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author | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
---|---|---|
committer | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
commit | 393b5cd1dc438872af89d334ef6e5fcc59f27d47 (patch) | |
tree | 6a14521219942a08a1b95cb2f5a923a9edd60f63 /libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdcolor.c | |
parent | Add a note about rasters suggested start up code. (diff) | |
download | SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.zip SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.gz SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.bz2 SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.xz |
Added Irrlicht 1.8, but without all the Windows binaries.
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdcolor.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdcolor.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdcolor.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdcolor.c new file mode 100644 index 0000000..c12d9c8 --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdcolor.c | |||
@@ -0,0 +1,512 @@ | |||
1 | /* | ||
2 | * jdcolor.c | ||
3 | * | ||
4 | * Copyright (C) 1991-1997, Thomas G. Lane. | ||
5 | * Modified 2011 by Guido Vollbeding. | ||
6 | * This file is part of the Independent JPEG Group's software. | ||
7 | * For conditions of distribution and use, see the accompanying README file. | ||
8 | * | ||
9 | * This file contains output colorspace conversion routines. | ||
10 | */ | ||
11 | |||
12 | #define JPEG_INTERNALS | ||
13 | #include "jinclude.h" | ||
14 | #include "jpeglib.h" | ||
15 | |||
16 | |||
17 | /* Private subobject */ | ||
18 | |||
19 | typedef struct { | ||
20 | struct jpeg_color_deconverter pub; /* public fields */ | ||
21 | |||
22 | /* Private state for YCC->RGB conversion */ | ||
23 | int * Cr_r_tab; /* => table for Cr to R conversion */ | ||
24 | int * Cb_b_tab; /* => table for Cb to B conversion */ | ||
25 | INT32 * Cr_g_tab; /* => table for Cr to G conversion */ | ||
26 | INT32 * Cb_g_tab; /* => table for Cb to G conversion */ | ||
27 | |||
28 | /* Private state for RGB->Y conversion */ | ||
29 | INT32 * rgb_y_tab; /* => table for RGB to Y conversion */ | ||
30 | } my_color_deconverter; | ||
31 | |||
32 | typedef my_color_deconverter * my_cconvert_ptr; | ||
33 | |||
34 | |||
35 | /**************** YCbCr -> RGB conversion: most common case **************/ | ||
36 | /**************** RGB -> Y conversion: less common case **************/ | ||
37 | |||
38 | /* | ||
39 | * YCbCr is defined per CCIR 601-1, except that Cb and Cr are | ||
40 | * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. | ||
41 | * The conversion equations to be implemented are therefore | ||
42 | * | ||
43 | * R = Y + 1.40200 * Cr | ||
44 | * G = Y - 0.34414 * Cb - 0.71414 * Cr | ||
45 | * B = Y + 1.77200 * Cb | ||
46 | * | ||
47 | * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B | ||
48 | * | ||
49 | * where Cb and Cr represent the incoming values less CENTERJSAMPLE. | ||
50 | * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.) | ||
51 | * | ||
52 | * To avoid floating-point arithmetic, we represent the fractional constants | ||
53 | * as integers scaled up by 2^16 (about 4 digits precision); we have to divide | ||
54 | * the products by 2^16, with appropriate rounding, to get the correct answer. | ||
55 | * Notice that Y, being an integral input, does not contribute any fraction | ||
56 | * so it need not participate in the rounding. | ||
57 | * | ||
58 | * For even more speed, we avoid doing any multiplications in the inner loop | ||
