| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/codec/SkCodec.h" |
| #include "include/core/SkColorSpace.h" |
| #include "include/core/SkData.h" |
| #include "include/private/SkHalf.h" |
| #include "src/codec/SkBmpCodec.h" |
| #include "src/codec/SkCodecPriv.h" |
| #include "src/codec/SkFrameHolder.h" |
| #ifdef SK_HAS_HEIF_LIBRARY |
| #include "src/codec/SkHeifCodec.h" |
| #endif |
| #include "src/codec/SkIcoCodec.h" |
| #include "src/codec/SkJpegCodec.h" |
| #ifdef SK_HAS_PNG_LIBRARY |
| #include "src/codec/SkPngCodec.h" |
| #endif |
| #include "include/core/SkStream.h" |
| #include "src/codec/SkRawCodec.h" |
| #include "src/codec/SkWbmpCodec.h" |
| #include "src/codec/SkWebpCodec.h" |
| #ifdef SK_HAS_WUFFS_LIBRARY |
| #include "src/codec/SkWuffsCodec.h" |
| #else |
| #include "src/codec/SkGifCodec.h" |
| #endif |
| |
| struct DecoderProc { |
| bool (*IsFormat)(const void*, size_t); |
| std::unique_ptr<SkCodec> (*MakeFromStream)(std::unique_ptr<SkStream>, SkCodec::Result*); |
| }; |
| |
| static std::vector<DecoderProc>* decoders() { |
| static auto* decoders = new std::vector<DecoderProc> { |
| #ifdef SK_HAS_JPEG_LIBRARY |
| { SkJpegCodec::IsJpeg, SkJpegCodec::MakeFromStream }, |
| #endif |
| #ifdef SK_HAS_WEBP_LIBRARY |
| { SkWebpCodec::IsWebp, SkWebpCodec::MakeFromStream }, |
| #endif |
| #ifdef SK_HAS_WUFFS_LIBRARY |
| { SkWuffsCodec_IsFormat, SkWuffsCodec_MakeFromStream }, |
| #else |
| { SkGifCodec::IsGif, SkGifCodec::MakeFromStream }, |
| #endif |
| #ifdef SK_HAS_PNG_LIBRARY |
| { SkIcoCodec::IsIco, SkIcoCodec::MakeFromStream }, |
| #endif |
| { SkBmpCodec::IsBmp, SkBmpCodec::MakeFromStream }, |
| { SkWbmpCodec::IsWbmp, SkWbmpCodec::MakeFromStream }, |
| }; |
| return decoders; |
| } |
| |
| void SkCodec::Register( |
| bool (*peek)(const void*, size_t), |
| std::unique_ptr<SkCodec> (*make)(std::unique_ptr<SkStream>, SkCodec::Result*)) { |
| decoders()->push_back(DecoderProc{peek, make}); |
| } |
| |
| std::unique_ptr<SkCodec> SkCodec::MakeFromStream( |
| std::unique_ptr<SkStream> stream, Result* outResult, |
| SkPngChunkReader* chunkReader, SelectionPolicy selectionPolicy) { |
| Result resultStorage; |
| if (!outResult) { |
| outResult = &resultStorage; |
| } |
| |
| if (!stream) { |
| *outResult = kInvalidInput; |
| return nullptr; |
| } |
| |
| if (selectionPolicy != SelectionPolicy::kPreferStillImage |
| && selectionPolicy != SelectionPolicy::kPreferAnimation) { |
| *outResult = kInvalidParameters; |
| return nullptr; |
| } |
| |
| constexpr size_t bytesToRead = MinBufferedBytesNeeded(); |
| |
| char buffer[bytesToRead]; |
| size_t bytesRead = stream->peek(buffer, bytesToRead); |
| |
| // It is also possible to have a complete image less than bytesToRead bytes |
| // (e.g. a 1 x 1 wbmp), meaning peek() would return less than bytesToRead. |
| // Assume that if bytesRead < bytesToRead, but > 0, the stream is shorter |
| // than bytesToRead, so pass that directly to the decoder. |
| // It also is possible the stream uses too small a buffer for peeking, but |
| // we trust the caller to use a large enough buffer. |
| |
| if (0 == bytesRead) { |
| // TODO: After implementing peek in CreateJavaOutputStreamAdaptor.cpp, this |
| // printf could be useful to notice failures. |
| // SkCodecPrintf("Encoded image data failed to peek!\n"); |
| |
| // It is possible the stream does not support peeking, but does support |
| // rewinding. |
| // Attempt to read() and pass the actual amount read to the decoder. |
| bytesRead = stream->read(buffer, bytesToRead); |
| if (!stream->rewind()) { |
| SkCodecPrintf("Encoded image data could not peek or rewind to determine format!\n"); |
| *outResult = kCouldNotRewind; |
| return nullptr; |
| } |
| } |
| |
| // PNG is special, since we want to be able to supply an SkPngChunkReader. |
