1/*
2 * jdmerge.c
3 *
4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1994-1996, Thomas G. Lane.
6 * libjpeg-turbo Modifications:
7 * Copyright 2009 Pierre Ossman <[email protected]> for Cendio AB
8 * Copyright (C) 2009, 2011, 2014-2015, 2020, D. R. Commander.
9 * Copyright (C) 2013, Linaro Limited.
10 * For conditions of distribution and use, see the accompanying README.ijg
11 * file.
12 *
13 * This file contains code for merged upsampling/color conversion.
14 *
15 * This file combines functions from jdsample.c and jdcolor.c;
16 * read those files first to understand what's going on.
17 *
18 * When the chroma components are to be upsampled by simple replication
19 * (ie, box filtering), we can save some work in color conversion by
20 * calculating all the output pixels corresponding to a pair of chroma
21 * samples at one time. In the conversion equations
22 * R = Y + K1 * Cr
23 * G = Y + K2 * Cb + K3 * Cr
24 * B = Y + K4 * Cb
25 * only the Y term varies among the group of pixels corresponding to a pair
26 * of chroma samples, so the rest of the terms can be calculated just once.
27 * At typical sampling ratios, this eliminates half or three-quarters of the
28 * multiplications needed for color conversion.
29 *
30 * This file currently provides implementations for the following cases:
31 * YCbCr => RGB color conversion only.
32 * Sampling ratios of 2h1v or 2h2v.
33 * No scaling needed at upsample time.
34 * Corner-aligned (non-CCIR601) sampling alignment.
35 * Other special cases could be added, but in most applications these are
36 * the only common cases. (For uncommon cases we fall back on the more
37 * general code in jdsample.c and jdcolor.c.)
38 */
39
40#define JPEG_INTERNALS
41#include "jinclude.h"
42#include "jpeglib.h"
43#include "jdmerge.h"
44#include "jsimd.h"
45#include "jconfigint.h"
46
47#ifdef UPSAMPLE_MERGING_SUPPORTED
48
49
50#define SCALEBITS 16 /* speediest right-shift on some machines */
51#define ONE_HALF ((JLONG)1 << (SCALEBITS - 1))
52#define FIX(x) ((JLONG)((x) * (1L << SCALEBITS) + 0.5))
53
54
55/* Include inline routines for colorspace extensions */
56
57#include "jdmrgext.c"
58#undef RGB_RED
59#undef RGB_GREEN
60#undef RGB_BLUE
61#undef RGB_PIXELSIZE
62
63#define RGB_RED EXT_RGB_RED
64#define RGB_GREEN EXT_RGB_GREEN
65#define RGB_BLUE EXT_RGB_BLUE
66#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
67#define h2v1_merged_upsample_internal extrgb_h2v1_merged_upsample_internal
68#define h2v2_merged_upsample_internal extrgb_h2v2_merged_upsample_internal
69#include "jdmrgext.c"
70#undef RGB_RED
71#undef RGB_GREEN
72#undef RGB_BLUE
73#undef RGB_PIXELSIZE
74#undef h2v1_merged_upsample_internal
75#undef h2v2_merged_upsample_internal
76
77#define RGB_RED EXT_RGBX_RED
78#define RGB_GREEN EXT_RGBX_GREEN
79#define RGB_BLUE EXT_RGBX_BLUE
80#define RGB_ALPHA 3
81#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
82#define h2v1_merged_upsample_internal extrgbx_h2v1_merged_upsample_internal
83#define h2v2_merged_upsample_internal extrgbx_h2v2_merged_upsample_internal
84#include "jdmrgext.c"
85#undef RGB_RED
86#undef RGB_GREEN
87#undef RGB_BLUE
88#undef RGB_ALPHA
89#undef RGB_PIXELSIZE
90#undef h2v1_merged_upsample_internal
91#undef h2v2_merged_upsample_internal
92
93#define RGB_RED EXT_BGR_RED
94#define RGB_GREEN EXT_BGR_GREEN
95#define RGB_BLUE EXT_BGR_BLUE
96#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
97#define h2v1_merged_upsample_internal extbgr_h2v1_merged_upsample_internal
98#define h2v2_merged_upsample_internal extbgr_h2v2_merged_upsample_internal
