C++ FontDescription::script方法代码示例

void FontBuilder::createFontForDocument(PassRefPtr<FontSelector> fontSelector, RenderStyle* documentStyle)
{
    FontDescription fontDescription = FontDescription();
    fontDescription.setScript(localeToScriptCodeForFontSelection(documentStyle->locale()));
    if (Settings* settings = m_document->settings()) {
        fontDescription.setUsePrinterFont(m_document->printing());
        const AtomicString& standardFont = settings->standardFontFamily(fontDescription.script());
        if (!standardFont.isEmpty()) {
            fontDescription.setGenericFamily(FontDescription::StandardFamily);
            fontDescription.firstFamily().setFamily(standardFont);
            fontDescription.firstFamily().appendFamily(0);
        }
        fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
        int size = FontSize::fontSizeForKeyword(m_document, CSSValueMedium, false);
        fontDescription.setSpecifiedSize(size);
        fontDescription.setComputedSize(getComputedSizeFromSpecifiedSize(fontDescription, documentStyle->effectiveZoom(), size));
    } else {
        fontDescription.setUsePrinterFont(m_document->printing());
    }

    FontOrientation fontOrientation;
    NonCJKGlyphOrientation glyphOrientation;
    getFontAndGlyphOrientation(documentStyle, fontOrientation, glyphOrientation);
    fontDescription.setOrientation(fontOrientation);
    fontDescription.setNonCJKGlyphOrientation(glyphOrientation);
    documentStyle->setFontDescription(fontDescription);
    documentStyle->font().update(fontSelector);
}

static PassRefPtr<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;
    UScriptCode script = fontDescription.script();

    if (familyName == serifFamily)
         genericFamily = settings->serifFontFamily(script);
    else if (familyName == sansSerifFamily)
         genericFamily = settings->sansSerifFontFamily(script);
    else if (familyName == cursiveFamily)
         genericFamily = settings->cursiveFontFamily(script);
    else if (familyName == fantasyFamily)
         genericFamily = settings->fantasyFontFamily(script);
    else if (familyName == monospaceFamily)
         genericFamily = settings->fixedFontFamily(script);
    else if (familyName == pictographFamily)
         genericFamily = settings->pictographFontFamily(script);
    else if (familyName == standardFamily)
         genericFamily = settings->standardFontFamily(script);

    if (!genericFamily.isEmpty())
        return fontCache()->getFontResourceData(fontDescription, genericFamily);

    return 0;
}

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

#if OS(ANDROID)
    if (fontDescription.genericFamily() == FontDescription::StandardFamily)
        return FontCache::getGenericFamilyNameForScript(FontFamilyNames::webkit_standard, script);

    if (genericFamilyName.startsWith("-webkit-"))
        return FontCache::getGenericFamilyNameForScript(genericFamilyName, script);
#else
    if (fontDescription.genericFamily() == FontDescription::StandardFamily)
        return settings.standard(script);
    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;
}

PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
{
    AtomicString familyName = getFamilyNameForCharacter(c, fontDescription.script());
    if (familyName.isEmpty())
        return getLastResortFallbackFont(fontDescription, DoNotRetain);
    return fontDataFromFontPlatformData(getFontPlatformData(fontDescription, FontFaceCreationParams(familyName)), DoNotRetain);
}

// static
AtomicString FontCache::getGenericFamilyNameForScript(const AtomicString& familyName, const FontDescription& fontDescription)
{
    // This is a hack to use the preferred font for CJK scripts.
    // FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts.
    UChar32 examplerChar;
    switch (fontDescription.script()) {
    case USCRIPT_SIMPLIFIED_HAN:
    case USCRIPT_TRADITIONAL_HAN:
    case USCRIPT_KATAKANA_OR_HIRAGANA:
        examplerChar = 0x4E00; // A common character in Japanese and Chinese.
        break;
    case USCRIPT_HANGUL:
        examplerChar = 0xAC00;
        break;
    default:
        // For other scripts, use the default generic family mapping logic.
        return familyName;
    }

    RefPtr<SkFontMgr> fm = adoptRef(SkFontMgr::RefDefault());
    return getFamilyNameForCharacter(fm.get(), examplerChar, fontDescription, FontFallbackPriority::Text);
}

PassRef<RenderStyle> resolveForDocument(const Document& document)
{
    ASSERT(document.hasLivingRenderTree());

