internal FontFamily[] GetFontFamilies(Uri fontFamilyBaseUri, string fontFamilyLocationReference)
{
FontFamily[] fontFamilyList = new FontFamily[FamilyCount];
int i = 0;
foreach (MS.Internal.Text.TextInterface.FontFamily family in GetPhysicalFontFamilies())
{
string fontFamilyReference = Util.ConvertFamilyNameAndLocationToFontFamilyReference(
family.OrdinalName,
fontFamilyLocationReference
);
string friendlyName = Util.ConvertFontFamilyReferenceToFriendlyName(fontFamilyReference);
fontFamilyList[i++] = new FontFamily(fontFamilyBaseUri, friendlyName);
}
FontFamily fontFamily;
if (UseSystemFonts)
{
for (int j = 0; j < SystemCompositeFonts.NumOfSystemCompositeFonts; ++j)
{
fontFamily = CreateFontFamily(SystemCompositeFonts.GetCompositeFontFamilyAtIndex(j), fontFamilyBaseUri, fontFamilyLocationReference);
if (fontFamily != null)
{
fontFamilyList[i++] = fontFamily;
}
}
}
else
{
foreach (CompositeFontFamily compositeFontFamily in UserCompositeFonts)
{
fontFamily = CreateFontFamily(compositeFontFamily, fontFamilyBaseUri, fontFamilyLocationReference);
if (fontFamily != null)
{
fontFamilyList[i++] = fontFamily;
}
}
}
Debug.Assert(i == FamilyCount);
return(fontFamilyList);
}
internal IFontFamily LookupFamily(
string familyName,
ref FontStyle fontStyle,
ref FontWeight fontWeight,
ref FontStretch fontStretch
)
{
if (familyName == null || familyName.Length == 0)
{
return(null);
}
familyName = familyName.Trim();
// If we are referencing fonts from the system fonts, then it is cheap to lookup the 4 composite fonts
// that ship with WPF. Also, it happens often that familyName is "Global User Interface".
// So in this case we preceed looking into SystemComposite Fonts.
if (UseSystemFonts)
{
CompositeFontFamily compositeFamily = SystemCompositeFonts.FindFamily(familyName);
if (compositeFamily != null)
{
return(compositeFamily);
}
}
Text.TextInterface.FontFamily fontFamilyDWrite = _fontCollection[familyName];
// A font family was not found in DWrite's font collection.
if (fontFamilyDWrite == null)
{
// Having user defined composite fonts is not very common. So we defer looking into them to looking DWrite
// (which is opposite to what we do for system fonts).
if (!UseSystemFonts)
{
// The family name was not found in DWrite's font collection. It may possibly be the name of a composite font
// since DWrite does not recognize composite fonts.
CompositeFontFamily compositeFamily = LookUpUserCompositeFamily(familyName);
if (compositeFamily != null)
{
return(compositeFamily);
}
}
// The family name cannot be found. This may possibly be because the family name contains styling info.
// For example, "Arial Bold"
// We will strip off the styling info (one word at a time from the end) and try to find the family name.
int indexOfSpace = -1;
System.Text.StringBuilder potentialFaceName = new System.Text.StringBuilder();
// Start removing off strings from the end hoping they are
// style info so as to get down to the family name.
do
{
indexOfSpace = familyName.LastIndexOf(' ');
if (indexOfSpace < 0)
{
break;
}
else
{
// store the stripped off style names to look for the specific face later.
potentialFaceName.Insert(0, familyName.Substring(indexOfSpace));
familyName = familyName.Substring(0, indexOfSpace);
}
fontFamilyDWrite = _fontCollection[familyName];
} while (fontFamilyDWrite == null);
if (fontFamilyDWrite == null)
{
return(null);
}
// If there was styling information.
if (potentialFaceName.Length > 0)
{
// The first character in the potentialFaceName will be a space so we need to strip it off.
Text.TextInterface.Font font = GetFontFromFamily(fontFamilyDWrite, potentialFaceName.ToString(1, potentialFaceName.Length - 1));
if (font != null)
{
fontStyle = new FontStyle((int)font.Style);
fontWeight = new FontWeight((int)font.Weight);
fontStretch = new FontStretch((int)font.Stretch);
}
}
}
if (UseSystemFonts &&
LegacyArabicFonts.UsePrivateFontCollectionForLegacyArabicFonts
// familyName will hold the family name without any face info.
&& LegacyArabicFonts.IsLegacyArabicFont(familyName))
{
fontFamilyDWrite = LegacyArabicFonts.LegacyArabicFontCollection[familyName];
if (fontFamilyDWrite == null)
{
return(SystemCompositeFonts.GetFallbackFontForArabicLegacyFonts());
}
}
return(new PhysicalFontFamily(fontFamilyDWrite));
}
