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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 GrSurface_DEFINED
#define GrSurface_DEFINED
#include "GrTypes.h"
#include "GrResource.h"
class GrTexture;
class GrRenderTarget;
class GrSurface : public GrResource {
public:
SK_DECLARE_INST_COUNT(GrSurface);
/**
* Retrieves the width of the surface.
*
* @return the width in texels
*/
int width() const { return fDesc.fWidth; }
/**
* Retrieves the height of the surface.
*
* @return the height in texels
*/
int height() const { return fDesc.fHeight; }
/**
* Retrieves the pixel config specified when the surface was created.
* For render targets this can be kUnknown_GrPixelConfig
* if client asked us to render to a target that has a pixel
* config that isn't equivalent with one of our configs.
*/
GrPixelConfig config() const { return fDesc.fConfig; }
/**
* Return the descriptor describing the surface
*/
const GrTextureDesc& desc() const { return fDesc; }
/**
* @return the texture associated with the surface, may be NULL.
*/
virtual GrTexture* asTexture() = 0;
virtual const GrTexture* asTexture() const = 0;
/**
* @return the render target underlying this surface, may be NULL.
*/
virtual GrRenderTarget* asRenderTarget() = 0;
virtual const GrRenderTarget* asRenderTarget() const = 0;
/**
* Reads a rectangle of pixels from the surface.
* @param left left edge of the rectangle to read (inclusive)
* @param top top edge of the rectangle to read (inclusive)
* @param width width of rectangle to read in pixels.
* @param height height of rectangle to read in pixels.
* @param config the pixel config of the destination buffer
* @param buffer memory to read the rectangle into.
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*
* @return true if the read succeeded, false if not. The read can fail
* because of an unsupported pixel config.
*/
virtual bool readPixels(int left, int top, int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes) = 0;
/**
* Copy the src pixels [buffer, rowbytes, pixelconfig] into the surface
* at the specified rectangle.
* @param left left edge of the rectangle to write (inclusive)
* @param top top edge of the rectangle to write (inclusive)
* @param width width of rectangle to write in pixels.
* @param height height of rectangle to write in pixels.
* @param config the pixel config of the source buffer
* @param buffer memory to read the rectangle from.
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*/
virtual void writePixels(int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes) = 0;
protected:
GrTextureDesc fDesc;
GrSurface(GrGpu* gpu, const GrTextureDesc& desc)
: INHERITED(gpu)
, fDesc(desc) {
}
private:
typedef GrResource INHERITED;
};
#endif // GrSurface_DEFINED
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