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 "SkWebpCodec.h"
9
10 #include "SkBitmap.h"
11 #include "SkCanvas.h"
12 #include "SkCodecAnimation.h"
13 #include "SkCodecAnimationPriv.h"
14 #include "SkCodecPriv.h"
15 #include "SkMakeUnique.h"
16 #include "SkRasterPipeline.h"
17 #include "SkSampler.h"
18 #include "SkStreamPriv.h"
19 #include "SkTemplates.h"
20 #include "SkTo.h"
21
22 // A WebP decoder on top of (subset of) libwebp
23 // For more information on WebP image format, and libwebp library, see:
24 // https://code.google.com/speed/webp/
25 // http://www.webmproject.org/code/#libwebp-webp-image-library
26 // https://chromium.googlesource.com/webm/libwebp
27
28 // If moving libwebp out of skia source tree, path for webp headers must be
29 // updated accordingly. Here, we enforce using local copy in webp sub-directory.
30 #include "webp/decode.h"
31 #include "webp/demux.h"
32 #include "webp/encode.h"
33
IsWebp(const void * buf,size_t bytesRead)34 bool SkWebpCodec::IsWebp(const void* buf, size_t bytesRead) {
35 // WEBP starts with the following:
36 // RIFFXXXXWEBPVP
37 // Where XXXX is unspecified.
38 const char* bytes = static_cast<const char*>(buf);
39 return bytesRead >= 14 && !memcmp(bytes, "RIFF", 4) && !memcmp(&bytes[8], "WEBPVP", 6);
40 }
41
42 // Parse headers of RIFF container, and check for valid Webp (VP8) content.
43 // Returns an SkWebpCodec on success
MakeFromStream(std::unique_ptr<SkStream> stream,Result * result)44 std::unique_ptr<SkCodec> SkWebpCodec::MakeFromStream(std::unique_ptr<SkStream> stream,
45 Result* result) {
46 // Webp demux needs a contiguous data buffer.
47 sk_sp<SkData> data = nullptr;
48 if (stream->getMemoryBase()) {
49 // It is safe to make without copy because we'll hold onto the stream.
50 data = SkData::MakeWithoutCopy(stream->getMemoryBase(), stream->getLength());
51 } else {
52 data = SkCopyStreamToData(stream.get());
53
54 // If we are forced to copy the stream to a data, we can go ahead and delete the stream.
55 stream.reset(nullptr);
56 }
57
58 // It's a little strange that the |demux| will outlive |webpData|, though it needs the
59 // pointer in |webpData| to remain valid. This works because the pointer remains valid
60 // until the SkData is freed.
61 WebPData webpData = { data->bytes(), data->size() };
62 WebPDemuxState state;
63 SkAutoTCallVProc<WebPDemuxer, WebPDemuxDelete> demux(WebPDemuxPartial(&webpData, &state));
64 switch (state) {
65 case WEBP_DEMUX_PARSE_ERROR:
66 *result = kInvalidInput;
67 return nullptr;
68 case WEBP_DEMUX_PARSING_HEADER:
69 *result = kIncompleteInput;
70 return nullptr;
71 case WEBP_DEMUX_PARSED_HEADER:
72 case WEBP_DEMUX_DONE:
73 SkASSERT(demux);
74 break;
75 }
76
77 const int width = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
78 const int height = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
79
80 // Sanity check for image size that's about to be decoded.
81 {
82 const int64_t size = sk_64_mul(width, height);
83 // now check that if we are 4-bytes per pixel, we also don't overflow
84 if (!SkTFitsIn<int32_t>(size) || SkTo<int32_t>(size) > (0x7FFFFFFF >> 2)) {
85 *result = kInvalidInput;
86 return nullptr;
87 }
88 }
89
90 std::unique_ptr<SkEncodedInfo::ICCProfile> profile = nullptr;
91 {
92 WebPChunkIterator chunkIterator;
93 SkAutoTCallVProc<WebPChunkIterator, WebPDemuxReleaseChunkIterator> autoCI(&chunkIterator);
94 if (WebPDemuxGetChunk(demux, "ICCP", 1, &chunkIterator)) {
95 // FIXME: I think this could be MakeWithoutCopy
96 auto chunk = SkData::MakeWithCopy(chunkIterator.chunk.bytes, chunkIterator.chunk.size);
97 profile = SkEncodedInfo::ICCProfile::Make(std::move(chunk));
98 }
99 if (profile && profile->profile()->data_color_space != skcms_Signature_RGB) {
100 profile = nullptr;
101 }
102 }
103
104 SkEncodedOrigin origin = kDefault_SkEncodedOrigin;
105 {
106 WebPChunkIterator chunkIterator;
107 SkAutoTCallVProc<WebPChunkIterator, WebPDemuxReleaseChunkIterator> autoCI(&chunkIterator);
108 if (WebPDemuxGetChunk(demux, "EXIF", 1, &chunkIterator)) {
109 is_orientation_marker(chunkIterator.chunk.bytes, chunkIterator.chunk.size, &origin);
110 }
111 }
112
113 // Get the first frame and its "features" to determine the color and alpha types.
