The Android Open Source Project | 9f5d49a | 2009-03-03 19:30:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * jdmerge.c |
| 3 | * |
| 4 | * Copyright (C) 1994-1996, 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 code for merged upsampling/color conversion. |
| 9 | * |
| 10 | * This file combines functions from jdsample.c and jdcolor.c; |
| 11 | * read those files first to understand what's going on. |
| 12 | * |
| 13 | * When the chroma components are to be upsampled by simple replication |
| 14 | * (ie, box filtering), we can save some work in color conversion by |
| 15 | * calculating all the output pixels corresponding to a pair of chroma |
| 16 | * samples at one time. In the conversion equations |
| 17 | * R = Y + K1 * Cr |
| 18 | * G = Y + K2 * Cb + K3 * Cr |
| 19 | * B = Y + K4 * Cb |
| 20 | * only the Y term varies among the group of pixels corresponding to a pair |
| 21 | * of chroma samples, so the rest of the terms can be calculated just once. |
| 22 | * At typical sampling ratios, this eliminates half or three-quarters of the |
| 23 | * multiplications needed for color conversion. |
| 24 | * |
| 25 | * This file currently provides implementations for the following cases: |
| 26 | * YCbCr => RGB color conversion only. |
| 27 | * Sampling ratios of 2h1v or 2h2v. |
| 28 | * No scaling needed at upsample time. |
| 29 | * Corner-aligned (non-CCIR601) sampling alignment. |
| 30 | * Other special cases could be added, but in most applications these are |
| 31 | * the only common cases. (For uncommon cases we fall back on the more |
| 32 | * general code in jdsample.c and jdcolor.c.) |
| 33 | */ |
| 34 | |
| 35 | #define JPEG_INTERNALS |
| 36 | #include "jinclude.h" |
| 37 | #include "jpeglib.h" |
| 38 | |
| 39 | #ifdef UPSAMPLE_MERGING_SUPPORTED |
| 40 | |
| 41 | #ifdef ANDROID_RGB |
| 42 | |
| 43 | /* Declarations for ordered dithering. |
| 44 | * |
| 45 | * We use 4x4 ordered dither array packed into 32 bits. This array is |
| 46 | * sufficent for dithering RGB_888 to RGB_565. |
| 47 | */ |
| 48 | |
| 49 | #define DITHER_MASK 0x3 |
| 50 | #define DITHER_ROTATE(x) (((x)<<24) | (((x)>>8)&0x00FFFFFF)) |
| 51 | static const INT32 dither_matrix[4] = { |
| 52 | 0x0008020A, |
| 53 | 0x0C040E06, |
| 54 | 0x030B0109, |
| 55 | 0x0F070D05 |
| 56 | }; |
| 57 | |
| 58 | #endif |
| 59 | |
| 60 | /* Private subobject */ |
| 61 | |
| 62 | typedef struct { |
| 63 | struct jpeg_upsampler pub; /* public fields */ |
| 64 | |
| 65 | /* Pointer to routine to do actual upsampling/conversion of one row group */ |
| 66 | JMETHOD(void, upmethod, (j_decompress_ptr cinfo, |
| 67 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 68 | JSAMPARRAY output_buf)); |
| 69 | |
| 70 | /* Private state for YCC->RGB conversion */ |
| 71 | int * Cr_r_tab; /* => table for Cr to R conversion */ |
| 72 | int * Cb_b_tab; /* => table for Cb to B conversion */ |
| 73 | INT32 * Cr_g_tab; /* => table for Cr to G conversion */ |
| 74 | INT32 * Cb_g_tab; /* => table for Cb to G conversion */ |
| 75 | |
| 76 | /* For 2:1 vertical sampling, we produce two output rows at a time. |
| 77 | * We need a "spare" row buffer to hold the second output row if the |
| 78 | * application provides just a one-row buffer; we also use the spare |
| 79 | * to discard the dummy last row if the image height is odd. |
| 80 | */ |
| 81 | JSAMPROW spare_row; |
| 82 | boolean spare_full; /* T if spare buffer is occupied */ |
| 83 | |
| 84 | JDIMENSION out_row_width; /* samples per output row */ |
| 85 | JDIMENSION rows_to_go; /* counts rows remaining in image */ |
| 86 | } my_upsampler; |
| 87 | |
| 88 | typedef my_upsampler * my_upsample_ptr; |
| 89 | |
| 90 | #define SCALEBITS 16 /* speediest right-shift on some machines */ |
| 91 | #define ONE_HALF ((INT32) 1 << (SCALEBITS-1)) |
| 92 | #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5)) |
