/*
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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 SkMaskSwizzler_DEFINED
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#define SkMaskSwizzler_DEFINED
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#include "SkMasks.h"
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#include "SkSampler.h"
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#include "SkSwizzler.h"
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#include "SkTypes.h"
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/*
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*
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* Used to swizzle images whose pixel components are extracted by bit masks
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* Currently only used by bmp
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*
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*/
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class SkMaskSwizzler : public SkSampler {
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public:
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/*
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* @param masks Unowned pointer to helper class
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*/
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static SkMaskSwizzler* CreateMaskSwizzler(const SkImageInfo& dstInfo,
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bool srcIsOpaque,
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SkMasks* masks,
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uint32_t bitsPerPixel,
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const SkCodec::Options& options);
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/*
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* Swizzle a row
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*/
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void swizzle(void* dst, const uint8_t* SK_RESTRICT src);
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int fillWidth() const override {
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return fDstWidth;
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}
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/**
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* Returns the byte offset at which we write to destination memory, taking
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* scaling, subsetting, and partial frames into account.
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* A similar function exists on SkSwizzler.
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*/
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int swizzleWidth() const { return fDstWidth; }
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private:
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/*
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* Row procedure used for swizzle
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*/
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typedef void (*RowProc)(void* dstRow, const uint8_t* srcRow, int width,
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SkMasks* masks, uint32_t startX, uint32_t sampleX);
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SkMaskSwizzler(SkMasks* masks, RowProc proc, int subsetWidth, int srcOffset);
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int onSetSampleX(int) override;
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SkMasks* fMasks; // unowned
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const RowProc fRowProc;
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// FIXME: Can this class share more with SkSwizzler? These variables are all the same.
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const int fSubsetWidth; // Width of the subset of source before any sampling.
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int fDstWidth; // Width of dst, which may differ with sampling.
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int fSampleX;
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int fSrcOffset;
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int fX0;
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};
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#endif
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