Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 546 insertions, 0 deletions

diff --git a/Source/WebCore/css/CSSFontSelector.cpp b/Source/WebCore/css/CSSFontSelector.cpp
new file mode 100644
index 0000000..9c9a844
--- /dev/null
+++ b/Source/WebCore/css/CSSFontSelector.cpp
@@ -0,0 +1,546 @@
+/*
+ * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
+ *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "CSSFontSelector.h"
+
+#include "CachedFont.h"
+#include "CSSFontFace.h"
+#include "CSSFontFaceRule.h"
+#include "CSSFontFaceSource.h"
+#include "CSSFontFaceSrcValue.h"
+#include "CSSMutableStyleDeclaration.h"
+#include "CSSPrimitiveValue.h"
+#include "CSSPropertyNames.h"
+#include "CSSSegmentedFontFace.h"
+#include "CSSUnicodeRangeValue.h"
+#include "CSSValueKeywords.h"
+#include "CSSValueList.h"
+#include "CachedResourceLoader.h"
+#include "Document.h"
+#include "FontCache.h"
+#include "FontFamilyValue.h"
+#include "Frame.h"
+#include "RenderObject.h"
+#include "Settings.h"
+#include "SimpleFontData.h"
+#include <wtf/text/AtomicString.h>
+
+#if ENABLE(SVG)
+#include "SVGFontFaceElement.h"
+#include "SVGNames.h"
+#endif
+
+namespace WebCore {
+
+CSSFontSelector::CSSFontSelector(Document* document)
+    : m_document(document)
+{
+    // FIXME: An old comment used to say there was no need to hold a reference to m_document
+    // because "we are guaranteed to be destroyed before the document". But there does not
+    // seem to be any such guarantee.
+
+    ASSERT(m_document);
+    fontCache()->addClient(this);
+}
+
+CSSFontSelector::~CSSFontSelector()
+{
+    fontCache()->removeClient(this);
+    deleteAllValues(m_fontFaces);
+    deleteAllValues(m_locallyInstalledFontFaces);
+    deleteAllValues(m_fonts);
+}
+
+bool CSSFontSelector::isEmpty() const
+{
+    return m_fonts.isEmpty();
+}
+
+CachedResourceLoader* CSSFontSelector::cachedResourceLoader() const
+{
+    return m_document ? m_document->cachedResourceLoader() : 0;
+}
+
+void CSSFontSelector::addFontFaceRule(const CSSFontFaceRule* fontFaceRule)
+{
+    // Obtain the font-family property and the src property.  Both must be defined.
+    const CSSMutableStyleDeclaration* style = fontFaceRule->style();
+    RefPtr<CSSValue> fontFamily = style->getPropertyCSSValue(CSSPropertyFontFamily);
+    RefPtr<CSSValue> src = style->getPropertyCSSValue(CSSPropertySrc);
+    RefPtr<CSSValue> unicodeRange = style->getPropertyCSSValue(CSSPropertyUnicodeRange);
+    if (!fontFamily || !src || !fontFamily->isValueList() || !src->isValueList() || (unicodeRange && !unicodeRange->isValueList()))
+        return;
+
+    CSSValueList* familyList = static_cast<CSSValueList*>(fontFamily.get());
+    if (!familyList->length())
+        return;
+
+    CSSValueList* srcList = static_cast<CSSValueList*>(src.get());
+    if (!srcList->length())
+        return;
+
+    CSSValueList* rangeList = static_cast<CSSValueList*>(unicodeRange.get());
+
+    unsigned traitsMask = 0;
+
+    if (RefPtr<CSSValue> fontStyle = style->getPropertyCSSValue(CSSPropertyFontStyle)) {
+        if (fontStyle->isPrimitiveValue()) {
+            RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
+            list->append(fontStyle);
+            fontStyle = list;
+        } else if (!fontStyle->isValueList())
+            return;
+
+        CSSValueList* styleList = static_cast<CSSValueList*>(fontStyle.get());
+        unsigned numStyles = styleList->length();
+        if (!numStyles)
+            return;
+
+        for (unsigned i = 0; i < numStyles; ++i) {
+            switch (static_cast<CSSPrimitiveValue*>(styleList->itemWithoutBoundsCheck(i))->getIdent()) {
+                case CSSValueAll:
+                    traitsMask |= FontStyleMask;
+                    break;
+                case CSSValueNormal:
+                    traitsMask |= FontStyleNormalMask;
+                    break;
+                case CSSValueItalic:
+                case CSSValueOblique:
+                    traitsMask |= FontStyleItalicMask;
+                    break;
+                default:
+                    break;
+            }
+        }
+    } else
+        traitsMask |= FontStyleMask;
+
+    if (RefPtr<CSSValue> fontWeight = style->getPropertyCSSValue(CSSPropertyFontWeight)) {
+        if (fontWeight->isPrimitiveValue()) {
+            RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
+            list->append(fontWeight);
+            fontWeight = list;
+        } else if (!fontWeight->isValueList())
+            return;
+
+        CSSValueList* weightList = static_cast<CSSValueList*>(fontWeight.get());
+        unsigned numWeights = weightList->length();
+        if (!numWeights)
+            return;
+
+        for (unsigned i = 0; i < numWeights; ++i) {
+            switch (static_cast<CSSPrimitiveValue*>(weightList->itemWithoutBoundsCheck(i))->getIdent()) {
+                case CSSValueAll:
+                    traitsMask |= FontWeightMask;
+                    break;
+                case CSSValueBolder:
+                case CSSValueBold:
+                case CSSValue700:
+                    traitsMask |= FontWeight700Mask;
+                    break;
+                case CSSValueNormal:
+                case CSSValue400:
+                    traitsMask |= FontWeight400Mask;
+                    break;
+                case CSSValue900:
+                    traitsMask |= FontWeight900Mask;
+                    break;
+                case CSSValue800:
+                    traitsMask |= FontWeight800Mask;
+                    break;
+                case CSSValue600:
+                    traitsMask |= FontWeight600Mask;
+                    break;
+                case CSSValue500:
+                    traitsMask |= FontWeight500Mask;
+                    break;
+                case CSSValue300:
+                    traitsMask |= FontWeight300Mask;
+                    break;
+                case CSSValueLighter:
+                case CSSValue200:
+                    traitsMask |= FontWeight200Mask;
+                    break;
+                case CSSValue100:
+                    traitsMask |= FontWeight100Mask;
+                    break;
+                default:
+                    break;
+            }
+        }
+    } else
+        traitsMask |= FontWeightMask;
+
+    if (RefPtr<CSSValue> fontVariant = style->getPropertyCSSValue(CSSPropertyFontVariant)) {
+        if (fontVariant->isPrimitiveValue()) {
+            RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
+            list->append(fontVariant);
+            fontVariant = list;
+        } else if (!fontVariant->isValueList())
+            return;
+
+        CSSValueList* variantList = static_cast<CSSValueList*>(fontVariant.get());
+        unsigned numVariants = variantList->length();
+        if (!numVariants)
+            return;
+
+        for (unsigned i = 0; i < numVariants; ++i) {
+            switch (static_cast<CSSPrimitiveValue*>(variantList->itemWithoutBoundsCheck(i))->getIdent()) {
+                case CSSValueAll:
+                    traitsMask |= FontVariantMask;
+                    break;
+                case CSSValueNormal:
+                    traitsMask |= FontVariantNormalMask;
+                    break;
+                case CSSValueSmallCaps:
+                    traitsMask |= FontVariantSmallCapsMask;
+                    break;
+                default:
+                    break;
+            }
+        }
+    } else
+        traitsMask |= FontVariantMask;
+
+    // Each item in the src property's list is a single CSSFontFaceSource. Put them all into a CSSFontFace.
+    RefPtr<CSSFontFace> fontFace;
+
+    int srcLength = srcList->length();
+
+    bool foundSVGFont = false;
+
+    for (int i = 0; i < srcLength; i++) {
+        // An item in the list either specifies a string (local font name) or a URL (remote font to download).
