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