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| 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 GrDisableColorXP_DEFINED |
| 9 #define GrDisableColorXP_DEFINED |
| 10 |
| 11 #include "GrTypes.h" |
| 12 #include "GrXferProcessor.h" |
| 13 |
| 14 class GrProcOptInfo; |
| 15 |
| 16 /** |
| 17 * This xfer processor disables color writing. Thus color and coverage and ignor
ed and no blending |
| 18 * occurs. This XP is usful for things like stenciling. |
| 19 */ |
| 20 class GrDisableColorXP : public GrXferProcessor { |
| 21 public: |
| 22 static GrXferProcessor* Create() { |
| 23 return SkNEW(GrDisableColorXP); |
| 24 } |
| 25 |
| 26 ~GrDisableColorXP() SK_OVERRIDE {}; |
| 27 |
| 28 const char* name() const SK_OVERRIDE { return "Disable Color"; } |
| 29 |
| 30 void getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const
SK_OVERRIDE; |
| 31 |
| 32 GrGLXferProcessor* createGLInstance() const SK_OVERRIDE; |
| 33 |
| 34 bool hasSecondaryOutput() const SK_OVERRIDE { return false; } |
| 35 |
| 36 GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI, |
| 37 const GrProcOptInfo& coveragePOI, |
| 38 bool doesStencilWrite, |
| 39 GrColor* color, |
| 40 const GrDrawTargetCaps& caps) SK_
OVERRIDE { |
| 41 return GrXferProcessor::kIgnoreColor_OptFlag | GrXferProcessor::kIgnoreC
overage_OptFlag; |
| 42 } |
| 43 |
| 44 void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const SK_OVERRIDE; |
| 45 |
| 46 private: |
| 47 GrDisableColorXP(); |
| 48 |
| 49 bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE { |
| 50 return true; |
| 51 } |
| 52 |
| 53 typedef GrXferProcessor INHERITED; |
| 54 }; |
| 55 |
| 56 /////////////////////////////////////////////////////////////////////////////// |
| 57 |
| 58 class GrDisableColorXPFactory : public GrXPFactory { |
| 59 public: |
| 60 static GrXPFactory* Create() { |
| 61 return SkNEW(GrDisableColorXPFactory); |
| 62 } |
| 63 |
| 64 GrXferProcessor* createXferProcessor(const GrProcOptInfo& colorPOI, |
| 65 const GrProcOptInfo& coveragePOI) const
SK_OVERRIDE; |
| 66 |
| 67 bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const
SK_OVERRIDE { |
| 68 return true; |
| 69 } |
| 70 |
| 71 bool canApplyCoverage(const GrProcOptInfo& colorPOI, |
| 72 const GrProcOptInfo& coveragePOI) const SK_OVERRIDE { |
| 73 return true; |
| 74 } |
| 75 |
| 76 bool canTweakAlphaForCoverage() const SK_OVERRIDE { return true; } |
| 77 |
| 78 void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo&
coveragePOI, |
| 79 GrXPFactory::InvariantOutput* output) const SK_OVERR
IDE { |
| 80 output->fBlendedColorFlags = 0; |
| 81 output->fWillBlendWithDst = 0; |
| 82 } |
| 83 |
| 84 bool willReadDst(const GrProcOptInfo& colorPOI, |
| 85 const GrProcOptInfo& coveragePOI) const SK_OVERRIDE { |
| 86 return false; |
| 87 } |
| 88 |
| 89 private: |
| 90 GrDisableColorXPFactory(); |
| 91 |
| 92 bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE { |
| 93 return true; |
| 94 } |
| 95 |
| 96 GR_DECLARE_XP_FACTORY_TEST; |
| 97 |
| 98 typedef GrXPFactory INHERITED; |
| 99 }; |
| 100 |
| 101 #endif |
| 102 |
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