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annotate libs/libjpeg/jdmerge.c @ 2:334d17aed7de

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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nuclear@0 1 /*
nuclear@0 2 * jdmerge.c
nuclear@0 3 *
nuclear@0 4 * Copyright (C) 1994-1996, Thomas G. Lane.
nuclear@0 5 * This file is part of the Independent JPEG Group's software.
nuclear@0 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@0 7 *
nuclear@0 8 * This file contains code for merged upsampling/color conversion.
nuclear@0 9 *
nuclear@0 10 * This file combines functions from jdsample.c and jdcolor.c;
nuclear@0 11 * read those files first to understand what's going on.
nuclear@0 12 *
nuclear@0 13 * When the chroma components are to be upsampled by simple replication
nuclear@0 14 * (ie, box filtering), we can save some work in color conversion by
nuclear@0 15 * calculating all the output pixels corresponding to a pair of chroma
nuclear@0 16 * samples at one time. In the conversion equations
nuclear@0 17 * R = Y + K1 * Cr
nuclear@0 18 * G = Y + K2 * Cb + K3 * Cr
nuclear@0 19 * B = Y + K4 * Cb
nuclear@0 20 * only the Y term varies among the group of pixels corresponding to a pair
nuclear@0 21 * of chroma samples, so the rest of the terms can be calculated just once.
nuclear@0 22 * At typical sampling ratios, this eliminates half or three-quarters of the
nuclear@0 23 * multiplications needed for color conversion.
nuclear@0 24 *
nuclear@0 25 * This file currently provides implementations for the following cases:
nuclear@0 26 * YCbCr => RGB color conversion only.
nuclear@0 27 * Sampling ratios of 2h1v or 2h2v.
nuclear@0 28 * No scaling needed at upsample time.
nuclear@0 29 * Corner-aligned (non-CCIR601) sampling alignment.
nuclear@0 30 * Other special cases could be added, but in most applications these are
nuclear@0 31 * the only common cases. (For uncommon cases we fall back on the more
nuclear@0 32 * general code in jdsample.c and jdcolor.c.)
nuclear@0 33 */
nuclear@0 34
nuclear@0 35 #define JPEG_INTERNALS
nuclear@0 36 #include "jinclude.h"
nuclear@0 37 #include "jpeglib.h"
nuclear@0 38
nuclear@0 39 #ifdef UPSAMPLE_MERGING_SUPPORTED
nuclear@0 40
nuclear@0 41
nuclear@0 42 /* Private subobject */
nuclear@0 43
nuclear@0 44 typedef struct {
nuclear@0 45 struct jpeg_upsampler pub; /* public fields */
nuclear@0 46
nuclear@0 47 /* Pointer to routine to do actual upsampling/conversion of one row group */
nuclear@0 48 JMETHOD(void, upmethod, (j_decompress_ptr cinfo,
nuclear@0 49 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
nuclear@0 50 JSAMPARRAY output_buf));
nuclear@0 51
nuclear@0 52 /* Private state for YCC->RGB conversion */
nuclear@0 53 int * Cr_r_tab; /* => table for Cr to R conversion */
nuclear@0 54 int * Cb_b_tab; /* => table for Cb to B conversion */
nuclear@0 55 INT32 * Cr_g_tab; /* => table for Cr to G conversion */
nuclear@0 56 INT32 * Cb_g_tab; /* => table for Cb to G conversion */
nuclear@0 57
nuclear@0 58 /* For 2:1 vertical sampling, we produce two output rows at a time.
nuclear@0 59 * We need a "spare" row buffer to hold the second output row if the
nuclear@0 60 * application provides just a one-row buffer; we also use the spare
nuclear@0 61 * to discard the dummy last row if the image height is odd.
nuclear@0 62 */
nuclear@0 63 JSAMPROW spare_row;
nuclear@0 64 boolean spare_full; /* T if spare buffer is occupied */
nuclear@0 65
nuclear@0 66 JDIMENSION out_row_width; /* samples per output row */
nuclear@0 67 JDIMENSION rows_to_go; /* counts rows remaining in image */
nuclear@0 68 } my_upsampler;
nuclear@0 69
nuclear@0 70 typedef my_upsampler * my_upsample_ptr;
nuclear@0 71
nuclear@0 72 #define SCALEBITS 16 /* speediest right-shift on some machines */
nuclear@0 73 #define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
nuclear@0 74 #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
nuclear@0 75
nuclear@0 76
nuclear@0 77 /*
nuclear@0 78 * Initialize tables for YCC->RGB colorspace conversion.
