1/*
2 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2007, 2008 Rob Buis <buis@kde.org>
4 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Google, Inc.  All rights reserved.
6 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
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#include "config.h"
25
26#if ENABLE(SVG)
27#include "RenderSVGContainer.h"
28
29#include "GraphicsContext.h"
30#include "RenderSVGResource.h"
31#include "RenderSVGResourceFilter.h"
32#include "RenderView.h"
33#include "SVGRenderSupport.h"
34#include "SVGResources.h"
35#include "SVGStyledElement.h"
36
37namespace WebCore {
38
39RenderSVGContainer::RenderSVGContainer(SVGStyledElement* node)
40    : RenderSVGModelObject(node)
41    , m_needsBoundariesUpdate(true)
42{
43}
44
45RenderSVGContainer::~RenderSVGContainer()
46{
47}
48
49void RenderSVGContainer::layout()
50{
51    ASSERT(needsLayout());
52
53    // RenderSVGRoot disables layoutState for the SVG rendering tree.
54    ASSERT(!view()->layoutStateEnabled());
55
56    // Allow RenderSVGViewportContainer to update its viewport.
57    calcViewport();
58
59    LayoutRepainter repainter(*this, checkForRepaintDuringLayout() || selfWillPaint());
60
61    // Allow RenderSVGTransformableContainer to update its transform.
62    bool updatedTransform = calculateLocalTransform();
63
64    SVGRenderSupport::layoutChildren(this, selfNeedsLayout());
65
66    // Invalidate all resources of this client if our layout changed.
67    if (m_everHadLayout && selfNeedsLayout())
68        SVGResourcesCache::clientLayoutChanged(this);
69
70    // At this point LayoutRepainter already grabbed the old bounds,
71    // recalculate them now so repaintAfterLayout() uses the new bounds.
72    if (m_needsBoundariesUpdate || updatedTransform) {
73        updateCachedBoundaries();
74        m_needsBoundariesUpdate = false;
75
76        // If our bounds changed, notify the parents.
77        RenderSVGModelObject::setNeedsBoundariesUpdate();
78    }
79
80    repainter.repaintAfterLayout();
81    setNeedsLayout(false);
82}
83
84bool RenderSVGContainer::selfWillPaint()
85{
86#if ENABLE(FILTERS)
87    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
88    return resources && resources->filter();
89#else
90    return false;
91#endif
92}
93
94void RenderSVGContainer::paint(PaintInfo& paintInfo, int, int)
95{
96    if (paintInfo.context->paintingDisabled())
97        return;
98
99    // Spec: groups w/o children still may render filter content.
100    if (!firstChild() && !selfWillPaint())
101        return;
102
103    FloatRect repaintRect = repaintRectInLocalCoordinates();
104    if (!SVGRenderSupport::paintInfoIntersectsRepaintRect(repaintRect, localToParentTransform(), paintInfo))
105        return;
106
107    PaintInfo childPaintInfo(paintInfo);
108    childPaintInfo.context->save();
109
110    // Let the RenderSVGViewportContainer subclass clip if necessary
111    applyViewportClip(childPaintInfo);
112
113    childPaintInfo.applyTransform(localToParentTransform());
114
115    bool continueRendering = true;
116    if (childPaintInfo.phase == PaintPhaseForeground)
117        continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);
118
119    if (continueRendering) {
120        childPaintInfo.updatePaintingRootForChildren(this);
121        for (RenderObject* child = firstChild(); child; child = child->nextSibling())
122            child->paint(childPaintInfo, 0, 0);
123    }
124
125    if (paintInfo.phase == PaintPhaseForeground)
126        SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);
127
128    childPaintInfo.context->restore();
129
130    // FIXME: This really should be drawn from local coordinates, but currently we hack it
131    // to avoid our clip killing our outline rect.  Thus we translate our
132    // outline rect into parent coords before drawing.
133    // FIXME: This means our focus ring won't share our rotation like it should.
134    // We should instead disable our clip during PaintPhaseOutline
135    if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && style()->visibility() == VISIBLE) {
136        IntRect paintRectInParent = enclosingIntRect(localToParentTransform().mapRect(repaintRect));
137        paintOutline(paintInfo.context, paintRectInParent.x(), paintRectInParent.y(), paintRectInParent.width(), paintRectInParent.height());
138    }
139}
140
141// addFocusRingRects is called from paintOutline and needs to be in the same coordinates as the paintOuline call
142void RenderSVGContainer::addFocusRingRects(Vector<IntRect>& rects, int, int)
143{
144    IntRect paintRectInParent = enclosingIntRect(localToParentTransform().mapRect(repaintRectInLocalCoordinates()));
145    if (!paintRectInParent.isEmpty())
146        rects.append(paintRectInParent);
147}
148
149void RenderSVGContainer::updateCachedBoundaries()
150{
151    m_objectBoundingBox = FloatRect();
152    m_strokeBoundingBox = FloatRect();
153    m_repaintBoundingBox = FloatRect();
154
155    SVGRenderSupport::computeContainerBoundingBoxes(this, m_objectBoundingBox, m_strokeBoundingBox, m_repaintBoundingBox);
156    SVGRenderSupport::intersectRepaintRectWithResources(this, m_repaintBoundingBox);
157}
158
159bool RenderSVGContainer::nodeAtFloatPoint(const HitTestRequest& request, HitTestResult& result, const FloatPoint& pointInParent, HitTestAction hitTestAction)
160{
161    // Give RenderSVGViewportContainer a chance to apply its viewport clip
162    if (!pointIsInsideViewportClip(pointInParent))
163        return false;
164
165    FloatPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);
166
167    if (!SVGRenderSupport::pointInClippingArea(this, localPoint))
168        return false;
169
170    for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
171        if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
172            updateHitTestResult(result, roundedIntPoint(localPoint));
173            return true;
174        }
175    }
176
177    // Spec: Only graphical elements can be targeted by the mouse, period.
178    // 16.4: "If there are no graphics elements whose relevant graphics content is under the pointer (i.e., there is no target element), the event is not dispatched."
179    return false;
180}
181
182}
183
184#endif // ENABLE(SVG)
185