The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/gpu/effects/GrConvolutionEffect.h
gfx/skia/trunk/src/gpu/effects/GrConvolutionEffect.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:4fc1899bac11 |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 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 GrConvolutionEffect_DEFINED | |
| 9 #define GrConvolutionEffect_DEFINED | |
| 10 | |
| 11 #include "Gr1DKernelEffect.h" | |
| 12 | |
| 13 class GrGLConvolutionEffect; | |
| 14 | |
| 15 /** | |
| 16 * A convolution effect. The kernel is specified as an array of 2 * half-width | |
| 17 * + 1 weights. Each texel is multiplied by it's weight and summed to determine | |
| 18 * the output color. The output color is modulated by the input color. | |
| 19 */ | |
| 20 class GrConvolutionEffect : public Gr1DKernelEffect { | |
| 21 | |
| 22 public: | |
| 23 | |
| 24 /// Convolve with an arbitrary user-specified kernel | |
| 25 static GrEffectRef* Create(GrTexture* tex, | |
| 26 Direction dir, | |
| 27 int halfWidth, | |
| 28 const float* kernel, | |
| 29 bool useBounds, | |
| 30 float bounds[2]) { | |
| 31 AutoEffectUnref effect(SkNEW_ARGS(GrConvolutionEffect, (tex, | |
| 32 dir, | |
| 33 halfWidth, | |
| 34 kernel, | |
| 35 useBounds, | |
| 36 bounds))); | |
| 37 return CreateEffectRef(effect); | |
| 38 } | |
| 39 | |
| 40 /// Convolve with a Gaussian kernel | |
| 41 static GrEffectRef* CreateGaussian(GrTexture* tex, | |
| 42 Direction dir, | |
| 43 int halfWidth, | |
| 44 float gaussianSigma, | |
| 45 bool useBounds, | |
| 46 float bounds[2]) { | |
| 47 AutoEffectUnref effect(SkNEW_ARGS(GrConvolutionEffect, (tex, | |
| 48 dir, | |
| 49 halfWidth, | |
| 50 gaussianSigma, | |
| 51 useBounds, | |
| 52 bounds))); | |
| 53 return CreateEffectRef(effect); | |
| 54 } | |
| 55 | |
| 56 virtual ~GrConvolutionEffect(); | |
| 57 | |
| 58 const float* kernel() const { return fKernel; } | |
| 59 | |
| 60 const float* bounds() const { return fBounds; } | |
| 61 bool useBounds() const { return fUseBounds; } | |
| 62 | |
| 63 static const char* Name() { return "Convolution"; } | |
| 64 | |
| 65 typedef GrGLConvolutionEffect GLEffect; | |
| 66 | |
| 67 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; | |
| 68 | |
| 69 virtual void getConstantColorComponents(GrColor*, uint32_t* validFlags) const { | |
| 70 // If the texture was opaque we could know that the output color if we knew the sum of the | |
| 71 // kernel values. | |
| 72 *validFlags = 0; | |
| 73 } | |
| 74 | |
| 75 enum { | |
| 76 // This was decided based on the min allowed value for the max texture | |
| 77 // samples per fragment program run in DX9SM2 (32). A sigma param of 4.0 | |
| 78 // on a blur filter gives a kernel width of 25 while a sigma of 5.0 | |
| 79 // would exceed a 32 wide kernel. | |
| 80 kMaxKernelRadius = 12, | |
| 81 // With a C++11 we could have a constexpr version of WidthFromRadius() | |
| 82 // and not have to duplicate this calculation. | |
| 83 kMaxKernelWidth = 2 * kMaxKernelRadius + 1, | |
| 84 }; | |
| 85 | |
| 86 protected: | |
| 87 | |
| 88 float fKernel[kMaxKernelWidth]; | |
| 89 bool fUseBounds; | |
| 90 float fBounds[2]; | |
| 91 | |
| 92 private: | |
| 93 GrConvolutionEffect(GrTexture*, Direction, | |
| 94 int halfWidth, | |
| 95 const float* kernel, | |
| 96 bool useBounds, | |
| 97 float bounds[2]); | |
| 98 | |
| 99 /// Convolve with a Gaussian kernel | |
| 100 GrConvolutionEffect(GrTexture*, Direction, | |
| 101 int halfWidth, | |
| 102 float gaussianSigma, | |
| 103 bool useBounds, | |
| 104 float bounds[2]); | |
| 105 | |
| 106 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; | |
| 107 | |
| 108 GR_DECLARE_EFFECT_TEST; | |
| 109 | |
| 110 typedef Gr1DKernelEffect INHERITED; | |
| 111 }; | |
| 112 | |
| 113 #endif |
