Implement color filter as GrGLEffect

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrTextureDomainEffect.h"
@@ skipping 490 matching lines @@
     if (NULL != colorFilter) {
         // if the source color is a constant then apply the filter here once rather than per pixel
         // in a shader.
         if (constantColor) {
             SkColor filtered = colorFilter->filterColor(skPaint.getColor());
             grPaint->setColor(SkColor2GrColor(filtered));
         } else {
             SkAutoTUnref<GrEffectRef> effect(colorFilter->asNewEffect(dev->context()));
             if (NULL != effect.get()) {
                 grPaint->addColorEffect(effect);
-            } else {
-                // TODO: rewrite this using asNewEffect()
-                SkColor color;
-                SkXfermode::Mode filterMode;
-                if (colorFilter->asColorMode(&color, &filterMode)) {
-                    grPaint->setXfermodeColorFilter(filterMode, SkColor2GrColor(color));
-                }
             }
         }
     }
 
     return true;
 }
 
 // This function is similar to skPaint2GrPaintNoShader but also converts
 // skPaint's shader to a GrTexture/GrEffectStage if possible. The texture to
 // be used is set on grPaint and returned in param act. constantColor has the
@@ skipping 1350 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     SkASSERT(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }