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 GrCoverageSetOpXP_DEFINED 9 #define GrCoverageSetOpXP_DEFINED 10 11 #include "include/core/SkRegion.h" 12 #include "include/gpu/GrTypes.h" 13 #include "src/gpu/ganesh/GrProcessorUnitTest.h" 14 #include "src/gpu/ganesh/GrXferProcessor.h" 15 16 // See the comment above GrXPFactory's definition about this warning suppression. 17 #if defined(__GNUC__) 18 #pragma GCC diagnostic push 19 #pragma GCC diagnostic ignored "-Wnon-virtual-dtor" 20 #endif 21 #if defined(__clang__) 22 #pragma clang diagnostic push 23 #pragma clang diagnostic ignored "-Wnon-virtual-dtor" 24 #endif 25 26 /** 27 * This xfer processor directly blends the the src coverage with the dst using a set operator. It is 28 * useful for rendering coverage masks using CSG. It can optionally invert the src coverage before 29 * applying the set operator. 30 */ 31 class GrCoverageSetOpXPFactory : public GrXPFactory { 32 public: 33 static const GrXPFactory* Get(SkRegion::Op regionOp, bool invertCoverage = false); 34 35 private: 36 constexpr GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage); 37 38 sk_sp<const GrXferProcessor> makeXferProcessor(const GrProcessorAnalysisColor&, 39 GrProcessorAnalysisCoverage, 40 const GrCaps&, 41 GrClampType) const override; 42 analysisProperties(const GrProcessorAnalysisColor & color,const GrProcessorAnalysisCoverage & coverage,const GrCaps &,GrClampType)43 AnalysisProperties analysisProperties(const GrProcessorAnalysisColor& color, 44 const GrProcessorAnalysisCoverage& coverage, 45 const GrCaps&, 46 GrClampType) const override { 47 auto props = AnalysisProperties::kIgnoresInputColor; 48 switch (fRegionOp) { 49 case SkRegion::kReplace_Op: 50 props |= AnalysisProperties::kUnaffectedByDstValue; 51 break; 52 case SkRegion::kUnion_Op: 53 case SkRegion::kDifference_Op: 54 // FIXME: If we can formalize the fact that this op only operates on alpha, we can 55 // set AnalysisProperties::kUnaffectedByDstValue if color/coverage are all opaque. 56 break; 57 case SkRegion::kIntersect_Op: 58 case SkRegion::kXOR_Op: 59 case SkRegion::kReverseDifference_Op: 60 break; 61 } 62 return props; 63 } 64 65 66 GR_DECLARE_XP_FACTORY_TEST 67 68 SkRegion::Op fRegionOp; 69 bool fInvertCoverage; 70 71 using INHERITED = GrXPFactory; 72 }; 73 #if defined(__GNUC__) 74 #pragma GCC diagnostic pop 75 #endif 76 #if defined(__clang__) 77 #pragma clang diagnostic pop 78 #endif 79 80 #endif 81