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* Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
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* (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "CSSFontSelector.h"
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#include "CachedFont.h"
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#include "CSSFontFace.h"
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#include "CSSFontFaceSource.h"
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#include "CSSFontFaceSrcValue.h"
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#include "CSSPrimitiveValue.h"
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#include "CSSPropertyNames.h"
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#include "CSSSegmentedFontFace.h"
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#include "CSSUnicodeRangeValue.h"
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#include "CSSValueKeywords.h"
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#include "CSSValueList.h"
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#include "CachedResourceLoader.h"
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#include "FontCache.h"
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#include "RenderObject.h"
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#include "SimpleFontData.h"
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#include "StylePropertySet.h"
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#include "StyleResolver.h"
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#include "StyleRule.h"
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#include "WebKitFontFamilyNames.h"
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#include <wtf/text/AtomicString.h>
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#include "SVGFontFaceElement.h"
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CSSFontSelector::CSSFontSelector(Document* document)
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: m_document(document)
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, m_beginLoadingTimer(this, &CSSFontSelector::beginLoadTimerFired)
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// FIXME: An old comment used to say there was no need to hold a reference to m_document
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// because "we are guaranteed to be destroyed before the document". But there does not
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// seem to be any such guarantee.
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fontCache()->addClient(this);
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CSSFontSelector::~CSSFontSelector()
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fontCache()->removeClient(this);
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bool CSSFontSelector::isEmpty() const
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return m_fonts.isEmpty();
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void CSSFontSelector::addFontFaceRule(const StyleRuleFontFace* fontFaceRule)
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// Obtain the font-family property and the src property. Both must be defined.
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const StylePropertySet* style = fontFaceRule->properties();
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RefPtr<CSSValue> fontFamily = style->getPropertyCSSValue(CSSPropertyFontFamily);
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RefPtr<CSSValue> src = style->getPropertyCSSValue(CSSPropertySrc);
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RefPtr<CSSValue> unicodeRange = style->getPropertyCSSValue(CSSPropertyUnicodeRange);
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if (!fontFamily || !src || !fontFamily->isValueList() || !src->isValueList() || (unicodeRange && !unicodeRange->isValueList()))
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CSSValueList* familyList = static_cast<CSSValueList*>(fontFamily.get());
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if (!familyList->length())
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CSSValueList* srcList = static_cast<CSSValueList*>(src.get());
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if (!srcList->length())
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CSSValueList* rangeList = static_cast<CSSValueList*>(unicodeRange.get());
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unsigned traitsMask = 0;
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if (RefPtr<CSSValue> fontStyle = style->getPropertyCSSValue(CSSPropertyFontStyle)) {
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if (!fontStyle->isPrimitiveValue())
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switch (static_cast<CSSPrimitiveValue*>(fontStyle.get())->getIdent()) {
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traitsMask |= FontStyleNormalMask;
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case CSSValueOblique:
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traitsMask |= FontStyleItalicMask;
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traitsMask |= FontStyleNormalMask;
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if (RefPtr<CSSValue> fontWeight = style->getPropertyCSSValue(CSSPropertyFontWeight)) {
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if (!fontWeight->isPrimitiveValue())
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switch (static_cast<CSSPrimitiveValue*>(fontWeight.get())->getIdent()) {
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traitsMask |= FontWeight700Mask;
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traitsMask |= FontWeight400Mask;
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traitsMask |= FontWeight900Mask;
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traitsMask |= FontWeight800Mask;
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traitsMask |= FontWeight600Mask;
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traitsMask |= FontWeight500Mask;
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traitsMask |= FontWeight300Mask;
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traitsMask |= FontWeight200Mask;
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traitsMask |= FontWeight100Mask;
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traitsMask |= FontWeight400Mask;
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if (RefPtr<CSSValue> fontVariant = style->getPropertyCSSValue(CSSPropertyFontVariant)) {
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// font-variant descriptor can be a value list.