114 WebPIterator frame;
115 SkAutoTCallVProc<WebPIterator, WebPDemuxReleaseIterator> autoFrame(&frame);
116 if (!WebPDemuxGetFrame(demux, 1, &frame)) {
117 *result = kIncompleteInput;
118 return nullptr;
119 }
120
121 WebPBitstreamFeatures features;
122 switch (WebPGetFeatures(frame.fragment.bytes, frame.fragment.size, &features)) {
123 case VP8_STATUS_OK:
124 break;
125 case VP8_STATUS_SUSPENDED:
126 case VP8_STATUS_NOT_ENOUGH_DATA:
127 *result = kIncompleteInput;
128 return nullptr;
129 default:
130 *result = kInvalidInput;
131 return nullptr;
132 }
133
134 const bool hasAlpha = SkToBool(frame.has_alpha)
135 || frame.width != width || frame.height != height;
136 SkEncodedInfo::Color color;
137 SkEncodedInfo::Alpha alpha;
138 switch (features.format) {
139 case 0:
140 // This indicates a "mixed" format. We could see this for
141 // animated webps (multiple fragments).
142 // We could also guess kYUV here, but I think it makes more
143 // sense to guess kBGRA which is likely closer to the final
144 // output. Otherwise, we might end up converting
145 // BGRA->YUVA->BGRA.
146 // Fallthrough:
147 case 2:
148 // This is the lossless format (BGRA).
149 if (hasAlpha) {
150 color = SkEncodedInfo::kBGRA_Color;
151 alpha = SkEncodedInfo::kUnpremul_Alpha;
152 } else {
153 color = SkEncodedInfo::kBGRX_Color;
154 alpha = SkEncodedInfo::kOpaque_Alpha;
155 }
156 break;
157 case 1:
158 // This is the lossy format (YUV).
159 if (hasAlpha) {
160 color = SkEncodedInfo::kYUVA_Color;
161 alpha = SkEncodedInfo::kUnpremul_Alpha;
162 } else {
163 color = SkEncodedInfo::kYUV_Color;
164 alpha = SkEncodedInfo::kOpaque_Alpha;
165 }
166 break;
167 default:
168 *result = kInvalidInput;
169 return nullptr;
170 }
171
172
173 *result = kSuccess;
174 SkEncodedInfo info = SkEncodedInfo::Make(width, height, color, alpha, 8, std::move(profile));
175 return std::unique_ptr<SkCodec>(new SkWebpCodec(std::move(info), std::move(stream),
176 demux.release(), std::move(data), origin));
177 }
178
onGetScaledDimensions(float desiredScale) const179 SkISize SkWebpCodec::onGetScaledDimensions(float desiredScale) const {
180 SkISize dim = this->dimensions();
181 // SkCodec treats zero dimensional images as errors, so the minimum size
182 // that we will recommend is 1x1.
