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annotate libs/libjpeg/jdmerge.c @ 39:ff055bff6a15

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author John Tsiombikas <nuclear@mutantstargoat.com>
date Sun, 11 Sep 2011 09:03:18 +0300
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nuclear@26 1 /*
nuclear@26 2 * jdmerge.c
nuclear@26 3 *
nuclear@26 4 * Copyright (C) 1994-1996, Thomas G. Lane.
nuclear@26 5 * This file is part of the Independent JPEG Group's software.
nuclear@26 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@26 7 *
nuclear@26 8 * This file contains code for merged upsampling/color conversion.
nuclear@26 9 *
nuclear@26 10 * This file combines functions from jdsample.c and jdcolor.c;
nuclear@26 11 * read those files first to understand what's going on.
nuclear@26 12 *
nuclear@26 13 * When the chroma components are to be upsampled by simple replication
nuclear@26 14 * (ie, box filtering), we can save some work in color conversion by
nuclear@26 15 * calculating all the output pixels corresponding to a pair of chroma
nuclear@26 16 * samples at one time. In the conversion equations
nuclear@26 17 * R = Y + K1 * Cr
nuclear@26 18 * G = Y + K2 * Cb + K3 * Cr
nuclear@26 19 * B = Y + K4 * Cb
nuclear@26 20 * only the Y term varies among the group of pixels corresponding to a pair
nuclear@26 21 * of chroma samples, so the rest of the terms can be calculated just once.
nuclear@26 22 * At typical sampling ratios, this eliminates half or three-quarters of the
nuclear@26 23 * multiplications needed for color conversion.
nuclear@26 24 *
nuclear@26 25 * This file currently provides implementations for the following cases:
nuclear@26 26 * YCbCr => RGB color conversion only.
nuclear@26 27 * Sampling ratios of 2h1v or 2h2v.
nuclear@26 28 * No scaling needed at upsample time.
nuclear@26 29 * Corner-aligned (non-CCIR601) sampling alignment.
nuclear@26 30 * Other special cases could be added, but in most applications these are
nuclear@26 31 * the only common cases. (For uncommon cases we fall back on the more
nuclear@26 32 * general code in jdsample.c and jdcolor.c.)
nuclear@26 33 */
nuclear@26 34
nuclear@26 35 #define JPEG_INTERNALS
nuclear@26 36 #include "jinclude.h"
nuclear@26 37 #include "jpeglib.h"
nuclear@26 38
nuclear@26 39 #ifdef UPSAMPLE_MERGING_SUPPORTED
nuclear@26 40
nuclear@26 41
nuclear@26 42 /* Private subobject */
nuclear@26 43
nuclear@26 44 typedef struct {
nuclear@26 45 struct jpeg_upsampler pub; /* public fields */
nuclear@26 46
nuclear@26 47 /* Pointer to routine to do actual upsampling/conversion of one row group */
nuclear@26 48 JMETHOD(void, upmethod, (j_decompress_ptr cinfo,
nuclear@26 49 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
nuclear@26 50 JSAMPARRAY output_buf));
nuclear@26 51
nuclear@26 52 /* Private state for YCC->RGB conversion */
nuclear@26 53 int * Cr_r_tab; /* => table for Cr to R conversion */
nuclear@26 54 int * Cb_b_tab; /* => table for Cb to B conversion */
nuclear@26 55 INT32 * Cr_g_tab; /* => table for Cr to G conversion */
nuclear@26 56 INT32 * Cb_g_tab; /* => table for Cb to G conversion */
nuclear@26 57
nuclear@26 58 /* For 2:1 vertical sampling, we produce two output rows at a time.
nuclear@26 59 * We need a "spare" row buffer to hold the second output row if the
nuclear@26 60 * application provides just a one-row buffer; we also use the spare
nuclear@26 61 * to discard the dummy last row if the image height is odd.
nuclear@26 62 */
nuclear@26 63 JSAMPROW spare_row;
nuclear@26 64 boolean spare_full; /* T if spare buffer is occupied */
nuclear@26 65
nuclear@26 66 JDIMENSION out_row_width; /* samples per output row */
nuclear@26 67 JDIMENSION rows_to_go; /* counts rows remaining in image */
nuclear@26 68 } my_upsampler;
nuclear@26 69
nuclear@26 70 typedef my_upsampler * my_upsample_ptr;
nuclear@26 71
nuclear@26 72 #define SCALEBITS 16 /* speediest right-shift on some machines */
nuclear@26 73 #define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
nuclear@26 74 #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
nuclear@26 75
nuclear@26 76
nuclear@26 77 /*
nuclear@26 78 * Initialize tables for YCC->RGB colorspace conversion.
