Don't compare coord change matrices to determine effect compatibility when using explicit local coo…

src/gpu/gl/GrGLProgramEffects.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 "GrGLProgramEffects.h"
 #include "GrDrawEffect.h"
 #include "gl/GrGLEffect.h"
@@ skipping 72 matching lines @@
                kPosition_GrCoordSet :
                kLocal_GrCoordSet;
 }
 
 /**
  * Retrieves the final matrix that a transform needs to apply to its source coords.
  */
 SkMatrix get_transform_matrix(const GrDrawEffect& drawEffect, int transformIdx) {
     const GrCoordTransform& coordTransform = drawEffect.effect()->coordTransform(transformIdx);
     SkMatrix combined;
-    if (kLocal_GrCoordSet == coordTransform.sourceCoords() &&
-        !drawEffect.programHasExplicitLocalCoords()) {
+
+    if (kLocal_GrCoordSet == coordTransform.sourceCoords()) {
+        // If we have explicit local coords then we shouldn't need a coord change.
+        SkASSERT(!drawEffect.programHasExplicitLocalCoords() ||
+                 drawEffect.getCoordChangeMatrix().isIdentity());
         combined.setConcat(coordTransform.getMatrix(), drawEffect.getCoordChangeMatrix());
     } else {
         combined = coordTransform.getMatrix();
     }
     if (coordTransform.reverseY()) {
         // combined.postScale(1,-1);
         // combined.postTranslate(0,1);
         combined.set(SkMatrix::kMSkewY,
             combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
         combined.set(SkMatrix::kMScaleY,
@@ skipping 396 matching lines @@
 }
 
 void GrGLPathTexGenProgramEffectsBuilder::emitEffect(const GrEffectStage& stage,
                                                      const GrEffectKey& key,
                                                      const char* outColor,
                                                      const char* inColor,
                                                      int stageIndex) {
     SkASSERT(NULL != fProgramEffects.get());
     fProgramEffects->emitEffect(fBuilder, stage, key, outColor, inColor, stageIndex);
 }