DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jdcol565.c |
| 3 | * |
| 4 | * This file was part of the Independent JPEG Group's software: |
| 5 | * Copyright (C) 1991-1997, Thomas G. Lane. |
| 6 | * Modifications: |
| 7 | * Copyright (C) 2013, Linaro Limited. |
| 8 | * For conditions of distribution and use, see the accompanying README file. |
| 9 | * |
| 10 | * This file contains output colorspace conversion routines. |
| 11 | */ |
| 12 | |
| 13 | /* This file is included by jdcolor.c */ |
| 14 | |
| 15 | |
| 16 | #define PACK_SHORT_565(r, g, b) ((((r) << 8) & 0xf800) | \ |
| 17 | (((g) << 3) & 0x7E0) | ((b) >> 3)) |
| 18 | #define PACK_TWO_PIXELS(l, r) ((r << 16) | l) |
| 19 | #define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3) |
| 20 | |
| 21 | #define WRITE_TWO_PIXELS(addr, pixels) { \ |
| 22 | ((INT16*)(addr))[0] = (pixels); \ |
| 23 | ((INT16*)(addr))[1] = (pixels) >> 16; \ |
| 24 | } |
| 25 | #define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) ((*(INT32 *)(addr)) = pixels) |
| 26 | |
| 27 | #define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF)) |
| 28 | #define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1)) |
| 29 | #define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF)) |
| 30 | |
| 31 | |
| 32 | /* Declarations for ordered dithering |
| 33 | * |
| 34 | * We use a 4x4 ordered dither array packed into 32 bits. This array is |
| 35 | * sufficent for dithering RGB888 to RGB565. |
| 36 | */ |
| 37 | |
| 38 | #define DITHER_MASK 0x3 |
| 39 | #define DITHER_ROTATE(x) (((x) << 24) | (((x) >> 8) & 0x00FFFFFF)) |
| 40 | static const INT32 dither_matrix[4] = { |
| 41 | 0x0008020A, |
| 42 | 0x0C040E06, |
| 43 | 0x030B0109, |
| 44 | 0x0F070D05 |
| 45 | }; |
| 46 | |
| 47 | |
| 48 | METHODDEF(void) |
| 49 | ycc_rgb565_convert (j_decompress_ptr cinfo, |
| 50 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 51 | JSAMPARRAY output_buf, int num_rows) |
| 52 | { |
| 53 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 54 | register int y, cb, cr; |
| 55 | register JSAMPROW outptr; |
| 56 | register JSAMPROW inptr0, inptr1, inptr2; |
| 57 | register JDIMENSION col; |
| 58 | JDIMENSION num_cols = cinfo->output_width; |
| 59 | /* copy these pointers into registers if possible */ |
| 60 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 61 | register int * Crrtab = cconvert->Cr_r_tab; |
| 62 | register int * Cbbtab = cconvert->Cb_b_tab; |
| 63 | register INT32 * Crgtab = cconvert->Cr_g_tab; |
| 64 | register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| 65 | SHIFT_TEMPS |
| 66 | |
| 67 | while (--num_rows >= 0) { |
| 68 | INT32 rgb; |
| 69 | unsigned int r, g, b; |
| 70 | inptr0 = input_buf[0][input_row]; |
| 71 | inptr1 = input_buf[1][input_row]; |
| 72 | inptr2 = input_buf[2][input_row]; |
| 73 | input_row++; |
| 74 | outptr = *output_buf++; |
| 75 | |
| 76 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 77 | y = GETJSAMPLE(*inptr0++); |
| 78 | cb = GETJSAMPLE(*inptr1++); |
| 79 | cr = GETJSAMPLE(*inptr2++); |
| 80 | r = range_limit[y + Crrtab[cr]]; |
| 81 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 82 | SCALEBITS))]; |
| 83 | b = range_limit[y + Cbbtab[cb]]; |
| 84 | rgb = PACK_SHORT_565(r, g, b); |
| 85 | *(INT16*)outptr = rgb; |
| 86 | outptr += 2; |
| 87 | num_cols--; |
| 88 | } |
| 89 | for (col = 0; col < (num_cols >> 1); col++) { |
| 90 | y = GETJSAMPLE(*inptr0++); |
| 91 | cb = GETJSAMPLE(*inptr1++); |
| 92 | cr = GETJSAMPLE(*inptr2++); |
| 93 | r = range_limit[y + Crrtab[cr]]; |
| 94 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 95 | SCALEBITS))]; |
| 96 | b = range_limit[y + Cbbtab[cb]]; |
