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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"
#if SK_SUPPORT_GPU
#include "GrTextureProxy.h"
class GrTexture;
#endif
#include <new>
class GrSamplerState;
class SkImageCacherator;
enum {
kNeedNewImageUniqueID = 0
};
class SkImage_Base : public SkImage {
public:
virtual ~SkImage_Base();
// User: returns image info for this SkImage.
// Implementors: if you can not return the value, return an invalid ImageInfo with w=0 & h=0
// & unknown color space.
virtual SkImageInfo onImageInfo() const = 0;
virtual SkColorType onColorType() const = 0;
virtual SkAlphaType onAlphaType() const = 0;
virtual SkIRect onGetSubset() const {
return { 0, 0, this->width(), this->height() };
}
virtual bool onPeekPixels(SkPixmap*) const { return false; }
virtual const SkBitmap* onPeekBitmap() const { return nullptr; }
virtual bool onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY, CachingHint) const = 0;
virtual GrContext* context() const { return nullptr; }
#if SK_SUPPORT_GPU
virtual GrTextureProxy* peekProxy() const { return nullptr; }
virtual sk_sp<GrTextureProxy> asTextureProxyRef() const { return nullptr; }
virtual sk_sp<GrTextureProxy> asTextureProxyRef(GrContext*, const GrSamplerState&,
SkColorSpace*, sk_sp<SkColorSpace>*,
SkScalar scaleAdjust[2]) const = 0;
virtual sk_sp<GrTextureProxy> refPinnedTextureProxy(uint32_t* uniqueID) const {
return nullptr;
}
virtual GrTexture* onGetTexture() const { return nullptr; }
#endif
virtual GrBackendTexture onGetBackendTexture(bool flushPendingGrContextIO,
GrSurfaceOrigin* origin) const;
virtual SkImageCacherator* peekCacherator() 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*, SkColorSpace* dstColorSpace,
CachingHint = kAllow_CachingHint) const = 0;
virtual sk_sp<SkImage> onMakeSubset(const SkIRect&) const = 0;
virtual sk_sp<SkData> onRefEncoded() const { return nullptr; }
virtual bool onAsLegacyBitmap(SkBitmap*) const;
// True for picture-backed and codec-backed
virtual bool onIsLazyGenerated() const { return false; }
// True only for generators that operate directly on gpu (e.g. picture-generators)
virtual bool onCanLazyGenerateOnGPU() 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);
}
virtual bool onIsValid(GrContext*) const = 0;
virtual bool onPinAsTexture(GrContext*) const { return false; }
virtual void onUnpinAsTexture(GrContext*) const {}
virtual sk_sp<SkImage> onMakeColorSpace(sk_sp<SkColorSpace>, SkColorType,
SkTransferFunctionBehavior) const = 0;
protected:
SkImage_Base(int width, int height, uint32_t uniqueID);
private:
// 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 SkImage_Base* as_IB(const sk_sp<SkImage>& image) {
return static_cast<SkImage_Base*>(image.get());
}
static inline const SkImage_Base* as_IB(const SkImage* image) {
return static_cast<const SkImage_Base*>(image);
}
#endif
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