1/*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "include/private/SkColorData.h"
9#include "include/private/SkHalf.h"
10#include "include/private/SkTemplates.h"
11#include "src/codec/SkCodecPriv.h"
12#include "src/codec/SkSwizzler.h"
13#include "src/core/SkOpts.h"
14
15#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
16 #include "include/android/SkAndroidFrameworkUtils.h"
17#endif
18
19static void copy(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
20 const SkPMColor ctable[]) {
21 // This function must not be called if we are sampling. If we are not
22 // sampling, deltaSrc should equal bpp.
23 SkASSERT(deltaSrc == bpp);
24
25 memcpy(dst, src + offset, width * bpp);
26}
27
28static void sample1(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
29 const SkPMColor ctable[]) {
30 src += offset;
31 uint8_t* dst8 = (uint8_t*) dst;
32 for (int x = 0; x < width; x++) {
33 dst8[x] = *src;
34 src += deltaSrc;
35 }
36}
37
38static void sample2(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
39 const SkPMColor ctable[]) {
40 src += offset;
41 uint16_t* dst16 = (uint16_t*) dst;
42 for (int x = 0; x < width; x++) {
43 dst16[x] = *((const uint16_t*) src);
44 src += deltaSrc;
45 }
46}
47
48static void sample4(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
49 const SkPMColor ctable[]) {
50 src += offset;
51 uint32_t* dst32 = (uint32_t*) dst;
52 for (int x = 0; x < width; x++) {
53 dst32[x] = *((const uint32_t*) src);
54 src += deltaSrc;
55 }
56}
57
58static void sample6(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
59 const SkPMColor ctable[]) {
60 src += offset;
61 uint8_t* dst8 = (uint8_t*) dst;
62 for (int x = 0; x < width; x++) {
63 memcpy(dst8, src, 6);
64 dst8 += 6;
65 src += deltaSrc;
66 }
67}
68
69static void sample8(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
70 const SkPMColor ctable[]) {
71 src += offset;
72 uint64_t* dst64 = (uint64_t*) dst;
73 for (int x = 0; x < width; x++) {
74 dst64[x] = *((const uint64_t*) src);
75 src += deltaSrc;
76 }
77}
78
79// kBit
80// These routines exclusively choose between white and black
81
82#define GRAYSCALE_BLACK 0
83#define GRAYSCALE_WHITE 0xFF
84
85
86// same as swizzle_bit_to_index and swizzle_bit_to_n32 except for value assigned to dst[x]
87static void swizzle_bit_to_grayscale(
88 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
89 int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
90
91 uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
92
93 // increment src by byte offset and bitIndex by bit offset
94 src += offset / 8;
95 int bitIndex = offset % 8;
96 uint8_t currByte = *src;
97
98 dst[0] = ((currByte >> (7-bitIndex)) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
99
100 for (int x = 1; x < dstWidth; x++) {
101 int bitOffset = bitIndex + deltaSrc;
102 bitIndex = bitOffset % 8;
103 currByte = *(src += bitOffset / 8);
104 dst[x] = ((currByte >> (7-bitIndex)) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
105 }
106}
107
108#undef GRAYSCALE_BLACK
109#undef GRAYSCALE_WHITE
110
111// same as swizzle_bit_to_grayscale and swizzle_bit_to_index except for value assigned to dst[x]
112static void swizzle_bit_to_n32(
113 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
114 int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
115 SkPMColor* SK_RESTRICT dst = (SkPMColor*) dstRow;
116
117 // increment src by byte offset and bitIndex by bit offset
118 src += offset / 8;
119 int bitIndex = offset % 8;
120 uint8_t currByte = *src;
121
122 dst[0] = ((currByte >> (7 - bitIndex)) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
123
124 for (int x = 1; x < dstWidth; x++) {
125 int bitOffset = bitIndex + deltaSrc;
126 bitIndex = bitOffset % 8;
127 currByte = *(src += bitOffset / 8);
128 dst[x] = ((currByte >> (7 - bitIndex)) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
129 }
130}
131
132#define RGB565_BLACK 0
133#define RGB565_WHITE 0xFFFF
134
135static void swizzle_bit_to_565(
136 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
137 int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
138 uint16_t* SK_RESTRICT dst = (uint16_t*) dstRow;
139
140 // increment src by byte offset and bitIndex by bit offset
141 src += offset / 8;
142 int bitIndex = offset % 8;
143 uint8_t currByte = *src;
144
145 dst[0] = ((currByte >> (7 - bitIndex)) & 1) ? RGB565_WHITE : RGB565_BLACK;
146
147 for (int x = 1; x < dstWidth; x++) {
148 int bitOffset = bitIndex + deltaSrc;
149 bitIndex = bitOffset % 8;
150 currByte = *(src += bitOffset / 8);
151 dst[x] = ((currByte >> (7 - bitIndex)) & 1) ? RGB565_WHITE : RGB565_BLACK;
152 }
153}
154
155#undef RGB565_BLACK
156#undef RGB565_WHITE
157
158static void swizzle_bit_to_f16(
159 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
160 int bpp, int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
161 constexpr uint64_t kWhite = (((uint64_t) SK_Half1) << 0) |
162 (((uint64_t) SK_Half1) << 16) |
163 (((uint64_t) SK_Half1) << 32) |
164 (((uint64_t) SK_Half1) << 48);
165 constexpr uint64_t kBlack = (((uint64_t) 0) << 0) |
166 (((uint64_t) 0) << 16) |
167 (((uint64_t) 0) << 32) |