183 dim.fWidth = SkTMax(1, SkScalarRoundToInt(desiredScale * dim.fWidth));
184 dim.fHeight = SkTMax(1, SkScalarRoundToInt(desiredScale * dim.fHeight));
185 return dim;
186 }
187
onDimensionsSupported(const SkISize & dim)188 bool SkWebpCodec::onDimensionsSupported(const SkISize& dim) {
189 const SkEncodedInfo& info = this->getEncodedInfo();
190 return dim.width() >= 1 && dim.width() <= info.width()
191 && dim.height() >= 1 && dim.height() <= info.height();
192 }
193
webp_decode_mode(SkColorType dstCT,bool premultiply)194 static WEBP_CSP_MODE webp_decode_mode(SkColorType dstCT, bool premultiply) {
195 switch (dstCT) {
196 case kBGRA_8888_SkColorType:
197 return premultiply ? MODE_bgrA : MODE_BGRA;
198 case kRGBA_8888_SkColorType:
199 return premultiply ? MODE_rgbA : MODE_RGBA;
200 case kRGB_565_SkColorType:
201 return MODE_RGB_565;
202 default:
203 return MODE_LAST;
204 }
205 }
206
appendNewFrame(bool hasAlpha)207 SkWebpCodec::Frame* SkWebpCodec::FrameHolder::appendNewFrame(bool hasAlpha) {
208 const int i = this->size();
209 fFrames.emplace_back(i, hasAlpha ? SkEncodedInfo::kUnpremul_Alpha
210 : SkEncodedInfo::kOpaque_Alpha);
211 return &fFrames[i];
212 }
213
onGetValidSubset(SkIRect * desiredSubset) const214 bool SkWebpCodec::onGetValidSubset(SkIRect* desiredSubset) const {
215 if (!desiredSubset) {
216 return false;
217 }
218
219 if (!this->bounds().contains(*desiredSubset)) {
220 return false;
221 }
222
223 // As stated below, libwebp snaps to even left and top. Make sure top and left are even, so we
224 // decode this exact subset.
225 // Leave right and bottom unmodified, so we suggest a slightly larger subset than requested.
226 desiredSubset->fLeft = (desiredSubset->fLeft >> 1) << 1;
227 desiredSubset->fTop = (desiredSubset->fTop >> 1) << 1;
228 return true;
229 }
230
onGetRepetitionCount()231 int SkWebpCodec::onGetRepetitionCount() {
232 auto flags = WebPDemuxGetI(fDemux.get(), WEBP_FF_FORMAT_FLAGS);
233 if (!(flags & ANIMATION_FLAG)) {
234 return 0;
235 }
236
237 const int repCount = WebPDemuxGetI(fDemux.get(), WEBP_FF_LOOP_COUNT);
238 if (0 == repCount) {
239 return kRepetitionCountInfinite;
240 }
241
242 return repCount;
243 }
244
onGetFrameCount()245 int SkWebpCodec::onGetFrameCount() {
246 auto flags = WebPDemuxGetI(fDemux.get(), WEBP_FF_FORMAT_FLAGS);
247 if (!(flags & ANIMATION_FLAG)) {
248 return 1;
249 }
250
251 const uint32_t oldFrameCount = fFrameHolder.size();
252 if (fFailed) {
253 return oldFrameCount;
254 }
255
256 const uint32_t frameCount = WebPDemuxGetI(fDemux, WEBP_FF_FRAME_COUNT);
257 if (oldFrameCount == frameCount) {
258 // We have already parsed this.
259 return frameCount;
260 }
261
262 fFrameHolder.reserve(frameCount);
263
264 for (uint32_t i = oldFrameCount; i < frameCount; i++) {
265 WebPIterator iter;
266 SkAutoTCallVProc<WebPIterator, WebPDemuxReleaseIterator> autoIter(&iter);
267
268 if (!WebPDemuxGetFrame(fDemux.get(), i + 1, &iter)) {
269 fFailed = true;
270 break;
271 }
272
273 // libwebp only reports complete frames of an animated image.
274 SkASSERT(iter.complete);
275
276 Frame* frame = fFrameHolder.appendNewFrame(iter.has_alpha);
277 frame->setXYWH(iter.x_offset, iter.y_offset, iter.width, iter.height);
278 frame->setDisposalMethod(iter.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ?
279 SkCodecAnimation::DisposalMethod::kRestoreBGColor :
280 SkCodecAnimation::DisposalMethod::kKeep);
281 frame->setDuration(iter.duration);
282 if (WEBP_MUX_BLEND != iter.blend_method) {
283 frame->setBlend(SkCodecAnimation::Blend::kBG);
284 }
285 fFrameHolder.setAlphaAndRequiredFrame(frame);
286 }
287
288 return fFrameHolder.size();
289
290 }
291
onGetFrame(int i) const292 const SkFrame* SkWebpCodec::FrameHolder::onGetFrame(int i) const {
293 return static_cast<const SkFrame*>(this->frame(i));
294 }
295
frame(int i) const296 const SkWebpCodec::Frame* SkWebpCodec::FrameHolder::frame(int i) const {
297 SkASSERT(i >= 0 && i < this->size());
298 return &fFrames[i];
299 }
300
onGetFrameInfo(int i,FrameInfo * frameInfo) const301 bool SkWebpCodec::onGetFrameInfo(int i, FrameInfo* frameInfo) const {
302 if (i >= fFrameHolder.size()) {
303 return false;
304 }
305
306 const Frame* frame = fFrameHolder.frame(i);
307 if (!frame) {
308 return false;
309 }
310
311 if (frameInfo) {
312 frameInfo->fRequiredFrame = frame->getRequiredFrame();
313 frameInfo->fDuration = frame->getDuration();
314 // libwebp only reports fully received frames for an
315 // animated image.