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if (fontVariant->isPrimitiveValue()) {
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RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
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list->append(fontVariant);
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} else if (!fontVariant->isValueList())
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CSSValueList* variantList = static_cast<CSSValueList*>(fontVariant.get());
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unsigned numVariants = variantList->length();
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for (unsigned i = 0; i < numVariants; ++i) {
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switch (static_cast<CSSPrimitiveValue*>(variantList->itemWithoutBoundsCheck(i))->getIdent()) {
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traitsMask |= FontVariantNormalMask;
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case CSSValueSmallCaps:
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traitsMask |= FontVariantSmallCapsMask;
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traitsMask |= FontVariantMask;
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// Each item in the src property's list is a single CSSFontFaceSource. Put them all into a CSSFontFace.
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RefPtr<CSSFontFace> fontFace;
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int srcLength = srcList->length();
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bool foundSVGFont = false;
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for (int i = 0; i < srcLength; i++) {
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// An item in the list either specifies a string (local font name) or a URL (remote font to download).
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CSSFontFaceSrcValue* item = static_cast<CSSFontFaceSrcValue*>(srcList->itemWithoutBoundsCheck(i));
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OwnPtr<CSSFontFaceSource> source;
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#if ENABLE(SVG_FONTS)
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foundSVGFont = item->isSVGFontFaceSrc() || item->svgFontFaceElement();
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if (!item->isLocal()) {
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Settings* settings = m_document ? m_document->frame() ? m_document->frame()->settings() : 0 : 0;
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bool allowDownloading = foundSVGFont || (settings && settings->downloadableBinaryFontsEnabled());
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if (allowDownloading && item->isSupportedFormat() && m_document) {
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CachedFont* cachedFont = item->cachedFont(m_document);
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source = adoptPtr(new CSSFontFaceSource(item->resource(), cachedFont));
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#if ENABLE(SVG_FONTS)
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source->setHasExternalSVGFont(true);
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source = adoptPtr(new CSSFontFaceSource(item->resource()));
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fontFace = CSSFontFace::create(static_cast<FontTraitsMask>(traitsMask));
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#if ENABLE(SVG_FONTS)
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source->setSVGFontFaceElement(item->svgFontFaceElement());
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fontFace->addSource(source.release());
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if (fontFace && !fontFace->isValid())
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unsigned numRanges = rangeList->length();
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for (unsigned i = 0; i < numRanges; i++) {
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CSSUnicodeRangeValue* range = static_cast<CSSUnicodeRangeValue*>(rangeList->itemWithoutBoundsCheck(i));
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fontFace->addRange(range->from(), range->to());
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// Hash under every single family name.
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int familyLength = familyList->length();
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for (int i = 0; i < familyLength; i++) {
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CSSPrimitiveValue* item = static_cast<CSSPrimitiveValue*>(familyList->itemWithoutBoundsCheck(i));
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if (item->isString())
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familyName = item->getStringValue();
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else if (item->isIdent()) {
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// We need to use the raw text for all the generic family types, since @font-face is a way of actually
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// defining what font to use for those types.