| 93 | |
| 94 | |
| 95 | /* |
| 96 | * Initialize tables for YCC->RGB colorspace conversion. |
| 97 | * This is taken directly from jdcolor.c; see that file for more info. |
| 98 | */ |
| 99 | |
| 100 | LOCAL(void) |
| 101 | build_ycc_rgb_table (j_decompress_ptr cinfo) |
| 102 | { |
| 103 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 104 | int i; |
| 105 | INT32 x; |
| 106 | SHIFT_TEMPS |
| 107 | |
| 108 | upsample->Cr_r_tab = (int *) |
| 109 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 110 | (MAXJSAMPLE+1) * SIZEOF(int)); |
| 111 | upsample->Cb_b_tab = (int *) |
| 112 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 113 | (MAXJSAMPLE+1) * SIZEOF(int)); |
| 114 | upsample->Cr_g_tab = (INT32 *) |
| 115 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 116 | (MAXJSAMPLE+1) * SIZEOF(INT32)); |
| 117 | upsample->Cb_g_tab = (INT32 *) |
| 118 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 119 | (MAXJSAMPLE+1) * SIZEOF(INT32)); |
| 120 | |
| 121 | for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
| 122 | /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
| 123 | /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
| 124 | /* Cr=>R value is nearest int to 1.40200 * x */ |
| 125 | upsample->Cr_r_tab[i] = (int) |
| 126 | RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS); |
| 127 | /* Cb=>B value is nearest int to 1.77200 * x */ |
| 128 | upsample->Cb_b_tab[i] = (int) |
| 129 | RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS); |
| 130 | /* Cr=>G value is scaled-up -0.71414 * x */ |
| 131 | upsample->Cr_g_tab[i] = (- FIX(0.71414)) * x; |
| 132 | /* Cb=>G value is scaled-up -0.34414 * x */ |
| 133 | /* We also add in ONE_HALF so that need not do it in inner loop */ |
| 134 | upsample->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | |
| 139 | /* |
| 140 | * Initialize for an upsampling pass. |
| 141 | */ |
| 142 | |
| 143 | METHODDEF(void) |
| 144 | start_pass_merged_upsample (j_decompress_ptr cinfo) |
| 145 | { |
| 146 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 147 | |
| 148 | /* Mark the spare buffer empty */ |
| 149 | upsample->spare_full = FALSE; |
| 150 | /* Initialize total-height counter for detecting bottom of image */ |
| 151 | upsample->rows_to_go = cinfo->output_height; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | /* |
| 156 | * Control routine to do upsampling (and color conversion). |
| 157 | * |
| 158 | * The control routine just handles the row buffering considerations. |
| 159 | */ |
| 160 | |
| 161 | METHODDEF(void) |
| 162 | merged_2v_upsample (j_decompress_ptr cinfo, |
| 163 | JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr, |
| 164 | JDIMENSION in_row_groups_avail, |
| 165 | JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, |
| 166 | JDIMENSION out_rows_avail) |
| 167 | /* 2:1 vertical sampling case: may need a spare row. */ |
| 168 | { |
| 169 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 170 | JSAMPROW work_ptrs[2]; |
| 171 | JDIMENSION num_rows; /* number of rows returned to caller */ |
| 172 | |
| 173 | if (upsample->spare_full) { |
| 174 | /* If we have a spare row saved from a previous cycle, just return it. */ |
| 175 | JDIMENSION size = upsample->out_row_width; |
| 176 | #ifdef ANDROID_RGB |
| 177 | if (cinfo->out_color_space == JCS_RGB_565) |
| 178 | size = cinfo->output_width*2; |
| 179 | #endif |
| 180 | jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0, |
| 181 | 1, size); |
| 182 | |
| 183 | num_rows = 1; |
| 184 | upsample->spare_full = FALSE; |
| 185 | } else { |
| 186 | /* Figure number of rows to return to caller. */ |
| 187 | num_rows = 2; |
| 188 | /* Not more than the distance to the end of the image. */ |
| 189 | if (num_rows > upsample->rows_to_go) |
| 190 | num_rows = upsample->rows_to_go; |