99#include "jdmrgext.c"
100#undef RGB_RED
101#undef RGB_GREEN
102#undef RGB_BLUE
103#undef RGB_PIXELSIZE
104#undef h2v1_merged_upsample_internal
105#undef h2v2_merged_upsample_internal
106
107#define RGB_RED EXT_BGRX_RED
108#define RGB_GREEN EXT_BGRX_GREEN
109#define RGB_BLUE EXT_BGRX_BLUE
110#define RGB_ALPHA 3
111#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
112#define h2v1_merged_upsample_internal extbgrx_h2v1_merged_upsample_internal
113#define h2v2_merged_upsample_internal extbgrx_h2v2_merged_upsample_internal
114#include "jdmrgext.c"
115#undef RGB_RED
116#undef RGB_GREEN
117#undef RGB_BLUE
118#undef RGB_ALPHA
119#undef RGB_PIXELSIZE
120#undef h2v1_merged_upsample_internal
121#undef h2v2_merged_upsample_internal
122
123#define RGB_RED EXT_XBGR_RED
124#define RGB_GREEN EXT_XBGR_GREEN
125#define RGB_BLUE EXT_XBGR_BLUE
126#define RGB_ALPHA 0
127#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
128#define h2v1_merged_upsample_internal extxbgr_h2v1_merged_upsample_internal
129#define h2v2_merged_upsample_internal extxbgr_h2v2_merged_upsample_internal
130#include "jdmrgext.c"
131#undef RGB_RED
132#undef RGB_GREEN
133#undef RGB_BLUE
134#undef RGB_ALPHA
135#undef RGB_PIXELSIZE
136#undef h2v1_merged_upsample_internal
137#undef h2v2_merged_upsample_internal
138
139#define RGB_RED EXT_XRGB_RED
140#define RGB_GREEN EXT_XRGB_GREEN
141#define RGB_BLUE EXT_XRGB_BLUE
142#define RGB_ALPHA 0
143#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
144#define h2v1_merged_upsample_internal extxrgb_h2v1_merged_upsample_internal
145#define h2v2_merged_upsample_internal extxrgb_h2v2_merged_upsample_internal
146#include "jdmrgext.c"
147#undef RGB_RED
148#undef RGB_GREEN
149#undef RGB_BLUE
150#undef RGB_ALPHA
151#undef RGB_PIXELSIZE
152#undef h2v1_merged_upsample_internal
153#undef h2v2_merged_upsample_internal
154
155
156/*
157 * Initialize tables for YCC->RGB colorspace conversion.
158 * This is taken directly from jdcolor.c; see that file for more info.
159 */
160
161LOCAL(void)
162build_ycc_rgb_table(j_decompress_ptr cinfo)
163{
164 my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
165 int i;
166 JLONG x;
167 SHIFT_TEMPS
168
169 upsample->Cr_r_tab = (int *)
170 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
171 (MAXJSAMPLE + 1) * sizeof(int));
172 upsample->Cb_b_tab = (int *)
173 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
174 (MAXJSAMPLE + 1) * sizeof(int));
175 upsample->Cr_g_tab = (JLONG *)
176 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
177 (MAXJSAMPLE + 1) * sizeof(JLONG));
178 upsample->Cb_g_tab = (JLONG *)
179 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
180 (MAXJSAMPLE + 1) * sizeof(JLONG));
181
182 for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
183 /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
184 /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
185 /* Cr=>R value is nearest int to 1.40200 * x */
186 upsample->Cr_r_tab[i] = (int)
187 RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
188 /* Cb=>B value is nearest int to 1.77200 * x */
189 upsample->Cb_b_tab[i] = (int)
190 RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
191 /* Cr=>G value is scaled-up -0.71414 * x */
192 upsample->Cr_g_tab[i] = (-FIX(0.71414)) * x;
193 /* Cb=>G value is scaled-up -0.34414 * x */
194 /* We also add in ONE_HALF so that need not do it in inner loop */
195 upsample->Cb_g_tab[i] = (-FIX(0.34414)) * x + ONE_HALF;
196 }
197}
198
199
200/*
201 * Initialize for an upsampling pass.