| 97 | rgb = PACK_SHORT_565(r, g, b); |
| 98 | |
| 99 | y = GETJSAMPLE(*inptr0++); |
| 100 | cb = GETJSAMPLE(*inptr1++); |
| 101 | cr = GETJSAMPLE(*inptr2++); |
| 102 | r = range_limit[y + Crrtab[cr]]; |
| 103 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 104 | SCALEBITS))]; |
| 105 | b = range_limit[y + Cbbtab[cb]]; |
| 106 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 107 | |
| 108 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 109 | outptr += 4; |
| 110 | } |
| 111 | if (num_cols & 1) { |
| 112 | y = GETJSAMPLE(*inptr0); |
| 113 | cb = GETJSAMPLE(*inptr1); |
| 114 | cr = GETJSAMPLE(*inptr2); |
| 115 | r = range_limit[y + Crrtab[cr]]; |
| 116 | g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 117 | SCALEBITS))]; |
| 118 | b = range_limit[y + Cbbtab[cb]]; |
| 119 | rgb = PACK_SHORT_565(r, g, b); |
| 120 | *(INT16*)outptr = rgb; |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | |
| 126 | METHODDEF(void) |
| 127 | ycc_rgb565D_convert (j_decompress_ptr cinfo, |
| 128 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 129 | JSAMPARRAY output_buf, int num_rows) |
| 130 | { |
| 131 | my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| 132 | register int y, cb, cr; |
| 133 | register JSAMPROW outptr; |
| 134 | register JSAMPROW inptr0, inptr1, inptr2; |
| 135 | register JDIMENSION col; |
| 136 | JDIMENSION num_cols = cinfo->output_width; |
| 137 | /* copy these pointers into registers if possible */ |
| 138 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 139 | register int * Crrtab = cconvert->Cr_r_tab; |
| 140 | register int * Cbbtab = cconvert->Cb_b_tab; |
| 141 | register INT32 * Crgtab = cconvert->Cr_g_tab; |
| 142 | register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| 143 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 144 | SHIFT_TEMPS |
| 145 | |
| 146 | while (--num_rows >= 0) { |
| 147 | INT32 rgb; |
| 148 | unsigned int r, g, b; |
| 149 | |
| 150 | inptr0 = input_buf[0][input_row]; |
| 151 | inptr1 = input_buf[1][input_row]; |
| 152 | inptr2 = input_buf[2][input_row]; |
| 153 | input_row++; |
| 154 | outptr = *output_buf++; |
| 155 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 156 | y = GETJSAMPLE(*inptr0++); |
| 157 | cb = GETJSAMPLE(*inptr1++); |
| 158 | cr = GETJSAMPLE(*inptr2++); |
| 159 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 160 | g = range_limit[DITHER_565_G(y + |
| 161 | ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 162 | SCALEBITS)), d0)]; |
| 163 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 164 | rgb = PACK_SHORT_565(r, g, b); |
| 165 | *(INT16*)outptr = rgb; |
| 166 | outptr += 2; |
| 167 | num_cols--; |
| 168 | } |
| 169 | for (col = 0; col < (num_cols >> 1); col++) { |
| 170 | y = GETJSAMPLE(*inptr0++); |
| 171 | cb = GETJSAMPLE(*inptr1++); |
| 172 | cr = GETJSAMPLE(*inptr2++); |
| 173 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 174 | g = range_limit[DITHER_565_G(y + |
| 175 | ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 176 | SCALEBITS)), d0)]; |
| 177 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 178 | d0 = DITHER_ROTATE(d0); |
| 179 | rgb = PACK_SHORT_565(r, g, b); |
| 180 | |
| 181 | y = GETJSAMPLE(*inptr0++); |
| 182 | cb = GETJSAMPLE(*inptr1++); |
| 183 | cr = GETJSAMPLE(*inptr2++); |
| 184 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 185 | g = range_limit[DITHER_565_G(y + |
| 186 | ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 187 | SCALEBITS)), d0)]; |
| 188 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 189 | d0 = DITHER_ROTATE(d0); |
| 190 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 191 | |
