blob: 4cac41905cae3a1437c5bf59260a376d0bd8bb7c [file] [log] [blame]
* 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 "include/codec/SkCodec.h"
#include "include/core/SkTypes.h"
#include "src/codec/SkSampler.h"
#include <cstdint>
class SkMasks;
struct SkImageInfo;
* Used to swizzle images whose pixel components are extracted by bit masks
* Currently only used by bmp
class SkMaskSwizzler : public SkSampler {
* @param masks Unowned pointer to helper class
static SkMaskSwizzler* CreateMaskSwizzler(const SkImageInfo& dstInfo,
bool srcIsOpaque,
SkMasks* masks,
uint32_t bitsPerPixel,
const SkCodec::Options& options);
* Swizzle a row
void swizzle(void* dst, const uint8_t* SK_RESTRICT src);
int fillWidth() const override {
return fDstWidth;
* 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;