/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkIcoCodec_DEFINED
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#define SkIcoCodec_DEFINED
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#include "SkCodec.h"
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#include "SkImageInfo.h"
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#include "SkStream.h"
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#include "SkTArray.h"
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#include "SkTypes.h"
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/*
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* This class implements the decoding for bmp images
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*/
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class SkIcoCodec : public SkCodec {
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public:
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static bool IsIco(const void*, size_t);
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/*
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* Assumes IsIco was called and returned true
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* Creates an Ico decoder
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* Reads enough of the stream to determine the image format
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*/
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static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*);
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protected:
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/*
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* Chooses the best dimensions given the desired scale
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*/
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SkISize onGetScaledDimensions(float desiredScale) const override;
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bool onDimensionsSupported(const SkISize&) override;
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/*
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* Initiates the Ico decode
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*/
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Result onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options&,
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int*) override;
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SkEncodedImageFormat onGetEncodedFormat() const override {
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return SkEncodedImageFormat::kICO;
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}
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SkScanlineOrder onGetScanlineOrder() const override;
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bool conversionSupported(const SkImageInfo&, bool, bool) override {
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// This will be checked by the embedded codec.
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return true;
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}
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// Handled by the embedded codec.
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bool usesColorXform() const override { return false; }
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private:
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Result onStartScanlineDecode(const SkImageInfo& dstInfo,
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const SkCodec::Options& options) override;
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int onGetScanlines(void* dst, int count, size_t rowBytes) override;
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bool onSkipScanlines(int count) override;
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Result onStartIncrementalDecode(const SkImageInfo& dstInfo, void* pixels, size_t rowBytes,
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const SkCodec::Options&) override;
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Result onIncrementalDecode(int* rowsDecoded) override;
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SkSampler* getSampler(bool createIfNecessary) override;
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/*
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* Searches fEmbeddedCodecs for a codec that matches requestedSize.
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* The search starts at startIndex and ends when an appropriate codec
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* is found, or we have reached the end of the array.
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*
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* @return the index of the matching codec or -1 if there is no
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* matching codec between startIndex and the end of
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* the array.
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*/
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int chooseCodec(const SkISize& requestedSize, int startIndex);
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/*
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* Constructor called by NewFromStream
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* @param embeddedCodecs codecs for the embedded images, takes ownership
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*/
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SkIcoCodec(SkEncodedInfo&& info, SkTArray<std::unique_ptr<SkCodec>, true>* embeddedCodecs);
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std::unique_ptr<SkTArray<std::unique_ptr<SkCodec>, true>> fEmbeddedCodecs;
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// fCurrCodec is owned by this class, but should not be an
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// std::unique_ptr. It will be deleted by the destructor of fEmbeddedCodecs.
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SkCodec* fCurrCodec;
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typedef SkCodec INHERITED;
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};
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#endif // SkIcoCodec_DEFINED
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