The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * jdcolor.c |
| 3 | * |
| 4 | * Copyright (C) 1991-1997, Thomas G. Lane. |
| 5 | * This file is part of the Independent JPEG Group's software. |
| 6 | * For conditions of distribution and use, see the accompanying README file. |
| 7 | * |
| 8 | * This file contains output colorspace conversion routines. |
| 9 | */ |
| 10 | |
| 11 | #define JPEG_INTERNALS |
| 12 | #include "jinclude.h" |
| 13 | #include "jpeglib.h" |
Prajakta Gudadhe | 6a3be8d | 2012-06-11 14:08:27 -0700 | [diff] [blame] | 14 | #ifdef NV_ARM_NEON |
| 15 | #include "jsimd_neon.h" |
| 16 | #endif |
The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 17 | |
| 18 | /* Private subobject */ |
| 19 | |
| 20 | typedef struct { |
| 21 | struct jpeg_color_deconverter pub; /* public fields */ |
| 22 | |
| 23 | /* Private state for YCC->RGB conversion */ |
| 24 | int * Cr_r_tab; /* => table for Cr to R conversion */ |
| 25 | int * Cb_b_tab; /* => table for Cb to B conversion */ |
| 26 | INT32 * Cr_g_tab; /* => table for Cr to G conversion */ |
| 27 | INT32 * Cb_g_tab; /* => table for Cb to G conversion */ |
| 28 | } my_color_deconverter; |
| 29 | |
| 30 | typedef my_color_deconverter * my_cconvert_ptr; |
| 31 | |
| 32 | |
| 33 | #ifdef ANDROID_RGB |
| 34 | |
| 35 | /* Declarations for ordered dithering. |
| 36 | * |
| 37 | * We use 4x4 ordered dither array packed into 32 bits. This array is |
| 38 | * sufficent for dithering RGB_888 to RGB_565. |
| 39 | */ |
| 40 | |
| 41 | #define DITHER_MASK 0x3 |
| 42 | #define DITHER_ROTATE(x) (((x)<<24) | (((x)>>8)&0x00FFFFFF)) |
| 43 | static const INT32 dither_matrix[4] = { |
| 44 | 0x0008020A, |
| 45 | 0x0C040E06, |
| 46 | 0x030B0109, |
| 47 | 0x0F070D05 |
| 48 | }; |
| 49 | |
| 50 | #endif |
| 51 | |
| 52 | |
| 53 | /**************** YCbCr -> RGB conversion: most common case **************/ |
| 54 | |
| 55 | /* |
| 56 | * YCbCr is defined per CCIR 601-1, except that Cb and Cr are |
| 57 | * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. |
| 58 | * The conversion equations to be implemented are therefore |
| 59 | * R = Y + 1.40200 * Cr |
| 60 | * G = Y - 0.34414 * Cb - 0.71414 * Cr |
| 61 | * B = Y + 1.77200 * Cb |
| 62 | * where Cb and Cr represent the incoming values less CENTERJSAMPLE. |
| 63 | * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.) |
| 64 | * |
| 65 | * To avoid floating-point arithmetic, we represent the fractional constants |
| 66 | * as integers scaled up by 2^16 (about 4 digits precision); we have to divide |
| 67 | * the products by 2^16, with appropriate rounding, to get the correct answer. |
| 68 | * Notice that Y, being an integral input, does not contribute any fraction |
| 69 | * so it need not participate in the rounding. |
| 70 | * |
| 71 | * For even more speed, we avoid doing any multiplications in the inner loop |
| 72 | * by precalculating the constants times Cb and Cr for all possible values. |
| 73 | * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table); |
| 74 | * for 12-bit samples it is still acceptable. It's not very reasonable for |
| 75 | * 16-bit samples, but if you want lossless storage you shouldn't be changing |
| 76 | * colorspace anyway. |
| 77 | * The Cr=>R and Cb=>B values can be rounded to integers in advance; the |
| 78 | * values for the G calculation are left scaled up, since we must add them |
| 79 | * together before rounding. |
| 80 | */ |
| 81 | |
| 82 | #define SCALEBITS 16 /* speediest right-shift on some machines */ |
| 83 | #define ONE_HALF ((INT32) 1 << (SCALEBITS-1)) |
| 84 | #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5)) |
| 85 | |
| 86 | |
| 87 | /* |
| 88 | * Initialize tables for YCC->RGB colorspace conversion. |
| 89 | */ |
| 90 | |
| 91 | LOCAL(void) |
| 92 | build_ycc_rgb_table (j_decompress_ptr cinfo) |
| 93 | { |
| 94 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 95 | int i; |
| 96 | INT32 x; |
| 97 | SHIFT_TEMPS |
| 98 | |
| 99 | cconvert->Cr_r_tab = (int *) |
| 100 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 101 | (MAXJSAMPLE+1) * SIZEOF(int)); |
| 102 | cconvert->Cb_b_tab = (int *) |
