/*

 * 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 "include/codec/SkEncodedImageFormat.h"

#include "include/codec/SkEncodedOrigin.h"

#include "include/core/SkData.h"

#include "include/core/SkRefCnt.h"

#include "include/core/SkTypes.h"

#include "include/private/SkEncodedInfo.h"

#include "include/private/base/SkTemplates.h"

#include "src/codec/SkFrameHolder.h"

#include "src/codec/SkScalingCodec.h"

#include <cstddef>

#include <memory>

#include <vector>

class SkStream;

class SkCodec;

struct SkIRect;

struct SkImageInfo;

extern "C" {

    struct WebPDemuxer;

    void WebPDemuxDelete(WebPDemuxer* dmux);

}

class SkWebpCodec final : public SkScalingCodec {

public:

    // Assumes IsWebp was called and returned true.

    static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*);

    static bool IsWebp(const void*, size_t);

protected:

    Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, int*) override;

    SkEncodedImageFormat onGetEncodedFormat() const override { return SkEncodedImageFormat::kWEBP; }

    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(SkEncodedInfo&&, std::unique_ptr<SkStream>, WebPDemuxer*, sk_sp<SkData>,

                SkEncodedOrigin);

    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, SkEncodedInfo::Alpha alpha)

            : INHERITED(i)

            , fReportedAlpha(alpha)

        {}

    protected:

        SkEncodedInfo::Alpha onReportedAlpha() const override {

            return fReportedAlpha;

        }

    private:

        const SkEncodedInfo::Alpha fReportedAlpha;

        using INHERITED = SkFrame;

    };

    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;

    using INHERITED = SkScalingCodec;

};

#endif // SkWebpCodec_DEFINED