1 /* 2 * Copyright 2006 The Android Open Source Project 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 9 #include "SkBitmap.h" 10 #include "SkMask.h" 11 12 #ifndef ClearLow3Bits_DEFINED 13 #define ClearLow3Bits_DEFINED 14 #define ClearLow3Bits(x) ((unsigned)(x) >> 3 << 3) 15 #endif 16 17 /* 18 SK_BLITBWMASK_NAME name of function(const SkBitmap& bitmap, const SkMask& mask, const SkIRect& clip, SK_BLITBWMASK_ARGS) 19 SK_BLITBWMASK_ARGS list of additional arguments to SK_BLITBWMASK_NAME, beginning with a comma 20 SK_BLITBWMASK_BLIT8 name of function(U8CPU byteMask, SK_BLITBWMASK_DEVTYPE* dst, int x, int y) 21 SK_BLITBWMASK_GETADDR either writable_addr[8,16,32] 22 SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8 23 */ 24 25 static void SK_BLITBWMASK_NAME(const SkPixmap& dst, const SkMask& srcMask, 26 const SkIRect& clip SK_BLITBWMASK_ARGS) { 27 SkASSERT(clip.fRight <= srcMask.fBounds.fRight); 28 29 int cx = clip.fLeft; 30 int cy = clip.fTop; 31 int maskLeft = srcMask.fBounds.fLeft; 32 unsigned mask_rowBytes = srcMask.fRowBytes; 33 size_t bitmap_rowBytes = dst.rowBytes(); 34 unsigned height = clip.height(); 35 36 SkASSERT(mask_rowBytes != 0); 37 SkASSERT(bitmap_rowBytes != 0); 38 SkASSERT(height != 0); 39 40 const uint8_t* bits = srcMask.getAddr1(cx, cy); 41 SK_BLITBWMASK_DEVTYPE* device = dst.SK_BLITBWMASK_GETADDR(cx, cy); 42 43 if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight) 44 { 45 do { 46 SK_BLITBWMASK_DEVTYPE* dst = device; 47 unsigned rb = mask_rowBytes; 48 do { 49 U8CPU mask = *bits++; 50 SK_BLITBWMASK_BLIT8(mask, dst); 51 dst += 8; 52 } while (--rb != 0); 53 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes); 54 } while (--height != 0); 55 } 56 else 57 { 58 int left_edge = cx - maskLeft; 59 SkASSERT(left_edge >= 0); 60 int rite_edge = clip.fRight - maskLeft; 61 SkASSERT(rite_edge > left_edge); 62 63 int left_mask = 0xFF >> (left_edge & 7); 64 int rite_mask = 0xFF << (8 - (rite_edge & 7)); 65 rite_mask &= 0xFF; // only want low-8 bits of mask 66 int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3); 67 68 // check for empty right mask, so we don't read off the end (or go slower than we need to) 69 if (rite_mask == 0) 70 { 71 SkASSERT(full_runs >= 0); 72 full_runs -= 1; 73 rite_mask = 0xFF; 74 } 75 if (left_mask == 0xFF) 76 full_runs -= 1; 77 78 // back up manually so we can keep in sync with our byte-aligned src 79 // and not trigger an assert from the getAddr## function 80 device -= left_edge & 7; 81 82 if (full_runs < 0) 83 { 84 left_mask &= rite_mask; 85 SkASSERT(left_mask != 0); 86 do { 87 U8CPU mask = *bits & left_mask; 88 SK_BLITBWMASK_BLIT8(mask, device); 89 bits += mask_rowBytes; 90 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes); 91 } while (--height != 0); 92 } 93 else 94 { 95 do { 96 int runs = full_runs; 97 SK_BLITBWMASK_DEVTYPE* dst = device; 98 const uint8_t* b = bits; 99 U8CPU mask; 100 101 mask = *b++ & left_mask; 102 SK_BLITBWMASK_BLIT8(mask, dst); 103 dst += 8; 104 105 while (--runs >= 0) 106 { 107 mask = *b++; 108 SK_BLITBWMASK_BLIT8(mask, dst); 109 dst += 8; 110 } 111 112 mask = *b & rite_mask; 113 SK_BLITBWMASK_BLIT8(mask, dst); 114 115 bits += mask_rowBytes; 116 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes); 117 } while (--height != 0); 118 } 119 } 120 } 121 122 #undef SK_BLITBWMASK_NAME 123 #undef SK_BLITBWMASK_ARGS 124 #undef SK_BLITBWMASK_BLIT8 125 #undef SK_BLITBWMASK_GETADDR 126 #undef SK_BLITBWMASK_DEVTYPE 127 #undef SK_BLITBWMASK_DOROWSETUP 128