| 103 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 104 | (MAXJSAMPLE+1) * SIZEOF(int)); |
| 105 | cconvert->Cr_g_tab = (INT32 *) |
| 106 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 107 | (MAXJSAMPLE+1) * SIZEOF(INT32)); |
| 108 | cconvert->Cb_g_tab = (INT32 *) |
| 109 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 110 | (MAXJSAMPLE+1) * SIZEOF(INT32)); |
| 111 | |
| 112 | for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
| 113 | /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
| 114 | /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
| 115 | /* Cr=>R value is nearest int to 1.40200 * x */ |
| 116 | cconvert->Cr_r_tab[i] = (int) |
| 117 | RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS); |
| 118 | /* Cb=>B value is nearest int to 1.77200 * x */ |
| 119 | cconvert->Cb_b_tab[i] = (int) |
| 120 | RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS); |
| 121 | /* Cr=>G value is scaled-up -0.71414 * x */ |
| 122 | cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x; |
| 123 | /* Cb=>G value is scaled-up -0.34414 * x */ |
| 124 | /* We also add in ONE_HALF so that need not do it in inner loop */ |
| 125 | cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF; |
| 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 | #ifdef ANDROID_RGB |
| 181 | METHODDEF(void) |
| 182 | ycc_rgba_8888_convert (j_decompress_ptr cinfo, |
| 183 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 184 | JSAMPARRAY output_buf, int num_rows) |
| 185 | { |
| 186 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 187 | register int y, cb, cr; |
| 188 | register JSAMPROW outptr; |
| 189 | register JSAMPROW inptr0, inptr1, inptr2; |
| 190 | register JDIMENSION col; |
| 191 | JDIMENSION num_cols = cinfo->output_width; |
| 192 | /* copy these pointers into registers if possible */ |
| 193 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 194 | register int * Crrtab = cconvert->Cr_r_tab; |
| 195 | register int * Cbbtab = cconvert->Cb_b_tab; |
| 196 | register INT32 * Crgtab = cconvert->Cr_g_tab; |
| 197 | register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| 198 | SHIFT_TEMPS |
| 199 | |
| 200 | while (--num_rows >= 0) { |
| 201 | inptr0 = input_buf[0][input_row]; |
| 202 | inptr1 = input_buf[1][input_row]; |
| 203 | inptr2 = input_buf[2][input_row]; |
| 204 | input_row++; |
| 205 | outptr = *output_buf++; |
| 206 | for (col = 0; col < num_cols; col++) { |
| 207 | y = GETJSAMPLE(inptr0[col]); |
| 208 | cb = GETJSAMPLE(inptr1[col]); |
| 209 | cr = GETJSAMPLE(inptr2[col]); |
| 210 | /* Range-limiting is essential due to noise introduced by DCT losses. */ |
| 211 | outptr[RGB_RED] = range_limit[y + Crrtab[cr]]; |
| 212 | outptr[RGB_GREEN] = range_limit[y + |
| 213 | ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 214 | SCALEBITS))]; |
| 215 | outptr[RGB_BLUE] = range_limit[y + Cbbtab[cb]]; |
| 216 | outptr[RGB_ALPHA] = 0xFF; |
| 217 | outptr += 4; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | METHODDEF(void) |
| 223 | ycc_rgb_565_convert (j_decompress_ptr cinfo, |
| 224 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 225 | JSAMPARRAY output_buf, int num_rows) |
| 226 | { |
| 227 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 228 | register int y, cb, cr; |
| 229 | register JSAMPROW outptr; |
| 230 | register JSAMPROW inptr0, inptr1, inptr2; |
| 231 | register JDIMENSION col; |
| 232 | JDIMENSION num_cols = cinfo->output_width; |
| 233 | /* copy these pointers into registers if possible */ |
| 234 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 235 | register int * Crrtab = cconvert->Cr_r_tab; |
| 236 | register int * Cbbtab = cconvert->Cb_b_tab; |
| 237 | register INT32 * Crgtab = cconvert->Cr_g_tab; |
| 238 | register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| 239 | SHIFT_TEMPS |
| 240 | |
| 241 | while (--num_rows >= 0) { |
| 242 | INT32 rgb; |
| 243 | unsigned int r, g, b; |
| 244 | inptr0 = input_buf[0][input_row]; |
| 245 | inptr1 = input_buf[1][input_row]; |
| 246 | inptr2 = input_buf[2][input_row]; |
| 247 | input_row++; |
| 248 | outptr = *output_buf++; |
| 249 | |
| 250 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 251 | y = GETJSAMPLE(*inptr0++); |
