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 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 * libjpeg-turbo Modifications:
8 * Copyright (C) 2009, 2011, 2014 D. R. Commander.
9 * Copyright (C) 2013, Linaro Limited.
10 * For conditions of distribution and use, see the accompanying README file.
11 *
12 * This file contains code for merged upsampling/color conversion.
13 *
14 * This file combines functions from jdsample.c and jdcolor.c;
15 * read those files first to understand what's going on.
16 *
17 * When the chroma components are to be upsampled by simple replication
18 * (ie, box filtering), we can save some work in color conversion by
19 * calculating all the output pixels corresponding to a pair of chroma
20 * samples at one time. In the conversion equations
21 * R = Y + K1 * Cr
22 * G = Y + K2 * Cb + K3 * Cr
23 * B = Y + K4 * Cb
24 * only the Y term varies among the group of pixels corresponding to a pair
25 * of chroma samples, so the rest of the terms can be calculated just once.
26 * At typical sampling ratios, this eliminates half or three-quarters of the
27 * multiplications needed for color conversion.
28 *
29 * This file currently provides implementations for the following cases:
30 * YCbCr => RGB color conversion only.
31 * Sampling ratios of 2h1v or 2h2v.
32 * No scaling needed at upsample time.
33 * Corner-aligned (non-CCIR601) sampling alignment.
34 * Other special cases could be added, but in most applications these are
35 * the only common cases. (For uncommon cases we fall back on the more
36 * general code in jdsample.c and jdcolor.c.)
37 */
38
39 #define JPEG_INTERNALS
40 #include "jinclude.h"
41 #include "jpeglib.h"
42 #include "jsimd.h"
43 #include "jconfigint.h"
44
45 #ifdef UPSAMPLE_MERGING_SUPPORTED
46
47
48 /* Private subobject */
49
50 typedef struct {
51 struct jpeg_upsampler pub; /* public fields */
52
53 /* Pointer to routine to do actual upsampling/conversion of one row group */
54 void (*upmethod) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
55 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf);
56
57 /* Private state for YCC->RGB conversion */
58 int * Cr_r_tab; /* => table for Cr to R conversion */
59 int * Cb_b_tab; /* => table for Cb to B conversion */
60 INT32 * Cr_g_tab; /* => table for Cr to G conversion */
61 INT32 * Cb_g_tab; /* => table for Cb to G conversion */
62
63 /* For 2:1 vertical sampling, we produce two output rows at a time.
64 * We need a "spare" row buffer to hold the second output row if the
65 * application provides just a one-row buffer; we also use the spare
66 * to discard the dummy last row if the image height is odd.
67 */
68 JSAMPROW spare_row;
69 boolean spare_full; /* T if spare buffer is occupied */
70
71 JDIMENSION out_row_width; /* samples per output row */
72 JDIMENSION rows_to_go; /* counts rows remaining in image */
73 } my_upsampler;
74
75 typedef my_upsampler * my_upsample_ptr;
76
77 #define SCALEBITS 16 /* speediest right-shift on some machines */
78 #define ONE_HALF ((INT32) 1 << (SCALEBITS-1))
79 #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
80
81
82 /* Include inline routines for colorspace extensions */
83
84 #include "jdmrgext.c"
85 #undef RGB_RED
86 #undef RGB_GREEN
87 #undef RGB_BLUE
88 #undef RGB_PIXELSIZE
89
90 #define RGB_RED EXT_RGB_RED
91 #define RGB_GREEN EXT_RGB_GREEN
92 #define RGB_BLUE EXT_RGB_BLUE
93 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
94 #define h2v1_merged_upsample_internal extrgb_h2v1_merged_upsample_internal
95 #define h2v2_merged_upsample_internal extrgb_h2v2_merged_upsample_internal
96 #include "jdmrgext.c"
97 #undef RGB_RED
98 #undef RGB_GREEN
99 #undef RGB_BLUE
100 #undef RGB_PIXELSIZE
101 #undef h2v1_merged_upsample_internal
102 #undef h2v2_merged_upsample_internal
103
104 #define RGB_RED EXT_RGBX_RED
105 #define RGB_GREEN EXT_RGBX_GREEN
106 #define RGB_BLUE EXT_RGBX_BLUE
107 #define RGB_ALPHA 3
108 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
109 #define h2v1_merged_upsample_internal extrgbx_h2v1_merged_upsample_internal
110 #define h2v2_merged_upsample_internal extrgbx_h2v2_merged_upsample_internal
