RenderBox::applyVisualEffectOverflow() and RenderBox::outlineBoundsFo…

…rRepaint() use different ways of computing outline/shadow extent https://bugs.webkit.org/show_bug.cgi?id=264625 rdar://118582062 Reviewed by Alan Baradlay. The logic in `ShadowData::adjustRectForShadow()` to compute the impact of box-shadow and outline on a rect was wrong; the outline is not shadowed, so outline and shadow have independent effects on the repaint rect. The correct implementation is to just compute their effects separately, and take the union of the result, which is what `RenderBox::applyVisualEffectOverflow()` already does. So remove the outline argument from `ShadowData::adjustRectForShadow()` and delete `RenderObject::adjustRectForOutlineAndShadow()`. `RenderBox::outlineBoundsForRepaint()` now just calls `applyVisualEffectOverflow()`, and LegacyRenderSVGModelObject gets its own copy of the old code because it's not clear how shadows and outlines interact in SVG. There was also code duplication between `RenderStyle::shadowExtent()` and code in ShadowData, so remove the RenderStyle code and have it call into ShadowData. * LayoutTests/fast/box-shadow/negative-shadow-box-expand-expected.txt: * LayoutTests/fast/box-shadow/negative-shadow-box-shrink-expected.txt: * LayoutTests/fast/repaint/outline-and-shadow-repaint-expected.txt: Added. * LayoutTests/fast/repaint/outline-and-shadow-repaint.html: Added. * LayoutTests/platform/gtk/fast/repaint/4776765-expected.txt: * LayoutTests/platform/mac-monterey-wk2/fast/repaint/4776765-expected.txt: * LayoutTests/platform/mac-ventura-wk2/fast/repaint/4776765-expected.txt: * LayoutTests/platform/mac-wk1/fast/repaint/4776765-expected.txt: * LayoutTests/platform/mac/fast/repaint/4776765-expected.txt: * Source/WebCore/display/css/DisplayBoxModelBox.cpp: (WebCore::Display::BoxModelBox::absolutePaintingExtent const): * Source/WebCore/rendering/RenderBox.cpp: (WebCore::RenderBox::outlineBoundsForRepaint const): * Source/WebCore/rendering/RenderObject.cpp: (WebCore::RenderObject::adjustRectForOutlineAndShadow const): Deleted. * Source/WebCore/rendering/RenderObject.h: * Source/WebCore/rendering/style/RenderStyle.cpp: (WebCore::RenderStyle::shadowExtent): Deleted. (WebCore::RenderStyle::shadowInsetExtent): Deleted. * Source/WebCore/rendering/style/RenderStyle.h: * Source/WebCore/rendering/style/RenderStyleInlines.h: (WebCore::RenderStyle::boxShadowExtent const): (WebCore::RenderStyle::boxShadowInsetExtent const): (WebCore::RenderStyle::textShadowExtent const): * Source/WebCore/rendering/style/ShadowData.cpp: (WebCore::ShadowData::shadowOutsetExtent const): (WebCore::ShadowData::shadowInsetExtent const): (WebCore::ShadowData::adjustRectForShadow const): (WebCore::calculateShadowExtent): Deleted. * Source/WebCore/rendering/style/ShadowData.h: (WebCore::ShadowData::shadowOutsetExtent): (WebCore::ShadowData::shadowInsetExtent): * Source/WebCore/rendering/svg/legacy/LegacyRenderSVGModelObject.cpp: (WebCore::adjustRectForOutlineAndShadow): (WebCore::LegacyRenderSVGModelObject::outlineBoundsForRepaint const): Canonical link: https://commits.webkit.org/271254@main
WebKit · Nov 29, 2023 · 6aa1f67 · 6aa1f67
1 parent 47696ba
commit 6aa1f67
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Showing 19 changed files with 147 additions and 104 deletions.
diff --git a/LayoutTests/fast/box-shadow/negative-shadow-box-expand-expected.txt b/LayoutTests/fast/box-shadow/negative-shadow-box-expand-expected.txt
@@ -1,7 +1,7 @@
 (repaint rects
   (rect 100 200 600 100)
   (rect 100 200 640 100)
-  (rect 100 160 640 40)
+  (rect 100 160 600 40)
   (rect 100 200 640 100)
   (rect 0 300 800 100)
 )

