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/*
* Copyright 2022 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAvifCodec_DEFINED
#define SkAvifCodec_DEFINED
#include "include/codec/SkCodec.h"
#include "include/codec/SkEncodedOrigin.h"
#include "include/core/SkData.h"
#include "include/core/SkEncodedImageFormat.h"
#include "include/core/SkRefCnt.h"
#include "include/private/SkEncodedInfo.h"
#include "src/codec/SkFrameHolder.h"
#include "src/codec/SkScalingCodec.h"
#include <cstddef>
#include <memory>
#include <vector>
class SkStream;
struct SkImageInfo;
struct avifDecoder;
struct AvifDecoderDeleter {
void operator()(avifDecoder* decoder) const;
};
using AvifDecoder = std::unique_ptr<avifDecoder, AvifDecoderDeleter>;
class SkAvifCodec : public SkScalingCodec {
public:
/*
* Returns true if an AVIF image is detected. Returns false otherwise.
*/
static bool IsAvif(const void*, size_t);
/*
* Assumes IsAvif() was called and it returned true.
*/
static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*);
protected:
Result onGetPixels(const SkImageInfo& dstInfo,
void* dst,
size_t dstRowBytes,
const Options& options,
int* rowsDecoded) override;
SkEncodedImageFormat onGetEncodedFormat() const override { return SkEncodedImageFormat::kAVIF; }
int onGetFrameCount() override;
bool onGetFrameInfo(int, FrameInfo*) const override;
int onGetRepetitionCount() override;
const SkFrameHolder* getFrameHolder() const override { return &fFrameHolder; }
private:
SkAvifCodec(SkEncodedInfo&&,
std::unique_ptr<SkStream>,
sk_sp<SkData>,
AvifDecoder,
SkEncodedOrigin,
bool);
// fAvifDecoder has a pointer to this data. This should not be freed until
// the decode is completed. To ensure that, we declare this before
// fAvifDecoder.
sk_sp<SkData> fData;
AvifDecoder fAvifDecoder;
bool fUseAnimation;
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;
using INHERITED = SkScalingCodec;
};
#endif // SkAvifCodec_DEFINED