
169 #undef rgb_rgb_convert_internal
170
171 #define RGB_RED EXT_XBGR_RED
172 #define RGB_GREEN EXT_XBGR_GREEN
173 #define RGB_BLUE EXT_XBGR_BLUE
174 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
175 #define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
176 #define rgb_gray_convert_internal extxbgr_gray_convert_internal
177 #define rgb_rgb_convert_internal extxbgr_rgb_convert_internal
178 #include "jccolext.c"
179 #undef RGB_RED
180 #undef RGB_GREEN
181 #undef RGB_BLUE
182 #undef RGB_PIXELSIZE
183 #undef rgb_ycc_convert_internal
184 #undef rgb_gray_convert_internal
185 #undef rgb_rgb_convert_internal
186
187 #define RGB_RED EXT_XRGB_RED
188 #define RGB_GREEN EXT_XRGB_GREEN
189 #define RGB_BLUE EXT_XRGB_BLUE
190 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
191 #define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
192 #define rgb_gray_convert_internal extxrgb_gray_convert_internal
193 #define rgb_rgb_convert_internal extxrgb_rgb_convert_internal
194 #include "jccolext.c"
195 #undef RGB_RED
196 #undef RGB_GREEN
197 #undef RGB_BLUE
198 #undef RGB_PIXELSIZE
199 #undef rgb_ycc_convert_internal
200 #undef rgb_gray_convert_internal
201 #undef rgb_rgb_convert_internal
202
203
204 /*
205 * Initialize for RGB->YCC colorspace conversion.
206 */
207
208 METHODDEF(void)
rgb_ycc_start(j_compress_ptr cinfo)209 rgb_ycc_start(j_compress_ptr cinfo)
210 {
211 my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
212 JLONG *rgb_ycc_tab;
213 JLONG i;
214
215 /* Allocate and fill in the conversion tables. */
216 cconvert->rgb_ycc_tab = rgb_ycc_tab = (JLONG *)
217 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
218 (TABLE_SIZE * sizeof(JLONG)));
219
220 for (i = 0; i <= MAXJSAMPLE; i++) {
221 rgb_ycc_tab[i + R_Y_OFF] = FIX(0.29900) * i;
222 rgb_ycc_tab[i + G_Y_OFF] = FIX(0.58700) * i;
223 rgb_ycc_tab[i + B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
224 rgb_ycc_tab[i + R_CB_OFF] = (-FIX(0.16874)) * i;
225 rgb_ycc_tab[i + G_CB_OFF] = (-FIX(0.33126)) * i;
226 /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
227 * This ensures that the maximum output will round to MAXJSAMPLE
228 * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
229 */
230 rgb_ycc_tab[i + B_CB_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
231 /* B=>Cb and R=>Cr tables are the same
232 rgb_ycc_tab[i + R_CR_OFF] = FIX(0.50000) * i + CBCR_OFFSET + ONE_HALF - 1;
233 */
234 rgb_ycc_tab[i + G_CR_OFF] = (-FIX(0.41869)) * i;
235 rgb_ycc_tab[i + B_CR_OFF] = (-FIX(0.08131)) * i;
236 }
237 }
238
239
240 /*
241 * Convert some rows of samples to the JPEG colorspace.
242 */
243
244 METHODDEF(void)
rgb_ycc_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)245 rgb_ycc_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
246 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
247 {
248 switch (cinfo->in_color_space) {
249 case JCS_EXT_RGB:
250 extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
251 num_rows);
252 break;
253 case JCS_EXT_RGBX:
254 case JCS_EXT_RGBA:
255 extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
256 num_rows);
257 break;
258 case JCS_EXT_BGR:
259 extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
260 num_rows);
261 break;
262 case JCS_EXT_BGRX:
263 case JCS_EXT_BGRA:
264 extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
265 num_rows);
266 break;
267 case JCS_EXT_XBGR:
268 case JCS_EXT_ABGR:
269 extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
270 num_rows);
271 break;
272 case JCS_EXT_XRGB:
273 case JCS_EXT_ARGB:
274 extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
275 num_rows);
276 break;
277 default:
278 rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
279 num_rows);
280 break;
281 }
282 }
283
284
285 /**************** Cases other than RGB -> YCbCr **************/
286
287
288 /*
289 * Convert some rows of samples to the JPEG colorspace.
