1 /* 2 * Copyright 2014 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 GrMatrixConvolutionEffect_DEFINED 9 #define GrMatrixConvolutionEffect_DEFINED 10 11 #include "GrSingleTextureEffect.h" 12 #include "GrInvariantOutput.h" 13 #include "GrTextureDomain.h" 14 15 // A little bit less than the minimum # uniforms required by DX9SM2 (32). 16 // Allows for a 5x5 kernel (or 25x1, for that matter). 17 #define MAX_KERNEL_SIZE 25 18 19 class GrMatrixConvolutionEffect : public GrSingleTextureEffect { 20 public: 21 static GrFragmentProcessor* Create(GrTexture* texture, 22 const SkIRect& bounds, 23 const SkISize& kernelSize, 24 const SkScalar* kernel, 25 SkScalar gain, 26 SkScalar bias, 27 const SkIPoint& kernelOffset, 28 GrTextureDomain::Mode tileMode, 29 bool convolveAlpha) { 30 return SkNEW_ARGS(GrMatrixConvolutionEffect, (texture, 31 bounds, 32 kernelSize, 33 kernel, 34 gain, 35 bias, 36 kernelOffset, 37 tileMode, 38 convolveAlpha)); 39 } 40 41 static GrFragmentProcessor* CreateGaussian(GrTexture* texture, 42 const SkIRect& bounds, 43 const SkISize& kernelSize, 44 SkScalar gain, 45 SkScalar bias, 46 const SkIPoint& kernelOffset, 47 GrTextureDomain::Mode tileMode, 48 bool convolveAlpha, 49 SkScalar sigmaX, 50 SkScalar sigmaY); 51 52 virtual ~GrMatrixConvolutionEffect(); 53 54 const SkIRect& bounds() const { return fBounds; } 55 const SkISize& kernelSize() const { return fKernelSize; } 56 const float* kernelOffset() const { return fKernelOffset; } 57 const float* kernel() const { return fKernel; } 58 float gain() const { return fGain; } 59 float bias() const { return fBias; } 60 bool convolveAlpha() const { return fConvolveAlpha; } 61 const GrTextureDomain& domain() const { return fDomain; } 62 63 const char* name() const override { return "MatrixConvolution"; } 64 65 void getGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 66 67 GrGLFragmentProcessor* createGLInstance() const override; 68 69 private: 70 GrMatrixConvolutionEffect(GrTexture*, 71 const SkIRect& bounds, 72 const SkISize& kernelSize, 73 const SkScalar* kernel, 74 SkScalar gain, 75 SkScalar bias, 76 const SkIPoint& kernelOffset, 77 GrTextureDomain::Mode tileMode, 78 bool convolveAlpha); 79 80 bool onIsEqual(const GrFragmentProcessor&) const override; 81 82 void onComputeInvariantOutput(GrInvariantOutput* inout) const override { 83 // TODO: Try to do better? 84 inout->mulByUnknownFourComponents(); 85 } 86 87 SkIRect fBounds; 88 SkISize fKernelSize; 89 float fKernel[MAX_KERNEL_SIZE]; 90 float fGain; 91 float fBias; 92 float fKernelOffset[2]; 93 bool fConvolveAlpha; 94 GrTextureDomain fDomain; 95 96 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 97 98 typedef GrSingleTextureEffect INHERITED; 99 }; 100 101 #endif 102