168 (((uint64_t) SK_Half1) << 48);
169
170 uint64_t* SK_RESTRICT dst = (uint64_t*) dstRow;
171
172 // increment src by byte offset and bitIndex by bit offset
173 src += offset / 8;
174 int bitIndex = offset % 8;
175 uint8_t currByte = *src;
176
177 dst[0] = ((currByte >> (7 - bitIndex)) & 1) ? kWhite : kBlack;
178
179 for (int x = 1; x < dstWidth; x++) {
180 int bitOffset = bitIndex + deltaSrc;
181 bitIndex = bitOffset % 8;
182 currByte = *(src += bitOffset / 8);
183 dst[x] = ((currByte >> (7 - bitIndex)) & 1) ? kWhite : kBlack;
184 }
185}
186
187// kIndex1, kIndex2, kIndex4
188
189static void swizzle_small_index_to_565(
190 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
191 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
192
193 uint16_t* dst = (uint16_t*) dstRow;
194 src += offset / 8;
195 int bitIndex = offset % 8;
196 uint8_t currByte = *src;
197 const uint8_t mask = (1 << bpp) - 1;
198 uint8_t index = (currByte >> (8 - bpp - bitIndex)) & mask;
199 dst[0] = SkPixel32ToPixel16(ctable[index]);
200
201 for (int x = 1; x < dstWidth; x++) {
202 int bitOffset = bitIndex + deltaSrc;
203 bitIndex = bitOffset % 8;
204 currByte = *(src += bitOffset / 8);
205 index = (currByte >> (8 - bpp - bitIndex)) & mask;
206 dst[x] = SkPixel32ToPixel16(ctable[index]);
207 }
208}
209
210static void swizzle_small_index_to_n32(
211 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
212 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
213
214 SkPMColor* dst = (SkPMColor*) dstRow;
215 src += offset / 8;
216 int bitIndex = offset % 8;
217 uint8_t currByte = *src;
218 const uint8_t mask = (1 << bpp) - 1;
219 uint8_t index = (currByte >> (8 - bpp - bitIndex)) & mask;
220 dst[0] = ctable[index];
221
222 for (int x = 1; x < dstWidth; x++) {
223 int bitOffset = bitIndex + deltaSrc;
224 bitIndex = bitOffset % 8;
225 currByte = *(src += bitOffset / 8);
226 index = (currByte >> (8 - bpp - bitIndex)) & mask;
227 dst[x] = ctable[index];
228 }
229}
230
231// kIndex
232
233static void swizzle_index_to_n32(
234 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
235 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
236
237 src += offset;
238 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
239 for (int x = 0; x < dstWidth; x++) {
240 SkPMColor c = ctable[*src];
241 dst[x] = c;
242 src += deltaSrc;
243 }
244}
245
246static void swizzle_index_to_n32_skipZ(
247 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
248 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
249
250 src += offset;
251 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
252 for (int x = 0; x < dstWidth; x++) {
253 SkPMColor c = ctable[*src];
254 if (c != 0) {
255 dst[x] = c;
256 }
257 src += deltaSrc;
258 }
259}
260
261static void swizzle_index_to_565(
262 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
263 int bytesPerPixel, int deltaSrc, int offset, const SkPMColor ctable[]) {
264 src += offset;
265 uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
266 for (int x = 0; x < dstWidth; x++) {
267 dst[x] = SkPixel32ToPixel16(ctable[*src]);
268 src += deltaSrc;
269 }
270}
271
272// kGray
273
274static void swizzle_gray_to_n32(
275 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
276 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
277
278 src += offset;
279 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
280 for (int x = 0; x < dstWidth; x++) {
281 dst[x] = SkPackARGB32NoCheck(0xFF, *src, *src, *src);
282 src += deltaSrc;
283 }
284}
285
286static void fast_swizzle_gray_to_n32(
287 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
288 const SkPMColor ctable[]) {
289
290 // This function must not be called if we are sampling. If we are not
291 // sampling, deltaSrc should equal bpp.
292 SkASSERT(deltaSrc == bpp);
293
294 // Note that there is no need to distinguish between RGB and BGR.
295 // Each color channel will get the same value.
296 SkOpts::gray_to_RGB1((uint32_t*) dst, src + offset, width);
297}
298
299static void swizzle_gray_to_565(
300 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
301 int bytesPerPixel, int deltaSrc, int offset, const SkPMColor ctable[]) {
302
303 src += offset;
304 uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
305 for (int x = 0; x < dstWidth; x++) {
306 dst[x] = SkPack888ToRGB16(src[0], src[0], src[0]);
307 src += deltaSrc;
308 }
309}
310
311// kGrayAlpha
312
313static void swizzle_grayalpha_to_n32_unpremul(
314 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
315 const SkPMColor ctable[]) {
316
317 src += offset;
318 SkPMColor* dst32 = (SkPMColor*) dst;
319 for (int x = 0; x < width; x++) {
320 dst32[x] = SkPackARGB32NoCheck(src[1], src[0], src[0], src[0]);
321 src += deltaSrc;
322 }
323}
324
325static void fast_swizzle_grayalpha_to_n32_unpremul(
326 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
327 const SkPMColor ctable[]) {
328
329 // This function must not be called if we are sampling. If we are not
330 // sampling, deltaSrc should equal bpp.
331 SkASSERT(deltaSrc == bpp);
332
333 // Note that there is no need to distinguish between RGB and BGR.
334 // Each color channel will get the same value.