diff --git a/LayoutTests/fast/box-shadow/negative-shadow-box-shrink-expected.txt b/LayoutTests/fast/box-shadow/negative-shadow-box-shrink-expected.txt
@@ -1,7 +1,7 @@
 (repaint rects
   (rect 100 200 600 100)
   (rect 100 200 640 100)
-  (rect 100 160 640 40)
+  (rect 100 160 600 40)
   (rect 100 200 640 100)
   (rect 0 300 800 100)
 )

diff --git a/LayoutTests/fast/repaint/outline-and-shadow-repaint-expected.txt b/LayoutTests/fast/repaint/outline-and-shadow-repaint-expected.txt
@@ -0,0 +1,7 @@
+(repaint rects
+  (rect 88 80 388 390)
+  (rect 8 370 784 100)
+  (rect 8 304 784 66)
+  (rect 0 404 800 100)
+)
+
diff --git a/LayoutTests/fast/repaint/outline-and-shadow-repaint.html b/LayoutTests/fast/repaint/outline-and-shadow-repaint.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <style>
+        .box {
+            width: 300px;
+            height: 300px;
+            margin: 100px;
+            border: 2px solid black;
+            outline: 20px solid rgba(0, 128, 0, 0.5);
+            box-shadow: 30px 32px 10px 20px black;
+        }
+
+        body.changed .box {
+            height: 200px;
+        }
+    </style>
+    <script src="resources/text-based-repaint.js"></script>
+    <script>
+        function repaintTest()
+        {
+            document.body.classList.add('changed');
+        }
+
+        window.addEventListener('load', runRepaintTest, false);
+    </script>
+</head>
+<body>
+    <div class="box"></div>
+</body>
+</html>
diff --git a/LayoutTests/platform/gtk/fast/repaint/4776765-expected.txt b/LayoutTests/platform/gtk/fast/repaint/4776765-expected.txt
@@ -7,7 +7,7 @@
   (rect 1 37 798 32)
   (rect 8 44 784 18)
   (rect 1 51 798 18)
-  (rect 1 44 798 7)
+  (rect 8 37 784 14)
   (rect 1 19 15 31)
   (rect 8 26 1 17)
   (rect 1 37 15 31)

diff --git a/LayoutTests/platform/mac-monterey-wk2/fast/repaint/4776765-expected.txt b/LayoutTests/platform/mac-monterey-wk2/fast/repaint/4776765-expected.txt
@@ -7,7 +7,7 @@
   (rect 1 37 798 32)
   (rect 8 44 784 18)
   (rect 1 51 798 18)
-  (rect 1 44 798 7)
+  (rect 8 37 784 14)
   (rect 1 19 15 32)
   (rect 8 26 1 18)
   (rect 1 37 15 32)

diff --git a/LayoutTests/platform/mac-ventura-wk2/fast/repaint/4776765-expected.txt b/LayoutTests/platform/mac-ventura-wk2/fast/repaint/4776765-expected.txt
@@ -7,7 +7,7 @@
   (rect 1 37 798 32)
   (rect 8 44 784 18)
   (rect 1 51 798 18)
-  (rect 1 44 798 7)
+  (rect 8 37 784 14)
   (rect 1 19 15 32)
   (rect 8 26 1 18)
   (rect 1 37 15 32)

diff --git a/LayoutTests/platform/mac-wk1/fast/repaint/4776765-expected.txt b/LayoutTests/platform/mac-wk1/fast/repaint/4776765-expected.txt
@@ -7,6 +7,6 @@
   (rect 1 37 798 32)
   (rect 8 44 784 18)
   (rect 1 51 798 18)
-  (rect 1 44 798 7)
+  (rect 8 37 784 14)
 )
 
diff --git a/LayoutTests/platform/mac/fast/repaint/4776765-expected.txt b/LayoutTests/platform/mac/fast/repaint/4776765-expected.txt
@@ -7,7 +7,7 @@
   (rect 1 37 798 32)
   (rect 8 44 784 18)
   (rect 1 51 798 18)
-  (rect 1 44 798 7)
+  (rect 8 37 784 14)
   (rect 1 19 16 32)
   (rect 8 26 2 18)
   (rect 1 37 16 32)

