Line data Source code
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)
198 0 : rgb_ycc_start (j_compress_ptr cinfo)
199 : {
200 0 : 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 0 : cconvert->rgb_ycc_tab = rgb_ycc_tab = (JLONG *)
206 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
207 : (TABLE_SIZE * sizeof(JLONG)));
208 :
209 0 : for (i = 0; i <= MAXJSAMPLE; i++) {
210 0 : rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i;
211 0 : rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i;
212 0 : rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
213 0 : rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i;
214 0 : 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 0 : 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 0 : rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i;
224 0 : rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i;
225 : }
226 0 : }
227 :
228 :
229 : /*
230 : * Convert some rows of samples to the JPEG colorspace.
231 : */
232 :
233 : METHODDEF(void)
234 0 : rgb_ycc_convert (j_compress_ptr cinfo,
235 : JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
236 : JDIMENSION output_row, int num_rows)
237 : {
238 0 : switch (cinfo->in_color_space) {
239 : case JCS_EXT_RGB:
240 0 : extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
241 : num_rows);
242 0 : break;
243 : case JCS_EXT_RGBX:
244 : case JCS_EXT_RGBA:
245 0 : extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
246 : num_rows);
247 0 : break;
248 : case JCS_EXT_BGR:
249 0 : extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
250 : num_rows);
251 0 : break;
252 : case JCS_EXT_BGRX:
253 : case JCS_EXT_BGRA:
254 0 : extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
255 : num_rows);
256 0 : break;
257 : case JCS_EXT_XBGR:
258 : case JCS_EXT_ABGR:
259 0 : extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
260 : num_rows);
261 0 : break;
262 : case JCS_EXT_XRGB:
263 : case JCS_EXT_ARGB:
264 0 : extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
265 : num_rows);
266 0 : break;
267 : default:
268 0 : rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
269 : num_rows);
270 0 : break;
271 : }
272 0 : }
273 :
274 :
275 : /**************** Cases other than RGB -> YCbCr **************/
276 :
277 :
278 : /*
279 : * Convert some rows of samples to the JPEG colorspace.
280 : */
281 :
282 : METHODDEF(void)
283 0 : rgb_gray_convert (j_compress_ptr cinfo,
284 : JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
285 : JDIMENSION output_row, int num_rows)
286 : {
287 0 : switch (cinfo->in_color_space) {
288 : case JCS_EXT_RGB:
289 0 : extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
290 : num_rows);
291 0 : break;
292 : case JCS_EXT_RGBX:
293 : case JCS_EXT_RGBA:
294 0 : extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
295 : num_rows);
296 0 : break;
297 : case JCS_EXT_BGR:
298 0 : extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
299 : num_rows);
300 0 : break;
301 : case JCS_EXT_BGRX:
302 : case JCS_EXT_BGRA:
303 0 : extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
304 : num_rows);
305 0 : break;
306 : case JCS_EXT_XBGR:
307 : case JCS_EXT_ABGR:
308 0 : extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
309 : num_rows);
310 0 : break;
311 : case JCS_EXT_XRGB:
312 : case JCS_EXT_ARGB:
313 0 : extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
314 : num_rows);
315 0 : break;
316 : default:
317 0 : rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
318 : num_rows);
319 0 : break;
320 : }
321 0 : }
322 :
323 :
324 : /*
325 : * Extended RGB to plain RGB conversion
326 : */
327 :
328 : METHODDEF(void)
329 0 : rgb_rgb_convert (j_compress_ptr cinfo,
330 : JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
331 : JDIMENSION output_row, int num_rows)
332 : {
333 0 : switch (cinfo->in_color_space) {
334 : case JCS_EXT_RGB:
335 0 : extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
336 : num_rows);
337 0 : break;
338 : case JCS_EXT_RGBX:
339 : case JCS_EXT_RGBA:
340 0 : extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
341 : num_rows);
342 0 : break;
343 : case JCS_EXT_BGR:
344 0 : extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
345 : num_rows);
346 0 : break;
347 : case JCS_EXT_BGRX:
348 : case JCS_EXT_BGRA:
349 0 : extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
350 : num_rows);
351 0 : break;
352 : case JCS_EXT_XBGR:
353 : case JCS_EXT_ABGR:
354 0 : extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
355 : num_rows);
356 0 : break;
357 : case JCS_EXT_XRGB:
358 : case JCS_EXT_ARGB:
359 0 : extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
360 : num_rows);
361 0 : break;
362 : default:
363 0 : rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
364 : num_rows);
365 0 : break;
366 : }
367 0 : }
368 :
369 :
370 : /*
371 : * Convert some rows of samples to the JPEG colorspace.
372 : * This version handles Adobe-style CMYK->YCCK conversion,
373 : * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
374 : * conversion as above, while passing K (black) unchanged.
