int QFontMetrics::width( QChar ch ) const
{
unsigned short uc = ch.unicode();
if ( uc < QFontEngineData::widthCacheSize &&
d->engineData && d->engineData->widthCache[ uc ] )
return d->engineData->widthCache[ uc ];
if ( ::category( ch ) == QChar::Mark_NonSpacing || qIsZeroWidthChar(ch.unicode()))
return 0;
QFont::Script script;
SCRIPT_FOR_CHAR( script, ch );
QFontEngine *engine = d->engineForScript( script );
#ifdef QT_CHECK_STATE
Q_ASSERT( engine != 0 );
#endif // QT_CHECK_STATE
glyph_t glyphs[8];
advance_t advances[8];
int nglyphs = 7;
engine->stringToCMap( &ch, 1, glyphs, advances, &nglyphs, FALSE );
// ### can nglyphs != 1 happen at all? Not currently I think
if ( uc < QFontEngineData::widthCacheSize && advances[0] > 0 && advances[0] < 0x100 )
d->engineData->widthCache[ uc ] = advances[0];
return advances[0];
}
int QFontMetrics::charWidth( const QString &str, int pos ) const
{
if ( pos < 0 || pos > (int)str.length() )
return 0;
const QChar &ch = str.unicode()[ pos ];
if ( ch.unicode() < QFontEngineData::widthCacheSize &&
d->engineData && d->engineData->widthCache[ ch.unicode() ] )
return (d->engineData->widthCache[ ch.unicode() ]*d->engineData->engine->scale)>>8;
QFont::Script script;
SCRIPT_FOR_CHAR( script, ch );
int width;
if ( script >= QFont::Arabic && script <= QFont::Khmer ) {
// complex script shaping. Have to do some hard work
int from = QMAX( 0, pos - 8 );
int to = QMIN( (int)str.length(), pos + 8 );
QConstString cstr( str.unicode()+from, to-from);
QTextEngine layout( cstr.string(), d );
layout.itemize( QTextEngine::WidthOnly );
width = layout.width( pos-from, 1 );
} else if ( ::category( ch ) == QChar::Mark_NonSpacing || qIsZeroWidthChar(ch.unicode())) {
width = 0;
} else {
QFontEngine *engine = d->engineForScript( script );
#ifdef QT_CHECK_STATE
Q_ASSERT( engine != 0 );
#endif // QT_CHECK_STATE
glyph_t glyphs[8];
advance_t advances[8];
int nglyphs = 7;
engine->stringToCMap( &ch, 1, glyphs, advances, &nglyphs, FALSE );
width = advances[0];
}
if ( ch.unicode() < QFontEngineData::widthCacheSize && width > 0 && width < 0x100 )
d->engineData->widthCache[ ch.unicode() ] = width;
return width;
}
/*!
Internal function that initializes the font system.
\internal
The font cache and font dict do not alloc the keys. The key is a QString
which is shared between QFontPrivate and QXFontName.
*/
void QFont::initialize()
{
// create global font cache
if ( ! QFontCache::instance ) (void) new QFontCache;
#ifndef QT_NO_CODECS
#ifndef QT_NO_BIG_CODECS
static bool codecs_once = FALSE;
if ( ! codecs_once ) {
(void) new QFontJis0201Codec;
(void) new QFontJis0208Codec;
(void) new QFontKsc5601Codec;
(void) new QFontGb2312Codec;
(void) new QFontGbkCodec;
(void) new QFontGb18030_0Codec;
(void) new QFontBig5Codec;
(void) new QFontBig5hkscsCodec;
(void) new QFontLaoCodec;
codecs_once = TRUE;
}
#endif // QT_NO_BIG_CODECS
#endif // QT_NO_CODECS
extern int qt_encoding_id_for_mib( int mib ); // from qfontdatabase_x11.cpp
QTextCodec *codec = QTextCodec::codecForLocale();
// determine the default encoding id using the locale, otherwise
// fallback to latin1 ( mib == 4 )
int mib = codec ? codec->mibEnum() : 4;
// for asian locales, use the mib for the font codec instead of the locale codec
switch (mib) {
case 38: // eucKR
mib = 36;
break;
case 2025: // GB2312
mib = 57;
break;
case 113: // GBK
mib = -113;
break;
case 114: // GB18030
mib = -114;
break;
case 2026: // Big5
mib = -2026;
break;
case 2101: // Big5-HKSCS
mib = -2101;
break;
case 16: // JIS7
mib = 15;
break;
case 17: // SJIS
case 18: // eucJP
mib = 63;
break;
}
// get the default encoding id for the locale encoding...
QFontPrivate::defaultEncodingID = qt_encoding_id_for_mib( mib );
// get some sample text based on the users locale. we use this to determine the
// default script for the font system
QCString oldlctime = setlocale(LC_TIME, 0);
QCString lctime = setlocale(LC_TIME, "");
time_t ttmp = time(0);
struct tm *tt = 0;
char samp[64];
QString sample;
if ( ttmp != -1 ) {
#if defined(QT_THREAD_SUPPORT) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
// use the reentrant versions of localtime() where available
tm res;
tt = localtime_r( &ttmp, &res );
#else
tt = localtime( &ttmp );
#endif // QT_THREAD_SUPPORT && _POSIX_THREAD_SAFE_FUNCTIONS
if ( tt != 0 && strftime( samp, 64, "%A%B", tt ) > 0 )
if ( codec )
sample = codec->toUnicode( samp );
}
if ( ! sample.isNull() && ! sample.isEmpty() ) {
QFont::Script cs = QFont::NoScript, tmp;
const QChar *uc = sample.unicode();
QFontPrivate *priv = new QFontPrivate;
for ( uint i = 0; i < sample.length(); i++ ) {
SCRIPT_FOR_CHAR( tmp, *uc );
uc++;
if ( tmp != cs && tmp != QFont::UnknownScript ) {
cs = tmp;
break;
}
}
delete priv;
if ( cs != QFont::UnknownScript )
QFontPrivate::defaultScript = cs;
}
setlocale( LC_TIME, oldlctime.data() );
}