| 252 | cb = GETJSAMPLE(*inptr1++); |
| 253 | cr = GETJSAMPLE(*inptr2++); |
| 254 | r = range_limit[y + Crrtab[cr]]; |
| 255 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS))]; |
| 256 | b = range_limit[y + Cbbtab[cb]]; |
| 257 | rgb = PACK_SHORT_565(r,g,b); |
| 258 | *(INT16*)outptr = rgb; |
| 259 | outptr += 2; |
| 260 | num_cols--; |
| 261 | } |
| 262 | for (col = 0; col < (num_cols>>1); col++) { |
| 263 | y = GETJSAMPLE(*inptr0++); |
| 264 | cb = GETJSAMPLE(*inptr1++); |
| 265 | cr = GETJSAMPLE(*inptr2++); |
| 266 | r = range_limit[y + Crrtab[cr]]; |
| 267 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS))]; |
| 268 | b = range_limit[y + Cbbtab[cb]]; |
| 269 | rgb = PACK_SHORT_565(r,g,b); |
| 270 | |
| 271 | y = GETJSAMPLE(*inptr0++); |
| 272 | cb = GETJSAMPLE(*inptr1++); |
| 273 | cr = GETJSAMPLE(*inptr2++); |
| 274 | r = range_limit[y + Crrtab[cr]]; |
| 275 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS))]; |
| 276 | b = range_limit[y + Cbbtab[cb]]; |
| 277 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 278 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 279 | outptr += 4; |
| 280 | } |
| 281 | if (num_cols&1) { |
| 282 | y = GETJSAMPLE(*inptr0); |
| 283 | cb = GETJSAMPLE(*inptr1); |
| 284 | cr = GETJSAMPLE(*inptr2); |
| 285 | r = range_limit[y + Crrtab[cr]]; |
| 286 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS))]; |
| 287 | b = range_limit[y + Cbbtab[cb]]; |
| 288 | rgb = PACK_SHORT_565(r,g,b); |
| 289 | *(INT16*)outptr = rgb; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | METHODDEF(void) |
| 295 | ycc_rgb_565D_convert (j_decompress_ptr cinfo, |
| 296 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 297 | JSAMPARRAY output_buf, int num_rows) |
| 298 | { |
| 299 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 300 | register int y, cb, cr; |
| 301 | register JSAMPROW outptr; |
| 302 | register JSAMPROW inptr0, inptr1, inptr2; |
| 303 | register JDIMENSION col; |
| 304 | JDIMENSION num_cols = cinfo->output_width; |
| 305 | /* copy these pointers into registers if possible */ |
| 306 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 307 | register int * Crrtab = cconvert->Cr_r_tab; |
| 308 | register int * Cbbtab = cconvert->Cb_b_tab; |
| 309 | register INT32 * Crgtab = cconvert->Cr_g_tab; |
| 310 | register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| 311 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 312 | SHIFT_TEMPS |
| 313 | |
| 314 | while (--num_rows >= 0) { |
| 315 | INT32 rgb; |
| 316 | unsigned int r, g, b; |
| 317 | inptr0 = input_buf[0][input_row]; |
| 318 | inptr1 = input_buf[1][input_row]; |
| 319 | inptr2 = input_buf[2][input_row]; |
| 320 | input_row++; |
| 321 | outptr = *output_buf++; |
| 322 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 323 | y = GETJSAMPLE(*inptr0++); |
| 324 | cb = GETJSAMPLE(*inptr1++); |
| 325 | cr = GETJSAMPLE(*inptr2++); |
| 326 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 327 | g = range_limit[DITHER_565_G(y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS)), d0)]; |
| 328 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 329 | rgb = PACK_SHORT_565(r,g,b); |
| 330 | *(INT16*)outptr = rgb; |
| 331 | outptr += 2; |
| 332 | num_cols--; |
| 333 | } |
| 334 | for (col = 0; col < (num_cols>>1); col++) { |
| 335 | y = GETJSAMPLE(*inptr0++); |
| 336 | cb = GETJSAMPLE(*inptr1++); |
| 337 | cr = GETJSAMPLE(*inptr2++); |
| 338 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 339 | g = range_limit[DITHER_565_G(y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS)), d0)]; |
| 340 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 341 | d0 = DITHER_ROTATE(d0); |
| 342 | rgb = PACK_SHORT_565(r,g,b); |
| 343 | y = GETJSAMPLE(*inptr0++); |
| 344 | cb = GETJSAMPLE(*inptr1++); |
| 345 | cr = GETJSAMPLE(*inptr2++); |
| 346 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 347 | g = range_limit[DITHER_565_G(y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS)), d0)]; |
| 348 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 349 | d0 = DITHER_ROTATE(d0); |
| 350 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 351 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 352 | outptr += 4; |
