blob: 7849e8c651229d88b7a36920f371a47fc997cae9 [file] [log] [blame]
* 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
#include "GrRenderTargetContext.h"
class GrContext;
class GrTexture;
struct SkRect;
namespace SkGpuBlurUtils {
* Applies a 2D Gaussian blur to a given texture. The blurred result is returned
* as a renderTargetContext in case the caller wishes to future draw into the result.
* Note: one of sigmaX and sigmaY should be non-zero!
* @param context The GPU context
* @param srcTexture The source texture to be blurred.
* @param colorSpace Color space of the source (used for the renderTargetContext result,
* too).
* @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.
* @param fit backing fit for the returned render target context
* @return The renderTargetContext containing the blurred result.
sk_sp<GrRenderTargetContext> GaussianBlur(GrContext* context,
GrTexture* srcTexture,
sk_sp<SkColorSpace> colorSpace,
const SkIRect& dstBounds,
const SkIRect* srcBounds,
float sigmaX,
float sigmaY,
SkBackingFit fit = SkBackingFit::kApprox);