diff options
| -rw-r--r-- | src/gui/text/qtextengine.cpp | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp index 025d4289aa..82cff6a043 100644 --- a/src/gui/text/qtextengine.cpp +++ b/src/gui/text/qtextengine.cpp @@ -1015,10 +1015,22 @@ void QTextEngine::shapeTextWithHarfbuzz(int item) const casedString.resize(entire_shaper_item.item.length); HB_UChar16 *uc = casedString.data(); for (uint i = 0; i < entire_shaper_item.item.length; ++i) { - if(si.analysis.flags == QScriptAnalysis::Lowercase) - uc[i] = QChar::toLower(entire_shaper_item.string[si.position + i]); - else - uc[i] = QChar::toUpper(entire_shaper_item.string[si.position + i]); + uint ucs4 = entire_shaper_item.string[si.position + i]; + if (QChar::isHighSurrogate(ucs4)) { + uc[i] = ucs4; // high part never changes in simple casing + if (i + 1 < entire_shaper_item.item.length) { + ushort low = entire_shaper_item.string[si.position + i + 1]; + if (QChar::isLowSurrogate(low)) { + ucs4 = QChar::surrogateToUcs4(ucs4, low); + ucs4 = si.analysis.flags == QScriptAnalysis::Lowercase ? QChar::toLower(ucs4) + : QChar::toUpper(ucs4); + uc[++i] = QChar::lowSurrogate(ucs4); + } + } + } else { + uc[i] = si.analysis.flags == QScriptAnalysis::Lowercase ? QChar::toLower(ucs4) + : QChar::toUpper(ucs4); + } } entire_shaper_item.item.pos = 0; entire_shaper_item.string = uc; |