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