290 */
291
292 METHODDEF(void)
rgb_gray_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)293 rgb_gray_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
294 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
295 {
296 switch (cinfo->in_color_space) {
297 case JCS_EXT_RGB:
298 extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
299 num_rows);
300 break;
301 case JCS_EXT_RGBX:
302 case JCS_EXT_RGBA:
303 extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
304 num_rows);
305 break;
306 case JCS_EXT_BGR:
307 extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
308 num_rows);
309 break;
310 case JCS_EXT_BGRX:
311 case JCS_EXT_BGRA:
312 extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
313 num_rows);
314 break;
315 case JCS_EXT_XBGR:
316 case JCS_EXT_ABGR:
317 extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
318 num_rows);
319 break;
320 case JCS_EXT_XRGB:
321 case JCS_EXT_ARGB:
322 extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
323 num_rows);
324 break;
325 default:
326 rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
327 num_rows);
328 break;
329 }
330 }
331
332
333 /*
334 * Extended RGB to plain RGB conversion
335 */
336
337 METHODDEF(void)
rgb_rgb_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)338 rgb_rgb_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
339 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
340 {
341 switch (cinfo->in_color_space) {
342 case JCS_EXT_RGB:
343 extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
344 num_rows);
345 break;
346 case JCS_EXT_RGBX:
347 case JCS_EXT_RGBA:
348 extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
349 num_rows);
350 break;
351 case JCS_EXT_BGR:
352 extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
353 num_rows);
354 break;
355 case JCS_EXT_BGRX:
356 case JCS_EXT_BGRA:
357 extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
358 num_rows);
359 break;
360 case JCS_EXT_XBGR:
361 case JCS_EXT_ABGR:
362 extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
363 num_rows);
364 break;
365 case JCS_EXT_XRGB:
366 case JCS_EXT_ARGB:
367 extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
368 num_rows);
369 break;
370 default:
371 rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
372 num_rows);
373 break;
374 }
375 }
376
377
378 /*
379 * Convert some rows of samples to the JPEG colorspace.
380 * This version handles Adobe-style CMYK->YCCK conversion,
381 * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
382 * conversion as above, while passing K (black) unchanged.
383 * We assume rgb_ycc_start has been called.
384 */
385
386 METHODDEF(void)
cmyk_ycck_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)387 cmyk_ycck_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
388 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
389 {
390 my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
391 register int r, g, b;
392 register JLONG *ctab = cconvert->rgb_ycc_tab;
393 register JSAMPROW inptr;
394 register JSAMPROW outptr0, outptr1, outptr2, outptr3;
395 register JDIMENSION col;
396 JDIMENSION num_cols = cinfo->image_width;
397
398 while (--num_rows >= 0) {
399 inptr = *input_buf++;
400 outptr0 = output_buf[0][output_row];
401 outptr1 = output_buf[1][output_row];
402 outptr2 = output_buf[2][output_row];
403 outptr3 = output_buf[3][output_row];
404 output_row++;
405 for (col = 0; col < num_cols; col++) {
406 r = MAXJSAMPLE - RANGE_LIMIT(inptr[0]);
407 g = MAXJSAMPLE - RANGE_LIMIT(inptr[1]);
408 b = MAXJSAMPLE - RANGE_LIMIT(inptr[2]);
409 /* K passes through as-is */
410 outptr3[col] = inptr[3];
411 inptr += 4;
412 /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
413 * must be too; we do not need an explicit range-limiting operation.
