Allows for high dpi displays to get odd numbered pixel sizes, for
example, 13.5pt @ 2px/pt for 27px font. This implementation performs
all the sizing calculations with f32, rounding to the nearest pixel
size when it comes to rendering. In the future this can be enhanced
by adding fractional scaling to support fractional pixel sizes.
Key contains pointers into DerivedConfig. Each surface has its own
DerivedConfig. This would cause memory corruption if the surface that
opened the initial font grid deallocates. Instead, let's make sure Key
owns its own DerivedConfig.
Fixes#1670
This fixes two issues:
- If no font families are set, font points would not change the hash.
- DPI changes would not change the hash.
When the hash doesn't change when it should, we reuse a font stack due
to changes in #1662. This would cause some font issues. :)
