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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLazyPixelRef_DEFINED
#define SkLazyPixelRef_DEFINED
#include "SkBitmapFactory.h"
#include "SkImage.h"
#include "SkPixelRef.h"
#include "SkFlattenable.h"
class SkColorTable;
class SkData;
class SkImageCache;
#ifdef SK_DEBUG
#define LAZY_CACHE_STATS 1
#elif !defined(LAZY_CACHE_STATS)
#define LAZY_CACHE_STATS 0
#endif
/**
* PixelRef which defers decoding until SkBitmap::lockPixels() is called.
*/
class SkLazyPixelRef : public SkPixelRef {
public:
/**
* Create a new SkLazyPixelRef.
* @param SkData Encoded data representing the pixels.
* @param DecodeProc Called to decode the pixels when needed. Must be non-NULL.
* @param SkImageCache Object that handles allocating and freeing the pixel memory, as needed.
* Must not be NULL.
*/
SkLazyPixelRef(SkData*, SkBitmapFactory::DecodeProc, SkImageCache*);
virtual ~SkLazyPixelRef();
#ifdef SK_DEBUG
intptr_t getCacheId() const { return fCacheId; }
#endif
#if LAZY_CACHE_STATS
static int32_t GetCacheHits() { return gCacheHits; }
static int32_t GetCacheMisses() { return gCacheMisses; }
static void ResetCacheStats() { gCacheHits = gCacheMisses = 0; }
#endif
// No need to flatten this object. When flattening an SkBitmap, SkOrderedWriteBuffer will check
// the encoded data and write that instead.
// Future implementations of SkFlattenableWriteBuffer will need to special case for
// onRefEncodedData as well.
SK_DECLARE_UNFLATTENABLE_OBJECT()
protected:
virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE;
virtual void onUnlockPixels() SK_OVERRIDE;
virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; }
virtual SkData* onRefEncodedData() SK_OVERRIDE;
virtual bool onImplementsDecodeInto() SK_OVERRIDE;
virtual bool onDecodeInto(int pow2, SkBitmap*) SK_OVERRIDE;
private:
bool fErrorInDecoding;
SkData* fData;
SkBitmapFactory::DecodeProc fDecodeProc;
SkImageCache* fImageCache;
intptr_t fCacheId;
size_t fRowBytes;
#if LAZY_CACHE_STATS
static int32_t gCacheHits;
static int32_t gCacheMisses;
#endif
typedef SkPixelRef INHERITED;
};
#endif // SkLazyPixelRef_DEFINED
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