C++ FontDescription::isSpecifiedFont方法代码示例

static AtomicString familyNameFromSettings(const GenericFontFamilySettings& settings, const FontDescription& fontDescription, const AtomicString& genericFamilyName)
{
    UScriptCode script = fontDescription.script();

    if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
        return settings.standard(script);

#if OS(ANDROID)
    return FontCache::getGenericFamilyNameForScript(genericFamilyName, script);
#else
    if (genericFamilyName == FontFamilyNames::webkit_serif)
        return settings.serif(script);
    if (genericFamilyName == FontFamilyNames::webkit_sans_serif)
        return settings.sansSerif(script);
    if (genericFamilyName == FontFamilyNames::webkit_cursive)
        return settings.cursive(script);
    if (genericFamilyName == FontFamilyNames::webkit_fantasy)
        return settings.fantasy(script);
    if (genericFamilyName == FontFamilyNames::webkit_monospace)
        return settings.fixed(script);
    if (genericFamilyName == FontFamilyNames::webkit_pictograph)
        return settings.pictograph(script);
    if (genericFamilyName == FontFamilyNames::webkit_standard)
        return settings.standard(script);
#endif
    return emptyAtom;
}

void FontBuilder::setFontFamilyInherit(const FontDescription& parentFontDescription)
{
    FontDescriptionChangeScope scope(this);

    scope.fontDescription().setGenericFamily(parentFontDescription.genericFamily());
    scope.fontDescription().setFamily(parentFontDescription.family());
    scope.fontDescription().setIsSpecifiedFont(parentFontDescription.isSpecifiedFont());
}

PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDescription, const AtomicString& familyName)
{
    if (m_fontFaces.isEmpty()) {
        if (familyName.startsWith("-webkit-"))
            return fontDataForGenericFamily(m_document, fontDescription, familyName);
        if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
            return fontDataForGenericFamily(m_document, fontDescription, "-webkit-standard");
        return 0;
    }

    CSSSegmentedFontFace* face = getFontFace(fontDescription, familyName);
    // If no face was found, then return 0 and let the OS come up with its best match for the name.
    if (!face) {
        // If we were handed a generic family, but there was no match, go ahead and return the correct font based off our
        // settings.
        if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
            return fontDataForGenericFamily(m_document, fontDescription, "-webkit-standard");
        return fontDataForGenericFamily(m_document, fontDescription, familyName);
    }

    // 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);
}

FontTranscoder::ConverterType FontTranscoder::converterType(const FontDescription& fontDescription, const TextEncoding* encoding) const
{
    const AtomicString& fontFamily = fontDescription.family().family().string();
    if (!fontFamily.isNull()) {
        HashMap<AtomicString, ConverterType>::const_iterator found = m_converterTypes.find(fontFamily);
        if (found != m_converterTypes.end())
            return found->second;
    }

    // IE's default fonts for Japanese encodings change backslashes into yen signs.
    // We emulate this behavior only when no font is explicitly specified.
    if (encoding && encoding->backslashAsCurrencySymbol() != '\\' && !fontDescription.isSpecifiedFont())
        return BackslashToYenSign;

    return NoConversion;
}

bool CSSFontSelector::resolvesFamilyFor(const FontDescription& description) const
{
    for (unsigned i = 0; i < description.familyCount(); ++i) {
        const AtomicString& familyName = description.familyAt(i);
        if (description.genericFamily() == FontDescription::StandardFamily && !description.isSpecifiedFont())
            return true;
        if (familyName.isEmpty())
            continue;
        if (m_fontFaces.contains(familyName))
            return true;
        DEFINE_STATIC_LOCAL(String, webkitPrefix, ("-webkit-"));
        if (familyName.startsWith(webkitPrefix))
            return true;
            
    }
    return false;
}

PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDescription, const AtomicString& familyName)
{
    if (m_fontFaces.isEmpty()) {
        if (familyName.startsWith("-webkit-"))
            return fontDataForGenericFamily(m_document, fontDescription, familyName);
        if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
            return fontDataForGenericFamily(m_document, fontDescription, "-webkit-standard");
        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.
        if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
            return fontDataForGenericFamily(m_document, fontDescription, "-webkit-standard");
        return fontDataForGenericFamily(m_document, fontDescription, familyName);
    }

    OwnPtr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace> > >& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
    if (!segmentedFontFaceCache)
        segmentedFontFaceCache = adoptPtr(new HashMap<unsigned, RefPtr<CSSSegmentedFontFace> >);

    FontTraitsMask traitsMask = fontDescription.traitsMask();

    RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, 0).iterator->value;
    if (!face) {
        face = CSSSegmentedFontFace::create(this);

        // 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;
        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);
}