Implement color filter as GrGLEffect

src/gpu/GrPaint.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPaint.h"
 
@@ skipping 38 matching lines @@
         }
     }
     return false;
 }
 
 bool GrPaint::getOpaqueAndKnownColor(GrColor* solidColor,
                                      uint32_t* solidColorKnownComponents) const {
 
     // TODO: Share this implementation with GrDrawState
 
-    // Since fColorFilterXfermode is going away soon, we aren't attempting to handle anything but
-    // the default setting.
-    if (SkXfermode::kDst_Mode != fColorFilterXfermode) {
-        return false;
-    }
-
     GrColor coverage = GrColorPackRGBA(fCoverage, fCoverage, fCoverage, fCoverage);
     uint32_t coverageComps = kRGBA_GrColorComponentFlags;
     int count = fCoverageStages.count();
     for (int i = 0; i < count; ++i) {
         (*fCoverageStages[i].getEffect())->getConstantColorComponents(&coverage, &coverageComps);
     }
     if (kRGBA_GrColorComponentFlags != coverageComps || 0xffffffff != coverage) {
         return false;
     }
 
@@ skipping 45 matching lines @@
                 case kIConstA_GrBlendCoeff:
                     *solidColorKnownComponents = 0;
                     break;
             }
         } else {
             solidColorKnownComponents = 0;
         }
     }
     return opaque;
 }