Line data Source code
1 : /*
2 : * jdcolor.c
3 : *
4 : * This file was part of the Independent JPEG Group's software:
5 : * Copyright (C) 1991-1997, Thomas G. Lane.
6 : * Modified 2011 by Guido Vollbeding.
7 : * libjpeg-turbo Modifications:
8 : * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
9 : * Copyright (C) 2009, 2011-2012, 2014-2015, D. R. Commander.
10 : * Copyright (C) 2013, Linaro Limited.
11 : * For conditions of distribution and use, see the accompanying README.ijg
12 : * file.
13 : *
14 : * This file contains output colorspace conversion routines.
15 : */
16 :
17 : #define JPEG_INTERNALS
18 : #include "jinclude.h"
19 : #include "jpeglib.h"
20 : #include "jsimd.h"
21 : #include "jconfigint.h"
22 :
23 :
24 : /* Private subobject */
25 :
26 : typedef struct {
27 : struct jpeg_color_deconverter pub; /* public fields */
28 :
29 : /* Private state for YCC->RGB conversion */
30 : int *Cr_r_tab; /* => table for Cr to R conversion */
31 : int *Cb_b_tab; /* => table for Cb to B conversion */
32 : JLONG *Cr_g_tab; /* => table for Cr to G conversion */
33 : JLONG *Cb_g_tab; /* => table for Cb to G conversion */
34 :
35 : /* Private state for RGB->Y conversion */
36 : JLONG *rgb_y_tab; /* => table for RGB to Y conversion */
37 : } my_color_deconverter;
38 :
39 : typedef my_color_deconverter *my_cconvert_ptr;
40 :
41 :
42 : /**************** YCbCr -> RGB conversion: most common case **************/
43 : /**************** RGB -> Y conversion: less common case **************/
44 :
45 : /*
46 : * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
47 : * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
48 : * The conversion equations to be implemented are therefore
49 : *
50 : * R = Y + 1.40200 * Cr
51 : * G = Y - 0.34414 * Cb - 0.71414 * Cr
52 : * B = Y + 1.77200 * Cb
53 : *
54 : * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
55 : *
56 : * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
57 : * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
58 : *
59 : * To avoid floating-point arithmetic, we represent the fractional constants
60 : * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
61 : * the products by 2^16, with appropriate rounding, to get the correct answer.
62 : * Notice that Y, being an integral input, does not contribute any fraction
63 : * so it need not participate in the rounding.
64 : *
65 : * For even more speed, we avoid doing any multiplications in the inner loop
66 : * by precalculating the constants times Cb and Cr for all possible values.
67 : * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
68 : * for 12-bit samples it is still acceptable. It's not very reasonable for
69 : * 16-bit samples, but if you want lossless storage you shouldn't be changing
70 : * colorspace anyway.
71 : * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
72 : * values for the G calculation are left scaled up, since we must add them
73 : * together before rounding.
74 : */
75 :
76 : #define SCALEBITS 16 /* speediest right-shift on some machines */
77 : #define ONE_HALF ((JLONG) 1 << (SCALEBITS-1))
78 : #define FIX(x) ((JLONG) ((x) * (1L<<SCALEBITS) + 0.5))
79 :
80 : /* We allocate one big table for RGB->Y conversion and divide it up into
81 : * three parts, instead of doing three alloc_small requests. This lets us
82 : * use a single table base address, which can be held in a register in the
83 : * inner loops on many machines (more than can hold all three addresses,
84 : * anyway).