| 191 | /* And not more than what the client can accept: */ |
| 192 | out_rows_avail -= *out_row_ctr; |
| 193 | if (num_rows > out_rows_avail) |
| 194 | num_rows = out_rows_avail; |
| 195 | /* Create output pointer array for upsampler. */ |
| 196 | work_ptrs[0] = output_buf[*out_row_ctr]; |
| 197 | if (num_rows > 1) { |
| 198 | work_ptrs[1] = output_buf[*out_row_ctr + 1]; |
| 199 | } else { |
| 200 | work_ptrs[1] = upsample->spare_row; |
| 201 | upsample->spare_full = TRUE; |
| 202 | } |
| 203 | /* Now do the upsampling. */ |
| 204 | (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs); |
| 205 | } |
| 206 | |
| 207 | /* Adjust counts */ |
| 208 | *out_row_ctr += num_rows; |
| 209 | upsample->rows_to_go -= num_rows; |
| 210 | /* When the buffer is emptied, declare this input row group consumed */ |
| 211 | if (! upsample->spare_full) |
| 212 | (*in_row_group_ctr)++; |
| 213 | } |
| 214 | |
| 215 | |
| 216 | METHODDEF(void) |
| 217 | merged_1v_upsample (j_decompress_ptr cinfo, |
| 218 | JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr, |
| 219 | JDIMENSION in_row_groups_avail, |
| 220 | JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, |
| 221 | JDIMENSION out_rows_avail) |
| 222 | /* 1:1 vertical sampling case: much easier, never need a spare row. */ |
| 223 | { |
| 224 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 225 | |
| 226 | /* Just do the upsampling. */ |
| 227 | (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, |
| 228 | output_buf + *out_row_ctr); |
| 229 | /* Adjust counts */ |
| 230 | (*out_row_ctr)++; |
| 231 | (*in_row_group_ctr)++; |
| 232 | } |
| 233 | |
| 234 | |
| 235 | /* |
| 236 | * These are the routines invoked by the control routines to do |
| 237 | * the actual upsampling/conversion. One row group is processed per call. |
| 238 | * |
| 239 | * Note: since we may be writing directly into application-supplied buffers, |
| 240 | * we have to be honest about the output width; we can't assume the buffer |
| 241 | * has been rounded up to an even width. |
| 242 | */ |
| 243 | |
| 244 | |
| 245 | /* |
| 246 | * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical. |
| 247 | */ |
| 248 | |
| 249 | METHODDEF(void) |
| 250 | h2v1_merged_upsample (j_decompress_ptr cinfo, |
| 251 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 252 | JSAMPARRAY output_buf) |
| 253 | { |
| 254 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 255 | register int y, cred, cgreen, cblue; |
| 256 | int cb, cr; |
| 257 | register JSAMPROW outptr; |
| 258 | JSAMPROW inptr0, inptr1, inptr2; |
| 259 | JDIMENSION col; |
| 260 | /* copy these pointers into registers if possible */ |
| 261 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 262 | int * Crrtab = upsample->Cr_r_tab; |
| 263 | int * Cbbtab = upsample->Cb_b_tab; |
| 264 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 265 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 266 | SHIFT_TEMPS |
| 267 | |
| 268 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 269 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 270 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 271 | outptr = output_buf[0]; |
| 272 | /* Loop for each pair of output pixels */ |
| 273 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 274 | /* Do the chroma part of the calculation */ |
| 275 | cb = GETJSAMPLE(*inptr1++); |
| 276 | cr = GETJSAMPLE(*inptr2++); |
| 277 | cred = Crrtab[cr]; |
| 278 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 279 | cblue = Cbbtab[cb]; |
| 280 | /* Fetch 2 Y values and emit 2 pixels */ |
| 281 | y = GETJSAMPLE(*inptr0++); |
| 282 | outptr[RGB_RED] = range_limit[y + cred]; |
| 283 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 284 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| 285 | outptr += RGB_PIXELSIZE; |
| 286 | y = GETJSAMPLE(*inptr0++); |
