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, JSAMPIMAGE input_buf,
252 JDIMENSION *in_row_group_ctr,
253 JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
254 JDIMENSION *out_row_ctr, 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, 1,
267 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, JSAMPIMAGE input_buf,
303 JDIMENSION *in_row_group_ctr,
304 JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
305 JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
306 /* 1:1 vertical sampling case: much easier, never need a spare row. */
307 {
308 my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
309
310 /* Just do the upsampling. */
311 (*upsample->upmethod) (cinfo, input_buf, *in_row_group_ctr,
312 output_buf + *out_row_ctr);
313 /* Adjust counts */
314 (*out_row_ctr)++;
315 (*in_row_group_ctr)++;
316 }
317
318
319 /*
320 * These are the routines invoked by the control routines to do
321 * the actual upsampling/conversion. One row group is processed per call.
322 *
323 * Note: since we may be writing directly into application-supplied buffers,
324 * we have to be honest about the output width; we can't assume the buffer
325 * has been rounded up to an even width.
326 */
327
328
329 /*
330 * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
331 */
332
333 METHODDEF(void)
h2v1_merged_upsample(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)334 h2v1_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
335 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
336 {
337 switch (cinfo->out_color_space) {
338 case JCS_EXT_RGB:
339 extrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
340 output_buf);
341 break;
342 case JCS_EXT_RGBX:
343 case JCS_EXT_RGBA:
344 extrgbx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
345 output_buf);
346 break;
347 case JCS_EXT_BGR:
348 extbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
349 output_buf);
350 break;
351 case JCS_EXT_BGRX:
352 case JCS_EXT_BGRA:
353 extbgrx_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
354 output_buf);
355 break;
356 case JCS_EXT_XBGR:
357 case JCS_EXT_ABGR:
358 extxbgr_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
359 output_buf);
360 break;
361 case JCS_EXT_XRGB:
362 case JCS_EXT_ARGB:
363 extxrgb_h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
364 output_buf);
365 break;
366 default:
367 h2v1_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
368 output_buf);
369 break;
370 }
371 }
372
373
374 /*
375 * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
376 */
377
378 METHODDEF(void)
h2v2_merged_upsample(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)379 h2v2_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
380 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
381 {
382 switch (cinfo->out_color_space) {
383 case JCS_EXT_RGB:
384 extrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
385 output_buf);
386 break;
387 case JCS_EXT_RGBX:
388 case JCS_EXT_RGBA:
389 extrgbx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
390 output_buf);
391 break;
392 case JCS_EXT_BGR:
393 extbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
394 output_buf);
395 break;
396 case JCS_EXT_BGRX:
397 case JCS_EXT_BGRA:
398 extbgrx_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
399 output_buf);
400 break;
401 case JCS_EXT_XBGR:
402 case JCS_EXT_ABGR:
403 extxbgr_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
404 output_buf);
405 break;
406 case JCS_EXT_XRGB:
407 case JCS_EXT_ARGB:
408 extxrgb_h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
409 output_buf);
410 break;
411 default:
412 h2v2_merged_upsample_internal(cinfo, input_buf, in_row_group_ctr,
413 output_buf);
414 break;
415 }
416 }
417
418
419 /*
420 * RGB565 conversion
421 */
422
423 #define PACK_SHORT_565_LE(r, g, b) ((((r) << 8) & 0xF800) | \
424 (((g) << 3) & 0x7E0) | ((b) >> 3))
425 #define PACK_SHORT_565_BE(r, g, b) (((r) & 0xF8) | ((g) >> 5) | \
426 (((g) << 11) & 0xE000) | \
427 (((b) << 5) & 0x1F00))
428
429 #define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l)
430 #define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r)
431
432 #define WRITE_TWO_PIXELS_LE(addr, pixels) { \
433 ((INT16 *)(addr))[0] = (INT16)(pixels); \
434 ((INT16 *)(addr))[1] = (INT16)((pixels) >> 16); \
435 }
436 #define WRITE_TWO_PIXELS_BE(addr, pixels) { \
437 ((INT16 *)(addr))[1] = (INT16)(pixels); \
438 ((INT16 *)(addr))[0] = (INT16)((pixels) >> 16); \
439 }
440
441 #define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF))
442 #define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1))
443 #define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF))
444
445
446 /* Declarations for ordered dithering
447 *
448 * We use a 4x4 ordered dither array packed into 32 bits. This array is
449 * sufficient for dithering RGB888 to RGB565.
