skia: Use medium filter quality in PaintSimplifier.

skia/ext/paint_simplifier.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <limits>
+
 #include "skia/ext/paint_simplifier.h"
 #include "third_party/skia/include/core/SkPaint.h"
 
 namespace skia {
 
 PaintSimplifier::PaintSimplifier()
   : INHERITED() {
 
 }
 
 PaintSimplifier::~PaintSimplifier() {
 
 }
 
 bool PaintSimplifier::filter(SkPaint* paint, Type type) {
 
   // Preserve a modicum of text quality; black & white text is
   // just too blocky, even during a fling.
   if (type != kText_Type) {
     paint->setAntiAlias(false);
   }
   paint->setSubpixelText(false);
   paint->setLCDRenderText(false);
 
+  // Reduce filter level to medium or less. Note that reducing the filter to
+  // less than medium can have a negative effect on performance as the filtered
+  // image is not cached in this case.
+  paint->setFilterLevel(
+      std::min(paint->getFilterLevel(), SkPaint::kMedium_FilterLevel));
+
   paint->setMaskFilter(NULL);
 
   // Uncomment this line to shade simplified tiles pink during debugging.
   //paint->setColor(SkColorSetRGB(255, 127, 127));
 
   return true;
 }
 
 
 }  // namespace skia