316 frameInfo->fFullyReceived = true;
317 frameInfo->fAlphaType = frame->hasAlpha() ? kUnpremul_SkAlphaType
318 : kOpaque_SkAlphaType;
319 frameInfo->fDisposalMethod = frame->getDisposalMethod();
320 }
321
322 return true;
323 }
324
is_8888(SkColorType colorType)325 static bool is_8888(SkColorType colorType) {
326 switch (colorType) {
327 case kRGBA_8888_SkColorType:
328 case kBGRA_8888_SkColorType:
329 return true;
330 default:
331 return false;
332 }
333 }
334
335 // Requires that the src input be unpremultiplied (or opaque).
blend_line(SkColorType dstCT,void * dst,SkColorType srcCT,const void * src,SkAlphaType dstAt,bool srcHasAlpha,int width)336 static void blend_line(SkColorType dstCT, void* dst,
337 SkColorType srcCT, const void* src,
338 SkAlphaType dstAt,
339 bool srcHasAlpha,
340 int width) {
341 SkRasterPipeline_MemoryCtx dst_ctx = { (void*)dst, 0 },
342 src_ctx = { (void*)src, 0 };
343
344 SkRasterPipeline_<256> p;
345
346 p.append_load_dst(dstCT, &dst_ctx);
347 if (kUnpremul_SkAlphaType == dstAt) {
348 p.append(SkRasterPipeline::premul_dst);
349 }
350
351 p.append_load(srcCT, &src_ctx);
352 if (srcHasAlpha) {
353 p.append(SkRasterPipeline::premul);
354 }
355
356 p.append(SkRasterPipeline::srcover);
357
358 if (kUnpremul_SkAlphaType == dstAt) {
359 p.append(SkRasterPipeline::unpremul);
360 }
361 p.append_store(dstCT, &dst_ctx);
362
363 p.run(0,0, width,1);
364 }
365
onGetPixels(const SkImageInfo & dstInfo,void * dst,size_t rowBytes,const Options & options,int * rowsDecodedPtr)366 SkCodec::Result SkWebpCodec::onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t rowBytes,
367 const Options& options, int* rowsDecodedPtr) {
368 const int index = options.fFrameIndex;
369 SkASSERT(0 == index || index < fFrameHolder.size());
370 SkASSERT(0 == index || !options.fSubset);
371
372 WebPDecoderConfig config;
373 if (0 == WebPInitDecoderConfig(&config)) {
374 // ABI mismatch.
375 // FIXME: New enum for this?
376 return kInvalidInput;
377 }
378
379 // Free any memory associated with the buffer. Must be called last, so we declare it first.
380 SkAutoTCallVProc<WebPDecBuffer, WebPFreeDecBuffer> autoFree(&(config.output));
381
382 WebPIterator frame;
383 SkAutoTCallVProc<WebPIterator, WebPDemuxReleaseIterator> autoFrame(&frame);
384 // If this succeeded in onGetFrameCount(), it should succeed again here.
385 SkAssertResult(WebPDemuxGetFrame(fDemux, index + 1, &frame));
386
387 const bool independent = index == 0 ? true :
388 (fFrameHolder.frame(index)->getRequiredFrame() == kNoFrame);
389 // Get the frameRect. libwebp will have already signaled an error if this is not fully
390 // contained by the canvas.
