Mangle output var in GrGLFragmentProcessor::emitChild

src/gpu/gl/GrGLFragmentProcessor.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLFragmentProcessor.h"
 #include "GrFragmentProcessor.h"
 #include "builders/GrGLFragmentShaderBuilder.h"
 #include "builders/GrGLProgramBuilder.h"
 
 void GrGLFragmentProcessor::setData(const GrGLProgramDataManager& pdman,
                                     const GrFragmentProcessor& processor) {
     this->onSetData(pdman, processor);
     SkASSERT(fChildProcessors.count() == processor.numChildProcessors());
     for (int i = 0; i < fChildProcessors.count(); ++i) {
         fChildProcessors[i]->setData(pdman, processor.childProcessor(i));
     }
 }
 
+void GrGLFragmentProcessor::emitChild(int childIndex, const char* inputColor, EmitArgs& args) {
+    this->internalEmitChild(childIndex, inputColor, args.fOutputColor, args);
+}
+
 void GrGLFragmentProcessor::emitChild(int childIndex, const char* inputColor,
-                                      const char* outputColor, EmitArgs& args) {
+                                      SkString* outputColor, EmitArgs& args) {
+
+    SkASSERT(outputColor);
     GrGLFragmentBuilder* fb = args.fBuilder->getFragmentShaderBuilder();
+    outputColor->append(fb->getMangleString());
+    fb->codeAppendf("vec4 %s;", outputColor->c_str());
+    this->internalEmitChild(childIndex, inputColor, outputColor->c_str(), args);
+}
+
+void GrGLFragmentProcessor::internalEmitChild(int childIndex, const char* inputColor,
+                                               const char* outputColor, EmitArgs& args) {
+    GrGLFragmentBuilder* fb = args.fBuilder->getFragmentShaderBuilder();
+
     fb->onBeforeChildProcEmitCode();  // call first so mangleString is updated
 
     const GrFragmentProcessor& childProc = args.fFp.childProcessor(childIndex);
 
     /*
      * We now want to find the subset of coords and samplers that belong to the child and its
      * descendants and put that into childCoords and childSamplers. To do so, we'll do a forwards
      * linear search.
      *
      * Explanation:
@@ skipping 46 matching lines @@
                        childProc,
                        outputColor,
                        inputColor,
                        childCoords,
                        childSamplers);
     this->childProcessor(childIndex)->emitCode(childArgs);
     fb->codeAppend("}\n");
 
     fb->onAfterChildProcEmitCode();
 }