111 #include "jdmrgext.c"
112 #undef RGB_RED
113 #undef RGB_GREEN
114 #undef RGB_BLUE
115 #undef RGB_ALPHA
116 #undef RGB_PIXELSIZE
117 #undef h2v1_merged_upsample_internal
118 #undef h2v2_merged_upsample_internal
119
120 #define RGB_RED EXT_BGR_RED
121 #define RGB_GREEN EXT_BGR_GREEN
122 #define RGB_BLUE EXT_BGR_BLUE
123 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
124 #define h2v1_merged_upsample_internal extbgr_h2v1_merged_upsample_internal
125 #define h2v2_merged_upsample_internal extbgr_h2v2_merged_upsample_internal
126 #include "jdmrgext.c"
127 #undef RGB_RED
128 #undef RGB_GREEN
129 #undef RGB_BLUE
130 #undef RGB_PIXELSIZE
131 #undef h2v1_merged_upsample_internal
132 #undef h2v2_merged_upsample_internal
133
134 #define RGB_RED EXT_BGRX_RED
135 #define RGB_GREEN EXT_BGRX_GREEN
136 #define RGB_BLUE EXT_BGRX_BLUE
137 #define RGB_ALPHA 3
138 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
139 #define h2v1_merged_upsample_internal extbgrx_h2v1_merged_upsample_internal
140 #define h2v2_merged_upsample_internal extbgrx_h2v2_merged_upsample_internal
141 #include "jdmrgext.c"
142 #undef RGB_RED
143 #undef RGB_GREEN
144 #undef RGB_BLUE
145 #undef RGB_ALPHA
146 #undef RGB_PIXELSIZE
147 #undef h2v1_merged_upsample_internal
148 #undef h2v2_merged_upsample_internal
149
150 #define RGB_RED EXT_XBGR_RED
151 #define RGB_GREEN EXT_XBGR_GREEN
152 #define RGB_BLUE EXT_XBGR_BLUE
153 #define RGB_ALPHA 0
154 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
155 #define h2v1_merged_upsample_internal extxbgr_h2v1_merged_upsample_internal
156 #define h2v2_merged_upsample_internal extxbgr_h2v2_merged_upsample_internal
157 #include "jdmrgext.c"
158 #undef RGB_RED
159 #undef RGB_GREEN
160 #undef RGB_BLUE
161 #undef RGB_ALPHA
162 #undef RGB_PIXELSIZE
163 #undef h2v1_merged_upsample_internal
164 #undef h2v2_merged_upsample_internal
165
166 #define RGB_RED EXT_XRGB_RED
167 #define RGB_GREEN EXT_XRGB_GREEN
168 #define RGB_BLUE EXT_XRGB_BLUE
169 #define RGB_ALPHA 0
170 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
171 #define h2v1_merged_upsample_internal extxrgb_h2v1_merged_upsample_internal
172 #define h2v2_merged_upsample_internal extxrgb_h2v2_merged_upsample_internal
173 #include "jdmrgext.c"
174 #undef RGB_RED
175 #undef RGB_GREEN
176 #undef RGB_BLUE
177 #undef RGB_ALPHA
178 #undef RGB_PIXELSIZE
179 #undef h2v1_merged_upsample_internal
180 #undef h2v2_merged_upsample_internal
181
182
183 /*
184 * Initialize tables for YCC->RGB colorspace conversion.
185 * This is taken directly from jdcolor.c; see that file for more info.
186 */
187
188 LOCAL(void)
build_ycc_rgb_table(j_decompress_ptr cinfo)189 build_ycc_rgb_table (j_decompress_ptr cinfo)
190 {
191 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
192 int i;
193 INT32 x;
194 SHIFT_TEMPS
195
196 upsample->Cr_r_tab = (int *)
197 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
198 (MAXJSAMPLE+1) * sizeof(int));
199 upsample->Cb_b_tab = (int *)
200 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
201 (MAXJSAMPLE+1) * sizeof(int));
202 upsample->Cr_g_tab = (INT32 *)
203 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
204 (MAXJSAMPLE+1) * sizeof(INT32));
205 upsample->Cb_g_tab = (INT32 *)
206 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
207 (MAXJSAMPLE+1) * sizeof(INT32));
208
209 for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
210 /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
211 /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
212 /* Cr=>R value is nearest int to 1.40200 * x */
213 upsample->Cr_r_tab[i] = (int)
214 RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
215 /* Cb=>B value is nearest int to 1.77200 * x */
216 upsample->Cb_b_tab[i] = (int)
217 RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
218 /* Cr=>G value is scaled-up -0.71414 * x */
219 upsample->Cr_g_tab[i] = (- FIX(0.71414)) * x;
220 /* Cb=>G value is scaled-up -0.34414 * x */
221 /* We also add in ONE_HALF so that need not do it in inner loop */
222 upsample->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
223 }
224 }
225
226
227 /*
228 * Initialize for an upsampling pass.
