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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 SkImage_Base_DEFINED
#define SkImage_Base_DEFINED
#include "SkAtomics.h"
#include "SkImage.h"
#include "SkSurface.h"
#include <new>
enum {
kNeedNewImageUniqueID = 0
};
class SkImage_Base : public SkImage {
public:
SkImage_Base(int width, int height, uint32_t uniqueID, const SkSurfaceProps* props);
virtual ~SkImage_Base();
/**
* If the props weren't know at constructor time, call this but only before the image is
* ever released into the wild (since the props field must appear to be immutable).
*/
void initWithProps(const SkSurfaceProps& props) {
SkASSERT(this->unique()); // only viewed by one thread
SkSurfaceProps* mutableProps = const_cast<SkSurfaceProps*>(&fProps);
SkASSERT(mutableProps != &props); // check for self-assignment
mutableProps->~SkSurfaceProps();
new (mutableProps) SkSurfaceProps(props);
}
const SkSurfaceProps& props() const { return fProps; }
virtual SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) const = 0;
virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const {
return nullptr;
}
// Default impl calls onDraw
virtual bool onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) const;
virtual GrTexture* peekTexture() const { return nullptr; }
// return a read-only copy of the pixels. We promise to not modify them,
// but only inspect them (or encode them).
virtual bool getROPixels(SkBitmap*) const = 0;
// Caller must call unref when they are done.
virtual GrTexture* asTextureRef(GrContext*, SkImageUsageType) const = 0;
virtual SkShader* onNewShader(SkShader::TileMode,
SkShader::TileMode,
const SkMatrix* localMatrix) const { return nullptr; }
// newWidth > 0, newHeight > 0, subset either nullptr or a proper subset of this bounds
virtual SkImage* onNewImage(int newWidth, int newHeight, const SkIRect* subset,
SkFilterQuality) const;
virtual SkData* onRefEncoded() const { return nullptr; }
virtual bool onAsLegacyBitmap(SkBitmap*, LegacyBitmapMode) const;
virtual bool onIsLazyGenerated() const { return false; }
// Call when this image is part of the key to a resourcecache entry. This allows the cache
// to know automatically those entries can be purged when this SkImage deleted.
void notifyAddedToCache() const {
fAddedToCache.store(true);
}
private:
const SkSurfaceProps fProps;
// Set true by caches when they cache content that's derived from the current pixels.
mutable SkAtomic<bool> fAddedToCache;
typedef SkImage INHERITED;
};
static inline SkImage_Base* as_IB(SkImage* image) {
return static_cast<SkImage_Base*>(image);
}
static inline const SkImage_Base* as_IB(const SkImage* image) {
return static_cast<const SkImage_Base*>(image);
}
#endif
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