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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 "SkPixelRef.h"
#include "SkImageGenerator.h"
#include "SkImageInfo.h"
/**
* An interface that allows a purgable PixelRef to re-decode an image.
*/
typedef SkDiscardableMemory* (*SkDiscardableMemoryFactory)(size_t bytes);
class SkDiscardablePixelRef : public SkPixelRef {
public:
/**
* Takes ownership of SkImageGenerator. If this method fails for
* whatever reason, it will return false and immediatetely delete
* the generator. If it succeeds, it will modify destination
* bitmap.
*
* If Install fails or when the SkDiscardablePixelRef that is
* installed into destination is destroyed, it will call
* SkDELETE() on the generator. Therefore, generator should be
* allocated with SkNEW() or SkNEW_ARGS().
*
* @param destination Upon success, this bitmap will be
* configured and have a pixelref installed.
*
* @param factory If not NULL, this object will be used as a
* source of discardable memory when decoding. If NULL, then
* SkDiscardableMemory::Create() will be called.
*
* @return true iff successful.
*/
static bool Install(SkImageGenerator* generator,
SkBitmap* destination,
SkDiscardableMemory::Factory* factory = NULL);
SK_DECLARE_UNFLATTENABLE_OBJECT()
protected:
~SkDiscardablePixelRef();
virtual void* onLockPixels(SkColorTable**) 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 SkImageInfo fInfo;
const size_t fSize; // size of memory to be allocated
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(SkImageGenerator* generator,
const SkImageInfo& info,
size_t size,
size_t rowBytes,
SkDiscardableMemory::Factory* factory);
};
#endif // SkDiscardablePixelRef_DEFINED
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