| // But this code follows the same pattern as the loop. |
| #ifdef SK_HAS_PNG_LIBRARY |
| if (SkPngCodec::IsPng(buffer, bytesRead)) { |
| return SkPngCodec::MakeFromStream(std::move(stream), outResult, chunkReader); |
| } else |
| #endif |
| { |
| for (DecoderProc proc : *decoders()) { |
| if (proc.IsFormat(buffer, bytesRead)) { |
| return proc.MakeFromStream(std::move(stream), outResult); |
| } |
| } |
| |
| #ifdef SK_HAS_HEIF_LIBRARY |
| if (SkHeifCodec::IsHeif(buffer, bytesRead)) { |
| return SkHeifCodec::MakeFromStream(std::move(stream), selectionPolicy, outResult); |
| } |
| #endif |
| |
| #ifdef SK_CODEC_DECODES_RAW |
| // Try to treat the input as RAW if all the other checks failed. |
| return SkRawCodec::MakeFromStream(std::move(stream), outResult); |
| #endif |
| } |
| |
| if (bytesRead < bytesToRead) { |
| *outResult = kIncompleteInput; |
| } else { |
| *outResult = kUnimplemented; |
| } |
| |
| return nullptr; |
| } |
| |
| std::unique_ptr<SkCodec> SkCodec::MakeFromData(sk_sp<SkData> data, SkPngChunkReader* reader) { |
| if (!data) { |
| return nullptr; |
| } |
| return MakeFromStream(SkMemoryStream::Make(std::move(data)), nullptr, reader); |
| } |
| |
| SkCodec::SkCodec(SkEncodedInfo&& info, XformFormat srcFormat, std::unique_ptr<SkStream> stream, |
| SkEncodedOrigin origin) |
| : fEncodedInfo(std::move(info)) |
| , fSrcXformFormat(srcFormat) |
| , fStream(std::move(stream)) |
| , fNeedsRewind(false) |
| , fOrigin(origin) |
| , fDstInfo() |
| , fOptions() |
| , fCurrScanline(-1) |
| , fStartedIncrementalDecode(false) |
| {} |
| |
| SkCodec::~SkCodec() {} |
| |
| bool SkCodec::conversionSupported(const SkImageInfo& dst, bool srcIsOpaque, bool needsColorXform) { |
| if (!valid_alpha(dst.alphaType(), srcIsOpaque)) { |
| return false; |
| } |
| |
| switch (dst.colorType()) { |
| case kRGBA_8888_SkColorType: |
| case kBGRA_8888_SkColorType: |
| return true; |
| case kRGBA_F16_SkColorType: |
| return dst.colorSpace(); |
| case kRGB_565_SkColorType: |
| return srcIsOpaque; |
| case kGray_8_SkColorType: |
| return SkEncodedInfo::kGray_Color == fEncodedInfo.color() && srcIsOpaque; |
| case kAlpha_8_SkColorType: |
| // conceptually we can convert anything into alpha_8, but we haven't actually coded |
| // all of those other conversions yet. |
| return SkEncodedInfo::kXAlpha_Color == fEncodedInfo.color(); |
| default: |
| return false; |
| } |
| } |
| |
| bool SkCodec::rewindIfNeeded() { |
| // Store the value of fNeedsRewind so we can update it. Next read will |
| // require a rewind. |
| const bool needsRewind = fNeedsRewind; |
| fNeedsRewind = true; |
| if (!needsRewind) { |
| return true; |
| } |
| |
| // startScanlineDecode will need to be called before decoding scanlines. |
| fCurrScanline = -1; |
| // startIncrementalDecode will need to be called before incrementalDecode. |
| fStartedIncrementalDecode = false; |
| |
| // Some codecs do not have a stream. They may hold onto their own data or another codec. |
| // They must handle rewinding themselves. |
| if (fStream && !fStream->rewind()) { |
| return false; |
| } |
| |
| return this->onRewind(); |
| } |
| |
| static SkIRect frame_rect_on_screen(SkIRect frameRect, |
| const SkIRect& screenRect) { |
| if (!frameRect.intersect(screenRect)) { |
| return SkIRect::MakeEmpty(); |
| } |
| |
| return frameRect; |
| } |
| |
| bool zero_rect(const SkImageInfo& dstInfo, void* pixels, size_t rowBytes, |
| SkISize srcDimensions, SkIRect prevRect) { |
| prevRect = frame_rect_on_screen(prevRect, SkIRect::MakeSize(srcDimensions)); |
| if (prevRect.isEmpty()) { |
| return true; |
| } |
| const auto dimensions = dstInfo.dimensions(); |
| if (dimensions != srcDimensions) { |
| SkRect src = SkRect::Make(srcDimensions); |
| SkRect dst = SkRect::Make(dimensions); |