| 192 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 193 | outptr += 4; |
| 194 | } |
| 195 | if (num_cols & 1) { |
| 196 | y = GETJSAMPLE(*inptr0); |
| 197 | cb = GETJSAMPLE(*inptr1); |
| 198 | cr = GETJSAMPLE(*inptr2); |
| 199 | r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)]; |
| 200 | g = range_limit[DITHER_565_G(y + |
| 201 | ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| 202 | SCALEBITS)), d0)]; |
| 203 | b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)]; |
| 204 | rgb = PACK_SHORT_565(r, g, b); |
| 205 | *(INT16*)outptr = rgb; |
| 206 | } |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | |
| 211 | METHODDEF(void) |
| 212 | rgb_rgb565_convert (j_decompress_ptr cinfo, |
| 213 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 214 | JSAMPARRAY output_buf, int num_rows) |
| 215 | { |
| 216 | register JSAMPROW outptr; |
| 217 | register JSAMPROW inptr0, inptr1, inptr2; |
| 218 | register JDIMENSION col; |
| 219 | JDIMENSION num_cols = cinfo->output_width; |
| 220 | SHIFT_TEMPS |
| 221 | |
| 222 | while (--num_rows >= 0) { |
| 223 | INT32 rgb; |
| 224 | unsigned int r, g, b; |
| 225 | |
| 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 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 232 | r = GETJSAMPLE(*inptr0++); |
| 233 | g = GETJSAMPLE(*inptr1++); |
| 234 | b = GETJSAMPLE(*inptr2++); |
| 235 | rgb = PACK_SHORT_565(r, g, b); |
| 236 | *(INT16*)outptr = rgb; |
| 237 | outptr += 2; |
| 238 | num_cols--; |
| 239 | } |
| 240 | for (col = 0; col < (num_cols >> 1); col++) { |
| 241 | r = GETJSAMPLE(*inptr0++); |
| 242 | g = GETJSAMPLE(*inptr1++); |
| 243 | b = GETJSAMPLE(*inptr2++); |
| 244 | rgb = PACK_SHORT_565(r, g, b); |
| 245 | |
| 246 | r = GETJSAMPLE(*inptr0++); |
| 247 | g = GETJSAMPLE(*inptr1++); |
| 248 | b = GETJSAMPLE(*inptr2++); |
| 249 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 250 | |
| 251 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 252 | outptr += 4; |
| 253 | } |
| 254 | if (num_cols & 1) { |
| 255 | r = GETJSAMPLE(*inptr0); |
| 256 | g = GETJSAMPLE(*inptr1); |
| 257 | b = GETJSAMPLE(*inptr2); |
| 258 | rgb = PACK_SHORT_565(r, g, b); |
| 259 | *(INT16*)outptr = rgb; |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | |
| 265 | METHODDEF(void) |
| 266 | rgb_rgb565D_convert (j_decompress_ptr cinfo, |
| 267 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 268 | JSAMPARRAY output_buf, int num_rows) |
| 269 | { |
| 270 | register JSAMPROW outptr; |
| 271 | register JSAMPROW inptr0, inptr1, inptr2; |
| 272 | register JDIMENSION col; |
| 273 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 274 | JDIMENSION num_cols = cinfo->output_width; |
| 275 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 276 | SHIFT_TEMPS |
| 277 | |
| 278 | while (--num_rows >= 0) { |
| 279 | INT32 rgb; |
| 280 | unsigned int r, g, b; |
| 281 | |
| 282 | inptr0 = input_buf[0][input_row]; |
| 283 | inptr1 = input_buf[1][input_row]; |
| 284 | inptr2 = input_buf[2][input_row]; |
| 285 | input_row++; |
| 286 | outptr = *output_buf++; |
| 287 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 288 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)]; |
| 289 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)]; |
| 290 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)]; |
| 291 | rgb = PACK_SHORT_565(r, g, b); |
| 292 | *(INT16*)outptr = rgb; |
| 293 | outptr += 2; |
| 294 | num_cols--; |
| 295 | } |
| 296 | for (col = 0; col < (num_cols >> 1); col++) { |
| 297 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)]; |
| 298 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)]; |
| 299 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)]; |
