Merge branch '4.7' of scm.dev.nokia.troll.no:qt/qt into lighthouse

29 files changed, 969 insertions, 308 deletions

diff --git a/src/3rdparty/webkit/WebCore/ChangeLog b/src/3rdparty/webkit/WebCore/ChangeLog
index c17a8aa8a1..687b76bee7 100644
--- a/src/3rdparty/webkit/WebCore/ChangeLog
+++ b/src/3rdparty/webkit/WebCore/ChangeLog
@@ -1,3 +1,362 @@
+2010-06-22  Simon Hausmann  <simon.hausmann@nokia.com>
+
+        Unreviewed Qt/Symbian build fix.
+
+        Fix "make clean" to not try to execute clean commands for
+        the extra targets we use to simulate "make install".
+
+        * WebCore.pro: Use no_clean in CONFIG of extra compilers.
+
+2010-06-21  Balazs Kelemen  <kb@inf.u-szeged.hu>
+
+        Reviewed by Simon Hausmann.
+
+        [Qt] Avoid unnecessary image conversion in RGBA32Buffer::zeroFill()
+        https://bugs.webkit.org/show_bug.cgi?id=40910
+
+        * platform/image-decoders/qt/RGBA32BufferQt.cpp:
+        (WebCore::RGBA32Buffer::zeroFill):
+
+2010-05-31  Jocelyn Turcotte  <jocelyn.turcotte@nokia.com>
+
+        Reviewed by Simon Hausmann.
+
+        [Qt] Implement the simple text code path.
+        https://bugs.webkit.org/show_bug.cgi?id=40077
+
+        Remove the FONT_FAST_PATH macro and use the Qt's
+        fast text implementation instead of the one of WebKit.
+
+        The Qt::TextBypassShaping flag is used to tell Qt to
+        only use the glyph advances.
+
+        Qt 4.7 is needed to get this flag thus the complex path is always
+        used if QtWebKit is compiled against an earlier version.
+
+        Contrary to the WebKit's implementation, the complex code path
+        is taken if the text is RightToLeft, justified or is formatted
+        with non-zero letter or word spacing.
+
+        * platform/graphics/Font.cpp:
+        (WebCore::Font::drawText):
+        (WebCore::Font::floatWidth):
+        (WebCore::Font::selectionRectForText):
+        (WebCore::Font::offsetForPosition):
+        * platform/graphics/Font.h:
+        (WebCore::Font::isRoundingHackCharacter):
+        * platform/graphics/qt/FontQt.cpp:
+        (WebCore::fromRawDataWithoutRef):
+        (WebCore::needComplexCodePath):
+        (WebCore::setupPlatformContext):
+        (WebCore::Font::canReturnFallbackFontsForComplexText):
+        (WebCore::Font::drawSimpleText):
+        (WebCore::Font::drawComplexText):
+        (WebCore::Font::floatWidthForSimpleText):
+        (WebCore::Font::offsetForPositionForSimpleText):
+        (WebCore::Font::selectionRectForSimpleText):
+
+2010-06-03  Jocelyn Turcotte  <jocelyn.turcotte@nokia.com>
+
+        Reviewed by Simon Hausmann.
+
+        Move the text code path detection code from FontFastPath.cpp to Font.cpp.
+        https://bugs.webkit.org/show_bug.cgi?id=40077
+
+        This is a patch preliminary to the implementation of the
+        simple font code path for the Qt port.
+
+        * platform/graphics/Font.cpp:
+        (WebCore::Font::setCodePath):
+        (WebCore::Font::codePath):
+        * platform/graphics/Font.h:
+        * platform/graphics/FontFastPath.cpp:
+
+2010-04-30  Dan Bernstein  <mitz@apple.com>
+
+        Reviewed by Adele Peterson.
+
+        Part of <rdar://problem/6649734> Text repainting does not account for glyphs which draw outside the typographic bounds of the font
+        https://bugs.webkit.org/show_bug.cgi?id=6274
+
+        Account for glyph overflow of characters in the range U+1E00..U+2000, but without sending them
+        through the complex text code path. Instead, introduce a variant of the fast path that tracks
+        glyph overflow.
+
+        * platform/graphics/Font.cpp:
+        (WebCore::Font::drawText): Use codePath().
+        (WebCore::Font::floatWidth): Use codePath(). Pass the GlyphOverflow pointer through to
+        floatWidthForSimpleText() if the code path is SimpleWithGlyphOverflow.
+        (WebCore::Font::selectionRectForText): Use codePath().
+        (WebCore::Font::offsetForPosition): Ditto.
+        * platform/graphics/Font.h: Replaced canUseGlyphCache() with codePath(). Added a GlyphOverflow
+        parameter to floatWidthForSimpleText().
+        * platform/graphics/FontFastPath.cpp:
+        Removed ROMAN_AND_GREEK_DIACRITICS_CAN_USE_GLYPH_CACHE.
+        (WebCore::Font::codePath): Renamed canUseGlyphCache() to this. Where it used to return false,
+        it now returns Complex. Where it used to return true, it now returns Simple, except for
+        the range U+1E00..U+2000, where it now returns SimpleWithGlyphOverflow.
+        (WebCore::Font::floatWidthForSimpleText): Added a GlyphOverflow parameter. If not 0, have the
+        width iterator account for glyph bounds, then update the GlyphOverflow accordingly.
+        * platform/graphics/WidthIterator.cpp:
+        (WebCore::WidthIterator::WidthIterator): Added boolean parameter telling the width iterator
+        whether to account for glyph bounds. Initialize m_accountForGlyphBounds accordingly. Initialize
+        m_maxGlyphBoundingBoxY, m_minGlyphBoundingBoxY, m_firstGlyphOverflow and m_lastGlyphOverflow.
+        (WebCore::WidthIterator::advance): If accounting for glyph bounds, update the above member variables.
+        * platform/graphics/WidthIterator.h:
+        (WebCore::WidthIterator::maxGlyphBoundingBoxY): Added this accessor.
+        (WebCore::WidthIterator::minGlyphBoundingBoxY): Ditto.
+        (WebCore::WidthIterator::firstGlyphOverflow): Ditto.
+        (WebCore::WidthIterator::lastGlyphOverflow): Ditto.
+
+2010-04-21  Ojan Vafai  <ojan@chromium.org>
+
+        Reviewed by Adele Peterson.
+
+        http://trac.webkit.org/changeset/57215 caused perf/memory regressions
+        https://bugs.webkit.org/show_bug.cgi?id=37292
+
+        #if out the canUseGlyphCache Changes from r57215 as they caused a 
+        8% perf regression on Chromium's international page load tests so that
+        the perf regression can be fixed properly without being left in the tree.
+
+        * platform/graphics/FontFastPath.cpp:
+        (WebCore::Font::canUseGlyphCache):
+
+2010-04-07  Enrica Casucci  <enrica@apple.com>
+
+        Reviewed by Dave Hyatt.
+
+        Text repainting does not account for glyphs which draw outside the typographic bounds of the font (6274).
+        <rdar://problem/6649734>
+        <https://bugs.webkit.org/show_bug.cgi?id=6274>
+        
+        In order to be able to handle successfully this case, it is necessary to change the glyph width cache to store
+        the bounding box for the glyph instead of the simply caching the glyph width.
+        Retrieving the bounding box for the glyph is expensive, therefore we do it only
+        when we are rendering text using the complex text path to minimize the performance impact.
+        To support characters with stacked diacritics, the method canUseGlyphCache has been modified to
+        return false for the range of characters with stacked diacritics.
+        The glyph cache has been also updated to allow storing the glyph bounding box together with the
+        horizontal width. The bounding box is populated only for complex text.
+        
+        The original version of this patch has been written by Dan Bernstein.
+
+        Test: fast/repaint/stacked-diacritics.html
+
+        * Android.mk: File name change.
+        * GNUmakefile.am: File name change.
+        * WebCore.base.exp: Added parameter in exported function.
+        * WebCore.gypi: File name change.
+        * WebCore.vcproj/WebCore.vcproj: File name change.
+        * WebCore.xcodeproj/project.pbxproj: File name change.
+        * platform/graphics/Font.cpp:
+        (WebCore::Font::floatWidth): Added glyphOverflow parameter.
+        * platform/graphics/Font.h:
+        (WebCore::GlyphOverflow::GlyphOverflow): Added.
+        (WebCore::Font::width): Added glyphOverflow parameter.
+        * platform/graphics/FontFastPath.cpp:
+        (WebCore::Font::canUseGlyphCache): Modified to render characters with stacked diacritics with complex text path.
+        * platform/graphics/GlyphMetricsMap.cpp: Copied from WebCore/platform/graphics/GlyphWidthMap.cpp.
+        (WebCore::GlyphMetricsMap::locatePageSlowCase): Class name changed to reflect new semantics.
+        * platform/graphics/GlyphMetricsMap.h: Copied from WebCore/platform/graphics/GlyphWidthMap.h.
+        (WebCore::GlyphMetricsMap::GlyphMetricsMap):
+        (WebCore::GlyphMetricsMap::~GlyphMetricsMap):
+        (WebCore::GlyphMetricsMap::metricsForGlyph):
+        (WebCore::GlyphMetricsMap::widthForGlyph):
+        (WebCore::GlyphMetricsMap::setMetricsForGlyph):
+        (WebCore::GlyphMetricsMap::GlyphMetricsPage::metricsForGlyph):
+        (WebCore::GlyphMetricsMap::GlyphMetricsPage::setMetricsForGlyph):
+        (WebCore::GlyphMetricsMap::GlyphMetricsPage::setMetricsForIndex):
+        (WebCore::GlyphMetricsMap::locatePage):
+        * platform/graphics/GlyphWidthMap.cpp: Removed.
+        * platform/graphics/GlyphWidthMap.h: Removed.
+        * platform/graphics/SimpleFontData.cpp:
+        (WebCore::SimpleFontData::platformGlyphInit):
+        * platform/graphics/SimpleFontData.h:
+        (WebCore::):
+        (WebCore::SimpleFontData::widthForGlyph):
+        (WebCore::SimpleFontData::metricsForGlyph):
+        * platform/graphics/cairo/SimpleFontDataCairo.cpp:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * platform/graphics/chromium/FontChromiumWin.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added parameter.
+        * platform/graphics/chromium/FontLinux.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added parameter.
+        * platform/graphics/chromium/SimpleFontDataChromiumWin.cpp:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * platform/graphics/chromium/SimpleFontDataLinux.cpp:
+        (WebCore::SimpleFontData::platformWidthForGlyph): Name and signature vachange
+        * platform/graphics/efl/FontEfl.cpp:
+        (WebCore::Font::floatWidthForComplexText): Name and signature change.
+        * platform/graphics/gtk/SimpleFontDataPango.cpp:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * platform/graphics/haiku/FontHaiku.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added parameter.
+        * platform/graphics/haiku/SimpleFontDataHaiku.cpp:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * platform/graphics/mac/ComplexTextController.cpp:
+        (WebCore::ComplexTextController::ComplexTextController):
+        (WebCore::ComplexTextController::adjustGlyphsAndAdvances):
+        * platform/graphics/mac/ComplexTextController.h:
+        (WebCore::ComplexTextController::minGlyphBoundingBoxX):
+        (WebCore::ComplexTextController::maxGlyphBoundingBoxX):
+        (WebCore::ComplexTextController::minGlyphBoundingBoxY):
+        (WebCore::ComplexTextController::maxGlyphBoundingBoxY):
+        * platform/graphics/mac/FontComplexTextMac.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added paramter.
+        * platform/graphics/mac/SimpleFontDataMac.mm:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * platform/graphics/qt/FontQt.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added paramter.
+        * platform/graphics/win/FontWin.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added parameter.
+        * platform/graphics/win/SimpleFontDataCGWin.cpp:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * platform/graphics/win/SimpleFontDataWin.cpp:
+        (WebCore::SimpleFontData::metricsForGDIGlyph):
+        * platform/graphics/win/UniscribeController.cpp:
+        (WebCore::UniscribeController::UniscribeController):
+        (WebCore::UniscribeController::shapeAndPlaceItem):
+        * platform/graphics/win/UniscribeController.h:
+        (WebCore::UniscribeController::minGlyphBoundingBoxX):
+        (WebCore::UniscribeController::maxGlyphBoundingBoxX):
+        (WebCore::UniscribeController::minGlyphBoundingBoxY):
+        (WebCore::UniscribeController::maxGlyphBoundingBoxY):
+        * platform/graphics/wince/FontWince.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added parameter.
+        * platform/graphics/wx/FontWx.cpp:
+        (WebCore::Font::floatWidthForComplexText): Added parameter.
+        * platform/graphics/wx/SimpleFontDataWx.cpp:
+        (WebCore::SimpleFontData::platformMetricsForGlyph): Name and signature change.
+        * rendering/InlineFlowBox.cpp:
+        (WebCore::InlineFlowBox::placeBoxesHorizontally):
+        (WebCore::InlineFlowBox::computeLogicalBoxHeights):
+        (WebCore::InlineFlowBox::computeVerticalOverflow):
+        * rendering/InlineTextBox.cpp:
+        (WebCore::InlineTextBox::setFallbackFonts):
+        (WebCore::InlineTextBox::fallbackFonts):
+        (WebCore::InlineTextBox::setGlyphOverflow):
+        (WebCore::InlineTextBox::glyphOverflow):
+        * rendering/InlineTextBox.h:
+        (WebCore::InlineTextBox::clearGlyphOverflowAndFallbackFontMap): Added.
+        * rendering/RenderBlockLineLayout.cpp:
+        (WebCore::RenderBlock::computeHorizontalPositionsForLine):
+        (WebCore::RenderBlock::layoutInlineChildren):
+        * rendering/RenderText.cpp:
+        (WebCore::RenderText::RenderText):
+        (WebCore::RenderText::styleDidChange):
+        (WebCore::RenderText::widthFromCache):
+        (WebCore::RenderText::trimmedPrefWidths):
+        (WebCore::RenderText::calcPrefWidths):
+        (WebCore::RenderText::setText):
+        (WebCore::RenderText::width):
+        * rendering/RenderText.h:
+
+2010-03-23  Evan Martin  <evan@chromium.org>
+
+        Reviewed by Dmitry Titov.
+
+        [chromium] use integral glyph widths
+        https://bugs.webkit.org/show_bug.cgi?id=36510
+
+        Despite WebKit (and Skia, to an extent) supporting non-integral
+        glyph widths, the font code path we hit in Skia only supports
+        integral glyph positions.  This means that we would accumulate
+        offsets when drawing a sequence up non-integer-width glyphs
+        which would cause gaps when snapped to the pixel grid when drawing.
+
+        * platform/graphics/chromium/SimpleFontDataLinux.cpp:
+        (WebCore::SimpleFontData::platformWidthForGlyph):
+        round glyph widths to integers.
+
+2010-06-21  Benjamin Poulain  <benjamin.poulain@nokia.com>
+
+        Reviewed by Kenneth Rohde Christiansen.
+
+        [Qt] Decode images directly to QPixmap
+        https://bugs.webkit.org/show_bug.cgi?id=40797
+
+        Decode images to QPixmap directly instead of QImage when possible.
+        RGBA32Buffer transforms the pixmap back to image if
+        necessary.
+
+        This improve the performance with certain graphic system, and
+        can reduce memory usage.
+
+        * platform/graphics/qt/ImageDecoderQt.cpp:
+        (WebCore::ImageDecoderQt::setData):
+        (WebCore::ImageDecoderQt::internalHandleCurrentImage):
+        * platform/image-decoders/ImageDecoder.h:
+        (WebCore::RGBA32Buffer::getAddr):
+        * platform/image-decoders/qt/RGBA32BufferQt.cpp:
+        (WebCore::RGBA32Buffer::clear):
+        (WebCore::RGBA32Buffer::zeroFill):
+        (WebCore::RGBA32Buffer::copyBitmapData):
+        (WebCore::RGBA32Buffer::setSize):
+        (WebCore::RGBA32Buffer::asNewNativeImage):
+        (WebCore::RGBA32Buffer::setPixmap):
+
+2010-06-17  Benjamin Poulain  <benjamin.poulain@nokia.com>
+
+        Reviewed by Simon Hausmann.
+
+        [Qt] Get rid of the the unused imageSize of ImageDecoderQt::internalHandleCurrentImage()
+        https://bugs.webkit.org/show_bug.cgi?id=40620
+
+        Remove an unused variable.
+
+        * platform/graphics/qt/ImageDecoderQt.cpp:
+        (WebCore::ImageDecoderQt::internalHandleCurrentImage):
+
+2010-06-18  Ananth Jasty  <ext-ananth.jasty@nokia.com>
+
+        Reviewed by Simon Hausmann.
+
+        [Qt] Text spacing miscalculation when using wordSpacing.
+        https://bugs.webkit.org/show_bug.cgi?id=40483
+
+        Removed wordSpacing compensation in FontQt whitespace width
+        calculation. The QFontMetrics::width() overload that takes
+        a character does not take QFont's word spacing into account.
+
+        * platform/graphics/qt/FontQt.cpp:
+        (WebCore::Font::floatWidthForComplexText):
+
+2010-06-13  Robert Hogan  <robert@webkit.org>
+
+        Reviewed by Kenneth Rohde Christiansen.
+
+        WebCore EventHandler needs to take account of onLoad events 
+        fired before layout() complete
+
+        https://bugs.webkit.org/show_bug.cgi?id=40102
+
+        WebCore 'cheats' by firing onLoad events before the frame's layout
+        has been performed. This can result in event listeners performing
+        operations that depend on the document's final layout, such as
+        scrolling operations.
+
+        When scrolling a frameview in eventhandler ensure the layout is complete.
+
+        * page/EventHandler.cpp:
+        (WebCore::EventHandler::scrollRecursively):
+
+2010-06-10  Raine Makelainen  <raine.makelainen@nokia.com>
+
+        Reviewed by Kenneth Rohde Christiansen.
+
+        Impossible to set input method hints based HTML5 input types
+        https://bugs.webkit.org/show_bug.cgi?id=40107
+
+        Helper methods for checking "tel", "number", "email",
+        and "url" input element types.
+
+        * html/HTMLInputElement.h:
+        (WebCore::HTMLInputElement::isTelephoneField):
+        (WebCore::HTMLInputElement::isNumberField):
+        (WebCore::HTMLInputElement::isEmailField):
+        (WebCore::HTMLInputElement::isUrlField):
+
 2010-06-17  Mark Brand  <mabrand@mabrand.nl>
 