| SkMatrix map = SkMatrix::MakeRectToRect(src, dst, SkMatrix::kCenter_ScaleToFit); |
| SkRect asRect = SkRect::Make(prevRect); |
| if (!map.mapRect(&asRect)) { |
| return false; |
| } |
| asRect.roundIn(&prevRect); |
| if (prevRect.isEmpty()) { |
| // Down-scaling shrank the empty portion to nothing, |
| // so nothing to zero. |
| return true; |
| } |
| } |
| |
| const SkImageInfo info = dstInfo.makeDimensions(prevRect.size()); |
| const size_t bpp = dstInfo.bytesPerPixel(); |
| const size_t offset = prevRect.x() * bpp + prevRect.y() * rowBytes; |
| void* eraseDst = SkTAddOffset<void>(pixels, offset); |
| SkSampler::Fill(info, eraseDst, rowBytes, SkCodec::kNo_ZeroInitialized); |
| return true; |
| } |
| |
| SkCodec::Result SkCodec::handleFrameIndex(const SkImageInfo& info, void* pixels, size_t rowBytes, |
| const Options& options) { |
| const int index = options.fFrameIndex; |
| if (0 == index) { |
| return this->initializeColorXform(info, fEncodedInfo.alpha(), fEncodedInfo.opaque()) |
| ? kSuccess : kInvalidConversion; |
| } |
| |
| if (index < 0) { |
| return kInvalidParameters; |
| } |
| |
| if (options.fSubset) { |
| // If we add support for this, we need to update the code that zeroes |
| // a kRestoreBGColor frame. |
| return kInvalidParameters; |
| } |
| |
| if (index >= this->onGetFrameCount()) { |
| return kIncompleteInput; |
| } |
| |
| const auto* frameHolder = this->getFrameHolder(); |
| SkASSERT(frameHolder); |
| |
| const auto* frame = frameHolder->getFrame(index); |
| SkASSERT(frame); |
| |
| const int requiredFrame = frame->getRequiredFrame(); |
| if (requiredFrame != kNoFrame) { |
| if (options.fPriorFrame != kNoFrame) { |
| // Check for a valid frame as a starting point. Alternatively, we could |
| // treat an invalid frame as not providing one, but rejecting it will |
| // make it easier to catch the mistake. |
| if (options.fPriorFrame < requiredFrame || options.fPriorFrame >= index) { |
| return kInvalidParameters; |
| } |
| const auto* prevFrame = frameHolder->getFrame(options.fPriorFrame); |
| switch (prevFrame->getDisposalMethod()) { |
| case SkCodecAnimation::DisposalMethod::kRestorePrevious: |
| return kInvalidParameters; |
| case SkCodecAnimation::DisposalMethod::kRestoreBGColor: |
| // If a frame after the required frame is provided, there is no |
| // need to clear, since it must be covered by the desired frame. |
| if (options.fPriorFrame == requiredFrame) { |
| SkIRect prevRect = prevFrame->frameRect(); |
| if (!zero_rect(info, pixels, rowBytes, this->dimensions(), prevRect)) { |
| return kInternalError; |
| } |
| } |
| break; |
| default: |
| break; |
| } |
| } else { |
| Options prevFrameOptions(options); |
| prevFrameOptions.fFrameIndex = requiredFrame; |
| prevFrameOptions.fZeroInitialized = kNo_ZeroInitialized; |
| const Result result = this->getPixels(info, pixels, rowBytes, &prevFrameOptions); |
| if (result != kSuccess) { |
| return result; |
| } |
| const auto* prevFrame = frameHolder->getFrame(requiredFrame); |
| const auto disposalMethod = prevFrame->getDisposalMethod(); |
| if (disposalMethod == SkCodecAnimation::DisposalMethod::kRestoreBGColor) { |
| auto prevRect = prevFrame->frameRect(); |
| if (!zero_rect(info, pixels, rowBytes, this->dimensions(), prevRect)) { |
| return kInternalError; |
| } |
| } |
| } |
| } |
| |
| return this->initializeColorXform(info, frame->reportedAlpha(), !frame->hasAlpha()) |
| ? kSuccess : kInvalidConversion; |
| } |
| |
| SkCodec::Result SkCodec::getPixels(const SkImageInfo& dstInfo, void* pixels, size_t rowBytes, |
| const Options* options) { |
| SkImageInfo info = dstInfo; |
| if (!info.colorSpace()) { |
| info = info.makeColorSpace(SkColorSpace::MakeSRGB()); |
| } |
| |
| if (kUnknown_SkColorType == info.colorType()) { |
