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      1 // Copyright 2011 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 "webkit/renderer/compositor_bindings/web_content_layer_impl.h"
      6 
      7 #include "base/command_line.h"
      8 #include "cc/base/switches.h"
      9 #include "cc/layers/content_layer.h"
     10 #include "cc/layers/picture_layer.h"
     11 #include "third_party/WebKit/public/platform/WebContentLayerClient.h"
     12 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
     13 #include "third_party/WebKit/public/platform/WebFloatRect.h"
     14 #include "third_party/WebKit/public/platform/WebRect.h"
     15 #include "third_party/WebKit/public/platform/WebSize.h"
     16 #include "third_party/skia/include/utils/SkMatrix44.h"
     17 
     18 using cc::ContentLayer;
     19 using cc::PictureLayer;
     20 
     21 namespace webkit {
     22 
     23 static bool usingPictureLayer() {
     24   return cc::switches::IsImplSidePaintingEnabled();
     25 }
     26 
     27 WebContentLayerImpl::WebContentLayerImpl(WebKit::WebContentLayerClient* client)
     28     : client_(client),
     29       ignore_lcd_text_change_(false) {
     30   if (usingPictureLayer())
     31     layer_ = make_scoped_ptr(new WebLayerImpl(PictureLayer::Create(this)));
     32   else
     33     layer_ = make_scoped_ptr(new WebLayerImpl(ContentLayer::Create(this)));
     34   layer_->layer()->SetIsDrawable(true);
     35   can_use_lcd_text_ = layer_->layer()->can_use_lcd_text();
     36 }
     37 
     38 WebContentLayerImpl::~WebContentLayerImpl() {
     39   if (usingPictureLayer())
     40     static_cast<PictureLayer*>(layer_->layer())->ClearClient();
     41   else
     42     static_cast<ContentLayer*>(layer_->layer())->ClearClient();
     43 }
     44 
     45 WebKit::WebLayer* WebContentLayerImpl::layer() { return layer_.get(); }
     46 
     47 void WebContentLayerImpl::setDoubleSided(bool double_sided) {
     48   layer_->layer()->SetDoubleSided(double_sided);
     49 }
     50 
     51 void WebContentLayerImpl::setDrawCheckerboardForMissingTiles(bool enable) {
     52   layer_->layer()->SetDrawCheckerboardForMissingTiles(enable);
     53 }
     54 
     55 void WebContentLayerImpl::PaintContents(SkCanvas* canvas,
     56                                         gfx::Rect clip,
     57                                         gfx::RectF* opaque) {
     58   if (!client_)
     59     return;
     60 
     61   WebKit::WebFloatRect web_opaque;
     62   // For picture layers, always record with LCD text.  PictureLayerImpl
     63   // will turn this off later during rasterization.
     64   bool use_lcd_text = usingPictureLayer() || can_use_lcd_text_;
     65   client_->paintContents(canvas, clip, use_lcd_text, web_opaque);
     66   *opaque = web_opaque;
     67 }
     68 
     69 void WebContentLayerImpl::DidChangeLayerCanUseLCDText() {
     70   // It is important to make this comparison because the LCD text status
     71   // here can get out of sync with that in the layer.
     72   if (can_use_lcd_text_ == layer_->layer()->can_use_lcd_text())
     73     return;
     74 
     75   // LCD text cannot be enabled once disabled.
     76   if (layer_->layer()->can_use_lcd_text() && ignore_lcd_text_change_)
     77     return;
     78 
     79   can_use_lcd_text_ = layer_->layer()->can_use_lcd_text();
     80   ignore_lcd_text_change_ = true;
     81   layer_->invalidate();
     82 }
     83 
     84 }  // namespace webkit
     85