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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.
*/
#ifndef SkFlipPixelRef_DEFINED
#define SkFlipPixelRef_DEFINED
#include "SkBitmap.h"
#include "SkPageFlipper.h"
#include "SkPixelRef.h"
#include "SkThread.h"
class SkRegion;
class SkFlipPixelRef : public SkPixelRef {
public:
SkFlipPixelRef(SkBitmap::Config, int width, int height);
virtual ~SkFlipPixelRef();
bool isDirty() const { return fFlipper.isDirty(); }
const SkRegion& dirtyRgn() const { return fFlipper.dirtyRgn(); }
void inval() { fFlipper.inval(); }
void inval(const SkIRect& rect) { fFlipper.inval(rect); }
void inval(const SkRegion& rgn) { fFlipper.inval(rgn); }
void inval(const SkRect& r, bool doAA) { fFlipper.inval(r, doAA); }
const SkRegion& beginUpdate(SkBitmap* device);
void endUpdate();
private:
void getFrontBack(const void** front, void** back) const {
if (front) {
*front = fPage0;
}
if (back) {
*back = fPage1;
}
}
void swapPages();
// Helper to copy pixels from srcAddr to the dst bitmap, clipped to clip.
// srcAddr points to memory with the same config as dst.
static void CopyBitsFromAddr(const SkBitmap& dst, const SkRegion& clip,
const void* srcAddr);
// serialization
public:
virtual Factory getFactory() const { return Create; }
virtual void flatten(SkFlattenableWriteBuffer&) const;
static SkPixelRef* Create(SkFlattenableReadBuffer& buffer);
protected:
virtual void* onLockPixels(SkColorTable**);
virtual void onUnlockPixels();
SkFlipPixelRef(SkFlattenableReadBuffer&);
private:
SkMutex fMutex;
SkPageFlipper fFlipper;
void* fStorage;
void* fPage0; // points into fStorage;
void* fPage1; // points into fStorage;
size_t fSize; // size of 1 page. fStorage holds 2 pages
SkBitmap::Config fConfig;
typedef SkPixelRef INHERITED;
};
class SkAutoFlipUpdate : SkNoncopyable {
public:
SkAutoFlipUpdate(SkFlipPixelRef* ref) : fRef(ref) {
fDirty = &ref->beginUpdate(&fBitmap);
}
~SkAutoFlipUpdate() {
if (fRef) {
fRef->endUpdate();
}
}
const SkBitmap& bitmap() const { return fBitmap; }
const SkRegion& dirty() const { return *fDirty; }
// optional. This gets automatically called in the destructor (only once)
void endUpdate() {
if (fRef) {
fRef->endUpdate();
fRef = NULL;
}
}
private:
SkFlipPixelRef* fRef;
SkBitmap fBitmap;
const SkRegion* fDirty;
};
#endif
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