| return kInvalidConversion; |
| } |
| if (nullptr == pixels) { |
| return kInvalidParameters; |
| } |
| if (rowBytes < info.minRowBytes()) { |
| return kInvalidParameters; |
| } |
| |
| if (!this->rewindIfNeeded()) { |
| return kCouldNotRewind; |
| } |
| |
| // Default options. |
| Options optsStorage; |
| if (nullptr == options) { |
| options = &optsStorage; |
| } else { |
| if (options->fSubset) { |
| SkIRect subset(*options->fSubset); |
| if (!this->onGetValidSubset(&subset) || subset != *options->fSubset) { |
| // FIXME: How to differentiate between not supporting subset at all |
| // and not supporting this particular subset? |
| return kUnimplemented; |
| } |
| } |
| } |
| |
| const Result frameIndexResult = this->handleFrameIndex(info, pixels, rowBytes, |
| *options); |
| if (frameIndexResult != kSuccess) { |
| return frameIndexResult; |
| } |
| |
| // FIXME: Support subsets somehow? Note that this works for SkWebpCodec |
| // because it supports arbitrary scaling/subset combinations. |
| if (!this->dimensionsSupported(info.dimensions())) { |
| return kInvalidScale; |
| } |
| |
| fDstInfo = info; |
| fOptions = *options; |
| |
| // On an incomplete decode, the subclass will specify the number of scanlines that it decoded |
| // successfully. |
| int rowsDecoded = 0; |
| const Result result = this->onGetPixels(info, pixels, rowBytes, *options, &rowsDecoded); |
| |
| // A return value of kIncompleteInput indicates a truncated image stream. |
| // In this case, we will fill any uninitialized memory with a default value. |
| // Some subclasses will take care of filling any uninitialized memory on |
| // their own. They indicate that all of the memory has been filled by |
| // setting rowsDecoded equal to the height. |
| if ((kIncompleteInput == result || kErrorInInput == result) && rowsDecoded != info.height()) { |
| // FIXME: (skbug.com/5772) fillIncompleteImage will fill using the swizzler's width, unless |
| // there is a subset. In that case, it will use the width of the subset. From here, the |
| // subset will only be non-null in the case of SkWebpCodec, but it treats the subset |
| // differenty from the other codecs, and it needs to use the width specified by the info. |
| // Set the subset to null so SkWebpCodec uses the correct width. |
| fOptions.fSubset = nullptr; |
| this->fillIncompleteImage(info, pixels, rowBytes, options->fZeroInitialized, info.height(), |
| rowsDecoded); |
| } |
| |
| return result; |
| } |
| |
| SkCodec::Result SkCodec::startIncrementalDecode(const SkImageInfo& dstInfo, void* pixels, |
| size_t rowBytes, const SkCodec::Options* options) { |
| fStartedIncrementalDecode = false; |
| |
| SkImageInfo info = dstInfo; |
| if (!info.colorSpace()) { |
| info = info.makeColorSpace(SkColorSpace::MakeSRGB()); |
| } |
| if (kUnknown_SkColorType == info.colorType()) { |
| return kInvalidConversion; |
| } |
| if (nullptr == pixels) { |
| return kInvalidParameters; |
| } |
| |
| // FIXME: If the rows come after the rows of a previous incremental decode, |
| // we might be able to skip the rewind, but only the implementation knows |
| // that. (e.g. PNG will always need to rewind, since we called longjmp, but |
| // a bottom-up BMP could skip rewinding if the new rows are above the old |
| // rows.) |
| if (!this->rewindIfNeeded()) { |
| return kCouldNotRewind; |
| } |
| |
| // Set options. |
| Options optsStorage; |
| if (nullptr == options) { |
| options = &optsStorage; |
| } else { |
| if (options->fSubset) { |
| SkIRect size = SkIRect::MakeSize(info.dimensions()); |
| if (!size.contains(*options->fSubset)) { |
| return kInvalidParameters; |
| } |
| |
| const int top = options->fSubset->top(); |
| const int bottom = options->fSubset->bottom(); |
