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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 SkMaskSwizzler_DEFINED
#define SkMaskSwizzler_DEFINED
#include "SkMasks.h"
#include "SkSampler.h"
#include "SkSwizzler.h"
#include "SkTypes.h"
* Used to swizzle images whose pixel components are extracted by bit masks
* Currently only used by bmp
class SkMaskSwizzler : public SkSampler {
* Create a new swizzler
* @param masks Unowned pointer to helper class
static SkMaskSwizzler* CreateMaskSwizzler(const SkImageInfo& dstInfo,
const SkImageInfo& srcInfo,
SkMasks* masks,
uint32_t bitsPerPixel,
const SkCodec::Options& options);
* Swizzle a row
void swizzle(void* dst, const uint8_t* SK_RESTRICT src);
* Implement fill using a custom width.
void fill(const SkImageInfo& info, void* dst, size_t rowBytes, uint64_t colorOrIndex,
SkCodec::ZeroInitialized zeroInit) override {
const SkImageInfo fillInfo = info.makeWH(fDstWidth, info.height());
SkSampler::Fill(fillInfo, dst, rowBytes, colorOrIndex, zeroInit);
* Returns the byte offset at which we write to destination memory, taking
* scaling, subsetting, and partial frames into account.
* A similar function exists on SkSwizzler.
int swizzleWidth() const { return fDstWidth; }
* Row procedure used for swizzle
typedef void (*RowProc)(void* dstRow, const uint8_t* srcRow, int width,
SkMasks* masks, uint32_t startX, uint32_t sampleX);
SkMaskSwizzler(SkMasks* masks, RowProc proc, int subsetWidth, int srcOffset);
int onSetSampleX(int) override;
SkMasks* fMasks; // unowned
const RowProc fRowProc;
// FIXME: Can this class share more with SkSwizzler? These variables are all the same.
const int fSubsetWidth; // Width of the subset of source before any sampling.
int fDstWidth; // Width of dst, which may differ with sampling.
int fSampleX;
int fSrcOffset;
int fX0;