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switch (item->getIdent()) {
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familyName = serifFamily;
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case CSSValueSansSerif:
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familyName = sansSerifFamily;
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case CSSValueCursive:
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familyName = cursiveFamily;
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case CSSValueFantasy:
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familyName = fantasyFamily;
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case CSSValueMonospace:
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familyName = monospaceFamily;
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case CSSValueWebkitPictograph:
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familyName = pictographFamily;
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if (familyName.isEmpty())
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OwnPtr<Vector<RefPtr<CSSFontFace> > >& familyFontFaces = m_fontFaces.add(familyName, nullptr).iterator->value;
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if (!familyFontFaces) {
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familyFontFaces = adoptPtr(new Vector<RefPtr<CSSFontFace> >);
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ASSERT(!m_locallyInstalledFontFaces.contains(familyName));
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Vector<unsigned> locallyInstalledFontsTraitsMasks;
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fontCache()->getTraitsInFamily(familyName, locallyInstalledFontsTraitsMasks);
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if (unsigned numLocallyInstalledFaces = locallyInstalledFontsTraitsMasks.size()) {
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OwnPtr<Vector<RefPtr<CSSFontFace> > > familyLocallyInstalledFaces = adoptPtr(new Vector<RefPtr<CSSFontFace> >);
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for (unsigned i = 0; i < numLocallyInstalledFaces; ++i) {
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RefPtr<CSSFontFace> locallyInstalledFontFace = CSSFontFace::create(static_cast<FontTraitsMask>(locallyInstalledFontsTraitsMasks[i]), true);
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locallyInstalledFontFace->addSource(adoptPtr(new CSSFontFaceSource(familyName)));
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ASSERT(locallyInstalledFontFace->isValid());
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familyLocallyInstalledFaces->append(locallyInstalledFontFace);
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m_locallyInstalledFontFaces.set(familyName, familyLocallyInstalledFaces.release());
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familyFontFaces->append(fontFace);
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void CSSFontSelector::registerForInvalidationCallbacks(FontSelectorClient* client)
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m_clients.add(client);
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void CSSFontSelector::unregisterForInvalidationCallbacks(FontSelectorClient* client)
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m_clients.remove(client);
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void CSSFontSelector::dispatchInvalidationCallbacks()
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Vector<FontSelectorClient*> clients;
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copyToVector(m_clients, clients);
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for (size_t i = 0; i < clients.size(); ++i)
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clients[i]->fontsNeedUpdate(this);
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// FIXME: Make Document a FontSelectorClient so that it can simply register for invalidation callbacks.
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if (StyleResolver* styleResolver = m_document->styleResolverIfExists())
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styleResolver->invalidateMatchedPropertiesCache();
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if (m_document->inPageCache() || !m_document->renderer())
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m_document->scheduleForcedStyleRecalc();
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void CSSFontSelector::fontLoaded()
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dispatchInvalidationCallbacks();
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void CSSFontSelector::fontCacheInvalidated()
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dispatchInvalidationCallbacks();
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static PassRefPtr<FontData> fontDataForGenericFamily(Document* document, const FontDescription& fontDescription, const AtomicString& familyName)
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if (!document || !document->frame())
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const Settings* settings = document->frame()->settings();
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AtomicString genericFamily;
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UScriptCode script = fontDescription.script();
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if (familyName == serifFamily)
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genericFamily = settings->serifFontFamily(script);
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else if (familyName == sansSerifFamily)
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genericFamily = settings->sansSerifFontFamily(script);
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else if (familyName == cursiveFamily)
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genericFamily = settings->cursiveFontFamily(script);
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else if (familyName == fantasyFamily)
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genericFamily = settings->fantasyFontFamily(script);
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else if (familyName == monospaceFamily)
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genericFamily = settings->fixedFontFamily(script);
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else if (familyName == pictographFamily)
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genericFamily = settings->pictographFontFamily(script);
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else if (familyName == standardFamily)
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genericFamily = settings->standardFontFamily(script);
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if (!genericFamily.isEmpty())
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return fontCache()->getCachedFontData(fontDescription, genericFamily);
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static FontTraitsMask desiredTraitsMaskForComparison;
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static inline bool compareFontFaces(CSSFontFace* first, CSSFontFace* second)
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FontTraitsMask firstTraitsMask = first->traitsMask();
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FontTraitsMask secondTraitsMask = second->traitsMask();
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bool firstHasDesiredVariant = firstTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
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bool secondHasDesiredVariant = secondTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
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if (firstHasDesiredVariant != secondHasDesiredVariant)
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return firstHasDesiredVariant;
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// We need to check font-variant css property for CSS2.1 compatibility.
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if ((desiredTraitsMaskForComparison & FontVariantSmallCapsMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
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// Prefer a font that has indicated that it can only support small-caps to a font that claims to support
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// all variants. The specialized font is more likely to be true small-caps and not require synthesis.