| if (top < 0 || top >= info.height() || top >= bottom || bottom > info.height()) { |
| return kInvalidParameters; |
| } |
| } |
| } |
| |
| const Result frameIndexResult = this->handleFrameIndex(info, pixels, rowBytes, |
| *options); |
| if (frameIndexResult != kSuccess) { |
| return frameIndexResult; |
| } |
| |
| if (!this->dimensionsSupported(info.dimensions())) { |
| return kInvalidScale; |
| } |
| |
| fDstInfo = info; |
| fOptions = *options; |
| |
| const Result result = this->onStartIncrementalDecode(info, pixels, rowBytes, fOptions); |
| if (kSuccess == result) { |
| fStartedIncrementalDecode = true; |
| } else if (kUnimplemented == result) { |
| // FIXME: This is temporarily necessary, until we transition SkCodec |
| // implementations from scanline decoding to incremental decoding. |
| // SkAndroidCodec will first attempt to use incremental decoding, but |
| // will fall back to scanline decoding if incremental returns |
| // kUnimplemented. rewindIfNeeded(), above, set fNeedsRewind to true |
| // (after potentially rewinding), but we do not want the next call to |
| // startScanlineDecode() to do a rewind. |
| fNeedsRewind = false; |
| } |
| return result; |
| } |
| |
| |
| SkCodec::Result SkCodec::startScanlineDecode(const SkImageInfo& dstInfo, |
| const SkCodec::Options* options) { |
| // Reset fCurrScanline in case of failure. |
| fCurrScanline = -1; |
| |
| SkImageInfo info = dstInfo; |
| if (!info.colorSpace()) { |
| info = info.makeColorSpace(SkColorSpace::MakeSRGB()); |
| } |
| |
| if (!this->rewindIfNeeded()) { |
| return kCouldNotRewind; |
| } |
| |
| // Set options. |
| Options optsStorage; |
| if (nullptr == options) { |
| options = &optsStorage; |
| } else if (options->fSubset) { |
| SkIRect size = SkIRect::MakeSize(info.dimensions()); |
| if (!size.contains(*options->fSubset)) { |
| return kInvalidInput; |
| } |
| |
| // We only support subsetting in the x-dimension for scanline decoder. |
| // Subsetting in the y-dimension can be accomplished using skipScanlines(). |
| if (options->fSubset->top() != 0 || options->fSubset->height() != info.height()) { |
| return kInvalidInput; |
| } |
| } |
| |
| // Scanline decoding only supports decoding the first frame. |
| if (options->fFrameIndex != 0) { |
| return kUnimplemented; |
| } |
| |
| // The void* dst and rowbytes in handleFrameIndex or only used for decoding prior |
| // frames, which is not supported here anyway, so it is safe to pass nullptr/0. |
| const Result frameIndexResult = this->handleFrameIndex(info, nullptr, 0, *options); |
| if (frameIndexResult != kSuccess) { |
| return frameIndexResult; |
| } |
| |
| // FIXME: Support subsets somehow? |
| if (!this->dimensionsSupported(info.dimensions())) { |
| return kInvalidScale; |
| } |
| |
| const Result result = this->onStartScanlineDecode(info, *options); |
| if (result != SkCodec::kSuccess) { |
| return result; |
| } |
| |
| fCurrScanline = 0; |
| fDstInfo = info; |
| fOptions = *options; |
| return kSuccess; |
| } |
| |
| int SkCodec::getScanlines(void* dst, int countLines, size_t rowBytes) { |
| if (fCurrScanline < 0) { |
| return 0; |
| } |
| |
| SkASSERT(!fDstInfo.isEmpty()); |
| if (countLines <= 0 || fCurrScanline + countLines > fDstInfo.height()) { |
| return 0; |
| } |
| |
| const int linesDecoded = this->onGetScanlines(dst, countLines, rowBytes); |
| if (linesDecoded < countLines) { |
| this->fillIncompleteImage(this->dstInfo(), dst, rowBytes, this->options().fZeroInitialized, |
| countLines, linesDecoded); |
| } |
| fCurrScanline += countLines; |
| return linesDecoded; |
| } |
| |
| bool SkCodec::skipScanlines(int countLines) { |
| if (fCurrScanline < 0) { |
| return false; |
| } |
| |
| SkASSERT(!fDstInfo.isEmpty()); |
| if (countLines < 0 || fCurrScanline + countLines > fDstInfo.height()) { |