335 SkOpts::grayA_to_RGBA((uint32_t*) dst, src + offset, width);
336}
337
338static void swizzle_grayalpha_to_n32_premul(
339 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
340 const SkPMColor ctable[]) {
341
342 src += offset;
343 SkPMColor* dst32 = (SkPMColor*) dst;
344 for (int x = 0; x < width; x++) {
345 uint8_t pmgray = SkMulDiv255Round(src[1], src[0]);
346 dst32[x] = SkPackARGB32NoCheck(src[1], pmgray, pmgray, pmgray);
347 src += deltaSrc;
348 }
349}
350
351static void fast_swizzle_grayalpha_to_n32_premul(
352 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
353 const SkPMColor ctable[]) {
354
355 // This function must not be called if we are sampling. If we are not
356 // sampling, deltaSrc should equal bpp.
357 SkASSERT(deltaSrc == bpp);
358
359 // Note that there is no need to distinguish between rgb and bgr.
360 // Each color channel will get the same value.
361 SkOpts::grayA_to_rgbA((uint32_t*) dst, src + offset, width);
362}
363
364static void swizzle_grayalpha_to_a8(void* dst, const uint8_t* src, int width, int bpp,
365 int deltaSrc, int offset, const SkPMColor[]) {
366 src += offset;
367 uint8_t* dst8 = (uint8_t*)dst;
368 for (int x = 0; x < width; ++x) {
369 dst8[x] = src[1]; // src[0] is gray, ignored
370 src += deltaSrc;
371 }
372}
373
374// kBGR
375
376static void swizzle_bgr_to_565(
377 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
378 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
379
380 src += offset;
381 uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
382 for (int x = 0; x < dstWidth; x++) {
383 dst[x] = SkPack888ToRGB16(src[2], src[1], src[0]);
384 src += deltaSrc;
385 }
386}
387
388// kRGB
389
390static void swizzle_rgb_to_rgba(
391 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
392 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
393
394 src += offset;
395 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
396 for (int x = 0; x < dstWidth; x++) {
397 dst[x] = SkPackARGB_as_RGBA(0xFF, src[0], src[1], src[2]);
398 src += deltaSrc;
399 }
400}
401
402static void swizzle_rgb_to_bgra(
403 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
404 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
405
406 src += offset;
407 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
408 for (int x = 0; x < dstWidth; x++) {
409 dst[x] = SkPackARGB_as_BGRA(0xFF, src[0], src[1], src[2]);
410 src += deltaSrc;
411 }
412}
413
414static void fast_swizzle_rgb_to_rgba(
415 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc,
416 int offset, const SkPMColor ctable[]) {
417
418 // This function must not be called if we are sampling. If we are not
419 // sampling, deltaSrc should equal bpp.
420 SkASSERT(deltaSrc == bpp);
421
422 SkOpts::RGB_to_RGB1((uint32_t*) dst, src + offset, width);
423}
424
425static void fast_swizzle_rgb_to_bgra(
426 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc,
427 int offset, const SkPMColor ctable[]) {
428
429 // This function must not be called if we are sampling. If we are not
430 // sampling, deltaSrc should equal bpp.
431 SkASSERT(deltaSrc == bpp);
432
433 SkOpts::RGB_to_BGR1((uint32_t*) dst, src + offset, width);
434}
435
436static void swizzle_rgb_to_565(
437 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
438 int bytesPerPixel, int deltaSrc, int offset, const SkPMColor ctable[]) {
439
440 src += offset;
441 uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
442 for (int x = 0; x < dstWidth; x++) {
443 dst[x] = SkPack888ToRGB16(src[0], src[1], src[2]);
444 src += deltaSrc;
445 }
446}
447
448// kRGBA
449
450static void swizzle_rgba_to_rgba_premul(
451 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
452 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
453
454 src += offset;
455 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
456 for (int x = 0; x < dstWidth; x++) {
457 dst[x] = premultiply_argb_as_rgba(src[3], src[0], src[1], src[2]);
458 src += deltaSrc;
459 }
460}
461
462static void swizzle_rgba_to_bgra_premul(
463 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
464 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
465
466 src += offset;
467 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
468 for (int x = 0; x < dstWidth; x++) {
469 dst[x] = premultiply_argb_as_bgra(src[3], src[0], src[1], src[2]);
470 src += deltaSrc;
471 }
472}
473
474static void fast_swizzle_rgba_to_rgba_premul(
475 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc,
476 int offset, const SkPMColor ctable[]) {
477
478 // This function must not be called if we are sampling. If we are not
479 // sampling, deltaSrc should equal bpp.
480 SkASSERT(deltaSrc == bpp);
481
482 SkOpts::RGBA_to_rgbA((uint32_t*) dst, (const uint32_t*)(src + offset), width);
483}
484
485static void fast_swizzle_rgba_to_bgra_premul(
486 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc,
487 int offset, const SkPMColor ctable[]) {
488
489 // This function must not be called if we are sampling. If we are not
490 // sampling, deltaSrc should equal bpp.
491 SkASSERT(deltaSrc == bpp);
492
493 SkOpts::RGBA_to_bgrA((uint32_t*) dst, (const uint32_t*)(src + offset), width);
494}
495
496static void swizzle_rgba_to_bgra_unpremul(
497 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
498 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
499
500 src += offset;
501 uint32_t* SK_RESTRICT dst = reinterpret_cast<uint32_t*>(dstRow);
502 for (int x = 0; x < dstWidth; x++) {
503 unsigned alpha = src[3];
504 dst[x] = SkPackARGB_as_BGRA(alpha, src[0], src[1], src[2]);
505 src += deltaSrc;
506 }
507}
508
509static void fast_swizzle_rgba_to_bgra_unpremul(
510 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
511 const SkPMColor ctable[]) {
512
513 // This function must not be called if we are sampling. If we are not
514 // sampling, deltaSrc should equal bpp.
