bool SVGGlyphRefElement::hasValidGlyphElement(AtomicString& glyphName) const
{
// FIXME: We only support xlink:href so far.
// https://bugs.webkit.org/show_bug.cgi?id=64787
Element* element = targetElementFromIRIString(getAttribute(XLinkNames::hrefAttr), document(), &glyphName);
return isSVGGlyphElement(element);
}
void SVGFontElement::ensureGlyphCache()
{
if (m_isGlyphCacheValid)
return;
KerningPairVector horizontalKerningPairs;
KerningPairVector verticalKerningPairs;
SVGMissingGlyphElement* firstMissingGlyphElement = 0;
Vector<String> ligatures;
for (SVGElement* element = Traversal<SVGElement>::firstChild(*this); element; element = Traversal<SVGElement>::nextSibling(*element)) {
if (isSVGGlyphElement(*element)) {
SVGGlyphElement& glyph = toSVGGlyphElement(*element);
AtomicString unicode = glyph.fastGetAttribute(SVGNames::unicodeAttr);
AtomicString glyphId = glyph.getIdAttribute();
if (glyphId.isEmpty() && unicode.isEmpty())
continue;
m_glyphMap.addGlyph(glyphId, unicode, glyph.buildGlyphIdentifier());
// Register ligatures, if needed, don't mix up with surrogate pairs though!
if (unicode.length() > 1 && !U16_IS_SURROGATE(unicode[0]))
ligatures.append(unicode.string());
} else if (isSVGHKernElement(*element)) {
toSVGHKernElement(*element).buildHorizontalKerningPair(horizontalKerningPairs);
} else if (isSVGVKernElement(*element)) {
toSVGVKernElement(*element).buildVerticalKerningPair(verticalKerningPairs);
} else if (isSVGMissingGlyphElement(*element) && !firstMissingGlyphElement) {
firstMissingGlyphElement = toSVGMissingGlyphElement(element);
}
}
// Build the kerning tables.
buildKerningTable(horizontalKerningPairs, m_horizontalKerningTable);
buildKerningTable(verticalKerningPairs, m_verticalKerningTable);
// The glyph-name->glyph-id map won't be needed/used after having built the kerning table(s).
m_glyphMap.dropNamedGlyphMap();
// Register each character of each ligature, if needed.
if (!ligatures.isEmpty())
registerLigaturesInGlyphCache(ligatures);
// Register missing-glyph element, if present.
if (firstMissingGlyphElement) {
SVGGlyph svgGlyph = SVGGlyphElement::buildGenericGlyphIdentifier(firstMissingGlyphElement);
m_glyphMap.appendToGlyphTable(svgGlyph);
m_missingGlyph = svgGlyph.tableEntry;
ASSERT(m_missingGlyph > 0);
}
m_isGlyphCacheValid = true;
}
bool SVGAltGlyphElement::hasValidGlyphElements(Vector<AtomicString>& glyphNames) const
{
AtomicString target;
Element* element = targetElementFromIRIString(getAttribute(XLinkNames::hrefAttr), treeScope(), &target);
if (!element)
return false;
if (isSVGGlyphElement(*element)) {
glyphNames.append(target);
return true;
}
if (isSVGAltGlyphDefElement(*element) && toSVGAltGlyphDefElement(*element).hasValidGlyphElements(glyphNames))
return true;
return false;
}
void SVGFontElement::ensureGlyphCache()
{
if (m_isGlyphCacheValid)
return;
const SVGMissingGlyphElement* firstMissingGlyphElement = nullptr;
Vector<String> ligatures;
for (auto& child : childrenOfType<SVGElement>(*this)) {
if (isSVGGlyphElement(child)) {
SVGGlyphElement& glyph = toSVGGlyphElement(child);
AtomicString unicode = glyph.fastGetAttribute(SVGNames::unicodeAttr);
AtomicString glyphId = glyph.getIdAttribute();
if (glyphId.isEmpty() && unicode.isEmpty())
continue;
m_glyphMap.addGlyph(glyphId, unicode, glyph.buildGlyphIdentifier());
// Register ligatures, if needed, don't mix up with surrogate pairs though!
if (unicode.length() > 1 && !U16_IS_SURROGATE(unicode[0]))
ligatures.append(unicode.string());
} else if (isSVGHKernElement(child)) {
SVGHKernElement& hkern = toSVGHKernElement(child);
hkern.buildHorizontalKerningPair(m_horizontalKerningMap);
} else if (isSVGVKernElement(child)) {
SVGVKernElement& vkern = toSVGVKernElement(child);
vkern.buildVerticalKerningPair(m_verticalKerningMap);
} else if (isSVGMissingGlyphElement(child) && !firstMissingGlyphElement)
firstMissingGlyphElement = &toSVGMissingGlyphElement(child);
}
// Register each character of each ligature, if needed.
if (!ligatures.isEmpty())
registerLigaturesInGlyphCache(ligatures);
// Register missing-glyph element, if present.
if (firstMissingGlyphElement) {
SVGGlyph svgGlyph = SVGGlyphElement::buildGenericGlyphIdentifier(firstMissingGlyphElement);
m_glyphMap.appendToGlyphTable(svgGlyph);
m_missingGlyph = svgGlyph.tableEntry;
ASSERT(m_missingGlyph > 0);
}
m_isGlyphCacheValid = true;
}