nuclear@26 79 * This is taken directly from jdcolor.c; see that file for more info.
nuclear@26 80 */
nuclear@26 81
nuclear@26 82 LOCAL(void)
nuclear@26 83 build_ycc_rgb_table (j_decompress_ptr cinfo)
nuclear@26 84 {
nuclear@26 85 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@26 86 int i;
nuclear@26 87 INT32 x;
nuclear@26 88 SHIFT_TEMPS
nuclear@26 89
nuclear@26 90 upsample->Cr_r_tab = (int *)
nuclear@26 91 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 92 (MAXJSAMPLE+1) * SIZEOF(int));
nuclear@26 93 upsample->Cb_b_tab = (int *)
nuclear@26 94 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 95 (MAXJSAMPLE+1) * SIZEOF(int));
nuclear@26 96 upsample->Cr_g_tab = (INT32 *)
nuclear@26 97 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 98 (MAXJSAMPLE+1) * SIZEOF(INT32));
nuclear@26 99 upsample->Cb_g_tab = (INT32 *)
nuclear@26 100 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 101 (MAXJSAMPLE+1) * SIZEOF(INT32));
nuclear@26 102
nuclear@26 103 for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
nuclear@26 104 /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
nuclear@26 105 /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
nuclear@26 106 /* Cr=>R value is nearest int to 1.40200 * x */
nuclear@26 107 upsample->Cr_r_tab[i] = (int)
nuclear@26 108 RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
nuclear@26 109 /* Cb=>B value is nearest int to 1.77200 * x */
nuclear@26 110 upsample->Cb_b_tab[i] = (int)
nuclear@26 111 RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
nuclear@26 112 /* Cr=>G value is scaled-up -0.71414 * x */
nuclear@26 113 upsample->Cr_g_tab[i] = (- FIX(0.71414)) * x;
nuclear@26 114 /* Cb=>G value is scaled-up -0.34414 * x */
nuclear@26 115 /* We also add in ONE_HALF so that need not do it in inner loop */
nuclear@26 116 upsample->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
nuclear@26 117 }
nuclear@26 118 }
nuclear@26 119
nuclear@26 120
nuclear@26 121 /*
nuclear@26 122 * Initialize for an upsampling pass.
nuclear@26 123 */
nuclear@26 124
nuclear@26 125 METHODDEF(void)
nuclear@26 126 start_pass_merged_upsample (j_decompress_ptr cinfo)
nuclear@26 127 {
nuclear@26 128 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@26 129
nuclear@26 130 /* Mark the spare buffer empty */
nuclear@26 131 upsample->spare_full = FALSE;
nuclear@26 132 /* Initialize total-height counter for detecting bottom of image */
nuclear@26 133 upsample->rows_to_go = cinfo->output_height;
nuclear@26 134 }
nuclear@26 135
nuclear@26 136
nuclear@26 137 /*
nuclear@26 138 * Control routine to do upsampling (and color conversion).
nuclear@26 139 *
nuclear@26 140 * The control routine just handles the row buffering considerations.