515 SkASSERT(deltaSrc == bpp);
516
517 SkOpts::RGBA_to_BGRA((uint32_t*) dst, (const uint32_t*)(src + offset), width);
518}
519
520// 16-bits per component kRGB and kRGBA
521
522static void swizzle_rgb16_to_rgba(
523 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
524 const SkPMColor ctable[]) {
525 auto strip16to8 = [](const uint8_t* ptr) {
526 return 0xFF000000 | (ptr[4] << 16) | (ptr[2] << 8) | ptr[0];
527 };
528
529 src += offset;
530 uint32_t* dst32 = (uint32_t*) dst;
531 for (int x = 0; x < width; x++) {
532 dst32[x] = strip16to8(src);
533 src += deltaSrc;
534 }
535}
536
537static void swizzle_rgb16_to_bgra(
538 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
539 const SkPMColor ctable[]) {
540 auto strip16to8 = [](const uint8_t* ptr) {
541 return 0xFF000000 | (ptr[0] << 16) | (ptr[2] << 8) | ptr[4];
542 };
543
544 src += offset;
545 uint32_t* dst32 = (uint32_t*) dst;
546 for (int x = 0; x < width; x++) {
547 dst32[x] = strip16to8(src);
548 src += deltaSrc;
549 }
550}
551
552static void swizzle_rgb16_to_565(
553 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
554 const SkPMColor ctable[]) {
555 auto strip16to565 = [](const uint8_t* ptr) {
556 return SkPack888ToRGB16(ptr[0], ptr[2], ptr[4]);
557 };
558
559 src += offset;
560 uint16_t* dst16 = (uint16_t*) dst;
561 for (int x = 0; x < width; x++) {
562 dst16[x] = strip16to565(src);
563 src += deltaSrc;
564 }
565}
566
567static void swizzle_rgba16_to_rgba_unpremul(
568 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
569 const SkPMColor ctable[]) {
570 auto strip16to8 = [](const uint8_t* ptr) {
571 return (ptr[6] << 24) | (ptr[4] << 16) | (ptr[2] << 8) | ptr[0];
572 };
573
574 src += offset;
575 uint32_t* dst32 = (uint32_t*) dst;
576 for (int x = 0; x < width; x++) {
577 dst32[x] = strip16to8(src);
578 src += deltaSrc;
579 }
580}
581
582static void swizzle_rgba16_to_rgba_premul(
583 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
584 const SkPMColor ctable[]) {
585 auto stripAndPremul16to8 = [](const uint8_t* ptr) {
586 return premultiply_argb_as_rgba(ptr[6], ptr[0], ptr[2], ptr[4]);
587 };
588
589 src += offset;
590 uint32_t* dst32 = (uint32_t*) dst;
591 for (int x = 0; x < width; x++) {
592 dst32[x] = stripAndPremul16to8(src);
593 src += deltaSrc;
594 }
595}
596
597static void swizzle_rgba16_to_bgra_unpremul(
598 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
599 const SkPMColor ctable[]) {
600 auto strip16to8 = [](const uint8_t* ptr) {
601 return (ptr[6] << 24) | (ptr[0] << 16) | (ptr[2] << 8) | ptr[4];
602 };
603
604 src += offset;
605 uint32_t* dst32 = (uint32_t*) dst;
606 for (int x = 0; x < width; x++) {
607 dst32[x] = strip16to8(src);
608 src += deltaSrc;
609 }
610}
611
612static void swizzle_rgba16_to_bgra_premul(
613 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
614 const SkPMColor ctable[]) {
615 auto stripAndPremul16to8 = [](const uint8_t* ptr) {
616 return premultiply_argb_as_bgra(ptr[6], ptr[0], ptr[2], ptr[4]);
617 };
618
619 src += offset;
620 uint32_t* dst32 = (uint32_t*) dst;
621 for (int x = 0; x < width; x++) {
622 dst32[x] = stripAndPremul16to8(src);
623 src += deltaSrc;
624 }
625}
626
627// kCMYK
628//
629// CMYK is stored as four bytes per pixel.
630//
631// We will implement a crude conversion from CMYK -> RGB using formulas
632// from easyrgb.com.
633//
634// CMYK -> CMY
635// C = C * (1 - K) + K
636// M = M * (1 - K) + K
637// Y = Y * (1 - K) + K
638//
639// libjpeg actually gives us inverted CMYK, so we must subtract the
640// original terms from 1.
641// CMYK -> CMY
642// C = (1 - C) * (1 - (1 - K)) + (1 - K)
643// M = (1 - M) * (1 - (1 - K)) + (1 - K)
644// Y = (1 - Y) * (1 - (1 - K)) + (1 - K)
645//
646// Simplifying the above expression.
647// CMYK -> CMY
648// C = 1 - CK
649// M = 1 - MK
650// Y = 1 - YK
651//
652// CMY -> RGB
653// R = (1 - C) * 255
654// G = (1 - M) * 255
655// B = (1 - Y) * 255
656//
657// Therefore the full conversion is below. This can be verified at
658// www.rapidtables.com (assuming inverted CMYK).
659// CMYK -> RGB
660// R = C * K * 255
661// G = M * K * 255
662// B = Y * K * 255
663//
664// As a final note, we have treated the CMYK values as if they were on
665// a scale from 0-1, when in fact they are 8-bit ints scaling from 0-255.
666// We must divide each CMYK component by 255 to obtain the true conversion
667// we should perform.