375 : * We assume rgb_ycc_start has been called.
376 : */
377 :
378 : METHODDEF(void)
379 0 : cmyk_ycck_convert (j_compress_ptr cinfo,
380 : JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
381 : JDIMENSION output_row, int num_rows)
382 : {
383 0 : my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
384 : register int r, g, b;
385 0 : register JLONG *ctab = cconvert->rgb_ycc_tab;
386 : register JSAMPROW inptr;
387 : register JSAMPROW outptr0, outptr1, outptr2, outptr3;
388 : register JDIMENSION col;
389 0 : JDIMENSION num_cols = cinfo->image_width;
390 :
391 0 : while (--num_rows >= 0) {
392 0 : inptr = *input_buf++;
393 0 : outptr0 = output_buf[0][output_row];
394 0 : outptr1 = output_buf[1][output_row];
395 0 : outptr2 = output_buf[2][output_row];
396 0 : outptr3 = output_buf[3][output_row];
397 0 : output_row++;
398 0 : for (col = 0; col < num_cols; col++) {
399 0 : r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
400 0 : g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
401 0 : b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
402 : /* K passes through as-is */
403 0 : outptr3[col] = inptr[3]; /* don't need GETJSAMPLE here */
404 0 : inptr += 4;
405 : /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
406 : * must be too; we do not need an explicit range-limiting operation.
407 : * Hence the value being shifted is never negative, and we don't
408 : * need the general RIGHT_SHIFT macro.
409 : */
410 : /* Y */
411 0 : outptr0[col] = (JSAMPLE)
412 0 : ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
413 0 : >> SCALEBITS);
414 : /* Cb */
415 0 : outptr1[col] = (JSAMPLE)
416 0 : ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
417 0 : >> SCALEBITS);
418 : /* Cr */
419 0 : outptr2[col] = (JSAMPLE)
420 0 : ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
421 0 : >> SCALEBITS);
422 : }
423 : }
424 0 : }
425 :
426 :
427 : /*
428 : * Convert some rows of samples to the JPEG colorspace.
429 : * This version handles grayscale output with no conversion.
430 : * The source can be either plain grayscale or YCbCr (since Y == gray).
431 : */
432 :
433 : METHODDEF(void)
434 0 : grayscale_convert (j_compress_ptr cinfo,
435 : JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
436 : JDIMENSION output_row, int num_rows)
437 : {
438 : register JSAMPROW inptr;
439 : register JSAMPROW outptr;
440 : register JDIMENSION col;
441 0 : JDIMENSION num_cols = cinfo->image_width;
442 0 : int instride = cinfo->input_components;
443 :
444 0 : while (--num_rows >= 0) {
445 0 : inptr = *input_buf++;
446 0 : outptr = output_buf[0][output_row];
447 0 : output_row++;
448 0 : for (col = 0; col < num_cols; col++) {
449 0 : outptr[col] = inptr[0]; /* don't need GETJSAMPLE() here */
450 0 : inptr += instride;
451 : }
452 : }
453 0 : }
454 :
455 :
456 : /*
457 : * Convert some rows of samples to the JPEG colorspace.
458 : * This version handles multi-component colorspaces without conversion.
459 : * We assume input_components == num_components.
460 : */
461 :
462 : METHODDEF(void)
463 0 : null_convert (j_compress_ptr cinfo,
464 : JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
465 : JDIMENSION output_row, int num_rows)
466 : {
467 : register JSAMPROW inptr;
468 : register JSAMPROW outptr, outptr0, outptr1, outptr2, outptr3;
469 : register JDIMENSION col;
470 : register int ci;
471 0 : int nc = cinfo->num_components;
472 0 : JDIMENSION num_cols = cinfo->image_width;
473 :
474 0 : if (nc == 3) {
475 0 : while (--num_rows >= 0) {
476 0 : inptr = *input_buf++;
477 0 : outptr0 = output_buf[0][output_row];
478 0 : outptr1 = output_buf[1][output_row];
479 0 : outptr2 = output_buf[2][output_row];
480 0 : output_row++;
481 0 : for (col = 0; col < num_cols; col++) {
482 0 : outptr0[col] = *inptr++;
483 0 : outptr1[col] = *inptr++;
484 0 : outptr2[col] = *inptr++;
485 : }
486 : }
487 0 : } else if (nc == 4) {
488 0 : while (--num_rows >= 0) {
489 0 : inptr = *input_buf++;
490 0 : outptr0 = output_buf[0][output_row];
491 0 : outptr1 = output_buf[1][output_row];
492 0 : outptr2 = output_buf[2][output_row];
493 0 : outptr3 = output_buf[3][output_row];
494 0 : output_row++;
495 0 : for (col = 0; col < num_cols; col++) {
496 0 : outptr0[col] = *inptr++;
497 0 : outptr1[col] = *inptr++;
498 0 : outptr2[col] = *inptr++;
499 0 : outptr3[col] = *inptr++;
500 : }
501 : }
502 : } else {
503 0 : while (--num_rows >= 0) {
504 : /* It seems fastest to make a separate pass for each component. */
505 0 : for (ci = 0; ci < nc; ci++) {
506 0 : inptr = *input_buf;
507 0 : outptr = output_buf[ci][output_row];
508 0 : for (col = 0; col < num_cols; col++) {
509 0 : outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
510 0 : inptr += nc;
511 : }
512 : }
513 0 : input_buf++;
514 0 : output_row++;
515 : }
516 : }
517 0 : }
518 :
519 :
520 : /*
521 : * Empty method for start_pass.