| 287 | outptr[RGB_RED] = range_limit[y + cred]; |
| 288 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 289 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| 290 | outptr += RGB_PIXELSIZE; |
| 291 | } |
| 292 | /* If image width is odd, do the last output column separately */ |
| 293 | if (cinfo->output_width & 1) { |
| 294 | cb = GETJSAMPLE(*inptr1); |
| 295 | cr = GETJSAMPLE(*inptr2); |
| 296 | cred = Crrtab[cr]; |
| 297 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 298 | cblue = Cbbtab[cb]; |
| 299 | y = GETJSAMPLE(*inptr0); |
| 300 | outptr[RGB_RED] = range_limit[y + cred]; |
| 301 | outptr[RGB_GREEN] = range_limit[y + cgreen]; |
| 302 | outptr[RGB_BLUE] = range_limit[y + cblue]; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | |
| 307 | #ifdef ANDROID_RGB |
| 308 | METHODDEF(void) |
| 309 | h2v1_merged_upsample_565 (j_decompress_ptr cinfo, |
| 310 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 311 | JSAMPARRAY output_buf) |
| 312 | { |
| 313 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 314 | register int y, cred, cgreen, cblue; |
| 315 | int cb, cr; |
| 316 | register JSAMPROW outptr; |
| 317 | JSAMPROW inptr0, inptr1, inptr2; |
| 318 | JDIMENSION col; |
| 319 | /* copy these pointers into registers if possible */ |
| 320 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 321 | int * Crrtab = upsample->Cr_r_tab; |
| 322 | int * Cbbtab = upsample->Cb_b_tab; |
| 323 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 324 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 325 | unsigned int r, g, b; |
| 326 | INT32 rgb; |
| 327 | SHIFT_TEMPS |
| 328 | |
| 329 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 330 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 331 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 332 | outptr = output_buf[0]; |
| 333 | /* Loop for each pair of output pixels */ |
| 334 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 335 | /* Do the chroma part of the calculation */ |
| 336 | cb = GETJSAMPLE(*inptr1++); |
| 337 | cr = GETJSAMPLE(*inptr2++); |
| 338 | cred = Crrtab[cr]; |
| 339 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 340 | cblue = Cbbtab[cb]; |
| 341 | /* Fetch 2 Y values and emit 2 pixels */ |
| 342 | y = GETJSAMPLE(*inptr0++); |
| 343 | r = range_limit[y + cred]; |
| 344 | g = range_limit[y + cgreen]; |
| 345 | b = range_limit[y + cblue]; |
| 346 | rgb = PACK_SHORT_565(r,g,b); |
| 347 | y = GETJSAMPLE(*inptr0++); |
| 348 | r = range_limit[y + cred]; |
| 349 | g = range_limit[y + cgreen]; |
| 350 | b = range_limit[y + cblue]; |
| 351 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 352 | WRITE_TWO_PIXELS(outptr, rgb); |
| 353 | outptr += 4; |
| 354 | } |
| 355 | /* If image width is odd, do the last output column separately */ |
| 356 | if (cinfo->output_width & 1) { |
| 357 | cb = GETJSAMPLE(*inptr1); |
| 358 | cr = GETJSAMPLE(*inptr2); |
| 359 | cred = Crrtab[cr]; |
| 360 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 361 | cblue = Cbbtab[cb]; |
| 362 | y = GETJSAMPLE(*inptr0); |
| 363 | r = range_limit[y + cred]; |
| 364 | g = range_limit[y + cgreen]; |
| 365 | b = range_limit[y + cblue]; |
| 366 | rgb = PACK_SHORT_565(r,g,b); |
| 367 | *(INT16*)outptr = rgb; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | |
| 372 | METHODDEF(void) |
| 373 | h2v1_merged_upsample_565D (j_decompress_ptr cinfo, |
| 374 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 375 | JSAMPARRAY output_buf) |
| 376 | { |
| 377 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 378 | register int y, cred, cgreen, cblue; |
| 379 | int cb, cr; |
| 380 | register JSAMPROW outptr; |
| 381 | JSAMPROW inptr0, inptr1, inptr2; |
| 382 | JDIMENSION col; |
| 383 | /* copy these pointers into registers if possible */ |
