skia/ext/paint_simplifier.cc

   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