bitmapshader with A8 bitmap should be colorized by the paint's color

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/GrBicubicEffect.h"
@@ skipping 557 matching lines @@
 
     // SkShader::asNewEffect() may do offscreen rendering. Setup default drawing state and require
     // the shader to set a render target .
     GrContext::AutoWideOpenIdentityDraw awo(dev->context(), NULL);
 
     // setup the shader as the first color effect on the paint
     SkAutoTUnref<GrEffectRef> effect(shader->asNewEffect(dev->context(), skPaint));
     if (NULL != effect.get()) {
         grPaint->addColorEffect(effect);
         // Now setup the rest of the paint.
+        // If the shader's bitmap is kA8_Config, the paint's RGB is used, and
+        // modulated by the shader's alpha. Otherwise, the shader's RGB is used,
+        // modulated by the paint's alpha.
+        SkBitmap* bitmap = shader->getBitmap();
+        if (NULL != bitmap && SkBitmap::kA8_Config == bitmap->config()) {
+            return skPaint2GrPaintNoShader(dev, skPaint, false, true, grPaint);
+        }
         return skPaint2GrPaintNoShader(dev, skPaint, true, false, grPaint);
     } else {
         // We still don't have SkColorShader::asNewEffect() implemented.
         SkShader::GradientInfo info;
         SkColor                color;
 
         info.fColors = &color;
         info.fColorOffsets = NULL;
         info.fColorCount = 1;
         if (SkShader::kColor_GradientType == shader->asAGradient(&info)) {
@@ skipping 1404 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     SkASSERT(texture && texture->asRenderTarget());
     // This constructor is called from onCreateDevice. 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;
 }