diff --git a/Source/WebCore/display/css/DisplayBoxModelBox.cpp b/Source/WebCore/display/css/DisplayBoxModelBox.cpp
@@ -122,7 +122,7 @@ UnadjustedAbsoluteFloatRect BoxModelBox::absolutePaintingExtent() const
     auto paintingExtent = absoluteBorderBoxRect();
 
     if (auto* shadow = style().boxShadow())
-        shadow->adjustRectForShadow(paintingExtent, 0);
+        shadow->adjustRectForShadow(paintingExtent);
 
     return paintingExtent;
 }

diff --git a/Source/WebCore/rendering/RenderBox.cpp b/Source/WebCore/rendering/RenderBox.cpp
@@ -851,8 +851,8 @@ FloatQuad RenderBox::absoluteContentQuad() const
 
 LayoutRect RenderBox::outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap) const
 {
-    LayoutRect box = borderBoundingBox();
-    adjustRectForOutlineAndShadow(box);
+    auto box = borderBoundingBox();
+    applyVisualEffectOverflow(box);
 
     if (repaintContainer != this) {
         FloatQuad containerRelativeQuad;

diff --git a/Source/WebCore/rendering/RenderObject.cpp b/Source/WebCore/rendering/RenderObject.cpp
@@ -1902,16 +1902,6 @@ int RenderObject::nextOffset(int current) const
     return current + 1;
 }
 
-void RenderObject::adjustRectForOutlineAndShadow(LayoutRect& rect) const
-{
-    LayoutUnit outlineSize { outlineStyleForRepaint().outlineSize() };
-    if (const ShadowData* boxShadow = style().boxShadow()) {
-        boxShadow->adjustRectForShadow(rect, outlineSize);
-        return;
-    }
-    rect.inflate(outlineSize);
-}
-
 void RenderObject::imageChanged(CachedImage* image, const IntRect* rect)
 {
     imageChanged(static_cast<WrappedImagePtr>(image), rect);

diff --git a/Source/WebCore/rendering/RenderObject.h b/Source/WebCore/rendering/RenderObject.h
@@ -952,8 +952,6 @@ class RenderObject : public CachedImageClient, public CanMakeCheckedPtr {
     //////////////////////////////////////////
     Node& nodeForNonAnonymous() const { ASSERT(!isAnonymous()); return m_node.get(); }
 
-    void adjustRectForOutlineAndShadow(LayoutRect&) const;
-
     virtual void willBeDestroyed();
 
     void setNeedsPositionedMovementLayoutBit(bool b) { m_bitfields.setNeedsPositionedMovementLayout(b); }

diff --git a/Source/WebCore/rendering/style/RenderStyle.cpp b/Source/WebCore/rendering/style/RenderStyle.cpp
@@ -2951,48 +2951,6 @@ void RenderStyle::setFontPalette(FontPalette value)
     fontCascade().update(selector);
 }
 
-LayoutBoxExtent RenderStyle::shadowExtent(const ShadowData* shadow)
-{
-    LayoutUnit top;
-    LayoutUnit right;
-    LayoutUnit bottom;
-    LayoutUnit left;
-
-    for ( ; shadow; shadow = shadow->next()) {
-        if (shadow->style() == ShadowStyle::Inset)
-            continue;
-
-        auto extentAndSpread = shadow->paintingExtent() + LayoutUnit(shadow->spread().value());
-        top = std::min<LayoutUnit>(top, LayoutUnit(shadow->y().value()) - extentAndSpread);
-        right = std::max<LayoutUnit>(right, LayoutUnit(shadow->x().value()) + extentAndSpread);
-        bottom = std::max<LayoutUnit>(bottom, LayoutUnit(shadow->y().value()) + extentAndSpread);
-        left = std::min<LayoutUnit>(left, LayoutUnit(shadow->x().value()) - extentAndSpread);
-    }
-
-    return { top, right, bottom, left };
-}
-
-LayoutBoxExtent RenderStyle::shadowInsetExtent(const ShadowData* shadow)
-{
-    LayoutUnit top;
-    LayoutUnit right;
-    LayoutUnit bottom;
-    LayoutUnit left;
-
-    for ( ; shadow; shadow = shadow->next()) {
-        if (shadow->style() == ShadowStyle::Normal)
-            continue;
-
-        auto extentAndSpread = shadow->paintingExtent() + LayoutUnit(shadow->spread().value());
-        top = std::max<LayoutUnit>(top, LayoutUnit(shadow->y().value()) + extentAndSpread);
-        right = std::min<LayoutUnit>(right, LayoutUnit(shadow->x().value()) - extentAndSpread);
-        bottom = std::min<LayoutUnit>(bottom, LayoutUnit(shadow->y().value()) - extentAndSpread);
-        left = std::max<LayoutUnit>(left, LayoutUnit(shadow->x().value()) + extentAndSpread);
-    }
-
-    return { top, right, bottom, left };
-}
-
 void RenderStyle::getShadowHorizontalExtent(const ShadowData* shadow, LayoutUnit &left, LayoutUnit &right)
 {
     left = 0;