         Reviewed by Simon Hausmann.
diff --git a/src/3rdparty/webkit/WebCore/WebCore.gypi b/src/3rdparty/webkit/WebCore/WebCore.gypi
index 94a6052b03..27b9085068 100644
--- a/src/3rdparty/webkit/WebCore/WebCore.gypi
+++ b/src/3rdparty/webkit/WebCore/WebCore.gypi
@@ -2320,8 +2320,8 @@
             'platform/graphics/GlyphBuffer.h',
             'platform/graphics/GlyphPageTreeNode.cpp',
             'platform/graphics/GlyphPageTreeNode.h',
-            'platform/graphics/GlyphWidthMap.cpp',
-            'platform/graphics/GlyphWidthMap.h',
+            'platform/graphics/GlyphMetricsMap.cpp',
+            'platform/graphics/GlyphMetricsMap.h',
             'platform/graphics/Gradient.cpp',
             'platform/graphics/Gradient.h',
             'platform/graphics/GraphicsContext.cpp',
diff --git a/src/3rdparty/webkit/WebCore/WebCore.pro b/src/3rdparty/webkit/WebCore/WebCore.pro
index 9870769b5d..fd2b4473e7 100644
--- a/src/3rdparty/webkit/WebCore/WebCore.pro
+++ b/src/3rdparty/webkit/WebCore/WebCore.pro
@@ -2867,6 +2867,7 @@ HEADERS += $$WEBKIT_API_HEADERS
         # INSTALLS is not implemented in qmake's s60 generators, copy headers manually
         inst_headers.commands = $$QMAKE_COPY ${QMAKE_FILE_NAME} ${QMAKE_FILE_OUT}
         inst_headers.input = WEBKIT_INSTALL_HEADERS
+        inst_headers.CONFIG = no_clean
 
         !isEmpty(INSTALL_HEADERS): inst_headers.output = $$INSTALL_HEADERS/QtWebKit/${QMAKE_FILE_BASE}${QMAKE_FILE_EXT}
         else: inst_headers.output = $$[QT_INSTALL_HEADERS]/QtWebKit/${QMAKE_FILE_BASE}${QMAKE_FILE_EXT}
@@ -2876,6 +2877,7 @@ HEADERS += $$WEBKIT_API_HEADERS
         inst_modfile.commands = $$inst_headers.commands
         inst_modfile.input = moduleFile
         inst_modfile.output = $$[QMAKE_MKSPECS]/modules
+        inst_modfile.CONFIG = no_clean
 
         QMAKE_EXTRA_COMPILERS += inst_modfile
 
diff --git a/src/3rdparty/webkit/WebCore/html/HTMLInputElement.h b/src/3rdparty/webkit/WebCore/html/HTMLInputElement.h
index c3b0a734fc..087cffa364 100644
--- a/src/3rdparty/webkit/WebCore/html/HTMLInputElement.h
+++ b/src/3rdparty/webkit/WebCore/html/HTMLInputElement.h
@@ -128,6 +128,10 @@ public:
     virtual bool isSearchField() const { return m_type == SEARCH; }
     virtual bool isInputTypeHidden() const { return m_type == HIDDEN; }
     virtual bool isPasswordField() const { return m_type == PASSWORD; }
+    bool isTelephoneField() const { return m_type == TELEPHONE; }
+    bool isNumberField() const { return m_type == NUMBER; }
+    bool isEmailField() const { return m_type == EMAIL; }
+    bool isUrlField() const { return m_type == URL; }
 
     bool checked() const { return m_checked; }
     void setChecked(bool, bool sendChangeEvent = false);
diff --git a/src/3rdparty/webkit/WebCore/page/EventHandler.cpp b/src/3rdparty/webkit/WebCore/page/EventHandler.cpp
index c40299cf9a..165425713e 100644
--- a/src/3rdparty/webkit/WebCore/page/EventHandler.cpp
+++ b/src/3rdparty/webkit/WebCore/page/EventHandler.cpp
@@ -952,6 +952,9 @@ bool EventHandler::scrollOverflow(ScrollDirection direction, ScrollGranularity g
 
 bool EventHandler::scrollRecursively(ScrollDirection direction, ScrollGranularity granularity, Node* startingNode)
 {
+    // The layout needs to be up to date to determine if we can scroll. We may be
+    // here because of an onLoad event, in which case the final layout hasn't been performed yet.
+    m_frame->document()->updateLayoutIgnorePendingStylesheets();
     bool handled = scrollOverflow(direction, granularity, startingNode);
     if (!handled) {
         Frame* frame = m_frame;
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/Font.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/Font.cpp
index 3d3ffe36f7..8e132e1520 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/Font.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/Font.cpp
@@ -38,7 +38,6 @@ using namespace Unicode;
 
 namespace WebCore {
 
-#if USE(FONT_FAST_PATH)
 const uint8_t Font::gRoundingHackCharacterTable[256] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*\t*/, 1 /*\n*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     1 /*space*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*-*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*?*/,
@@ -51,7 +50,6 @@ const uint8_t Font::gRoundingHackCharacterTable[256] = {
 };
 
 Font::CodePath Font::s_codePath = Auto;
-#endif
 
 // ============================================================================================
 // Font Implementation (Cross-Platform Portion)
@@ -174,31 +172,28 @@ void Font::drawText(GraphicsContext* context, const TextRun& run, const FloatPoi
     }
 #endif
 
-#if USE(FONT_FAST_PATH)
-    if (canUseGlyphCache(run))
+    if (codePath(run) != Complex)
         return drawSimpleText(context, run, point, from, to);
-#endif
 
     return drawComplexText(context, run, point, from, to);
 }
 
-float Font::floatWidth(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts) const
+float Font::floatWidth(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
 {
 #if ENABLE(SVG_FONTS)
     if (primaryFont()->isSVGFont())
         return floatWidthUsingSVGFont(run);
 #endif
 
-#if USE(FONT_FAST_PATH)
-    if (canUseGlyphCache(run)) {
+    CodePath codePathToUse = codePath(run);
+    if (codePathToUse != Complex) {
         // If the complex text implementation cannot return fallback fonts, avoid
         // returning them for simple text as well.
         static bool returnFallbackFonts = canReturnFallbackFontsForComplexText();
-        return floatWidthForSimpleText(run, 0, returnFallbackFonts ? fallbackFonts : 0);
+        return floatWidthForSimpleText(run, 0, returnFallbackFonts ? fallbackFonts : 0, codePathToUse == SimpleWithGlyphOverflow ? glyphOverflow : 0);
     }
-#endif
 
