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QWindowsFontDatabase: provide better fallbackFamilies.

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Borrowed some code from QWindowsFontDatabase::createEngine that will
help ensure our fallback options are thorough enough to display say
chinese glyphs when using the QRawFont + QTextLayout combination that
QtWebKit relies on.

Task-number: QTWEBKIT-383
Change-Id: Ie4c1d5ef7d58588afaa436c89a9575ffd646c314
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
This commit is contained in:
Pierre Rossi 2012-12-04 18:05:09 +01:00 committed by The Qt Project
parent 418890e074
commit 3b5537765e
1 changed files with 87 additions and 74 deletions
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161
src/plugins/platforms/windows/qwindowsfontdatabase.cpp
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@ -1300,43 +1300,6 @@ QFontEngine *QWindowsFontDatabase::fontEngine(const QByteArray &fontData, qreal
return fontEngine;
}
QStringList QWindowsFontDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script) const
{
QStringList result = QPlatformFontDatabase::fallbacksForFamily(family, style, styleHint, script);
if (!result.isEmpty())
return result;
switch (styleHint) {
case QFont::Times:
result << QString::fromLatin1("Times New Roman");
break;
case QFont::Courier:
result << QString::fromLatin1("Courier New");
break;
case QFont::Monospace:
result << QString::fromLatin1("Courier New");
break;
case QFont::Cursive:
result << QString::fromLatin1("Comic Sans MS");
break;
case QFont::Fantasy:
result << QString::fromLatin1("Impact");
break;
case QFont::Decorative:
result << QString::fromLatin1("Old English");
break;
case QFont::Helvetica:
case QFont::System:
default:
result << QString::fromLatin1("Arial");
}
if (QWindowsContext::verboseFonts)
qDebug() << __FUNCTION__ << family << style << styleHint
<< script << result << m_families.size();
return result;
}
static QList<quint32> getTrueTypeFontOffsets(const uchar *fontData)
{
QList<quint32> offsets;
@ -1688,6 +1651,82 @@ LOGFONT QWindowsFontDatabase::fontDefToLOGFONT(const QFontDef &request)
return lf;
}
static QStringList extraTryFontsForFamily(const QString& family)
{
QStringList result;
QFontDatabase db;
if (!db.writingSystems(family).contains(QFontDatabase::Symbol)) {
if (!tryFonts) {
LANGID lid = GetUserDefaultLangID();
switch (lid&0xff) {
case LANG_CHINESE: // Chinese (Taiwan)
if ( lid == 0x0804 ) // Taiwan
tryFonts = ch_TW_tryFonts;
else
tryFonts = ch_CN_tryFonts;
break;
case LANG_JAPANESE:
tryFonts = jp_tryFonts;
break;
case LANG_KOREAN:
tryFonts = kr_tryFonts;
break;
default:
tryFonts = other_tryFonts;
break;
}
}
QStringList fm = QFontDatabase().families();
const char **tf = tryFonts;
while (tf && *tf) {
if (fm.contains(QLatin1String(*tf)))
result << QLatin1String(*tf);
++tf;
}
}
return result;
}
QStringList QWindowsFontDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script) const
{
QStringList result = QPlatformFontDatabase::fallbacksForFamily(family, style, styleHint, script);
if (!result.isEmpty())
return result;
switch (styleHint) {
case QFont::Times:
result << QString::fromLatin1("Times New Roman");
break;
case QFont::Courier:
result << QString::fromLatin1("Courier New");
break;
case QFont::Monospace:
result << QString::fromLatin1("Courier New");
break;
case QFont::Cursive:
result << QString::fromLatin1("Comic Sans MS");
break;
case QFont::Fantasy:
result << QString::fromLatin1("Impact");
break;
case QFont::Decorative:
result << QString::fromLatin1("Old English");
break;
case QFont::Helvetica:
case QFont::System:
default:
result << QString::fromLatin1("Arial");
}
result.append(extraTryFontsForFamily(family));
if (QWindowsContext::verboseFonts)
qDebug() << __FUNCTION__ << family << style << styleHint
<< script << result << m_families.size();
return result;
}
QFontEngine *QWindowsFontDatabase::createEngine(int script, const QFontDef &request,
HDC fontHdc, int dpi, bool rawMode,
const QStringList &family_list,
@ -1850,43 +1889,17 @@ QFontEngine *QWindowsFontDatabase::createEngine(int script, const QFontDef &requ
directWriteFont->Release();
#endif
if(script == QUnicodeTables::Common
&& !(request.styleStrategy & QFont::NoFontMerging)) {
QFontDatabase db;
if (!db.writingSystems(request.family).contains(QFontDatabase::Symbol)) {
if(!tryFonts) {
LANGID lid = GetUserDefaultLangID();
switch( lid&0xff ) {
case LANG_CHINESE: // Chinese (Taiwan)
if ( lid == 0x0804 ) // Taiwan
tryFonts = ch_TW_tryFonts;
else
tryFonts = ch_CN_tryFonts;
break;
case LANG_JAPANESE:
tryFonts = jp_tryFonts;
break;
case LANG_KOREAN:
tryFonts = kr_tryFonts;
break;
default:
tryFonts = other_tryFonts;
break;
}
}
QStringList fm = QFontDatabase().families();
QStringList list = family_list;
const char **tf = tryFonts;
while(tf && *tf) {
if(fm.contains(QLatin1String(*tf)))
list << QLatin1String(*tf);
++tf;
}
QFontEngine *mfe = new QWindowsMultiFontEngine(fe, list);
mfe->setObjectName(QStringLiteral("QWindowsMultiFontEngine_") + request.family);
mfe->fontDef = fe->fontDef;
fe = mfe;
}
if (script == QUnicodeTables::Common
&& !(request.styleStrategy & QFont::NoFontMerging)) {
QStringList extraFonts = extraTryFontsForFamily(request.family);
if (extraFonts.size()) {
QStringList list = family_list;
list.append(extraFonts);
QFontEngine *mfe = new QWindowsMultiFontEngine(fe, list);
mfe->setObjectName(QStringLiteral("QWindowsMultiFontEngine_") + request.family);
mfe->fontDef = fe->fontDef;
fe = mfe;
}
}
return fe;
}