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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 "SkImage.h"
#include "SkSurface.h"
static SkSurfaceProps copy_or_safe_defaults(const SkSurfaceProps* props) {
return props ? *props : SkSurfaceProps(0, kUnknown_SkPixelGeometry);
}
class SkImage_Base : public SkImage {
public:
SkImage_Base(int width, int height, const SkSurfaceProps* props)
: INHERITED(width, height)
, fProps(copy_or_safe_defaults(props))
{}
/**
* 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 NULL;
}
// Default impl calls onDraw
virtual bool onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY) const;
virtual GrTexture* onGetTexture() const { return NULL; }
// 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 { return false; }
virtual SkShader* onNewShader(SkShader::TileMode,
SkShader::TileMode,
const SkMatrix* localMatrix) const { return NULL; };
// newWidth > 0, newHeight > 0, subset either NULL or a proper subset of this bounds
virtual SkImage* onNewImage(int newWidth, int newHeight, const SkIRect* subset,
SkFilterQuality) const;
private:
const SkSurfaceProps fProps;
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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