| 384 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 385 | int * Crrtab = upsample->Cr_r_tab; |
| 386 | int * Cbbtab = upsample->Cb_b_tab; |
| 387 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 388 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 389 | JDIMENSION col_index = 0; |
| 390 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 391 | unsigned int r, g, b; |
| 392 | INT32 rgb; |
| 393 | SHIFT_TEMPS |
| 394 | |
| 395 | inptr0 = input_buf[0][in_row_group_ctr]; |
| 396 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 397 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 398 | outptr = output_buf[0]; |
| 399 | /* Loop for each pair of output pixels */ |
| 400 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 401 | /* Do the chroma part of the calculation */ |
| 402 | cb = GETJSAMPLE(*inptr1++); |
| 403 | cr = GETJSAMPLE(*inptr2++); |
| 404 | cred = Crrtab[cr]; |
| 405 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 406 | cblue = Cbbtab[cb]; |
| 407 | /* Fetch 2 Y values and emit 2 pixels */ |
| 408 | y = GETJSAMPLE(*inptr0++); |
| 409 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 410 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 411 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 412 | d0 = DITHER_ROTATE(d0); |
| 413 | rgb = PACK_SHORT_565(r,g,b); |
| 414 | y = GETJSAMPLE(*inptr0++); |
| 415 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 416 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 417 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 418 | d0 = DITHER_ROTATE(d0); |
| 419 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 420 | WRITE_TWO_PIXELS(outptr, rgb); |
| 421 | outptr += 4; |
| 422 | } |
| 423 | /* If image width is odd, do the last output column separately */ |
| 424 | if (cinfo->output_width & 1) { |
| 425 | cb = GETJSAMPLE(*inptr1); |
| 426 | cr = GETJSAMPLE(*inptr2); |
| 427 | cred = Crrtab[cr]; |
| 428 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 429 | cblue = Cbbtab[cb]; |
| 430 | y = GETJSAMPLE(*inptr0); |
| 431 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 432 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 433 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 434 | rgb = PACK_SHORT_565(r,g,b); |
| 435 | *(INT16*)outptr = rgb; |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | |
| 440 | #endif |
| 441 | |
| 442 | /* |
| 443 | * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical. |
| 444 | */ |
| 445 | |
| 446 | METHODDEF(void) |
| 447 | h2v2_merged_upsample (j_decompress_ptr cinfo, |
| 448 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 449 | JSAMPARRAY output_buf) |
| 450 | { |
| 451 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 452 | register int y, cred, cgreen, cblue; |
| 453 | int cb, cr; |
| 454 | register JSAMPROW outptr0, outptr1; |
| 455 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 456 | JDIMENSION col; |
| 457 | /* copy these pointers into registers if possible */ |
| 458 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 459 | int * Crrtab = upsample->Cr_r_tab; |
| 460 | int * Cbbtab = upsample->Cb_b_tab; |
| 461 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 462 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 463 | SHIFT_TEMPS |
| 464 | |
| 465 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| 466 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| 467 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 468 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 469 | outptr0 = output_buf[0]; |
| 470 | outptr1 = output_buf[1]; |
| 471 | /* Loop for each group of output pixels */ |
| 472 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 473 | /* Do the chroma part of the calculation */ |
| 474 | cb = GETJSAMPLE(*inptr1++); |
| 475 | cr = GETJSAMPLE(*inptr2++); |
| 476 | cred = Crrtab[cr]; |