    RenderView& renderView = *document.renderView();

    // HTML5 states that seamless iframes should replace default CSS values
    // with values inherited from the containing iframe element. However,
    // some values (such as the case of designMode = "on") still need to
    // be set by this "document style".
    auto documentStyle = RenderStyle::create();
    bool seamlessWithParent = document.shouldDisplaySeamlesslyWithParent();
    if (seamlessWithParent) {
        RenderStyle* iframeStyle = document.seamlessParentIFrame()->renderStyle();
        if (iframeStyle)
            documentStyle.get().inheritFrom(iframeStyle);
    }

    // FIXME: It's not clear which values below we want to override in the seamless case!
    documentStyle.get().setDisplay(BLOCK);
    if (!seamlessWithParent) {
        documentStyle.get().setRTLOrdering(document.visuallyOrdered() ? VisualOrder : LogicalOrder);
        documentStyle.get().setZoom(!document.printing() ? renderView.frame().pageZoomFactor() : 1);
        documentStyle.get().setPageScaleTransform(renderView.frame().frameScaleFactor());
        documentStyle.get().setLocale(document.contentLanguage());
    }
    // This overrides any -webkit-user-modify inherited from the parent iframe.
    documentStyle.get().setUserModify(document.inDesignMode() ? READ_WRITE : READ_ONLY);

    Element* docElement = document.documentElement();
    RenderObject* docElementRenderer = docElement ? docElement->renderer() : 0;
    if (docElementRenderer) {
        // Use the direction and writing-mode of the body to set the
        // viewport's direction and writing-mode unless the property is set on the document element.
        // If there is no body, then use the document element.
        RenderObject* bodyRenderer = document.body() ? document.body()->renderer() : 0;
        if (bodyRenderer && !document.writingModeSetOnDocumentElement())
            documentStyle.get().setWritingMode(bodyRenderer->style()->writingMode());
        else
            documentStyle.get().setWritingMode(docElementRenderer->style()->writingMode());
        if (bodyRenderer && !document.directionSetOnDocumentElement())
            documentStyle.get().setDirection(bodyRenderer->style()->direction());
        else
            documentStyle.get().setDirection(docElementRenderer->style()->direction());
    }

    const Pagination& pagination = renderView.frameView().pagination();
    if (pagination.mode != Pagination::Unpaginated) {
        documentStyle.get().setColumnStylesFromPaginationMode(pagination.mode);
        documentStyle.get().setColumnGap(pagination.gap);
        if (renderView.hasColumns())
            renderView.updateColumnInfoFromStyle(&documentStyle.get());
    }

    // Seamless iframes want to inherit their font from their parent iframe, so early return before setting the font.
    if (seamlessWithParent)
        return documentStyle;

    const Settings& settings = renderView.frame().settings();

    FontDescription fontDescription;
    fontDescription.setScript(localeToScriptCodeForFontSelection(documentStyle.get().locale()));
    fontDescription.setUsePrinterFont(document.printing() || !settings.screenFontSubstitutionEnabled());
    fontDescription.setRenderingMode(settings.fontRenderingMode());
    const AtomicString& standardFont = settings.standardFontFamily(fontDescription.script());
    if (!standardFont.isEmpty()) {
        fontDescription.setGenericFamily(FontDescription::StandardFamily);
        fontDescription.setOneFamily(standardFont);
    }
    fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
    int size = fontSizeForKeyword(CSSValueMedium, false, document);
    fontDescription.setSpecifiedSize(size);
    bool useSVGZoomRules = document.isSVGDocument();
    fontDescription.setComputedSize(computedFontSizeFromSpecifiedSize(size, fontDescription.isAbsoluteSize(), useSVGZoomRules, &documentStyle.get(), document));

    FontOrientation fontOrientation;
    NonCJKGlyphOrientation glyphOrientation;
    documentStyle.get().getFontAndGlyphOrientation(fontOrientation, glyphOrientation);
    fontDescription.setOrientation(fontOrientation);
    fontDescription.setNonCJKGlyphOrientation(glyphOrientation);

    documentStyle.get().setFontDescription(fontDescription);

    CSSFontSelector* fontSelector = document.styleResolverIfExists() ? document.styleResolverIfExists()->fontSelector() : 0;
    documentStyle.get().font().update(fontSelector);

    return documentStyle;
}