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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 "SkCodec.h"
#include "SkImageInfo.h"
#include "SkStream.h"
#include "SkTArray.h"
#include "SkTypes.h"
/*
* This class implements the decoding for bmp images
*/
class SkIcoCodec : public SkCodec {
public:
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*);
protected:
/*
* 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;
private:
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(int width, int height, const SkEncodedInfo& info,
SkTArray<std::unique_ptr<SkCodec>, true>* embeddedCodecs, sk_sp<SkColorSpace> colorSpace);
std::unique_ptr<SkTArray<std::unique_ptr<SkCodec>, true>> fEmbeddedCodecs;
// Only used by the scanline decoder. onStartScanlineDecode() will set
// fCurrScanlineCodec to one of the fEmbeddedCodecs, if it can find a
// codec of the appropriate size. We will use fCurrScanlineCodec for
// subsequent calls to onGetScanlines() or onSkipScanlines().
// fCurrScanlineCodec is owned by this class, but should not be an
// std::unique_ptr. It will be deleted by the destructor of fEmbeddedCodecs.
SkCodec* fCurrScanlineCodec;
// Only used by incremental decoder. onStartIncrementalDecode() will set
// fCurrIncrementalCodec to one of the fEmbeddedCodecs, if it can find a
// codec of the appropriate size. We will use fCurrIncrementalCodec for
// subsequent calls to incrementalDecode().
// fCurrIncrementalCodec is owned by this class, but should not be an
// std::unique_ptr. It will be deleted by the destructor of fEmbeddedCodecs.
SkCodec* fCurrIncrementalCodec;
typedef SkCodec INHERITED;
};
#endif // SkIcoCodec_DEFINED
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