414 * Hence the value being shifted is never negative, and we don't
415 * need the general RIGHT_SHIFT macro.
416 */
417 /* Y */
418 outptr0[col] = (JSAMPLE)((ctab[r + R_Y_OFF] + ctab[g + G_Y_OFF] +
419 ctab[b + B_Y_OFF]) >> SCALEBITS);
420 /* Cb */
421 outptr1[col] = (JSAMPLE)((ctab[r + R_CB_OFF] + ctab[g + G_CB_OFF] +
422 ctab[b + B_CB_OFF]) >> SCALEBITS);
423 /* Cr */
424 outptr2[col] = (JSAMPLE)((ctab[r + R_CR_OFF] + ctab[g + G_CR_OFF] +
425 ctab[b + B_CR_OFF]) >> SCALEBITS);
426 }
427 }
428 }
429
430
431 /*
432 * Convert some rows of samples to the JPEG colorspace.
433 * This version handles grayscale output with no conversion.
434 * The source can be either plain grayscale or YCbCr (since Y == gray).
435 */
436
437 METHODDEF(void)
grayscale_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)438 grayscale_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
439 JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows)
440 {
441 register JSAMPROW inptr;
442 register JSAMPROW outptr;
443 register JDIMENSION col;
444 JDIMENSION num_cols = cinfo->image_width;
445 int instride = cinfo->input_components;
446
447 while (--num_rows >= 0) {
448 inptr = *input_buf++;
449 outptr = output_buf[0][output_row];
450 output_row++;
451 for (col = 0; col < num_cols; col++) {
452 outptr[col] = inptr[0];
453 inptr += instride;
454 }
455 }
456 }
457
458
459 /*
460 * Convert some rows of samples to the JPEG colorspace.
461 * This version handles multi-component colorspaces without conversion.
462 * We assume input_components == num_components.
463 */
464
465 METHODDEF(void)
null_convert(j_compress_ptr cinfo,JSAMPARRAY input_buf,JSAMPIMAGE output_buf,JDIMENSION output_row,int num_rows)466 null_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
467 JDIMENSION output_row, int num_rows)
468 {
469 register JSAMPROW inptr;
470 register JSAMPROW outptr, outptr0, outptr1, outptr2, outptr3;
471 register JDIMENSION col;
472 register int ci;
473 int nc = cinfo->num_components;
474 JDIMENSION num_cols = cinfo->image_width;
475
476 if (nc == 3) {
477 while (--num_rows >= 0) {
478 inptr = *input_buf++;
479 outptr0 = output_buf[0][output_row];
480 outptr1 = output_buf[1][output_row];
481 outptr2 = output_buf[2][output_row];
482 output_row++;
483 for (col = 0; col < num_cols; col++) {
484 outptr0[col] = *inptr++;
485 outptr1[col] = *inptr++;
486 outptr2[col] = *inptr++;
487 }
488 }
489 } else if (nc == 4) {
490 while (--num_rows >= 0) {
491 inptr = *input_buf++;
492 outptr0 = output_buf[0][output_row];
493 outptr1 = output_buf[1][output_row];
494 outptr2 = output_buf[2][output_row];
495 outptr3 = output_buf[3][output_row];
496 output_row++;
497 for (col = 0; col < num_cols; col++) {
498 outptr0[col] = *inptr++;
499 outptr1[col] = *inptr++;
500 outptr2[col] = *inptr++;
501 outptr3[col] = *inptr++;
502 }
503 }
504 } else {
505 while (--num_rows >= 0) {
506 /* It seems fastest to make a separate pass for each component. */
507 for (ci = 0; ci < nc; ci++) {
508 inptr = *input_buf;
509 outptr = output_buf[ci][output_row];
510 for (col = 0; col < num_cols; col++) {
511 outptr[col] = inptr[ci];
512 inptr += nc;
513 }
514 }
515 input_buf++;
516 output_row++;
517 }
518 }
519 }
520
521
522 /*
523 * Empty method for start_pass.
