private static FontDetails GetFont(
string?name,
FontWeight weight,
FontStretch stretch,
FontStyle style)
{
var skWeight = weight.ToSkiaWeight();
// TODO: FontStretch not supported by Uno yet
// var skWidth = FontStretch.ToSkiaWidth();
var skWidth = SKFontStyleWidth.Normal;
var skSlant = style.ToSkiaSlant();
SKTypeface skTypeFace;
if (name == null || string.Equals(name, "XamlAutoFontFamily", StringComparison.OrdinalIgnoreCase))
{
skTypeFace = SKTypeface.FromFamilyName(null, skWeight, skWidth, skSlant);
}
else if (name.StartsWith(XamlFilePathHelper.AppXIdentifier))
{
var path = new Uri(name).PathAndQuery;
var filePath = global::System.IO.Path.Combine(Windows.ApplicationModel.Package.Current.InstalledLocation.Path, path.TrimStart('/')
.Replace('/', global::System.IO.Path.DirectorySeparatorChar));
skTypeFace = SKTypeface.FromFile(filePath);
}
else
{
skTypeFace = SKTypeface.FromFamilyName(name, skWeight, skWidth, skSlant);
// FromFontFamilyName may return null: https://github.com/mono/SkiaSharp/issues/1058
if (skTypeFace == null)
{
if (typeof(Inline).Log().IsEnabled(LogLevel.Warning))
{
typeof(Inline).Log().LogWarning($"The font {name} could not be found, using system default");
}
skTypeFace = SKTypeface.FromFamilyName(null, skWeight, skWidth, skSlant);
}
}
Blob?GetTable(Face face, Tag tag)
{
var size = skTypeFace.GetTableSize(tag);
if (size == 0)
{
return(null);
}
var data = Marshal.AllocCoTaskMem(size);
var releaseDelegate = new ReleaseDelegate(() => Marshal.FreeCoTaskMem(data));
var value = skTypeFace.TryGetTableData(tag, 0, size, data) ?
new Blob(data, size, MemoryMode.Writeable, releaseDelegate) : null;
return(value);
}
var hbFace = new Face(GetTable);
hbFace.UnitsPerEm = skTypeFace.UnitsPerEm;
var hbFont = new Font(hbFace);
hbFont.SetScale(FontScale, FontScale);
hbFont.SetFunctionsOpenType();
return(new(skTypeFace, hbFont, hbFace));
}