668// CMYK -> RGB
669// R = C * K / 255
670// G = M * K / 255
671// B = Y * K / 255
672static void swizzle_cmyk_to_rgba(
673 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
674 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
675
676 src += offset;
677 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
678 for (int x = 0; x < dstWidth; x++) {
679 const uint8_t r = SkMulDiv255Round(src[0], src[3]);
680 const uint8_t g = SkMulDiv255Round(src[1], src[3]);
681 const uint8_t b = SkMulDiv255Round(src[2], src[3]);
682
683 dst[x] = SkPackARGB_as_RGBA(0xFF, r, g, b);
684 src += deltaSrc;
685 }
686}
687
688static void swizzle_cmyk_to_bgra(
689 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
690 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
691
692 src += offset;
693 SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
694 for (int x = 0; x < dstWidth; x++) {
695 const uint8_t r = SkMulDiv255Round(src[0], src[3]);
696 const uint8_t g = SkMulDiv255Round(src[1], src[3]);
697 const uint8_t b = SkMulDiv255Round(src[2], src[3]);
698
699 dst[x] = SkPackARGB_as_BGRA(0xFF, r, g, b);
700 src += deltaSrc;
701 }
702}
703
704static void fast_swizzle_cmyk_to_rgba(
705 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
706 const SkPMColor ctable[]) {
707
708 // This function must not be called if we are sampling. If we are not
709 // sampling, deltaSrc should equal bpp.
710 SkASSERT(deltaSrc == bpp);
711
712 SkOpts::inverted_CMYK_to_RGB1((uint32_t*) dst, (const uint32_t*)(src + offset), width);
713}
714
715static void fast_swizzle_cmyk_to_bgra(
716 void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
717 const SkPMColor ctable[]) {
718
719 // This function must not be called if we are sampling. If we are not
720 // sampling, deltaSrc should equal bpp.
721 SkASSERT(deltaSrc == bpp);
722
723 SkOpts::inverted_CMYK_to_BGR1((uint32_t*) dst, (const uint32_t*)(src + offset), width);
724}
725
726static void swizzle_cmyk_to_565(
727 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
728 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
729
730 src += offset;
731 uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
732 for (int x = 0; x < dstWidth; x++) {
733 const uint8_t r = SkMulDiv255Round(src[0], src[3]);
734 const uint8_t g = SkMulDiv255Round(src[1], src[3]);
735 const uint8_t b = SkMulDiv255Round(src[2], src[3]);
736
737 dst[x] = SkPack888ToRGB16(r, g, b);
738 src += deltaSrc;
739 }
740}
741
742template <SkSwizzler::RowProc proc>
743void SkSwizzler::SkipLeadingGrayAlphaZerosThen(
744 void* dst, const uint8_t* src, int width,
745 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
746 SkASSERT(!ctable);
747
748 const uint16_t* src16 = (const uint16_t*) (src + offset);
749 uint32_t* dst32 = (uint32_t*) dst;
750
751 // This may miss opportunities to skip when the output is premultiplied,
752 // e.g. for a src pixel 0x00FF which is not zero but becomes zero after premultiplication.
753 while (width > 0 && *src16 == 0x0000) {
754 width--;
755 dst32++;
756 src16 += deltaSrc / 2;
757 }
758 proc(dst32, (const uint8_t*)src16, width, bpp, deltaSrc, 0, ctable);
759}
760
761template <SkSwizzler::RowProc proc>
762void SkSwizzler::SkipLeading8888ZerosThen(
763 void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
764 int bpp, int deltaSrc, int offset, const SkPMColor ctable[]) {
765 SkASSERT(!ctable);
766
767 auto src32 = (const uint32_t*)(src+offset);
768 auto dst32 = (uint32_t*)dstRow;
769
770 // This may miss opportunities to skip when the output is premultiplied,
771 // e.g. for a src pixel 0x00FFFFFF which is not zero but becomes zero after premultiplication.
772 while (dstWidth > 0 && *src32 == 0x00000000) {
773 dstWidth--;
774 dst32++;
775 src32 += deltaSrc/4;
776 }
777 proc(dst32, (const uint8_t*)src32, dstWidth, bpp, deltaSrc, 0, ctable);
778}
779
780std::unique_ptr<SkSwizzler> SkSwizzler::MakeSimple(int srcBPP, const SkImageInfo& dstInfo,
781 const SkCodec::Options& options) {
782 RowProc proc = nullptr;
783 switch (srcBPP) {
784 case 1: // kGray_8_SkColorType
785 proc = &sample1;
786 break;
787 case 2: // kRGB_565_SkColorType
788 proc = &sample2;
789 break;
790 case 4: // kRGBA_8888_SkColorType
