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 SkMasks_DEFINED 8 #define SkMasks_DEFINED 9 10 #include "SkTypes.h" 11 12 /* 13 * 14 * Contains useful mask routines for SkMaskSwizzler 15 * 16 */ 17 class SkMasks { 18 public: 19 20 /* 21 * 22 * Input bit masks format 23 * 24 */ 25 struct InputMasks { 26 uint32_t red; 27 uint32_t green; 28 uint32_t blue; 29 uint32_t alpha; 30 }; 31 32 /* 33 * 34 * Contains all of the information for a single mask 35 * 36 */ 37 struct MaskInfo { 38 uint32_t mask; 39 uint32_t shift; 40 uint32_t size; 41 }; 42 43 /* 44 * 45 * Create the masks object 46 * 47 */ 48 static SkMasks* CreateMasks(InputMasks masks, uint32_t bpp); 49 50 /* 51 * 52 * Get a color component 53 * 54 */ 55 uint8_t getRed(uint32_t pixel) const; 56 uint8_t getGreen(uint32_t pixel) const; 57 uint8_t getBlue(uint32_t pixel) const; 58 uint8_t getAlpha(uint32_t pixel) const; 59 60 /* 61 * 62 * Getter for the alpha mask 63 * The alpha mask may be used in other decoding modes 64 * 65 */ 66 uint32_t getAlphaMask() const { 67 return fAlpha.mask; 68 } 69 70 private: 71 72 /* 73 * 74 * Constructor 75 * 76 */ 77 SkMasks(const MaskInfo& red, const MaskInfo& green, const MaskInfo& blue, 78 const MaskInfo& alpha); 79 80 const MaskInfo fRed; 81 const MaskInfo fGreen; 82 const MaskInfo fBlue; 83 const MaskInfo fAlpha; 84 }; 85 86 #endif 87