| 300 | d0 = DITHER_ROTATE(d0); |
| 301 | rgb = PACK_SHORT_565(r, g, b); |
| 302 | |
| 303 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0++), d0)]; |
| 304 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1++), d0)]; |
| 305 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2++), d0)]; |
| 306 | d0 = DITHER_ROTATE(d0); |
| 307 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b)); |
| 308 | |
| 309 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 310 | outptr += 4; |
| 311 | } |
| 312 | if (num_cols & 1) { |
| 313 | r = range_limit[DITHER_565_R(GETJSAMPLE(*inptr0), d0)]; |
| 314 | g = range_limit[DITHER_565_G(GETJSAMPLE(*inptr1), d0)]; |
| 315 | b = range_limit[DITHER_565_B(GETJSAMPLE(*inptr2), d0)]; |
| 316 | rgb = PACK_SHORT_565(r, g, b); |
| 317 | *(INT16*)outptr = rgb; |
| 318 | } |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | |
| 323 | METHODDEF(void) |
| 324 | gray_rgb565_convert (j_decompress_ptr cinfo, |
| 325 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 326 | JSAMPARRAY output_buf, int num_rows) |
| 327 | { |
| 328 | register JSAMPROW inptr, outptr; |
| 329 | register JDIMENSION col; |
| 330 | JDIMENSION num_cols = cinfo->output_width; |
| 331 | |
| 332 | while (--num_rows >= 0) { |
| 333 | INT32 rgb; |
| 334 | unsigned int g; |
| 335 | |
| 336 | inptr = input_buf[0][input_row++]; |
| 337 | outptr = *output_buf++; |
| 338 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 339 | g = *inptr++; |
| 340 | rgb = PACK_SHORT_565(g, g, g); |
| 341 | *(INT16*)outptr = rgb; |
| 342 | outptr += 2; |
| 343 | num_cols--; |
| 344 | } |
| 345 | for (col = 0; col < (num_cols >> 1); col++) { |
| 346 | g = *inptr++; |
| 347 | rgb = PACK_SHORT_565(g, g, g); |
| 348 | g = *inptr++; |
| 349 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g)); |
| 350 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 351 | outptr += 4; |
| 352 | } |
| 353 | if (num_cols & 1) { |
| 354 | g = *inptr; |
| 355 | rgb = PACK_SHORT_565(g, g, g); |
| 356 | *(INT16*)outptr = rgb; |
| 357 | } |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | |
| 362 | METHODDEF(void) |
| 363 | gray_rgb565D_convert (j_decompress_ptr cinfo, |
| 364 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
| 365 | JSAMPARRAY output_buf, int num_rows) |
| 366 | { |
| 367 | register JSAMPROW inptr, outptr; |
| 368 | register JDIMENSION col; |
| 369 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 370 | JDIMENSION num_cols = cinfo->output_width; |
| 371 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 372 | |
| 373 | while (--num_rows >= 0) { |
| 374 | INT32 rgb; |
| 375 | unsigned int g; |
| 376 | |
| 377 | inptr = input_buf[0][input_row++]; |
| 378 | outptr = *output_buf++; |
| 379 | if (PACK_NEED_ALIGNMENT(outptr)) { |
| 380 | g = *inptr++; |
| 381 | g = range_limit[DITHER_565_R(g, d0)]; |
| 382 | rgb = PACK_SHORT_565(g, g, g); |
| 383 | *(INT16*)outptr = rgb; |
| 384 | outptr += 2; |
| 385 | num_cols--; |
| 386 | } |
| 387 | for (col = 0; col < (num_cols >> 1); col++) { |
| 388 | g = *inptr++; |
| 389 | g = range_limit[DITHER_565_R(g, d0)]; |
| 390 | rgb = PACK_SHORT_565(g, g, g); |
| 391 | d0 = DITHER_ROTATE(d0); |
| 392 | |
| 393 | g = *inptr++; |
| 394 | g = range_limit[DITHER_565_R(g, d0)]; |
| 395 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g)); |
| 396 | d0 = DITHER_ROTATE(d0); |
| 397 | |
| 398 | WRITE_TWO_ALIGNED_PIXELS(outptr, rgb); |
| 399 | outptr += 4; |
| 400 | } |
| 401 | if (num_cols & 1) { |
| 402 | g = *inptr; |
| 403 | g = range_limit[DITHER_565_R(g, d0)]; |
| 404 | rgb = PACK_SHORT_565(g, g, g); |
| 405 | *(INT16*)outptr = rgb; |
| 406 | } |
| 407 | } |
| 408 | } |