59 | * by precalculating the constants times Cb and Cr for all possible values. | ||
60 | * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table); | ||
61 | * for 12-bit samples it is still acceptable. It's not very reasonable for | ||
62 | * 16-bit samples, but if you want lossless storage you shouldn't be changing | ||
63 | * colorspace anyway. | ||
64 | * The Cr=>R and Cb=>B values can be rounded to integers in advance; the | ||
65 | * values for the G calculation are left scaled up, since we must add them | ||
66 | * together before rounding. | ||
67 | */ | ||
68 | |||
69 | #define SCALEBITS 16 /* speediest right-shift on some machines */ | ||
70 | #define ONE_HALF ((INT32) 1 << (SCALEBITS-1)) | ||
71 | #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5)) | ||
72 | |||
73 | /* We allocate one big table for RGB->Y conversion and divide it up into | ||
74 | * three parts, instead of doing three alloc_small requests. This lets us | ||
75 | * use a single table base address, which can be held in a register in the | ||
76 | * inner loops on many machines (more than can hold all three addresses, | ||
77 | * anyway). | ||
78 | */ | ||
79 | |||
80 | #define R_Y_OFF 0 /* offset to R => Y section */ | ||
81 | #define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */ | ||
82 | #define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */ | ||
83 | #define TABLE_SIZE (3*(MAXJSAMPLE+1)) | ||
84 | |||
85 | |||
86 | /* | ||
87 | * Initialize tables for YCC->RGB colorspace conversion. | ||
88 | */ | ||
89 | |||
90 | LOCAL(void) | ||
91 | build_ycc_rgb_table (j_decompress_ptr cinfo) | ||
92 | { | ||
93 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | ||
94 | int i; | ||
95 | INT32 x; | ||
96 | SHIFT_TEMPS | ||
97 | |||
98 | cconvert->Cr_r_tab = (int *) | ||
99 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
100 | (MAXJSAMPLE+1) * SIZEOF(int)); | ||
101 | cconvert->Cb_b_tab = (int *) | ||
102 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
103 | (MAXJSAMPLE+1) * SIZEOF(int)); | ||
104 | cconvert->Cr_g_tab = (INT32 *) | ||
105 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
106 | (MAXJSAMPLE+1) * SIZEOF(INT32)); | ||
107 | cconvert->Cb_g_tab = (INT32 *) | ||
108 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
109 | (MAXJSAMPLE+1) * SIZEOF(INT32)); | ||
110 | |||
111 | for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { | ||
112 | /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ | ||
113 | /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ | ||
114 | /* Cr=>R value is nearest int to 1.40200 * x */ | ||
115 | cconvert->Cr_r_tab[i] = (int) | ||
116 | RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS); | ||
117 | /* Cb=>B value is nearest int to 1.77200 * x */ | ||
118 | cconvert->Cb_b_tab[i] = (int) | ||
119 | RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS); | ||
120 | /* Cr=>G value is scaled-up -0.71414 * x */ | ||
121 | cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x; | ||
122 | /* Cb=>G value is scaled-up -0.34414 * x */ | ||
123 | /* We also add in ONE_HALF so that need not do it in inner loop */ | ||
124 | cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF; | ||
125 | } | ||
126 | } | ||
127 | |||
128 | |||
129 | /* | ||
130 | * Convert some rows of samples to the output colorspace. | ||
131 | * | ||
132 | * Note that we change from noninterleaved, one-plane-per-component format | ||
133 | * to interleaved-pixel format. The output buffer is therefore three times | ||
134 | * as wide as the input buffer. | ||
