1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
4 *           (C) 2000 Stefan Schimanski (1Stein@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
37namespace blink {
38
39RenderPart::RenderPart(Element* node)
40    : RenderWidget(node)
41{
42    setInline(false);
43}
44
45RenderPart::~RenderPart()
46{
47}
48
49LayerType RenderPart::layerTypeRequired() const
50{
51    LayerType type = RenderWidget::layerTypeRequired();
52    if (type != NoLayer)
53        return type;
54    return ForcedLayer;
55}
56
57bool 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
81bool RenderPart::needsPreferredWidthsRecalculation() const
82{
83    if (RenderWidget::needsPreferredWidthsRecalculation())
84        return true;
85    return embeddedContentBox();
86}
87
88bool 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
121CompositingReasons RenderPart::additionalCompositingReasons() const
122{
123    if (requiresAcceleratedCompositing())
124        return CompositingReasonIFrame;
125    return CompositingReasonNone;
126}
127
128}
129