Chained calls to typeface provider?

[oconnor0]

Hi,

I'm in a situation where I want to control exactly what fonts are available for use by an SVG render.

I've implemented a TypefaceProvider to this effect.

Let's say that I want "font-family: foo;" to resolve to some specific typeface. In my example, I'm using Tinos. I can perform that lookup and return the typeface I want used. But then Svg.Skia calls FromFamilyName again but this time with the name specified in the typeface.

The path of execution is roughly:

1. A call to TypefaceProvider.FromFamilyName("foo", ...) returns Typeface("Tinos")
2. ...
3. A call to TypefaceProvider.FromFamilyName("Tinos", ...) needs to return Typeface("Tinos") or the font I want won't get used.

The second call to FromFamilyName based on the result of the first call to FromFamilyName was unexpected. It seemed unnecessary, but I wonder if I'm missing something?

https://github.com/oconnor0/bookish-broccoli demonstrates this all.

• dotnet run allows both "foo" and "Tinos" to resolve to that font.
• dotnet run -- --only-foo allows only "foo" to resolve to that font.
  Both produce a PNG in the run directory just so I haven't fooled myself that the font isn't being used or something.

There are also many more calls to TypefaceProvider.FromFamilyName than I expected, but maybe that's intentional?