135 | * A starting row offset is provided only for the input buffer. The caller | ||
136 | * can easily adjust the passed output_buf value to accommodate any row | ||
137 | * offset required on that side. | ||
138 | */ | ||
139 | |||
140 | METHODDEF(void) | ||
141 | ycc_rgb_convert (j_decompress_ptr cinfo, | ||
142 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
143 | JSAMPARRAY output_buf, int num_rows) | ||
144 | { | ||
145 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | ||
146 | register int y, cb, cr; | ||
147 | register JSAMPROW outptr; | ||
148 | register JSAMPROW inptr0, inptr1, inptr2; | ||
149 | register JDIMENSION col; | ||
150 | JDIMENSION num_cols = cinfo->output_width; | ||
151 | /* copy these pointers into registers if possible */ | ||
152 | register JSAMPLE * range_limit = cinfo->sample_range_limit; | ||
153 | register int * Crrtab = cconvert->Cr_r_tab; | ||
154 | register int * Cbbtab = cconvert->Cb_b_tab; | ||
155 | register INT32 * Crgtab = cconvert->Cr_g_tab; | ||
156 | register INT32 * Cbgtab = cconvert->Cb_g_tab; | ||
157 | SHIFT_TEMPS | ||
158 | |||
159 | while (--num_rows >= 0) { | ||
160 | inptr0 = input_buf[0][input_row]; | ||
161 | inptr1 = input_buf[1][input_row]; | ||
162 | inptr2 = input_buf[2][input_row]; | ||
163 | input_row++; | ||
164 | outptr = *output_buf++; | ||
165 | for (col = 0; col < num_cols; col++) { | ||
166 | y = GETJSAMPLE(inptr0[col]); | ||
167 | cb = GETJSAMPLE(inptr1[col]); | ||
168 | cr = GETJSAMPLE(inptr2[col]); | ||
169 | /* Range-limiting is essential due to noise introduced by DCT losses. */ | ||
170 | outptr[RGB_RED] = range_limit[y + Crrtab[cr]]; | ||
171 | outptr[RGB_GREEN] = range_limit[y + | ||
172 | ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], | ||
173 | SCALEBITS))]; | ||
174 | outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]]; | ||
175 | outptr += RGB_PIXELSIZE; | ||
176 | } | ||
177 | } | ||
178 | } | ||
179 | |||
180 | |||
181 | /**************** Cases other than YCbCr -> RGB **************/ | ||
182 | |||
183 | |||
184 | /* | ||
185 | * Initialize for RGB->grayscale colorspace conversion. | ||
186 | */ | ||
187 | |||
188 | LOCAL(void) | ||
189 | build_rgb_y_table (j_decompress_ptr cinfo) | ||
190 | { | ||
191 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | ||
192 | INT32 * rgb_y_tab; | ||
193 | INT32 i; | ||
194 | |||
195 | /* Allocate and fill in the conversion tables. */ | ||
196 | cconvert->rgb_y_tab = rgb_y_tab = (INT32 *) | ||
197 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
198 | (TABLE_SIZE * SIZEOF(INT32))); | ||
199 | |||
200 | for (i = 0; i <= MAXJSAMPLE; i++) { | ||
201 | rgb_y_tab[i+R_Y_OFF] = FIX(0.29900) * i; | ||
202 | rgb_y_tab[i+G_Y_OFF] = FIX(0.58700) * i; | ||
203 | rgb_y_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF; | ||
204 | } | ||
205 | } | ||
206 | |||
207 | |||
208 | /* | ||
209 | * Convert RGB to grayscale. | ||
210 | */ | ||
211 | |||
212 | METHODDEF(void) | ||
213 | rgb_gray_convert (j_decompress_ptr cinfo, | ||
214 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
215 | JSAMPARRAY output_buf, int num_rows) | ||
216 | { | ||
217 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | ||
218 | register int r, g, b; | ||
219 | register INT32 * ctab = cconvert->rgb_y_tab; | ||
220 | register JSAMPROW outptr; | ||
221 | register JSAMPROW inptr0, inptr1, inptr2; | ||
222 | register JDIMENSION col; | ||
223 | JDIMENSION num_cols = cinfo->output_width; | ||
224 | |||
225 | while (--num_rows >= 0) { | ||
226 | inptr0 = input_buf[0][input_row]; | ||
227 | inptr1 = input_buf[1][input_row]; | ||
