示例#1
0
    void walk(const TextRun& run, bool isVerticalText, const String& language, int from, int to)
    {
        // Should hold true for SVG text, otherwhise sth. is wrong
        ASSERT(to - from == run.length());

        Vector<SVGGlyphIdentifier::ArabicForm> chars(charactersWithArabicForm(String(run.data(from), run.length()), run.rtl()));

        SVGGlyphIdentifier identifier;
        bool foundGlyph = false;
        int characterLookupRange;
        int endOfScanRange = to + m_walkerData.extraCharsAvailable;

        bool haveAltGlyph = false;
        SVGGlyphIdentifier altGlyphIdentifier;
        if (RenderObject* renderObject = run.referencingRenderObject()) {
            if (renderObject->element() && renderObject->element()->hasTagName(SVGNames::altGlyphTag)) {
                SVGGlyphElement* glyphElement = static_cast<SVGAltGlyphElement*>(renderObject->element())->glyphElement();
                if (glyphElement) {
                    haveAltGlyph = true;
                    altGlyphIdentifier = glyphElement->buildGlyphIdentifier();
                    altGlyphIdentifier.isValid = true;
                    altGlyphIdentifier.nameLength = to - from;
                }
            }
        }

        for (int i = from; i < to; ++i) {
            // If characterLookupRange is > 0, then the font defined ligatures (length of unicode property value > 1).
            // We have to check wheter the current character & the next character define a ligature. This needs to be
            // extended to the n-th next character (where n is 'characterLookupRange'), to check for any possible ligature.
            characterLookupRange = endOfScanRange - i;

            String lookupString(run.data(i), characterLookupRange);
            Vector<SVGGlyphIdentifier> glyphs;
            if (haveAltGlyph)
                glyphs.append(altGlyphIdentifier);
            else
                m_fontElement->getGlyphIdentifiersForString(lookupString, glyphs);

            Vector<SVGGlyphIdentifier>::iterator it = glyphs.begin();
            Vector<SVGGlyphIdentifier>::iterator end = glyphs.end();
            
            for (; it != end; ++it) {
                identifier = *it;
                if (identifier.isValid && isCompatibleGlyph(identifier, isVerticalText, language, chars, i, i + identifier.nameLength)) {
                    ASSERT(characterLookupRange > 0);
                    i += identifier.nameLength - 1;
                    m_walkerData.charsConsumed += identifier.nameLength;
                    m_walkerData.glyphName = identifier.glyphName;

                    foundGlyph = true;
                    SVGGlyphElement::inheritUnspecifiedAttributes(identifier, m_fontData);
                    break;
                }
            }

            if (!foundGlyph) {
                ++m_walkerData.charsConsumed;
                if (SVGMissingGlyphElement* element = m_fontElement->firstMissingGlyphElement()) {
                    // <missing-glyph> element support
                    identifier = SVGGlyphElement::buildGenericGlyphIdentifier(element);
                    SVGGlyphElement::inheritUnspecifiedAttributes(identifier, m_fontData);
                    identifier.isValid = true;
                } else {
                    // Fallback to system font fallback
                    TextRun subRun(run);
                    subRun.setText(subRun.data(i), 1);

                    (*m_walkerMissingGlyphCallback)(subRun, m_walkerData);
                    continue;
                }
            }

            if (!(*m_walkerCallback)(identifier, m_walkerData))
                break;

            foundGlyph = false;
        }
    }
示例#2
0
bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& glyphData, bool mirror, int currentCharacter, unsigned& advanceLength, String& normalizedSpacesStringCache) const
{
    const TextRun& run = iterator.run();
    Vector<SVGGlyph::ArabicForm>& arabicForms = iterator.arabicForms();
    ASSERT(run.charactersLength() >= static_cast<unsigned>(currentCharacter));

    SVGFontFaceElement* svgFontFaceElement = this->svgFontFaceElement();
    ASSERT(svgFontFaceElement);

    SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement();
    ASSERT(associatedFontElement);

    RenderObject* renderObject = nullptr;
    if (TextRun::RenderingContext* renderingContext = run.renderingContext())
        renderObject = &static_cast<SVGTextRunRenderingContext*>(renderingContext)->renderer();

    String language;
    bool isVerticalText = false;
    Vector<String> altGlyphNames;

    if (renderObject) {
        RenderElement& parentRenderer = is<RenderElement>(*renderObject) ? downcast<RenderElement>(*renderObject) : *renderObject->parent();

        isVerticalText = parentRenderer.style().svgStyle().isVerticalWritingMode();
        if (Element* parentRendererElement = parentRenderer.element()) {
            language = parentRendererElement->getAttribute(XMLNames::langAttr);

            if (is<SVGAltGlyphElement>(*parentRendererElement)) {
                SVGAltGlyphElement& altGlyph = downcast<SVGAltGlyphElement>(*parentRendererElement);
                if (!altGlyph.hasValidGlyphElements(altGlyphNames))
                    altGlyphNames.clear();
            }
        }
    }

    Vector<SVGGlyph> glyphs;
    size_t altGlyphNamesSize = altGlyphNames.size();
    if (altGlyphNamesSize) {
        for (size_t index = 0; index < altGlyphNamesSize; ++index)
            associatedFontElement->collectGlyphsForGlyphName(altGlyphNames[index], glyphs);