202 */
203
204METHODDEF(void)
205start_pass_merged_upsample(j_decompress_ptr cinfo)
206{
207 my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
208
209 /* Mark the spare buffer empty */
210 upsample->spare_full = FALSE;
211 /* Initialize total-height counter for detecting bottom of image */
212 upsample->rows_to_go = cinfo->output_height;
213}
214
215
216/*
217 * Control routine to do upsampling (and color conversion).
218 *
219 * The control routine just handles the row buffering considerations.
220 */
221
222METHODDEF(void)
223merged_2v_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
224 JDIMENSION *in_row_group_ctr,
225 JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
226 JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
227/* 2:1 vertical sampling case: may need a spare row. */
228{
229 my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
230 JSAMPROW work_ptrs[2];
231 JDIMENSION num_rows; /* number of rows returned to caller */
232
233 if (upsample->spare_full) {
234 /* If we have a spare row saved from a previous cycle, just return it. */
235 JDIMENSION size = upsample->out_row_width;
236 if (cinfo->out_color_space == JCS_RGB565)
237 size = cinfo->output_width * 2;
238 jcopy_sample_rows(&upsample->spare_row, 0, output_buf + *out_row_ctr, 0, 1,
239 size);
240 num_rows = 1;
241 upsample->spare_full = FALSE;
242 } else {
243 /* Figure number of rows to return to caller. */
244 num_rows = 2;
245 /* Not more than the distance to the end of the image. */
246 if (num_rows > upsample->rows_to_go)
247 num_rows = upsample->rows_to_go;
248 /* And not more than what the client can accept: */
249 out_rows_avail -= *out_row_ctr;
250 if (num_rows > out_rows_avail)
251 num_rows = out_rows_avail;
252 /* Create output pointer array for upsampler. */
253 work_ptrs[0] = output_buf[*out_row_ctr];
254 if (num_rows > 1) {
255 work_ptrs[1] = output_buf[*out_row_ctr + 1];
256 } else {
257 work_ptrs[1] = upsample->spare_row;
258 upsample->spare_full = TRUE;
259 }
260 /* Now do the upsampling. */
261 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
262 }
263
264 /* Adjust counts */
265 *out_row_ctr += num_rows;
266 upsample->rows_to_go -= num_rows;
267 /* When the buffer is emptied, declare this input row group consumed */
268 if (!upsample->spare_full)
269 (*in_row_group_ctr)++;
270}
271
272
273METHODDEF(void)
274merged_1v_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
275 JDIMENSION *in_row_group_ctr,
276 JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
277 JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
278/* 1:1 vertical sampling case: much easier, never need a spare row. */
279{
280 my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
281
282 /* Just do the upsampling. */
283 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
284 output_buf + *out_row_ctr);
285 /* Adjust counts */
286 (*out_row_ctr)++;
287 (*in_row_group_ctr)++;
288}
289
290
291/*
292 * These are the routines invoked by the control routines to do
293 * the actual upsampling/conversion. One row group is processed per call.
294 *
295 * Note: since we may be writing directly into application-supplied buffers,
296 * we have to be honest about the output width; we can't assume the buffer
297 * has been rounded up to an even width.
