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 <ossman@cendio.se> for Cendio AB
8 * Copyright (C) 2009, 2011, 2014-2015, 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 "jsimd.h"
44 #include "jconfigint.h"
45
46 #ifdef UPSAMPLE_MERGING_SUPPORTED
47
48
49 /* Private subobject */
50
51 typedef struct {
52 struct jpeg_upsampler pub; /* public fields */
53
54 /* Pointer to routine to do actual upsampling/conversion of one row group */
55 void (*upmethod) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
56 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf);
57
58 /* Private state for YCC->RGB conversion */
59 int *Cr_r_tab; /* => table for Cr to R conversion */
60 int *Cb_b_tab; /* => table for Cb to B conversion */
61 JLONG *Cr_g_tab; /* => table for Cr to G conversion */
62 JLONG *Cb_g_tab; /* => table for Cb to G conversion */
63
64 /* For 2:1 vertical sampling, we produce two output rows at a time.
65 * We need a "spare" row buffer to hold the second output row if the
66 * application provides just a one-row buffer; we also use the spare
67 * to discard the dummy last row if the image height is odd.
68 */
69 JSAMPROW spare_row;
70 boolean spare_full; /* T if spare buffer is occupied */
71
72 JDIMENSION out_row_width; /* samples per output row */
73 JDIMENSION rows_to_go; /* counts rows remaining in image */
74 } my_upsampler;
75
76 typedef my_upsampler *my_upsample_ptr;
77
78 #define SCALEBITS 16 /* speediest right-shift on some machines */
79 #define ONE_HALF ((JLONG) 1 << (SCALEBITS-1))
80 #define FIX(x) ((JLONG) ((x) * (1L<<SCALEBITS) + 0.5))
81
82
83 /* Include inline routines for colorspace extensions */
84
85 #include "jdmrgext.c"
86 #undef RGB_RED
87 #undef RGB_GREEN
88 #undef RGB_BLUE
89 #undef RGB_PIXELSIZE
90
91 #define RGB_RED EXT_RGB_RED
92 #define RGB_GREEN EXT_RGB_GREEN
93 #define RGB_BLUE EXT_RGB_BLUE
94 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
95 #define h2v1_merged_upsample_internal extrgb_h2v1_merged_upsample_internal
96 #define h2v2_merged_upsample_internal extrgb_h2v2_merged_upsample_internal
97 #include "jdmrgext.c"
98 #undef RGB_RED
99 #undef RGB_GREEN
100 #undef RGB_BLUE
101 #undef RGB_PIXELSIZE
102 #undef h2v1_merged_upsample_internal
103 #undef h2v2_merged_upsample_internal
104
105 #define RGB_RED EXT_RGBX_RED
106 #define RGB_GREEN EXT_RGBX_GREEN
107 #define RGB_BLUE EXT_RGBX_BLUE
108 #define RGB_ALPHA 3
109 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
110 #define h2v1_merged_upsample_internal extrgbx_h2v1_merged_upsample_internal
111 #define h2v2_merged_upsample_internal extrgbx_h2v2_merged_upsample_internal
112 #include "jdmrgext.c"
113 #undef RGB_RED
114 #undef RGB_GREEN
115 #undef RGB_BLUE
116 #undef RGB_ALPHA
117 #undef RGB_PIXELSIZE
118 #undef h2v1_merged_upsample_internal
119 #undef h2v2_merged_upsample_internal
120
121 #define RGB_RED EXT_BGR_RED
122 #define RGB_GREEN EXT_BGR_GREEN
123 #define RGB_BLUE EXT_BGR_BLUE
124 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
125 #define h2v1_merged_upsample_internal extbgr_h2v1_merged_upsample_internal
126 #define h2v2_merged_upsample_internal extbgr_h2v2_merged_upsample_internal
127 #include "jdmrgext.c"
128 #undef RGB_RED
129 #undef RGB_GREEN
130 #undef RGB_BLUE
131 #undef RGB_PIXELSIZE
132 #undef h2v1_merged_upsample_internal
133 #undef h2v2_merged_upsample_internal
134
135 #define RGB_RED EXT_BGRX_RED