85 : */
86 :
87 : #define R_Y_OFF 0 /* offset to R => Y section */
88 : #define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */
89 : #define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */
90 : #define TABLE_SIZE (3*(MAXJSAMPLE+1))
91 :
92 :
93 : /* Include inline routines for colorspace extensions */
94 :
95 : #include "jdcolext.c"
96 : #undef RGB_RED
97 : #undef RGB_GREEN
98 : #undef RGB_BLUE
99 : #undef RGB_PIXELSIZE
100 :
101 : #define RGB_RED EXT_RGB_RED
102 : #define RGB_GREEN EXT_RGB_GREEN
103 : #define RGB_BLUE EXT_RGB_BLUE
104 : #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
105 : #define ycc_rgb_convert_internal ycc_extrgb_convert_internal
106 : #define gray_rgb_convert_internal gray_extrgb_convert_internal
107 : #define rgb_rgb_convert_internal rgb_extrgb_convert_internal
108 : #include "jdcolext.c"
109 : #undef RGB_RED
110 : #undef RGB_GREEN
111 : #undef RGB_BLUE
112 : #undef RGB_PIXELSIZE
113 : #undef ycc_rgb_convert_internal
114 : #undef gray_rgb_convert_internal
115 : #undef rgb_rgb_convert_internal
116 :
117 : #define RGB_RED EXT_RGBX_RED
118 : #define RGB_GREEN EXT_RGBX_GREEN
119 : #define RGB_BLUE EXT_RGBX_BLUE
120 : #define RGB_ALPHA 3
121 : #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
122 : #define ycc_rgb_convert_internal ycc_extrgbx_convert_internal
123 : #define gray_rgb_convert_internal gray_extrgbx_convert_internal
124 : #define rgb_rgb_convert_internal rgb_extrgbx_convert_internal
125 : #include "jdcolext.c"
126 : #undef RGB_RED
127 : #undef RGB_GREEN
128 : #undef RGB_BLUE
129 : #undef RGB_ALPHA
130 : #undef RGB_PIXELSIZE
131 : #undef ycc_rgb_convert_internal
132 : #undef gray_rgb_convert_internal
133 : #undef rgb_rgb_convert_internal
134 :
135 : #define RGB_RED EXT_BGR_RED
136 : #define RGB_GREEN EXT_BGR_GREEN
137 : #define RGB_BLUE EXT_BGR_BLUE
138 : #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
139 : #define ycc_rgb_convert_internal ycc_extbgr_convert_internal
140 : #define gray_rgb_convert_internal gray_extbgr_convert_internal
141 : #define rgb_rgb_convert_internal rgb_extbgr_convert_internal
142 : #include "jdcolext.c"
143 : #undef RGB_RED
144 : #undef RGB_GREEN
145 : #undef RGB_BLUE
146 : #undef RGB_PIXELSIZE
147 : #undef ycc_rgb_convert_internal
148 : #undef gray_rgb_convert_internal
149 : #undef rgb_rgb_convert_internal
150 :
151 : #define RGB_RED EXT_BGRX_RED
152 : #define RGB_GREEN EXT_BGRX_GREEN
153 : #define RGB_BLUE EXT_BGRX_BLUE
154 : #define RGB_ALPHA 3
155 : #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
156 : #define ycc_rgb_convert_internal ycc_extbgrx_convert_internal
157 : #define gray_rgb_convert_internal gray_extbgrx_convert_internal
158 : #define rgb_rgb_convert_internal rgb_extbgrx_convert_internal
159 : #include "jdcolext.c"
160 : #undef RGB_RED
161 : #undef RGB_GREEN
162 : #undef RGB_BLUE
163 : #undef RGB_ALPHA
164 : #undef RGB_PIXELSIZE
165 : #undef ycc_rgb_convert_internal
166 : #undef gray_rgb_convert_internal
167 : #undef rgb_rgb_convert_internal
168 :
169 : #define RGB_RED EXT_XBGR_RED
170 : #define RGB_GREEN EXT_XBGR_GREEN
171 : #define RGB_BLUE EXT_XBGR_BLUE
172 : #define RGB_ALPHA 0
173 : #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
174 : #define ycc_rgb_convert_internal ycc_extxbgr_convert_internal
175 : #define gray_rgb_convert_internal gray_extxbgr_convert_internal
176 : #define rgb_rgb_convert_internal rgb_extxbgr_convert_internal
177 : #include "jdcolext.c"
178 : #undef RGB_RED
179 : #undef RGB_GREEN
180 : #undef RGB_BLUE
181 : #undef RGB_ALPHA
182 : #undef RGB_PIXELSIZE
183 : #undef ycc_rgb_convert_internal
184 : #undef gray_rgb_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_ALPHA 0
191 : #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
192 : #define ycc_rgb_convert_internal ycc_extxrgb_convert_internal
193 : #define gray_rgb_convert_internal gray_extxrgb_convert_internal
194 : #define rgb_rgb_convert_internal rgb_extxrgb_convert_internal
195 : #include "jdcolext.c"
196 : #undef RGB_RED
197 : #undef RGB_GREEN
198 : #undef RGB_BLUE
199 : #undef RGB_ALPHA
200 : #undef RGB_PIXELSIZE
201 : #undef ycc_rgb_convert_internal
202 : #undef gray_rgb_convert_internal
203 : #undef rgb_rgb_convert_internal
204 :
205 :
206 : /*
207 : * Initialize tables for YCC->RGB colorspace conversion.