+        CSSFontFaceSrcValue* item = static_cast<CSSFontFaceSrcValue*>(srcList->itemWithoutBoundsCheck(i));
+        CSSFontFaceSource* source = 0;
+
+#if ENABLE(SVG_FONTS)
+        foundSVGFont = item->isSVGFontFaceSrc() || item->svgFontFaceElement();
+#endif
+        if (!item->isLocal()) {
+            Settings* settings = m_document ? m_document->frame() ? m_document->frame()->settings() : 0 : 0;
+            bool allowDownloading = foundSVGFont || (settings && settings->downloadableBinaryFontsEnabled());
+            if (allowDownloading && item->isSupportedFormat() && m_document) {
+                CachedFont* cachedFont = m_document->cachedResourceLoader()->requestFont(item->resource());
+                if (cachedFont) {
+#if ENABLE(SVG_FONTS)
+                    if (foundSVGFont)
+                        cachedFont->setSVGFont(true);
+#endif
+                    source = new CSSFontFaceSource(item->resource(), cachedFont);
+                }
+            }
+        } else {
+            source = new CSSFontFaceSource(item->resource());
+        }
+
+        if (!fontFace)
+            fontFace = CSSFontFace::create(static_cast<FontTraitsMask>(traitsMask));
+
+        if (source) {
+#if ENABLE(SVG_FONTS)
+            source->setSVGFontFaceElement(item->svgFontFaceElement());
+#endif
+            fontFace->addSource(source);
+        }
+    }
+
+    ASSERT(fontFace);
+
+    if (fontFace && !fontFace->isValid())
+        return;
+
+    if (rangeList) {
+        unsigned numRanges = rangeList->length();
+        for (unsigned i = 0; i < numRanges; i++) {
+            CSSUnicodeRangeValue* range = static_cast<CSSUnicodeRangeValue*>(rangeList->itemWithoutBoundsCheck(i));
+            fontFace->addRange(range->from(), range->to());
+        }
+    }
+
+    // Hash under every single family name.
+    int familyLength = familyList->length();
+    for (int i = 0; i < familyLength; i++) {
+        CSSPrimitiveValue* item = static_cast<CSSPrimitiveValue*>(familyList->itemWithoutBoundsCheck(i));
+        String familyName;
+        if (item->primitiveType() == CSSPrimitiveValue::CSS_STRING)
+            familyName = static_cast<FontFamilyValue*>(item)->familyName();
+        else if (item->primitiveType() == CSSPrimitiveValue::CSS_IDENT) {
+            // We need to use the raw text for all the generic family types, since @font-face is a way of actually
+            // defining what font to use for those types.
+            String familyName;
+            switch (item->getIdent()) {
+                case CSSValueSerif:
+                    familyName = "-webkit-serif";
+                    break;
+                case CSSValueSansSerif:
+                    familyName = "-webkit-sans-serif";
+                    break;
+                case CSSValueCursive:
+                    familyName = "-webkit-cursive";
+                    break;
+                case CSSValueFantasy:
+                    familyName = "-webkit-fantasy";
+                    break;
+                case CSSValueMonospace:
+                    familyName = "-webkit-monospace";
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        if (familyName.isEmpty())
+            continue;
+
+        Vector<RefPtr<CSSFontFace> >* familyFontFaces = m_fontFaces.get(familyName);
+        if (!familyFontFaces) {
+            familyFontFaces = new Vector<RefPtr<CSSFontFace> >;
+            m_fontFaces.set(familyName, familyFontFaces);
+
+            ASSERT(!m_locallyInstalledFontFaces.contains(familyName));
+            Vector<RefPtr<CSSFontFace> >* familyLocallyInstalledFaces;
+
+            Vector<unsigned> locallyInstalledFontsTraitsMasks;
+            fontCache()->getTraitsInFamily(familyName, locallyInstalledFontsTraitsMasks);
+            unsigned numLocallyInstalledFaces = locallyInstalledFontsTraitsMasks.size();
+            if (numLocallyInstalledFaces) {
+                familyLocallyInstalledFaces = new Vector<RefPtr<CSSFontFace> >;
+                m_locallyInstalledFontFaces.set(familyName, familyLocallyInstalledFaces);
+
+                for (unsigned i = 0; i < numLocallyInstalledFaces; ++i) {
+                    RefPtr<CSSFontFace> locallyInstalledFontFace = CSSFontFace::create(static_cast<FontTraitsMask>(locallyInstalledFontsTraitsMasks[i]), true);
+                    locallyInstalledFontFace->addSource(new CSSFontFaceSource(familyName));
+                    ASSERT(locallyInstalledFontFace->isValid());
+                    familyLocallyInstalledFaces->append(locallyInstalledFontFace);
+                }
+            }
+        }
+
+        familyFontFaces->append(fontFace);