| 477 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 478 | cblue = Cbbtab[cb]; |
| 479 | /* Fetch 4 Y values and emit 4 pixels */ |
| 480 | y = GETJSAMPLE(*inptr00++); |
| 481 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 482 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 483 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| 484 | outptr0 += RGB_PIXELSIZE; |
| 485 | y = GETJSAMPLE(*inptr00++); |
| 486 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 487 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 488 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| 489 | outptr0 += RGB_PIXELSIZE; |
| 490 | y = GETJSAMPLE(*inptr01++); |
| 491 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 492 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 493 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| 494 | outptr1 += RGB_PIXELSIZE; |
| 495 | y = GETJSAMPLE(*inptr01++); |
| 496 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 497 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 498 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| 499 | outptr1 += RGB_PIXELSIZE; |
| 500 | } |
| 501 | /* If image width is odd, do the last output column separately */ |
| 502 | if (cinfo->output_width & 1) { |
| 503 | cb = GETJSAMPLE(*inptr1); |
| 504 | cr = GETJSAMPLE(*inptr2); |
| 505 | cred = Crrtab[cr]; |
| 506 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 507 | cblue = Cbbtab[cb]; |
| 508 | y = GETJSAMPLE(*inptr00); |
| 509 | outptr0[RGB_RED] = range_limit[y + cred]; |
| 510 | outptr0[RGB_GREEN] = range_limit[y + cgreen]; |
| 511 | outptr0[RGB_BLUE] = range_limit[y + cblue]; |
| 512 | y = GETJSAMPLE(*inptr01); |
| 513 | outptr1[RGB_RED] = range_limit[y + cred]; |
| 514 | outptr1[RGB_GREEN] = range_limit[y + cgreen]; |
| 515 | outptr1[RGB_BLUE] = range_limit[y + cblue]; |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | |
| 520 | #ifdef ANDROID_RGB |
| 521 | |
| 522 | METHODDEF(void) |
| 523 | h2v2_merged_upsample_565 (j_decompress_ptr cinfo, |
| 524 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 525 | JSAMPARRAY output_buf) |
| 526 | { |
| 527 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 528 | register int y, cred, cgreen, cblue; |
| 529 | int cb, cr; |
| 530 | register JSAMPROW outptr0, outptr1; |
| 531 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 532 | JDIMENSION col; |
| 533 | /* copy these pointers into registers if possible */ |
| 534 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 535 | int * Crrtab = upsample->Cr_r_tab; |
| 536 | int * Cbbtab = upsample->Cb_b_tab; |
| 537 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 538 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 539 | unsigned int r, g, b; |
| 540 | INT32 rgb; |
| 541 | SHIFT_TEMPS |
| 542 | |
| 543 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| 544 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| 545 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 546 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 547 | outptr0 = output_buf[0]; |
| 548 | outptr1 = output_buf[1]; |
| 549 | /* Loop for each group of output pixels */ |
| 550 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 551 | /* Do the chroma part of the calculation */ |
| 552 | cb = GETJSAMPLE(*inptr1++); |
| 553 | cr = GETJSAMPLE(*inptr2++); |
| 554 | cred = Crrtab[cr]; |
| 555 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 556 | cblue = Cbbtab[cb]; |
| 557 | /* Fetch 4 Y values and emit 4 pixels */ |
| 558 | y = GETJSAMPLE(*inptr00++); |
| 559 | r = range_limit[y + cred]; |
| 560 | g = range_limit[y + cgreen]; |
| 561 | b = range_limit[y + cblue]; |
| 562 | rgb = PACK_SHORT_565(r,g,b); |
| 563 | y = GETJSAMPLE(*inptr00++); |
| 564 | r = range_limit[y + cred]; |
| 565 | g = range_limit[y + cgreen]; |
| 566 | b = range_limit[y + cblue]; |
