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      1 /*
      2  * Copyright (C) 2006 Apple Computer, Inc.
      3  * Copyright (C) 2009 Google, Inc.
      4  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #include "core/rendering/svg/RenderSVGForeignObject.h"
     25 
     26 #include "core/rendering/HitTestResult.h"
     27 #include "core/rendering/LayoutRectRecorder.h"
     28 #include "core/rendering/LayoutRepainter.h"
     29 #include "core/rendering/RenderView.h"
     30 #include "core/rendering/svg/SVGRenderSupport.h"
     31 #include "core/rendering/svg/SVGRenderingContext.h"
     32 #include "core/rendering/svg/SVGResourcesCache.h"
     33 #include "core/svg/SVGForeignObjectElement.h"
     34 #include "platform/graphics/GraphicsContextStateSaver.h"
     35 
     36 namespace WebCore {
     37 
     38 RenderSVGForeignObject::RenderSVGForeignObject(SVGForeignObjectElement* node)
     39     : RenderSVGBlock(node)
     40     , m_needsTransformUpdate(true)
     41 {
     42 }
     43 
     44 RenderSVGForeignObject::~RenderSVGForeignObject()
     45 {
     46 }
     47 
     48 void RenderSVGForeignObject::paint(PaintInfo& paintInfo, const LayoutPoint&)
     49 {
     50     if (paintInfo.context->paintingDisabled()
     51         || (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection))
     52         return;
     53 
     54     PaintInfo childPaintInfo(paintInfo);
     55     GraphicsContextStateSaver stateSaver(*childPaintInfo.context);
     56     childPaintInfo.applyTransform(localTransform());
     57 
     58     if (SVGRenderSupport::isOverflowHidden(this))
     59         childPaintInfo.context->clip(m_viewport);
     60 
     61     SVGRenderingContext renderingContext;
     62     bool continueRendering = true;
     63     if (paintInfo.phase == PaintPhaseForeground) {
     64         renderingContext.prepareToRenderSVGContent(this, childPaintInfo);
     65         continueRendering = renderingContext.isRenderingPrepared();
     66     }
     67 
     68     if (continueRendering) {
     69         // Paint all phases of FO elements atomically, as though the FO element established its
     70         // own stacking context.
     71         bool preservePhase = paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip;
     72         LayoutPoint childPoint = IntPoint();
     73         childPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground;
     74         RenderBlock::paint(childPaintInfo, IntPoint());
     75         if (!preservePhase) {
     76             childPaintInfo.phase = PaintPhaseChildBlockBackgrounds;
     77             RenderBlock::paint(childPaintInfo, childPoint);
     78             childPaintInfo.phase = PaintPhaseFloat;
     79             RenderBlock::paint(childPaintInfo, childPoint);
     80             childPaintInfo.phase = PaintPhaseForeground;
     81             RenderBlock::paint(childPaintInfo, childPoint);
     82             childPaintInfo.phase = PaintPhaseOutline;
     83             RenderBlock::paint(childPaintInfo, childPoint);
     84         }
     85     }
     86 }
     87 
     88 LayoutRect RenderSVGForeignObject::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const
     89 {
     90     return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);
     91 }
     92 
     93 void RenderSVGForeignObject::computeFloatRectForRepaint(const RenderLayerModelObject* repaintContainer, FloatRect& repaintRect, bool fixed) const
     94 {
     95     SVGRenderSupport::computeFloatRectForRepaint(this, repaintContainer, repaintRect, fixed);
     96 }
     97 
     98 const AffineTransform& RenderSVGForeignObject::localToParentTransform() const
     99 {
    100     m_localToParentTransform = localTransform();
    101     m_localToParentTransform.translate(m_viewport.x(), m_viewport.y());
    102     return m_localToParentTransform;
    103 }
    104 
    105 void RenderSVGForeignObject::updateLogicalWidth()
    106 {
    107     // FIXME: Investigate in size rounding issues
    108     // FIXME: Remove unnecessary rounding when layout is off ints: webkit.org/b/63656
    109     setWidth(static_cast<int>(roundf(m_viewport.width())));
    110 }
    111 
    112 void RenderSVGForeignObject::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
    113 {
    114     // FIXME: Investigate in size rounding issues
    115     // FIXME: Remove unnecessary rounding when layout is off ints: webkit.org/b/63656
    116     // FIXME: Is this correct for vertical writing mode?