229 */
230
231 METHODDEF(void)
start_pass_merged_upsample(j_decompress_ptr cinfo)232 start_pass_merged_upsample (j_decompress_ptr cinfo)
233 {
234 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
235
236 /* Mark the spare buffer empty */
237 upsample->spare_full = FALSE;
238 /* Initialize total-height counter for detecting bottom of image */
239 upsample->rows_to_go = cinfo->output_height;
240 }
241
242
243 /*
244 * Control routine to do upsampling (and color conversion).
245 *
246 * The control routine just handles the row buffering considerations.
247 */
248
249 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)250 merged_2v_upsample (j_decompress_ptr cinfo,
251 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
252 JDIMENSION in_row_groups_avail,
253 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
254 JDIMENSION out_rows_avail)
255 /* 2:1 vertical sampling case: may need a spare row. */
256 {
257 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
258 JSAMPROW work_ptrs[2];
259 JDIMENSION num_rows; /* number of rows returned to caller */
260
261 if (upsample->spare_full) {
262 /* If we have a spare row saved from a previous cycle, just return it. */
263 JDIMENSION size = upsample->out_row_width;
264 if (cinfo->out_color_space == JCS_RGB565)
265 size = cinfo->output_width * 2;
266 jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0,
267 1, size);
268 num_rows = 1;
269 upsample->spare_full = FALSE;
270 } else {
271 /* Figure number of rows to return to caller. */
272 num_rows = 2;
273 /* Not more than the distance to the end of the image. */
274 if (num_rows > upsample->rows_to_go)
275 num_rows = upsample->rows_to_go;
276 /* And not more than what the client can accept: */
277 out_rows_avail -= *out_row_ctr;
278 if (num_rows > out_rows_avail)
279 num_rows = out_rows_avail;
280 /* Create output pointer array for upsampler. */
281 work_ptrs[0] = output_buf[*out_row_ctr];
282 if (num_rows > 1) {
283 work_ptrs[1] = output_buf[*out_row_ctr + 1];
284 } else {
285 work_ptrs[1] = upsample->spare_row;
286 upsample->spare_full = TRUE;
287 }
288 /* Now do the upsampling. */
289 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
290 }
291
292 /* Adjust counts */
293 *out_row_ctr += num_rows;
294 upsample->rows_to_go -= num_rows;
295 /* When the buffer is emptied, declare this input row group consumed */
296 if (! upsample->spare_full)
297 (*in_row_group_ctr)++;
298 }
299
300
301 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)302 merged_1v_upsample (j_decompress_ptr cinfo,
303 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
304 JDIMENSION in_row_groups_avail,
305 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
306 JDIMENSION out_rows_avail)
307 /* 1:1 vertical sampling case: much easier, never need a spare row. */
308 {
309 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
310
311 /* Just do the upsampling. */
312 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
313 output_buf + *out_row_ctr);
314 /* Adjust counts */
315 (*out_row_ctr)++;
316 (*in_row_group_ctr)++;
317 }
318
319
320 /*
321 * These are the routines invoked by the control routines to do
322 * the actual upsampling/conversion. One row group is processed per call.
323 *
324 * Note: since we may be writing directly into application-supplied buffers,
325 * we have to be honest about the output width; we can't assume the buffer
326 * has been rounded up to an even width.