| // Arguably, we could just skip the scanlines which are remaining, |
| // and return true. We choose to return false so the client |
| // can catch their bug. |
| return false; |
| } |
| |
| bool result = this->onSkipScanlines(countLines); |
| fCurrScanline += countLines; |
| return result; |
| } |
| |
| int SkCodec::outputScanline(int inputScanline) const { |
| SkASSERT(0 <= inputScanline && inputScanline < fEncodedInfo.height()); |
| return this->onOutputScanline(inputScanline); |
| } |
| |
| int SkCodec::onOutputScanline(int inputScanline) const { |
| switch (this->getScanlineOrder()) { |
| case kTopDown_SkScanlineOrder: |
| return inputScanline; |
| case kBottomUp_SkScanlineOrder: |
| return fEncodedInfo.height() - inputScanline - 1; |
| default: |
| // This case indicates an interlaced gif and is implemented by SkGifCodec. |
| SkASSERT(false); |
| return 0; |
| } |
| } |
| |
| void SkCodec::fillIncompleteImage(const SkImageInfo& info, void* dst, size_t rowBytes, |
| ZeroInitialized zeroInit, int linesRequested, int linesDecoded) { |
| if (kYes_ZeroInitialized == zeroInit) { |
| return; |
| } |
| |
| const int linesRemaining = linesRequested - linesDecoded; |
| SkSampler* sampler = this->getSampler(false); |
| |
| const int fillWidth = sampler ? sampler->fillWidth() : |
| fOptions.fSubset ? fOptions.fSubset->width() : |
| info.width() ; |
| void* fillDst = this->getScanlineOrder() == kBottomUp_SkScanlineOrder ? dst : |
| SkTAddOffset<void>(dst, linesDecoded * rowBytes); |
| const auto fillInfo = info.makeWH(fillWidth, linesRemaining); |
| SkSampler::Fill(fillInfo, fillDst, rowBytes, kNo_ZeroInitialized); |
| } |
| |
| bool sk_select_xform_format(SkColorType colorType, bool forColorTable, |
| skcms_PixelFormat* outFormat) { |
| SkASSERT(outFormat); |
| |
| switch (colorType) { |
| case kRGBA_8888_SkColorType: |
| *outFormat = skcms_PixelFormat_RGBA_8888; |
| break; |
| case kBGRA_8888_SkColorType: |
| *outFormat = skcms_PixelFormat_BGRA_8888; |
| break; |
| case kRGB_565_SkColorType: |
| if (forColorTable) { |
| #if defined(STARBOARD) && SB_API_VERSION >= 12 |
| *outFormat = (GetSkPmcolor() == SkPmcolorIsRgba) ? skcms_PixelFormat_RGBA_8888 |
| : skcms_PixelFormat_RGBA_8888; |
| #else |
| #ifdef SK_PMCOLOR_IS_RGBA |
| *outFormat = skcms_PixelFormat_RGBA_8888; |
| #else |
| *outFormat = skcms_PixelFormat_BGRA_8888; |
| #endif |
| #endif |
| break; |
| } |
| *outFormat = skcms_PixelFormat_BGR_565; |
| break; |
| case kRGBA_F16_SkColorType: |
| *outFormat = skcms_PixelFormat_RGBA_hhhh; |
| break; |
| case kGray_8_SkColorType: |
| *outFormat = skcms_PixelFormat_G_8; |
| break; |
| default: |
| return false; |
| } |
| return true; |
| } |
| |
| bool SkCodec::initializeColorXform(const SkImageInfo& dstInfo, SkEncodedInfo::Alpha encodedAlpha, |
| bool srcIsOpaque) { |
| fXformTime = kNo_XformTime; |
| bool needsColorXform = false; |
| if (this->usesColorXform() && dstInfo.colorSpace()) { |
| dstInfo.colorSpace()->toProfile(&fDstProfile); |
| if (kRGBA_F16_SkColorType == dstInfo.colorType()) { |
| needsColorXform = true; |
| } else { |
| const auto* srcProfile = fEncodedInfo.profile(); |
| if (!srcProfile) { |
| srcProfile = skcms_sRGB_profile(); |
| } |
| if (!skcms_ApproximatelyEqualProfiles(srcProfile, &fDstProfile) ) { |
| needsColorXform = true; |
| } |
| } |
| } |
| |
| if (!this->conversionSupported(dstInfo, srcIsOpaque, needsColorXform)) { |
| return false; |
| } |
| |
| if (needsColorXform) { |
| fXformTime = SkEncodedInfo::kPalette_Color != fEncodedInfo.color() |
| || kRGBA_F16_SkColorType == dstInfo.colorType() |
| ? kDecodeRow_XformTime : kPalette_XformTime; |
| if (!sk_select_xform_format(dstInfo.colorType(), fXformTime == kPalette_XformTime, |
| &fDstXformFormat)) { |
| return false; |