298 */
299
300
301/*
302 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
303 */
304
305METHODDEF(void)
306h2v1_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
307 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
308{
309 switch (cinfo->out_color_space) {
310 case JCS_EXT_RGB:
311 extrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
312 output_buf);
313 break;
314 case JCS_EXT_RGBX:
315 case JCS_EXT_RGBA:
316 extrgbx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
317 output_buf);
318 break;
319 case JCS_EXT_BGR:
320 extbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
321 output_buf);
322 break;
323 case JCS_EXT_BGRX:
324 case JCS_EXT_BGRA:
325 extbgrx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
326 output_buf);
327 break;
328 case JCS_EXT_XBGR:
329 case JCS_EXT_ABGR:
330 extxbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
331 output_buf);
332 break;
333 case JCS_EXT_XRGB:
334 case JCS_EXT_ARGB:
335 extxrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
336 output_buf);
337 break;
338 default:
339 h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
340 output_buf);
341 break;
342 }
343}
344
345
346/*
347 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
348 */
349
350METHODDEF(void)
351h2v2_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
352 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
353{
354 switch (cinfo->out_color_space) {
355 case JCS_EXT_RGB:
356 extrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
357 output_buf);
358 break;
359 case JCS_EXT_RGBX:
360 case JCS_EXT_RGBA:
361 extrgbx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
362 output_buf);
363 break;
364 case JCS_EXT_BGR:
365 extbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
366 output_buf);
367 break;
368 case JCS_EXT_BGRX:
369 case JCS_EXT_BGRA:
370 extbgrx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
371 output_buf);
372 break;
373 case JCS_EXT_XBGR:
374 case JCS_EXT_ABGR:
375 extxbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
376 output_buf);
377 break;
378 case JCS_EXT_XRGB:
379 case JCS_EXT_ARGB:
380 extxrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
381 output_buf);
382 break;
383 default:
384 h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
385 output_buf);
386 break;
387 }
388}
389
390
391/*
392 * RGB565 conversion
393 */
394
395#define PACK_SHORT_565_LE(r, g, b) \
396 ((((r) << 8) & 0xF800) | (((g) << 3) & 0x7E0) | ((b) >> 3))
397#define PACK_SHORT_565_BE(r, g, b) \
398 (((r) & 0xF8) | ((g) >> 5) | (((g) << 11) & 0xE000) | (((b) << 5) & 0x1F00))
399
400#define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
401#define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
402
403#define WRITE_TWO_PIXELS_LE(addr, pixels) { \
404 ((INT16 *)(addr))[0] = (INT16)(pixels); \
405 ((INT16 *)(addr))[1] = (INT16)((pixels) >> 16); \
406}
407#define WRITE_TWO_PIXELS_BE(addr, pixels) { \
408 ((INT16 *)(addr))[1] = (INT16)(pixels); \
409 ((INT16 *)(addr))[0] = (INT16)((pixels) >> 16); \
410}
411
412#define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
413#define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
414#define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
415
416
417/* Declarations for ordered dithering
418 *
419 * We use a 4x4 ordered dither array packed into 32 bits. This array is
420 * sufficient for dithering RGB888 to RGB565.