nuclear@0 79 * This is taken directly from jdcolor.c; see that file for more info.
nuclear@0 80 */
nuclear@0 81
nuclear@0 82 LOCAL(void)
nuclear@0 83 build_ycc_rgb_table (j_decompress_ptr cinfo)
nuclear@0 84 {
nuclear@0 85 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@0 86 int i;
nuclear@0 87 INT32 x;
nuclear@0 88 SHIFT_TEMPS
nuclear@0 89
nuclear@0 90 upsample->Cr_r_tab = (int *)
nuclear@0 91 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@0 92 (MAXJSAMPLE+1) * SIZEOF(int));
nuclear@0 93 upsample->Cb_b_tab = (int *)
nuclear@0 94 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@0 95 (MAXJSAMPLE+1) * SIZEOF(int));
nuclear@0 96 upsample->Cr_g_tab = (INT32 *)
nuclear@0 97 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@0 98 (MAXJSAMPLE+1) * SIZEOF(INT32));
nuclear@0 99 upsample->Cb_g_tab = (INT32 *)
nuclear@0 100 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@0 101 (MAXJSAMPLE+1) * SIZEOF(INT32));
nuclear@0 102
nuclear@0 103 for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
nuclear@0 104 /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
nuclear@0 105 /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
nuclear@0 106 /* Cr=>R value is nearest int to 1.40200 * x */
nuclear@0 107 upsample->Cr_r_tab[i] = (int)
nuclear@0 108 RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
nuclear@0 109 /* Cb=>B value is nearest int to 1.77200 * x */
nuclear@0 110 upsample->Cb_b_tab[i] = (int)
nuclear@0 111 RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
nuclear@0 112 /* Cr=>G value is scaled-up -0.71414 * x */
nuclear@0 113 upsample->Cr_g_tab[i] = (- FIX(0.71414)) * x;
nuclear@0 114 /* Cb=>G value is scaled-up -0.34414 * x */
nuclear@0 115 /* We also add in ONE_HALF so that need not do it in inner loop */
nuclear@0 116 upsample->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
nuclear@0 117 }
nuclear@0 118 }
nuclear@0 119
nuclear@0 120
nuclear@0 121 /*
nuclear@0 122 * Initialize for an upsampling pass.
nuclear@0 123 */
nuclear@0 124
nuclear@0 125 METHODDEF(void)
nuclear@0 126 start_pass_merged_upsample (j_decompress_ptr cinfo)
nuclear@0 127 {
nuclear@0 128 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@0 129
nuclear@0 130 /* Mark the spare buffer empty */
nuclear@0 131 upsample->spare_full = FALSE;
nuclear@0 132 /* Initialize total-height counter for detecting bottom of image */
nuclear@0 133 upsample->rows_to_go = cinfo->output_height;
nuclear@0 134 }
nuclear@0 135
nuclear@0 136
nuclear@0 137 /*
nuclear@0 138 * Control routine to do upsampling (and color conversion).
nuclear@0 139 *
nuclear@0 140 * The control routine just handles the row buffering considerations.
