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