327 */
328
329
330 /*
331 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
332 */
333
334 METHODDEF(void)
h2v1_merged_upsample(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)335 h2v1_merged_upsample (j_decompress_ptr cinfo,
336 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
337 JSAMPARRAY output_buf)
338 {
339 switch (cinfo->out_color_space) {
340 case JCS_EXT_RGB:
341 extrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
342 output_buf);
343 break;
344 case JCS_EXT_RGBX:
345 case JCS_EXT_RGBA:
346 extrgbx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
347 output_buf);
348 break;
349 case JCS_EXT_BGR:
350 extbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
351 output_buf);
352 break;
353 case JCS_EXT_BGRX:
354 case JCS_EXT_BGRA:
355 extbgrx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
356 output_buf);
357 break;
358 case JCS_EXT_XBGR:
359 case JCS_EXT_ABGR:
360 extxbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
361 output_buf);
362 break;
363 case JCS_EXT_XRGB:
364 case JCS_EXT_ARGB:
365 extxrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
366 output_buf);
367 break;
368 default:
369 h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
370 output_buf);
371 break;
372 }
373 }
374
375
376 /*
377 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
378 */
379
380 METHODDEF(void)
h2v2_merged_upsample(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)381 h2v2_merged_upsample (j_decompress_ptr cinfo,
382 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
383 JSAMPARRAY output_buf)
384 {
385 switch (cinfo->out_color_space) {
386 case JCS_EXT_RGB:
387 extrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
388 output_buf);
389 break;
390 case JCS_EXT_RGBX:
391 case JCS_EXT_RGBA:
392 extrgbx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
393 output_buf);
394 break;
395 case JCS_EXT_BGR:
396 extbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
397 output_buf);
398 break;
399 case JCS_EXT_BGRX:
400 case JCS_EXT_BGRA:
401 extbgrx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
402 output_buf);
403 break;
404 case JCS_EXT_XBGR:
405 case JCS_EXT_ABGR:
406 extxbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
407 output_buf);
408 break;
409 case JCS_EXT_XRGB:
410 case JCS_EXT_ARGB:
411 extxrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
412 output_buf);
413 break;
414 default:
415 h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
416 output_buf);
417 break;
418 }
419 }
420
421
422 /*
423 * RGB565 conversion
424 */
425
426 #define PACK_SHORT_565_LE(r, g, b) ((((r) << 8) & 0xF800) | \
427 (((g) << 3) & 0x7E0) | ((b) >> 3))
428 #define PACK_SHORT_565_BE(r, g, b) (((r) & 0xF8) | ((g) >> 5) | \
429 (((g) << 11) & 0xE000) | \
430 (((b) << 5) & 0x1F00))
431
432 #define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
433 #define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
434
435 #define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3)
436
437 #define WRITE_TWO_PIXELS_LE(addr, pixels) { \
438 ((INT16*)(addr))[0] = (pixels); \
439 ((INT16*)(addr))[1] = (pixels) >> 16; \
440 }
441 #define WRITE_TWO_PIXELS_BE(addr, pixels) { \
442 ((INT16*)(addr))[1] = (pixels); \
443 ((INT16*)(addr))[0] = (pixels) >> 16; \
444 }
445
446 #define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
447 #define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
448 #define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
449
450
451 /* Declarations for ordered dithering
452 *
453 * We use a 4x4 ordered dither array packed into 32 bits. This array is
454 * sufficent for dithering RGB888 to RGB565.
455 */
456
457 #define DITHER_MASK 0x3
458 #define DITHER_ROTATE(x) (((x) << 24) | (((x) >> 8) & 0x00FFFFFF))
459 static const INT32 dither_matrix[4] = {
460 0x0008020A,
461 0x0C040E06,
462 0x030B0109,
463 0x0F070D05
464 };
465
466
467 /* Include inline routines for RGB565 conversion */
468
469 #define PACK_SHORT_565 PACK_SHORT_565_LE
470 #define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
471 #define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_LE
472 #define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_le
473 #define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_le
474 #define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_le
475 #define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_le
476 #include "jdmrg565.c"
477 #undef PACK_SHORT_565
478 #undef PACK_TWO_PIXELS
479 #undef WRITE_TWO_PIXELS
480 #undef h2v1_merged_upsample_565_internal
481 #undef h2v1_merged_upsample_565D_internal
482 #undef h2v2_merged_upsample_565_internal
483 #undef h2v2_merged_upsample_565D_internal
484
485 #define PACK_SHORT_565 PACK_SHORT_565_BE
