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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"
#include "SkYUVSizeInfo.h"
class GrContext;
struct GrSurfaceDesc;
class GrTexture;
class GrTextureProxy;
/**
* There are at least 2 different ways to extract/retrieve YUV planar data...
* - SkPixelRef
* - SkImageGenerator
*
* 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 proxy that has converted the YUV data from the provider
* into a form that is supported by the GPU (typically transformed into RGB). 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). If srcColorSpace and dstColorSpace are
* specified, then a color conversion from src to dst will be applied to the pixels.
*
* On failure (e.g. the provider had no data), this returns NULL.
*/
sk_sp<GrTextureProxy> refAsTextureProxy(GrContext*, const GrSurfaceDesc&,
SkColorSpace* srcColorSpace,
SkColorSpace* dstColorSpace);
virtual uint32_t onGetID() = 0;
// These are not meant to be called by a client, only by the implementation
/**
* If decoding to YUV is supported, this returns true. Otherwise, this
* returns false and does not modify any of the parameters.
*
* @param sizeInfo Output parameter indicating the sizes and required
* allocation widths of the Y, U, and V planes.
* @param colorSpace Output parameter.
*/
virtual bool onQueryYUV8(SkYUVSizeInfo* sizeInfo, SkYUVColorSpace* colorSpace) const = 0;
/**
* Returns true on success and false on failure.
* This always attempts to perform a full decode. If the client only
* wants size, it should call onQueryYUV8().
*
* @param sizeInfo Needs to exactly match the values returned by the
* query, except the WidthBytes may be larger than the
* recommendation (but not smaller).
* @param planes Memory for each of the Y, U, and V planes.
*/
virtual bool onGetYUV8Planes(const SkYUVSizeInfo& sizeInfo, void* planes[3]) = 0;
private:
// This is used as release callback for the YUV data that we capture in an SkImage when
// uploading to a gpu. When the upload is complete and we release the SkImage this callback will
// release the underlying data.
static void YUVGen_DataReleaseProc(const void*, void* data);
};
#endif
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