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1 | |
2 /* | |
3 * Copyright 2006 The Android Open Source Project | |
4 * | |
5 * Use of this source code is governed by a BSD-style license that can be | |
6 * found in the LICENSE file. | |
7 */ | |
8 | |
9 | |
10 #include "SkCoreBlitters.h" | |
11 | |
12 SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint) | |
13 : INHERITED(device) { | |
14 fSrcA = paint.getAlpha(); | |
15 } | |
16 | |
17 void SkA1_Blitter::blitH(int x, int y, int width) { | |
18 SkASSERT(x >= 0 && y >= 0 && | |
19 (unsigned)(x + width) <= (unsigned)fDevice.width()); | |
20 | |
21 if (fSrcA <= 0x7F) { | |
22 return; | |
23 } | |
24 uint8_t* dst = fDevice.getAddr1(x, y); | |
25 int right = x + width; | |
26 | |
27 int left_mask = 0xFF >> (x & 7); | |
28 int rite_mask = 0xFF << (8 - (right & 7)); | |
29 int full_runs = (right >> 3) - ((x + 7) >> 3); | |
30 | |
31 // check for empty right mask, so we don't read off the end | |
32 // (or go slower than we need to) | |
33 if (rite_mask == 0) { | |
34 SkASSERT(full_runs >= 0); | |
35 full_runs -= 1; | |
36 rite_mask = 0xFF; | |
37 } | |
38 if (left_mask == 0xFF) { | |
39 full_runs -= 1; | |
40 } | |
41 if (full_runs < 0) { | |
42 SkASSERT((left_mask & rite_mask) != 0); | |
43 *dst |= (left_mask & rite_mask); | |
44 } else { | |
45 *dst++ |= left_mask; | |
46 memset(dst, 0xFF, full_runs); | |
47 dst += full_runs; | |
48 *dst |= rite_mask; | |
49 } | |
50 } | |
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