nuclear@0 141 */
nuclear@0 142
nuclear@0 143 METHODDEF(void)
nuclear@0 144 merged_2v_upsample (j_decompress_ptr cinfo,
nuclear@0 145 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@0 146 JDIMENSION in_row_groups_avail,
nuclear@0 147 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@0 148 JDIMENSION out_rows_avail)
nuclear@0 149 /* 2:1 vertical sampling case: may need a spare row. */
nuclear@0 150 {
nuclear@0 151 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@0 152 JSAMPROW work_ptrs[2];
nuclear@0 153 JDIMENSION num_rows; /* number of rows returned to caller */
nuclear@0 154
nuclear@0 155 if (upsample->spare_full) {
nuclear@0 156 /* If we have a spare row saved from a previous cycle, just return it. */
nuclear@0 157 jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0,
nuclear@0 158 1, upsample->out_row_width);
nuclear@0 159 num_rows = 1;
nuclear@0 160 upsample->spare_full = FALSE;
nuclear@0 161 } else {
nuclear@0 162 /* Figure number of rows to return to caller. */
nuclear@0 163 num_rows = 2;
nuclear@0 164 /* Not more than the distance to the end of the image. */
nuclear@0 165 if (num_rows > upsample->rows_to_go)
nuclear@0 166 num_rows = upsample->rows_to_go;
nuclear@0 167 /* And not more than what the client can accept: */
nuclear@0 168 out_rows_avail -= *out_row_ctr;
nuclear@0 169 if (num_rows > out_rows_avail)
nuclear@0 170 num_rows = out_rows_avail;
nuclear@0 171 /* Create output pointer array for upsampler. */
nuclear@0 172 work_ptrs[0] = output_buf[*out_row_ctr];
nuclear@0 173 if (num_rows > 1) {
nuclear@0 174 work_ptrs[1] = output_buf[*out_row_ctr + 1];
nuclear@0 175 } else {
nuclear@0 176 work_ptrs[1] = upsample->spare_row;
nuclear@0 177 upsample->spare_full = TRUE;
nuclear@0 178 }
nuclear@0 179 /* Now do the upsampling. */
nuclear@0 180 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
nuclear@0 181 }
nuclear@0 182
nuclear@0 183 /* Adjust counts */
nuclear@0 184 *out_row_ctr += num_rows;
nuclear@0 185 upsample->rows_to_go -= num_rows;
nuclear@0 186 /* When the buffer is emptied, declare this input row group consumed */
nuclear@0 187 if (! upsample->spare_full)
nuclear@0 188 (*in_row_group_ctr)++;
nuclear@0 189 }
nuclear@0 190
nuclear@0 191
nuclear@0 192 METHODDEF(void)
nuclear@0 193 merged_1v_upsample (j_decompress_ptr cinfo,
nuclear@0 194 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@0 195 JDIMENSION in_row_groups_avail,
nuclear@0 196 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@0 197 JDIMENSION out_rows_avail)
nuclear@0 198 /* 1:1 vertical sampling case: much easier, never need a spare row. */
nuclear@0 199 {
nuclear@0 200 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@0 201
nuclear@0 202 /* Just do the upsampling. */
nuclear@0 203 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
nuclear@0 204 output_buf + *out_row_ctr);
nuclear@0 205 /* Adjust counts */
nuclear@0 206 (*out_row_ctr)++;
nuclear@0 207 (*in_row_group_ctr)++;
nuclear@0 208 }
nuclear@0 209
nuclear@0 210
nuclear@0 211 /*
nuclear@0 212 * These are the routines invoked by the control routines to do
nuclear@0 213 * the actual upsampling/conversion. One row group is processed per call.
nuclear@0 214 *
nuclear@0 215 * Note: since we may be writing directly into application-supplied buffers,
nuclear@0 216 * we have to be honest about the output width; we can't assume the buffer
nuclear@0 217 * has been rounded up to an even width.
nuclear@0 218 */
nuclear@0 219
nuclear@0 220
nuclear@0 221 /*
nuclear@0 222 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
nuclear@0 223 */
nuclear@0 224
nuclear@0 225 METHODDEF(void)
nuclear@0 226 h2v1_merged_upsample (j_decompress_ptr cinfo,
nuclear@0 227 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
nuclear@0 228 JSAMPARRAY output_buf)
nuclear@0 229 {
nuclear@0 230 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@0 231 register int y, cred, cgreen, cblue;