nuclear@26 141 */
nuclear@26 142
nuclear@26 143 METHODDEF(void)
nuclear@26 144 merged_2v_upsample (j_decompress_ptr cinfo,
nuclear@26 145 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@26 146 JDIMENSION in_row_groups_avail,
nuclear@26 147 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@26 148 JDIMENSION out_rows_avail)
nuclear@26 149 /* 2:1 vertical sampling case: may need a spare row. */
nuclear@26 150 {
nuclear@26 151 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@26 152 JSAMPROW work_ptrs[2];
nuclear@26 153 JDIMENSION num_rows; /* number of rows returned to caller */
nuclear@26 154
nuclear@26 155 if (upsample->spare_full) {
nuclear@26 156 /* If we have a spare row saved from a previous cycle, just return it. */
nuclear@26 157 jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0,
nuclear@26 158 1, upsample->out_row_width);
nuclear@26 159 num_rows = 1;
nuclear@26 160 upsample->spare_full = FALSE;
nuclear@26 161 } else {
nuclear@26 162 /* Figure number of rows to return to caller. */
nuclear@26 163 num_rows = 2;
nuclear@26 164 /* Not more than the distance to the end of the image. */
nuclear@26 165 if (num_rows > upsample->rows_to_go)
nuclear@26 166 num_rows = upsample->rows_to_go;
nuclear@26 167 /* And not more than what the client can accept: */
nuclear@26 168 out_rows_avail -= *out_row_ctr;
nuclear@26 169 if (num_rows > out_rows_avail)
nuclear@26 170 num_rows = out_rows_avail;
nuclear@26 171 /* Create output pointer array for upsampler. */
nuclear@26 172 work_ptrs[0] = output_buf[*out_row_ctr];
nuclear@26 173 if (num_rows > 1) {
nuclear@26 174 work_ptrs[1] = output_buf[*out_row_ctr + 1];
nuclear@26 175 } else {
nuclear@26 176 work_ptrs[1] = upsample->spare_row;
nuclear@26 177 upsample->spare_full = TRUE;
nuclear@26 178 }
nuclear@26 179 /* Now do the upsampling. */
nuclear@26 180 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
nuclear@26 181 }
nuclear@26 182
nuclear@26 183 /* Adjust counts */
nuclear@26 184 *out_row_ctr += num_rows;
nuclear@26 185 upsample->rows_to_go -= num_rows;
nuclear@26 186 /* When the buffer is emptied, declare this input row group consumed */
nuclear@26 187 if (! upsample->spare_full)
nuclear@26 188 (*in_row_group_ctr)++;
nuclear@26 189 }
nuclear@26 190
nuclear@26 191
nuclear@26 192 METHODDEF(void)
nuclear@26 193 merged_1v_upsample (j_decompress_ptr cinfo,
nuclear@26 194 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
nuclear@26 195 JDIMENSION in_row_groups_avail,
nuclear@26 196 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
nuclear@26 197 JDIMENSION out_rows_avail)
nuclear@26 198 /* 1:1 vertical sampling case: much easier, never need a spare row. */
nuclear@26 199 {
nuclear@26 200 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@26 201
nuclear@26 202 /* Just do the upsampling. */
nuclear@26 203 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
nuclear@26 204 output_buf + *out_row_ctr);
nuclear@26 205 /* Adjust counts */
nuclear@26 206 (*out_row_ctr)++;
nuclear@26 207 (*in_row_group_ctr)++;
nuclear@26 208 }
nuclear@26 209
nuclear@26 210
nuclear@26 211 /*
nuclear@26 212 * These are the routines invoked by the control routines to do
nuclear@26 213 * the actual upsampling/conversion. One row group is processed per call.
nuclear@26 214 *
nuclear@26 215 * Note: since we may be writing directly into application-supplied buffers,
nuclear@26 216 * we have to be honest about the output width; we can't assume the buffer
nuclear@26 217 * has been rounded up to an even width.
nuclear@26 218 */
nuclear@26 219
nuclear@26 220
nuclear@26 221 /*
nuclear@26 222 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
nuclear@26 223 */
nuclear@26 224
nuclear@26 225 METHODDEF(void)
nuclear@26 226 h2v1_merged_upsample (j_decompress_ptr cinfo,
nuclear@26 227 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
nuclear@26 228 JSAMPARRAY output_buf)
nuclear@26 229 {
nuclear@26 230 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@26 231 register int y, cred, cgreen, cblue;
