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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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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