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