| 567 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 568 | WRITE_TWO_PIXELS(outptr0, rgb); |
| 569 | outptr0 += 4; |
| 570 | y = GETJSAMPLE(*inptr01++); |
| 571 | r = range_limit[y + cred]; |
| 572 | g = range_limit[y + cgreen]; |
| 573 | b = range_limit[y + cblue]; |
| 574 | rgb = PACK_SHORT_565(r,g,b); |
| 575 | y = GETJSAMPLE(*inptr01++); |
| 576 | r = range_limit[y + cred]; |
| 577 | g = range_limit[y + cgreen]; |
| 578 | b = range_limit[y + cblue]; |
| 579 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 580 | WRITE_TWO_PIXELS(outptr1, rgb); |
| 581 | outptr1 += 4; |
| 582 | } |
| 583 | /* If image width is odd, do the last output column separately */ |
| 584 | if (cinfo->output_width & 1) { |
| 585 | cb = GETJSAMPLE(*inptr1); |
| 586 | cr = GETJSAMPLE(*inptr2); |
| 587 | cred = Crrtab[cr]; |
| 588 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 589 | cblue = Cbbtab[cb]; |
| 590 | y = GETJSAMPLE(*inptr00); |
| 591 | r = range_limit[y + cred]; |
| 592 | g = range_limit[y + cgreen]; |
| 593 | b = range_limit[y + cblue]; |
| 594 | rgb = PACK_SHORT_565(r,g,b); |
| 595 | *(INT16*)outptr0 = rgb; |
| 596 | y = GETJSAMPLE(*inptr01); |
| 597 | r = range_limit[y + cred]; |
| 598 | g = range_limit[y + cgreen]; |
| 599 | b = range_limit[y + cblue]; |
| 600 | rgb = PACK_SHORT_565(r,g,b); |
| 601 | *(INT16*)outptr1 = rgb; |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | |
| 606 | |
| 607 | METHODDEF(void) |
| 608 | h2v2_merged_upsample_565D (j_decompress_ptr cinfo, |
| 609 | JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr, |
| 610 | JSAMPARRAY output_buf) |
| 611 | { |
| 612 | my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample; |
| 613 | register int y, cred, cgreen, cblue; |
| 614 | int cb, cr; |
| 615 | register JSAMPROW outptr0, outptr1; |
| 616 | JSAMPROW inptr00, inptr01, inptr1, inptr2; |
| 617 | JDIMENSION col; |
| 618 | /* copy these pointers into registers if possible */ |
| 619 | register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| 620 | int * Crrtab = upsample->Cr_r_tab; |
| 621 | int * Cbbtab = upsample->Cb_b_tab; |
| 622 | INT32 * Crgtab = upsample->Cr_g_tab; |
| 623 | INT32 * Cbgtab = upsample->Cb_g_tab; |
| 624 | JDIMENSION col_index = 0; |
| 625 | INT32 d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK]; |
| 626 | INT32 d1 = dither_matrix[(cinfo->output_scanline+1) & DITHER_MASK]; |
| 627 | unsigned int r, g, b; |
| 628 | INT32 rgb; |
| 629 | SHIFT_TEMPS |
| 630 | |
| 631 | inptr00 = input_buf[0][in_row_group_ctr*2]; |
| 632 | inptr01 = input_buf[0][in_row_group_ctr*2 + 1]; |
| 633 | inptr1 = input_buf[1][in_row_group_ctr]; |
| 634 | inptr2 = input_buf[2][in_row_group_ctr]; |
| 635 | outptr0 = output_buf[0]; |
| 636 | outptr1 = output_buf[1]; |
| 637 | /* Loop for each group of output pixels */ |
| 638 | for (col = cinfo->output_width >> 1; col > 0; col--) { |
| 639 | |
| 640 | /* Do the chroma part of the calculation */ |
| 641 | cb = GETJSAMPLE(*inptr1++); |
| 642 | cr = GETJSAMPLE(*inptr2++); |
| 643 | cred = Crrtab[cr]; |
| 644 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 645 | cblue = Cbbtab[cb]; |
| 646 | /* Fetch 4 Y values and emit 4 pixels */ |
| 647 | y = GETJSAMPLE(*inptr00++); |
| 648 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 649 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 650 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 651 | d0 = DITHER_ROTATE(d0); |
| 652 | rgb = PACK_SHORT_565(r,g,b); |
| 653 | y = GETJSAMPLE(*inptr00++); |
| 654 | r = range_limit[DITHER_565_R(y + cred, d1)]; |
| 655 | g = range_limit[DITHER_565_G(y + cgreen, d1)]; |
| 656 | b = range_limit[DITHER_565_B(y + cblue, d1)]; |
| 657 | d1 = DITHER_ROTATE(d1); |
| 658 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 659 | WRITE_TWO_PIXELS(outptr0, rgb); |
| 660 | outptr0 += 4; |