208 : */
209 :
210 : LOCAL(void)
211 0 : build_ycc_rgb_table (j_decompress_ptr cinfo)
212 : {
213 0 : my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
214 : int i;
215 : JLONG x;
216 : SHIFT_TEMPS
217 :
218 0 : cconvert->Cr_r_tab = (int *)
219 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
220 : (MAXJSAMPLE+1) * sizeof(int));
221 0 : cconvert->Cb_b_tab = (int *)
222 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
223 : (MAXJSAMPLE+1) * sizeof(int));
224 0 : cconvert->Cr_g_tab = (JLONG *)
225 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
226 : (MAXJSAMPLE+1) * sizeof(JLONG));
227 0 : cconvert->Cb_g_tab = (JLONG *)
228 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
229 : (MAXJSAMPLE+1) * sizeof(JLONG));
230 :
231 0 : for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
232 : /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
233 : /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
234 : /* Cr=>R value is nearest int to 1.40200 * x */
235 0 : cconvert->Cr_r_tab[i] = (int)
236 0 : RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
237 : /* Cb=>B value is nearest int to 1.77200 * x */
238 0 : cconvert->Cb_b_tab[i] = (int)
239 0 : RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
240 : /* Cr=>G value is scaled-up -0.71414 * x */
241 0 : cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
242 : /* Cb=>G value is scaled-up -0.34414 * x */
243 : /* We also add in ONE_HALF so that need not do it in inner loop */
244 0 : cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
245 : }
246 0 : }
247 :
248 :
249 : /*
250 : * Convert some rows of samples to the output colorspace.
251 : */
252 :
253 : METHODDEF(void)
254 0 : ycc_rgb_convert (j_decompress_ptr cinfo,
255 : JSAMPIMAGE input_buf, JDIMENSION input_row,
256 : JSAMPARRAY output_buf, int num_rows)
257 : {
258 0 : switch (cinfo->out_color_space) {
259 : case JCS_EXT_RGB:
260 0 : ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
261 : num_rows);
262 0 : break;
263 : case JCS_EXT_RGBX:
264 : case JCS_EXT_RGBA:
265 0 : ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
266 : num_rows);
267 0 : break;
268 : case JCS_EXT_BGR:
269 0 : ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
270 : num_rows);
271 0 : break;
272 : case JCS_EXT_BGRX:
273 : case JCS_EXT_BGRA:
274 0 : ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
275 : num_rows);
276 0 : break;
277 : case JCS_EXT_XBGR:
278 : case JCS_EXT_ABGR:
279 0 : ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
280 : num_rows);
281 0 : break;
282 : case JCS_EXT_XRGB:
283 : case JCS_EXT_ARGB:
284 0 : ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
285 : num_rows);
286 0 : break;
287 : default:
288 0 : ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
289 : num_rows);
290 0 : break;
291 : }
292 0 : }
293 :
294 :
295 : /**************** Cases other than YCbCr -> RGB **************/
296 :
297 :
298 : /*
299 : * Initialize for RGB->grayscale colorspace conversion.
300 : */
301 :
302 : LOCAL(void)
303 0 : build_rgb_y_table (j_decompress_ptr cinfo)
304 : {
305 0 : my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
306 : JLONG *rgb_y_tab;
307 : JLONG i;
308 :
309 : /* Allocate and fill in the conversion tables. */
310 0 : cconvert->rgb_y_tab = rgb_y_tab = (JLONG *)
311 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
312 : (TABLE_SIZE * sizeof(JLONG)));
313 :
314 0 : for (i = 0; i <= MAXJSAMPLE; i++) {
315 0 : rgb_y_tab[i+R_Y_OFF] = FIX(0.29900) * i;
316 0 : rgb_y_tab[i+G_Y_OFF] = FIX(0.58700) * i;
317 0 : rgb_y_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
318 : }
319 0 : }
320 :
321 :
322 : /*
323 : * Convert RGB to grayscale.