228 | inptr2 = input_buf[2][input_row]; | ||
229 | input_row++; | ||
230 | outptr = *output_buf++; | ||
231 | for (col = 0; col < num_cols; col++) { | ||
232 | r = GETJSAMPLE(inptr0[col]); | ||
233 | g = GETJSAMPLE(inptr1[col]); | ||
234 | b = GETJSAMPLE(inptr2[col]); | ||
235 | /* Y */ | ||
236 | outptr[col] = (JSAMPLE) | ||
237 | ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) | ||
238 | >> SCALEBITS); | ||
239 | } | ||
240 | } | ||
241 | } | ||
242 | |||
243 | |||
244 | /* | ||
245 | * No colorspace change, but conversion from separate-planes | ||
246 | * to interleaved representation. | ||
247 | */ | ||
248 | |||
249 | METHODDEF(void) | ||
250 | rgb_convert (j_decompress_ptr cinfo, | ||
251 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
252 | JSAMPARRAY output_buf, int num_rows) | ||
253 | { | ||
254 | register JSAMPROW outptr; | ||
255 | register JSAMPROW inptr0, inptr1, inptr2; | ||
256 | register JDIMENSION col; | ||
257 | JDIMENSION num_cols = cinfo->output_width; | ||
258 | |||
259 | while (--num_rows >= 0) { | ||
260 | inptr0 = input_buf[0][input_row]; | ||
261 | inptr1 = input_buf[1][input_row]; | ||
262 | inptr2 = input_buf[2][input_row]; | ||
263 | input_row++; | ||
264 | outptr = *output_buf++; | ||
265 | for (col = 0; col < num_cols; col++) { | ||
266 | /* We can dispense with GETJSAMPLE() here */ | ||
267 | outptr[RGB_RED] = inptr0[col]; | ||
268 | outptr[RGB_GREEN] = inptr1[col]; | ||
269 | outptr[RGB_BLUE] = inptr2[col]; | ||
270 | outptr += RGB_PIXELSIZE; | ||
271 | } | ||
272 | } | ||
273 | } | ||
274 | |||
275 | |||
276 | /* | ||
277 | * Color conversion for no colorspace change: just copy the data, | ||
278 | * converting from separate-planes to interleaved representation. | ||
279 | */ | ||
280 | |||
281 | METHODDEF(void) | ||
282 | null_convert (j_decompress_ptr cinfo, | ||
283 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
284 | JSAMPARRAY output_buf, int num_rows) | ||
285 | { | ||
286 | register JSAMPROW inptr, outptr; | ||
287 | register JDIMENSION count; | ||
288 | register int num_components = cinfo->num_components; | ||
289 | JDIMENSION num_cols = cinfo->output_width; | ||
290 | int ci; | ||
291 | |||
292 | while (--num_rows >= 0) { | ||
293 | for (ci = 0; ci < num_components; ci++) { | ||
294 | inptr = input_buf[ci][input_row]; | ||
295 | outptr = output_buf[0] + ci; | ||
296 | for (count = num_cols; count > 0; count--) { | ||
297 | *outptr = *inptr++; /* needn't bother with GETJSAMPLE() here */ | ||
298 | outptr += num_components; | ||
299 | } | ||
300 | } | ||
301 | input_row++; | ||
302 | output_buf++; | ||
303 | } | ||
304 | } | ||
305 | |||
306 | |||
307 | /* | ||
308 | * Color conversion for grayscale: just copy the data. | ||
309 | * This also works for YCbCr -> grayscale conversion, in which | ||
310 | * we just copy the Y (luminance) component and ignore chrominance. | ||
311 | */ | ||
312 | |||
313 | METHODDEF(void) | ||
314 | grayscale_convert (j_decompress_ptr cinfo, | ||
315 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
316 | JSAMPARRAY output_buf, int num_rows) | ||
317 | { | ||
318 | jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0, | ||
319 | num_rows, cinfo->output_width); | ||
320 | } | ||
321 | |||
322 | |||
323 | /* | ||
324 | * Convert grayscale to RGB: just duplicate the graylevel three times. | ||
325 | * This is provided to support applications that don't want to cope | ||
326 | * with grayscale as a separate case. | ||
327 | */ | ||
328 | |||
329 | METHODDEF(void) | ||
330 | gray_rgb_convert (j_decompress_ptr cinfo, | ||