diff --git a/Source/WebCore/rendering/style/RenderStyle.h b/Source/WebCore/rendering/style/RenderStyle.h
@@ -2250,8 +2250,6 @@ class RenderStyle {
     static constexpr bool isDisplayListItemType(DisplayType);
     static constexpr bool isDisplayTableOrTablePart(DisplayType);
 
-    static LayoutBoxExtent shadowExtent(const ShadowData*);
-    static LayoutBoxExtent shadowInsetExtent(const ShadowData*);
     static void getShadowHorizontalExtent(const ShadowData*, LayoutUnit& left, LayoutUnit& right);
     static void getShadowVerticalExtent(const ShadowData*, LayoutUnit& top, LayoutUnit& bottom);
 

diff --git a/Source/WebCore/rendering/style/RenderStyleInlines.h b/Source/WebCore/rendering/style/RenderStyleInlines.h
@@ -33,6 +33,7 @@
 #include "RenderStyle.h"
 #include "ScrollTypes.h"
 #include "ScrollbarColor.h"
+#include "ShadowData.h"
 #include "StyleAppearance.h"
 #include "StyleBackgroundData.h"
 #include "StyleBoxData.h"
@@ -139,8 +140,8 @@ inline BoxOrient RenderStyle::boxOrient() const { return static_cast<BoxOrient>(
 inline BoxPack RenderStyle::boxPack() const { return static_cast<BoxPack>(m_nonInheritedData->miscData->deprecatedFlexibleBox->pack); }
 inline StyleReflection* RenderStyle::boxReflect() const { return m_nonInheritedData->rareData->boxReflect.get(); }
 inline const ShadowData* RenderStyle::boxShadow() const { return m_nonInheritedData->miscData->boxShadow.get(); }
-inline LayoutBoxExtent RenderStyle::boxShadowExtent() const { return shadowExtent(boxShadow()); }
-inline LayoutBoxExtent RenderStyle::boxShadowInsetExtent() const { return shadowInsetExtent(boxShadow()); }
+inline LayoutBoxExtent RenderStyle::boxShadowExtent() const { return ShadowData::shadowOutsetExtent(boxShadow()); }
+inline LayoutBoxExtent RenderStyle::boxShadowInsetExtent() const { return ShadowData::shadowInsetExtent(boxShadow()); }
 inline BoxSizing RenderStyle::boxSizing() const { return m_nonInheritedData->boxData->boxSizing(); }
 inline BoxSizing RenderStyle::boxSizingForAspectRatio() const { return aspectRatioType() == AspectRatioType::AutoAndRatio ? BoxSizing::ContentBox : boxSizing(); }
 inline BreakBetween RenderStyle::breakAfter() const { return static_cast<BreakBetween>(m_nonInheritedData->rareData->breakAfter); }
@@ -684,7 +685,7 @@ inline TextOrientation RenderStyle::textOrientation() const { return static_cast
 inline TextOverflow RenderStyle::textOverflow() const { return static_cast<TextOverflow>(m_nonInheritedData->miscData->textOverflow); }
 inline TextSecurity RenderStyle::textSecurity() const { return static_cast<TextSecurity>(m_rareInheritedData->textSecurity); }
 inline const ShadowData* RenderStyle::textShadow() const { return m_rareInheritedData->textShadow.get(); }
-inline LayoutBoxExtent RenderStyle::textShadowExtent() const { return shadowExtent(textShadow()); }
+inline LayoutBoxExtent RenderStyle::textShadowExtent() const { return ShadowData::shadowOutsetExtent(textShadow()); }
 inline const StyleColor& RenderStyle::textStrokeColor() const { return m_rareInheritedData->textStrokeColor; }
 inline float RenderStyle::textStrokeWidth() const { return m_rareInheritedData->textStrokeWidth; }
 inline OptionSet<TextTransform> RenderStyle::textTransform() const { return OptionSet<TextTransform>::fromRaw(m_inheritedFlags.textTransform); }

