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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2000 Simon Hausmann <hausmann (at) kde.org>
      4  *           (C) 2000 Stefan Schimanski (1Stein (at) gmx.de)
      5  * Copyright (C) 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  *
     22  */
     23 
     24 #include "config.h"
     25 #include "RenderPart.h"
     26 
     27 #include "Frame.h"
     28 #include "FrameView.h"
     29 #include "HTMLFrameElementBase.h"
     30 #include "PluginViewBase.h"
     31 #include "RenderView.h"
     32 
     33 namespace WebCore {
     34 
     35 RenderPart::RenderPart(Element* node)
     36     : RenderWidget(node)
     37 {
     38     setInline(false);
     39 }
     40 
     41 RenderPart::~RenderPart()
     42 {
     43     clearWidget();
     44 }
     45 
     46 void RenderPart::setWidget(PassRefPtr<Widget> widget)
     47 {
     48     if (widget == this->widget())
     49         return;
     50 
     51     RenderWidget::setWidget(widget);
     52 
     53     // make sure the scrollbars are set correctly for restore
     54     // ### find better fix
     55     viewCleared();
     56 }
     57 
     58 void RenderPart::viewCleared()
     59 {
     60 }
     61 
     62 #if USE(ACCELERATED_COMPOSITING)
     63 bool RenderPart::requiresLayer() const
     64 {
     65     if (RenderWidget::requiresLayer())
     66         return true;
     67 
     68     return requiresAcceleratedCompositing();
     69 }
     70 
     71 bool RenderPart::requiresAcceleratedCompositing() const
     72 {
     73     // There are two general cases in which we can return true. First, if this is a plugin
     74     // renderer and the plugin has a layer, then we need a layer. Second, if this is
     75     // a renderer with a contentDocument and that document needs a layer, then we need
     76     // a layer.
     77     if (widget() && widget()->isPluginViewBase() && static_cast<PluginViewBase*>(widget())->platformLayer())
     78         return true;
     79 
     80     if (!node() || !node()->isFrameOwnerElement())
     81         return false;
     82 
     83 #if PLATFORM(ANDROID)
     84     // FIXME: Upstream this to webkit.org
     85     // https://bugs.webkit.org/show_bug.cgi?id=52655
     86     if (style()->visibility() != VISIBLE)
     87         return false;
     88 #endif
     89 
     90     HTMLFrameOwnerElement* element = static_cast<HTMLFrameOwnerElement*>(node());
     91     if (Document* contentDocument = element->contentDocument()) {
     92         if (RenderView* view = contentDocument->renderView())
     93             return view->usesCompositing();
     94     }
     95 
     96     return false;
     97 }
     98 #endif
     99 
    100 }
    101