+    }
+}
+
+void CSSFontSelector::fontLoaded()
+{
+    if (!m_document || m_document->inPageCache() || !m_document->renderer())
+        return;
+    m_document->scheduleForcedStyleRecalc();
+}
+
+void CSSFontSelector::fontCacheInvalidated()
+{
+    if (!m_document || m_document->inPageCache() || !m_document->renderer())
+        return;
+    m_document->scheduleForcedStyleRecalc();
+}
+
+static FontData* fontDataForGenericFamily(Document* document, const FontDescription& fontDescription, const AtomicString& familyName)
+{
+    if (!document || !document->frame())
+        return 0;
+
+    const Settings* settings = document->frame()->settings();
+    if (!settings)
+        return 0;
+    
+    AtomicString genericFamily;
+    if (familyName == "-webkit-serif")
+        genericFamily = settings->serifFontFamily();
+    else if (familyName == "-webkit-sans-serif")
+        genericFamily = settings->sansSerifFontFamily();
+    else if (familyName == "-webkit-cursive")
+        genericFamily = settings->cursiveFontFamily();
+    else if (familyName == "-webkit-fantasy")
+        genericFamily = settings->fantasyFontFamily();
+    else if (familyName == "-webkit-monospace")
+        genericFamily = settings->fixedFontFamily();
+    else if (familyName == "-webkit-standard")
+        genericFamily = settings->standardFontFamily();
+
+    if (!genericFamily.isEmpty())
+        return fontCache()->getCachedFontData(fontDescription, genericFamily);
+
+    return 0;
+}
+
+static FontTraitsMask desiredTraitsMaskForComparison;
+
+static inline bool compareFontFaces(CSSFontFace* first, CSSFontFace* second)
+{
+    FontTraitsMask firstTraitsMask = first->traitsMask();
+    FontTraitsMask secondTraitsMask = second->traitsMask();
+
+    bool firstHasDesiredVariant = firstTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
+    bool secondHasDesiredVariant = secondTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
+
+    if (firstHasDesiredVariant != secondHasDesiredVariant)
+        return firstHasDesiredVariant;
+
+    if ((desiredTraitsMaskForComparison & FontVariantSmallCapsMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
+        // Prefer a font that has indicated that it can only support small-caps to a font that claims to support
+        // all variants.  The specialized font is more likely to be true small-caps and not require synthesis.
+        bool firstRequiresSmallCaps = (firstTraitsMask & FontVariantSmallCapsMask) && !(firstTraitsMask & FontVariantNormalMask);
+        bool secondRequiresSmallCaps = (secondTraitsMask & FontVariantSmallCapsMask) && !(secondTraitsMask & FontVariantNormalMask);
+        if (firstRequiresSmallCaps != secondRequiresSmallCaps)
+            return firstRequiresSmallCaps;
+    }
+
+    bool firstHasDesiredStyle = firstTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
+    bool secondHasDesiredStyle = secondTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
+
+    if (firstHasDesiredStyle != secondHasDesiredStyle)
+        return firstHasDesiredStyle;
+
+    if ((desiredTraitsMaskForComparison & FontStyleItalicMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
+        // Prefer a font that has indicated that it can only support italics to a font that claims to support
+        // all styles.  The specialized font is more likely to be the one the author wants used.
+        bool firstRequiresItalics = (firstTraitsMask & FontStyleItalicMask) && !(firstTraitsMask & FontStyleNormalMask);
+        bool secondRequiresItalics = (secondTraitsMask & FontStyleItalicMask) && !(secondTraitsMask & FontStyleNormalMask);
+        if (firstRequiresItalics != secondRequiresItalics)
+            return firstRequiresItalics;
+    }
+
+    if (secondTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
+        return false;
+    if (firstTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
+        return true;
+
+    // http://www.w3.org/TR/2002/WD-css3-webfonts-20020802/#q46 says: "If there are fewer then 9 weights in the family, the default algorithm
+    // for filling the "holes" is as follows. If '500' is unassigned, it will be assigned the same font as '400'. If any of the values '600',
+    // '700', '800', or '900' remains unassigned, they are assigned to the same face as the next darker assigned keyword, if any, or the next
+    // lighter one otherwise. If any of '300', '200', or '100' remains unassigned, it is assigned to the next lighter assigned keyword, if any,
+    // or the next darker otherwise."
+    // For '400', we made up our own rule (which then '500' follows).
