Add more specialized fragment builders

src/gpu/GrFragmentProcessor.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 "GrFragmentProcessor.h"
 #include "GrCoordTransform.h"
@@ skipping 135 matching lines @@
             this->registerChildProcessor(processor);
         }
 
         const char* name() const override { return "Premultiply"; }
 
     private:
         GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
             class GLFP : public GrGLSLFragmentProcessor {
             public:
                 void emitCode(EmitArgs& args) override {
-                    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+                    GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
                     this->emitChild(0, nullptr, args);
                     fragBuilder->codeAppendf("%s.rgb *= %s.rgb;", args.fOutputColor,
                                                                 args.fInputColor);
                     fragBuilder->codeAppendf("%s *= %s.a;", args.fOutputColor, args.fInputColor);
                 }
             };
             return new GLFP;
         }
 
         void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override {}
@@ skipping 202 matching lines @@
         }
     }
 
     if (1 == cnt) {
         return SkRef(series[0]);
     } else {
         return new SeriesFragmentProcessor(series, cnt);
     }
 }