| } |
| if (encodedAlpha == SkEncodedInfo::kUnpremul_Alpha |
| && dstInfo.alphaType() == kPremul_SkAlphaType) { |
| fDstXformAlphaFormat = skcms_AlphaFormat_PremulAsEncoded; |
| } else { |
| fDstXformAlphaFormat = skcms_AlphaFormat_Unpremul; |
| } |
| } |
| return true; |
| } |
| |
| void SkCodec::applyColorXform(void* dst, const void* src, int count) const { |
| // It is okay for srcProfile to be null. This will use sRGB. |
| const auto* srcProfile = fEncodedInfo.profile(); |
| SkAssertResult(skcms_Transform(src, fSrcXformFormat, skcms_AlphaFormat_Unpremul, srcProfile, |
| dst, fDstXformFormat, fDstXformAlphaFormat, &fDstProfile, |
| count)); |
| } |
| |
| std::vector<SkCodec::FrameInfo> SkCodec::getFrameInfo() { |
| const int frameCount = this->getFrameCount(); |
| SkASSERT(frameCount >= 0); |
| if (frameCount <= 0) { |
| return std::vector<FrameInfo>{}; |
| } |
| |
| if (frameCount == 1 && !this->onGetFrameInfo(0, nullptr)) { |
| // Not animated. |
| return std::vector<FrameInfo>{}; |
| } |
| |
| std::vector<FrameInfo> result(frameCount); |
| for (int i = 0; i < frameCount; ++i) { |
| SkAssertResult(this->onGetFrameInfo(i, &result[i])); |
| } |
| return result; |
| } |
| |
| const char* SkCodec::ResultToString(Result result) { |
| switch (result) { |
| case kSuccess: |
| return "success"; |
| case kIncompleteInput: |
| return "incomplete input"; |
| case kErrorInInput: |
| return "error in input"; |
| case kInvalidConversion: |
| return "invalid conversion"; |
| case kInvalidScale: |
| return "invalid scale"; |
| case kInvalidParameters: |
| return "invalid parameters"; |
| case kInvalidInput: |
| return "invalid input"; |
| case kCouldNotRewind: |
| return "could not rewind"; |
| case kInternalError: |
| return "internal error"; |
| case kUnimplemented: |
| return "unimplemented"; |
| default: |
| SkASSERT(false); |
| return "bogus result value"; |
| } |
| } |
| |
| static bool independent(const SkFrame& frame) { |
| return frame.getRequiredFrame() == SkCodec::kNoFrame; |
| } |
| |
| static bool restore_bg(const SkFrame& frame) { |
| return frame.getDisposalMethod() == SkCodecAnimation::DisposalMethod::kRestoreBGColor; |
| } |
| |
| // As its name suggests, this method computes a frame's alpha (e.g. completely |
| // opaque, unpremul, binary) and its required frame (a preceding frame that |
| // this frame depends on, to draw the complete image at this frame's point in |
| // the animation stream), and calls this frame's setter methods with that |
| // computed information. |
| // |
| // A required frame of kNoFrame means that this frame is independent: drawing |
| // the complete image at this frame's point in the animation stream does not |
| // require first preparing the pixel buffer based on another frame. Instead, |
| // drawing can start from an uninitialized pixel buffer. |
| // |
| // "Uninitialized" is from the SkCodec's caller's point of view. In the SkCodec |
| // implementation, for independent frames, first party Skia code (in src/codec) |
| // will typically fill the buffer with a uniform background color (e.g. |
| // transparent black) before calling into third party codec-specific code (e.g. |
| // libjpeg or libpng). Pixels outside of the frame's rect will remain this |
| // background color after drawing this frame. For incomplete decodes, pixels |
| // inside that rect may be (at least temporarily) set to that background color. |
| // In an incremental decode, later passes may then overwrite that background |
| // color. |
| // |
| // Determining kNoFrame or otherwise involves testing a number of conditions |
| // sequentially. The first satisfied condition results in setting the required |
| // frame to kNoFrame (an "INDx" condition) or to a non-negative frame number (a |
