Make texture domain a helper so that it can be incorporated into other effects.

src/gpu/gl/GrGLShaderBuilder.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLShaderBuilder_DEFINED
 #define GrGLShaderBuilder_DEFINED
 
@@ skipping 190 matching lines @@
     GrGLUniformManager::UniformHandle getColorUniform() const { return fColorUniform; }
     GrGLUniformManager::UniformHandle getCoverageUniform() const { return fCoverageUniform; }
     GrGLUniformManager::UniformHandle getDstCopySamplerUniform() const {
         return fDstCopySamplerUniform;
     }
 
     bool finish(GrGLuint* outProgramId);
 
     const GrGLContextInfo& ctxInfo() const;
 
+    /**
+     * Helper for begining and ending a block in the fragment code. TODO: Make GrGLShaderBuilder
+     * aware of all blocks and turn single \t's into the correct number of tabs (or spaces) so that
+     * our shaders print pretty without effect writers tracking indentation.
+     */
+    class FSBlock {
+    public:
+        FSBlock(GrGLShaderBuilder* builder) : fBuilder(builder) {
+            SkASSERT(NULL != builder);
+            fBuilder->fsCodeAppend("\t{\n");
+        }
+
+        ~FSBlock() {
+            fBuilder->fsCodeAppend("\t}\n");
+        }
+    private:
+        GrGLShaderBuilder* fBuilder;
+    };
+
 protected:
     GrGpuGL* gpu() const { return fGpu; }
 
     void setInputColor(const GrGLSLExpr4& inputColor) { fInputColor = inputColor; }
     void setInputCoverage(const GrGLSLExpr4& inputCoverage) { fInputCoverage = inputCoverage; }
 
     /** Add input/output variable declarations (i.e. 'varying') to the fragment shader. */
     GrGLShaderVar& fsInputAppend() { return fFSInputs.push_back(); }
 
     // Generates a name for a variable. The generated string will be name prefixed by the prefix
@@ skipping 226 matching lines @@
                 int effectCnt,
                 GrGLSLExpr4* inOutFSColor) SK_OVERRIDE;
 
 private:
     int fNumTexCoordSets;
 
     typedef GrGLShaderBuilder INHERITED;
 };
 
 #endif