| 353 | } |
| 354 | if (num_cols&1) { |
| 355 | y = GETJSAMPLE(*inptr0); |
| 356 | cb = GETJSAMPLE(*inptr1); |
| 357 | cr = GETJSAMPLE(*inptr2); |
| 358 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 359 | g = range_limit[DITHER_565_G(y + ((int)RIGHT_SHIFT(Cbgtab[cb]+Crgtab[cr], SCALEBITS)), d0)]; |
| 360 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 361 | rgb = PACK_SHORT_565(r,g,b); |
| 362 | *(INT16*)outptr = rgb; |
| 363 | } |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | #endif |
| 368 | |
| 369 | /**************** Cases other than YCbCr -> RGB(A) **************/ |
| 370 | |
| 371 | #ifdef ANDROID_RGB |
| 372 | METHODDEF(void) |
| 373 | rgb_rgba_8888_convert (j_decompress_ptr cinfo, |
| 374 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 375 | JSAMPARRAY output_buf, int num_rows) |
| 376 | { |
| 377 | register JSAMPROW outptr; |
| 378 | register JSAMPROW inptr0, inptr1, inptr2; |
| 379 | register JDIMENSION col; |
| 380 | JDIMENSION num_cols = cinfo->output_width; |
| 381 | SHIFT_TEMPS |
| 382 | |
| 383 | while (--num_rows >= 0) { |
| 384 | inptr0 = input_buf[0][input_row]; |
| 385 | inptr1 = input_buf[1][input_row]; |
| 386 | inptr2 = input_buf[2][input_row]; |
| 387 | input_row++; |
| 388 | outptr = *output_buf++; |
| 389 | for (col = 0; col < num_cols; col++) { |
| 390 | *outptr++ = *inptr0++; |
| 391 | *outptr++ = *inptr1++; |
| 392 | *outptr++ = *inptr2++; |
| 393 | *outptr++ = 0xFF; |
| 394 | } |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | METHODDEF(void) |
| 399 | rgb_rgb_565_convert (j_decompress_ptr cinfo, |
| 400 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 401 | JSAMPARRAY output_buf, int num_rows) |
| 402 | { |
| 403 | register JSAMPROW outptr; |
| 404 | register JSAMPROW inptr0, inptr1, inptr2; |
| 405 | register JDIMENSION col; |
| 406 | JDIMENSION num_cols = cinfo->output_width; |
| 407 | SHIFT_TEMPS |
| 408 | |
| 409 | while (--num_rows >= 0) { |
| 410 | INT32 rgb; |
| 411 | unsigned int r, g, b; |
| 412 | inptr0 = input_buf[0][input_row]; |
| 413 | inptr1 = input_buf[1][input_row]; |
| 414 | inptr2 = input_buf[2][input_row]; |
| 415 | input_row++; |
| 416 | outptr = *output_buf++; |
| 417 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 418 | r = GETJSAMPLE(*inptr0++); |
| 419 | g = GETJSAMPLE(*inptr1++); |
| 420 | b = GETJSAMPLE(*inptr2++); |
| 421 | rgb = PACK_SHORT_565(r,g,b); |
| 422 | *(INT16*)outptr = rgb; |
| 423 | outptr += 2; |
| 424 | num_cols--; |
| 425 | } |
| 426 | for (col = 0; col < (num_cols>>1); col++) { |
| 427 | r = GETJSAMPLE(*inptr0++); |
| 428 | g = GETJSAMPLE(*inptr1++); |
| 429 | b = GETJSAMPLE(*inptr2++); |
| 430 | rgb = PACK_SHORT_565(r,g,b); |
| 431 | r = GETJSAMPLE(*inptr0++); |
| 432 | g = GETJSAMPLE(*inptr1++); |
| 433 | b = GETJSAMPLE(*inptr2++); |
| 434 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 435 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 436 | outptr += 4; |
| 437 | } |
| 438 | if (num_cols&1) { |
| 439 | r = GETJSAMPLE(*inptr0); |
| 440 | g = GETJSAMPLE(*inptr1); |
| 441 | b = GETJSAMPLE(*inptr2); |
| 442 | rgb = PACK_SHORT_565(r,g,b); |
| 443 | *(INT16*)outptr = rgb; |
| 444 | } |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | |
| 449 | METHODDEF(void) |
| 450 | rgb_rgb_565D_convert (j_decompress_ptr cinfo, |
| 451 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 452 | JSAMPARRAY output_buf, int num_rows) |
| 453 | { |
| 454 | register JSAMPROW outptr; |
| 455 | register JSAMPROW inptr0, inptr1, inptr2; |
| 456 | register JDIMENSION col; |
| 457 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 458 | JDIMENSION num_cols = cinfo->output_width; |
| 459 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 460 | SHIFT_TEMPS |
| 461 | |
| 462 | while (--num_rows >= 0) { |
| 463 | INT32 rgb; |
| 464 | unsigned int r, g, b; |
| 465 | inptr0 = input_buf[0][input_row]; |
| 466 | inptr1 = input_buf[1][input_row]; |
| 467 | inptr2 = input_buf[2][input_row]; |
| 468 | input_row++; |
| 469 | outptr = *output_buf++; |
| 470 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 471 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)]; |