136 #define RGB_GREEN EXT_BGRX_GREEN
137 #define RGB_BLUE EXT_BGRX_BLUE
138 #define RGB_ALPHA 3
139 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
140 #define h2v1_merged_upsample_internal extbgrx_h2v1_merged_upsample_internal
141 #define h2v2_merged_upsample_internal extbgrx_h2v2_merged_upsample_internal
142 #include "jdmrgext.c"
143 #undef RGB_RED
144 #undef RGB_GREEN
145 #undef RGB_BLUE
146 #undef RGB_ALPHA
147 #undef RGB_PIXELSIZE
148 #undef h2v1_merged_upsample_internal
149 #undef h2v2_merged_upsample_internal
150
151 #define RGB_RED EXT_XBGR_RED
152 #define RGB_GREEN EXT_XBGR_GREEN
153 #define RGB_BLUE EXT_XBGR_BLUE
154 #define RGB_ALPHA 0
155 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
156 #define h2v1_merged_upsample_internal extxbgr_h2v1_merged_upsample_internal
157 #define h2v2_merged_upsample_internal extxbgr_h2v2_merged_upsample_internal
158 #include "jdmrgext.c"
159 #undef RGB_RED
160 #undef RGB_GREEN
161 #undef RGB_BLUE
162 #undef RGB_ALPHA
163 #undef RGB_PIXELSIZE
164 #undef h2v1_merged_upsample_internal
165 #undef h2v2_merged_upsample_internal
166
167 #define RGB_RED EXT_XRGB_RED
168 #define RGB_GREEN EXT_XRGB_GREEN
169 #define RGB_BLUE EXT_XRGB_BLUE
170 #define RGB_ALPHA 0
171 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
172 #define h2v1_merged_upsample_internal extxrgb_h2v1_merged_upsample_internal
173 #define h2v2_merged_upsample_internal extxrgb_h2v2_merged_upsample_internal
174 #include "jdmrgext.c"
175 #undef RGB_RED
176 #undef RGB_GREEN
177 #undef RGB_BLUE
178 #undef RGB_ALPHA
179 #undef RGB_PIXELSIZE
180 #undef h2v1_merged_upsample_internal
181 #undef h2v2_merged_upsample_internal
182
183
184 /*
185 * Initialize tables for YCC->RGB colorspace conversion.
186 * This is taken directly from jdcolor.c; see that file for more info.
187 */
188
189 LOCAL(void)
build_ycc_rgb_table(j_decompress_ptr cinfo)190 build_ycc_rgb_table (j_decompress_ptr cinfo)
191 {
192 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
193 int i;
194 JLONG x;
195 SHIFT_TEMPS
196
197 upsample->Cr_r_tab = (int *)
198 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
199 (MAXJSAMPLE+1) * sizeof(int));
200 upsample->Cb_b_tab = (int *)
201 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
202 (MAXJSAMPLE+1) * sizeof(int));
203 upsample->Cr_g_tab = (JLONG *)
204 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
205 (MAXJSAMPLE+1) * sizeof(JLONG));
206 upsample->Cb_g_tab = (JLONG *)
207 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
208 (MAXJSAMPLE+1) * sizeof(JLONG));
209
210 for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
211 /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
212 /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
213 /* Cr=>R value is nearest int to 1.40200 * x */
214 upsample->Cr_r_tab[i] = (int)
215 RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
216 /* Cb=>B value is nearest int to 1.77200 * x */
217 upsample->Cb_b_tab[i] = (int)
218 RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
219 /* Cr=>G value is scaled-up -0.71414 * x */
220 upsample->Cr_g_tab[i] = (- FIX(0.71414)) * x;
221 /* Cb=>G value is scaled-up -0.34414 * x */
222 /* We also add in ONE_HALF so that need not do it in inner loop */
223 upsample->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
224 }
225 }
226
227
228 /*
229 * Initialize for an upsampling pass.