331 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
332 | JSAMPARRAY output_buf, int num_rows) | ||
333 | { | ||
334 | register JSAMPROW inptr, outptr; | ||
335 | register JDIMENSION col; | ||
336 | JDIMENSION num_cols = cinfo->output_width; | ||
337 | |||
338 | while (--num_rows >= 0) { | ||
339 | inptr = input_buf[0][input_row++]; | ||
340 | outptr = *output_buf++; | ||
341 | for (col = 0; col < num_cols; col++) { | ||
342 | /* We can dispense with GETJSAMPLE() here */ | ||
343 | outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col]; | ||
344 | outptr += RGB_PIXELSIZE; | ||
345 | } | ||
346 | } | ||
347 | } | ||
348 | |||
349 | |||
350 | /* | ||
351 | * Adobe-style YCCK->CMYK conversion. | ||
352 | * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same | ||
353 | * conversion as above, while passing K (black) unchanged. | ||
354 | * We assume build_ycc_rgb_table has been called. | ||
355 | */ | ||
356 | |||
357 | METHODDEF(void) | ||
358 | ycck_cmyk_convert (j_decompress_ptr cinfo, | ||
359 | JSAMPIMAGE input_buf, JDIMENSION input_row, | ||
360 | JSAMPARRAY output_buf, int num_rows) | ||
361 | { | ||
362 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; | ||
363 | register int y, cb, cr; | ||
364 | register JSAMPROW outptr; | ||
365 | register JSAMPROW inptr0, inptr1, inptr2, inptr3; | ||
366 | register JDIMENSION col; | ||
367 | JDIMENSION num_cols = cinfo->output_width; | ||
368 | /* copy these pointers into registers if possible */ | ||
369 | register JSAMPLE * range_limit = cinfo->sample_range_limit; | ||
370 | register int * Crrtab = cconvert->Cr_r_tab; | ||
371 | register int * Cbbtab = cconvert->Cb_b_tab; | ||
372 | register INT32 * Crgtab = cconvert->Cr_g_tab; | ||
373 | register INT32 * Cbgtab = cconvert->Cb_g_tab; | ||
374 | SHIFT_TEMPS | ||
375 | |||
376 | while (--num_rows >= 0) { | ||
377 | inptr0 = input_buf[0][input_row]; | ||
378 | inptr1 = input_buf[1][input_row]; | ||
379 | inptr2 = input_buf[2][input_row]; | ||
380 | inptr3 = input_buf[3][input_row]; | ||
381 | input_row++; | ||
382 | outptr = *output_buf++; | ||
383 | for (col = 0; col < num_cols; col++) { | ||
384 | y = GETJSAMPLE(inptr0[col]); | ||
385 | cb = GETJSAMPLE(inptr1[col]); | ||
386 | cr = GETJSAMPLE(inptr2[col]); | ||
387 | /* Range-limiting is essential due to noise introduced by DCT losses. */ | ||
388 | outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])]; /* red */ | ||
389 | outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */ | ||
390 | ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], | ||
391 | SCALEBITS)))]; | ||
392 | outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])]; /* blue */ | ||
393 | /* K passes through unchanged */ | ||
394 | outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */ | ||
395 | outptr += 4; | ||
396 | } | ||
397 | } | ||
398 | } | ||
399 | |||
400 | |||
401 | /* | ||
402 | * Empty method for start_pass. | ||
403 | */ | ||
404 | |||
405 | METHODDEF(void) | ||
406 | start_pass_dcolor (j_decompress_ptr cinfo) | ||
407 | { | ||
408 | /* no work needed */ | ||
409 | } | ||
410 | |||
411 | |||
412 | /* | ||
413 | * Module initialization routine for output colorspace conversion. | ||
414 | */ | ||
415 | |||
416 | GLOBAL(void) | ||
417 | jinit_color_deconverter (j_decompress_ptr cinfo) | ||
418 | { | ||
419 | my_cconvert_ptr cconvert; | ||
420 | int ci; | ||
421 | |||
422 | cconvert = (my_cconvert_ptr) | ||
423 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
424 | SIZEOF(my_color_deconverter)); | ||
425 | cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert; | ||
