| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkWebpCodec_DEFINED |
| #define SkWebpCodec_DEFINED |
| |
| #include "SkCodec.h" |
| #include "SkColorSpace.h" |
| #include "SkEncodedImageFormat.h" |
| #include "SkFrameHolder.h" |
| #include "SkImageInfo.h" |
| #include "SkTypes.h" |
| |
| #include <vector> |
| |
| class SkStream; |
| extern "C" { |
| struct WebPDemuxer; |
| void WebPDemuxDelete(WebPDemuxer* dmux); |
| } |
| |
| static const size_t WEBP_VP8_HEADER_SIZE = 30; |
| |
| class SkWebpCodec final : public SkCodec { |
| public: |
| // Assumes IsWebp was called and returned true. |
| static SkCodec* NewFromStream(SkStream*); |
| static bool IsWebp(const void*, size_t); |
| protected: |
| Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*) |
| override; |
| SkEncodedImageFormat onGetEncodedFormat() const override { return SkEncodedImageFormat::kWEBP; } |
| |
| SkISize onGetScaledDimensions(float desiredScale) const override; |
| |
| bool onDimensionsSupported(const SkISize&) override; |
| |
| bool onGetValidSubset(SkIRect* /* desiredSubset */) const override; |
| |
| int onGetFrameCount() override; |
| bool onGetFrameInfo(int, FrameInfo*) const override; |
| int onGetRepetitionCount() override; |
| |
| const SkFrameHolder* getFrameHolder() const override { |
| return &fFrameHolder; |
| } |
| |
| private: |
| SkWebpCodec(int width, int height, const SkEncodedInfo&, sk_sp<SkColorSpace>, SkStream*, |
| WebPDemuxer*, sk_sp<SkData>); |
| |
| SkAutoTCallVProc<WebPDemuxer, WebPDemuxDelete> fDemux; |
| |
| // fDemux has a pointer into this data. |
| // This should not be freed until the decode is completed. |
| sk_sp<SkData> fData; |
| |
| class Frame : public SkFrame { |
| public: |
| Frame(int i, bool alpha) |
| : INHERITED(i) |
| , fReportsAlpha(alpha) |
| {} |
| Frame(Frame&& other) |
| : INHERITED(other.frameId()) |
| , fReportsAlpha(other.fReportsAlpha) |
| {} |
| |
| protected: |
| bool onReportsAlpha() const override { |
| return fReportsAlpha; |
| } |
| |
| private: |
| const bool fReportsAlpha; |
| |
| typedef SkFrame INHERITED; |
| }; |
| |
| class FrameHolder : public SkFrameHolder { |
| public: |
| ~FrameHolder() override {} |
| void setScreenSize(int w, int h) { |
| fScreenWidth = w; |
| fScreenHeight = h; |
| } |
| Frame* appendNewFrame(bool hasAlpha); |
| const Frame* frame(int i) const; |
| int size() const { |
| return static_cast<int>(fFrames.size()); |
| } |
| void reserve(int size) { |
| fFrames.reserve(size); |
| } |
| |
| protected: |
| const SkFrame* onGetFrame(int i) const override; |
| |
| private: |
| std::vector<Frame> fFrames; |
| }; |
| |
| FrameHolder fFrameHolder; |
| // Set to true if WebPDemuxGetFrame fails. This only means |
| // that we will cap the frame count to the frames that |
| // succeed. |
| bool fFailed; |
| |
| typedef SkCodec INHERITED; |
| }; |
| #endif // SkWebpCodec_DEFINED |