        // Assign the unicodeStringLength now that its known.
        size_t glyphsSize = glyphs.size();
        for (size_t i = 0; i < glyphsSize; ++i)
            glyphs[i].unicodeStringLength = run.length();

        // Do not check alt glyphs for compatibility. Just return the first one.
        // Later code will fail if we do not do this and the glyph is incompatible.
        if (glyphsSize) {
            SVGGlyph& svgGlyph = glyphs[0];
            iterator.setLastGlyphName(svgGlyph.glyphName);
            glyphData.glyph = svgGlyph.tableEntry;
            advanceLength = svgGlyph.unicodeStringLength;
            return true;
        }
    } else {
        // Associate text with arabic forms, if needed.
        computeNormalizedSpaces(run, mirror, normalizedSpacesStringCache);
        auto remainingTextInRun = normalizedSpacesStringCache.substring(currentCharacter);

        if (!currentCharacter && arabicForms.isEmpty())
            arabicForms = charactersWithArabicForm(remainingTextInRun, mirror);

        associatedFontElement->collectGlyphsForString(remainingTextInRun, glyphs);
    }

    size_t glyphsSize = glyphs.size();
    for (size_t i = 0; i < glyphsSize; ++i) {
        SVGGlyph& svgGlyph = glyphs[i];
        if (svgGlyph.isPartOfLigature)
            continue;
        if (!isCompatibleGlyph(svgGlyph, isVerticalText, language, arabicForms, currentCharacter, currentCharacter + svgGlyph.unicodeStringLength))
            continue;
        iterator.setLastGlyphName(svgGlyph.glyphName);
        glyphData.glyph = svgGlyph.tableEntry;
        advanceLength = svgGlyph.unicodeStringLength;
        return true;
    }

    iterator.setLastGlyphName(String());
    return false;
}
示例#3
0
bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& glyphData, bool mirror, int currentCharacter, unsigned& advanceLength) const
{
    const TextRun& run = iterator.run();
    Vector<SVGGlyph::ArabicForm>& arabicForms = iterator.arabicForms();
    ASSERT(int(run.charactersLength()) >= currentCharacter);

    // Associate text with arabic forms, if needed.
    String remainingTextInRun(run.data16(currentCharacter), run.charactersLength() - currentCharacter);
    remainingTextInRun = Font::normalizeSpaces(remainingTextInRun.characters(), remainingTextInRun.length());
    if (mirror)
        remainingTextInRun = createStringWithMirroredCharacters(remainingTextInRun.characters(), remainingTextInRun.length());
    if (!currentCharacter && arabicForms.isEmpty())
        arabicForms = charactersWithArabicForm(remainingTextInRun, mirror);

    SVGFontFaceElement* svgFontFaceElement = this->svgFontFaceElement();
    ASSERT(svgFontFaceElement);

    SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement();
    ASSERT(associatedFontElement);

    RenderObject* renderObject = 0;
    if (TextRun::RenderingContext* renderingContext = run.renderingContext())
        renderObject = static_cast<SVGTextRunRenderingContext*>(renderingContext)->renderer();

    String language;
    bool isVerticalText = false;
    Vector<String> altGlyphNames;

    if (renderObject) {
        RenderObject* parentRenderObject = renderObject->isText() ? renderObject->parent() : renderObject;
        ASSERT(parentRenderObject);

        isVerticalText = parentRenderObject->style()->svgStyle()->isVerticalWritingMode();
        if (Element* parentRenderObjectElement = toElement(parentRenderObject->node())) {
            language = parentRenderObjectElement->getAttribute(XMLNames::langAttr);

            if (parentRenderObjectElement->hasTagName(SVGNames::altGlyphTag)) {
                SVGAltGlyphElement* altGlyph = static_cast<SVGAltGlyphElement*>(parentRenderObjectElement);
                if (!altGlyph->hasValidGlyphElements(altGlyphNames))
                    altGlyphNames.clear();
            }
        }
    }

    Vector<SVGGlyph> glyphs;
    size_t altGlyphNamesSize = altGlyphNames.size();
    if (altGlyphNamesSize) {
        for (size_t index = 0; index < altGlyphNamesSize; ++index)
            associatedFontElement->collectGlyphsForGlyphName(altGlyphNames[index], glyphs);

        // Assign the unicodeStringLength now that its known.
        size_t glyphsSize = glyphs.size();
        for (size_t i = 0; i < glyphsSize; ++i)
            glyphs[i].unicodeStringLength = run.length();
    } else
        associatedFontElement->collectGlyphsForString(remainingTextInRun, glyphs);

    size_t glyphsSize = glyphs.size();
    for (size_t i = 0; i < glyphsSize; ++i) {
        SVGGlyph& svgGlyph = glyphs[i];
        if (svgGlyph.isPartOfLigature)
            continue;
        if (!isCompatibleGlyph(svgGlyph, isVerticalText, language, arabicForms, currentCharacter, currentCharacter + svgGlyph.unicodeStringLength))
            continue;
        iterator.setLastGlyphName(svgGlyph.glyphName);
        glyphData.glyph = svgGlyph.tableEntry;
        advanceLength = svgGlyph.unicodeStringLength;
        return true;
    }

    iterator.setLastGlyphName(String());
    return false;
}