-    return floatWidthForComplexText(run, fallbackFonts);
+    return floatWidthForComplexText(run, fallbackFonts, glyphOverflow);
 }
 
 float Font::floatWidth(const TextRun& run, int extraCharsAvailable, int& charsConsumed, String& glyphName) const
@@ -213,10 +208,8 @@ float Font::floatWidth(const TextRun& run, int extraCharsAvailable, int& charsCo
     charsConsumed = run.length();
     glyphName = "";
 
-#if USE(FONT_FAST_PATH)
-    if (canUseGlyphCache(run))
+    if (codePath(run) != Complex)
         return floatWidthForSimpleText(run, 0);
-#endif
 
     return floatWidthForComplexText(run);
 }
@@ -230,10 +223,8 @@ FloatRect Font::selectionRectForText(const TextRun& run, const IntPoint& point,
 
     to = (to == -1 ? run.length() : to);
 
-#if USE(FONT_FAST_PATH)
-    if (canUseGlyphCache(run))
+    if (codePath(run) != Complex)
         return selectionRectForSimpleText(run, point, h, from, to);
-#endif
 
     return selectionRectForComplexText(run, point, h, from, to);
 }
@@ -245,10 +236,8 @@ int Font::offsetForPosition(const TextRun& run, int x, bool includePartialGlyphs
         return offsetForPositionForTextUsingSVGFont(run, x, includePartialGlyphs);
 #endif
 
-#if USE(FONT_FAST_PATH)
-    if (canUseGlyphCache(run))
+    if (codePath(run) != Complex)
         return offsetForPositionForSimpleText(run, x, includePartialGlyphs);
-#endif
 
     return offsetForPositionForComplexText(run, x, includePartialGlyphs);
 }
@@ -295,4 +284,79 @@ bool Font::shouldUseSmoothing()
     return shouldUseFontSmoothing;
 }
 
+void Font::setCodePath(CodePath p)
+{
+    s_codePath = p;
+}
+
+Font::CodePath Font::codePath()
+{
+    return s_codePath;
+}
+
+Font::CodePath Font::codePath(const TextRun& run) const
+{
+    if (s_codePath != Auto)
+        return s_codePath;
+
+#if PLATFORM(QT)
+    if (run.padding() || run.rtl() || isSmallCaps() || wordSpacing() || letterSpacing())
+        return Complex;
+#endif
+
+    // Start from 0 since drawing and highlighting also measure the characters before run->from
+    for (int i = 0; i < run.length(); i++) {
+        const UChar c = run[i];
+        if (c < 0x300) // U+0300 through U+036F Combining diacritical marks
+            continue;
+        if (c <= 0x36F)
+            return Complex;
+
+        if (c < 0x0591 || c == 0x05BE) // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha
+            continue;
+        if (c <= 0x05CF)
+            return Complex;
+
+        if (c < 0x0600) // U+0600 through U+1059 Arabic, Syriac, Thaana, Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar
+            continue;
+        if (c <= 0x1059)
+            return Complex;
+
+        if (c < 0x1100) // U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose; Modern Korean will be precomposed as a result of step A)
+            continue;
+        if (c <= 0x11FF)
+            return Complex;
+
+        if (c < 0x1780) // U+1780 through U+18AF Khmer, Mongolian
+            continue;
+        if (c <= 0x18AF)
+            return Complex;
+
+        if (c < 0x1900) // U+1900 through U+194F Limbu (Unicode 4.0)
+            continue;
+        if (c <= 0x194F)
+            return Complex;
+
+        if (c < 0x1E00) // U+1E00 through U+2000 characters with diacritics and stacked diacritics
+            continue;
+        if (c <= 0x2000)
+            return SimpleWithGlyphOverflow;
+
+        if (c < 0x20D0) // U+20D0 through U+20FF Combining marks for symbols
+            continue;
+        if (c <= 0x20FF)
+            return Complex;
+
+        if (c < 0xFE20) // U+FE20 through U+FE2F Combining half marks
+            continue;
+        if (c <= 0xFE2F)
+            return Complex;
+    }
+
+    if (typesettingFeatures())
+        return Complex;
+
+    return Simple;
+}
+
 }
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/Font.h b/src/3rdparty/webkit/WebCore/platform/graphics/Font.h
index 3c07be7412..772ad939f0 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/Font.h
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/Font.h
@@ -56,6 +56,21 @@ struct GlyphData;
 
 const unsigned defaultUnitsPerEm = 1000;
 
+struct GlyphOverflow {
+    GlyphOverflow()
+        : left(0)
+        , right(0)
+        , top(0)
+        , bottom(0)
+    {
+    }
+
+    int left;
+    int right;
+    int top;
+    int bottom;
+};
+
 class Font {
 public:
     Font();
@@ -81,8 +96,8 @@ public:
 
     void drawText(GraphicsContext*, const TextRun&, const FloatPoint&, int from = 0, int to = -1) const;
 
-    int width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts = 0) const { return lroundf(floatWidth(run, fallbackFonts)); }
-    float floatWidth(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
+    int width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* glyphOverflow = 0) const { return lroundf(floatWidth(run, fallbackFonts, glyphOverflow)); }
+    float floatWidth(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* glyphOverflow = 0) const;
     float floatWidth(const TextRun& run, int extraCharsAvailable, int& charsConsumed, String& glyphName) const;
 
     int offsetForPosition(const TextRun&, int position, bool includePartialGlyphs) const;
@@ -137,6 +152,8 @@ public:
     static void setShouldUseSmoothing(bool);
     static bool shouldUseSmoothing();
 
+    enum CodePath { Auto, Simple, Complex, SimpleWithGlyphOverflow };
+
 private:
 #if ENABLE(SVG_FONTS)
     void drawTextUsingSVGFont(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
@@ -146,20 +163,18 @@ private:
     int offsetForPositionForTextUsingSVGFont(const TextRun&, int position, bool includePartialGlyphs) const;
 #endif
 
-#if USE(FONT_FAST_PATH)
-    bool canUseGlyphCache(const TextRun&) const;
     void drawSimpleText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
     void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, int from, int to, const FloatPoint&) const;
     void drawGlyphBuffer(GraphicsContext*, const GlyphBuffer&, const TextRun&, const FloatPoint&) const;
-    float floatWidthForSimpleText(const TextRun&, GlyphBuffer*, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
+    float floatWidthForSimpleText(const TextRun&, GlyphBuffer*, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
     int offsetForPositionForSimpleText(const TextRun&, int position, bool includePartialGlyphs) const;
     FloatRect selectionRectForSimpleText(const TextRun&, const IntPoint&, int h, int from, int to) const;
 
     static bool canReturnFallbackFontsForComplexText();
-#endif
 
+    CodePath codePath(const TextRun&) const;
     void drawComplexText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
-    float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
+    float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
     int offsetForPositionForComplexText(const TextRun&, int position, bool includePartialGlyphs) const;
     FloatRect selectionRectForComplexText(const TextRun&, const IntPoint&, int h, int from, int to) const;
 
@@ -167,8 +182,6 @@ private:
 
 public:
     // Useful for debugging the different font rendering code paths.
-#if USE(FONT_FAST_PATH)
-    enum CodePath { Auto, Simple, Complex };
     static void setCodePath(CodePath);
     static CodePath codePath();
     static CodePath s_codePath;
@@ -178,7 +191,6 @@ public:
     {
         return (((c & ~0xFF) == 0 && gRoundingHackCharacterTable[c]));
     }
-#endif
 
     FontSelector* fontSelector() const;
     static bool treatAsSpace(UChar c) { return c == ' ' || c == '\t' || c == '\n' || c == 0x00A0; }
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/FontFastPath.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/FontFastPath.cpp
index 428e85ef35..b863e8346f 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/FontFastPath.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/FontFastPath.cpp
@@ -24,17 +24,17 @@
 #include "Font.h"
 
 #include "CharacterNames.h"
+#include "FloatRect.h"
 #include "FontCache.h"
 #include "FontFallbackList.h"
-#include "FloatRect.h"
 #include "GlyphBuffer.h"
 #include "GlyphPageTreeNode.h"
 #include "IntPoint.h"
 #include "SimpleFontData.h"
 #include "WidthIterator.h"
 
-#include <wtf/unicode/Unicode.h>
 #include <wtf/MathExtras.h>
+#include <wtf/unicode/Unicode.h>
 
 using namespace WTF;
 using namespace Unicode;
@@ -180,78 +180,6 @@ GlyphData Font::glyphDataForCharacter(UChar32 c, bool mirror, bool forceSmallCap
     return data;
 }
 
-void Font::setCodePath(CodePath p)
-{
-    s_codePath = p;
-}
-
-Font::CodePath Font::codePath()
-{
-    return s_codePath;
-}
-
-bool Font::canUseGlyphCache(const TextRun& run) const
-{
-    switch (s_codePath) {
-        case Auto:
-            break;
-        case Simple:
-            return true;
-        case Complex:
-            return false;
-    }
-    
-    // Start from 0 since drawing and highlighting also measure the characters before run->from
-    for (int i = 0; i < run.length(); i++) {
-        const UChar c = run[i];
-        if (c < 0x300)      // U+0300 through U+036F Combining diacritical marks
-            continue;
-        if (c <= 0x36F)
-            return false;
-
-        if (c < 0x0591 || c == 0x05BE)     // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha
-            continue;
-        if (c <= 0x05CF)
-            return false;
-
-        if (c < 0x0600)     // U+0600 through U+1059 Arabic, Syriac, Thaana, Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar
-            continue;
-        if (c <= 0x1059)
-            return false;
-
-        if (c < 0x1100)     // U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose; Modern Korean will be precomposed as a result of step A)
-            continue;
-        if (c <= 0x11FF)
-            return false;
-
-        if (c < 0x1780)     // U+1780 through U+18AF Khmer, Mongolian
-            continue;
-        if (c <= 0x18AF)
-            return false;
-
-        if (c < 0x1900)     // U+1900 through U+194F Limbu (Unicode 4.0)
-            continue;
-        if (c <= 0x194F)
-            return false;
-
-        if (c < 0x20D0)     // U+20D0 through U+20FF Combining marks for symbols
-            continue;
-        if (c <= 0x20FF)
-            return false;
-
-        if (c < 0xFE20)     // U+FE20 through U+FE2F Combining half marks
-            continue;
-        if (c <= 0xFE2F)
-            return false;
-    }
-
-    if (typesettingFeatures())
-        return false;
-
-    return true;
-
-}
-
 void Font::drawSimpleText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
 {
     // This glyph buffer holds our glyphs+advances+font data for each glyph.
@@ -314,10 +242,18 @@ void Font::drawGlyphBuffer(GraphicsContext* context, const GlyphBuffer& glyphBuf
     drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
 }
 
-float Font::floatWidthForSimpleText(const TextRun& run, GlyphBuffer* glyphBuffer, HashSet<const SimpleFontData*>* fallbackFonts) const
+float Font::floatWidthForSimpleText(const TextRun& run, GlyphBuffer* glyphBuffer, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
 {
-    WidthIterator it(this, run, fallbackFonts);
+    WidthIterator it(this, run, fallbackFonts, glyphOverflow);
     it.advance(run.length(), glyphBuffer);
+
+    if (glyphOverflow) {
+        glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-it.minGlyphBoundingBoxY()) - ascent());
+        glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(it.maxGlyphBoundingBoxY()) - descent());
+        glyphOverflow->left = ceilf(it.firstGlyphOverflow());
+        glyphOverflow->right = ceilf(it.lastGlyphOverflow());
+    }
+
     return it.m_runWidthSoFar;
 }
 
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/GlyphWidthMap.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.cpp
index 43cab65c32..d3c3180af5 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/GlyphWidthMap.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.cpp
@@ -27,14 +27,14 @@
  */
 
