Add mixed samples support to XPs

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 "GrCaps.h"
@@ skipping 206 matching lines @@
         }
         default:
             return NULL;
     }
 }
 
 GrXferProcessor*
 GrCoverageSetOpXPFactory::onCreateXferProcessor(const GrCaps& caps,
                                                 const GrProcOptInfo& colorPOI,
                                                 const GrProcOptInfo& covPOI,
+                                                bool hasMixedSamples,
                                                 const DstTexture* dst) const {
+    // We don't support inverting coverage with mixed samples. We don't expect to ever want this in
+    // the future, however we could at some point make this work using an inverted coverage
+    // modulation table. Note that an inverted table still won't work if there are coverage procs.
+    if (fInvertCoverage && hasMixedSamples) {
+        SkASSERT(false);
+        return NULL;
+    }
+
     return CoverageSetOpXP::Create(fRegionOp, fInvertCoverage);
 }
 
 void GrCoverageSetOpXPFactory::getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
                                                         InvariantBlendedColor* blendedColor) const {
     blendedColor->fWillBlendWithDst = SkRegion::kReplace_Op != fRegionOp;
     blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags;
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrCoverageSetOpXPFactory);
 
 GrXPFactory* GrCoverageSetOpXPFactory::TestCreate(SkRandom* random,
                                                   GrContext*,
                                                   const GrCaps&,
                                                   GrTexture*[]) {
     SkRegion::Op regionOp = SkRegion::Op(random->nextULessThan(SkRegion::kLastOp + 1));
     bool invertCoverage = random->nextBool();
     return GrCoverageSetOpXPFactory::Create(regionOp, invertCoverage);
 }