Potentially optimize some GrGLEffects for known input color values

src/gpu/GrAARectRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAARectRenderer.h"
 #include "GrGpu.h"
 #include "gl/GrGLEffect.h"
@@ skipping 31 matching lines @@
 
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             // setup the varying for the Axis aligned rect effect
             //      xy -> interpolated offset
             //      zw -> w/2+0.5, h/2+0.5
             const char *vsRectName, *fsRectName;
             builder->addVarying(kVec4f_GrSLType, "Rect", &vsRectName, &fsRectName);
             const SkString* attr0Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsRectName, attr0Name->c_str());
@@ skipping 16 matching lines @@
             builder->fsCodeAppendf(
                 "\tfloat coverage = scaleW*clamp((%s.z-abs(%s.x))/spanW, 0.0, 1.0);\n", fsRectName,
                 fsRectName);
             // Compute the coverage for the rect's height and merge with the width
             builder->fsCodeAppendf(
                 "\tcoverage = coverage*scaleH*clamp((%s.w-abs(%s.y))/spanH, 0.0, 1.0);\n",
                 fsRectName, fsRectName);
 
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("coverage")).c_str());
+                                   (inputColor * GrGLSLExpr1("coverage")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             return 0;
         }
 
         virtual void setData(const GrGLUniformManager& uman, const GrDrawEffect&) SK_OVERRIDE {}
 
     private:
         typedef GrGLVertexEffect INHERITED;
@@ skipping 60 matching lines @@
 
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             // setup the varying for the center point and the unit vector
             // that points down the height of the rect
             const char *vsRectEdgeName, *fsRectEdgeName;
             builder->addVarying(kVec4f_GrSLType, "RectEdge",
                                 &vsRectEdgeName, &fsRectEdgeName);
             const SkString* attr0Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsRectEdgeName, attr0Name->c_str());
@@ skipping 31 matching lines @@
 
             // Compute the coverage for the rect's height and merge with the width
             builder->fsCodeAppendf("\tperpDot = abs(dot(offset, %s.zw));\n",
                                    fsRectEdgeName);
             builder->fsCodeAppendf(
                     "\tcoverage = coverage*scaleH*clamp((%s.y-perpDot)/spanH, 0.0, 1.0);\n",
                     fsWidthHeightName);
 
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("coverage")).c_str());
+                                   (inputColor * GrGLSLExpr1("coverage")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             return 0;
         }
 
         virtual void setData(const GrGLUniformManager& uman, const GrDrawEffect&) SK_OVERRIDE {}
 
     private:
         typedef GrGLVertexEffect INHERITED;
@@ skipping 573 matching lines @@
     // can't call mapRect for devInside since it calls sort
     combinedMatrix.mapPoints((SkPoint*)&devInside, (const SkPoint*)&rects[1], 2);
 
     if (devInside.isEmpty()) {
         this->fillAARect(gpu, target, devOutside, SkMatrix::I(), devOutside, useVertexCoverage);
         return;
     }
 
     this->geometryStrokeAARect(gpu, target, devOutside, devInside, useVertexCoverage);
 }