SKTypefaceCollection fails to load fonts with weights that aren't % 50 == 0

[nielsbosma]

Describe the bug
SKTypefaceCollection fails to load fonts with weight that aren't weight % 50 == 0

To Reproduce
Steps to reproduce the behaviour:

Try to load a font with weight 270.

Issue at

Avalonia/src/Skia/Avalonia.Skia/SKTypefaceCollection.cs

Line 39 in 0ed90f0

for (var j = 0; j < initialWeight; j += 50)

My suggestion is to change the 50 to 10.

My workaround was to change the weight of the font to 250 with help from FontForge after struggling to get my font rendering to work.

Expected behaviour

It should work.

Screenshots

Desktop (please complete the following information):

• OS: [e.g. Windows, Mac, Linux (State distribution)]
  Windows
• Version
  -0.10.10

[Gillibald]

A FontWeight of 270 isn't a valid value

[Gillibald]

I think we could introduce an additional fallback here that just takes the first typeface that is in the collection.

[Sorien]

I think we could introduce an additional fallback here that just takes the first typeface that is in the collection.

browsers have some fancy fallback mechanism https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight#fallback_weights

[Gillibald]

You should also be able to set the FontWeight to 270 and it should work. In the end the fallback logic is failing to select your desired typeface. The fallback is needed because you didn't specify the FontWeight.

[nielsbosma]

The font that I purchased (Kommon Grotesk Light) has a weight of 270. Didn't want to specify both font family and weight for each place where I'm using it.