1 2 /* 3 * Copyright 2008 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 "SkPageFlipper.h" 11 12 SkPageFlipper::SkPageFlipper() { 13 fWidth = 0; 14 fHeight = 0; 15 fDirty0 = &fDirty0Storage; 16 fDirty1 = &fDirty1Storage; 17 18 fDirty0->setEmpty(); 19 fDirty1->setEmpty(); 20 } 21 22 SkPageFlipper::SkPageFlipper(int width, int height) { 23 fWidth = width; 24 fHeight = height; 25 fDirty0 = &fDirty0Storage; 26 fDirty1 = &fDirty1Storage; 27 28 fDirty0->setRect(0, 0, width, height); 29 fDirty1->setEmpty(); 30 } 31 32 void SkPageFlipper::resize(int width, int height) { 33 fWidth = width; 34 fHeight = height; 35 36 // this is the opposite of the constructors 37 fDirty1->setRect(0, 0, width, height); 38 fDirty0->setEmpty(); 39 } 40 41 void SkPageFlipper::inval() { 42 fDirty1->setRect(0, 0, fWidth, fHeight); 43 } 44 45 void SkPageFlipper::inval(const SkIRect& rect) { 46 SkIRect r; 47 r.set(0, 0, fWidth, fHeight); 48 if (r.intersect(rect)) { 49 fDirty1->op(r, SkRegion::kUnion_Op); 50 } 51 } 52 53 void SkPageFlipper::inval(const SkRegion& rgn) { 54 SkRegion r; 55 r.setRect(0, 0, fWidth, fHeight); 56 if (r.op(rgn, SkRegion::kIntersect_Op)) { 57 fDirty1->op(r, SkRegion::kUnion_Op); 58 } 59 } 60 61 void SkPageFlipper::inval(const SkRect& rect, bool antialias) { 62 SkIRect r; 63 rect.round(&r); 64 if (antialias) { 65 r.inset(-1, -1); 66 } 67 this->inval(r); 68 } 69 70 const SkRegion& SkPageFlipper::update(SkRegion* copyBits) { 71 // Copy over anything new from page0 that isn't dirty in page1 72 copyBits->op(*fDirty0, *fDirty1, SkRegion::kDifference_Op); 73 SkTSwap<SkRegion*>(fDirty0, fDirty1); 74 fDirty1->setEmpty(); 75 return *fDirty0; 76 } 77