 #include "config.h"
-#include "GlyphWidthMap.h"
+#include "GlyphMetricsMap.h"
 
 namespace WebCore {
 
-GlyphWidthMap::GlyphWidthPage* GlyphWidthMap::locatePageSlowCase(unsigned pageNumber)
+GlyphMetricsMap::GlyphMetricsPage* GlyphMetricsMap::locatePageSlowCase(unsigned pageNumber)
 {
-    GlyphWidthPage* page;
-    if (pageNumber == 0) {
+    GlyphMetricsPage* page;
+    if (!pageNumber) {
         ASSERT(!m_filledPrimaryPage);
         page = &m_primaryPage;
         m_filledPrimaryPage = true;
@@ -43,14 +43,18 @@ GlyphWidthMap::GlyphWidthPage* GlyphWidthMap::locatePageSlowCase(unsigned pageNu
             if ((page = m_pages->get(pageNumber)))
                 return page;
         } else
-            m_pages.set(new HashMap<int, GlyphWidthPage*>);
-        page = new GlyphWidthPage;
+            m_pages.set(new HashMap<int, GlyphMetricsPage*>);
+        page = new GlyphMetricsPage;
         m_pages->set(pageNumber, page);
     }
 
-    // Fill in the whole page with the unknown glyph width value.
-    for (unsigned i = 0; i < GlyphWidthPage::size; i++)
-        page->setWidthForIndex(i, cGlyphWidthUnknown);
+    GlyphMetrics unknownMetrics;
+    unknownMetrics.horizontalAdvance = cGlyphSizeUnknown;
+    unknownMetrics.boundingBox.setWidth(cGlyphSizeUnknown);
+    unknownMetrics.boundingBox.setHeight(cGlyphSizeUnknown);
+    // Fill in the whole page with the unknown glyph information.
+    for (unsigned i = 0; i < GlyphMetricsPage::size; i++)
+        page->setMetricsForIndex(i, unknownMetrics);
 
     return page;
 }
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/GlyphWidthMap.h b/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h
index 66dea1fb2d..49854be8b3 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/GlyphWidthMap.h
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h
@@ -26,9 +26,10 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef GlyphWidthMap_h
-#define GlyphWidthMap_h
+#ifndef GlyphMetricsMap_h
+#define GlyphMetricsMap_h
 
+#include "FloatRect.h"
 #include <wtf/HashMap.h>
 #include <wtf/OwnPtr.h>
 #include <wtf/unicode/Unicode.h>
@@ -37,53 +38,67 @@ namespace WebCore {
 
 typedef unsigned short Glyph;
 
-const float cGlyphWidthUnknown = -1;
+const float cGlyphSizeUnknown = -1;
 
-class GlyphWidthMap : public Noncopyable {
+struct GlyphMetrics {
+    float horizontalAdvance;
+    FloatRect boundingBox;
+};
+
+class GlyphMetricsMap : public Noncopyable {
 public:
-    GlyphWidthMap() : m_filledPrimaryPage(false) { }
-    ~GlyphWidthMap() { if (m_pages) { deleteAllValues(*m_pages); } }
+    GlyphMetricsMap() : m_filledPrimaryPage(false) { }
+    ~GlyphMetricsMap()
+    { 
+        if (m_pages)
+            deleteAllValues(*m_pages);
+    }
+
+    GlyphMetrics metricsForGlyph(Glyph glyph)
+    {
+        return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph);
+    }
 
     float widthForGlyph(Glyph glyph)
     {
-        return locatePage(glyph / GlyphWidthPage::size)->widthForGlyph(glyph);
+        return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph).horizontalAdvance;
     }
 
-    void setWidthForGlyph(Glyph glyph, float width)
+    void setMetricsForGlyph(Glyph glyph, const GlyphMetrics& metrics)
     {
-        locatePage(glyph / GlyphWidthPage::size)->setWidthForGlyph(glyph, width);
+        locatePage(glyph / GlyphMetricsPage::size)->setMetricsForGlyph(glyph, metrics);
     }
 
 private:
-    struct GlyphWidthPage {
+    struct GlyphMetricsPage {
         static const size_t size = 256; // Usually covers Latin-1 in a single page.
-        float m_widths[size];
+        GlyphMetrics m_metrics[size];
 
-        float widthForGlyph(Glyph glyph) const { return m_widths[glyph % size]; }
-        void setWidthForGlyph(Glyph glyph, float width)
+        GlyphMetrics metricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; }
+        void setMetricsForGlyph(Glyph glyph, const GlyphMetrics& metrics)
         {
-            setWidthForIndex(glyph % size, width);
+            setMetricsForIndex(glyph % size, metrics);
         }
-        void setWidthForIndex(unsigned index, float width)
+        void setMetricsForIndex(unsigned index, const GlyphMetrics& metrics)
         {
-            m_widths[index] = width;
+            m_metrics[index] = metrics;
         }
     };
     
-    GlyphWidthPage* locatePage(unsigned pageNumber)
+    GlyphMetricsPage* locatePage(unsigned pageNumber)
     {
         if (!pageNumber && m_filledPrimaryPage)
             return &m_primaryPage;
         return locatePageSlowCase(pageNumber);
     }
 
-    GlyphWidthPage* locatePageSlowCase(unsigned pageNumber);
+    GlyphMetricsPage* locatePageSlowCase(unsigned pageNumber);
     
     bool m_filledPrimaryPage;
-    GlyphWidthPage m_primaryPage; // We optimize for the page that contains glyph indices 0-255.
-    OwnPtr<HashMap<int, GlyphWidthPage*> > m_pages;
+    GlyphMetricsPage m_primaryPage; // We optimize for the page that contains glyph indices 0-255.
+    OwnPtr<HashMap<int, GlyphMetricsPage*> > m_pages;
 };
 
-}
+} // namespace WebCore
 
 #endif
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.cpp
index 2ec8abb8e2..04b6ab1c04 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.cpp
@@ -157,9 +157,11 @@ void SimpleFontData::platformGlyphInit()
     // are mapped to the ZERO WIDTH SPACE glyph.
     Glyph zeroWidthSpaceGlyph = glyphPageZero->glyphDataForCharacter(0).glyph;
     if (zeroWidthSpaceGlyph) {
-        if (zeroWidthSpaceGlyph != m_spaceGlyph)
-            m_glyphToWidthMap.setWidthForGlyph(zeroWidthSpaceGlyph, 0);
-        else
+        if (zeroWidthSpaceGlyph != m_spaceGlyph) {
+            GlyphMetrics metrics;
+            metrics.horizontalAdvance = 0;
+            m_glyphToMetricsMap.setMetricsForGlyph(zeroWidthSpaceGlyph, metrics);
+        } else
             LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. Glyph width not overridden.");
     }
 
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.h b/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.h
index 0366e3b989..efdbba4877 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.h
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/SimpleFontData.h
@@ -26,8 +26,8 @@
 
 #include "FontData.h"
 #include "FontPlatformData.h"
+#include "GlyphMetricsMap.h"
 #include "GlyphPageTreeNode.h"
-#include "GlyphWidthMap.h"
 #include "TypesettingFeatures.h"
 #include <wtf/OwnPtr.h>
 
@@ -58,9 +58,9 @@ class FontDescription;
 class FontPlatformData;
 class SharedBuffer;
 class SVGFontData;
-class WidthMap;
 
 enum Pitch { UnknownPitch, FixedPitch, VariablePitch };
+enum GlyphMetricsMode { GlyphBoundingBox, GlyphWidthOnly };
 
 class SimpleFontData : public FontData {
 public:
@@ -81,8 +81,9 @@ public:
     float xHeight() const { return m_xHeight; }
     unsigned unitsPerEm() const { return m_unitsPerEm; }
 
-    float widthForGlyph(Glyph) const;
-    float platformWidthForGlyph(Glyph) const;
+    float widthForGlyph(Glyph glyph) const { return metricsForGlyph(glyph, GlyphWidthOnly).horizontalAdvance; }
+    GlyphMetrics metricsForGlyph(Glyph, GlyphMetricsMode = GlyphBoundingBox) const;
+    GlyphMetrics platformMetricsForGlyph(Glyph, GlyphMetricsMode) const;
 
     float spaceWidth() const { return m_spaceWidth; }
     float adjustedSpaceWidth() const { return m_adjustedSpaceWidth; }
@@ -167,7 +168,7 @@ private:
     || (OS(WINDOWS) && PLATFORM(WX))
     void initGDIFont();
     void platformCommonDestroy();
-    float widthForGDIGlyph(Glyph glyph) const;
+    GlyphMetrics metricsForGDIGlyph(Glyph glyph) const;
 #endif
 
     int m_ascent;
@@ -181,7 +182,7 @@ private:
 
     FontPlatformData m_platformData;
 
-    mutable GlyphWidthMap m_glyphToWidthMap;
+    mutable GlyphMetricsMap m_glyphToMetricsMap;
 
     bool m_treatAsFixedPitch;
 
@@ -237,16 +238,16 @@ private:
     
     
 #if !PLATFORM(QT)
-ALWAYS_INLINE float SimpleFontData::widthForGlyph(Glyph glyph) const
+ALWAYS_INLINE GlyphMetrics SimpleFontData::metricsForGlyph(Glyph glyph, GlyphMetricsMode metricsMode) const
 {
-    float width = m_glyphToWidthMap.widthForGlyph(glyph);
-    if (width != cGlyphWidthUnknown)
-        return width;
-    
-    width = platformWidthForGlyph(glyph);
-    m_glyphToWidthMap.setWidthForGlyph(glyph, width);
-    
-    return width;
+    GlyphMetrics metrics = m_glyphToMetricsMap.metricsForGlyph(glyph);
+    if ((metricsMode == GlyphWidthOnly && metrics.horizontalAdvance != cGlyphSizeUnknown) || (metricsMode == GlyphBoundingBox && metrics.boundingBox.width() != cGlyphSizeUnknown))
+        return metrics;
+
+    metrics = platformMetricsForGlyph(glyph, metricsMode);
+    m_glyphToMetricsMap.setMetricsForGlyph(glyph, metrics);
+
+    return metrics;
 }
 #endif
 
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.cpp
index 9157310646..996ce40f8e 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.cpp
@@ -33,13 +33,14 @@
 
 using namespace WTF;
 using namespace Unicode;
+using namespace std;
 
 namespace WebCore {
 
 // According to http://www.unicode.org/Public/UNIDATA/UCD.html#Canonical_Combining_Class_Values
 static const uint8_t hiraganaKatakanaVoicingMarksCombiningClass = 8;
 
-WidthIterator::WidthIterator(const Font* font, const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts)
+WidthIterator::WidthIterator(const Font* font, const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, bool accountForGlyphBounds)
     : m_font(font)
     , m_run(run)
     , m_end(run.length())
@@ -47,6 +48,11 @@ WidthIterator::WidthIterator(const Font* font, const TextRun& run, HashSet<const
     , m_runWidthSoFar(0)
     , m_finalRoundingWidth(0)
     , m_fallbackFonts(fallbackFonts)
+    , m_accountForGlyphBounds(accountForGlyphBounds)
+    , m_maxGlyphBoundingBoxY(numeric_limits<float>::min())
+    , m_minGlyphBoundingBoxY(numeric_limits<float>::max())
+    , m_firstGlyphOverflow(0)
+    , m_lastGlyphOverflow(0)
 {
     // If the padding is non-zero, count the number of spaces in the run
     // and divide that by the padding for per space addition.
@@ -79,6 +85,7 @@ void WidthIterator::advance(int offset, GlyphBuffer* glyphBuffer)
 
     float runWidthSoFar = m_runWidthSoFar;
     float lastRoundingWidth = m_finalRoundingWidth;
+    FloatRect bounds;
 
     const SimpleFontData* primaryFont = m_font->primaryFont();
     const SimpleFontData* lastFontData = primaryFont;
@@ -175,6 +182,12 @@ void WidthIterator::advance(int offset, GlyphBuffer* glyphBuffer)
             }
         }
 
+        if (m_accountForGlyphBounds) {
+            bounds = fontData->boundsForGlyph(glyph);
+            if (!currentCharacter)
+                m_firstGlyphOverflow = max<float>(0, -bounds.x());
+        }
+
         // Advance past the character we just dealt with.
         cp += clusterLength;
         currentCharacter += clusterLength;
@@ -205,6 +218,12 @@ void WidthIterator::advance(int offset, GlyphBuffer* glyphBuffer)
             glyphBuffer->add(glyph, fontData, (rtl ? oldWidth + lastRoundingWidth : width));
 
         lastRoundingWidth = width - oldWidth;
+
+        if (m_accountForGlyphBounds) {
+            m_maxGlyphBoundingBoxY = max(m_maxGlyphBoundingBoxY, bounds.bottom());
+            m_minGlyphBoundingBoxY = min(m_minGlyphBoundingBoxY, bounds.y());
+            m_lastGlyphOverflow = max<float>(0, bounds.right() - width);
+        }
     }
 
     m_currentCharacter = currentCharacter;
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.h b/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.h
index 7ca4198edc..d42a0c5e95 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.h
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/WidthIterator.h
@@ -33,11 +33,16 @@ class SimpleFontData;
 class TextRun;
 
 struct WidthIterator {
-    WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0);
+    WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false);
 
     void advance(int to, GlyphBuffer* = 0);
     bool advanceOneCharacter(float& width, GlyphBuffer* = 0);
 