450 */
451
452 #define DITHER_MASK 0x3
453 #define DITHER_ROTATE(x) ((((x) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF))
454 static const JLONG dither_matrix[4] = {
455 0x0008020A,
456 0x0C040E06,
457 0x030B0109,
458 0x0F070D05
459 };
460
461
462 /* Include inline routines for RGB565 conversion */
463
464 #define PACK_SHORT_565 PACK_SHORT_565_LE
465 #define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE
466 #define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_LE
467 #define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_le
468 #define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_le
469 #define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_le
470 #define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_le
471 #include "jdmrg565.c"
472 #undef PACK_SHORT_565
473 #undef PACK_TWO_PIXELS
474 #undef WRITE_TWO_PIXELS
475 #undef h2v1_merged_upsample_565_internal
476 #undef h2v1_merged_upsample_565D_internal
477 #undef h2v2_merged_upsample_565_internal
478 #undef h2v2_merged_upsample_565D_internal
479
480 #define PACK_SHORT_565 PACK_SHORT_565_BE
481 #define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE
482 #define WRITE_TWO_PIXELS WRITE_TWO_PIXELS_BE
483 #define h2v1_merged_upsample_565_internal h2v1_merged_upsample_565_be
484 #define h2v1_merged_upsample_565D_internal h2v1_merged_upsample_565D_be
485 #define h2v2_merged_upsample_565_internal h2v2_merged_upsample_565_be
486 #define h2v2_merged_upsample_565D_internal h2v2_merged_upsample_565D_be
487 #include "jdmrg565.c"
488 #undef PACK_SHORT_565
489 #undef PACK_TWO_PIXELS
490 #undef WRITE_TWO_PIXELS
491 #undef h2v1_merged_upsample_565_internal
492 #undef h2v1_merged_upsample_565D_internal
493 #undef h2v2_merged_upsample_565_internal
494 #undef h2v2_merged_upsample_565D_internal
495
496
is_big_endian(void)497 static INLINE boolean is_big_endian(void)
498 {
499 int test_value = 1;
500 if (*(char *)&test_value != 1)
501 return TRUE;
502 return FALSE;
503 }
504
505
506 METHODDEF(void)
h2v1_merged_upsample_565(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)507 h2v1_merged_upsample_565(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
508 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
509 {
510 if (is_big_endian())
511 h2v1_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
512 output_buf);
513 else
514 h2v1_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
515 output_buf);
516 }
517
518
519 METHODDEF(void)
h2v1_merged_upsample_565D(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)520 h2v1_merged_upsample_565D(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
521 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
522 {
523 if (is_big_endian())
524 h2v1_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
525 output_buf);
526 else
527 h2v1_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
528 output_buf);
529 }
530
531
532 METHODDEF(void)
h2v2_merged_upsample_565(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)533 h2v2_merged_upsample_565(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
534 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
535 {
536 if (is_big_endian())
537 h2v2_merged_upsample_565_be(cinfo, input_buf, in_row_group_ctr,
538 output_buf);
539 else
540 h2v2_merged_upsample_565_le(cinfo, input_buf, in_row_group_ctr,
541 output_buf);
542 }
543
544
545 METHODDEF(void)
h2v2_merged_upsample_565D(j_decompress_ptr cinfo,JSAMPIMAGE input_buf,JDIMENSION in_row_group_ctr,JSAMPARRAY output_buf)546 h2v2_merged_upsample_565D(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
547 JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)
548 {
549 if (is_big_endian())
550 h2v2_merged_upsample_565D_be(cinfo, input_buf, in_row_group_ctr,
551 output_buf);
552 else
553 h2v2_merged_upsample_565D_le(cinfo, input_buf, in_row_group_ctr,
554 output_buf);
555 }
556
557
558 /*
559 * Module initialization routine for merged upsampling/color conversion.
560 *
561 * NB: this is called under the conditions determined by use_merged_upsample()
562 * in jdmaster.c. That routine MUST correspond to the actual capabilities
563 * of this module; no safety checks are made here.
564 */
565
566 GLOBAL(void)
jinit_merged_upsampler(j_decompress_ptr cinfo)567 jinit_merged_upsampler(j_decompress_ptr cinfo)
568 {
569 my_upsample_ptr upsample;
570
571 upsample = (my_upsample_ptr)
572 (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
573 sizeof(my_upsampler));
574 cinfo->upsample = (struct jpeg_upsampler *)upsample;
575 upsample->pub.start_pass = start_pass_merged_upsample;
576 upsample->pub.need_context_rows = FALSE;
577
578 upsample->out_row_width = cinfo->output_width * cinfo->out_color_components;
579
580 if (cinfo->max_v_samp_factor == 2) {
581 upsample->pub.upsample = merged_2v_upsample;
582 if (jsimd_can_h2v2_merged_upsample())
583 upsample->upmethod = jsimd_h2v2_merged_upsample;
584 else
585 upsample->upmethod = h2v2_merged_upsample;
586 if (cinfo->out_color_space == JCS_RGB565) {
587 if (cinfo->dither_mode != JDITHER_NONE) {
588 upsample->upmethod = h2v2_merged_upsample_565D;
589 } else {
590 upsample->upmethod = h2v2_merged_upsample_565;
591 }
592 }
593 /* Allocate a spare row buffer */
594 upsample->spare_row = (JSAMPROW)
595 (*cinfo->mem->alloc_large) ((j_common_ptr)cinfo, JPOOL_IMAGE,
596 (size_t)(upsample->out_row_width * sizeof(JSAMPLE)));
597 } else {
598 upsample->pub.upsample = merged_1v_upsample;
599 if (jsimd_can_h2v1_merged_upsample())
600 upsample->upmethod = jsimd_h2v1_merged_upsample;
601 else
602 upsample->upmethod = h2v1_merged_upsample;
603 if (cinfo->out_color_space == JCS_RGB565) {
604 if (cinfo->dither_mode != JDITHER_NONE) {
605 upsample->upmethod = h2v1_merged_upsample_565D;
606 } else {
607 upsample->upmethod = h2v1_merged_upsample_565;
608 }
609 }
610 /* No spare row needed */
611 upsample->spare_row = NULL;
612 }
613
614 build_ycc_rgb_table(cinfo);
615 }
616
617 #endif /* UPSAMPLE_MERGING_SUPPORTED */
618