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| 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 "SkTypes.h" |
| 12 |
| 13 #if SK_SUPPORT_GPU |
| 14 |
| 15 #include "GrFragmentProcessor.h" |
| 16 #include "GrProcessorUnitTest.h" |
| 17 |
| 18 class GrTextureProvider; |
| 19 |
| 20 // This FP handles the special case of a blurred circle. It uses a 1D |
| 21 // profile that is just rotated about the origin of the circle. |
| 22 class GrCircleBlurFragmentProcessor : public GrFragmentProcessor { |
| 23 public: |
| 24 ~GrCircleBlurFragmentProcessor() override {}; |
| 25 |
| 26 const char* name() const override { return "CircleBlur"; } |
| 27 |
| 28 static const GrFragmentProcessor* Create(GrTextureProvider*textureProvider, |
| 29 const SkRect& circle, float sigma)
{ |
| 30 float offset; |
| 31 |
| 32 SkAutoTUnref<GrTexture> blurProfile(CreateCircleBlurProfileTexture(textu
reProvider, |
| 33 circl
e, |
| 34 sigma
, |
| 35 &offs
et)); |
| 36 if (!blurProfile) { |
| 37 return nullptr; |
| 38 } |
| 39 return new GrCircleBlurFragmentProcessor(circle, sigma, offset, blurProf
ile); |
| 40 } |
| 41 |
| 42 const SkRect& circle() const { return fCircle; } |
| 43 float sigma() const { return fSigma; } |
| 44 float offset() const { return fOffset; } |
| 45 int profileSize() const { return fBlurProfileAccess.getTexture()->width(); } |
| 46 |
| 47 private: |
| 48 GrCircleBlurFragmentProcessor(const SkRect& circle, float sigma, |
| 49 float offset, GrTexture* blurProfile); |
| 50 |
| 51 GrGLFragmentProcessor* onCreateGLInstance() const override; |
| 52 |
| 53 void onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) c
onst override; |
| 54 |
| 55 bool onIsEqual(const GrFragmentProcessor& other) const override { |
| 56 const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragm
entProcessor>(); |
| 57 // fOffset is computed from the circle width and the sigma |
| 58 return this->circle().width() == cbfp.circle().width() && fSigma == cbfp
.fSigma; |
| 59 } |
| 60 |
| 61 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; |
| 62 |
| 63 static GrTexture* CreateCircleBlurProfileTexture(GrTextureProvider*, |
| 64 const SkRect& circle, |
| 65 float sigma, float* offset)
; |
| 66 |
| 67 SkRect fCircle; |
| 68 float fSigma; |
| 69 float fOffset; |
| 70 GrTextureAccess fBlurProfileAccess; |
| 71 |
| 72 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; |
| 73 |
| 74 typedef GrFragmentProcessor INHERITED; |
| 75 }; |
| 76 |
| 77 #endif |
| 78 #endif |
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