| 472 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)]; |
| 473 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)]; |
| 474 | rgb = PACK_SHORT_565(r,g,b); |
| 475 | *(INT16*)outptr = rgb; |
| 476 | outptr += 2; |
| 477 | num_cols--; |
| 478 | } |
| 479 | for (col = 0; col < (num_cols>>1); col++) { |
| 480 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)]; |
| 481 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)]; |
| 482 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)]; |
| 483 | d0 = DITHER_ROTATE(d0); |
| 484 | rgb = PACK_SHORT_565(r,g,b); |
| 485 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)]; |
| 486 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)]; |
| 487 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)]; |
| 488 | d0 = DITHER_ROTATE(d0); |
| 489 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 490 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 491 | outptr += 4; |
| 492 | } |
| 493 | if (num_cols&1) { |
| 494 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0), d0)]; |
| 495 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1), d0)]; |
| 496 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2), d0)]; |
| 497 | rgb = PACK_SHORT_565(r,g,b); |
| 498 | *(INT16*)outptr = rgb; |
| 499 | } |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | #endif |
| 504 | |
| 505 | /* |
| 506 | * Color conversion for no colorspace change: just copy the data, |
| 507 | * converting from separate-planes to interleaved representation. |
| 508 | */ |
| 509 | |
| 510 | METHODDEF(void) |
| 511 | null_convert (j_decompress_ptr cinfo, |
| 512 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 513 | JSAMPARRAY output_buf, int num_rows) |
| 514 | { |
| 515 | register JSAMPROW inptr, outptr; |
| 516 | register JDIMENSION count; |
| 517 | register int num_components = cinfo->num_components; |
| 518 | JDIMENSION num_cols = cinfo->output_width; |
| 519 | int ci; |
| 520 | |
| 521 | while (--num_rows >= 0) { |
| 522 | for (ci = 0; ci < num_components; ci++) { |
| 523 | inptr = input_buf[ci][input_row]; |
| 524 | outptr = output_buf[0] + ci; |
| 525 | for (count = num_cols; count > 0; count--) { |
| 526 | *outptr = *inptr++; /* needn't bother with GETJSAMPLE() here */ |
| 527 | outptr += num_components; |
| 528 | } |
| 529 | } |
| 530 | input_row++; |
| 531 | output_buf++; |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | |
| 536 | /* |
| 537 | * Color conversion for grayscale: just copy the data. |
| 538 | * This also works for YCbCr -> grayscale conversion, in which |
| 539 | * we just copy the Y (luminance) component and ignore chrominance. |
| 540 | */ |
| 541 | |
| 542 | METHODDEF(void) |
| 543 | grayscale_convert (j_decompress_ptr cinfo, |
| 544 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 545 | JSAMPARRAY output_buf, int num_rows) |
| 546 | { |
| 547 | jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0, |
| 548 | num_rows, cinfo->output_width); |
| 549 | } |
| 550 | |
| 551 | |
| 552 | /* |
| 553 | * Convert grayscale to RGB: just duplicate the graylevel three times. |
| 554 | * This is provided to support applications that don't want to cope |
| 555 | * with grayscale as a separate case. |
| 556 | */ |
| 557 | |
| 558 | METHODDEF(void) |
| 559 | gray_rgb_convert (j_decompress_ptr cinfo, |
| 560 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 561 | JSAMPARRAY output_buf, int num_rows) |
| 562 | { |
| 563 | register JSAMPROW inptr, outptr; |
| 564 | register JDIMENSION col; |
| 565 | JDIMENSION num_cols = cinfo->output_width; |
| 566 | |
| 567 | while (--num_rows >= 0) { |
| 568 | inptr = input_buf[0][input_row++]; |
| 569 | outptr = *output_buf++; |
| 570 | for (col = 0; col < num_cols; col++) { |
| 571 | /* We can dispense with GETJSAMPLE() here */ |
| 572 | outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col]; |
| 573 | outptr += RGB_PIXELSIZE; |
| 574 | } |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | #ifdef ANDROID_RGB |
| 579 | METHODDEF(void) |
| 580 | gray_rgba_8888_convert (j_decompress_ptr cinfo, |
| 581 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 582 | JSAMPARRAY output_buf, int num_rows) |
