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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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