nuclear@26 232 int cb, cr;
nuclear@26 233 register JSAMPROW outptr;
nuclear@26 234 JSAMPROW inptr0, inptr1, inptr2;
nuclear@26 235 JDIMENSION col;
nuclear@26 236 /* copy these pointers into registers if possible */
nuclear@26 237 register JSAMPLE * range_limit = cinfo->sample_range_limit;
nuclear@26 238 int * Crrtab = upsample->Cr_r_tab;
nuclear@26 239 int * Cbbtab = upsample->Cb_b_tab;
nuclear@26 240 INT32 * Crgtab = upsample->Cr_g_tab;
nuclear@26 241 INT32 * Cbgtab = upsample->Cb_g_tab;
nuclear@26 242 SHIFT_TEMPS
nuclear@26 243
nuclear@26 244 inptr0 = input_buf[0][in_row_group_ctr];
nuclear@26 245 inptr1 = input_buf[1][in_row_group_ctr];
nuclear@26 246 inptr2 = input_buf[2][in_row_group_ctr];
nuclear@26 247 outptr = output_buf[0];
nuclear@26 248 /* Loop for each pair of output pixels */
nuclear@26 249 for (col = cinfo->output_width >> 1; col > 0; col--) {
nuclear@26 250 /* Do the chroma part of the calculation */
nuclear@26 251 cb = GETJSAMPLE(*inptr1++);
nuclear@26 252 cr = GETJSAMPLE(*inptr2++);
nuclear@26 253 cred = Crrtab[cr];
nuclear@26 254 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@26 255 cblue = Cbbtab[cb];
nuclear@26 256 /* Fetch 2 Y values and emit 2 pixels */
nuclear@26 257 y = GETJSAMPLE(*inptr0++);
nuclear@26 258 outptr[RGB_RED] = range_limit[y + cred];
nuclear@26 259 outptr[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 260 outptr[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 261 outptr += RGB_PIXELSIZE;
nuclear@26 262 y = GETJSAMPLE(*inptr0++);
nuclear@26 263 outptr[RGB_RED] = range_limit[y + cred];
nuclear@26 264 outptr[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 265 outptr[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 266 outptr += RGB_PIXELSIZE;
nuclear@26 267 }
nuclear@26 268 /* If image width is odd, do the last output column separately */
nuclear@26 269 if (cinfo->output_width & 1) {
nuclear@26 270 cb = GETJSAMPLE(*inptr1);
nuclear@26 271 cr = GETJSAMPLE(*inptr2);
nuclear@26 272 cred = Crrtab[cr];
nuclear@26 273 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@26 274 cblue = Cbbtab[cb];
nuclear@26 275 y = GETJSAMPLE(*inptr0);
nuclear@26 276 outptr[RGB_RED] = range_limit[y + cred];
nuclear@26 277 outptr[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 278 outptr[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 279 }
nuclear@26 280 }
nuclear@26 281
nuclear@26 282
nuclear@26 283 /*
nuclear@26 284 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
nuclear@26 285 */
nuclear@26 286
nuclear@26 287 METHODDEF(void)
nuclear@26 288 h2v2_merged_upsample (j_decompress_ptr cinfo,
nuclear@26 289 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
nuclear@26 290 JSAMPARRAY output_buf)
nuclear@26 291 {
nuclear@26 292 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
nuclear@26 293 register int y, cred, cgreen, cblue;
nuclear@26 294 int cb, cr;
nuclear@26 295 register JSAMPROW outptr0, outptr1;
nuclear@26 296 JSAMPROW inptr00, inptr01, inptr1, inptr2;
nuclear@26 297 JDIMENSION col;
nuclear@26 298 /* copy these pointers into registers if possible */
nuclear@26 299 register JSAMPLE * range_limit = cinfo->sample_range_limit;
nuclear@26 300 int * Crrtab = upsample->Cr_r_tab;
nuclear@26 301 int * Cbbtab = upsample->Cb_b_tab;
nuclear@26 302 INT32 * Crgtab = upsample->Cr_g_tab;
nuclear@26 303 INT32 * Cbgtab = upsample->Cb_g_tab;
nuclear@26 304 SHIFT_TEMPS
nuclear@26 305
nuclear@26 306 inptr00 = input_buf[0][in_row_group_ctr*2];
nuclear@26 307 inptr01 = input_buf[0][in_row_group_ctr*2 + 1];
nuclear@26 308 inptr1 = input_buf[1][in_row_group_ctr];
nuclear@26 309 inptr2 = input_buf[2][in_row_group_ctr];
nuclear@26 310 outptr0 = output_buf[0];
nuclear@26 311 outptr1 = output_buf[1];
nuclear@26 312 /* Loop for each group of output pixels */
nuclear@26 313 for (col = cinfo->output_width >> 1; col > 0; col--) {
nuclear@26 314 /* Do the chroma part of the calculation */
nuclear@26 315 cb = GETJSAMPLE(*inptr1++);