| 583 | { |
| 584 | register JSAMPROW inptr, outptr; |
| 585 | register JDIMENSION col; |
| 586 | JDIMENSION num_cols = cinfo->output_width; |
| 587 | |
| 588 | while (--num_rows >= 0) { |
| 589 | inptr = input_buf[0][input_row++]; |
| 590 | outptr = *output_buf++; |
| 591 | for (col = 0; col < num_cols; col++) { |
| 592 | /* We can dispense with GETJSAMPLE() here */ |
| 593 | outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col]; |
| 594 | outptr[RGB_ALPHA] = 0xff; |
| 595 | outptr += 4; |
| 596 | } |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | METHODDEF(void) |
| 601 | gray_rgb_565_convert (j_decompress_ptr cinfo, |
| 602 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 603 | JSAMPARRAY output_buf, int num_rows) |
| 604 | { |
| 605 | register JSAMPROW inptr, outptr; |
| 606 | register JDIMENSION col; |
| 607 | JDIMENSION num_cols = cinfo->output_width; |
| 608 | |
| 609 | while (--num_rows >= 0) { |
| 610 | INT32 rgb; |
| 611 | unsigned int g; |
| 612 | inptr = input_buf[0][input_row++]; |
| 613 | outptr = *output_buf++; |
| 614 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 615 | g = *inptr++; |
| 616 | rgb = PACK_SHORT_565(g, g, g); |
| 617 | *(INT16*)outptr = rgb; |
| 618 | outptr += 2; |
| 619 | num_cols--; |
| 620 | } |
| 621 | for (col = 0; col < (num_cols>>1); col++) { |
| 622 | g = *inptr++; |
| 623 | rgb = PACK_SHORT_565(g, g, g); |
| 624 | g = *inptr++; |
| 625 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g)); |
| 626 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 627 | outptr += 4; |
| 628 | } |
| 629 | if (num_cols&1) { |
| 630 | g = *inptr; |
| 631 | rgb = PACK_SHORT_565(g, g, g); |
| 632 | *(INT16*)outptr = rgb; |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | METHODDEF(void) |
| 638 | gray_rgb_565D_convert (j_decompress_ptr cinfo, |
| 639 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 640 | JSAMPARRAY output_buf, int num_rows) |
| 641 | { |
| 642 | register JSAMPROW inptr, outptr; |
| 643 | register JDIMENSION col; |
| 644 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 645 | JDIMENSION num_cols = cinfo->output_width; |
| 646 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 647 | |
| 648 | while (--num_rows >= 0) { |
| 649 | INT32 rgb; |
| 650 | unsigned int g; |
| 651 | inptr = input_buf[0][input_row++]; |
| 652 | outptr = *output_buf++; |
| 653 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 654 | g = *inptr++; |
| 655 | g = range_limit[DITHER_565_R(g, d0)]; |
| 656 | rgb = PACK_SHORT_565(g, g, g); |
| 657 | *(INT16*)outptr = rgb; |
| 658 | outptr += 2; |
| 659 | num_cols--; |
| 660 | } |
| 661 | for (col = 0; col < (num_cols>>1); col++) { |
| 662 | g = *inptr++; |
| 663 | g = range_limit[DITHER_565_R(g, d0)]; |
| 664 | rgb = PACK_SHORT_565(g, g, g); |
| 665 | d0 = DITHER_ROTATE(d0); |
| 666 | g = *inptr++; |
| 667 | g = range_limit[DITHER_565_R(g, d0)]; |
| 668 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g)); |
| 669 | d0 = DITHER_ROTATE(d0); |
| 670 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 671 | outptr += 4; |
| 672 | } |
| 673 | if (num_cols&1) { |
| 674 | g = *inptr; |
| 675 | g = range_limit[DITHER_565_R(g, d0)]; |
| 676 | rgb = PACK_SHORT_565(g, g, g); |
| 677 | *(INT16*)outptr = rgb; |
| 678 | } |
| 679 | } |
| 680 | } |
| 681 | #endif |
| 682 | |
| 683 | /* |
| 684 | * Adobe-style YCCK->CMYK conversion. |
| 685 | * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same |
| 686 | * conversion as above, while passing K (black) unchanged. |
| 687 | * We assume build_ycc_rgb_table has been called. |
| 688 | */ |
| 689 | |
| 690 | METHODDEF(void) |
| 691 | ycck_cmyk_convert (j_decompress_ptr cinfo, |
| 692 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 693 | JSAMPARRAY output_buf, int num_rows) |
| 694 | { |
| 695 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 696 | register int y, cb, cr; |
| 697 | register JSAMPROW outptr; |
| 698 | register JSAMPROW inptr0, inptr1, inptr2, inptr3; |
| 699 | register JDIMENSION col; |
| 700 | JDIMENSION num_cols = cinfo->output_width; |
| 701 | /* copy these pointers into registers if possible */ |