522 : */
523 :
524 : METHODDEF(void)
525 0 : null_method (j_compress_ptr cinfo)
526 : {
527 : /* no work needed */
528 0 : }
529 :
530 :
531 : /*
532 : * Module initialization routine for input colorspace conversion.
533 : */
534 :
535 : GLOBAL(void)
536 0 : jinit_color_converter (j_compress_ptr cinfo)
537 : {
538 : my_cconvert_ptr cconvert;
539 :
540 0 : cconvert = (my_cconvert_ptr)
541 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
542 : sizeof(my_color_converter));
543 0 : cinfo->cconvert = (struct jpeg_color_converter *) cconvert;
544 : /* set start_pass to null method until we find out differently */
545 0 : cconvert->pub.start_pass = null_method;
546 :
547 : /* Make sure input_components agrees with in_color_space */
548 0 : switch (cinfo->in_color_space) {
549 : case JCS_GRAYSCALE:
550 0 : if (cinfo->input_components != 1)
551 0 : ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
552 0 : break;
553 :
554 : case JCS_RGB:
555 : case JCS_EXT_RGB:
556 : case JCS_EXT_RGBX:
557 : case JCS_EXT_BGR:
558 : case JCS_EXT_BGRX:
559 : case JCS_EXT_XBGR:
560 : case JCS_EXT_XRGB:
561 : case JCS_EXT_RGBA:
562 : case JCS_EXT_BGRA:
563 : case JCS_EXT_ABGR:
564 : case JCS_EXT_ARGB:
565 0 : if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
566 0 : ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
567 0 : break;
568 :
569 : case JCS_YCbCr:
570 0 : if (cinfo->input_components != 3)
571 0 : ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
572 0 : break;
573 :
574 : case JCS_CMYK:
575 : case JCS_YCCK:
576 0 : if (cinfo->input_components != 4)
577 0 : ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
578 0 : break;
579 :
580 : default: /* JCS_UNKNOWN can be anything */
581 0 : if (cinfo->input_components < 1)
582 0 : ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
583 0 : break;
584 : }
585 :
586 : /* Check num_components, set conversion method based on requested space */
587 0 : switch (cinfo->jpeg_color_space) {
588 : case JCS_GRAYSCALE:
589 0 : if (cinfo->num_components != 1)
590 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
591 0 : if (cinfo->in_color_space == JCS_GRAYSCALE)
592 0 : cconvert->pub.color_convert = grayscale_convert;
593 0 : else if (cinfo->in_color_space == JCS_RGB ||
594 0 : cinfo->in_color_space == JCS_EXT_RGB ||
595 0 : cinfo->in_color_space == JCS_EXT_RGBX ||
596 0 : cinfo->in_color_space == JCS_EXT_BGR ||
597 0 : cinfo->in_color_space == JCS_EXT_BGRX ||
598 0 : cinfo->in_color_space == JCS_EXT_XBGR ||
599 0 : cinfo->in_color_space == JCS_EXT_XRGB ||
600 0 : cinfo->in_color_space == JCS_EXT_RGBA ||
601 0 : cinfo->in_color_space == JCS_EXT_BGRA ||
602 0 : cinfo->in_color_space == JCS_EXT_ABGR ||
603 0 : cinfo->in_color_space == JCS_EXT_ARGB) {
604 0 : if (jsimd_can_rgb_gray())
605 0 : cconvert->pub.color_convert = jsimd_rgb_gray_convert;
606 : else {
607 0 : cconvert->pub.start_pass = rgb_ycc_start;
608 0 : cconvert->pub.color_convert = rgb_gray_convert;
609 : }
610 0 : } else if (cinfo->in_color_space == JCS_YCbCr)
611 0 : cconvert->pub.color_convert = grayscale_convert;
612 : else
613 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
614 0 : break;
615 :
616 : case JCS_RGB:
617 0 : if (cinfo->num_components != 3)
618 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
619 0 : if (rgb_red[cinfo->in_color_space] == 0 &&
620 0 : rgb_green[cinfo->in_color_space] == 1 &&
621 0 : rgb_blue[cinfo->in_color_space] == 2 &&
622 0 : rgb_pixelsize[cinfo->in_color_space] == 3) {
623 : #if defined(__mips__)
624 : if (jsimd_c_can_null_convert())
625 : cconvert->pub.color_convert = jsimd_c_null_convert;
