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[QCoreTextFontDatabase] Micro optimization 

With use of pre-allocated buffer, there is always a good chance
to get the requested data with a single call.

Change-Id: I8fed718e15970ab345ce96a9405578947b59f311
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
bb10
Konstantin Ritt 2015-02-17 11:36:36 +04:00
parent 8f1eb52525
commit 9a3754c570
1 changed files with 19 additions and 13 deletions
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32
src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
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@ -270,23 +270,29 @@ static void getFontDescription(CTFontDescriptorRef font, FontDescription *fd)
fd->fixedPitch = false;
if (QCFType<CTFontRef> tempFont = CTFontCreateWithFontDescriptor(font, 0.0, 0)) {
uint length = 0;
uint tag = MAKE_TAG('O', 'S', '/', '2');
CTFontRef tempFontRef = tempFont;
void *userData = reinterpret_cast<void *>(&tempFontRef);
if (QCoreTextFontEngine::ct_getSfntTable(userData, tag, 0, &length)) {
QVarLengthArray<uchar> os2Table(length);
if (length >= 86 && QCoreTextFontEngine::ct_getSfntTable(userData, tag, os2Table.data(), &length)) {
quint32 unicodeRange[4] = {
qFromBigEndian<quint32>(os2Table.data() + 42),
qFromBigEndian<quint32>(os2Table.data() + 46),
qFromBigEndian<quint32>(os2Table.data() + 50),
qFromBigEndian<quint32>(os2Table.data() + 54)
};
quint32 codePageRange[2] = { qFromBigEndian<quint32>(os2Table.data() + 78),
qFromBigEndian<quint32>(os2Table.data() + 82) };
fd->writingSystems = QPlatformFontDatabase::writingSystemsFromTrueTypeBits(unicodeRange, codePageRange);
uint length = 128;
QVarLengthArray<uchar, 128> os2Table(length);
if (QCoreTextFontEngine::ct_getSfntTable(userData, tag, os2Table.data(), &length) && length >= 86) {
if (length > os2Table.length()) {
os2Table.resize(length);
if (!QCoreTextFontEngine::ct_getSfntTable(userData, tag, os2Table.data(), &length))
Q_UNREACHABLE();
Q_ASSERT(length >= 86);
}
quint32 unicodeRange[4] = {
qFromBigEndian<quint32>(os2Table.data() + 42),
qFromBigEndian<quint32>(os2Table.data() + 46),
qFromBigEndian<quint32>(os2Table.data() + 50),
qFromBigEndian<quint32>(os2Table.data() + 54)
};
quint32 codePageRange[2] = {
qFromBigEndian<quint32>(os2Table.data() + 78),
qFromBigEndian<quint32>(os2Table.data() + 82)
};
fd->writingSystems = QPlatformFontDatabase::writingSystemsFromTrueTypeBits(unicodeRange, codePageRange);
}
}