Potentially optimize some GrGLEffects for known input color values

src/effects/gradients/SkSweepGradient.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 "SkSweepGradient.h"
 
@@ skipping 383 matching lines @@
 public:
 
     GrGLSweepGradient(const GrBackendEffectFactory& factory,
                       const GrDrawEffect&) : INHERITED (factory) { }
     virtual ~GrGLSweepGradient() { }
 
     virtual void emitCode(GrGLShaderBuilder*,
                           const GrDrawEffect&,
                           EffectKey,
                           const char* outputColor,
-                          const char* inputColor,
+                          const GrGLSLExpr4& inputColor,
                           const TransformedCoordsArray&,
                           const TextureSamplerArray&) SK_OVERRIDE;
 
     static EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
         return GenBaseGradientKey(drawEffect);
     }
 
 private:
 
     typedef GrGLGradientEffect INHERITED;
@@ skipping 49 matching lines @@
     SkPaint paint;
     return shader->asNewEffect(context, paint);
 }
 
 /////////////////////////////////////////////////////////////////////
 
 void GrGLSweepGradient::emitCode(GrGLShaderBuilder* builder,
                                  const GrDrawEffect&,
                                  EffectKey key,
                                  const char* outputColor,
-                                 const char* inputColor,
+                                 const GrGLSLExpr4& inputColor,
                                  const TransformedCoordsArray& coords,
                                  const TextureSamplerArray& samplers) {
     this->emitUniforms(builder, key);
     SkString coords2D = builder->ensureFSCoords2D(coords, 0);
     SkString t;
     t.printf("atan(- %s.y, - %s.x) * 0.1591549430918 + 0.5", coords2D.c_str(), coords2D.c_str());
     this->emitColor(builder, t.c_str(), key,
                           outputColor, inputColor, samplers);
 }
 
@@ skipping 25 matching lines @@
     str->appendScalar(fCenter.fX);
     str->append(", ");
     str->appendScalar(fCenter.fY);
     str->append(") ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif