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optimize QFontMetrics::inFontUcs4() and QFontMetricsF::inFontUcs4()

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upstream commit:
09bc8e2cb8

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2020-08-08 05:20:30 +03:00
parent cdace38489
commit bcd73f3852
1 changed files with 16 additions and 4 deletions
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20
src/gui/text/qfontmetrics.cpp
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@ -419,8 +419,14 @@ bool QFontMetrics::inFontUcs4(uint ucs4) const
Q_ASSERT(engine != 0);
if (engine->type() == QFontEngine::Box)
return false;
QString utf16 = QString::fromUcs4(&ucs4, 1);
return engine->canRender(utf16.data(), utf16.length());
if (QChar::requiresSurrogates(ucs4)) {
QChar utf16[2];
utf16[0] = QChar::highSurrogate(ucs4);
utf16[1] = QChar::lowSurrogate(ucs4);
return engine->canRender(utf16, 2);
}
QChar utf16(ucs4);
return engine->canRender(&utf16, 1);
}
/*!
@ -1285,8 +1291,14 @@ bool QFontMetricsF::inFontUcs4(uint ucs4) const
Q_ASSERT(engine != 0);
if (engine->type() == QFontEngine::Box)
return false;
QString utf16 = QString::fromUcs4(&ucs4, 1);
return engine->canRender(utf16.data(), utf16.length());
if (QChar::requiresSurrogates(ucs4)) {
QChar utf16[2];
utf16[0] = QChar::highSurrogate(ucs4);
utf16[1] = QChar::lowSurrogate(ucs4);
return engine->canRender(utf16, 2);
}
QChar utf16(ucs4);
return engine->canRender(&utf16, 1);
}
/*!