324 : */
325 :
326 : METHODDEF(void)
327 0 : rgb_gray_convert (j_decompress_ptr cinfo,
328 : JSAMPIMAGE input_buf, JDIMENSION input_row,
329 : JSAMPARRAY output_buf, int num_rows)
330 : {
331 0 : my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
332 : register int r, g, b;
333 0 : register JLONG *ctab = cconvert->rgb_y_tab;
334 : register JSAMPROW outptr;
335 : register JSAMPROW inptr0, inptr1, inptr2;
336 : register JDIMENSION col;
337 0 : JDIMENSION num_cols = cinfo->output_width;
338 :
339 0 : while (--num_rows >= 0) {
340 0 : inptr0 = input_buf[0][input_row];
341 0 : inptr1 = input_buf[1][input_row];
342 0 : inptr2 = input_buf[2][input_row];
343 0 : input_row++;
344 0 : outptr = *output_buf++;
345 0 : for (col = 0; col < num_cols; col++) {
346 0 : r = GETJSAMPLE(inptr0[col]);
347 0 : g = GETJSAMPLE(inptr1[col]);
348 0 : b = GETJSAMPLE(inptr2[col]);
349 : /* Y */
350 0 : outptr[col] = (JSAMPLE)
351 0 : ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
352 0 : >> SCALEBITS);
353 : }
354 : }
355 0 : }
356 :
357 :
358 : /*
359 : * Color conversion for no colorspace change: just copy the data,
360 : * converting from separate-planes to interleaved representation.
361 : */
362 :
363 : METHODDEF(void)
364 0 : null_convert (j_decompress_ptr cinfo,
365 : JSAMPIMAGE input_buf, JDIMENSION input_row,
366 : JSAMPARRAY output_buf, int num_rows)
367 : {
368 : register JSAMPROW inptr, inptr0, inptr1, inptr2, inptr3, outptr;
369 : register JDIMENSION col;
370 0 : register int num_components = cinfo->num_components;
371 0 : JDIMENSION num_cols = cinfo->output_width;
372 : int ci;
373 :
374 0 : if (num_components == 3) {
375 0 : while (--num_rows >= 0) {
376 0 : inptr0 = input_buf[0][input_row];
377 0 : inptr1 = input_buf[1][input_row];
378 0 : inptr2 = input_buf[2][input_row];
379 0 : input_row++;
380 0 : outptr = *output_buf++;
381 0 : for (col = 0; col < num_cols; col++) {
382 0 : *outptr++ = inptr0[col];
383 0 : *outptr++ = inptr1[col];
384 0 : *outptr++ = inptr2[col];
385 : }
386 : }
387 0 : } else if (num_components == 4) {
388 0 : while (--num_rows >= 0) {
389 0 : inptr0 = input_buf[0][input_row];
390 0 : inptr1 = input_buf[1][input_row];
391 0 : inptr2 = input_buf[2][input_row];
392 0 : inptr3 = input_buf[3][input_row];
393 0 : input_row++;
394 0 : outptr = *output_buf++;
395 0 : for (col = 0; col < num_cols; col++) {
396 0 : *outptr++ = inptr0[col];
397 0 : *outptr++ = inptr1[col];
398 0 : *outptr++ = inptr2[col];
399 0 : *outptr++ = inptr3[col];
400 : }
401 : }
402 : } else {
403 0 : while (--num_rows >= 0) {
404 0 : for (ci = 0; ci < num_components; ci++) {
405 0 : inptr = input_buf[ci][input_row];
406 0 : outptr = *output_buf;
407 0 : for (col = 0; col < num_cols; col++) {
408 0 : outptr[ci] = inptr[col];
409 0 : outptr += num_components;
410 : }
411 : }
412 0 : output_buf++;
413 0 : input_row++;
414 : }
415 : }
416 0 : }
417 :
418 :
419 : /*
420 : * Color conversion for grayscale: just copy the data.
421 : * This also works for YCbCr -> grayscale conversion, in which
422 : * we just copy the Y (luminance) component and ignore chrominance.