230 */
231
232 METHODDEF(void)
start_pass_merged_upsample(j_decompress_ptr cinfo)233 start_pass_merged_upsample (j_decompress_ptr cinfo)
234 {
235 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
236
237 /* Mark the spare buffer empty */
238 upsample->spare_full = FALSE;
239 /* Initialize total-height counter for detecting bottom of image */
240 upsample->rows_to_go = cinfo->output_height;
241 }
242
243
244 /*
245 * Control routine to do upsampling (and color conversion).
246 *
247 * The control routine just handles the row buffering considerations.
248 */
249
250 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)251 merged_2v_upsample (j_decompress_ptr cinfo,
252 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
253 JDIMENSION in_row_groups_avail,
254 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
255 JDIMENSION out_rows_avail)
256 /* 2:1 vertical sampling case: may need a spare row. */
257 {
258 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
259 JSAMPROW work_ptrs[2];
260 JDIMENSION num_rows; /* number of rows returned to caller */
261
262 if (upsample->spare_full) {
263 /* If we have a spare row saved from a previous cycle, just return it. */
264 JDIMENSION size = upsample->out_row_width;
265 if (cinfo->out_color_space == JCS_RGB565)
266 size = cinfo->output_width * 2;
267 jcopy_sample_rows(& upsample->spare_row, 0, output_buf + *out_row_ctr, 0,
268 1, size);
269 num_rows = 1;
270 upsample->spare_full = FALSE;
271 } else {
272 /* Figure number of rows to return to caller. */
273 num_rows = 2;
274 /* Not more than the distance to the end of the image. */
275 if (num_rows > upsample->rows_to_go)
276 num_rows = upsample->rows_to_go;
277 /* And not more than what the client can accept: */
278 out_rows_avail -= *out_row_ctr;
279 if (num_rows > out_rows_avail)
280 num_rows = out_rows_avail;
281 /* Create output pointer array for upsampler. */
282 work_ptrs[0] = output_buf[*out_row_ctr];
283 if (num_rows > 1) {
284 work_ptrs[1] = output_buf[*out_row_ctr + 1];
285 } else {
286 work_ptrs[1] = upsample->spare_row;
287 upsample->spare_full = TRUE;
288 }
289 /* Now do the upsampling. */
290 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr, work_ptrs);
291 }
292
293 /* Adjust counts */
294 *out_row_ctr += num_rows;
295 upsample->rows_to_go -= num_rows;
296 /* When the buffer is emptied, declare this input row group consumed */
297 if (! upsample->spare_full)
298 (*in_row_group_ctr)++;
299 }
300
301
302 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)303 merged_1v_upsample (j_decompress_ptr cinfo,
304 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
305 JDIMENSION in_row_groups_avail,
306 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
307 JDIMENSION out_rows_avail)
308 /* 1:1 vertical sampling case: much easier, never need a spare row. */
309 {
310 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
311
312 /* Just do the upsampling. */
313 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
314 output_buf + *out_row_ctr);
315 /* Adjust counts */
316 (*out_row_ctr)++;
317 (*in_row_group_ctr)++;
318 }
319
320
321 /*
322 * These are the routines invoked by the control routines to do
323 * the actual upsampling/conversion. One row group is processed per call.
324 *
325 * Note: since we may be writing directly into application-supplied buffers,
326 * we have to be honest about the output width; we can't assume the buffer
327 * has been rounded up to an even width.
