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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkGpuBlurUtils_DEFINED
#define SkGpuBlurUtils_DEFINED
#if SK_SUPPORT_GPU
#include "GrTextureProvider.h"
class GrTexture;
class GrContext;
#endif
struct SkRect;
namespace SkGpuBlurUtils {
#if SK_SUPPORT_GPU
/**
* Applies a 2D Gaussian blur to a given texture.
* @param context The GPU context
* @param srcTexture The source texture to be blurred.
* @param canClobberSrc If true, srcTexture may be overwritten, and
* may be returned as the result.
* @param dstBounds The destination bounds, relative to the source texture.
* @param srcBounds The source bounds, relative to the source texture. If non-null,
* no pixels will be sampled outside of this rectangle.
* @param sigmaX The blur's standard deviation in X.
* @param sigmaY The blur's standard deviation in Y.
* @return the blurred texture, which may be srcTexture reffed, or a
* new texture. It is the caller's responsibility to unref this texture.
*/
GrTexture* GaussianBlur(GrContext* context,
GrTexture* srcTexture,
bool canClobberSrc,
const SkRect& dstBounds,
const SkRect* srcBounds,
float sigmaX,
float sigmaY,
GrTextureProvider::SizeConstraint);
#endif
};
#endif
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