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* 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 {
// Assumes IsWebp was called and returned true.
static SkCodec* NewFromStream(SkStream*, Result*);
static bool IsWebp(const void*, size_t);
Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, 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;
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 {
Frame(int i, bool alpha)
, fReportsAlpha(alpha)
Frame(Frame&& other)
: INHERITED(other.frameId())
, fReportsAlpha(other.fReportsAlpha)
bool onReportsAlpha() const override {
return fReportsAlpha;
const bool fReportsAlpha;
typedef SkFrame INHERITED;
class FrameHolder : public SkFrameHolder {
~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) {
const SkFrame* onGetFrame(int i) const override;
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