| 702 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 703 | register int * Crrtab = cconvert->Cr_r_tab; |
| 704 | register int * Cbbtab = cconvert->Cb_b_tab; |
| 705 | register INT32 * Crgtab = cconvert->Cr_g_tab; |
| 706 | register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| 707 | SHIFT_TEMPS |
| 708 | |
| 709 | while (--num_rows >= 0) { |
| 710 | inptr0 = input_buf[0][input_row]; |
| 711 | inptr1 = input_buf[1][input_row]; |
| 712 | inptr2 = input_buf[2][input_row]; |
| 713 | inptr3 = input_buf[3][input_row]; |
| 714 | input_row++; |
| 715 | outptr = *output_buf++; |
| 716 | for (col = 0; col < num_cols; col++) { |
| 717 | y = GETJSAMPLE(inptr0[col]); |
| 718 | cb = GETJSAMPLE(inptr1[col]); |
| 719 | cr = GETJSAMPLE(inptr2[col]); |
| 720 | /* Range-limiting is essential due to noise introduced by DCT losses. */ |
| 721 | outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])]; /* red */ |
| 722 | outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */ |
| 723 | ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 724 | SCALEBITS)))]; |
| 725 | outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])]; /* blue */ |
| 726 | /* K passes through unchanged */ |
| 727 | outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */ |
| 728 | outptr += 4; |
| 729 | } |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | |
| 734 | /* |
| 735 | * Empty method for start_pass. |
| 736 | */ |
| 737 | |
| 738 | METHODDEF(void) |
| 739 | start_pass_dcolor (j_decompress_ptr cinfo) |
| 740 | { |
| 741 | /* no work needed */ |
| 742 | } |
| 743 | |
| 744 | |
| 745 | /* |
| 746 | * Module initialization routine for output colorspace conversion. |
| 747 | */ |
| 748 | |
| 749 | GLOBAL(void) |
| 750 | jinit_color_deconverter (j_decompress_ptr cinfo) |
| 751 | { |
| 752 | my_cconvert_ptr cconvert; |
| 753 | int ci; |
| 754 | |
| 755 | cconvert = (my_cconvert_ptr) |
| 756 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 757 | SIZEOF(my_color_deconverter)); |
| 758 | cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert; |
| 759 | cconvert->pub.start_pass = start_pass_dcolor; |
| 760 | |
| 761 | /* Make sure num_components agrees with jpeg_color_space */ |
| 762 | switch (cinfo->jpeg_color_space) { |
| 763 | case JCS_GRAYSCALE: |
| 764 | if (cinfo->num_components != 1) |
| 765 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 766 | break; |
| 767 | |
| 768 | case JCS_RGB: |
| 769 | case JCS_YCbCr: |
| 770 | if (cinfo->num_components != 3) |
| 771 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 772 | break; |
| 773 | |
| 774 | case JCS_CMYK: |
| 775 | case JCS_YCCK: |
| 776 | if (cinfo->num_components != 4) |
| 777 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 778 | break; |
| 779 | |
| 780 | default: /* JCS_UNKNOWN can be anything */ |
| 781 | if (cinfo->num_components < 1) |
| 782 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 783 | break; |
| 784 | } |
| 785 | |
| 786 | /* Set out_color_components and conversion method based on requested space. |
| 787 | * Also clear the component_needed flags for any unused components, |
| 788 | * so that earlier pipeline stages can avoid useless computation. |
| 789 | */ |
| 790 | |
| 791 | switch (cinfo->out_color_space) { |
| 792 | case JCS_GRAYSCALE: |
| 793 | cinfo->out_color_components = 1; |
| 794 | if (cinfo->jpeg_color_space == JCS_GRAYSCALE || |
| 795 | cinfo->jpeg_color_space == JCS_YCbCr) { |
| 796 | cconvert->pub.color_convert = grayscale_convert; |
| 797 | /* For color->grayscale conversion, only the Y (0) component is needed */ |
| 798 | for (ci = 1; ci < cinfo->num_components; ci++) |
| 799 | cinfo->comp_info[ci].component_needed = FALSE; |
| 800 | } else |
| 801 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 802 | break; |
| 803 | |
| 804 | case JCS_RGB: |
| 805 | cinfo->out_color_components = RGB_PIXELSIZE; |
| 806 | if (cinfo->jpeg_color_space == JCS_YCbCr) { |
| 807 | cconvert->pub.color_convert = ycc_rgb_convert; |
| 808 | build_ycc_rgb_table(cinfo); |
| 809 | } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| 810 | cconvert->pub.color_convert = gray_rgb_convert; |
