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      1 /*
      2  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2007, 2008 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      5  * Copyright (C) 2009 Google, Inc.  All rights reserved.
      6  * Copyright (C) 2009 Dirk Schulze <krit (at) 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 
     37 namespace WebCore {
     38 
     39 RenderSVGContainer::RenderSVGContainer(SVGStyledElement* node)
     40     : RenderSVGModelObject(node)
     41     , m_needsBoundariesUpdate(true)
     42 {
     43 }
     44 
     45 RenderSVGContainer::~RenderSVGContainer()
     46 {
     47 }
     48 
     49 void 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 
     84 bool 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 
     94 void 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
    142 void 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 
    149 void 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 
    159 bool 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