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Allow access to font atlases (#18851)

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# Objective
It's not possible atm for third-party crates to create their own text
systems that use the existing cosmic-text `FontSystem` and font atlases.

## Solution
Make `FontFaceInfo`, `TextPipeline::map_handle_to_font_id`, and
`load_font_fontdb` public so third-party crates can access and update
the existing font atlases
This commit is contained in:
ickshonpe 2025-05-26 16:22:56 +01:00 committed by GitHub
parent 3edacb5e46
commit c8872c7665
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1 changed files with 12 additions and 7 deletions
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19
crates/bevy_text/src/pipeline.rs
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@ -53,11 +53,15 @@ impl Default for SwashCache {
/// Information about a font collected as part of preparing for text layout.
#[derive(Clone)]
struct FontFaceInfo {
stretch: cosmic_text::fontdb::Stretch,
style: cosmic_text::fontdb::Style,
weight: cosmic_text::fontdb::Weight,
family_name: Arc<str>,
pub struct FontFaceInfo {
/// Width class: <https://docs.microsoft.com/en-us/typography/opentype/spec/os2#uswidthclass>
pub stretch: cosmic_text::fontdb::Stretch,
/// Allows italic or oblique faces to be selected
pub style: cosmic_text::fontdb::Style,
/// The degree of blackness or stroke thickness
pub weight: cosmic_text::fontdb::Weight,
/// Font family name
pub family_name: Arc<str>,
}
/// The `TextPipeline` is used to layout and render text blocks (see `Text`/[`Text2d`](crate::Text2d)).
@ -66,7 +70,7 @@ struct FontFaceInfo {
#[derive(Default, Resource)]
pub struct TextPipeline {
/// Identifies a font [`ID`](cosmic_text::fontdb::ID) by its [`Font`] [`Asset`](bevy_asset::Asset).
map_handle_to_font_id: HashMap<AssetId<Font>, (cosmic_text::fontdb::ID, Arc<str>)>,
pub map_handle_to_font_id: HashMap<AssetId<Font>, (cosmic_text::fontdb::ID, Arc<str>)>,
/// Buffered vec for collecting spans.
///
/// See [this dark magic](https://users.rust-lang.org/t/how-to-cache-a-vectors-capacity/94478/10).
@ -484,7 +488,8 @@ impl TextMeasureInfo {
}
}
fn load_font_to_fontdb(
/// Add the font to the cosmic text's `FontSystem`'s in-memory font database
pub fn load_font_to_fontdb(
text_font: &TextFont,
font_system: &mut cosmic_text::FontSystem,
map_handle_to_font_id: &mut HashMap<AssetId<Font>, (cosmic_text::fontdb::ID, Arc<str>)>,