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1 /* libs/graphics/sgl/SkBlitter_A1.cpp | |
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 "SkCoreBlitters.h" | |
19 | |
20 SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint) | |
21 : INHERITED(device) | |
22 { | |
23 fSrcA = SkToU8(SkColorGetA(paint.getColor())); | |
24 } | |
25 | |
26 void SkA1_Blitter::blitH(int x, int y, int width) | |
27 { | |
28 SkASSERT(x >= 0 && y >= 0 && (unsigned)(x + width) <= (unsigned)fDevice.widt
h()); | |
29 | |
30 if (fSrcA <= 0x7F) | |
31 return; | |
32 | |
33 uint8_t* dst = fDevice.getAddr1(x, y); | |
34 int right = x + width; | |
35 | |
36 int left_mask = 0xFF >> (x & 7); | |
37 int rite_mask = 0xFF << (8 - (right & 7)); | |
38 int full_runs = (right >> 3) - ((x + 7) >> 3); | |
39 | |
40 // check for empty right mask, so we don't read off the end (or go slower th
an we need to) | |
41 if (rite_mask == 0) | |
42 { | |
43 SkASSERT(full_runs >= 0); | |
44 full_runs -= 1; | |
45 rite_mask = 0xFF; | |
46 } | |
47 if (left_mask == 0xFF) | |
48 full_runs -= 1; | |
49 | |
50 if (full_runs < 0) | |
51 { | |
52 SkASSERT((left_mask & rite_mask) != 0); | |
53 *dst |= (left_mask & rite_mask); | |
54 } | |
55 else | |
56 { | |
57 *dst++ |= left_mask; | |
58 memset(dst, 0xFF, full_runs); | |
59 dst += full_runs; | |
60 *dst |= rite_mask; | |
61 } | |
62 } | |
63 | |
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