391 auto frameRect = SkIRect::MakeXYWH(frame.x_offset, frame.y_offset, frame.width, frame.height);
392 SkASSERT(this->bounds().contains(frameRect));
393 const bool frameIsSubset = frameRect != this->bounds();
394 if (independent && frameIsSubset) {
395 SkSampler::Fill(dstInfo, dst, rowBytes, options.fZeroInitialized);
396 }
397
398 int dstX = frameRect.x();
399 int dstY = frameRect.y();
400 int subsetWidth = frameRect.width();
401 int subsetHeight = frameRect.height();
402 if (options.fSubset) {
403 SkIRect subset = *options.fSubset;
404 SkASSERT(this->bounds().contains(subset));
405 SkASSERT(SkIsAlign2(subset.fLeft) && SkIsAlign2(subset.fTop));
406 SkASSERT(this->getValidSubset(&subset) && subset == *options.fSubset);
407
408 if (!SkIRect::IntersectsNoEmptyCheck(subset, frameRect)) {
409 return kSuccess;
410 }
411
412 int minXOffset = SkTMin(dstX, subset.x());
413 int minYOffset = SkTMin(dstY, subset.y());
414 dstX -= minXOffset;
415 dstY -= minYOffset;
416 frameRect.offset(-minXOffset, -minYOffset);
417 subset.offset(-minXOffset, -minYOffset);
418
419 // Just like we require that the requested subset x and y offset are even, libwebp
420 // guarantees that the frame x and y offset are even (it's actually impossible to specify
421 // an odd frame offset). So we can still guarantee that the adjusted offsets are even.
422 SkASSERT(SkIsAlign2(subset.fLeft) && SkIsAlign2(subset.fTop));
423
424 SkIRect intersection;
425 SkAssertResult(intersection.intersect(frameRect, subset));
426 subsetWidth = intersection.width();
427 subsetHeight = intersection.height();
428
429 config.options.use_cropping = 1;
430 config.options.crop_left = subset.x();
431 config.options.crop_top = subset.y();
432 config.options.crop_width = subsetWidth;
433 config.options.crop_height = subsetHeight;
434 }
435
436 // Ignore the frame size and offset when determining if scaling is necessary.
437 int scaledWidth = subsetWidth;
438 int scaledHeight = subsetHeight;
439 SkISize srcSize = options.fSubset ? options.fSubset->size() : this->dimensions();
440 if (srcSize != dstInfo.dimensions()) {
441 config.options.use_scaling = 1;
442
443 if (frameIsSubset) {
444 float scaleX = ((float) dstInfo.width()) / srcSize.width();
445 float scaleY = ((float) dstInfo.height()) / srcSize.height();
446
447 // We need to be conservative here and floor rather than round.
448 // Otherwise, we may find ourselves decoding off the end of memory.
449 dstX = scaleX * dstX;
450 scaledWidth = scaleX * scaledWidth;
451 dstY = scaleY * dstY;
452 scaledHeight = scaleY * scaledHeight;
453 if (0 == scaledWidth || 0 == scaledHeight) {
454 return kSuccess;
455 }
456 } else {
457 scaledWidth = dstInfo.width();
458 scaledHeight = dstInfo.height();
459 }
460
461 config.options.scaled_width = scaledWidth;
462 config.options.scaled_height = scaledHeight;
463 }
464
465 const bool blendWithPrevFrame = !independent && frame.blend_method == WEBP_MUX_BLEND
466 && frame.has_alpha;
467
468 SkBitmap webpDst;
469 auto webpInfo = dstInfo;
470 if (!frame.has_alpha) {
471 webpInfo = webpInfo.makeAlphaType(kOpaque_SkAlphaType);
472 }
473 if (this->colorXform()) {
474 // Swizzling between RGBA and BGRA is zero cost in a color transform. So when we have a
475 // color transform, we should decode to whatever is easiest for libwebp, and then let the
476 // color transform swizzle if necessary.
477 // Lossy webp is encoded as YUV (so RGBA and BGRA are the same cost). Lossless webp is
478 // encoded as BGRA. This means decoding to BGRA is either faster or the same cost as RGBA.
479 webpInfo = webpInfo.makeColorType(kBGRA_8888_SkColorType);
480
481 if (webpInfo.alphaType() == kPremul_SkAlphaType) {
482 webpInfo = webpInfo.makeAlphaType(kUnpremul_SkAlphaType);
483 }
484 }
485
486 if ((this->colorXform() && !is_8888(dstInfo.colorType())) || blendWithPrevFrame) {
487 // We will decode the entire image and then perform the color transform. libwebp
488 // does not provide a row-by-row API. This is a shame particularly when we do not want
489 // 8888, since we will need to create another image sized buffer.
