1 /* libs/graphics/sgl/SkBlitBWMaskTemplate.h 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #include "SkBitmap.h" 19 #include "SkMask.h" 20 21 #ifndef ClearLow3Bits_DEFINED 22 #define ClearLow3Bits_DEFINED 23 #define ClearLow3Bits(x) ((unsigned)(x) >> 3 << 3) 24 #endif 25 26 /* 27 SK_BLITBWMASK_NAME name of function(const SkBitmap& bitmap, const SkMask& mask, const SkIRect& clip, SK_BLITBWMASK_ARGS) 28 SK_BLITBWMASK_ARGS list of additional arguments to SK_BLITBWMASK_NAME, beginning with a comma 29 SK_BLITBWMASK_BLIT8 name of function(U8CPU byteMask, SK_BLITBWMASK_DEVTYPE* dst, int x, int y) 30 SK_BLITBWMASK_GETADDR either getAddr32 or getAddr16 or getAddr8 31 SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8 32 */ 33 34 static void SK_BLITBWMASK_NAME(const SkBitmap& bitmap, const SkMask& srcMask, const SkIRect& clip SK_BLITBWMASK_ARGS) 35 { 36 SkASSERT(clip.fRight <= srcMask.fBounds.fRight); 37 38 int cx = clip.fLeft; 39 int cy = clip.fTop; 40 int maskLeft = srcMask.fBounds.fLeft; 41 unsigned mask_rowBytes = srcMask.fRowBytes; 42 unsigned bitmap_rowBytes = bitmap.rowBytes(); 43 unsigned height = clip.height(); 44 45 SkASSERT(mask_rowBytes != 0); 46 SkASSERT(bitmap_rowBytes != 0); 47 SkASSERT(height != 0); 48 49 const uint8_t* bits = srcMask.getAddr1(cx, cy); 50 SK_BLITBWMASK_DEVTYPE* device = bitmap.SK_BLITBWMASK_GETADDR(cx, cy); 51 52 if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight) 53 { 54 do { 55 SK_BLITBWMASK_DEVTYPE* dst = device; 56 unsigned rb = mask_rowBytes; 57 do { 58 U8CPU mask = *bits++; 59 SK_BLITBWMASK_BLIT8(mask, dst); 60 dst += 8; 61 } while (--rb != 0); 62 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes); 63 } while (--height != 0); 64 } 65 else 66 { 67 int left_edge = cx - maskLeft; 68 SkASSERT(left_edge >= 0); 69 int rite_edge = clip.fRight - maskLeft; 70 SkASSERT(rite_edge > left_edge); 71 72 int left_mask = 0xFF >> (left_edge & 7); 73 int rite_mask = 0xFF << (8 - (rite_edge & 7)); 74 int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3); 75 76 // check for empty right mask, so we don't read off the end (or go slower than we need to) 77 if (rite_mask == 0) 78 { 79 SkASSERT(full_runs >= 0); 80 full_runs -= 1; 81 rite_mask = 0xFF; 82 } 83 if (left_mask == 0xFF) 84 full_runs -= 1; 85 86 // back up manually so we can keep in sync with our byte-aligned src 87 // and not trigger an assert from the getAddr## function 88 device -= left_edge & 7; 89 // have cx reflect our actual starting x-coord 90 cx -= left_edge & 7; 91 92 if (full_runs < 0) 93 { 94 left_mask &= rite_mask; 95 SkASSERT(left_mask != 0); 96 do { 97 U8CPU mask = *bits & left_mask; 98 SK_BLITBWMASK_BLIT8(mask, device); 99 bits += mask_rowBytes; 100 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes); 101 } while (--height != 0); 102 } 103 else 104 { 105 do { 106 int runs = full_runs; 107 SK_BLITBWMASK_DEVTYPE* dst = device; 108 const uint8_t* b = bits; 109 U8CPU mask; 110 111 mask = *b++ & left_mask; 112 SK_BLITBWMASK_BLIT8(mask, dst); 113 dst += 8; 114 115 while (--runs >= 0) 116 { 117 mask = *b++; 118 SK_BLITBWMASK_BLIT8(mask, dst); 119 dst += 8; 120 } 121 122 mask = *b & rite_mask; 123 SK_BLITBWMASK_BLIT8(mask, dst); 124 125 bits += mask_rowBytes; 126 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes); 127 } while (--height != 0); 128 } 129 } 130 } 131 132 #undef SK_BLITBWMASK_NAME 133 #undef SK_BLITBWMASK_ARGS 134 #undef SK_BLITBWMASK_BLIT8 135 #undef SK_BLITBWMASK_GETADDR 136 #undef SK_BLITBWMASK_DEVTYPE 137 #undef SK_BLITBWMASK_DOROWSETUP 138