524 */
525
526 METHODDEF(void)
null_method(j_compress_ptr cinfo)527 null_method(j_compress_ptr cinfo)
528 {
529 /* no work needed */
530 }
531
532
533 /*
534 * Module initialization routine for input colorspace conversion.
535 */
536
537 GLOBAL(void)
jinit_color_converter(j_compress_ptr cinfo)538 jinit_color_converter(j_compress_ptr cinfo)
539 {
540 my_cconvert_ptr cconvert;
541
542 cconvert = (my_cconvert_ptr)
543 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
544 sizeof(my_color_converter));
545 cinfo->cconvert = (struct jpeg_color_converter *)cconvert;
546 /* set start_pass to null method until we find out differently */
547 cconvert->pub.start_pass = null_method;
548
549 /* Make sure input_components agrees with in_color_space */
550 switch (cinfo->in_color_space) {
551 case JCS_GRAYSCALE:
552 if (cinfo->input_components != 1)
553 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
554 break;
555
556 case JCS_RGB:
557 case JCS_EXT_RGB:
558 case JCS_EXT_RGBX:
559 case JCS_EXT_BGR:
560 case JCS_EXT_BGRX:
561 case JCS_EXT_XBGR:
562 case JCS_EXT_XRGB:
563 case JCS_EXT_RGBA:
564 case JCS_EXT_BGRA:
565 case JCS_EXT_ABGR:
566 case JCS_EXT_ARGB:
567 if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
568 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
569 break;
570
571 case JCS_YCbCr:
572 if (cinfo->input_components != 3)
573 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
574 break;
575
576 case JCS_CMYK:
577 case JCS_YCCK:
578 if (cinfo->input_components != 4)
579 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
580 break;
581
582 default: /* JCS_UNKNOWN can be anything */
583 if (cinfo->input_components < 1)
584 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
585 break;
586 }
587
588 /* Check num_components, set conversion method based on requested space */
589 switch (cinfo->jpeg_color_space) {
590 case JCS_GRAYSCALE:
591 if (cinfo->num_components != 1)
592 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
593 if (cinfo->in_color_space == JCS_GRAYSCALE)
594 cconvert->pub.color_convert = grayscale_convert;
595 else if (cinfo->in_color_space == JCS_RGB ||
596 cinfo->in_color_space == JCS_EXT_RGB ||
597 cinfo->in_color_space == JCS_EXT_RGBX ||
598 cinfo->in_color_space == JCS_EXT_BGR ||
599 cinfo->in_color_space == JCS_EXT_BGRX ||
600 cinfo->in_color_space == JCS_EXT_XBGR ||
601 cinfo->in_color_space == JCS_EXT_XRGB ||
602 cinfo->in_color_space == JCS_EXT_RGBA ||
603 cinfo->in_color_space == JCS_EXT_BGRA ||
604 cinfo->in_color_space == JCS_EXT_ABGR ||
605 cinfo->in_color_space == JCS_EXT_ARGB) {
606 if (jsimd_can_rgb_gray())
607 cconvert->pub.color_convert = jsimd_rgb_gray_convert;
608 else {
609 cconvert->pub.start_pass = rgb_ycc_start;
610 cconvert->pub.color_convert = rgb_gray_convert;
611 }
612 } else if (cinfo->in_color_space == JCS_YCbCr)
613 cconvert->pub.color_convert = grayscale_convert;
614 else
615 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
616 break;
617
618 case JCS_RGB:
619 if (cinfo->num_components != 3)
620 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
621 if (rgb_red[cinfo->in_color_space] == 0 &&
622 rgb_green[cinfo->in_color_space] == 1 &&
623 rgb_blue[cinfo->in_color_space] == 2 &&
624 rgb_pixelsize[cinfo->in_color_space] == 3) {
625 #if defined(__mips__)
626 if (jsimd_c_can_null_convert())