328 */
329
330
331 /*
332 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
333 */
334
335 METHODDEF(void)
h2v1_merged_upsample(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)336 h2v1_merged_upsample (j_decompress_ptr cinfo,
337 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
338 JSAMPARRAY output_buf)
339 {
340 switch (cinfo->out_color_space) {
341 case JCS_EXT_RGB:
342 extrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
343 output_buf);
344 break;
345 case JCS_EXT_RGBX:
346 case JCS_EXT_RGBA:
347 extrgbx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
348 output_buf);
349 break;
350 case JCS_EXT_BGR:
351 extbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
352 output_buf);
353 break;
354 case JCS_EXT_BGRX:
355 case JCS_EXT_BGRA:
356 extbgrx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
357 output_buf);
358 break;
359 case JCS_EXT_XBGR:
360 case JCS_EXT_ABGR:
361 extxbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
362 output_buf);
363 break;
364 case JCS_EXT_XRGB:
365 case JCS_EXT_ARGB:
366 extxrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
367 output_buf);
368 break;
369 default:
370 h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
371 output_buf);
372 break;
373 }
374 }
375
376
377 /*
378 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
379 */
380
381 METHODDEF(void)
h2v2_merged_upsample(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)382 h2v2_merged_upsample (j_decompress_ptr cinfo,
383 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
384 JSAMPARRAY output_buf)
385 {
386 switch (cinfo->out_color_space) {
387 case JCS_EXT_RGB:
388 extrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
389 output_buf);
390 break;
391 case JCS_EXT_RGBX:
392 case JCS_EXT_RGBA:
393 extrgbx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
394 output_buf);
395 break;
396 case JCS_EXT_BGR:
397 extbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
398 output_buf);
399 break;
400 case JCS_EXT_BGRX:
401 case JCS_EXT_BGRA:
402 extbgrx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
403 output_buf);
404 break;
405 case JCS_EXT_XBGR:
406 case JCS_EXT_ABGR:
407 extxbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
408 output_buf);
409 break;
410 case JCS_EXT_XRGB:
411 case JCS_EXT_ARGB:
412 extxrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
413 output_buf);
414 break;
415 default:
416 h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
417 output_buf);
418 break;
419 }
420 }
421
422
423 /*
424 * RGB565 conversion
425 */
426
427 #define PACK_SHORT_565_LE(r, g, b) ((((r) << 8) & 0xF800) | \
428 (((g) << 3) & 0x7E0) | ((b) >> 3))
429 #define PACK_SHORT_565_BE(r, g, b) (((r) & 0xF8) | ((g) >> 5) | \
430 (((g) << 11) & 0xE000) | \
431 (((b) << 5) & 0x1F00))
432
433 #define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
434 #define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
435
436 #define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3)
437
438 #define WRITE_TWO_PIXELS_LE(addr, pixels) { \
439 ((INT16*)(addr))[0] = (INT16)(pixels); \
440 ((INT16*)(addr))[1] = (INT16)((pixels) >> 16); \
441 }
442 #define WRITE_TWO_PIXELS_BE(addr, pixels) { \
443 ((INT16*)(addr))[1] = (INT16)(pixels); \
444 ((INT16*)(addr))[0] = (INT16)((pixels) >> 16); \
445 }
446
447 #define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
448 #define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
449 #define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
450
451
452 /* Declarations for ordered dithering
453 *
454 * We use a 4x4 ordered dither array packed into 32 bits. This array is
455 * sufficent for dithering RGB888 to RGB565.
456 */
457
458 #define DITHER_MASK 0x3
459 #define DITHER_ROTATE(x) ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
460 static const JLONG dither_matrix[4] = {
461 0x0008020A,
462 0x0C040E06,
463 0x030B0109,
464 0x0F070D05
465 };
466
467
468 /* Include inline routines for RGB565 conversion */
469
470 #define PACK_SHORT_565 PACK_SHORT_565_LE
471 #define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
472 #define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_LE
473 #define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_le
474 #define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_le
475 #define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_le
476 #define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_le
477 #include "jdmrg565.c"
478 #undef PACK_SHORT_565
479 #undef PACK_TWO_PIXELS
480 #undef WRITE_TWO_PIXELS
481 #undef h2v1_merged_upsample_565_internal
482 #undef h2v1_merged_upsample_565D_internal
483 #undef h2v2_merged_upsample_565_internal
484 #undef h2v2_merged_upsample_565D_internal
485
486 #define PACK_SHORT_565 PACK_SHORT_565_BE
