Added class AutoFragmentChildProcAdvance to be constructed before a child emitCode and destructed a…

src/gpu/gl/builders/GrGLFragmentShaderBuilder.h

Index: src/gpu/gl/builders/GrGLFragmentShaderBuilder.h
diff --git a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h
index 8746fffb8b101f75cb3d637045b2fa736bfd6bfd..3fb029989713adb7e000848413b0c0dd0f43a4df 100644
--- a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h
+++ b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.h
@@ -77,6 +77,27 @@ public:
         return ret;
     }
 
+    // This class is like AutoStageAdvance but used for the child procs of a fragment proc.

[tomhudson, 2015/08/14 15:58:48]

This comment requires the reader to understand AutoStageAdvance, which isn't
even in the same source file. Try to make it self-contained? The long list of
arguments sure makes it look like something complex is going on.

[wangyix, 2015/08/14 16:07:27]

Acknowledged.

+    class AutoFragmentChildProcAdvance {
+        typedef GrGLProcessor::TransformedCoordsArray TransformedCoordsArray;
+        typedef GrGLProcessor::TextureSamplerArray TextureSamplerArray;
+    public:
+        AutoFragmentChildProcAdvance(int childProcIndex,
+                                     GrGLFPBuilder* builder,
+                                     const GrFragmentProcessor& fp,
+                                     const char* outputColor,
+                                     const TransformedCoordsArray& coords,
+                                     const TextureSamplerArray& samplers,
+                                     const GrFragmentProcessor** childFp,
+                                     SkString* childOutputColor,
+                                     TransformedCoordsArray* childCoords,
+                                     TextureSamplerArray* childSamplers);
+
+        ~AutoFragmentChildProcAdvance();
+    private:
+        GrGLFragmentBuilder* fFsb;
+    };
+
 private:
     /*
      * State that tracks which child proc in the proc tree is currently emitting code.  This is