1 /* 2 * Copyright 2011 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 8 #ifndef SkBlitRow_DEFINED 9 #define SkBlitRow_DEFINED 10 11 #include "SkBitmap.h" 12 #include "SkColor.h" 13 14 class SkBlitRow { 15 public: 16 enum Flags16 { 17 //! If set, the alpha parameter will be != 255 18 kGlobalAlpha_Flag = 0x01, 19 //! If set, the src colors may have alpha != 255 20 kSrcPixelAlpha_Flag = 0x02, 21 //! If set, the resulting 16bit colors should be dithered 22 kDither_Flag = 0x04 23 }; 24 25 /** Function pointer that reads a scanline of src SkPMColors, and writes 26 a corresponding scanline of 16bit colors (specific format based on the 27 config passed to the Factory. 28 29 The x,y params provide the dithering phase for the start of the scanline 30 31 @param alpha A global alpha to be applied to all of the src colors 32 @param x The x coordinate of the beginning of the scanline 33 @param y THe y coordinate of the scanline 34 */ 35 typedef void (*Proc16)(uint16_t dst[], const SkPMColor src[], int count, 36 U8CPU alpha, int x, int y); 37 38 static Proc16 Factory16(unsigned flags); 39 40 /** 41 * Function pointer that blends a single src color onto a scaline of dst colors. 42 * 43 * The x,y params provide the dithering phase for the start of the scanline 44 */ 45 typedef void (*ColorProc16)(uint16_t dst[], SkPMColor src, int count, int x, int y); 46 47 // Note : we ignore the kGlobalAlpha_Flag setting, but do respect kSrcPixelAlpha_Flag 48 static ColorProc16 ColorFactory16(unsigned flags); 49 50 ///////////// D32 version 51 52 enum Flags32 { 53 kGlobalAlpha_Flag32 = 1 << 0, 54 kSrcPixelAlpha_Flag32 = 1 << 1 55 }; 56 57 /** Function pointer that blends 32bit colors onto a 32bit destination. 58 @param dst array of dst 32bit colors 59 @param src array of src 32bit colors (w/ or w/o alpha) 60 @param count number of colors to blend 61 @param alpha global alpha to be applied to all src colors 62 */ 63 typedef void (*Proc32)(uint32_t dst[], const SkPMColor src[], int count, U8CPU alpha); 64 65 static Proc32 Factory32(unsigned flags32); 66 67 /** Blend a single color onto a row of S32 pixels, writing the result 68 into a row of D32 pixels. src and dst may be the same memory, but 69 if they are not, they may not overlap. 70 */ 71 static void Color32(SkPMColor dst[], const SkPMColor src[], int count, SkPMColor color); 72 73 /** These static functions are called by the Factory and Factory32 74 functions, and should return either NULL, or a 75 platform-specific function-ptr to be used in place of the 76 system default. 77 */ 78 79 static Proc32 PlatformProcs32(unsigned flags); 80 81 static Proc16 PlatformFactory565(unsigned flags); 82 static ColorProc16 PlatformColorFactory565(unsigned flags); 83 84 private: 85 enum { 86 kFlags16_Mask = 7, 87 kFlags32_Mask = 3 88 }; 89 }; 90 91 #endif 92