791 // kBGRA_8888_SkColorType
792 proc = &sample4;
793 break;
794 case 6: // 16 bit PNG no alpha
795 proc = &sample6;
796 break;
797 case 8: // 16 bit PNG with alpha
798 proc = &sample8;
799 break;
800 default:
801 return nullptr;
802 }
803
804 return Make(dstInfo, &copy, proc, nullptr /*ctable*/, srcBPP,
805 dstInfo.bytesPerPixel(), options, nullptr /*frame*/);
806}
807
808std::unique_ptr<SkSwizzler> SkSwizzler::Make(const SkEncodedInfo& encodedInfo,
809 const SkPMColor* ctable,
810 const SkImageInfo& dstInfo,
811 const SkCodec::Options& options,
812 const SkIRect* frame) {
813 if (SkEncodedInfo::kPalette_Color == encodedInfo.color() && nullptr == ctable) {
814 return nullptr;
815 }
816
817 RowProc fastProc = nullptr;
818 RowProc proc = nullptr;
819 SkCodec::ZeroInitialized zeroInit = options.fZeroInitialized;
820 const bool premultiply = (SkEncodedInfo::kOpaque_Alpha != encodedInfo.alpha()) &&
821 (kPremul_SkAlphaType == dstInfo.alphaType());
822
823 switch (encodedInfo.color()) {
824 case SkEncodedInfo::kGray_Color:
825 switch (encodedInfo.bitsPerComponent()) {
826 case 1:
827 switch (dstInfo.colorType()) {
828 case kRGBA_8888_SkColorType:
829 case kBGRA_8888_SkColorType:
830 proc = &swizzle_bit_to_n32;
831 break;
832 case kRGB_565_SkColorType:
833 proc = &swizzle_bit_to_565;
834 break;
835 case kGray_8_SkColorType:
836 proc = &swizzle_bit_to_grayscale;
837 break;
838 case kRGBA_F16_SkColorType:
839 proc = &swizzle_bit_to_f16;
840 break;
841 default:
842 return nullptr;
843 }
844 break;
845 case 8:
846 switch (dstInfo.colorType()) {
847 case kRGBA_8888_SkColorType:
848 case kBGRA_8888_SkColorType:
849 proc = &swizzle_gray_to_n32;
850 fastProc = &fast_swizzle_gray_to_n32;
851 break;
852 case kGray_8_SkColorType:
853 proc = &sample1;
854 fastProc = &copy;
855 break;
856 case kRGB_565_SkColorType:
857 proc = &swizzle_gray_to_565;
858 break;
859 default:
860 return nullptr;
861 }
862 break;
863 default:
864 return nullptr;
865 }
866 break;
867 case SkEncodedInfo::kXAlpha_Color:
868 case SkEncodedInfo::kGrayAlpha_Color:
869 switch (dstInfo.colorType()) {
870 case kRGBA_8888_SkColorType:
871 case kBGRA_8888_SkColorType:
872 if (premultiply) {
873 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
874 proc = &SkipLeadingGrayAlphaZerosThen
875 <swizzle_grayalpha_to_n32_premul>;
876 fastProc = &SkipLeadingGrayAlphaZerosThen
877 <fast_swizzle_grayalpha_to_n32_premul>;
878 } else {
879 proc = &swizzle_grayalpha_to_n32_premul;
880 fastProc = &fast_swizzle_grayalpha_to_n32_premul;
881 }
882 } else {
883 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
884 proc = &SkipLeadingGrayAlphaZerosThen
885 <swizzle_grayalpha_to_n32_unpremul>;
886 fastProc = &SkipLeadingGrayAlphaZerosThen
887 <fast_swizzle_grayalpha_to_n32_unpremul>;
888 } else {
889 proc = &swizzle_grayalpha_to_n32_unpremul;
890 fastProc = &fast_swizzle_grayalpha_to_n32_unpremul;
891 }
892 }
893 break;
894 case kAlpha_8_SkColorType:
895 proc = &swizzle_grayalpha_to_a8;
896 break;
897 default:
898 return nullptr;
899 }
900 break;
901 case SkEncodedInfo::kPalette_Color:
902 // We assume that the color table is premultiplied and swizzled
903 // as desired.
904 switch (encodedInfo.bitsPerComponent()) {
905 case 1:
906 case 2:
907 case 4:
908 switch (dstInfo.colorType()) {
909 case kRGBA_8888_SkColorType:
910 case kBGRA_8888_SkColorType:
911 proc = &swizzle_small_index_to_n32;
912 break;
913 case kRGB_565_SkColorType:
914 proc = &swizzle_small_index_to_565;
915 break;
916 default:
917 return nullptr;
918 }
919 break;
920 case 8:
921 switch (dstInfo.colorType()) {
922 case kRGBA_8888_SkColorType:
923 case kBGRA_8888_SkColorType:
924 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
925 proc = &swizzle_index_to_n32_skipZ;
926 } else {
927 proc = &swizzle_index_to_n32;
928 }
929 break;
930 case kRGB_565_SkColorType:
931 proc = &swizzle_index_to_565;
932 break;
933 default:
934 return nullptr;
935 }
936 break;
937 default:
938 return nullptr;
939 }
940 break;
941 case SkEncodedInfo::k565_Color:
942 // Treat 565 exactly like RGB (since it's still encoded as 8 bits per component).
943 // We just mark as 565 when we have a hint that there are only 5/6/5 "significant"
944 // bits in each channel.