    117     computedValues.m_extent = static_cast<int>(roundf(m_viewport.height()));
    118     computedValues.m_position = logicalTop;
    119 }
    120 
    121 void RenderSVGForeignObject::layout()
    122 {
    123     ASSERT(needsLayout());
    124     ASSERT(!view()->layoutStateEnabled()); // RenderSVGRoot disables layoutState for the SVG rendering tree.
    125 
    126     LayoutRectRecorder recorder(*this);
    127     LayoutRepainter repainter(*this, SVGRenderSupport::checkForSVGRepaintDuringLayout(this));
    128     SVGForeignObjectElement* foreign = toSVGForeignObjectElement(node());
    129 
    130     bool updateCachedBoundariesInParents = false;
    131     if (m_needsTransformUpdate) {
    132         m_localTransform = foreign->animatedLocalTransform();
    133         m_needsTransformUpdate = false;
    134         updateCachedBoundariesInParents = true;
    135     }
    136 
    137     FloatRect oldViewport = m_viewport;
    138 
    139     // Cache viewport boundaries
    140     SVGLengthContext lengthContext(foreign);
    141     FloatPoint viewportLocation(foreign->xCurrentValue().value(lengthContext), foreign->yCurrentValue().value(lengthContext));
    142     m_viewport = FloatRect(viewportLocation, FloatSize(foreign->widthCurrentValue().value(lengthContext), foreign->heightCurrentValue().value(lengthContext)));
    143     if (!updateCachedBoundariesInParents)
    144         updateCachedBoundariesInParents = oldViewport != m_viewport;
    145 
    146     // Set box origin to the foreignObject x/y translation, so positioned objects in XHTML content get correct
    147     // positions. A regular RenderBoxModelObject would pull this information from RenderStyle - in SVG those
    148     // properties are ignored for non <svg> elements, so we mimic what happens when specifying them through CSS.
    149 
    150     // FIXME: Investigate in location rounding issues - only affects RenderSVGForeignObject & RenderSVGText
    151     setLocation(roundedIntPoint(viewportLocation));
    152 
    153     bool layoutChanged = everHadLayout() && selfNeedsLayout();
    154     RenderBlock::layout();
    155     ASSERT(!needsLayout());
    156 
    157     // If our bounds changed, notify the parents.
    158     if (updateCachedBoundariesInParents)
    159         RenderSVGBlock::setNeedsBoundariesUpdate();
    160 
    161     // Invalidate all resources of this client if our layout changed.
    162     if (layoutChanged)
    163         SVGResourcesCache::clientLayoutChanged(this);
    164 
    165     repainter.repaintAfterLayout();
    166 }
    167 
    168 bool RenderSVGForeignObject::nodeAtFloatPoint(const HitTestRequest& request, HitTestResult& result, const FloatPoint& pointInParent, HitTestAction hitTestAction)
    169 {
    170     // Embedded content is drawn in the foreground phase.
    171     if (hitTestAction != HitTestForeground)
    172         return false;
    173 
    174     FloatPoint localPoint = localTransform().inverse().mapPoint(pointInParent);
    175 
    176     // Early exit if local point is not contained in clipped viewport area
    177     if (SVGRenderSupport::isOverflowHidden(this) && !m_viewport.contains(localPoint))
    178         return false;
    179 
    180     // FOs establish a stacking context, so we need to hit-test all layers.
    181     HitTestLocation hitTestLocation(roundedLayoutPoint(localPoint));
    182     return RenderBlock::nodeAtPoint(request, result, hitTestLocation, LayoutPoint(), HitTestForeground)
    183         || RenderBlock::nodeAtPoint(request, result, hitTestLocation, LayoutPoint(), HitTestFloat)
    184         || RenderBlock::nodeAtPoint(request, result, hitTestLocation, LayoutPoint(), HitTestChildBlockBackgrounds);
    185 }
    186 
    187 bool RenderSVGForeignObject::nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction)
    188 {
    189     ASSERT_NOT_REACHED();
    190     return false;
    191 }
    192 
    193 void RenderSVGForeignObject::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags, bool* wasFixed) const
    194 {
    195     SVGRenderSupport::mapLocalToContainer(this, repaintContainer, transformState, wasFixed);
    196 }
    197 
    198 const RenderObject* RenderSVGForeignObject::pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap& geometryMap) const
    199 {
    200     return SVGRenderSupport::pushMappingToContainer(this, ancestorToStopAt, geometryMap);
    201 }
    202 
    203 }
    204