| 811 | } else if (cinfo->jpeg_color_space == JCS_RGB && RGB_PIXELSIZE == 3) { |
| 812 | cconvert->pub.color_convert = null_convert; |
| 813 | } else |
| 814 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 815 | break; |
| 816 | |
| 817 | #ifdef ANDROID_RGB |
| 818 | case JCS_RGBA_8888: |
| 819 | cinfo->out_color_components = 4; |
| 820 | if (cinfo->jpeg_color_space == JCS_YCbCr) { |
Prajakta Gudadhe | 6a3be8d | 2012-06-11 14:08:27 -0700 | [diff] [blame] | 821 | #if defined(NV_ARM_NEON) && defined(__ARM_HAVE_NEON) |
| 822 | if (cap_neon_ycc_rgb()) { |
| 823 | cconvert->pub.color_convert = jsimd_ycc_rgba8888_convert; |
| 824 | } else { |
| 825 | cconvert->pub.color_convert = ycc_rgba_8888_convert; |
| 826 | } |
| 827 | #else |
The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 828 | cconvert->pub.color_convert = ycc_rgba_8888_convert; |
Prajakta Gudadhe | 6a3be8d | 2012-06-11 14:08:27 -0700 | [diff] [blame] | 829 | #endif |
The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 830 | build_ycc_rgb_table(cinfo); |
| 831 | } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| 832 | cconvert->pub.color_convert = gray_rgba_8888_convert; |
| 833 | } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| 834 | cconvert->pub.color_convert = rgb_rgba_8888_convert; |
| 835 | } else |
| 836 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 837 | break; |
| 838 | |
| 839 | case JCS_RGB_565: |
| 840 | cinfo->out_color_components = RGB_PIXELSIZE; |
| 841 | if (cinfo->dither_mode == JDITHER_NONE) { |
| 842 | if (cinfo->jpeg_color_space == JCS_YCbCr) { |
Prajakta Gudadhe | 6a3be8d | 2012-06-11 14:08:27 -0700 | [diff] [blame] | 843 | #if defined(NV_ARM_NEON) && defined(__ARM_HAVE_NEON) |
| 844 | if (cap_neon_ycc_rgb()) { |
| 845 | cconvert->pub.color_convert = jsimd_ycc_rgb565_convert; |
| 846 | } else { |
| 847 | cconvert->pub.color_convert = ycc_rgb_565_convert; |
| 848 | } |
| 849 | #else |
The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 850 | cconvert->pub.color_convert = ycc_rgb_565_convert; |
Prajakta Gudadhe | 6a3be8d | 2012-06-11 14:08:27 -0700 | [diff] [blame] | 851 | #endif |
The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 852 | build_ycc_rgb_table(cinfo); |
| 853 | } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| 854 | cconvert->pub.color_convert = gray_rgb_565_convert; |
| 855 | } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| 856 | cconvert->pub.color_convert = rgb_rgb_565_convert; |
| 857 | } else |
| 858 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 859 | } else { |
| 860 | /* only ordered dither is supported */ |
| 861 | if (cinfo->jpeg_color_space == JCS_YCbCr) { |
| 862 | cconvert->pub.color_convert = ycc_rgb_565D_convert; |
| 863 | build_ycc_rgb_table(cinfo); |
| 864 | } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| 865 | cconvert->pub.color_convert = gray_rgb_565D_convert; |
| 866 | } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| 867 | cconvert->pub.color_convert = rgb_rgb_565D_convert; |
| 868 | } else |
| 869 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 870 | } |
| 871 | break; |
| 872 | #endif |
| 873 | |
| 874 | case JCS_CMYK: |
| 875 | cinfo->out_color_components = 4; |
| 876 | if (cinfo->jpeg_color_space == JCS_YCCK) { |
| 877 | cconvert->pub.color_convert = ycck_cmyk_convert; |
| 878 | build_ycc_rgb_table(cinfo); |
| 879 | } else if (cinfo->jpeg_color_space == JCS_CMYK) { |
| 880 | cconvert->pub.color_convert = null_convert; |
| 881 | } else |
| 882 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 883 | break; |
| 884 | |
| 885 | default: |
| 886 | /* Permit null conversion to same output space */ |
| 887 | if (cinfo->out_color_space == cinfo->jpeg_color_space) { |
| 888 | cinfo->out_color_components = cinfo->num_components; |
| 889 | cconvert->pub.color_convert = null_convert; |
| 890 | } else /* unsupported non-null conversion */ |
| 891 | ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| 892 | break; |
| 893 | } |
| 894 | |
| 895 | if (cinfo->quantize_colors) |
| 896 | cinfo->output_components = 1; /* single colormapped output component */ |
| 897 | else |
| 898 | cinfo->output_components = cinfo->out_color_components; |
| 899 | } |