Make XPFragmentBuilder only Builder with access to DstCopy.

src/gpu/effects/GrCoverageSetOpXP.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "effects/GrCoverageSetOpXP.h"
 #include "GrColor.h"
@@ skipping 56 matching lines @@
     static void GenKey(const GrProcessor& processor, const GrGLSLCaps& caps,
                        GrProcessorKeyBuilder* b) {
         const CoverageSetOpXP& xp = processor.cast<CoverageSetOpXP>();
         uint32_t key = xp.invertCoverage() ?  0x0 : 0x1;
         b->add32(key);
     };
 
 private:
     void onEmitCode(const EmitArgs& args) override {
         const CoverageSetOpXP& xp = args.fXP.cast<CoverageSetOpXP>();
-        GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
+        GrGLXPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 
         if (xp.invertCoverage()) {
             fsBuilder->codeAppendf("%s = 1.0 - %s;", args.fOutputPrimary, args.fInputCoverage);
         } else {
             fsBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, args.fInputCoverage);
         }
     }
 
     void onSetData(const GrGLProgramDataManager&, const GrXferProcessor&) override {};
 
@@ skipping 164 matching lines @@
 
 GrXPFactory* GrCoverageSetOpXPFactory::TestCreate(SkRandom* random,
                                                   GrContext*,
                                                   const GrDrawTargetCaps&,
                                                   GrTexture*[]) {
     SkRegion::Op regionOp = SkRegion::Op(random->nextULessThan(SkRegion::kLastOp + 1));
     bool invertCoverage = random->nextBool();
     return GrCoverageSetOpXPFactory::Create(regionOp, invertCoverage);
 }