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Variable font support (#400)

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* Variable font support

Here's a pretty naïve solution for variable fonts.

The iterator doesn't use the match keys' weight, but instead tries to
get the requested ideal weight, if the font is variable, otherwise it is
ignored and the actual (non-variable) weight is used. This is because I
didn't implement finding variable weight support for match keys; doing
so would be impossible without parsing TTF files when matching and I
didn't want to add that potentially expensive infrastructure if not
entirely necessary.

This is a breaking change, and I'm open for ideas on how to fix that
if it's an issue.

* cargo fmt

* Add variable font example to rich-text example
This commit is contained in:
Wren [Undefined] 2025-07-07 09:50:40 -05:00 • committed by GitHub
parent d15011fba5
commit a03faa654d
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10 changed files with 119 additions and 34 deletions
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22
examples/rich-text/src/main.rs
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@ -24,6 +24,7 @@ fn set_buffer_text(buffer: &mut BorrowedWithFontSystem<'_, Buffer>) {
let serif_attrs = attrs.clone().family(Family::Serif);
let mono_attrs = attrs.clone().family(Family::Monospace);
let comic_attrs = attrs.clone().family(Family::Name("Comic Neue"));
let inter_attrs = attrs.clone().family(Family::Name("Inter Variable"));
let spans: &[(&str, Attrs)] = &[
(
@ -128,6 +129,21 @@ fn set_buffer_text(buffer: &mut BorrowedWithFontSystem<'_, Buffer>) {
.clone()
.cache_key_flags(CacheKeyFlags::DISABLE_HINTING),
),
(
"Inter Variable: 400 ",
inter_attrs.clone().weight(Weight(400)),
),
("200 ", inter_attrs.clone().weight(Weight(200))),
("250 ", inter_attrs.clone().weight(Weight(250))),
("300\n", inter_attrs.clone().weight(Weight(300))),
(
"Inter Variable Italic: 400 ",
inter_attrs.clone().weight(Weight(400)).style(Style::Italic),
),
(
"800",
inter_attrs.clone().weight(Weight(800)).style(Style::Italic),
),
];
buffer.set_rich_text(
@ -146,6 +162,12 @@ fn main() {
let context = softbuffer::Context::new(window.clone()).unwrap();
let mut surface = softbuffer::Surface::new(&context, window.clone()).unwrap();
let mut font_system = FontSystem::new();
let inter_variable = include_bytes!("../../../fonts/InterVariable.ttf");
font_system.db_mut().load_font_data(inter_variable.to_vec());
let inter_variable_italic = include_bytes!("../../../fonts/InterVariable-Italic.ttf");
font_system
.db_mut()
.load_font_data(inter_variable_italic.to_vec());
let mut swash_cache = SwashCache::new();
let mut display_scale = window.scale_factor() as f32;