diff --git a/Source/WebCore/rendering/style/ShadowData.cpp b/Source/WebCore/rendering/style/ShadowData.cpp
@@ -78,45 +78,64 @@ bool ShadowData::operator==(const ShadowData& o) const
     return true;
 }
 
-static inline void calculateShadowExtent(const ShadowData* shadow, LayoutUnit additionalOutlineSize, LayoutUnit& shadowLeft, LayoutUnit& shadowRight, LayoutUnit& shadowTop, LayoutUnit& shadowBottom)
+LayoutBoxExtent ShadowData::shadowOutsetExtent() const
 {
-    do {
-        LayoutUnit extentAndSpread = shadow->paintingExtent() + LayoutUnit(shadow->spread().value()) + additionalOutlineSize;
-        if (shadow->style() == ShadowStyle::Normal) {
-            shadowLeft = std::min(LayoutUnit(shadow->x().value()) - extentAndSpread, shadowLeft);
-            shadowRight = std::max(LayoutUnit(shadow->x().value()) + extentAndSpread, shadowRight);
-            shadowTop = std::min(LayoutUnit(shadow->y().value()) - extentAndSpread, shadowTop);
-            shadowBottom = std::max(LayoutUnit(shadow->y().value()) + extentAndSpread, shadowBottom);
-        }
-
-        shadow = shadow->next();
-    } while (shadow);
+    LayoutUnit top;
+    LayoutUnit right;
+    LayoutUnit bottom;
+    LayoutUnit left;
+
+    for (auto* shadow = this; shadow; shadow = shadow->next()) {
+        auto extentAndSpread = shadow->paintingExtent() + LayoutUnit(shadow->spread().value());
+        if (shadow->style() == ShadowStyle::Inset)
+            continue;
+
+        left = std::min(LayoutUnit(shadow->x().value()) - extentAndSpread, left);
+        right = std::max(LayoutUnit(shadow->x().value()) + extentAndSpread, right);
+        top = std::min(LayoutUnit(shadow->y().value()) - extentAndSpread, top);
+        bottom = std::max(LayoutUnit(shadow->y().value()) + extentAndSpread, bottom);
+    }
+
+    return { top, right, bottom, left };
 }
 
-void ShadowData::adjustRectForShadow(LayoutRect& rect, int additionalOutlineSize) const
+LayoutBoxExtent ShadowData::shadowInsetExtent() const
 {
-    LayoutUnit shadowLeft;
-    LayoutUnit shadowRight;
-    LayoutUnit shadowTop;
-    LayoutUnit shadowBottom;
-    calculateShadowExtent(this, additionalOutlineSize, shadowLeft, shadowRight, shadowTop, shadowBottom);
-
-    rect.move(shadowLeft, shadowTop);
-    rect.setWidth(rect.width() - shadowLeft + shadowRight);
-    rect.setHeight(rect.height() - shadowTop + shadowBottom);
+    LayoutUnit top;
+    LayoutUnit right;
+    LayoutUnit bottom;
+    LayoutUnit left;
+
+    for (auto* shadow = this; shadow; shadow = shadow->next()) {
+        if (shadow->style() == ShadowStyle::Normal)
+            continue;
+
+        auto extentAndSpread = shadow->paintingExtent() + LayoutUnit(shadow->spread().value());
+        top = std::max<LayoutUnit>(top, LayoutUnit(shadow->y().value()) + extentAndSpread);
+        right = std::min<LayoutUnit>(right, LayoutUnit(shadow->x().value()) - extentAndSpread);
+        bottom = std::min<LayoutUnit>(bottom, LayoutUnit(shadow->y().value()) - extentAndSpread);
+        left = std::max<LayoutUnit>(left, LayoutUnit(shadow->x().value()) + extentAndSpread);
+    }
+
+    return { top, right, bottom, left };
 }
 