486 #define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
487 #define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_BE
488 #define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_be
489 #define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_be
490 #define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_be
491 #define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_be
492 #include "jdmrg565.c"
493 #undef PACK_SHORT_565
494 #undef PACK_TWO_PIXELS
495 #undef WRITE_TWO_PIXELS
496 #undef h2v1_merged_upsample_565_internal
497 #undef h2v1_merged_upsample_565D_internal
498 #undef h2v2_merged_upsample_565_internal
499 #undef h2v2_merged_upsample_565D_internal
500
501
is_big_endian(void)502 static INLINE boolean is_big_endian(void)
503 {
504 int test_value = 1;
505 if(*(char *)&test_value != 1)
506 return TRUE;
507 return FALSE;
508 }
509
510
511 METHODDEF(void)
h2v1_merged_upsample_565(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)512 h2v1_merged_upsample_565 (j_decompress_ptr cinfo,
513 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
514 JSAMPARRAY output_buf)
515 {
516 if (is_big_endian())
517 h2v1_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
518 output_buf);
519 else
520 h2v1_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
521 output_buf);
522 }
523
524
525 METHODDEF(void)
h2v1_merged_upsample_565D(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)526 h2v1_merged_upsample_565D (j_decompress_ptr cinfo,
527 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
528 JSAMPARRAY output_buf)
529 {
530 if (is_big_endian())
531 h2v1_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
532 output_buf);
533 else
534 h2v1_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
535 output_buf);
536 }
537
538
539 METHODDEF(void)
h2v2_merged_upsample_565(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)540 h2v2_merged_upsample_565 (j_decompress_ptr cinfo,
541 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
542 JSAMPARRAY output_buf)
543 {
544 if (is_big_endian())
545 h2v2_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
546 output_buf);
547 else
548 h2v2_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
549 output_buf);
550 }
551
552
553 METHODDEF(void)
h2v2_merged_upsample_565D(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)554 h2v2_merged_upsample_565D (j_decompress_ptr cinfo,
555 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
556 JSAMPARRAY output_buf)
557 {
558 if (is_big_endian())
559 h2v2_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
560 output_buf);
561 else
562 h2v2_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
563 output_buf);
564 }
565
566
567 /*
568 * Module initialization routine for merged upsampling/color conversion.
569 *
570 * NB: this is called under the conditions determined by use_merged_upsample()
571 * in jdmaster.c. That routine MUST correspond to the actual capabilities
572 * of this module; no safety checks are made here.
573 */
574
575 GLOBAL(void)
jinit_merged_upsampler(j_decompress_ptr cinfo)576 jinit_merged_upsampler (j_decompress_ptr cinfo)
577 {
578 my_upsample_ptr upsample;
579
580 upsample = (my_upsample_ptr)
581 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
582 sizeof(my_upsampler));
583 cinfo->upsample = (struct jpeg_upsampler *) upsample;
584 upsample->pub.start_pass = start_pass_merged_upsample;
585 upsample->pub.need_context_rows = FALSE;
586
587 upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
588
589 if (cinfo->max_v_samp_factor == 2) {
590 upsample->pub.upsample = merged_2v_upsample;
591 if (jsimd_can_h2v2_merged_upsample())
592 upsample->upmethod = jsimd_h2v2_merged_upsample;
593 else
594 upsample->upmethod = h2v2_merged_upsample;
595 if (cinfo->out_color_space == JCS_RGB565) {
596 if (cinfo->dither_mode != JDITHER_NONE) {
597 upsample->upmethod = h2v2_merged_upsample_565D;
598 } else {
599 upsample->upmethod = h2v2_merged_upsample_565;
600 }
601 }
602 /* Allocate a spare row buffer */
603 upsample->spare_row = (JSAMPROW)
604 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
605 (size_t) (upsample->out_row_width * sizeof(JSAMPLE)));
606 } else {
607 upsample->pub.upsample = merged_1v_upsample;
608 if (jsimd_can_h2v1_merged_upsample())
609 upsample->upmethod = jsimd_h2v1_merged_upsample;
610 else
611 upsample->upmethod = h2v1_merged_upsample;
612 if (cinfo->out_color_space == JCS_RGB565) {
613 if (cinfo->dither_mode != JDITHER_NONE) {
614 upsample->upmethod = h2v1_merged_upsample_565D;
615 } else {
616 upsample->upmethod = h2v1_merged_upsample_565;
617 }
618 }
619 /* No spare row needed */
620 upsample->spare_row = NULL;
621 }
622
623 build_ycc_rgb_table(cinfo);
624 }
625
626 #endif /* UPSAMPLE_MERGING_SUPPORTED */
627