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bool firstRequiresSmallCaps = (firstTraitsMask & FontVariantSmallCapsMask) && !(firstTraitsMask & FontVariantNormalMask);
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bool secondRequiresSmallCaps = (secondTraitsMask & FontVariantSmallCapsMask) && !(secondTraitsMask & FontVariantNormalMask);
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if (firstRequiresSmallCaps != secondRequiresSmallCaps)
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return firstRequiresSmallCaps;
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bool firstHasDesiredStyle = firstTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
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bool secondHasDesiredStyle = secondTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
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if (firstHasDesiredStyle != secondHasDesiredStyle)
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return firstHasDesiredStyle;
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if ((desiredTraitsMaskForComparison & FontStyleItalicMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
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// Prefer a font that has indicated that it can only support italics to a font that claims to support
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// all styles. The specialized font is more likely to be the one the author wants used.
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bool firstRequiresItalics = (firstTraitsMask & FontStyleItalicMask) && !(firstTraitsMask & FontStyleNormalMask);
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bool secondRequiresItalics = (secondTraitsMask & FontStyleItalicMask) && !(secondTraitsMask & FontStyleNormalMask);
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if (firstRequiresItalics != secondRequiresItalics)
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return firstRequiresItalics;
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if (secondTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
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if (firstTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
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// http://www.w3.org/TR/2011/WD-css3-fonts-20111004/#font-matching-algorithm says :
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// - If the desired weight is less than 400, weights below the desired weight are checked in descending order followed by weights above the desired weight in ascending order until a match is found.
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// - If the desired weight is greater than 500, weights above the desired weight are checked in ascending order followed by weights below the desired weight in descending order until a match is found.
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// - If the desired weight is 400, 500 is checked first and then the rule for desired weights less than 400 is used.
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// - If the desired weight is 500, 400 is checked first and then the rule for desired weights less than 400 is used.
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static const unsigned fallbackRuleSets = 9;
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static const unsigned rulesPerSet = 8;
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static const FontTraitsMask weightFallbackRuleSets[fallbackRuleSets][rulesPerSet] = {
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{ FontWeight200Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
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{ FontWeight100Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
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{ FontWeight200Mask, FontWeight100Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
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{ FontWeight500Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
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{ FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
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{ FontWeight700Mask, FontWeight800Mask, FontWeight900Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
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{ FontWeight800Mask, FontWeight900Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
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{ FontWeight900Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
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{ FontWeight800Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask }
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unsigned ruleSetIndex = 0;
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unsigned w = FontWeight100Bit;
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while (!(desiredTraitsMaskForComparison & (1 << w))) {
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ASSERT(ruleSetIndex < fallbackRuleSets);
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const FontTraitsMask* weightFallbackRule = weightFallbackRuleSets[ruleSetIndex];
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for (unsigned i = 0; i < rulesPerSet; ++i) {
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if (secondTraitsMask & weightFallbackRule[i])
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if (firstTraitsMask & weightFallbackRule[i])
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PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDescription, const AtomicString& familyName)
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if (m_fontFaces.isEmpty()) {
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if (familyName.startsWith("-webkit-"))
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return fontDataForGenericFamily(m_document, fontDescription, familyName);
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if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
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return fontDataForGenericFamily(m_document, fontDescription, "-webkit-standard");
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String family = familyName.string();
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Vector<RefPtr<CSSFontFace> >* familyFontFaces = m_fontFaces.get(family);
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// If no face was found, then return 0 and let the OS come up with its best match for the name.
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if (!familyFontFaces || familyFontFaces->isEmpty()) {
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// If we were handed a generic family, but there was no match, go ahead and return the correct font based off our
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if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
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return fontDataForGenericFamily(m_document, fontDescription, "-webkit-standard");
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return fontDataForGenericFamily(m_document, fontDescription, familyName);
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OwnPtr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace> > >& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
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if (!segmentedFontFaceCache)
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segmentedFontFaceCache = adoptPtr(new HashMap<unsigned, RefPtr<CSSSegmentedFontFace> >);
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FontTraitsMask traitsMask = fontDescription.traitsMask();
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RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, 0).iterator->value;
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face = CSSSegmentedFontFace::create(this);
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// Collect all matching faces and sort them in order of preference.