423 : */
424 :
425 : METHODDEF(void)
426 0 : grayscale_convert (j_decompress_ptr cinfo,
427 : JSAMPIMAGE input_buf, JDIMENSION input_row,
428 : JSAMPARRAY output_buf, int num_rows)
429 : {
430 0 : jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
431 : num_rows, cinfo->output_width);
432 0 : }
433 :
434 :
435 : /*
436 : * Convert grayscale to RGB
437 : */
438 :
439 : METHODDEF(void)
440 0 : gray_rgb_convert (j_decompress_ptr cinfo,
441 : JSAMPIMAGE input_buf, JDIMENSION input_row,
442 : JSAMPARRAY output_buf, int num_rows)
443 : {
444 0 : switch (cinfo->out_color_space) {
445 : case JCS_EXT_RGB:
446 0 : gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
447 : num_rows);
448 0 : break;
449 : case JCS_EXT_RGBX:
450 : case JCS_EXT_RGBA:
451 0 : gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
452 : num_rows);
453 0 : break;
454 : case JCS_EXT_BGR:
455 0 : gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
456 : num_rows);
457 0 : break;
458 : case JCS_EXT_BGRX:
459 : case JCS_EXT_BGRA:
460 0 : gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
461 : num_rows);
462 0 : break;
463 : case JCS_EXT_XBGR:
464 : case JCS_EXT_ABGR:
465 0 : gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
466 : num_rows);
467 0 : break;
468 : case JCS_EXT_XRGB:
469 : case JCS_EXT_ARGB:
470 0 : gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
471 : num_rows);
472 0 : break;
473 : default:
474 0 : gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
475 : num_rows);
476 0 : break;
477 : }
478 0 : }
479 :
480 :
481 : /*
482 : * Convert plain RGB to extended RGB
483 : */
484 :
485 : METHODDEF(void)
486 0 : rgb_rgb_convert (j_decompress_ptr cinfo,
487 : JSAMPIMAGE input_buf, JDIMENSION input_row,
488 : JSAMPARRAY output_buf, int num_rows)
489 : {
490 0 : switch (cinfo->out_color_space) {
491 : case JCS_EXT_RGB:
492 0 : rgb_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
493 : num_rows);
494 0 : break;
495 : case JCS_EXT_RGBX:
496 : case JCS_EXT_RGBA:
497 0 : rgb_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
498 : num_rows);
499 0 : break;
500 : case JCS_EXT_BGR:
501 0 : rgb_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
502 : num_rows);
503 0 : break;
504 : case JCS_EXT_BGRX:
505 : case JCS_EXT_BGRA:
506 0 : rgb_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
507 : num_rows);
508 0 : break;
509 : case JCS_EXT_XBGR:
510 : case JCS_EXT_ABGR:
511 0 : rgb_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
512 : num_rows);
513 0 : break;
514 : case JCS_EXT_XRGB:
515 : case JCS_EXT_ARGB:
516 0 : rgb_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
517 : num_rows);
518 0 : break;
519 : default:
520 0 : rgb_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
521 : num_rows);
522 0 : break;
523 : }
524 0 : }
525 :
526 :
527 : /*
528 : * Adobe-style YCCK->CMYK conversion.
529 : * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
530 : * conversion as above, while passing K (black) unchanged.
531 : * We assume build_ycc_rgb_table has been called.
532 : */
533 :
534 : METHODDEF(void)
535 0 : ycck_cmyk_convert (j_decompress_ptr cinfo,
536 : JSAMPIMAGE input_buf, JDIMENSION input_row,
537 : JSAMPARRAY output_buf, int num_rows)
538 : {
539 0 : my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
540 : register int y, cb, cr;
541 : register JSAMPROW outptr;
542 : register JSAMPROW inptr0, inptr1, inptr2, inptr3;
543 : register JDIMENSION col;
544 0 : JDIMENSION num_cols = cinfo->output_width;
545 : /* copy these pointers into registers if possible */
546 0 : register JSAMPLE *range_limit = cinfo->sample_range_limit;
547 0 : register int *Crrtab = cconvert->Cr_r_tab;
548 0 : register int *Cbbtab = cconvert->Cb_b_tab;
549 0 : register JLONG *Crgtab = cconvert->Cr_g_tab;
550 0 : register JLONG *Cbgtab = cconvert->Cb_g_tab;
551 : SHIFT_TEMPS
552 :
553 0 : while (--num_rows >= 0) {
554 0 : inptr0 = input_buf[0][input_row];
555 0 : inptr1 = input_buf[1][input_row];
556 0 : inptr2 = input_buf[2][input_row];
557 0 : inptr3 = input_buf[3][input_row];
558 0 : input_row++;
559 0 : outptr = *output_buf++;
560 0 : for (col = 0; col < num_cols; col++) {
561 0 : y = GETJSAMPLE(inptr0[col]);
562 0 : cb = GETJSAMPLE(inptr1[col]);
563 0 : cr = GETJSAMPLE(inptr2[col]);
564 : /* Range-limiting is essential due to noise introduced by DCT losses. */
565 0 : outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])]; /* red */
566 0 : outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */
567 0 : ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
568 : SCALEBITS)))];
569 0 : outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])]; /* blue */
570 : /* K passes through unchanged */
571 0 : outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */
572 0 : outptr += 4;
573 : }
574 : }
575 0 : }
576 :
577 :
578 : /*
579 : * RGB565 conversion
580 : */
581 :
582 : #define PACK_SHORT_565_LE(r, g, b) ((((r) << 8) & 0xF800) | \
583 : (((g) << 3) & 0x7E0) | ((b) >> 3))
584 : #define PACK_SHORT_565_BE(r, g, b) (((r) & 0xF8) | ((g) >> 5) | \
585 : (((g) << 11) & 0xE000) | \
586 : (((b) << 5) & 0x1F00))
587 :
588 : #define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
589 : #define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
590 :
591 : #define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3)
592 :
593 : #define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) ((*(int *)(addr)) = pixels)
594 :
595 : #define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
596 : #define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
597 : #define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
598 :
599 :
600 : /* Declarations for ordered dithering
601 : *
602 : * We use a 4x4 ordered dither array packed into 32 bits. This array is
603 : * sufficent for dithering RGB888 to RGB565.