627 cconvert->pub.color_convert = jsimd_c_null_convert;
628 else
629 #endif
630 cconvert->pub.color_convert = null_convert;
631 } else if (cinfo->in_color_space == JCS_RGB ||
632 cinfo->in_color_space == JCS_EXT_RGB ||
633 cinfo->in_color_space == JCS_EXT_RGBX ||
634 cinfo->in_color_space == JCS_EXT_BGR ||
635 cinfo->in_color_space == JCS_EXT_BGRX ||
636 cinfo->in_color_space == JCS_EXT_XBGR ||
637 cinfo->in_color_space == JCS_EXT_XRGB ||
638 cinfo->in_color_space == JCS_EXT_RGBA ||
639 cinfo->in_color_space == JCS_EXT_BGRA ||
640 cinfo->in_color_space == JCS_EXT_ABGR ||
641 cinfo->in_color_space == JCS_EXT_ARGB)
642 cconvert->pub.color_convert = rgb_rgb_convert;
643 else
644 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
645 break;
646
647 case JCS_YCbCr:
648 if (cinfo->num_components != 3)
649 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
650 if (cinfo->in_color_space == JCS_RGB ||
651 cinfo->in_color_space == JCS_EXT_RGB ||
652 cinfo->in_color_space == JCS_EXT_RGBX ||
653 cinfo->in_color_space == JCS_EXT_BGR ||
654 cinfo->in_color_space == JCS_EXT_BGRX ||
655 cinfo->in_color_space == JCS_EXT_XBGR ||
656 cinfo->in_color_space == JCS_EXT_XRGB ||
657 cinfo->in_color_space == JCS_EXT_RGBA ||
658 cinfo->in_color_space == JCS_EXT_BGRA ||
659 cinfo->in_color_space == JCS_EXT_ABGR ||
660 cinfo->in_color_space == JCS_EXT_ARGB) {
661 if (jsimd_can_rgb_ycc())
662 cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
663 else {
664 cconvert->pub.start_pass = rgb_ycc_start;
665 cconvert->pub.color_convert = rgb_ycc_convert;
666 }
667 } else if (cinfo->in_color_space == JCS_YCbCr) {
668 #if defined(__mips__)
669 if (jsimd_c_can_null_convert())
670 cconvert->pub.color_convert = jsimd_c_null_convert;
671 else
672 #endif
673 cconvert->pub.color_convert = null_convert;
674 } else
675 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
676 break;
677
678 case JCS_CMYK:
679 if (cinfo->num_components != 4)
680 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
681 if (cinfo->in_color_space == JCS_CMYK) {
682 #if defined(__mips__)
683 if (jsimd_c_can_null_convert())
684 cconvert->pub.color_convert = jsimd_c_null_convert;
685 else
686 #endif
687 cconvert->pub.color_convert = null_convert;
688 } else
689 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
690 break;
691
692 case JCS_YCCK:
693 if (cinfo->num_components != 4)
694 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
695 if (cinfo->in_color_space == JCS_CMYK) {
696 cconvert->pub.start_pass = rgb_ycc_start;
697 cconvert->pub.color_convert = cmyk_ycck_convert;
698 } else if (cinfo->in_color_space == JCS_YCCK) {
699 #if defined(__mips__)
700 if (jsimd_c_can_null_convert())
701 cconvert->pub.color_convert = jsimd_c_null_convert;
702 else
703 #endif
704 cconvert->pub.color_convert = null_convert;
705 } else
706 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
707 break;
708
709 default: /* allow null conversion of JCS_UNKNOWN */
710 if (cinfo->jpeg_color_space != cinfo->in_color_space ||
711 cinfo->num_components != cinfo->input_components)
712 ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
713 #if defined(__mips__)
714 if (jsimd_c_can_null_convert())
715 cconvert->pub.color_convert = jsimd_c_null_convert;
716 else
717 #endif
718 cconvert->pub.color_convert = null_convert;
719 break;
720 }
721 }
722