1/* 2 * Copyright 2015 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 GrCircleBlurFragmentProcessor_DEFINED 9#define GrCircleBlurFragmentProcessor_DEFINED 10 11#include "SkString.h" 12#include "SkTypes.h" 13 14#if SK_SUPPORT_GPU 15 16#include "GrFragmentProcessor.h" 17#include "GrProcessorUnitTest.h" 18 19class GrTextureProvider; 20 21// This FP handles the special case of a blurred circle. It uses a 1D 22// profile that is just rotated about the origin of the circle. 23class GrCircleBlurFragmentProcessor : public GrFragmentProcessor { 24public: 25 ~GrCircleBlurFragmentProcessor() override {}; 26 27 const char* name() const override { return "CircleBlur"; } 28 29 SkString dumpInfo() const override { 30 SkString str; 31 str.appendf("Rect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], Sigma %.2f, Offset: %.2f", 32 fCircle.fLeft, fCircle.fTop, fCircle.fRight, fCircle.fBottom, 33 fSigma, fOffset); 34 return str; 35 } 36 37 static const GrFragmentProcessor* Create(GrTextureProvider*textureProvider, 38 const SkRect& circle, float sigma) { 39 float offset; 40 41 SkAutoTUnref<GrTexture> blurProfile(CreateCircleBlurProfileTexture(textureProvider, 42 circle, 43 sigma, 44 &offset)); 45 if (!blurProfile) { 46 return nullptr; 47 } 48 return new GrCircleBlurFragmentProcessor(circle, sigma, offset, blurProfile); 49 } 50 51 const SkRect& circle() const { return fCircle; } 52 float sigma() const { return fSigma; } 53 float offset() const { return fOffset; } 54 int profileSize() const { return fBlurProfileAccess.getTexture()->width(); } 55 56private: 57 GrCircleBlurFragmentProcessor(const SkRect& circle, float sigma, 58 float offset, GrTexture* blurProfile); 59 60 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 61 62 void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override; 63 64 bool onIsEqual(const GrFragmentProcessor& other) const override { 65 const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragmentProcessor>(); 66 // fOffset is computed from the circle width and the sigma 67 return this->circle().width() == cbfp.circle().width() && fSigma == cbfp.fSigma; 68 } 69 70 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 71 72 static GrTexture* CreateCircleBlurProfileTexture(GrTextureProvider*, 73 const SkRect& circle, 74 float sigma, float* offset); 75 76 SkRect fCircle; 77 float fSigma; 78 float fOffset; 79 GrTextureAccess fBlurProfileAccess; 80 81 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 82 83 typedef GrFragmentProcessor INHERITED; 84}; 85 86#endif 87#endif 88