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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 SkIcoCodec_DEFINED
#define SkIcoCodec_DEFINED
#include "include/codec/SkCodec.h"
#include "include/codec/SkEncodedImageFormat.h"
#include "include/core/SkSize.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkTArray.h"
#include <cstddef>
#include <memory>
class SkSampler;
class SkStream;
struct SkEncodedInfo;
struct SkImageInfo;
* This class implements the decoding for bmp images
class SkIcoCodec : public SkCodec {
static bool IsIco(const void*, size_t);
* Assumes IsIco was called and returned true
* Creates an Ico decoder
* Reads enough of the stream to determine the image format
static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*);
* Chooses the best dimensions given the desired scale
SkISize onGetScaledDimensions(float desiredScale) const override;
bool onDimensionsSupported(const SkISize&) override;
* Initiates the Ico decode
Result onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options&,
int*) override;
SkEncodedImageFormat onGetEncodedFormat() const override {
return SkEncodedImageFormat::kICO;
SkScanlineOrder onGetScanlineOrder() const override;
bool conversionSupported(const SkImageInfo&, bool, bool) override {
// This will be checked by the embedded codec.
return true;
// Handled by the embedded codec.
bool usesColorXform() const override { return false; }
Result onStartScanlineDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options) override;
int onGetScanlines(void* dst, int count, size_t rowBytes) override;
bool onSkipScanlines(int count) override;
Result onStartIncrementalDecode(const SkImageInfo& dstInfo, void* pixels, size_t rowBytes,
const SkCodec::Options&) override;
Result onIncrementalDecode(int* rowsDecoded) override;
SkSampler* getSampler(bool createIfNecessary) override;
* Searches fEmbeddedCodecs for a codec that matches requestedSize.
* The search starts at startIndex and ends when an appropriate codec
* is found, or we have reached the end of the array.
* @return the index of the matching codec or -1 if there is no
* matching codec between startIndex and the end of
* the array.
int chooseCodec(const SkISize& requestedSize, int startIndex);
* Constructor called by NewFromStream
* @param embeddedCodecs codecs for the embedded images, takes ownership
SkIcoCodec(SkEncodedInfo&& info,
std::unique_ptr<skia_private::TArray<std::unique_ptr<SkCodec>>> embeddedCodecs);
std::unique_ptr<skia_private::TArray<std::unique_ptr<SkCodec>>> fEmbeddedCodecs;
// fCurrCodec is owned by this class, but should not be an
// std::unique_ptr. It will be deleted by the destructor of fEmbeddedCodecs.
SkCodec* fCurrCodec;
using INHERITED = SkCodec;
#endif // SkIcoCodec_DEFINED