Create helper functions to use in computeInvariantOutput calls

src/gpu/effects/GrCustomCoordsTextureEffect.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 "GrCustomCoordsTextureEffect.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 #include "gl/GrGLProcessor.h"
@@ skipping 55 matching lines @@
                                                          GrShaderVar::kAttribute_TypeModifier))) {
     this->addTextureAccess(&fTextureAccess);
 }
 
 bool GrCustomCoordsTextureEffect::onIsEqual(const GrProcessor& other) const {
     const GrCustomCoordsTextureEffect& cte = other.cast<GrCustomCoordsTextureEffect>();
     return fTextureAccess == cte.fTextureAccess;
 }
 
 void GrCustomCoordsTextureEffect::onComputeInvariantOutput(InvariantOutput* inout) const {
-    if (inout->isOpaque() && GrPixelConfigIsOpaque(this->texture(0)->config())) {
-        inout->fValidFlags = kA_GrColorComponentFlag;
+    if (GrPixelConfigIsOpaque(this->texture(0)->config())) {
+        inout->mulByUnknownOpaqueColor();
     } else {
-        inout->fValidFlags = 0;
+        inout->mulByUnknownColor();
     }
-    inout->fIsSingleComponent = false;
 }
 
 const GrBackendGeometryProcessorFactory& GrCustomCoordsTextureEffect::getFactory() const {
     return GrTBackendGeometryProcessorFactory<GrCustomCoordsTextureEffect>::getInstance();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrCustomCoordsTextureEffect);
 
@@ skipping 10 matching lines @@
     };
     SkShader::TileMode tileModes[] = {
         kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
         kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
     };
     GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode :
                                                            GrTextureParams::kNone_FilterMode);
 
     return GrCustomCoordsTextureEffect::Create(textures[texIdx], params);
 }