reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 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 |