void LayoutSVGInlineText::addMetricsFromRun(
const TextRun& run, bool& lastCharacterWasWhiteSpace)
{
Vector<CharacterRange> charRanges = scaledFont().individualCharacterRanges(run);
synthesizeGraphemeWidths(run, charRanges);
const float cachedFontHeight = scaledFont().getFontMetrics().floatHeight() / m_scalingFactor;
const bool preserveWhiteSpace = styleRef().whiteSpace() == PRE;
const unsigned runLength = static_cast<unsigned>(run.length());
// TODO(pdr): Character-based iteration is ambiguous and error-prone. It
// should be unified under a single concept. See: https://crbug.com/593570
unsigned characterIndex = 0;
while (characterIndex < runLength) {
bool currentCharacterIsWhiteSpace = run[characterIndex] == ' ';
if (!preserveWhiteSpace && lastCharacterWasWhiteSpace && currentCharacterIsWhiteSpace) {
m_metrics.append(SVGTextMetrics(SVGTextMetrics::SkippedSpaceMetrics));
characterIndex++;
continue;
}
unsigned length = isValidSurrogatePair(run, characterIndex) ? 2 : 1;
float width = charRanges[characterIndex].width() / m_scalingFactor;
m_metrics.append(SVGTextMetrics(length, width, cachedFontHeight));
lastCharacterWasWhiteSpace = currentCharacterIsWhiteSpace;
characterIndex += length;
}
}
bool UTF16TextIterator::consumeSurrogatePair(UChar32& character)
{
if (!U16_IS_SURROGATE(character))
return true;
if (!isValidSurrogatePair(character)) {
character = replacementCharacter;
return true;
}
UChar low = m_characters[1];
character = U16_GET_SUPPLEMENTARY(character, low);
m_currentGlyphLength = 2;
return true;
}