+    float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; }
+    float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; }
+    float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; }
+    float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; }
+
     const Font* m_font;
 
     const TextRun& m_run;
@@ -51,7 +56,13 @@ struct WidthIterator {
 
 private:
     UChar32 normalizeVoicingMarks(int currentCharacter);
+
     HashSet<const SimpleFontData*>* m_fallbackFonts;
+    bool m_accountForGlyphBounds;
+    float m_maxGlyphBoundingBoxY;
+    float m_minGlyphBoundingBoxY;
+    float m_firstGlyphOverflow;
+    float m_lastGlyphOverflow;
 };
 
 }
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/qt/FontQt.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/qt/FontQt.cpp
index ae1033e105..06885ba9ec 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/qt/FontQt.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/qt/FontQt.cpp
@@ -44,11 +44,15 @@
 
 namespace WebCore {
 
-static const QString fromRawDataWithoutRef(const String& string)
+static const QString fromRawDataWithoutRef(const String& string, int start = 0, int len = -1)
 {
+    if (len < 0)
+        len = string.length() - start;
+    Q_ASSERT(start + len <= string.length());
+
     // We don't detach. This assumes the WebCore string data will stay valid for the
     // lifetime of the QString we pass back, since we don't ref the WebCore string.
-    return QString::fromRawData(reinterpret_cast<const QChar*>(string.characters()), string.length());
+    return QString::fromRawData(reinterpret_cast<const QChar*>(string.characters() + start), len);
 }
 
 static QTextLine setupLayout(QTextLayout* layout, const TextRun& style)
@@ -66,7 +70,7 @@ static QTextLine setupLayout(QTextLayout* layout, const TextRun& style)
     return line;
 }
 
-void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
+static void drawTextCommon(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to, const QFont& font, bool isComplexText)
 {
     if (to < 0)
         to = run.length();
@@ -102,6 +106,7 @@ void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const Float
 
     String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
     QString string = fromRawDataWithoutRef(sanitized);
+    QPointF pt(point.x(), point.y());
 
     // text shadow
     IntSize shadowSize;
@@ -110,52 +115,63 @@ void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const Float
     bool hasShadow = ctx->textDrawingMode() == cTextFill && ctx->getShadow(shadowSize, shadowBlur, shadowColor);
 
     if (from > 0 || to < run.length()) {
-        QTextLayout layout(string, font());
-        QTextLine line = setupLayout(&layout, run);
-        float x1 = line.cursorToX(from);
-        float x2 = line.cursorToX(to);
-        if (x2 < x1)
-            qSwap(x1, x2);
-
-        QFontMetrics fm(font());
-        int ascent = fm.ascent();
-        QRectF clip(point.x() + x1, point.y() - ascent, x2 - x1, fm.height());
-
-        if (hasShadow) {
-            // TODO: when blur support is added, the clip will need to account
-            // for the blur radius
-            qreal dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
-            if (shadowSize.width() > 0)
-                dx2 = shadowSize.width();
-            else
-                dx1 = -shadowSize.width();
-            if (shadowSize.height() > 0)
-                dy2 = shadowSize.height();
-            else
-                dy1 = -shadowSize.height();
-            // expand the clip rect to include the text shadow as well
-            clip.adjust(dx1, dx2, dy1, dy2);
-        }
-        p->save();
-        p->setClipRect(clip.toRect(), Qt::IntersectClip);
-        QPointF pt(point.x(), point.y() - ascent);
-        if (hasShadow) {
+        if (isComplexText) {
+            QTextLayout layout(string, font);
+            QTextLine line = setupLayout(&layout, run);
+            float x1 = line.cursorToX(from);
+            float x2 = line.cursorToX(to);
+            if (x2 < x1)
+                qSwap(x1, x2);
+
+            QFontMetrics fm(font);
+            int ascent = fm.ascent();
+            QRectF clip(point.x() + x1, point.y() - ascent, x2 - x1, fm.height());
+
+            if (hasShadow) {
+                // TODO: when blur support is added, the clip will need to account
+                // for the blur radius
+                qreal dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
+                if (shadowSize.width() > 0)
+                    dx2 = shadowSize.width();
+                else
+                    dx1 = -shadowSize.width();
+                if (shadowSize.height() > 0)
+                    dy2 = shadowSize.height();
+                else
+                    dy1 = -shadowSize.height();
+                // expand the clip rect to include the text shadow as well
+                clip.adjust(dx1, dx2, dy1, dy2);
+            }
             p->save();
-            p->setPen(QColor(shadowColor));
-            p->translate(shadowSize.width(), shadowSize.height());
+            p->setClipRect(clip.toRect(), Qt::IntersectClip);
+            pt.setY(pt.y() - ascent);
+            if (hasShadow) {
+                p->save();
+                p->setPen(QColor(shadowColor));
+                p->translate(shadowSize.width(), shadowSize.height());
+                line.draw(p, pt);
+                p->restore();
+            }
+            p->setPen(textFillPen);
             line.draw(p, pt);
             p->restore();
+            return;
         }
-        p->setPen(textFillPen);
-        line.draw(p, pt);
-        p->restore();
-        return;
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
+        int skipWidth = QFontMetrics(font).width(string, from, Qt::TextBypassShaping);
+        pt.setX(pt.x() + skipWidth);
+        string = fromRawDataWithoutRef(sanitized, from, to - from);
+#endif
     }
 
-    p->setFont(font());
+    p->setFont(font);
 
-    QPointF pt(point.x(), point.y());
     int flags = run.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
+    // See QWebPagePrivate::QWebPagePrivate() where the default path is set to Complex for Qt 4.6 and earlier.
+    if (!isComplexText)
+        flags |= Qt::TextBypassShaping;
+#endif
     if (hasShadow) {
         // TODO: text shadow blur support
         p->save();
@@ -166,7 +182,7 @@ void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const Float
     }
     if (ctx->textDrawingMode() & cTextStroke) {
         QPainterPath path;
-        path.addText(pt, font(), string);
+        path.addText(pt, font, string);
         p->setPen(textStrokePen);
         p->strokePath(path, p->pen());
     }
@@ -176,13 +192,49 @@ void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const Float
     }
 }
 
-float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>*) const
+void Font::drawSimpleText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
+    drawTextCommon(ctx, run, point, from, to, font(), /* isComplexText = */false);
+#else
+    Q_ASSERT(false);
+#endif
+}
+
+void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
+{
+    drawTextCommon(ctx, run, point, from, to, font(), /* isComplexText = */true);
+}
+
+float Font::floatWidthForSimpleText(const TextRun& run, GlyphBuffer* glyphBuffer, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
+    if (!run.length())
+        return 0;
+
+    String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
+    QString string = fromRawDataWithoutRef(sanitized);
+
+    int w = QFontMetrics(font()).width(string, -1, Qt::TextBypassShaping);
+
+    // WebKit expects us to ignore word spacing on the first character (as opposed to what Qt does)
+    if (treatAsSpace(run[0]))
+        w -= m_wordSpacing;
+
+    return w + run.padding();
+#else
+    Q_ASSERT(false);
+    return 0.0f;
+#endif
+}
+
+float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>*, GlyphOverflow*) const
 {
     if (!run.length())
         return 0;
 
     if (run.length() == 1 && treatAsSpace(run[0]))
-        return QFontMetrics(font()).width(run[0]) - m_wordSpacing + run.padding();
+        return QFontMetrics(font()).width(run[0]) + run.padding();
 
     String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
     QString string = fromRawDataWithoutRef(sanitized);
@@ -195,6 +247,34 @@ float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFon
     return w + run.padding();
 }
 
+int Font::offsetForPositionForSimpleText(const TextRun& run, int position, bool includePartialGlyphs) const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
+    String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
+    QString string = fromRawDataWithoutRef(sanitized);
+
+    QFontMetrics fm(font());
+    float delta = (float)position;
+    int curPos = 0;
+    do {
+        float charWidth = fm.width(string[curPos]);
+        delta -= charWidth;
+        if (includePartialGlyphs) {
+            if (delta + charWidth / 2 <= 0)
+                break;
+        } else {
+            if (delta + charWidth <= 0)
+                break;
+        }
+    } while (++curPos < string.size());
+
+    return curPos;
+#else
+    Q_ASSERT(false);
+    return 0;
+#endif
+}
+
 int Font::offsetForPositionForComplexText(const TextRun& run, int position, bool) const
 {
     String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
@@ -205,6 +285,23 @@ int Font::offsetForPositionForComplexText(const TextRun& run, int position, bool
     return line.xToCursor(position);
 }
 
+FloatRect Font::selectionRectForSimpleText(const TextRun& run, const IntPoint& pt, int h, int from, int to) const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
+    String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
+    QString wholeText = fromRawDataWithoutRef(sanitized);
+    QString selectedText = fromRawDataWithoutRef(sanitized, from, to - from);
+
+    int startX = QFontMetrics(font()).width(wholeText, from, Qt::TextBypassShaping);
+    int width = QFontMetrics(font()).width(selectedText, -1, Qt::TextBypassShaping);
+
+    return FloatRect(pt.x() + startX, pt.y(), width, h);
+#else
+    Q_ASSERT(false);
+    return FloatRect();
+#endif
+}
+
 FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& pt, int h, int from, int to) const
 {
     String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
@@ -221,6 +318,11 @@ FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint&
     return FloatRect(pt.x() + x1, pt.y(), x2 - x1, h);
 }
 
+bool Font::canReturnFallbackFontsForComplexText()
+{
+    return false;
+}
+
 QFont Font::font() const
 {
     QFont f = primaryFont()->getQtFont();
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/qt/ImageDecoderQt.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/qt/ImageDecoderQt.cpp
index cc707da1b1..fb3d6219d9 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/qt/ImageDecoderQt.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/qt/ImageDecoderQt.cpp
@@ -78,9 +78,6 @@ void ImageDecoderQt::setData(SharedBuffer* data, bool allDataReceived)
     m_buffer->open(QIODevice::ReadOnly | QIODevice::Unbuffered);
     m_reader.set(new QImageReader(m_buffer.get(), m_format));
 
-    // This will force the JPEG decoder to use JDCT_IFAST
-    m_reader->setQuality(49);
-
     // QImageReader only allows retrieving the format before reading the image
     m_format = m_reader->format();
 }
@@ -188,9 +185,21 @@ void ImageDecoderQt::internalReadImage(size_t frameIndex)
 
 bool ImageDecoderQt::internalHandleCurrentImage(size_t frameIndex)
 {
-    // Now get the QImage from Qt and place it in the RGBA32Buffer
-    QImage img;
-    if (!m_reader->read(&img)) {
+    QPixmap pixmap;
+    bool pixmapLoaded;
+    const int imageCount = m_reader->imageCount();
+    if (imageCount == 0 || imageCount == 1)
+        pixmapLoaded = pixmap.loadFromData((const uchar*)(m_data->data()), m_data->size(), m_format);
+    else {
+        QImage img;
+        const bool imageLoaded = m_reader->read(&img);
+        if (imageLoaded) {
+            pixmap = QPixmap::fromImage(img);
+            pixmapLoaded = true;
+        }
+    }
+
+    if (!pixmapLoaded) {
         frameCount();
         repetitionCount();
         clearPointers();
@@ -198,12 +207,11 @@ bool ImageDecoderQt::internalHandleCurrentImage(size_t frameIndex)
     }
 
     // now into the RGBA32Buffer - even if the image is not
-    QSize imageSize = img.size();
     RGBA32Buffer* const buffer = &m_frameBufferCache[frameIndex];
     buffer->setRect(m_reader->currentImageRect());
     buffer->setStatus(RGBA32Buffer::FrameComplete);
     buffer->setDuration(m_reader->nextImageDelay());
-    buffer->setDecodedImage(img);
+    buffer->setPixmap(pixmap);
     return true;
 }
 
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/win/FontWin.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/win/FontWin.cpp
index 27d8dee712..717171f093 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/win/FontWin.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/win/FontWin.cpp
@@ -34,6 +34,8 @@
 #include "UniscribeController.h"
 #include <wtf/MathExtras.h>
 