nuclear@0 232 int cb, cr;
nuclear@0 233 register JSAMPROW outptr;
nuclear@0 234 JSAMPROW inptr0, inptr1, inptr2;
nuclear@0 235 JDIMENSION col;
nuclear@0 236 /* copy these pointers into registers if possible */
nuclear@0 237 register JSAMPLE * range_limit = cinfo->sample_range_limit;
nuclear@0 238 int * Crrtab = upsample->Cr_r_tab;
nuclear@0 239 int * Cbbtab = upsample->Cb_b_tab;
nuclear@0 240 INT32 * Crgtab = upsample->Cr_g_tab;
nuclear@0 241 INT32 * Cbgtab = upsample->Cb_g_tab;
nuclear@0 242 SHIFT_TEMPS
nuclear@0 243
nuclear@0 244 inptr0 = input_buf[0][in_row_group_ctr];
nuclear@0 245 inptr1 = input_buf[1][in_row_group_ctr];
nuclear@0 246 inptr2 = input_buf[2][in_row_group_ctr];
nuclear@0 247 outptr = output_buf[0];
nuclear@0 248 /* Loop for each pair of output pixels */
nuclear@0 249 for (col = cinfo->output_width >> 1; col > 0; col--) {
nuclear@0 250 /* Do the chroma part of the calculation */
nuclear@0 251 cb = GETJSAMPLE(*inptr1++);
nuclear@0 252 cr = GETJSAMPLE(*inptr2++);
nuclear@0 253 cred = Crrtab[cr];
nuclear@0 254 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@0 255 cblue = Cbbtab[cb];
nuclear@0 256 /* Fetch 2 Y values and emit 2 pixels */
nuclear@0 257 y = GETJSAMPLE(*inptr0++);
nuclear@0 258 outptr[RGB_RED] = range_limit[y + cred];
nuclear@0 259 outptr[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 260 outptr[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 261 outptr += RGB_PIXELSIZE;
nuclear@0 262 y = GETJSAMPLE(*inptr0++);
nuclear@0 263 outptr[RGB_RED] = range_limit[y + cred];
nuclear@0 264 outptr[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 265 outptr[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 266 outptr += RGB_PIXELSIZE;
nuclear@0 267 }
nuclear@0 268 /* If image width is odd, do the last output column separately */
nuclear@0 269 if (cinfo->output_width & 1) {
nuclear@0 270 cb = GETJSAMPLE(*inptr1);
nuclear@0 271 cr = GETJSAMPLE(*inptr2);
nuclear@0 272 cred = Crrtab[cr];
nuclear@0 273 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@0 274 cblue = Cbbtab[cb];
nuclear@0 275 y = GETJSAMPLE(*inptr0);
nuclear@0 276 outptr[RGB_RED] = range_limit[y + cred];
nuclear@0 277 outptr[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 278 outptr[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 279 }
nuclear@0 280 }
nuclear@0 281
nuclear@0 282
nuclear@0 283 /*
nuclear@0 284 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
nuclear@0 285 */
nuclear@0 286
nuclear@0 287 METHODDEF(void)
nuclear@0 288 h2v2_merged_upsample (j_decompress_ptr cinfo,
nuclear@0 289 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
nuclear@0 290 JSAMPARRAY output_buf)
nuclear@0 291 {
nuclear@0 292 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@0 293 register int y, cred, cgreen, cblue;
nuclear@0 294 int cb, cr;
nuclear@0 295 register JSAMPROW outptr0, outptr1;
nuclear@0 296 JSAMPROW inptr00, inptr01, inptr1, inptr2;
nuclear@0 297 JDIMENSION col;
nuclear@0 298 /* copy these pointers into registers if possible */
nuclear@0 299 register JSAMPLE * range_limit = cinfo->sample_range_limit;
nuclear@0 300 int * Crrtab = upsample->Cr_r_tab;
nuclear@0 301 int * Cbbtab = upsample->Cb_b_tab;
nuclear@0 302 INT32 * Crgtab = upsample->Cr_g_tab;
nuclear@0 303 INT32 * Cbgtab = upsample->Cb_g_tab;
nuclear@0 304 SHIFT_TEMPS
nuclear@0 305
nuclear@0 306 inptr00 = input_buf[0][in_row_group_ctr*2];
nuclear@0 307 inptr01 = input_buf[0][in_row_group_ctr*2 + 1];
nuclear@0 308 inptr1 = input_buf[1][in_row_group_ctr];
nuclear@0 309 inptr2 = input_buf[2][in_row_group_ctr];
nuclear@0 310 outptr0 = output_buf[0];
nuclear@0 311 outptr1 = output_buf[1];
nuclear@0 312 /* Loop for each group of output pixels */
nuclear@0 313 for (col = cinfo->output_width >> 1; col > 0; col--) {
nuclear@0 314 /* Do the chroma part of the calculation */
nuclear@0 315 cb = GETJSAMPLE(*inptr1++);
