private static ICollection <FontFamily> CreateFamilyCollection(
Uri fontLocation,
Uri fontFamilyBaseUri,
string fontFamilyLocationReference
)
{
// Use reference comparison to determine the critical isWindowsFonts value. We want this
// to be true ONLY if we're called internally to enumerate the default family collection.
// See the SecurityNote for the FamilyCollection constructor.
FamilyCollection familyCollection =
object.ReferenceEquals(fontLocation, Util.WindowsFontsUriObject) ?
FamilyCollection.FromWindowsFonts(fontLocation) :
FamilyCollection.FromUri(fontLocation);
FontFamily[] fontFamilyList = familyCollection.GetFontFamilies(fontFamilyBaseUri, fontFamilyLocationReference);
return(Array.AsReadOnly <FontFamily>(fontFamilyList));
}
private static IFontFamily LookupFontFamily(NormalizedFontFamilyReference familyReference)
{
if (familyReference.IsUnresolved)
{
return(null);
}
FamilyCollection familyCollection;
if (familyReference.LocationUri != null)
{
familyCollection = FamilyCollection.FromUri(familyReference.LocationUri);
}
else
{
familyCollection = FamilyCollection.Default;
}
return(familyCollection.LookupFamily(familyReference.FamilyName));
}
internal static IFontFamily LookupFontFamilyAndFace(
CanonicalFontFamilyReference canonicalFamilyReference,
ref FontStyle style,
ref FontWeight weight,
ref FontStretch stretch
)
{
if (canonicalFamilyReference == null || object.ReferenceEquals(canonicalFamilyReference, CanonicalFontFamilyReference.Unresolved))
{
// no canonical name, e.g., because the friendly name was an empty string
// or could not be canonicalized
return(null);
}
try
{
FamilyCollection familyCollection;
if (canonicalFamilyReference.LocationUri == null && canonicalFamilyReference.EscapedFileName == null)
{
// No explicit location; use the default family collection.
familyCollection = _defaultFamilyCollection;
}
else if (canonicalFamilyReference.LocationUri != null)
{
// Look in the location specified by the font family reference.
familyCollection = FamilyCollection.FromUri(canonicalFamilyReference.LocationUri);
}
else // canonicalFamilyReference.EscapedFileName != null
{
// Look in the specified file in the Windows Fonts folder
// Note: CanonicalFamilyReference.EscapedFileName is safe to combine with Util.WindowsFontsUriObject because CanonicalFamilyReference guarantees that it will be a simple filename
// without relative path or directory components.
Uri locationUri = new Uri(Util.WindowsFontsUriObject, canonicalFamilyReference.EscapedFileName);
familyCollection = FamilyCollection.FromWindowsFonts(locationUri);
}
IFontFamily fontFamily = familyCollection.LookupFamily(
canonicalFamilyReference.FamilyName,
ref style,
ref weight,
ref stretch
);
return(fontFamily);
}
// The method returns null in case of malformed/non-existent fonts and we fall back to the next font.
// Therefore, we can disable PreSharp warning about empty catch bodies.
#pragma warning disable 6502
catch (FileFormatException)
{
// malformed font file
}
catch (IOException)
{
// canonical name points to a place that doesn't exist or can't be read for some reason
}
catch (UnauthorizedAccessException)
{
// canonical name points to a place caller doesn't have permission to access
}
catch (ArgumentException)
{
// canonical name points to a valid Uri that doesn't point to a well formed
// OS local path
}
catch (NotSupportedException)
{
// canonical name points to a Uri that specifies an unregistered scheme
}
catch (UriFormatException)
{
// canonical name points to a malformed Uri
}
#pragma warning restore 6502
// we want to fall back to the default fallback font instead of crashing
return(null);
}