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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkDiscardablePixelRef_DEFINED
#define SkDiscardablePixelRef_DEFINED
#include "SkDiscardableMemory.h"
#include "SkImageGenerator.h"
#include "SkImageInfo.h"
#include "SkPixelRef.h"
/**
* A PixelRef backed by SkDiscardableMemory, with the ability to
* re-generate the pixels (via a SkImageGenerator) if the DM is
* purged.
*
* Since SkColorTable is reference-counted, we do not support indexed
* color with this class; there would be no way for the discardable
* memory system to unref the color table.
*/
class SkDiscardablePixelRef : public SkPixelRef {
public:
SK_DECLARE_INST_COUNT(SkDiscardablePixelRef)
SK_DECLARE_UNFLATTENABLE_OBJECT()
protected:
~SkDiscardablePixelRef();
virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE;
virtual void onUnlockPixels() SK_OVERRIDE;
virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; }
virtual SkData* onRefEncodedData() SK_OVERRIDE {
return fGenerator->refEncodedData();
}
private:
SkImageGenerator* const fGenerator;
SkDiscardableMemory::Factory* const fDMFactory;
const size_t fRowBytes;
// These const members should not change over the life of the
// PixelRef, since the SkBitmap doesn't expect them to change.
SkDiscardableMemory* fDiscardableMemory;
/* Takes ownership of SkImageGenerator. */
SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*,
size_t rowBytes,
SkDiscardableMemory::Factory* factory);
friend bool SkInstallDiscardablePixelRef(SkImageGenerator*,
SkBitmap*,
SkDiscardableMemory::Factory*);
typedef SkPixelRef INHERITED;
};
#endif // SkDiscardablePixelRef_DEFINED
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