nuclear@0 316 cr = GETJSAMPLE(*inptr2++);
nuclear@0 317 cred = Crrtab[cr];
nuclear@0 318 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@0 319 cblue = Cbbtab[cb];
nuclear@0 320 /* Fetch 4 Y values and emit 4 pixels */
nuclear@0 321 y = GETJSAMPLE(*inptr00++);
nuclear@0 322 outptr0[RGB_RED] = range_limit[y + cred];
nuclear@0 323 outptr0[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 324 outptr0[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 325 outptr0 += RGB_PIXELSIZE;
nuclear@0 326 y = GETJSAMPLE(*inptr00++);
nuclear@0 327 outptr0[RGB_RED] = range_limit[y + cred];
nuclear@0 328 outptr0[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 329 outptr0[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 330 outptr0 += RGB_PIXELSIZE;
nuclear@0 331 y = GETJSAMPLE(*inptr01++);
nuclear@0 332 outptr1[RGB_RED] = range_limit[y + cred];
nuclear@0 333 outptr1[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 334 outptr1[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 335 outptr1 += RGB_PIXELSIZE;
nuclear@0 336 y = GETJSAMPLE(*inptr01++);
nuclear@0 337 outptr1[RGB_RED] = range_limit[y + cred];
nuclear@0 338 outptr1[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 339 outptr1[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 340 outptr1 += RGB_PIXELSIZE;
nuclear@0 341 }
nuclear@0 342 /* If image width is odd, do the last output column separately */
nuclear@0 343 if (cinfo->output_width & 1) {
nuclear@0 344 cb = GETJSAMPLE(*inptr1);
nuclear@0 345 cr = GETJSAMPLE(*inptr2);
nuclear@0 346 cred = Crrtab[cr];
nuclear@0 347 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@0 348 cblue = Cbbtab[cb];
nuclear@0 349 y = GETJSAMPLE(*inptr00);
nuclear@0 350 outptr0[RGB_RED] = range_limit[y + cred];
nuclear@0 351 outptr0[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 352 outptr0[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 353 y = GETJSAMPLE(*inptr01);
nuclear@0 354 outptr1[RGB_RED] = range_limit[y + cred];
nuclear@0 355 outptr1[RGB_GREEN] = range_limit[y + cgreen];
nuclear@0 356 outptr1[RGB_BLUE] = range_limit[y + cblue];
nuclear@0 357 }
nuclear@0 358 }
nuclear@0 359
nuclear@0 360
nuclear@0 361 /*
nuclear@0 362 * Module initialization routine for merged upsampling/color conversion.
nuclear@0 363 *
nuclear@0 364 * NB: this is called under the conditions determined by use_merged_upsample()
nuclear@0 365 * in jdmaster.c. That routine MUST correspond to the actual capabilities
nuclear@0 366 * of this module; no safety checks are made here.
nuclear@0 367 */
nuclear@0 368
nuclear@0 369 GLOBAL(void)
nuclear@0 370 jinit_merged_upsampler (j_decompress_ptr cinfo)
nuclear@0 371 {
nuclear@0 372 my_upsample_ptr upsample;
nuclear@0 373
nuclear@0 374 upsample = (my_upsample_ptr)
nuclear@0 375 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@0 376 SIZEOF(my_upsampler));
nuclear@0 377 cinfo->upsample = (struct jpeg_upsampler *) upsample;
nuclear@0 378 upsample->pub.start_pass = start_pass_merged_upsample;
nuclear@0 379 upsample->pub.need_context_rows = FALSE;
nuclear@0 380
nuclear@0 381 upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
nuclear@0 382
nuclear@0 383 if (cinfo->max_v_samp_factor == 2) {
nuclear@0 384 upsample->pub.upsample = merged_2v_upsample;
nuclear@0 385 upsample->upmethod = h2v2_merged_upsample;
nuclear@0 386 /* Allocate a spare row buffer */
nuclear@0 387 upsample->spare_row = (JSAMPROW)
nuclear@0 388 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@0 389 (size_t) (upsample->out_row_width * SIZEOF(JSAMPLE)));
nuclear@0 390 } else {
nuclear@0 391 upsample->pub.upsample = merged_1v_upsample;
nuclear@0 392 upsample->upmethod = h2v1_merged_upsample;
nuclear@0 393 /* No spare row needed */
nuclear@0 394 upsample->spare_row = NULL;
nuclear@0 395 }
nuclear@0 396
nuclear@0 397 build_ycc_rgb_table(cinfo);
nuclear@0 398 }
nuclear@0 399
nuclear@0 400 #endif /* UPSAMPLE_MERGING_SUPPORTED */