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 new GrMatrixConvolutionEffect(texture, bounds, kernelSize, kernel, gain, bias, 31 kernelOffset, tileMode, convolveAlpha); 32 } 33 34 static GrFragmentProcessor* CreateGaussian(GrTexture* texture, 35 const SkIRect& bounds, 36 const SkISize& kernelSize, 37 SkScalar gain, 38 SkScalar bias, 39 const SkIPoint& kernelOffset, 40 GrTextureDomain::Mode tileMode, 41 bool convolveAlpha, 42 SkScalar sigmaX, 43 SkScalar sigmaY); 44 45 const SkIRect& bounds() const { return fBounds; } 46 const SkISize& kernelSize() const { return fKernelSize; } 47 const float* kernelOffset() const { return fKernelOffset; } 48 const float* kernel() const { return fKernel; } 49 float gain() const { return fGain; } 50 float bias() const { return fBias; } 51 bool convolveAlpha() const { return fConvolveAlpha; } 52 const GrTextureDomain& domain() const { return fDomain; } 53 54 const char* name() const override { return "MatrixConvolution"; } 55 56 private: 57 GrMatrixConvolutionEffect(GrTexture*, 58 const SkIRect& bounds, 59 const SkISize& kernelSize, 60 const SkScalar* kernel, 61 SkScalar gain, 62 SkScalar bias, 63 const SkIPoint& kernelOffset, 64 GrTextureDomain::Mode tileMode, 65 bool convolveAlpha); 66 67 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 68 69 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 70 71 bool onIsEqual(const GrFragmentProcessor&) const override; 72 73 void onComputeInvariantOutput(GrInvariantOutput* inout) const override { 74 // TODO: Try to do better? 75 inout->mulByUnknownFourComponents(); 76 } 77 78 SkIRect fBounds; 79 SkISize fKernelSize; 80 float fKernel[MAX_KERNEL_SIZE]; 81 float fGain; 82 float fBias; 83 float fKernelOffset[2]; 84 bool fConvolveAlpha; 85 GrTextureDomain fDomain; 86 87 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 88 89 typedef GrSingleTextureEffect INHERITED; 90 }; 91 92 #endif 93
