michael@0: 
michael@0: /*
michael@0:  * Copyright 2008 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "SkPageFlipper.h"
michael@0: 
michael@0: SkPageFlipper::SkPageFlipper() {
michael@0:     fWidth = 0;
michael@0:     fHeight = 0;
michael@0:     fDirty0 = &fDirty0Storage;
michael@0:     fDirty1 = &fDirty1Storage;
michael@0: 
michael@0:     fDirty0->setEmpty();
michael@0:     fDirty1->setEmpty();
michael@0: }
michael@0: 
michael@0: SkPageFlipper::SkPageFlipper(int width, int height) {
michael@0:     fWidth = width;
michael@0:     fHeight = height;
michael@0:     fDirty0 = &fDirty0Storage;
michael@0:     fDirty1 = &fDirty1Storage;
michael@0: 
michael@0:     fDirty0->setRect(0, 0, width, height);
michael@0:     fDirty1->setEmpty();
michael@0: }
michael@0: 
michael@0: void SkPageFlipper::resize(int width, int height) {
michael@0:     fWidth = width;
michael@0:     fHeight = height;
michael@0: 
michael@0:     // this is the opposite of the constructors
michael@0:     fDirty1->setRect(0, 0, width, height);
michael@0:     fDirty0->setEmpty();
michael@0: }
michael@0: 
michael@0: void SkPageFlipper::inval() {
michael@0:     fDirty1->setRect(0, 0, fWidth, fHeight);
michael@0: }
michael@0: 
michael@0: void SkPageFlipper::inval(const SkIRect& rect) {
michael@0:     SkIRect r;
michael@0:     r.set(0, 0, fWidth, fHeight);
michael@0:     if (r.intersect(rect)) {
michael@0:         fDirty1->op(r, SkRegion::kUnion_Op);
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkPageFlipper::inval(const SkRegion& rgn) {
michael@0:     SkRegion r;
michael@0:     r.setRect(0, 0, fWidth, fHeight);
michael@0:     if (r.op(rgn, SkRegion::kIntersect_Op)) {
michael@0:         fDirty1->op(r, SkRegion::kUnion_Op);
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkPageFlipper::inval(const SkRect& rect, bool antialias) {
michael@0:     SkIRect r;
michael@0:     rect.round(&r);
michael@0:     if (antialias) {
michael@0:         r.inset(-1, -1);
michael@0:     }
michael@0:     this->inval(r);
michael@0: }
michael@0: 
michael@0: const SkRegion& SkPageFlipper::update(SkRegion* copyBits) {
michael@0:     // Copy over anything new from page0 that isn't dirty in page1
michael@0:     copyBits->op(*fDirty0, *fDirty1, SkRegion::kDifference_Op);
michael@0:     SkTSwap<SkRegion*>(fDirty0, fDirty1);
michael@0:     fDirty1->setEmpty();
michael@0:     return *fDirty0;
michael@0: }