/*
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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 SkBmpMaskCodec_DEFINED
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#define SkBmpMaskCodec_DEFINED
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#include "SkBmpBaseCodec.h"
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#include "SkImageInfo.h"
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#include "SkMaskSwizzler.h"
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#include "SkTypes.h"
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/*
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* This class implements the decoding for bmp images using bit masks
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*/
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class SkBmpMaskCodec : public SkBmpBaseCodec {
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public:
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/*
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* Creates an instance of the decoder
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*
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* Called only by SkBmpCodec::MakeFromStream
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* There should be no other callers despite this being public
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*
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* @param info contains properties of the encoded data
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* @param stream the stream of encoded image data
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* @param bitsPerPixel the number of bits used to store each pixel
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* @param masks color masks for certain bmp formats
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* @param rowOrder indicates whether rows are ordered top-down or bottom-up
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*/
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SkBmpMaskCodec(SkEncodedInfo&& info, std::unique_ptr<SkStream>,
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uint16_t bitsPerPixel, SkMasks* masks,
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SkCodec::SkScanlineOrder rowOrder);
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protected:
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Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
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size_t dstRowBytes, const Options&,
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int*) override;
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SkCodec::Result onPrepareToDecode(const SkImageInfo& dstInfo,
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const SkCodec::Options& options) override;
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private:
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SkSampler* getSampler(bool createIfNecessary) override {
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SkASSERT(fMaskSwizzler);
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return fMaskSwizzler.get();
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}
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int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
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const Options& opts) override;
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std::unique_ptr<SkMasks> fMasks;
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std::unique_ptr<SkMaskSwizzler> fMaskSwizzler;
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typedef SkBmpBaseCodec INHERITED;
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};
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#endif // SkBmpMaskCodec_DEFINED
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