/*
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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 SkCodec_wbmp_DEFINED
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#define SkCodec_wbmp_DEFINED
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#include "SkCodec.h"
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#include "SkColorSpace.h"
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#include "SkSwizzler.h"
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class SkWbmpCodec final : public SkCodec {
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public:
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static bool IsWbmp(const void*, size_t);
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/*
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* Assumes IsWbmp was called and returned true
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* Creates a wbmp codec
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* Takes ownership of the stream
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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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SkEncodedImageFormat onGetEncodedFormat() const override;
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Result onGetPixels(const SkImageInfo&, void*, size_t,
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const Options&, int*) override;
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bool onRewind() override;
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bool conversionSupported(const SkImageInfo& dst, bool srcIsOpaque,
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bool needsXform) override;
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// No need to Xform; all pixels are either black or white.
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bool usesColorXform() const override { return false; }
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private:
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SkSampler* getSampler(bool createIfNecessary) override {
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SkASSERT(fSwizzler || !createIfNecessary);
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return fSwizzler.get();
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}
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/*
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* Read a src row from the encoded stream
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*/
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bool readRow(uint8_t* row);
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SkWbmpCodec(SkEncodedInfo&&, std::unique_ptr<SkStream>);
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const size_t fSrcRowBytes;
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// Used for scanline decodes:
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std::unique_ptr<SkSwizzler> fSwizzler;
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SkAutoTMalloc<uint8_t> fSrcBuffer;
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int onGetScanlines(void* dst, int count, size_t dstRowBytes) override;
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bool onSkipScanlines(int count) override;
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Result onStartScanlineDecode(const SkImageInfo& dstInfo,
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const Options& options) override;
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typedef SkCodec INHERITED;
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};
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#endif // SkCodec_wbmp_DEFINED
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