604 : */
605 :
606 : #define DITHER_MASK 0x3
607 : #define DITHER_ROTATE(x) ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
608 : static const JLONG dither_matrix[4] = {
609 : 0x0008020A,
610 : 0x0C040E06,
611 : 0x030B0109,
612 : 0x0F070D05
613 : };
614 :
615 :
616 0 : static INLINE boolean is_big_endian(void)
617 : {
618 0 : int test_value = 1;
619 0 : if(*(char *)&test_value != 1)
620 0 : return TRUE;
621 0 : return FALSE;
622 : }
623 :
624 :
625 : /* Include inline routines for RGB565 conversion */
626 :
627 : #define PACK_SHORT_565 PACK_SHORT_565_LE
628 : #define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
629 : #define ycc_rgb565_convert_internal ycc_rgb565_convert_le
630 : #define ycc_rgb565D_convert_internal ycc_rgb565D_convert_le
631 : #define rgb_rgb565_convert_internal rgb_rgb565_convert_le
632 : #define rgb_rgb565D_convert_internal rgb_rgb565D_convert_le
633 : #define gray_rgb565_convert_internal gray_rgb565_convert_le
634 : #define gray_rgb565D_convert_internal gray_rgb565D_convert_le
635 : #include "jdcol565.c"
636 : #undef PACK_SHORT_565
637 : #undef PACK_TWO_PIXELS
638 : #undef ycc_rgb565_convert_internal
639 : #undef ycc_rgb565D_convert_internal
640 : #undef rgb_rgb565_convert_internal
641 : #undef rgb_rgb565D_convert_internal
642 : #undef gray_rgb565_convert_internal
643 : #undef gray_rgb565D_convert_internal
644 :
645 : #define PACK_SHORT_565 PACK_SHORT_565_BE
646 : #define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
647 : #define ycc_rgb565_convert_internal ycc_rgb565_convert_be
648 : #define ycc_rgb565D_convert_internal ycc_rgb565D_convert_be
649 : #define rgb_rgb565_convert_internal rgb_rgb565_convert_be
650 : #define rgb_rgb565D_convert_internal rgb_rgb565D_convert_be
651 : #define gray_rgb565_convert_internal gray_rgb565_convert_be
652 : #define gray_rgb565D_convert_internal gray_rgb565D_convert_be
653 : #include "jdcol565.c"
654 : #undef PACK_SHORT_565
655 : #undef PACK_TWO_PIXELS
656 : #undef ycc_rgb565_convert_internal
657 : #undef ycc_rgb565D_convert_internal
658 : #undef rgb_rgb565_convert_internal
659 : #undef rgb_rgb565D_convert_internal
660 : #undef gray_rgb565_convert_internal
661 : #undef gray_rgb565D_convert_internal
662 :
663 :
664 : METHODDEF(void)
665 0 : ycc_rgb565_convert (j_decompress_ptr cinfo,
666 : JSAMPIMAGE input_buf, JDIMENSION input_row,
667 : JSAMPARRAY output_buf, int num_rows)
668 : {
669 0 : if (is_big_endian())
670 0 : ycc_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
671 : else
672 0 : ycc_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
673 0 : }
674 :
675 :
676 : METHODDEF(void)
677 0 : ycc_rgb565D_convert (j_decompress_ptr cinfo,
678 : JSAMPIMAGE input_buf, JDIMENSION input_row,
679 : JSAMPARRAY output_buf, int num_rows)
680 : {
681 0 : if (is_big_endian())
682 0 : ycc_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
683 : else
684 0 : ycc_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
685 0 : }
686 :
687 :
688 : METHODDEF(void)
689 0 : rgb_rgb565_convert (j_decompress_ptr cinfo,