487 #define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
488 #define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_BE
489 #define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_be
490 #define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_be
491 #define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_be
492 #define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_be
493 #include "jdmrg565.c"
494 #undef PACK_SHORT_565
495 #undef PACK_TWO_PIXELS
496 #undef WRITE_TWO_PIXELS
497 #undef h2v1_merged_upsample_565_internal
498 #undef h2v1_merged_upsample_565D_internal
499 #undef h2v2_merged_upsample_565_internal
500 #undef h2v2_merged_upsample_565D_internal
501
502
is_big_endian(void)503 static INLINE boolean is_big_endian(void)
504 {
505 int test_value = 1;
506 if(*(char *)&test_value != 1)
507 return TRUE;
508 return FALSE;
509 }
510
511
512 METHODDEF(void)
h2v1_merged_upsample_565(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)513 h2v1_merged_upsample_565 (j_decompress_ptr cinfo,
514 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
515 JSAMPARRAY output_buf)
516 {
517 if (is_big_endian())
518 h2v1_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
519 output_buf);
520 else
521 h2v1_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
522 output_buf);
523 }
524
525
526 METHODDEF(void)
h2v1_merged_upsample_565D(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)527 h2v1_merged_upsample_565D (j_decompress_ptr cinfo,
528 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
529 JSAMPARRAY output_buf)
530 {
531 if (is_big_endian())
532 h2v1_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
533 output_buf);
534 else
535 h2v1_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
536 output_buf);
537 }
538
539
540 METHODDEF(void)
h2v2_merged_upsample_565(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)541 h2v2_merged_upsample_565 (j_decompress_ptr cinfo,
542 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
543 JSAMPARRAY output_buf)
544 {
545 if (is_big_endian())
546 h2v2_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
547 output_buf);
548 else
549 h2v2_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
550 output_buf);
551 }
552
553
554 METHODDEF(void)
h2v2_merged_upsample_565D(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)555 h2v2_merged_upsample_565D (j_decompress_ptr cinfo,
556 JSAMPIMAGE input_buf, JDIMENSION in_row_group_ctr,
557 JSAMPARRAY output_buf)
558 {
559 if (is_big_endian())
560 h2v2_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
561 output_buf);
562 else
563 h2v2_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
564 output_buf);
565 }
566
567
568 /*
569 * Module initialization routine for merged upsampling/color conversion.
570 *
571 * NB: this is called under the conditions determined by use_merged_upsample()
572 * in jdmaster.c. That routine MUST correspond to the actual capabilities
573 * of this module; no safety checks are made here.
574 */
575
576 GLOBAL(void)
jinit_merged_upsampler(j_decompress_ptr cinfo)577 jinit_merged_upsampler (j_decompress_ptr cinfo)
578 {
579 my_upsample_ptr upsample;
580
581 upsample = (my_upsample_ptr)
582 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
583 sizeof(my_upsampler));
584 cinfo->upsample = (struct jpeg_upsampler *) upsample;
585 upsample->pub.start_pass = start_pass_merged_upsample;
586 upsample->pub.need_context_rows = FALSE;
587
588 upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
589
590 if (cinfo->max_v_samp_factor == 2) {
591 upsample->pub.upsample = merged_2v_upsample;
592 if (jsimd_can_h2v2_merged_upsample())
593 upsample->upmethod = jsimd_h2v2_merged_upsample;
594 else
595 upsample->upmethod = h2v2_merged_upsample;
596 if (cinfo->out_color_space == JCS_RGB565) {
597 if (cinfo->dither_mode != JDITHER_NONE) {
598 upsample->upmethod = h2v2_merged_upsample_565D;
599 } else {
600 upsample->upmethod = h2v2_merged_upsample_565;
601 }
602 }
603 /* Allocate a spare row buffer */
604 upsample->spare_row = (JSAMPROW)
605 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
606 (size_t) (upsample->out_row_width * sizeof(JSAMPLE)));
607 } else {
608 upsample->pub.upsample = merged_1v_upsample;
609 if (jsimd_can_h2v1_merged_upsample())
610 upsample->upmethod = jsimd_h2v1_merged_upsample;
611 else
612 upsample->upmethod = h2v1_merged_upsample;
613 if (cinfo->out_color_space == JCS_RGB565) {
614 if (cinfo->dither_mode != JDITHER_NONE) {
615 upsample->upmethod = h2v1_merged_upsample_565D;
616 } else {
617 upsample->upmethod = h2v1_merged_upsample_565;
618 }
619 }
620 /* No spare row needed */
621 upsample->spare_row = NULL;
622 }
623
624 build_ycc_rgb_table(cinfo);
625 }
626
627 #endif /* UPSAMPLE_MERGING_SUPPORTED */
628