1 /* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkGpuBlurUtils_DEFINED 9 #define SkGpuBlurUtils_DEFINED 10 11 #if SK_SUPPORT_GPU 12 #include "GrRenderTargetContext.h" 13 #include "effects/GrTextureDomain.h" 14 15 class GrContext; 16 class GrTexture; 17 18 struct SkRect; 19 20 namespace SkGpuBlurUtils { 21 /** 22 * Applies a 2D Gaussian blur to a given texture. The blurred result is returned 23 * as a renderTargetContext in case the caller wishes to future draw into the result. 24 * Note: one of sigmaX and sigmaY should be non-zero! 25 * @param context The GPU context 26 * @param src The source to be blurred. 27 * @param colorSpace Color space of the source (used for the renderTargetContext result, 28 * too). 29 * @param dstBounds The destination bounds, relative to the source texture. 30 * @param srcBounds The source bounds, relative to the source texture. If non-null, 31 * no pixels will be sampled outside of this rectangle. 32 * @param sigmaX The blur's standard deviation in X. 33 * @param sigmaY The blur's standard deviation in Y. 34 * @param mode The mode to handle samples outside bounds. 35 * @param fit backing fit for the returned render target context 36 * @return The renderTargetContext containing the blurred result. 37 */ 38 sk_sp<GrRenderTargetContext> GaussianBlur( 39 GrContext* context, 40 sk_sp<GrTextureProxy> src, 41 sk_sp<SkColorSpace> colorSpace, 42 const SkIRect& dstBounds, 43 const SkIRect& srcBounds, 44 float sigmaX, 45 float sigmaY, 46 GrTextureDomain::Mode mode, 47 SkBackingFit fit = SkBackingFit::kApprox); 48 }; 49 50 #endif 51 #endif 52