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 19 class GrResourceProvider; 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. 23 class GrCircleBlurFragmentProcessor : public GrFragmentProcessor { 24 public: ~GrCircleBlurFragmentProcessor()25 ~GrCircleBlurFragmentProcessor() override {} 26 name()27 const char* name() const override { return "CircleBlur"; } 28 dumpInfo()29 SkString dumpInfo() const override { 30 SkString str; 31 str.appendf("Rect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], solidR: %.2f, textureR: %.2f", 32 fCircle.fLeft, fCircle.fTop, fCircle.fRight, fCircle.fBottom, 33 fSolidRadius, fTextureRadius); 34 return str; 35 } 36 37 static sk_sp<GrFragmentProcessor> Make(GrResourceProvider*, const SkRect& circle, float sigma); 38 39 private: 40 // This nested GLSL processor implementation is defined in the cpp file. 41 class GLSLProcessor; 42 43 /** 44 * Creates a profile texture for the circle and sigma. The texture will have a height of 1. 45 * The x texture coord should map from 0 to 1 across the radius range of solidRadius to 46 * solidRadius + textureRadius. 47 */ 48 GrCircleBlurFragmentProcessor(GrResourceProvider*, const SkRect& circle, 49 float textureRadius, float innerRadius, 50 sk_sp<GrTextureProxy> blurProfile); 51 52 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 53 54 void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override; 55 onIsEqual(const GrFragmentProcessor & other)56 bool onIsEqual(const GrFragmentProcessor& other) const override { 57 const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragmentProcessor>(); 58 return fCircle == cbfp.fCircle && fSolidRadius == cbfp.fSolidRadius && 59 fTextureRadius == cbfp.fTextureRadius; 60 } 61 62 SkRect fCircle; 63 SkScalar fSolidRadius; 64 float fTextureRadius; 65 TextureSampler fBlurProfileSampler; 66 67 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 68 69 typedef GrFragmentProcessor INHERITED; 70 }; 71 72 #endif 73 #endif 74