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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  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  *
     23  */
     24 
     25 #include "config.h"
     26 #include "core/rendering/RenderPart.h"
     27 
     28 #include "core/frame/FrameView.h"
     29 #include "core/frame/LocalFrame.h"
     30 #include "core/html/HTMLFrameElementBase.h"
     31 #include "core/plugins/PluginView.h"
     32 #include "core/rendering/HitTestResult.h"
     33 #include "core/rendering/RenderLayer.h"
     34 #include "core/rendering/RenderView.h"
     35 #include "core/rendering/svg/RenderSVGRoot.h"
     36 
     37 namespace blink {
     38 
     39 RenderPart::RenderPart(Element* node)
     40     : RenderWidget(node)
     41 {
     42     setInline(false);
     43 }
     44 
     45 RenderPart::~RenderPart()
     46 {
     47 }
     48 
     49 LayerType RenderPart::layerTypeRequired() const
     50 {
     51     LayerType type = RenderWidget::layerTypeRequired();
     52     if (type != NoLayer)
     53         return type;
     54     return ForcedLayer;
     55 }
     56 
     57 bool RenderPart::requiresAcceleratedCompositing() const
     58 {
     59     // There are two general cases in which we can return true. First, if this is a plugin
     60     // renderer and the plugin has a layer, then we need a layer. Second, if this is
     61     // a renderer with a contentDocument and that document needs a layer, then we need
     62     // a layer.
     63     if (widget() && widget()->isPluginView() && toPluginView(widget())->platformLayer())
     64         return true;
     65 
     66     if (!node() || !node()->isFrameOwnerElement())
     67         return false;
     68 
     69     HTMLFrameOwnerElement* element = toHTMLFrameOwnerElement(node());
     70     if (element->contentFrame() && element->contentFrame()->remotePlatformLayer())
     71         return true;
     72 
     73     if (Document* contentDocument = element->contentDocument()) {
     74         if (RenderView* view = contentDocument->renderView())
     75             return view->usesCompositing();
     76     }
     77 
     78     return false;
     79 }
     80 
     81 bool RenderPart::needsPreferredWidthsRecalculation() const
     82 {
     83     if (RenderWidget::needsPreferredWidthsRecalculation())
     84         return true;
     85     return embeddedContentBox();
     86 }
     87 
     88 bool RenderPart::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
     89 {
     90     if (!widget() || !widget()->isFrameView() || !request.allowsChildFrameContent())
     91         return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
     92 
     93     // FIXME: Until RemoteFrames use RemoteFrameViews, we need an explicit check here.
     94     if (toFrameView(widget())->frame().isRemoteFrameTemporary())
     95         return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
     96 
     97     FrameView* childFrameView = toFrameView(widget());
     98     RenderView* childRoot = childFrameView->renderView();
     99 
    100     if (childRoot) {
    101         LayoutPoint adjustedLocation = accumulatedOffset + location();
    102         LayoutPoint contentOffset = LayoutPoint(borderLeft() + paddingLeft(), borderTop() + paddingTop()) - childFrameView->scrollOffset();
    103         HitTestLocation newHitTestLocation(locationInContainer, -adjustedLocation - contentOffset);
    104         HitTestRequest newHitTestRequest(request.type() | HitTestRequest::ChildFrameHitTest);
    105         HitTestResult childFrameResult(newHitTestLocation);
    106 
    107         bool isInsideChildFrame = childRoot->hitTest(newHitTestRequest, newHitTestLocation, childFrameResult);
    108 
    109         if (newHitTestLocation.isRectBasedTest())
    110             result.append(childFrameResult);
    111         else if (isInsideChildFrame)
    112             result = childFrameResult;
    113 
    114         if (isInsideChildFrame)
    115             return true;
    116     }
    117 
    118     return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
    119 }
    120 
    121 CompositingReasons RenderPart::additionalCompositingReasons() const
    122 {
    123     if (requiresAcceleratedCompositing())
    124         return CompositingReasonIFrame;
    125     return CompositingReasonNone;
    126 }
    127 
    128 }
    129