1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 #ifndef SkMaskSwizzler_DEFINED 8 #define SkMaskSwizzler_DEFINED 9 10 #include "SkMasks.h" 11 #include "SkSampler.h" 12 #include "SkSwizzler.h" 13 #include "SkTypes.h" 14 15 /* 16 * 17 * Used to swizzle images whose pixel components are extracted by bit masks 18 * Currently only used by bmp 19 * 20 */ 21 class SkMaskSwizzler : public SkSampler { 22 public: 23 24 /* 25 * @param masks Unowned pointer to helper class 26 */ 27 static SkMaskSwizzler* CreateMaskSwizzler(const SkImageInfo& dstInfo, 28 bool srcIsOpaque, 29 SkMasks* masks, 30 uint32_t bitsPerPixel, 31 const SkCodec::Options& options); 32 33 /* 34 * Swizzle a row 35 */ 36 void swizzle(void* dst, const uint8_t* SK_RESTRICT src); 37 fillWidth()38 int fillWidth() const override { 39 return fDstWidth; 40 } 41 42 /** 43 * Returns the byte offset at which we write to destination memory, taking 44 * scaling, subsetting, and partial frames into account. 45 * A similar function exists on SkSwizzler. 46 */ swizzleWidth()47 int swizzleWidth() const { return fDstWidth; } 48 49 private: 50 51 /* 52 * Row procedure used for swizzle 53 */ 54 typedef void (*RowProc)(void* dstRow, const uint8_t* srcRow, int width, 55 SkMasks* masks, uint32_t startX, uint32_t sampleX); 56 57 SkMaskSwizzler(SkMasks* masks, RowProc proc, int subsetWidth, int srcOffset); 58 59 int onSetSampleX(int) override; 60 61 SkMasks* fMasks; // unowned 62 const RowProc fRowProc; 63 64 // FIXME: Can this class share more with SkSwizzler? These variables are all the same. 65 const int fSubsetWidth; // Width of the subset of source before any sampling. 66 int fDstWidth; // Width of dst, which may differ with sampling. 67 int fSampleX; 68 int fSrcOffset; 69 int fX0; 70 }; 71 72 #endif 73