+using namespace std;
+
 namespace WebCore {
 
 bool Font::canReturnFallbackFontsForComplexText()
@@ -89,10 +91,16 @@ void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const F
     drawGlyphBuffer(context, glyphBuffer, run, startPoint);
 }
 
-float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts) const
+float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
 {
     UniscribeController controller(this, run, fallbackFonts);
     controller.advance(run.length());
+    if (glyphOverflow) {
+        glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minGlyphBoundingBoxY()) - ascent());
+        glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller.maxGlyphBoundingBoxY()) - descent());
+        glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX()));
+        glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.runWidthSoFar()));
+    }
     return controller.runWidthSoFar();
 }
 
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataCGWin.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataCGWin.cpp
index 6b3a96e067..ee3a980693 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataCGWin.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataCGWin.cpp
@@ -126,10 +126,10 @@ void SimpleFontData::platformCharWidthInit()
     }
 }
 
-float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
+GlyphMetrics SimpleFontData::platformMetricsForGlyph(Glyph glyph, GlyphMetricsMode metricsMode) const
 {
     if (m_platformData.useGDI())
-       return widthForGDIGlyph(glyph);
+       return metricsForGDIGlyph(glyph);
 
     CGFontRef font = m_platformData.cgFont();
     float pointSize = m_platformData.size();
@@ -139,8 +139,18 @@ float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
     // FIXME: Need to add real support for printer fonts.
     bool isPrinterFont = false;
     wkGetGlyphAdvances(font, m, m_isSystemFont, isPrinterFont, glyph, advance);
-
-    return advance.width + m_syntheticBoldOffset;
+    GlyphMetrics metrics;
+    metrics.horizontalAdvance = advance.width + m_syntheticBoldOffset;
+    
+    if (metricsMode == GlyphBoundingBox) {
+        CGRect boundingBox;
+        CGFontGetGlyphBBoxes(font, &glyph, 1, &boundingBox);
+        CGFloat scale = pointSize / unitsPerEm();
+        metrics.boundingBox = CGRectApplyAffineTransform(boundingBox, CGAffineTransformMakeScale(scale, -scale));
+        if (m_syntheticBoldOffset)
+            metrics.boundingBox.setWidth(metrics.boundingBox.width() + m_syntheticBoldOffset);
+    }
+    return metrics;
 }
 
 }
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataWin.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataWin.cpp
index 5a3244ce10..f85f9ba544 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataWin.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/win/SimpleFontDataWin.cpp
@@ -179,16 +179,25 @@ void SimpleFontData::determinePitch()
     ReleaseDC(0, dc);
 }
 
-float SimpleFontData::widthForGDIGlyph(Glyph glyph) const
+GlyphMetrics SimpleFontData::metricsForGDIGlyph(Glyph glyph) const
 {
     HDC hdc = GetDC(0);
     SetGraphicsMode(hdc, GM_ADVANCED);
     HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
-    int width;
-    GetCharWidthI(hdc, glyph, 1, 0, &width);
+
+    GLYPHMETRICS gdiMetrics;
+    static const MAT2 identity = { 0, 1,  0, 0,  0, 0,  0, 1 };
+    GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity);
+
     SelectObject(hdc, oldFont);
     ReleaseDC(0, hdc);
-    return width + m_syntheticBoldOffset;
+
+    GlyphMetrics glyphMetrics;
+    glyphMetrics.horizontalAdvance = gdiMetrics.gmCellIncX + m_syntheticBoldOffset;
+    glyphMetrics.boundingBox = FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y,
+        gdiMetrics.gmBlackBoxX + m_syntheticBoldOffset, gdiMetrics.gmBlackBoxY);
+
+    return glyphMetrics;
 }
 
 SCRIPT_FONTPROPERTIES* SimpleFontData::scriptFontProperties() const
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.cpp b/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.cpp
index f382857715..cfa15a2703 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.cpp
@@ -32,6 +32,8 @@
 #include "SimpleFontData.h"
 #include <wtf/MathExtras.h>
 
+using namespace std;
+
 namespace WebCore {
 
 // FIXME: Rearchitect this to be more like WidthIterator in Font.cpp.  Have an advance() method
@@ -39,16 +41,20 @@ namespace WebCore {
 // take the GlyphBuffer as an arg so that we don't have to populate the glyph buffer when
 // measuring.
 UniscribeController::UniscribeController(const Font* font, const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts)
-: m_font(*font)
-, m_run(run)
-, m_fallbackFonts(fallbackFonts)
-, m_end(run.length())
-, m_currentCharacter(0)
-, m_runWidthSoFar(0)
-, m_computingOffsetPosition(false)
-, m_includePartialGlyphs(false)
-, m_offsetX(0)
-, m_offsetPosition(0)
+    : m_font(*font)
+    , m_run(run)
+    , m_fallbackFonts(fallbackFonts)
+    , m_minGlyphBoundingBoxX(numeric_limits<float>::max())
+    , m_maxGlyphBoundingBoxX(numeric_limits<float>::min())
+    , m_minGlyphBoundingBoxY(numeric_limits<float>::max())
+    , m_maxGlyphBoundingBoxY(numeric_limits<float>::min())
+    , m_end(run.length())
+    , m_currentCharacter(0)
+    , m_runWidthSoFar(0)
+    , m_computingOffsetPosition(false)
+    , m_includePartialGlyphs(false)
+    , m_offsetX(0)
+    , m_offsetPosition(0)
 {
     m_padding = m_run.padding();
     if (!m_padding)
@@ -374,6 +380,14 @@ bool UniscribeController::shapeAndPlaceItem(const UChar* cp, unsigned i, const S
             glyphBuffer->add(glyph, fontData, advance, &size);
         }
 
+        GlyphMetrics glyphMetrics = fontData->metricsForGlyph(glyph);
+        glyphMetrics.boundingBox.move(m_glyphOrigin.x(), m_glyphOrigin.y());
+        m_minGlyphBoundingBoxX = min(m_minGlyphBoundingBoxX, glyphMetrics.boundingBox.x());
+        m_maxGlyphBoundingBoxX = max(m_maxGlyphBoundingBoxX, glyphMetrics.boundingBox.right());
+        m_minGlyphBoundingBoxY = min(m_minGlyphBoundingBoxY, glyphMetrics.boundingBox.y());
+        m_maxGlyphBoundingBoxY = max(m_maxGlyphBoundingBoxY, glyphMetrics.boundingBox.bottom());
+        m_glyphOrigin.move(advance + offsetX, -offsetY);
+
         // Mutate the glyph array to contain our altered advances.
         if (m_computingOffsetPosition)
             advances[k] = advance;
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.h b/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.h
index 23b8108b11..09203b5e9a 100644
--- a/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.h
+++ b/src/3rdparty/webkit/WebCore/platform/graphics/win/UniscribeController.h
@@ -49,6 +49,11 @@ public:
     // Returns the width of everything we've consumed so far.
     float runWidthSoFar() const { return m_runWidthSoFar; }
 
+    float minGlyphBoundingBoxX() const { return m_minGlyphBoundingBoxX; }
+    float maxGlyphBoundingBoxX() const { return m_maxGlyphBoundingBoxX; }
+    float minGlyphBoundingBoxY() const { return m_minGlyphBoundingBoxY; }
+    float maxGlyphBoundingBoxY() const { return m_maxGlyphBoundingBoxY; }
+
 private:    
     void resetControlAndState();
 
@@ -61,6 +66,11 @@ private:
     const Font& m_font;
     const TextRun& m_run;
     HashSet<const SimpleFontData*>* m_fallbackFonts;
+    FloatPoint m_glyphOrigin;
+    float m_minGlyphBoundingBoxX;
+    float m_maxGlyphBoundingBoxX;
+    float m_minGlyphBoundingBoxY;
+    float m_maxGlyphBoundingBoxY;
 
     SCRIPT_CONTROL m_control;
     SCRIPT_STATE m_state;
diff --git a/src/3rdparty/webkit/WebCore/platform/image-decoders/ImageDecoder.h b/src/3rdparty/webkit/WebCore/platform/image-decoders/ImageDecoder.h
index d526e5e819..10747537c4 100644
--- a/src/3rdparty/webkit/WebCore/platform/image-decoders/ImageDecoder.h
+++ b/src/3rdparty/webkit/WebCore/platform/image-decoders/ImageDecoder.h
@@ -40,6 +40,7 @@
 #if PLATFORM(SKIA)
 #include "NativeImageSkia.h"
 #elif PLATFORM(QT)
+#include <QPixmap>
 #include <QImage>
 #endif
 
@@ -130,8 +131,7 @@ namespace WebCore {
         }
 
 #if PLATFORM(QT)
-        void setDecodedImage(const QImage& image);
-        QImage decodedImage() const { return m_image; }
+        void setPixmap(const QPixmap& pixmap);
 #endif
 
     private:
@@ -143,6 +143,8 @@ namespace WebCore {
 #if PLATFORM(SKIA)
             return m_bitmap.getAddr32(x, y);
 #elif PLATFORM(QT)
+            m_image = m_pixmap.toImage();
+            m_pixmap = QPixmap();
             return reinterpret_cast<QRgb*>(m_image.scanLine(y)) + x;
 #else
             return m_bytes.data() + (y * width()) + x;
@@ -168,6 +170,7 @@ namespace WebCore {
 #if PLATFORM(SKIA)
         NativeImageSkia m_bitmap;
 #elif PLATFORM(QT)
+        mutable QPixmap m_pixmap;
         mutable QImage m_image;
         bool m_hasAlpha;
         IntSize m_size;
diff --git a/src/3rdparty/webkit/WebCore/platform/image-decoders/qt/RGBA32BufferQt.cpp b/src/3rdparty/webkit/WebCore/platform/image-decoders/qt/RGBA32BufferQt.cpp
index b2e5e1765a..044515abd9 100644
--- a/src/3rdparty/webkit/WebCore/platform/image-decoders/qt/RGBA32BufferQt.cpp
+++ b/src/3rdparty/webkit/WebCore/platform/image-decoders/qt/RGBA32BufferQt.cpp
@@ -57,6 +57,7 @@ RGBA32Buffer& RGBA32Buffer::operator=(const RGBA32Buffer& other)
 
 void RGBA32Buffer::clear()
 {
+    m_pixmap = QPixmap();
     m_image = QImage();
     m_status = FrameEmpty;
     // NOTE: Do not reset other members here; clearFrameBufferCache()
@@ -67,7 +68,11 @@ void RGBA32Buffer::clear()
 
 void RGBA32Buffer::zeroFill()
 {
-    m_image.fill(0);
+    if (m_pixmap.isNull() && !m_image.isNull()) {
+        m_pixmap = QPixmap(m_image.width(), m_image.height());
+        m_image = QImage();
+    }
+    m_pixmap.fill(QColor(0, 0, 0, 0));
 }
 
 void RGBA32Buffer::copyBitmapData(const RGBA32Buffer& other)
@@ -76,6 +81,7 @@ void RGBA32Buffer::copyBitmapData(const RGBA32Buffer& other)
         return;
 
     m_image = other.m_image;
+    m_pixmap = other.m_pixmap;
     m_size = other.m_size;
     m_hasAlpha = other.m_hasAlpha;
 }
@@ -87,8 +93,9 @@ bool RGBA32Buffer::setSize(int newWidth, int newHeight)
     ASSERT(width() == 0 && height() == 0);
 
     m_size = IntSize(newWidth, newHeight);
-    m_image = QImage(newWidth, newHeight, QImage::Format_ARGB32_Premultiplied);
-    if (m_image.isNull())
+    m_image = QImage();
+    m_pixmap = QPixmap(newWidth, newHeight);
+    if (m_pixmap.isNull())
         return false;
 
     // Zero the image.
@@ -99,10 +106,11 @@ bool RGBA32Buffer::setSize(int newWidth, int newHeight)
 
 QPixmap* RGBA32Buffer::asNewNativeImage() const
 {
-    QPixmap pix = QPixmap::fromImage(m_image);
-    m_image = QImage();
-
-    return new QPixmap(pix);
+    if (m_pixmap.isNull() && !m_image.isNull()) {
+        m_pixmap = QPixmap::fromImage(m_image);
+        m_image = QImage();
+    }
+    return new QPixmap(m_pixmap);
 }
 
 bool RGBA32Buffer::hasAlpha() const
@@ -121,11 +129,12 @@ void RGBA32Buffer::setStatus(FrameStatus status)
 }
 