-void ShadowData::adjustRectForShadow(FloatRect& rect, int additionalOutlineSize) const
+void ShadowData::adjustRectForShadow(LayoutRect& rect) const
 {
-    LayoutUnit shadowLeft = 0;
-    LayoutUnit shadowRight = 0;
-    LayoutUnit shadowTop = 0;
-    LayoutUnit shadowBottom = 0;
-    calculateShadowExtent(this, additionalOutlineSize, shadowLeft, shadowRight, shadowTop, shadowBottom);
-
-    rect.move(shadowLeft, shadowTop);
-    rect.setWidth(rect.width() - shadowLeft + shadowRight);
-    rect.setHeight(rect.height() - shadowTop + shadowBottom);
+    auto shadowExtent = shadowOutsetExtent();
+
+    rect.move(shadowExtent.left(), shadowExtent.top());
+    rect.setWidth(rect.width() - shadowExtent.left() + shadowExtent.right());
+    rect.setHeight(rect.height() - shadowExtent.top() + shadowExtent.bottom());
+}
+
+void ShadowData::adjustRectForShadow(FloatRect& rect) const
+{
+    auto shadowExtent = shadowOutsetExtent();
+
+    rect.move(shadowExtent.left(), shadowExtent.top());
+    rect.setWidth(rect.width() - shadowExtent.left() + shadowExtent.right());
+    rect.setHeight(rect.height() - shadowExtent.top() + shadowExtent.bottom());
 }
 
 TextStream& operator<<(TextStream& ts, const ShadowData& data)

diff --git a/Source/WebCore/rendering/style/ShadowData.h b/Source/WebCore/rendering/style/ShadowData.h
@@ -27,6 +27,7 @@
 #include "FloatRect.h"
 #include "LayoutRect.h"
 #include "Length.h"
+#include "LengthBox.h"
 #include "LengthPoint.h"
 #include "StyleColor.h"
 
@@ -64,6 +65,7 @@ class ShadowData {
     const Length& y() const { return m_location.y(); }
     const LengthPoint& location() const { return m_location; }
     const Length& radius() const { return m_radius; }
+
     LayoutUnit paintingExtent() const
     {
         // Blurring uses a Gaussian function whose std. deviation is m_radius/2, and which in theory
@@ -72,7 +74,9 @@ class ShadowData {
         const float radiusExtentMultiplier = 1.4;
         return LayoutUnit(ceilf(m_radius.value() * radiusExtentMultiplier));
     }
+
     const Length& spread() const { return m_spread; }
+
     ShadowStyle style() const { return m_style; }
 
     void setColor(const StyleColor& color) { m_color = color; }
@@ -83,8 +87,14 @@ class ShadowData {
     const ShadowData* next() const { return m_next.get(); }
     void setNext(std::unique_ptr<ShadowData>&& shadow) { m_next = WTFMove(shadow); }
 
-    void adjustRectForShadow(LayoutRect&, int additionalOutlineSize = 0) const;
-    void adjustRectForShadow(FloatRect&, int additionalOutlineSize = 0) const;
+    void adjustRectForShadow(LayoutRect&) const;
+    void adjustRectForShadow(FloatRect&) const;
+
+    LayoutBoxExtent shadowOutsetExtent() const;
+    LayoutBoxExtent shadowInsetExtent() const;
+
+    static LayoutBoxExtent shadowOutsetExtent(const ShadowData*);
+    static LayoutBoxExtent shadowInsetExtent(const ShadowData*);
 
 private:
     void deleteNextLinkedListWithoutRecursion();
@@ -104,6 +114,23 @@ inline ShadowData::~ShadowData()
         deleteNextLinkedListWithoutRecursion();
 }
 
+
+inline LayoutBoxExtent ShadowData::shadowOutsetExtent(const ShadowData* shadow)
+{
+    if (!shadow)
+        return { };
+
+    return shadow->shadowOutsetExtent();
+}
+
+inline LayoutBoxExtent ShadowData::shadowInsetExtent(const ShadowData* shadow)
+{
+    if (!shadow)
+        return { };
+
+    return shadow->shadowInsetExtent();
+}
+
 WTF::TextStream& operator<<(WTF::TextStream&, const ShadowData&);
 
 } // namespace WebCore