421 */
422
423#define DITHER_MASK 0x3
424#define DITHER_ROTATE(x) ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
425static const JLONG dither_matrix[4] = {
426 0x0008020A,
427 0x0C040E06,
428 0x030B0109,
429 0x0F070D05
430};
431
432
433/* Include inline routines for RGB565 conversion */
434
435#define PACK_SHORT_565 PACK_SHORT_565_LE
436#define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
437#define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_LE
438#define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_le
439#define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_le
440#define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_le
441#define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_le
442#include "jdmrg565.c"
443#undef PACK_SHORT_565
444#undef PACK_TWO_PIXELS
445#undef WRITE_TWO_PIXELS
446#undef h2v1_merged_upsample_565_internal
447#undef h2v1_merged_upsample_565D_internal
448#undef h2v2_merged_upsample_565_internal
449#undef h2v2_merged_upsample_565D_internal
450
451#define PACK_SHORT_565 PACK_SHORT_565_BE
452#define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
453#define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_BE
454#define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_be
455#define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_be
456#define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_be
457#define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_be
458#include "jdmrg565.c"
459#undef PACK_SHORT_565
460#undef PACK_TWO_PIXELS
461#undef WRITE_TWO_PIXELS
462#undef h2v1_merged_upsample_565_internal
463#undef h2v1_merged_upsample_565D_internal
464#undef h2v2_merged_upsample_565_internal
465#undef h2v2_merged_upsample_565D_internal
466
467
468static INLINE boolean is_big_endian(void)
469{
470 int test_value = 1;
471 if (*(char *)&test_value != 1)
472 return TRUE;
473 return FALSE;
474}
475
476
477METHODDEF(void)
478h2v1_merged_upsample_565(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
479 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
480{
481 if (is_big_endian())
482 h2v1_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
483 output_buf);
484 else
485 h2v1_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
486 output_buf);
487}
488
489
490METHODDEF(void)
491h2v1_merged_upsample_565D(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
492 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
493{
494 if (is_big_endian())
495 h2v1_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
496 output_buf);
497 else
498 h2v1_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
499 output_buf);
500}
501
502
503METHODDEF(void)
504h2v2_merged_upsample_565(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
505 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
506{
507 if (is_big_endian())
508 h2v2_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
509 output_buf);
510 else
511 h2v2_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
512 output_buf);
513}
514
515
516METHODDEF(void)
517h2v2_merged_upsample_565D(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
518 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
519{
520 if (is_big_endian())
521 h2v2_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
522 output_buf);
523 else
524 h2v2_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
525 output_buf);
526}
527
528
529/*
530 * Module initialization routine for merged upsampling/color conversion.
531 *
532 * NB: this is called under the conditions determined by use_merged_upsample()
533 * in jdmaster.c. That routine MUST correspond to the actual capabilities
534 * of this module; no safety checks are made here.
535 */
536
537GLOBAL(void)
538jinit_merged_upsampler(j_decompress_ptr cinfo)
539{
540 my_merged_upsample_ptr upsample;
541
542 upsample = (my_merged_upsample_ptr)
543 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
544 sizeof(my_merged_upsampler));
545 cinfo->upsample = (struct jpeg_upsampler *)upsample;
546 upsample->pub.start_pass = start_pass_merged_upsample;
547 upsample->pub.need_context_rows = FALSE;
548
549 upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
550
551 if (cinfo->max_v_samp_factor == 2) {
552 upsample->pub.upsample = merged_2v_upsample;
553 if (jsimd_can_h2v2_merged_upsample())
554 upsample->upmethod = jsimd_h2v2_merged_upsample;
555 else
556 upsample->upmethod = h2v2_merged_upsample;
557 if (cinfo->out_color_space == JCS_RGB565) {
558 if (cinfo->dither_mode != JDITHER_NONE) {
559 upsample->upmethod = h2v2_merged_upsample_565D;
560 } else {
561 upsample->upmethod = h2v2_merged_upsample_565;
562 }
563 }
564 /* Allocate a spare row buffer */
565 upsample->spare_row = (JSAMPROW)
566 (*cinfo->mem->alloc_large) ((j_common_ptr)cinfo, JPOOL_IMAGE,
567 (size_t)(upsample->out_row_width * sizeof(JSAMPLE)));
568 } else {
569 upsample->pub.upsample = merged_1v_upsample;
570 if (jsimd_can_h2v1_merged_upsample())
571 upsample->upmethod = jsimd_h2v1_merged_upsample;
572 else
573 upsample->upmethod = h2v1_merged_upsample;
574 if (cinfo->out_color_space == JCS_RGB565) {
575 if (cinfo->dither_mode != JDITHER_NONE) {
576 upsample->upmethod = h2v1_merged_upsample_565D;
577 } else {
578 upsample->upmethod = h2v1_merged_upsample_565;
579 }
580 }
581 /* No spare row needed */
582 upsample->spare_row = NULL;
583 }
584
585 build_ycc_rgb_table(cinfo);
586}
587
588#endif /* UPSAMPLE_MERGING_SUPPORTED */
589