 // The image must not have format 8888 pre multiplied...
-void RGBA32Buffer::setDecodedImage(const QImage& image)
+void RGBA32Buffer::setPixmap(const QPixmap& pixmap)
 {
-    m_image = image;
-    m_size = image.size();
-    m_hasAlpha = image.hasAlphaChannel();
+    m_pixmap = pixmap;
+    m_image = QImage();
+    m_size = pixmap.size();
+    m_hasAlpha = pixmap.hasAlphaChannel();
 }
 
 int RGBA32Buffer::width() const
diff --git a/src/3rdparty/webkit/WebCore/rendering/InlineFlowBox.cpp b/src/3rdparty/webkit/WebCore/rendering/InlineFlowBox.cpp
index 23dc4e7ba6..f83ebc60d5 100644
--- a/src/3rdparty/webkit/WebCore/rendering/InlineFlowBox.cpp
+++ b/src/3rdparty/webkit/WebCore/rendering/InlineFlowBox.cpp
@@ -288,8 +288,10 @@ int InlineFlowBox::placeBoxesHorizontally(int xPos, bool& needsWordSpacing)
             int letterSpacing = min(0, (int)rt->style(m_firstLine)->font().letterSpacing());
             rightLayoutOverflow = max(xPos + text->width() - letterSpacing, rightLayoutOverflow);
 
-            int leftGlyphOverflow = -strokeOverflow;
-            int rightGlyphOverflow = strokeOverflow - letterSpacing;
+            GlyphOverflow* glyphOverflow = static_cast<InlineTextBox*>(curr)->glyphOverflow();
+
+            int leftGlyphOverflow = -strokeOverflow - (glyphOverflow ? glyphOverflow->left : 0);
+            int rightGlyphOverflow = strokeOverflow - letterSpacing + (glyphOverflow ? glyphOverflow->right : 0);
             
             int childOverflowLeft = leftGlyphOverflow;
             int childOverflowRight = rightGlyphOverflow;
@@ -412,35 +414,35 @@ void InlineFlowBox::computeLogicalBoxHeights(int& maxPositionTop, int& maxPositi
 
         int lineHeight;
         int baseline;
-        Vector<const SimpleFontData*> usedFonts;
+        Vector<const SimpleFontData*>* usedFonts = 0;
         if (curr->isInlineTextBox())
-            static_cast<InlineTextBox*>(curr)->takeFallbackFonts(usedFonts);
+            usedFonts = static_cast<InlineTextBox*>(curr)->fallbackFonts();
 
-        if (!usedFonts.isEmpty()) {
-            usedFonts.append(curr->renderer()->style(m_firstLine)->font().primaryFont());
+        if (usedFonts) {
+            usedFonts->append(curr->renderer()->style(m_firstLine)->font().primaryFont());
             Length parentLineHeight = curr->renderer()->parent()->style()->lineHeight();
             if (parentLineHeight.isNegative()) {
                 int baselineToBottom = 0;
                 baseline = 0;
-                for (size_t i = 0; i < usedFonts.size(); ++i) {
-                    int halfLeading = (usedFonts[i]->lineSpacing() - usedFonts[i]->ascent() - usedFonts[i]->descent()) / 2;
-                    baseline = max(baseline, halfLeading + usedFonts[i]->ascent());
-                    baselineToBottom = max(baselineToBottom, usedFonts[i]->lineSpacing() - usedFonts[i]->ascent() - usedFonts[i]->descent() - halfLeading);
+                for (size_t i = 0; i < usedFonts->size(); ++i) {
+                    int halfLeading = (usedFonts->at(i)->lineSpacing() - usedFonts->at(i)->ascent() - usedFonts->at(i)->descent()) / 2;
+                    baseline = max(baseline, halfLeading + usedFonts->at(i)->ascent());
+                    baselineToBottom = max(baselineToBottom, usedFonts->at(i)->lineSpacing() - usedFonts->at(i)->ascent() - usedFonts->at(i)->descent() - halfLeading);
                 }
                 lineHeight = baseline + baselineToBottom;
             } else if (parentLineHeight.isPercent()) {
                 lineHeight = parentLineHeight.calcMinValue(curr->renderer()->style()->fontSize());
                 baseline = 0;
-                for (size_t i = 0; i < usedFonts.size(); ++i) {
-                    int halfLeading = (lineHeight - usedFonts[i]->ascent() - usedFonts[i]->descent()) / 2;
-                    baseline = max(baseline, halfLeading + usedFonts[i]->ascent());
+                for (size_t i = 0; i < usedFonts->size(); ++i) {
+                    int halfLeading = (lineHeight - usedFonts->at(i)->ascent() - usedFonts->at(i)->descent()) / 2;
+                    baseline = max(baseline, halfLeading + usedFonts->at(i)->ascent());
                 }
             } else {
                 lineHeight = parentLineHeight.value();
                 baseline = 0;
-                for (size_t i = 0; i < usedFonts.size(); ++i) {
-                    int halfLeading = (lineHeight - usedFonts[i]->ascent() - usedFonts[i]->descent()) / 2;
-                    baseline = max(baseline, halfLeading + usedFonts[i]->ascent());
+                for (size_t i = 0; i < usedFonts->size(); ++i) {
+                    int halfLeading = (lineHeight - usedFonts->at(i)->ascent() - usedFonts->at(i)->descent()) / 2;
+                    baseline = max(baseline, halfLeading + usedFonts->at(i)->ascent());
                 }
             }
         } else {
@@ -562,10 +564,12 @@ void InlineFlowBox::computeVerticalOverflow(int lineTop, int lineBottom, bool st
                 continue;
 
             int strokeOverflow = static_cast<int>(ceilf(rt->style()->textStrokeWidth() / 2.0f));
-            
-            int topGlyphOverflow = -strokeOverflow;
-            int bottomGlyphOverflow = strokeOverflow;
-            
+
+            GlyphOverflow* glyphOverflow = static_cast<InlineTextBox*>(curr)->glyphOverflow();
+
+            int topGlyphOverflow = -strokeOverflow - (glyphOverflow ? glyphOverflow->top : 0);
+            int bottomGlyphOverflow = strokeOverflow + (glyphOverflow ? glyphOverflow->bottom : 0);
+
             int childOverflowTop = topGlyphOverflow;
             int childOverflowBottom = bottomGlyphOverflow;
             for (ShadowData* shadow = rt->style()->textShadow(); shadow; shadow = shadow->next) {
diff --git a/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.cpp b/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.cpp
index 9f17b0c05d..3c0d13bc18 100644
--- a/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.cpp
+++ b/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.cpp
@@ -1029,30 +1029,48 @@ bool InlineTextBox::containsCaretOffset(int offset) const
     return true;
 }
 
-typedef HashMap<InlineTextBox*, Vector<const SimpleFontData*> > FallbackFontsMap;
-static FallbackFontsMap* gFallbackFontsMap;
-
 void InlineTextBox::setFallbackFonts(const HashSet<const SimpleFontData*>& fallbackFonts)
 {
-    if (!gFallbackFontsMap)
-        gFallbackFontsMap = new FallbackFontsMap;
+    if (!s_glyphOverflowAndFallbackFontsMap)
+        s_glyphOverflowAndFallbackFontsMap = new GlyphOverflowAndFallbackFontsMap;
 
-    FallbackFontsMap::iterator it = gFallbackFontsMap->set(this, Vector<const SimpleFontData*>()).first;
-    ASSERT(it->second.isEmpty());
-    copyToVector(fallbackFonts, it->second);
+    GlyphOverflowAndFallbackFontsMap::iterator it = s_glyphOverflowAndFallbackFontsMap->add(this, make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).first;
+    ASSERT(it->second.first.isEmpty());
+    copyToVector(fallbackFonts, it->second.first);
 }
 
-void InlineTextBox::takeFallbackFonts(Vector<const SimpleFontData*>& fallbackFonts)
+Vector<const SimpleFontData*>* InlineTextBox::fallbackFonts() const
 {
-    if (!gFallbackFontsMap)
-        return;
+    if (!s_glyphOverflowAndFallbackFontsMap)
+        return 0;
 
-    FallbackFontsMap::iterator it = gFallbackFontsMap->find(this);
-    if (it == gFallbackFontsMap->end())
-        return;
+    GlyphOverflowAndFallbackFontsMap::iterator it = s_glyphOverflowAndFallbackFontsMap->find(this);
+    if (it == s_glyphOverflowAndFallbackFontsMap->end())
+        return 0;
+
+    return &it->second.first;
+}
+
+InlineTextBox::GlyphOverflowAndFallbackFontsMap* InlineTextBox::s_glyphOverflowAndFallbackFontsMap = 0;
+
+void InlineTextBox::setGlyphOverflow(const GlyphOverflow& glyphOverflow)
+{
+    if (!s_glyphOverflowAndFallbackFontsMap)
+        s_glyphOverflowAndFallbackFontsMap = new GlyphOverflowAndFallbackFontsMap;
+
+    GlyphOverflowAndFallbackFontsMap::iterator it = s_glyphOverflowAndFallbackFontsMap->add(this, make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).first;
+    it->second.second = glyphOverflow;
+}
+
+GlyphOverflow* InlineTextBox::glyphOverflow() const
+{
+    if (!s_glyphOverflowAndFallbackFontsMap)
+        return 0;
+    GlyphOverflowAndFallbackFontsMap::iterator it = s_glyphOverflowAndFallbackFontsMap->find(this);
+    if (it == s_glyphOverflowAndFallbackFontsMap->end())
+        return 0;
 
-    fallbackFonts.swap(it->second);
-    gFallbackFontsMap->remove(it);
+    return &it->second.second;
 }
 
 } // namespace WebCore
diff --git a/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.h b/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.h
index 96ca4c3873..7a4432e9ae 100644
--- a/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.h
+++ b/src/3rdparty/webkit/WebCore/rendering/InlineTextBox.h
@@ -64,7 +64,16 @@ public:
     void offsetRun(int d) { m_start += d; }
 
     void setFallbackFonts(const HashSet<const SimpleFontData*>&);
-    void takeFallbackFonts(Vector<const SimpleFontData*>&);
+    Vector<const SimpleFontData*>* fallbackFonts() const;
+
+    void setGlyphOverflow(const GlyphOverflow&);
+    GlyphOverflow* glyphOverflow() const;
+
+    static void clearGlyphOverflowAndFallbackFontMap()
+    {
+        if (s_glyphOverflowAndFallbackFontsMap)
+            s_glyphOverflowAndFallbackFontsMap->clear();
+    }
 
     unsigned short truncation() { return m_truncation; }
 
@@ -129,6 +138,9 @@ private:
     unsigned short m_truncation; // Where to truncate when text overflow is applied.  We use special constants to
                       // denote no truncation (the whole run paints) and full truncation (nothing paints at all).
 