490 webpDst.allocPixels(webpInfo);
491 } else {
492 // libwebp can decode directly into the output memory.
493 webpDst.installPixels(webpInfo, dst, rowBytes);
494 }
495
496 config.output.colorspace = webp_decode_mode(webpInfo.colorType(),
497 frame.has_alpha && dstInfo.alphaType() == kPremul_SkAlphaType && !this->colorXform());
498 config.output.is_external_memory = 1;
499
500 config.output.u.RGBA.rgba = reinterpret_cast<uint8_t*>(webpDst.getAddr(dstX, dstY));
501 config.output.u.RGBA.stride = static_cast<int>(webpDst.rowBytes());
502 config.output.u.RGBA.size = webpDst.computeByteSize();
503
504 SkAutoTCallVProc<WebPIDecoder, WebPIDelete> idec(WebPIDecode(nullptr, 0, &config));
505 if (!idec) {
506 return kInvalidInput;
507 }
508
509 int rowsDecoded = 0;
510 SkCodec::Result result;
511 switch (WebPIUpdate(idec, frame.fragment.bytes, frame.fragment.size)) {
512 case VP8_STATUS_OK:
513 rowsDecoded = scaledHeight;
514 result = kSuccess;
515 break;
516 case VP8_STATUS_SUSPENDED:
517 if (!WebPIDecGetRGB(idec, &rowsDecoded, nullptr, nullptr, nullptr)
518 || rowsDecoded <= 0) {
519 return kInvalidInput;
520 }
521 *rowsDecodedPtr = rowsDecoded + dstY;
522 result = kIncompleteInput;
523 break;
524 default:
525 return kInvalidInput;
526 }
527
528 const size_t dstBpp = dstInfo.bytesPerPixel();
529 dst = SkTAddOffset<void>(dst, dstBpp * dstX + rowBytes * dstY);
530 const size_t srcRowBytes = config.output.u.RGBA.stride;
531
532 const auto dstCT = dstInfo.colorType();
533 if (this->colorXform()) {
534 uint32_t* xformSrc = (uint32_t*) config.output.u.RGBA.rgba;
535 SkBitmap tmp;
536 void* xformDst;
537
538 if (blendWithPrevFrame) {
539 // Xform into temporary bitmap big enough for one row.
540 tmp.allocPixels(dstInfo.makeWH(scaledWidth, 1));
541 xformDst = tmp.getPixels();
542 } else {
543 xformDst = dst;
544 }
545
546 for (int y = 0; y < rowsDecoded; y++) {
547 this->applyColorXform(xformDst, xformSrc, scaledWidth);
548 if (blendWithPrevFrame) {
549 blend_line(dstCT, dst, dstCT, xformDst,
550 dstInfo.alphaType(), frame.has_alpha, scaledWidth);
551 dst = SkTAddOffset<void>(dst, rowBytes);
552 } else {
553 xformDst = SkTAddOffset<void>(xformDst, rowBytes);
554 }
555 xformSrc = SkTAddOffset<uint32_t>(xformSrc, srcRowBytes);
556 }
557 } else if (blendWithPrevFrame) {
558 const uint8_t* src = config.output.u.RGBA.rgba;
559
560 for (int y = 0; y < rowsDecoded; y++) {
561 blend_line(dstCT, dst, webpDst.colorType(), src,
562 dstInfo.alphaType(), frame.has_alpha, scaledWidth);
563 src = SkTAddOffset<const uint8_t>(src, srcRowBytes);
564 dst = SkTAddOffset<void>(dst, rowBytes);
565 }
566 }
567
568 return result;
569 }
570
SkWebpCodec(SkEncodedInfo && info,std::unique_ptr<SkStream> stream,WebPDemuxer * demux,sk_sp<SkData> data,SkEncodedOrigin origin)571 SkWebpCodec::SkWebpCodec(SkEncodedInfo&& info, std::unique_ptr<SkStream> stream,
572 WebPDemuxer* demux, sk_sp<SkData> data, SkEncodedOrigin origin)
573 : INHERITED(std::move(info), skcms_PixelFormat_BGRA_8888, std::move(stream),
574 origin)
575 , fDemux(demux)
576 , fData(std::move(data))
577 , fFailed(false)
578 {
579 const auto& eInfo = this->getEncodedInfo();
580 fFrameHolder.setScreenSize(eInfo.width(), eInfo.height());
581 }
582