nuclear@26 316 cr = GETJSAMPLE(*inptr2++);
nuclear@26 317 cred = Crrtab[cr];
nuclear@26 318 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@26 319 cblue = Cbbtab[cb];
nuclear@26 320 /* Fetch 4 Y values and emit 4 pixels */
nuclear@26 321 y = GETJSAMPLE(*inptr00++);
nuclear@26 322 outptr0[RGB_RED] = range_limit[y + cred];
nuclear@26 323 outptr0[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 324 outptr0[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 325 outptr0 += RGB_PIXELSIZE;
nuclear@26 326 y = GETJSAMPLE(*inptr00++);
nuclear@26 327 outptr0[RGB_RED] = range_limit[y + cred];
nuclear@26 328 outptr0[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 329 outptr0[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 330 outptr0 += RGB_PIXELSIZE;
nuclear@26 331 y = GETJSAMPLE(*inptr01++);
nuclear@26 332 outptr1[RGB_RED] = range_limit[y + cred];
nuclear@26 333 outptr1[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 334 outptr1[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 335 outptr1 += RGB_PIXELSIZE;
nuclear@26 336 y = GETJSAMPLE(*inptr01++);
nuclear@26 337 outptr1[RGB_RED] = range_limit[y + cred];
nuclear@26 338 outptr1[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 339 outptr1[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 340 outptr1 += RGB_PIXELSIZE;
nuclear@26 341 }
nuclear@26 342 /* If image width is odd, do the last output column separately */
nuclear@26 343 if (cinfo->output_width & 1) {
nuclear@26 344 cb = GETJSAMPLE(*inptr1);
nuclear@26 345 cr = GETJSAMPLE(*inptr2);
nuclear@26 346 cred = Crrtab[cr];
nuclear@26 347 cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
nuclear@26 348 cblue = Cbbtab[cb];
nuclear@26 349 y = GETJSAMPLE(*inptr00);
nuclear@26 350 outptr0[RGB_RED] = range_limit[y + cred];
nuclear@26 351 outptr0[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 352 outptr0[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 353 y = GETJSAMPLE(*inptr01);
nuclear@26 354 outptr1[RGB_RED] = range_limit[y + cred];
nuclear@26 355 outptr1[RGB_GREEN] = range_limit[y + cgreen];
nuclear@26 356 outptr1[RGB_BLUE] = range_limit[y + cblue];
nuclear@26 357 }
nuclear@26 358 }
nuclear@26 359
nuclear@26 360
nuclear@26 361 /*
nuclear@26 362 * Module initialization routine for merged upsampling/color conversion.
nuclear@26 363 *
nuclear@26 364 * NB: this is called under the conditions determined by use_merged_upsample()
nuclear@26 365 * in jdmaster.c. That routine MUST correspond to the actual capabilities
nuclear@26 366 * of this module; no safety checks are made here.
nuclear@26 367 */
nuclear@26 368
nuclear@26 369 GLOBAL(void)
nuclear@26 370 jinit_merged_upsampler (j_decompress_ptr cinfo)
nuclear@26 371 {
nuclear@26 372 my_upsample_ptr upsample;
nuclear@26 373
nuclear@26 374 upsample = (my_upsample_ptr)
nuclear@26 375 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 376 SIZEOF(my_upsampler));
nuclear@26 377 cinfo->upsample = (struct jpeg_upsampler *) upsample;
nuclear@26 378 upsample->pub.start_pass = start_pass_merged_upsample;
nuclear@26 379 upsample->pub.need_context_rows = FALSE;
nuclear@26 380
nuclear@26 381 upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
nuclear@26 382
nuclear@26 383 if (cinfo->max_v_samp_factor == 2) {
nuclear@26 384 upsample->pub.upsample = merged_2v_upsample;
nuclear@26 385 upsample->upmethod = h2v2_merged_upsample;
nuclear@26 386 /* Allocate a spare row buffer */
nuclear@26 387 upsample->spare_row = (JSAMPROW)
nuclear@26 388 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 389 (size_t) (upsample->out_row_width * SIZEOF(JSAMPLE)));
nuclear@26 390 } else {
nuclear@26 391 upsample->pub.upsample = merged_1v_upsample;
nuclear@26 392 upsample->upmethod = h2v1_merged_upsample;
nuclear@26 393 /* No spare row needed */
nuclear@26 394 upsample->spare_row = NULL;
nuclear@26 395 }
nuclear@26 396
nuclear@26 397 build_ycc_rgb_table(cinfo);
nuclear@26 398 }
nuclear@26 399
nuclear@26 400 #endif /* UPSAMPLE_MERGING_SUPPORTED */