+    typedef HashMap<const InlineTextBox*, pair<Vector<const SimpleFontData*>, GlyphOverflow> > GlyphOverflowAndFallbackFontsMap;
+    static GlyphOverflowAndFallbackFontsMap* s_glyphOverflowAndFallbackFontsMap;
+
 protected:
     void paintCompositionBackground(GraphicsContext*, int tx, int ty, RenderStyle*, const Font&, int startPos, int endPos);
     void paintDocumentMarkers(GraphicsContext*, int tx, int ty, RenderStyle*, const Font&, bool background);
diff --git a/src/3rdparty/webkit/WebCore/rendering/RenderBlockLineLayout.cpp b/src/3rdparty/webkit/WebCore/rendering/RenderBlockLineLayout.cpp
index 6e890606c5..9ef6a23702 100644
--- a/src/3rdparty/webkit/WebCore/rendering/RenderBlockLineLayout.cpp
+++ b/src/3rdparty/webkit/WebCore/rendering/RenderBlockLineLayout.cpp
@@ -342,7 +342,8 @@ void RenderBlock::computeHorizontalPositionsForLine(RootInlineBox* lineBox, bool
                 needsWordSpacing = !isSpaceOrNewline(rt->characters()[r->m_stop - 1]) && r->m_stop == length;          
             }
             HashSet<const SimpleFontData*> fallbackFonts;
-            r->m_box->setWidth(rt->width(r->m_start, r->m_stop - r->m_start, totWidth, firstLine, &fallbackFonts));
+            GlyphOverflow glyphOverflow;
+            r->m_box->setWidth(rt->width(r->m_start, r->m_stop - r->m_start, totWidth, firstLine, &fallbackFonts, &glyphOverflow));
             if (!fallbackFonts.isEmpty()
 #if ENABLE(SVG)
                     && !isSVGText()
@@ -351,6 +352,14 @@ void RenderBlock::computeHorizontalPositionsForLine(RootInlineBox* lineBox, bool
                 ASSERT(r->m_box->isText());
                 static_cast<InlineTextBox*>(r->m_box)->setFallbackFonts(fallbackFonts);
             }
+            if ((glyphOverflow.top || glyphOverflow.bottom || glyphOverflow.left || glyphOverflow.right)
+#if ENABLE(SVG)
+                && !isSVGText()
+#endif
+            ) {
+                ASSERT(r->m_box->isText());
+                static_cast<InlineTextBox*>(r->m_box)->setGlyphOverflow(glyphOverflow);
+            }
         } else if (!r->m_object->isRenderInline()) {
             RenderBox* renderBox = toRenderBox(r->m_object);
             renderBox->calcWidth();
@@ -734,6 +743,7 @@ void RenderBlock::layoutInlineChildren(bool relayoutChildren, int& repaintTop, i
 
                         // Now position our text runs vertically.
                         computeVerticalPositionsForLine(lineBox, resolver.firstRun());
+                        InlineTextBox::clearGlyphOverflowAndFallbackFontMap();
 
 #if ENABLE(SVG)
                         // Special SVG text layout code
diff --git a/src/3rdparty/webkit/WebCore/rendering/RenderText.cpp b/src/3rdparty/webkit/WebCore/rendering/RenderText.cpp
index aa919e0fb5..307db64314 100644
--- a/src/3rdparty/webkit/WebCore/rendering/RenderText.cpp
+++ b/src/3rdparty/webkit/WebCore/rendering/RenderText.cpp
@@ -61,7 +61,7 @@ RenderText::RenderText(Node* node, PassRefPtr<StringImpl> str)
      , m_linesDirty(false)
      , m_containsReversedText(false)
      , m_isAllASCII(m_text.containsOnlyASCII())
-     , m_knownNotToUseFallbackFonts(false)
+     , m_knownToHaveNoOverflowAndNoFallbackFonts(false)
 {
     ASSERT(m_text);
 
@@ -106,7 +106,7 @@ void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyl
     // need to relayout.
     if (diff == StyleDifferenceLayout) {
         setNeedsLayoutAndPrefWidthsRecalc();
-        m_knownNotToUseFallbackFonts = false;
+        m_knownToHaveNoOverflowAndNoFallbackFonts = false;
     }
 
     ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE;
@@ -428,7 +428,7 @@ IntRect RenderText::localCaretRect(InlineBox* inlineBox, int caretOffset, int* e
     return IntRect(left, top, caretWidth, height);
 }
 
-ALWAYS_INLINE int RenderText::widthFromCache(const Font& f, int start, int len, int xPos, HashSet<const SimpleFontData*>* fallbackFonts) const
+ALWAYS_INLINE int RenderText::widthFromCache(const Font& f, int start, int len, int xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
 {
     if (f.isFixedPitch() && !f.isSmallCaps() && m_isAllASCII) {
         int monospaceCharacterWidth = f.spaceWidth();
@@ -460,7 +460,7 @@ ALWAYS_INLINE int RenderText::widthFromCache(const Font& f, int start, int len,
         return w;
     }
 
-    return f.width(TextRun(text()->characters() + start, len, allowTabs(), xPos), fallbackFonts);
+    return f.width(TextRun(text()->characters() + start, len, allowTabs(), xPos), fallbackFonts, glyphOverflow);
 }
 
 void RenderText::trimmedPrefWidths(int leadWidth,
@@ -531,7 +531,7 @@ void RenderText::trimmedPrefWidths(int leadWidth,
                 linelen++;
 
             if (linelen) {
-                endMaxW = widthFromCache(f, i, linelen, leadWidth + endMaxW, 0);
+                endMaxW = widthFromCache(f, i, linelen, leadWidth + endMaxW, 0, 0);
                 if (firstLine) {
                     firstLine = false;
                     leadWidth = 0;
@@ -576,14 +576,15 @@ int RenderText::maxPrefWidth() const
 void RenderText::calcPrefWidths(int leadWidth)
 {
     HashSet<const SimpleFontData*> fallbackFonts;
-    calcPrefWidths(leadWidth, fallbackFonts);
-    if (fallbackFonts.isEmpty())
-        m_knownNotToUseFallbackFonts = true;
+    GlyphOverflow glyphOverflow;
+    calcPrefWidths(leadWidth, fallbackFonts, glyphOverflow);
+    if (fallbackFonts.isEmpty() && !glyphOverflow.left && !glyphOverflow.right && !glyphOverflow.top && !glyphOverflow.bottom)
+        m_knownToHaveNoOverflowAndNoFallbackFonts = true;
 }
 
-void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& fallbackFonts)
+void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow)
 {
-    ASSERT(m_hasTab || prefWidthsDirty() || !m_knownNotToUseFallbackFonts);
+    ASSERT(m_hasTab || prefWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts);
 
     m_minWidth = 0;
     m_beginMinWidth = 0;
@@ -613,6 +614,8 @@ void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& f
     int nextBreakable = -1;
     int lastWordBoundary = 0;
 
+    int firstGlyphLeftOverflow = -1;
+
     bool breakNBSP = style()->autoWrap() && style()->nbspMode() == SPACE;
     bool breakAll = (style()->wordBreak() == BreakAllWordBreak || style()->wordBreak() == BreakWordBreak) && style()->autoWrap();
 
@@ -655,7 +658,9 @@ void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& f
             lastWordBoundary++;
             continue;
         } else if (c == softHyphen) {
-            currMaxWidth += widthFromCache(f, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts);
+            currMaxWidth += widthFromCache(f, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow);
+            if (firstGlyphLeftOverflow < 0)
+                firstGlyphLeftOverflow = glyphOverflow.left;
             lastWordBoundary = i + 1;
             continue;
         }
@@ -678,13 +683,15 @@ void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& f
 
         int wordLen = j - i;
         if (wordLen) {
-            int w = widthFromCache(f, i, wordLen, leadWidth + currMaxWidth, &fallbackFonts);
+            int w = widthFromCache(f, i, wordLen, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow);
+            if (firstGlyphLeftOverflow < 0)
+                firstGlyphLeftOverflow = glyphOverflow.left;
             currMinWidth += w;
             if (betweenWords) {
                 if (lastWordBoundary == i)
                     currMaxWidth += w;
                 else
-                    currMaxWidth += widthFromCache(f, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts);
+                    currMaxWidth += widthFromCache(f, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow);
                 lastWordBoundary = j;
             }
 
@@ -737,6 +744,7 @@ void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& f
                 currMaxWidth = 0;
             } else {
                 currMaxWidth += f.width(TextRun(txt + i, 1, allowTabs(), leadWidth + currMaxWidth));
+                glyphOverflow.right = 0;
                 needsWordSpacing = isSpace && !previousCharacterIsSpace && i == len - 1;
             }
             ASSERT(lastWordBoundary == i);
@@ -744,6 +752,9 @@ void RenderText::calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& f
         }
     }
 
+    if (firstGlyphLeftOverflow > 0)
+        glyphOverflow.left = firstGlyphLeftOverflow;
+
     if ((needsWordSpacing && len > 1) || (ignoringSpaces && !firstWord))
         currMaxWidth += wordSpacing;
 
@@ -1019,7 +1030,7 @@ void RenderText::setText(PassRefPtr<StringImpl> text, bool force)
 
     setTextInternal(text);
     setNeedsLayoutAndPrefWidthsRecalc();
-    m_knownNotToUseFallbackFonts = false;
+    m_knownToHaveNoOverflowAndNoFallbackFonts = false;
     
     AXObjectCache* axObjectCache = document()->axObjectCache();
     if (axObjectCache->accessibilityEnabled())
@@ -1085,7 +1096,7 @@ void RenderText::positionLineBox(InlineBox* box)
     m_containsReversedText |= s->direction() == RTL;
 }
 
-unsigned RenderText::width(unsigned from, unsigned len, int xPos, bool firstLine, HashSet<const SimpleFontData*>* fallbackFonts) const
+unsigned RenderText::width(unsigned from, unsigned len, int xPos, bool firstLine, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
 {
     if (from >= textLength())
         return 0;
@@ -1093,10 +1104,10 @@ unsigned RenderText::width(unsigned from, unsigned len, int xPos, bool firstLine
     if (from + len > textLength())
         len = textLength() - from;
 
-    return width(from, len, style(firstLine)->font(), xPos, fallbackFonts);
+    return width(from, len, style(firstLine)->font(), xPos, fallbackFonts, glyphOverflow);
 }
 
-unsigned RenderText::width(unsigned from, unsigned len, const Font& f, int xPos, HashSet<const SimpleFontData*>* fallbackFonts) const
+unsigned RenderText::width(unsigned from, unsigned len, const Font& f, int xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
 {
     ASSERT(from + len <= textLength());
     if (!characters())
@@ -1106,18 +1117,19 @@ unsigned RenderText::width(unsigned from, unsigned len, const Font& f, int xPos,
     if (&f == &style()->font()) {
         if (!style()->preserveNewline() && !from && len == textLength()) {
             if (fallbackFonts) {
-                if (prefWidthsDirty() || !m_knownNotToUseFallbackFonts) {
-                    const_cast<RenderText*>(this)->calcPrefWidths(0, *fallbackFonts);
-                    if (fallbackFonts->isEmpty())
-                        m_knownNotToUseFallbackFonts = true;
+                ASSERT(glyphOverflow);
+                if (prefWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts) {
+                    const_cast<RenderText*>(this)->calcPrefWidths(0, *fallbackFonts, *glyphOverflow);
+                    if (fallbackFonts->isEmpty() && !glyphOverflow->left && !glyphOverflow->right && !glyphOverflow->top && !glyphOverflow->bottom)
+                        m_knownToHaveNoOverflowAndNoFallbackFonts = true;
                 }
                 w = m_maxWidth;
             } else
                 w = maxPrefWidth();
         } else
-            w = widthFromCache(f, from, len, xPos, fallbackFonts);
+            w = widthFromCache(f, from, len, xPos, fallbackFonts, glyphOverflow);
     } else
-        w = f.width(TextRun(text()->characters() + from, len, allowTabs(), xPos), fallbackFonts);
+        w = f.width(TextRun(text()->characters() + from, len, allowTabs(), xPos), fallbackFonts, glyphOverflow);
 
     return w;
 }
diff --git a/src/3rdparty/webkit/WebCore/rendering/RenderText.h b/src/3rdparty/webkit/WebCore/rendering/RenderText.h
index e9ed147a4d..9b1467d459 100644
--- a/src/3rdparty/webkit/WebCore/rendering/RenderText.h
+++ b/src/3rdparty/webkit/WebCore/rendering/RenderText.h
@@ -67,8 +67,8 @@ public:
     unsigned textLength() const { return m_text.length(); } // non virtual implementation of length()
     void positionLineBox(InlineBox*);
 
-    virtual unsigned width(unsigned from, unsigned len, const Font&, int xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
-    virtual unsigned width(unsigned from, unsigned len, int xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
+    virtual unsigned width(unsigned from, unsigned len, const Font&, int xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
+    virtual unsigned width(unsigned from, unsigned len, int xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
 
     virtual int lineHeight(bool firstLine, bool isRootLineBox = false) const;
 
@@ -133,7 +133,7 @@ protected:
     virtual InlineTextBox* createTextBox(); // Subclassed by SVG.
 
 private:
-    void calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& fallbackFonts);
+    void calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&);
 
     // Make length() private so that callers that have a RenderText*
     // will use the more efficient textLength() instead, while
@@ -146,7 +146,7 @@ private:
 
     void deleteTextBoxes();
     bool containsOnlyWhitespace(unsigned from, unsigned len) const;
-    int widthFromCache(const Font&, int start, int len, int xPos, HashSet<const SimpleFontData*>* fallbackFonts) const;
+    int widthFromCache(const Font&, int start, int len, int xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const;
     bool isAllASCII() const { return m_isAllASCII; }
 
     int m_minWidth; // here to minimize padding in 64-bit.
@@ -171,7 +171,7 @@ private:
                            // or removed).
     bool m_containsReversedText : 1;
     bool m_isAllASCII : 1;
-    mutable bool m_knownNotToUseFallbackFonts : 1;
+    mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1;
 };
 
 inline RenderText* toRenderText(RenderObject* object)