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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrYUVProvider_DEFINED
#define GrYUVProvider_DEFINED
#include "GrTypes.h"
#include "SkImageInfo.h"
class GrContext;
class GrTexture;
/**
* There are at least 2 different ways to extract/retrieve YUV planar data...
* - SkPixelRef
* - SkImageGeneartor
*
* To share common functionality around using the planar data, we use this abstract base-class
* to represent accessing that data.
*/
class GrYUVProvider {
public:
virtual ~GrYUVProvider() {}
/**
* On success, this returns a texture that has converted the YUV data from the provider
* into a form that is supported by the GPU (typically transformed into RGB). If useCache
* is true, then the texture will automatically have a key added, so it can be retrieved
* from the cache (assuming it is requested by a provider w/ the same genID).
*
* On failure (e.g. the provider had no data), this returns NULL.
*/
GrTexture* refAsTexture(GrContext*, const GrSurfaceDesc&, bool useCache);
virtual uint32_t onGetID() = 0;
enum {
kY_Index = 0,
kU_Index = 1,
kV_Index = 2,
kPlaneCount = 3
};
// These are not meant to be called by a client, only by the implementation
/**
* Return the 3 dimensions for each plane and return true. On failure, return false and
* ignore the sizes parameter. Typical failure is that the provider does not contain YUV
* data, and may just be an RGB src.
*/
virtual bool onGetYUVSizes(SkISize sizes[kPlaneCount]) = 0;
/**
* On success, return true, and set sizes, rowbytes and colorspace to the appropriate values.
* planes[] will have already been allocated by the client (based on the worst-case sizes
* returned by onGetYUVSizes(). This method copies its planar data into those buffers.
*
* On failure, return false and ignore other parameters.
*/
virtual bool onGetYUVPlanes(SkISize sizes[kPlaneCount], void* planes[kPlaneCount],
size_t rowBytes[kPlaneCount], SkYUVColorSpace*) = 0;
};
#endif
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