added support for PLS path rendering

src/gpu/effects/GrCustomXfermode.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "effects/GrCustomXfermode.h"
 
 #include "GrCoordTransform.h"
@@ skipping 36 matching lines @@
     GR_STATIC_ASSERT(kExclusion_GrBlendEquation == SkXfermode::kExclusion_Mode + kOffset);
     GR_STATIC_ASSERT(kMultiply_GrBlendEquation == SkXfermode::kMultiply_Mode + kOffset);
     GR_STATIC_ASSERT(kHSLHue_GrBlendEquation == SkXfermode::kHue_Mode + kOffset);
     GR_STATIC_ASSERT(kHSLSaturation_GrBlendEquation == SkXfermode::kSaturation_Mode + kOffset);
     GR_STATIC_ASSERT(kHSLColor_GrBlendEquation == SkXfermode::kColor_Mode + kOffset);
     GR_STATIC_ASSERT(kHSLLuminosity_GrBlendEquation == SkXfermode::kLuminosity_Mode + kOffset);
     GR_STATIC_ASSERT(kGrBlendEquationCnt == SkXfermode::kLastMode + 1 + kOffset);
 }
 
 static bool can_use_hw_blend_equation(GrBlendEquation equation,
-                                      const GrProcOptInfo& coveragePOI,
+                                      const GrPipelineOptimizations& opt,
                                       const GrCaps& caps) {
     if (!caps.advancedBlendEquationSupport()) {
         return false;
     }
-    if (coveragePOI.isFourChannelOutput()) {
+    if (opt.fOverrides.fUsePLSDstRead) {
+        return false;
+    }
+    if (opt.fCoveragePOI.isFourChannelOutput()) {
         return false; // LCD coverage must be applied after the blend equation.
     }
     if (caps.canUseAdvancedBlendEquation(equation)) {
         return false;
     }
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // Xfer Processor
@@ skipping 291 matching lines @@
     : fMode(mode),
       fHWBlendEquation(hw_blend_equation(mode)) {
     SkASSERT(GrCustomXfermode::IsSupportedMode(fMode));
     this->initClassID<CustomXPFactory>();
 }
 
 GrXferProcessor* CustomXPFactory::onCreateXferProcessor(const GrCaps& caps,
                                                         const GrPipelineOptimizations& opt,
                                                         bool hasMixedSamples,
                                                         const DstTexture* dstTexture) const {
-    if (can_use_hw_blend_equation(fHWBlendEquation, opt.fCoveragePOI, caps)) {
+    if (can_use_hw_blend_equation(fHWBlendEquation, opt, caps)) {
         SkASSERT(!dstTexture || !dstTexture->texture());
         return new CustomXP(fMode, fHWBlendEquation);
     }
     return new CustomXP(dstTexture, hasMixedSamples, fMode);
 }
 
 bool CustomXPFactory::willReadDstColor(const GrCaps& caps,
                                        const GrPipelineOptimizations& optimizations,
                                        bool hasMixedSamples) const {
-    return !can_use_hw_blend_equation(fHWBlendEquation, optimizations.fCoveragePOI, caps);
+    return !can_use_hw_blend_equation(fHWBlendEquation, optimizations, caps);
 }
 
 void CustomXPFactory::getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
                                                InvariantBlendedColor* blendedColor) const {
     blendedColor->fWillBlendWithDst = true;
     blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags;
 }
 
 GR_DEFINE_XP_FACTORY_TEST(CustomXPFactory);
 const GrXPFactory* CustomXPFactory::TestCreate(GrProcessorTestData* d) {
     int mode = d->fRandom->nextRangeU(SkXfermode::kLastCoeffMode + 1,
                                       SkXfermode::kLastSeparableMode);
 
     return new CustomXPFactory(static_cast<SkXfermode::Mode>(mode));
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrXPFactory* GrCustomXfermode::CreateXPFactory(SkXfermode::Mode mode) {
     if (!GrCustomXfermode::IsSupportedMode(mode)) {
         return nullptr;
     } else {
         return new CustomXPFactory(mode);
     }
 }