690 : JSAMPIMAGE input_buf, JDIMENSION input_row,
691 : JSAMPARRAY output_buf, int num_rows)
692 : {
693 0 : if (is_big_endian())
694 0 : rgb_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
695 : else
696 0 : rgb_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
697 0 : }
698 :
699 :
700 : METHODDEF(void)
701 0 : rgb_rgb565D_convert (j_decompress_ptr cinfo,
702 : JSAMPIMAGE input_buf, JDIMENSION input_row,
703 : JSAMPARRAY output_buf, int num_rows)
704 : {
705 0 : if (is_big_endian())
706 0 : rgb_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
707 : else
708 0 : rgb_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
709 0 : }
710 :
711 :
712 : METHODDEF(void)
713 0 : gray_rgb565_convert (j_decompress_ptr cinfo,
714 : JSAMPIMAGE input_buf, JDIMENSION input_row,
715 : JSAMPARRAY output_buf, int num_rows)
716 : {
717 0 : if (is_big_endian())
718 0 : gray_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
719 : else
720 0 : gray_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
721 0 : }
722 :
723 :
724 : METHODDEF(void)
725 0 : gray_rgb565D_convert (j_decompress_ptr cinfo,
726 : JSAMPIMAGE input_buf, JDIMENSION input_row,
727 : JSAMPARRAY output_buf, int num_rows)
728 : {
729 0 : if (is_big_endian())
730 0 : gray_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows);
731 : else
732 0 : gray_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows);
733 0 : }
734 :
735 :
736 : /*
737 : * Empty method for start_pass.
738 : */
739 :
740 : METHODDEF(void)
741 0 : start_pass_dcolor (j_decompress_ptr cinfo)
742 : {
743 : /* no work needed */
744 0 : }
745 :
746 :
747 : /*
748 : * Module initialization routine for output colorspace conversion.
749 : */
750 :
751 : GLOBAL(void)
752 0 : jinit_color_deconverter (j_decompress_ptr cinfo)
753 : {
754 : my_cconvert_ptr cconvert;
755 : int ci;
756 :
757 0 : cconvert = (my_cconvert_ptr)
758 0 : (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
759 : sizeof(my_color_deconverter));
760 0 : cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
761 0 : cconvert->pub.start_pass = start_pass_dcolor;
762 :
763 : /* Make sure num_components agrees with jpeg_color_space */
764 0 : switch (cinfo->jpeg_color_space) {
765 : case JCS_GRAYSCALE:
766 0 : if (cinfo->num_components != 1)
767 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
768 0 : break;
769 :
770 : case JCS_RGB:
771 : case JCS_YCbCr:
772 0 : if (cinfo->num_components != 3)
773 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
774 0 : break;
775 :
776 : case JCS_CMYK:
777 : case JCS_YCCK:
778 0 : if (cinfo->num_components != 4)
779 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
780 0 : break;
781 :
782 : default: /* JCS_UNKNOWN can be anything */
783 0 : if (cinfo->num_components < 1)
784 0 : ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
785 0 : break;
786 : }
787 :
788 : /* Set out_color_components and conversion method based on requested space.
789 : * Also clear the component_needed flags for any unused components,
790 : * so that earlier pipeline stages can avoid useless computation.
