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1 /* | |
2 * Copyright (C) 2008 The Android Open Source Project | |
3 * | |
4 * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 * you may not use this file except in compliance with the License. | |
6 * You may obtain a copy of the License at | |
7 * | |
8 * http://www.apache.org/licenses/LICENSE-2.0 | |
9 * | |
10 * Unless required by applicable law or agreed to in writing, software | |
11 * distributed under the License is distributed on an "AS IS" BASIS, | |
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 * See the License for the specific language governing permissions and | |
14 * limitations under the License. | |
15 */ | |
16 | |
17 #include "SkPageFlipper.h" | |
18 | |
19 SkPageFlipper::SkPageFlipper() { | |
20 fWidth = 0; | |
21 fHeight = 0; | |
22 fDirty0 = &fDirty0Storage; | |
23 fDirty1 = &fDirty1Storage; | |
24 | |
25 fDirty0->setEmpty(); | |
26 fDirty1->setEmpty(); | |
27 } | |
28 | |
29 SkPageFlipper::SkPageFlipper(int width, int height) { | |
30 fWidth = width; | |
31 fHeight = height; | |
32 fDirty0 = &fDirty0Storage; | |
33 fDirty1 = &fDirty1Storage; | |
34 | |
35 fDirty0->setRect(0, 0, width, height); | |
36 fDirty1->setEmpty(); | |
37 } | |
38 | |
39 void SkPageFlipper::resize(int width, int height) { | |
40 fWidth = width; | |
41 fHeight = height; | |
42 | |
43 // this is the opposite of the constructors | |
44 fDirty1->setRect(0, 0, width, height); | |
45 fDirty0->setEmpty(); | |
46 } | |
47 | |
48 void SkPageFlipper::inval() { | |
49 fDirty1->setRect(0, 0, fWidth, fHeight); | |
50 } | |
51 | |
52 void SkPageFlipper::inval(const SkIRect& rect) { | |
53 SkIRect r; | |
54 r.set(0, 0, fWidth, fHeight); | |
55 if (r.intersect(rect)) { | |
56 fDirty1->op(r, SkRegion::kUnion_Op); | |
57 } | |
58 } | |
59 | |
60 void SkPageFlipper::inval(const SkRegion& rgn) { | |
61 SkRegion r; | |
62 r.setRect(0, 0, fWidth, fHeight); | |
63 if (r.op(rgn, SkRegion::kIntersect_Op)) { | |
64 fDirty1->op(r, SkRegion::kUnion_Op); | |
65 } | |
66 } | |
67 | |
68 void SkPageFlipper::inval(const SkRect& rect, bool antialias) { | |
69 SkIRect r; | |
70 rect.round(&r); | |
71 if (antialias) { | |
72 r.inset(-1, -1); | |
73 } | |
74 this->inval(r); | |
75 } | |
76 | |
77 const SkRegion& SkPageFlipper::update(SkRegion* copyBits) { | |
78 // Copy over anything new from page0 that isn't dirty in page1 | |
79 copyBits->op(*fDirty0, *fDirty1, SkRegion::kDifference_Op); | |
80 SkTSwap<SkRegion*>(fDirty0, fDirty1); | |
81 fDirty1->setEmpty(); | |
82 return *fDirty0; | |
83 } | |
84 | |
85 | |
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