| 661 | y = GETJSAMPLE(*inptr01++); |
| 662 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 663 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 664 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 665 | d0 = DITHER_ROTATE(d0); |
| 666 | rgb = PACK_SHORT_565(r,g,b); |
| 667 | y = GETJSAMPLE(*inptr01++); |
| 668 | r = range_limit[DITHER_565_R(y + cred, d1)]; |
| 669 | g = range_limit[DITHER_565_G(y + cgreen, d1)]; |
| 670 | b = range_limit[DITHER_565_B(y + cblue, d1)]; |
| 671 | d1 = DITHER_ROTATE(d1); |
| 672 | rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r,g,b)); |
| 673 | WRITE_TWO_PIXELS(outptr1, rgb); |
| 674 | outptr1 += 4; |
| 675 | } |
| 676 | /* If image width is odd, do the last output column separately */ |
| 677 | if (cinfo->output_width & 1) { |
| 678 | cb = GETJSAMPLE(*inptr1); |
| 679 | cr = GETJSAMPLE(*inptr2); |
| 680 | cred = Crrtab[cr]; |
| 681 | cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS); |
| 682 | cblue = Cbbtab[cb]; |
| 683 | y = GETJSAMPLE(*inptr00); |
| 684 | r = range_limit[DITHER_565_R(y + cred, d0)]; |
| 685 | g = range_limit[DITHER_565_G(y + cgreen, d0)]; |
| 686 | b = range_limit[DITHER_565_B(y + cblue, d0)]; |
| 687 | rgb = PACK_SHORT_565(r,g,b); |
| 688 | *(INT16*)outptr0 = rgb; |
| 689 | y = GETJSAMPLE(*inptr01); |
| 690 | r = range_limit[DITHER_565_R(y + cred, d1)]; |
| 691 | g = range_limit[DITHER_565_G(y + cgreen, d1)]; |
| 692 | b = range_limit[DITHER_565_B(y + cblue, d1)]; |
| 693 | rgb = PACK_SHORT_565(r,g,b); |
| 694 | *(INT16*)outptr1 = rgb; |
| 695 | } |
| 696 | } |
| 697 | |
| 698 | #endif |
| 699 | |
| 700 | /* |
| 701 | * Module initialization routine for merged upsampling/color conversion. |
| 702 | * |
| 703 | * NB: this is called under the conditions determined by use_merged_upsample() |
| 704 | * in jdmaster.c. That routine MUST correspond to the actual capabilities |
| 705 | * of this module; no safety checks are made here. |
| 706 | */ |
| 707 | |
| 708 | GLOBAL(void) |
| 709 | jinit_merged_upsampler (j_decompress_ptr cinfo) |
| 710 | { |
| 711 | my_upsample_ptr upsample; |
| 712 | |
| 713 | upsample = (my_upsample_ptr) |
| 714 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 715 | SIZEOF(my_upsampler)); |
| 716 | cinfo->upsample = (struct jpeg_upsampler *) upsample; |
| 717 | upsample->pub.start_pass = start_pass_merged_upsample; |
| 718 | upsample->pub.need_context_rows = FALSE; |
| 719 | |
| 720 | upsample->out_row_width = cinfo->output_width * cinfo->out_color_components; |
| 721 | |
| 722 | if (cinfo->max_v_samp_factor == 2) { |
| 723 | upsample->pub.upsample = merged_2v_upsample; |
| 724 | upsample->upmethod = h2v2_merged_upsample; |
| 725 | #ifdef ANDROID_RGB |
| 726 | if (cinfo->out_color_space == JCS_RGB_565) { |
| 727 | if (cinfo->dither_mode == JDITHER_NONE) { |
| 728 | upsample->upmethod = h2v2_merged_upsample_565; |
| 729 | } else { |
| 730 | upsample->upmethod = h2v2_merged_upsample_565D; |
| 731 | } |
| 732 | } |
| 733 | #endif |
| 734 | /* Allocate a spare row buffer */ |
| 735 | upsample->spare_row = (JSAMPROW) |
| 736 | (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| 737 | (size_t) (upsample->out_row_width * SIZEOF(JSAMPLE))); |
| 738 | } else { |
| 739 | upsample->pub.upsample = merged_1v_upsample; |
| 740 | upsample->upmethod = h2v1_merged_upsample; |
| 741 | #ifdef ANDROID_RGB |
| 742 | if (cinfo->out_color_space == JCS_RGB_565) { |
| 743 | if (cinfo->dither_mode == JDITHER_NONE) { |
| 744 | upsample->upmethod = h2v1_merged_upsample_565; |
| 745 | } else { |
| 746 | upsample->upmethod = h2v1_merged_upsample_565D; |
| 747 | } |
| 748 | } |
| 749 | #endif |
| 750 | /* No spare row needed */ |
| 751 | upsample->spare_row = NULL; |
| 752 | } |
| 753 | |
| 754 | build_ycc_rgb_table(cinfo); |
| 755 | } |
| 756 | |
| 757 | #endif /* UPSAMPLE_MERGING_SUPPORTED */ |