791 : */
792 :
793 0 : switch (cinfo->out_color_space) {
794 : case JCS_GRAYSCALE:
795 0 : cinfo->out_color_components = 1;
796 0 : if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
797 0 : cinfo->jpeg_color_space == JCS_YCbCr) {
798 0 : cconvert->pub.color_convert = grayscale_convert;
799 : /* For color->grayscale conversion, only the Y (0) component is needed */
800 0 : for (ci = 1; ci < cinfo->num_components; ci++)
801 0 : cinfo->comp_info[ci].component_needed = FALSE;
802 0 : } else if (cinfo->jpeg_color_space == JCS_RGB) {
803 0 : cconvert->pub.color_convert = rgb_gray_convert;
804 0 : build_rgb_y_table(cinfo);
805 : } else
806 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
807 0 : break;
808 :
809 : case JCS_RGB:
810 : case JCS_EXT_RGB:
811 : case JCS_EXT_RGBX:
812 : case JCS_EXT_BGR:
813 : case JCS_EXT_BGRX:
814 : case JCS_EXT_XBGR:
815 : case JCS_EXT_XRGB:
816 : case JCS_EXT_RGBA:
817 : case JCS_EXT_BGRA:
818 : case JCS_EXT_ABGR:
819 : case JCS_EXT_ARGB:
820 0 : cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
821 0 : if (cinfo->jpeg_color_space == JCS_YCbCr) {
822 0 : if (jsimd_can_ycc_rgb())
823 0 : cconvert->pub.color_convert = jsimd_ycc_rgb_convert;
824 : else {
825 0 : cconvert->pub.color_convert = ycc_rgb_convert;
826 0 : build_ycc_rgb_table(cinfo);
827 : }
828 0 : } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
829 0 : cconvert->pub.color_convert = gray_rgb_convert;
830 0 : } else if (cinfo->jpeg_color_space == JCS_RGB) {
831 0 : if (rgb_red[cinfo->out_color_space] == 0 &&
832 0 : rgb_green[cinfo->out_color_space] == 1 &&
833 0 : rgb_blue[cinfo->out_color_space] == 2 &&
834 0 : rgb_pixelsize[cinfo->out_color_space] == 3)
835 0 : cconvert->pub.color_convert = null_convert;
836 : else
837 0 : cconvert->pub.color_convert = rgb_rgb_convert;
838 : } else
839 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
840 0 : break;
841 :
842 : case JCS_RGB565:
843 0 : cinfo->out_color_components = 3;
844 0 : if (cinfo->dither_mode == JDITHER_NONE) {
845 0 : if (cinfo->jpeg_color_space == JCS_YCbCr) {
846 0 : if (jsimd_can_ycc_rgb565())
847 0 : cconvert->pub.color_convert = jsimd_ycc_rgb565_convert;
848 : else {
849 0 : cconvert->pub.color_convert = ycc_rgb565_convert;
850 0 : build_ycc_rgb_table(cinfo);
851 : }
852 0 : } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
853 0 : cconvert->pub.color_convert = gray_rgb565_convert;
854 0 : } else if (cinfo->jpeg_color_space == JCS_RGB) {
855 0 : cconvert->pub.color_convert = rgb_rgb565_convert;
856 : } else
857 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
858 : } else {
859 : /* only ordered dithering is supported */
860 0 : if (cinfo->jpeg_color_space == JCS_YCbCr) {
861 0 : cconvert->pub.color_convert = ycc_rgb565D_convert;
862 0 : build_ycc_rgb_table(cinfo);
863 0 : } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
864 0 : cconvert->pub.color_convert = gray_rgb565D_convert;
865 0 : } else if (cinfo->jpeg_color_space == JCS_RGB) {
866 0 : cconvert->pub.color_convert = rgb_rgb565D_convert;
867 : } else
868 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
869 : }
870 0 : break;
871 :
872 : case JCS_CMYK:
873 0 : cinfo->out_color_components = 4;
874 0 : if (cinfo->jpeg_color_space == JCS_YCCK) {
875 0 : cconvert->pub.color_convert = ycck_cmyk_convert;
876 0 : build_ycc_rgb_table(cinfo);
877 0 : } else if (cinfo->jpeg_color_space == JCS_CMYK) {
878 0 : cconvert->pub.color_convert = null_convert;
879 : } else
880 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
881 0 : break;
882 :
883 : default:
884 : /* Permit null conversion to same output space */
885 0 : if (cinfo->out_color_space == cinfo->jpeg_color_space) {
886 0 : cinfo->out_color_components = cinfo->num_components;
887 0 : cconvert->pub.color_convert = null_convert;
888 : } else /* unsupported non-null conversion */
889 0 : ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
890 0 : break;
891 : }
892 :
893 0 : if (cinfo->quantize_colors)
894 0 : cinfo->output_components = 1; /* single colormapped output component */
895 : else
896 0 : cinfo->output_components = cinfo->out_color_components;
897 0 : }
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