426 | cconvert->pub.start_pass = start_pass_dcolor; | ||
427 | |||
428 | /* Make sure num_components agrees with jpeg_color_space */ | ||
429 | switch (cinfo->jpeg_color_space) { | ||
430 | case JCS_GRAYSCALE: | ||
431 | if (cinfo->num_components != 1) | ||
432 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | ||
433 | break; | ||
434 | |||
435 | case JCS_RGB: | ||
436 | case JCS_YCbCr: | ||
437 | if (cinfo->num_components != 3) | ||
438 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | ||
439 | break; | ||
440 | |||
441 | case JCS_CMYK: | ||
442 | case JCS_YCCK: | ||
443 | if (cinfo->num_components != 4) | ||
444 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | ||
445 | break; | ||
446 | |||
447 | default: /* JCS_UNKNOWN can be anything */ | ||
448 | if (cinfo->num_components < 1) | ||
449 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); | ||
450 | break; | ||
451 | } | ||
452 | |||
453 | /* Set out_color_components and conversion method based on requested space. | ||
454 | * Also clear the component_needed flags for any unused components, | ||
455 | * so that earlier pipeline stages can avoid useless computation. | ||
456 | */ | ||
457 | |||
458 | switch (cinfo->out_color_space) { | ||
459 | case JCS_GRAYSCALE: | ||
460 | cinfo->out_color_components = 1; | ||
461 | if (cinfo->jpeg_color_space == JCS_GRAYSCALE || | ||
462 | cinfo->jpeg_color_space == JCS_YCbCr) { | ||
463 | cconvert->pub.color_convert = grayscale_convert; | ||
464 | /* For color->grayscale conversion, only the Y (0) component is needed */ | ||
465 | for (ci = 1; ci < cinfo->num_components; ci++) | ||
466 | cinfo->comp_info[ci].component_needed = FALSE; | ||
467 | } else if (cinfo->jpeg_color_space == JCS_RGB) { | ||
468 | cconvert->pub.color_convert = rgb_gray_convert; | ||
469 | build_rgb_y_table(cinfo); | ||
470 | } else | ||
471 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | ||
472 | break; | ||
473 | |||
474 | case JCS_RGB: | ||
475 | cinfo->out_color_components = RGB_PIXELSIZE; | ||
476 | if (cinfo->jpeg_color_space == JCS_YCbCr) { | ||
477 | cconvert->pub.color_convert = ycc_rgb_convert; | ||
478 | build_ycc_rgb_table(cinfo); | ||
479 | } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { | ||
480 | cconvert->pub.color_convert = gray_rgb_convert; | ||
481 | } else if (cinfo->jpeg_color_space == JCS_RGB) { | ||
482 | cconvert->pub.color_convert = rgb_convert; | ||
483 | } else | ||
484 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | ||
485 | break; | ||
486 | |||
487 | case JCS_CMYK: | ||
488 | cinfo->out_color_components = 4; | ||
489 | if (cinfo->jpeg_color_space == JCS_YCCK) { | ||
490 | cconvert->pub.color_convert = ycck_cmyk_convert; | ||
491 | build_ycc_rgb_table(cinfo); | ||
492 | } else if (cinfo->jpeg_color_space == JCS_CMYK) { | ||
493 | cconvert->pub.color_convert = null_convert; | ||
494 | } else | ||
495 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | ||
496 | break; | ||
497 | |||
498 | default: | ||
499 | /* Permit null conversion to same output space */ | ||
500 | if (cinfo->out_color_space == cinfo->jpeg_color_space) { | ||
501 | cinfo->out_color_components = cinfo->num_components; | ||
502 | cconvert->pub.color_convert = null_convert; | ||
503 | } else /* unsupported non-null conversion */ | ||
504 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); | ||
505 | break; | ||
506 | } | ||
507 | |||
508 | if (cinfo->quantize_colors) | ||
509 | cinfo->output_components = 1; /* single colormapped output component */ | ||
510 | else | ||
511 | cinfo->output_components = cinfo->out_color_components; | ||
512 | } | ||