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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 SkSurface_Base_DEFINED
#define SkSurface_Base_DEFINED
#include "SkSurface.h"
class SkSurface_Base : public SkSurface {
public:
SkSurface_Base(int width, int height);
virtual ~SkSurface_Base();
/**
* Allocate a canvas that will draw into this surface. We will cache this
* canvas, to return the same object to the caller multiple times. We
* take ownership, and will call unref() on the canvas when we go out of
* scope.
*/
virtual SkCanvas* onNewCanvas() = 0;
virtual SkSurface* onNewSurface(const SkImage::Info&, SkColorSpace*) = 0;
/**
* Allocate an SkImage that represents the current contents of the surface.
* This needs to be able to outlive the surface itself (if need be), and
* must faithfully represent the current contents, even if the surface
* is chaged after this calle (e.g. it is drawn to via its canvas).
*/
virtual SkImage* onNewImageShapshot() = 0;
/**
* Default implementation:
*
* image = this->newImageSnapshot();
* if (image) {
* image->draw(canvas, ...);
* image->unref();
* }
*/
virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*);
/**
* Returns a the result of onNewCanvas(), but caches it so that only one
* canvas never ever be created.
*/
SkCanvas* getCachedCanvas() {
if (NULL == fCachedCanvas) {
fCachedCanvas = this->onNewCanvas();
}
return fCachedCanvas;
}
private:
SkCanvas* fCachedCanvas;
typedef SkSurface INHERITED;
};
#endif
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