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Vector<CSSFontFace*, 32> candidateFontFaces;
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for (int i = familyFontFaces->size() - 1; i >= 0; --i) {
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CSSFontFace* candidate = familyFontFaces->at(i).get();
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unsigned candidateTraitsMask = candidate->traitsMask();
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if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
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if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
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#if ENABLE(SVG_FONTS)
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// For SVG Fonts that specify that they only support the "normal" variant, we will assume they are incapable
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// of small-caps synthesis and just ignore the font face as a candidate.
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if (candidate->hasSVGFontFaceSource() && (traitsMask & FontVariantSmallCapsMask) && !(candidateTraitsMask & FontVariantSmallCapsMask))
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candidateFontFaces.append(candidate);
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if (Vector<RefPtr<CSSFontFace> >* familyLocallyInstalledFontFaces = m_locallyInstalledFontFaces.get(family)) {
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unsigned numLocallyInstalledFontFaces = familyLocallyInstalledFontFaces->size();
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for (unsigned i = 0; i < numLocallyInstalledFontFaces; ++i) {
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CSSFontFace* candidate = familyLocallyInstalledFontFaces->at(i).get();
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unsigned candidateTraitsMask = candidate->traitsMask();
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if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
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if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
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candidateFontFaces.append(candidate);
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desiredTraitsMaskForComparison = traitsMask;
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stable_sort(candidateFontFaces.begin(), candidateFontFaces.end(), compareFontFaces);
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unsigned numCandidates = candidateFontFaces.size();
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for (unsigned i = 0; i < numCandidates; ++i)
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face->appendFontFace(candidateFontFaces[i]);
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// We have a face. Ask it for a font data. If it cannot produce one, it will fail, and the OS will take over.
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return face->getFontData(fontDescription);
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void CSSFontSelector::clearDocument()
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ASSERT(!m_beginLoadingTimer.isActive());
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ASSERT(m_fontsToBeginLoading.isEmpty());
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m_beginLoadingTimer.stop();
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CachedResourceLoader* cachedResourceLoader = m_document->cachedResourceLoader();
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for (size_t i = 0; i < m_fontsToBeginLoading.size(); ++i) {
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// Balances incrementRequestCount() in beginLoadingFontSoon().
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cachedResourceLoader->decrementRequestCount(m_fontsToBeginLoading[i].get());
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m_fontsToBeginLoading.clear();
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void CSSFontSelector::beginLoadingFontSoon(CachedFont* font)
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m_fontsToBeginLoading.append(font);
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// Increment the request count now, in order to prevent didFinishLoad from being dispatched
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// after this font has been requested but before it began loading. Balanced by
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// decrementRequestCount() in beginLoadTimerFired() and in clearDocument().
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m_document->cachedResourceLoader()->incrementRequestCount(font);
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m_beginLoadingTimer.startOneShot(0);
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void CSSFontSelector::beginLoadTimerFired(Timer<WebCore::CSSFontSelector>*)
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Vector<CachedResourceHandle<CachedFont> > fontsToBeginLoading;
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fontsToBeginLoading.swap(m_fontsToBeginLoading);
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// CSSFontSelector could get deleted via beginLoadIfNeeded() or loadDone() unless protected.
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RefPtr<CSSFontSelector> protect(this);
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CachedResourceLoader* cachedResourceLoader = m_document->cachedResourceLoader();
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for (size_t i = 0; i < fontsToBeginLoading.size(); ++i) {
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fontsToBeginLoading[i]->beginLoadIfNeeded(cachedResourceLoader);
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// Balances incrementRequestCount() in beginLoadingFontSoon().
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cachedResourceLoader->decrementRequestCount(fontsToBeginLoading[i].get());
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// Ensure that if the request count reaches zero, the frame loader will know about it.
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cachedResourceLoader->loadDone();
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// New font loads may be triggered by layout after the document load is complete but before we have dispatched
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// didFinishLoading for the frame. Make sure the delegate is always dispatched by checking explicitly.
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if (m_document && m_document->frame())
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m_document->frame()->loader()->checkLoadComplete();