626 : else
627 : #endif
628 0 : cconvert->pub.color_convert = null_convert;
629 0 : } else if (cinfo->in_color_space == JCS_RGB ||
630 0 : cinfo->in_color_space == JCS_EXT_RGB ||
631 0 : cinfo->in_color_space == JCS_EXT_RGBX ||
632 0 : cinfo->in_color_space == JCS_EXT_BGR ||
633 0 : cinfo->in_color_space == JCS_EXT_BGRX ||
634 0 : cinfo->in_color_space == JCS_EXT_XBGR ||
635 0 : cinfo->in_color_space == JCS_EXT_XRGB ||
636 0 : cinfo->in_color_space == JCS_EXT_RGBA ||
637 0 : cinfo->in_color_space == JCS_EXT_BGRA ||
638 0 : cinfo->in_color_space == JCS_EXT_ABGR ||
639 0 : cinfo->in_color_space == JCS_EXT_ARGB)
640 0 : cconvert->pub.color_convert = rgb_rgb_convert;
641 : else
642 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
643 0 : break;
644 :
645 : case JCS_YCbCr:
646 0 : if (cinfo->num_components != 3)
647 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
648 0 : if (cinfo->in_color_space == JCS_RGB ||
649 0 : cinfo->in_color_space == JCS_EXT_RGB ||
650 0 : cinfo->in_color_space == JCS_EXT_RGBX ||
651 0 : cinfo->in_color_space == JCS_EXT_BGR ||
652 0 : cinfo->in_color_space == JCS_EXT_BGRX ||
653 0 : cinfo->in_color_space == JCS_EXT_XBGR ||
654 0 : cinfo->in_color_space == JCS_EXT_XRGB ||
655 0 : cinfo->in_color_space == JCS_EXT_RGBA ||
656 0 : cinfo->in_color_space == JCS_EXT_BGRA ||
657 0 : cinfo->in_color_space == JCS_EXT_ABGR ||
658 0 : cinfo->in_color_space == JCS_EXT_ARGB) {
659 0 : if (jsimd_can_rgb_ycc())
660 0 : cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
661 : else {
662 0 : cconvert->pub.start_pass = rgb_ycc_start;
663 0 : cconvert->pub.color_convert = rgb_ycc_convert;
664 : }
665 0 : } else if (cinfo->in_color_space == JCS_YCbCr) {
666 : #if defined(__mips__)
667 : if (jsimd_c_can_null_convert())
668 : cconvert->pub.color_convert = jsimd_c_null_convert;
669 : else
670 : #endif
671 0 : cconvert->pub.color_convert = null_convert;
672 : } else
673 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
674 0 : break;
675 :
676 : case JCS_CMYK:
677 0 : if (cinfo->num_components != 4)
678 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
679 0 : if (cinfo->in_color_space == JCS_CMYK) {
680 : #if defined(__mips__)
681 : if (jsimd_c_can_null_convert())
682 : cconvert->pub.color_convert = jsimd_c_null_convert;
683 : else
684 : #endif
685 0 : cconvert->pub.color_convert = null_convert;
686 : } else
687 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
688 0 : break;
689 :
690 : case JCS_YCCK:
691 0 : if (cinfo->num_components != 4)
692 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
693 0 : if (cinfo->in_color_space == JCS_CMYK) {
694 0 : cconvert->pub.start_pass = rgb_ycc_start;
695 0 : cconvert->pub.color_convert = cmyk_ycck_convert;
696 0 : } else if (cinfo->in_color_space == JCS_YCCK) {
697 : #if defined(__mips__)
698 : if (jsimd_c_can_null_convert())
699 : cconvert->pub.color_convert = jsimd_c_null_convert;
700 : else
701 : #endif
702 0 : cconvert->pub.color_convert = null_convert;
703 : } else
704 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
705 0 : break;
706 :
707 : default: /* allow null conversion of JCS_UNKNOWN */
708 0 : if (cinfo->jpeg_color_space != cinfo->in_color_space ||
709 0 : cinfo->num_components != cinfo->input_components)
710 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
711 : #if defined(__mips__)
712 : if (jsimd_c_can_null_convert())
713 : cconvert->pub.color_convert = jsimd_c_null_convert;
714 : else
715 : #endif
716 0 : cconvert->pub.color_convert = null_convert;
717 0 : break;
718 : }
719 0 : }
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