945 case SkEncodedInfo::kRGB_Color:
946 switch (dstInfo.colorType()) {
947 case kRGBA_8888_SkColorType:
948 if (16 == encodedInfo.bitsPerComponent()) {
949 proc = &swizzle_rgb16_to_rgba;
950 break;
951 }
952
953 SkASSERT(8 == encodedInfo.bitsPerComponent());
954 proc = &swizzle_rgb_to_rgba;
955 fastProc = &fast_swizzle_rgb_to_rgba;
956 break;
957 case kBGRA_8888_SkColorType:
958 if (16 == encodedInfo.bitsPerComponent()) {
959 proc = &swizzle_rgb16_to_bgra;
960 break;
961 }
962
963 SkASSERT(8 == encodedInfo.bitsPerComponent());
964 proc = &swizzle_rgb_to_bgra;
965 fastProc = &fast_swizzle_rgb_to_bgra;
966 break;
967 case kRGB_565_SkColorType:
968 if (16 == encodedInfo.bitsPerComponent()) {
969 proc = &swizzle_rgb16_to_565;
970 break;
971 }
972
973 proc = &swizzle_rgb_to_565;
974 break;
975 default:
976 return nullptr;
977 }
978 break;
979 case SkEncodedInfo::kRGBA_Color:
980 switch (dstInfo.colorType()) {
981 case kRGBA_8888_SkColorType:
982 if (16 == encodedInfo.bitsPerComponent()) {
983 proc = premultiply ? &swizzle_rgba16_to_rgba_premul :
984 &swizzle_rgba16_to_rgba_unpremul;
985 break;
986 }
987
988 SkASSERT(8 == encodedInfo.bitsPerComponent());
989 if (premultiply) {
990 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
991 proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_rgba_premul>;
992 fastProc = &SkipLeading8888ZerosThen
993 <fast_swizzle_rgba_to_rgba_premul>;
994 } else {
995 proc = &swizzle_rgba_to_rgba_premul;
996 fastProc = &fast_swizzle_rgba_to_rgba_premul;
997 }
998 } else {
999 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1000 proc = &SkipLeading8888ZerosThen<sample4>;
1001 fastProc = &SkipLeading8888ZerosThen<copy>;
1002 } else {
1003 proc = &sample4;
1004 fastProc = &copy;
1005 }
1006 }
1007 break;
1008 case kBGRA_8888_SkColorType:
1009 if (16 == encodedInfo.bitsPerComponent()) {
1010 proc = premultiply ? &swizzle_rgba16_to_bgra_premul :
1011 &swizzle_rgba16_to_bgra_unpremul;
1012 break;
1013 }
1014
1015 SkASSERT(8 == encodedInfo.bitsPerComponent());
1016 if (premultiply) {
1017 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1018 proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_bgra_premul>;
1019 fastProc = &SkipLeading8888ZerosThen
1020 <fast_swizzle_rgba_to_bgra_premul>;
1021 } else {
1022 proc = &swizzle_rgba_to_bgra_premul;
1023 fastProc = &fast_swizzle_rgba_to_bgra_premul;
1024 }
1025 } else {
1026 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1027 proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_bgra_unpremul>;
1028 fastProc = &SkipLeading8888ZerosThen
1029 <fast_swizzle_rgba_to_bgra_unpremul>;
1030 } else {
1031 proc = &swizzle_rgba_to_bgra_unpremul;
1032 fastProc = &fast_swizzle_rgba_to_bgra_unpremul;
1033 }
1034 }
1035 break;
1036 default:
1037 return nullptr;
1038 }
1039 break;
1040 case SkEncodedInfo::kBGR_Color:
1041 switch (dstInfo.colorType()) {
1042 case kBGRA_8888_SkColorType:
1043 proc = &swizzle_rgb_to_rgba;
1044 fastProc = &fast_swizzle_rgb_to_rgba;
1045 break;
1046 case kRGBA_8888_SkColorType:
1047 proc = &swizzle_rgb_to_bgra;
1048 fastProc = &fast_swizzle_rgb_to_bgra;
1049 break;
1050 case kRGB_565_SkColorType:
1051 proc = &swizzle_bgr_to_565;
1052 break;
1053 default:
1054 return nullptr;
1055 }
1056 break;
1057 case SkEncodedInfo::kBGRX_Color:
1058 switch (dstInfo.colorType()) {
1059 case kBGRA_8888_SkColorType:
1060 proc = &swizzle_rgb_to_rgba;
1061 break;
1062 case kRGBA_8888_SkColorType:
1063 proc = &swizzle_rgb_to_bgra;
1064 break;
1065 case kRGB_565_SkColorType:
1066 proc = &swizzle_bgr_to_565;
1067 break;
1068 default:
1069 return nullptr;
1070 }
1071 break;
1072 case SkEncodedInfo::kBGRA_Color:
1073 switch (dstInfo.colorType()) {
1074 case kBGRA_8888_SkColorType:
1075 if (premultiply) {
1076 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1077 proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_rgba_premul>;
1078 fastProc = &SkipLeading8888ZerosThen
1079 <fast_swizzle_rgba_to_rgba_premul>;
1080 } else {
1081 proc = &swizzle_rgba_to_rgba_premul;
1082 fastProc = &fast_swizzle_rgba_to_rgba_premul;
1083 }
1084 } else {
1085 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1086 proc = &SkipLeading8888ZerosThen<sample4>;
1087 fastProc = &SkipLeading8888ZerosThen<copy>;
1088 } else {
1089 proc = &sample4;
1090 fastProc = &copy;
1091 }
1092 }
1093 break;
1094 case kRGBA_8888_SkColorType:
1095 if (premultiply) {
1096 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1097 proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_bgra_premul>;
1098 fastProc = &SkipLeading8888ZerosThen
1099 <fast_swizzle_rgba_to_bgra_premul>;
1100 } else {
1101 proc = &swizzle_rgba_to_bgra_premul;
1102 fastProc = &fast_swizzle_rgba_to_bgra_premul;
1103 }
1104 } else {
1105 if (SkCodec::kYes_ZeroInitialized == zeroInit) {
1106 proc = &SkipLeading8888ZerosThen<swizzle_rgba_to_bgra_unpremul>;
1107 fastProc = &SkipLeading8888ZerosThen
1108 <fast_swizzle_rgba_to_bgra_unpremul>;
1109 } else {
1110 proc = &swizzle_rgba_to_bgra_unpremul;
1111 fastProc = &fast_swizzle_rgba_to_bgra_unpremul;
1112 }
1113 }
1114 break;
1115 default:
1116 return nullptr;
1117 }
1118 break;
1119 case SkEncodedInfo::kInvertedCMYK_Color:
1120 switch (dstInfo.colorType()) {
1121 case kRGBA_8888_SkColorType:
1122 proc = &swizzle_cmyk_to_rgba;
1123 fastProc = &fast_swizzle_cmyk_to_rgba;
1124 break;
1125 case kBGRA_8888_SkColorType:
1126 proc = &swizzle_cmyk_to_bgra;
1127 fastProc = &fast_swizzle_cmyk_to_bgra;
1128 break;
1129 case kRGB_565_SkColorType:
1130 proc = &swizzle_cmyk_to_565;
1131 break;
1132 default:
1133 return nullptr;
1134 }
1135 break;
1136 default:
1137 return nullptr;
1138 }
1139
1140 // Store bpp in bytes if it is an even multiple, otherwise use bits
1141 uint8_t bitsPerPixel = encodedInfo.bitsPerPixel();
1142 int srcBPP = SkIsAlign8(bitsPerPixel) ? bitsPerPixel / 8 : bitsPerPixel;
1143 int dstBPP = dstInfo.bytesPerPixel();
1144 return Make(dstInfo, fastProc, proc, ctable, srcBPP, dstBPP, options, frame);
1145}
1146
1147std::unique_ptr<SkSwizzler> SkSwizzler::Make(const SkImageInfo& dstInfo,
1148 RowProc fastProc, RowProc proc, const SkPMColor* ctable, int srcBPP,
1149 int dstBPP, const SkCodec::Options& options, const SkIRect* frame) {
1150 int srcOffset = 0;
1151 int srcWidth = dstInfo.width();
1152 int dstOffset = 0;
1153 int dstWidth = srcWidth;
1154 if (options.fSubset) {
1155 // We do not currently support subset decodes for image types that may have
1156 // frames (gif).
