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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "skia/ext/paint_simplifier.h"
      6 #include "third_party/skia/include/core/SkPaint.h"
      7 #include "third_party/skia/include/core/SkShader.h"
      8 
      9 namespace skia {
     10 namespace {
     11 
     12 bool PaintHasBitmap(const SkPaint &paint) {
     13   SkShader* shader = paint.getShader();
     14   if (!shader)
     15     return false;
     16 
     17   if (shader->asAGradient(NULL) == SkShader::kNone_GradientType)
     18     return false;
     19 
     20   return shader->asABitmap(NULL, NULL, NULL) != SkShader::kNone_BitmapType;
     21 }
     22 
     23 }  // namespace
     24 
     25 PaintSimplifier::PaintSimplifier()
     26   : INHERITED() {
     27 
     28 }
     29 
     30 PaintSimplifier::~PaintSimplifier() {
     31 
     32 }
     33 
     34 bool PaintSimplifier::filter(SkPaint* paint, Type type) {
     35   // Bitmaps are expensive. Skip draw if type has a bitmap.
     36   if (type == kBitmap_Type || PaintHasBitmap(*paint))
     37     return false;
     38 
     39   // Preserve a modicum of text quality; black & white text is
     40   // just too blocky, even during a fling.
     41   if (type != kText_Type) {
     42     paint->setAntiAlias(false);
     43   }
     44   paint->setSubpixelText(false);
     45   paint->setLCDRenderText(false);
     46 
     47   paint->setMaskFilter(NULL);
     48 
     49   // Uncomment this line to shade simplified tiles pink during debugging.
     50   //paint->setColor(SkColorSetRGB(255, 127, 127));
     51 
     52   return true;
     53 }
     54 
     55 
     56 }  // namespace skia
     57 
     58 
     59