| // "DEPx" condition), and the function returning early. Those "INDx" and "DEPx" |
| // labels also map to comments in the function body. |
| // |
| // - IND1: this frame is the first frame. |
| // - IND2: this frame fills out the whole image, and it is completely opaque |
| // or it overwrites (not blends with) the previous frame. |
| // - IND3: all preceding frames' disposals are kRestorePrevious. |
| // - IND4: the prevFrame's disposal is kRestoreBGColor, and it fills out the |
| // whole image or it is itself otherwise independent. |
| // - DEP5: this frame reports alpha (it is not completely opaque) and it |
| // blends with (not overwrites) the previous frame. |
| // - IND6: this frame's rect covers the rects of all preceding frames back to |
| // and including the most recent independent frame before this frame. |
| // - DEP7: unconditional. |
| // |
| // The "prevFrame" variable initially points to the previous frame (also known |
| // as the prior frame), but that variable may iterate further backwards over |
| // the course of this computation. |
| void SkFrameHolder::setAlphaAndRequiredFrame(SkFrame* frame) { |
| const bool reportsAlpha = frame->reportedAlpha() != SkEncodedInfo::kOpaque_Alpha; |
| const auto screenRect = SkIRect::MakeWH(fScreenWidth, fScreenHeight); |
| const auto frameRect = frame_rect_on_screen(frame->frameRect(), screenRect); |
| |
| const int i = frame->frameId(); |
| if (0 == i) { |
| frame->setHasAlpha(reportsAlpha || frameRect != screenRect); |
| frame->setRequiredFrame(SkCodec::kNoFrame); // IND1 |
| return; |
| } |
| |
| |
| const bool blendWithPrevFrame = frame->getBlend() == SkCodecAnimation::Blend::kPriorFrame; |
| if ((!reportsAlpha || !blendWithPrevFrame) && frameRect == screenRect) { |
| frame->setHasAlpha(reportsAlpha); |
| frame->setRequiredFrame(SkCodec::kNoFrame); // IND2 |
| return; |
| } |
| |
| const SkFrame* prevFrame = this->getFrame(i-1); |
| while (prevFrame->getDisposalMethod() == SkCodecAnimation::DisposalMethod::kRestorePrevious) { |
| const int prevId = prevFrame->frameId(); |
| if (0 == prevId) { |
| frame->setHasAlpha(true); |
| frame->setRequiredFrame(SkCodec::kNoFrame); // IND3 |
| return; |
| } |
| |
| prevFrame = this->getFrame(prevId - 1); |
| } |
| |
| const bool clearPrevFrame = restore_bg(*prevFrame); |
| auto prevFrameRect = frame_rect_on_screen(prevFrame->frameRect(), screenRect); |
| |
| if (clearPrevFrame) { |
| if (prevFrameRect == screenRect || independent(*prevFrame)) { |
| frame->setHasAlpha(true); |
| frame->setRequiredFrame(SkCodec::kNoFrame); // IND4 |
| return; |
| } |
| } |
| |
| if (reportsAlpha && blendWithPrevFrame) { |
| // Note: We could be more aggressive here. If prevFrame clears |
| // to background color and covers its required frame (and that |
| // frame is independent), prevFrame could be marked independent. |
| // Would this extra complexity be worth it? |
| frame->setRequiredFrame(prevFrame->frameId()); // DEP5 |
| frame->setHasAlpha(prevFrame->hasAlpha() || clearPrevFrame); |
| return; |
| } |
| |
| while (frameRect.contains(prevFrameRect)) { |
| const int prevRequiredFrame = prevFrame->getRequiredFrame(); |
| if (prevRequiredFrame == SkCodec::kNoFrame) { |
| frame->setRequiredFrame(SkCodec::kNoFrame); // IND6 |
| frame->setHasAlpha(true); |
| return; |
| } |
| |
| prevFrame = this->getFrame(prevRequiredFrame); |
| prevFrameRect = frame_rect_on_screen(prevFrame->frameRect(), screenRect); |
| } |
| |
| frame->setRequiredFrame(prevFrame->frameId()); // DEP7 |
| if (restore_bg(*prevFrame)) { |
| frame->setHasAlpha(true); |
| return; |
| } |
| SkASSERT(prevFrame->getDisposalMethod() == SkCodecAnimation::DisposalMethod::kKeep); |
| frame->setHasAlpha(prevFrame->hasAlpha() || (reportsAlpha && !blendWithPrevFrame)); |
| } |
| |