1157 SkASSERT(!frame);
1158 srcOffset = options.fSubset->left();
1159 srcWidth = options.fSubset->width();
1160 dstWidth = srcWidth;
1161 } else if (frame) {
1162 dstOffset = frame->left();
1163 srcWidth = frame->width();
1164 }
1165
1166 return std::unique_ptr<SkSwizzler>(new SkSwizzler(fastProc, proc, ctable, srcOffset, srcWidth,
1167 dstOffset, dstWidth, srcBPP, dstBPP));
1168}
1169
1170SkSwizzler::SkSwizzler(RowProc fastProc, RowProc proc, const SkPMColor* ctable, int srcOffset,
1171 int srcWidth, int dstOffset, int dstWidth, int srcBPP, int dstBPP)
1172 : fFastProc(fastProc)
1173 , fSlowProc(proc)
1174 , fActualProc(fFastProc ? fFastProc : fSlowProc)
1175 , fColorTable(ctable)
1176 , fSrcOffset(srcOffset)
1177 , fDstOffset(dstOffset)
1178 , fSrcOffsetUnits(srcOffset * srcBPP)
1179 , fDstOffsetBytes(dstOffset * dstBPP)
1180 , fSrcWidth(srcWidth)
1181 , fDstWidth(dstWidth)
1182 , fSwizzleWidth(srcWidth)
1183 , fAllocatedWidth(dstWidth)
1184 , fSampleX(1)
1185 , fSrcBPP(srcBPP)
1186 , fDstBPP(dstBPP)
1187{}
1188
1189int SkSwizzler::onSetSampleX(int sampleX) {
1190 SkASSERT(sampleX > 0);
1191
1192 fSampleX = sampleX;
1193 fDstOffsetBytes = (fDstOffset / sampleX) * fDstBPP;
1194 fSwizzleWidth = get_scaled_dimension(fSrcWidth, sampleX);
1195 fAllocatedWidth = get_scaled_dimension(fDstWidth, sampleX);
1196
1197 int frameSampleX = sampleX;
1198 if (fSrcWidth < fDstWidth) {
1199 // Although SkSampledCodec adjusted sampleX so that it will never be
1200 // larger than the width of the image (or subset, if applicable), it
1201 // doesn't account for the width of a subset frame (i.e. gif). As a
1202 // result, get_start_coord(sampleX) could result in fSrcOffsetUnits
1203 // being wider than fSrcWidth. Compute a sampling rate based on the
1204 // frame width to ensure that fSrcOffsetUnits is sensible.
1205 frameSampleX = fSrcWidth / fSwizzleWidth;
1206 }
1207 fSrcOffsetUnits = (get_start_coord(frameSampleX) + fSrcOffset) * fSrcBPP;
1208
1209 if (fDstOffsetBytes > 0) {
1210 const size_t dstSwizzleBytes = fSwizzleWidth * fDstBPP;
1211 const size_t dstAllocatedBytes = fAllocatedWidth * fDstBPP;
1212 if (fDstOffsetBytes + dstSwizzleBytes > dstAllocatedBytes) {
1213#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
1214 SkAndroidFrameworkUtils::SafetyNetLog("118143775");
1215#endif
1216 SkASSERT(dstSwizzleBytes <= dstAllocatedBytes);
1217 fDstOffsetBytes = dstAllocatedBytes - dstSwizzleBytes;
1218 }
1219 }
1220
1221 // The optimized swizzler functions do not support sampling. Sampled swizzles
1222 // are already fast because they skip pixels. We haven't seen a situation
1223 // where speeding up sampling has a significant impact on total decode time.
1224 if (1 == fSampleX && fFastProc) {
1225 fActualProc = fFastProc;
1226 } else {
1227 fActualProc = fSlowProc;
1228 }
1229
1230 return fAllocatedWidth;
1231}
1232
1233void SkSwizzler::swizzle(void* dst, const uint8_t* SK_RESTRICT src) {
1234 SkASSERT(nullptr != dst && nullptr != src);
1235 fActualProc(SkTAddOffset<void>(dst, fDstOffsetBytes), src, fSwizzleWidth, fSrcBPP,
1236 fSampleX * fSrcBPP, fSrcOffsetUnits, fColorTable);
1237}
1238