+
+    static const unsigned fallbackRuleSets = 9;
+    static const unsigned rulesPerSet = 8;
+    static const FontTraitsMask weightFallbackRuleSets[fallbackRuleSets][rulesPerSet] = {
+        { FontWeight200Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
+        { FontWeight100Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
+        { FontWeight200Mask, FontWeight100Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
+        { FontWeight500Mask, FontWeight300Mask, FontWeight600Mask, FontWeight200Mask, FontWeight700Mask, FontWeight100Mask, FontWeight800Mask, FontWeight900Mask },
+        { FontWeight400Mask, FontWeight300Mask, FontWeight600Mask, FontWeight200Mask, FontWeight700Mask, FontWeight100Mask, FontWeight800Mask, FontWeight900Mask },
+        { FontWeight700Mask, FontWeight800Mask, FontWeight900Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
+        { FontWeight800Mask, FontWeight900Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
+        { FontWeight900Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
+        { FontWeight800Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask }
+    };
+
+    unsigned ruleSetIndex = 0;
+    unsigned w = FontWeight100Bit;
+    while (!(desiredTraitsMaskForComparison & (1 << w))) {
+        w++;
+        ruleSetIndex++;
+    }
+
+    ASSERT(ruleSetIndex < fallbackRuleSets);
+    const FontTraitsMask* weightFallbackRule = weightFallbackRuleSets[ruleSetIndex];
+    for (unsigned i = 0; i < rulesPerSet; ++i) {
+        if (secondTraitsMask & weightFallbackRule[i])
+            return false;
+        if (firstTraitsMask & weightFallbackRule[i])
+            return true;
+    }
+
+    return false;
+}
+
+FontData* CSSFontSelector::getFontData(const FontDescription& fontDescription, const AtomicString& familyName)
+{
+    if (m_fontFaces.isEmpty()) {
+        if (familyName.startsWith("-webkit-"))
+            return fontDataForGenericFamily(m_document, fontDescription, familyName);
+        return 0;
+    }
+
+    String family = familyName.string();
+
+    Vector<RefPtr<CSSFontFace> >* familyFontFaces = m_fontFaces.get(family);
+    // If no face was found, then return 0 and let the OS come up with its best match for the name.
+    if (!familyFontFaces || familyFontFaces->isEmpty()) {
+        // If we were handed a generic family, but there was no match, go ahead and return the correct font based off our
+        // settings.
+        return fontDataForGenericFamily(m_document, fontDescription, familyName);
+    }
+
+    HashMap<unsigned, RefPtr<CSSSegmentedFontFace> >* segmentedFontFaceCache = m_fonts.get(family);
+    if (!segmentedFontFaceCache) {
+        segmentedFontFaceCache = new HashMap<unsigned, RefPtr<CSSSegmentedFontFace> >;
+        m_fonts.set(family, segmentedFontFaceCache);
+    }
+
+    FontTraitsMask traitsMask = fontDescription.traitsMask();
+
+    RefPtr<CSSSegmentedFontFace> face = segmentedFontFaceCache->get(traitsMask);
+
+    if (!face) {
+        face = CSSSegmentedFontFace::create(this);
+        segmentedFontFaceCache->set(traitsMask, face);
+        // Collect all matching faces and sort them in order of preference.
+        Vector<CSSFontFace*, 32> candidateFontFaces;
+        for (int i = familyFontFaces->size() - 1; i >= 0; --i) {
+            CSSFontFace* candidate = familyFontFaces->at(i).get();
+            unsigned candidateTraitsMask = candidate->traitsMask();
+            if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
+                continue;
+            if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
+                continue;
+#if ENABLE(SVG_FONTS)
+            // For SVG Fonts that specify that they only support the "normal" variant, we will assume they are incapable
+            // of small-caps synthesis and just ignore the font face as a candidate.
+            if (candidate->hasSVGFontFaceSource() && (traitsMask & FontVariantSmallCapsMask) && !(candidateTraitsMask & FontVariantSmallCapsMask))
+                continue;
+#endif
+            candidateFontFaces.append(candidate);
+        }
+
+        if (Vector<RefPtr<CSSFontFace> >* familyLocallyInstalledFontFaces = m_locallyInstalledFontFaces.get(family)) {
+            unsigned numLocallyInstalledFontFaces = familyLocallyInstalledFontFaces->size();
+            for (unsigned i = 0; i < numLocallyInstalledFontFaces; ++i) {
+                CSSFontFace* candidate = familyLocallyInstalledFontFaces->at(i).get();
+                unsigned candidateTraitsMask = candidate->traitsMask();
+                if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
+                    continue;
+                if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
+                    continue;
+                candidateFontFaces.append(candidate);
+            }
+        }
+
+        desiredTraitsMaskForComparison = traitsMask;
+        std::stable_sort(candidateFontFaces.begin(), candidateFontFaces.end(), compareFontFaces);
+        unsigned numCandidates = candidateFontFaces.size();
+        for (unsigned i = 0; i < numCandidates; ++i)
+            face->appendFontFace(candidateFontFaces[i]);
+    }
+
+    // We have a face.  Ask it for a font data.  If it cannot produce one, it will fail, and the OS will take over.
+    return face->getFontData(fontDescription);
+}
+
+}