1 #ifndef SkBlitRow_DEFINED 2 #define SkBlitRow_DEFINED 3 4 #include "SkBitmap.h" 5 #include "SkColor.h" 6 7 class SkBlitRow { 8 public: 9 enum Flags16 { 10 //! If set, the alpha parameter will be != 255 11 kGlobalAlpha_Flag = 0x01, 12 //! If set, the src colors may have alpha != 255 13 kSrcPixelAlpha_Flag = 0x02, 14 //! If set, the resulting 16bit colors should be dithered 15 kDither_Flag = 0x04 16 }; 17 18 /** Function pointer that reads a scanline of src SkPMColors, and writes 19 a corresponding scanline of 16bit colors (specific format based on the 20 config passed to the Factory. 21 22 The x,y params are useful just for dithering 23 24 @param alpha A global alpha to be applied to all of the src colors 25 @param x The x coordinate of the beginning of the scanline 26 @param y THe y coordinate of the scanline 27 */ 28 typedef void (*Proc)(uint16_t* SK_RESTRICT dst, 29 const SkPMColor* SK_RESTRICT src, 30 int count, U8CPU alpha, int x, int y); 31 32 //! Public entry-point to return a blit function ptr 33 static Proc Factory(unsigned flags, SkBitmap::Config); 34 35 ///////////// D32 version 36 37 enum Flags32 { 38 kGlobalAlpha_Flag32 = 1 << 0, 39 kSrcPixelAlpha_Flag32 = 1 << 1, 40 }; 41 42 /** Function pointer that blends 32bit colors onto a 32bit destination. 43 @param dst array of dst 32bit colors 44 @param src array of src 32bit colors (w/ or w/o alpha) 45 @param count number of colors to blend 46 @param alpha global alpha to be applied to all src colors 47 */ 48 typedef void (*Proc32)(uint32_t* SK_RESTRICT dst, 49 const SkPMColor* SK_RESTRICT src, 50 int count, U8CPU alpha); 51 52 static Proc32 Factory32(unsigned flags32); 53 54 /** Blend a single color onto a row of S32 pixels, writing the result 55 into a row of D32 pixels. src and dst may be the same memory, but 56 if they are not, they may not overlap. 57 */ 58 static void Color32(SkPMColor dst[], const SkPMColor src[], int count, 59 SkPMColor color); 60 61 /** Blend a single color onto a row of 32bit pixels, writing the result 62 into the same row. 63 */ 64 static void Color32(SkPMColor row[], int count, SkPMColor color) { 65 Color32(row, row, count, color); 66 } 67 68 /** These static functions are called by the Factory and Factory32 69 functions, and should return either NULL, or a 70 platform-specific function-ptr to be used in place of the 71 system default. 72 */ 73 74 static Proc32 PlatformProcs32(unsigned flags); 75 static Proc PlatformProcs565(unsigned flags); 76 static Proc PlatformProcs4444(unsigned flags); 77 78 private: 79 enum { 80 kFlags16_Mask = 7, 81 kFlags32_Mask = 3 82 }; 83 }; 84 85 #endif 86
