TextPlugin + FontLoader

crates/bevy_text/Cargo.toml

@@ -7,7 +7,10 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+bevy_app = { path = "../bevy_app" }
+bevy_asset = { path = "../bevy_asset" }
 bevy_render = { path = "../bevy_render" }
 skribo = "0.1.0"
 font-kit = "0.6"
-pathfinder_geometry = "0.5"
+pathfinder_geometry = "0.5"
+anyhow = "1.0"

crates/bevy_text/src/font.rs

@@ -9,6 +9,9 @@ pub struct Font {
     pub metrics: Metrics,
 }
 
+unsafe impl Send for Font {}
+unsafe impl Sync for Font {}
+
 impl Font {
     pub fn try_from_bytes(font_data: Vec<u8>) -> Result<Self, FontLoadingError> {
         let font = font_kit::font::Font::from_bytes(Arc::new(font_data), 0)?;

crates/bevy_text/src/font_loader.rs

@@ -0,0 +1,16 @@
+use crate::Font;
+use bevy_asset::{AssetLoader, AssetPath};
+use anyhow::Result;
+
+#[derive(Clone)]
+pub struct FontLoader;
+
+impl AssetLoader<Font> for FontLoader {
+    fn from_bytes(&self, _asset_path: &AssetPath, bytes: Vec<u8>) -> Result<Font> {
+        Ok(Font::try_from_bytes(bytes)?)
+    }
+    fn extensions(&self) -> &[&str] {
+        static EXTENSIONS: &[&str] = &["ttf"];
+        EXTENSIONS
+    }
+}

crates/bevy_text/src/lib.rs

@@ -1,4 +1,20 @@
 mod font;
+mod font_loader;
 mod render;
 
 pub use font::*;
+pub use font_loader::*;
+
+use bevy_app::{AppBuilder, AppPlugin};
+use bevy_asset::AddAsset;
+
+#[derive(Default)]
+pub struct TextPlugin;
+
+impl AppPlugin for TextPlugin {
+    fn build(&self, app: &mut AppBuilder) {
+        app
+            .add_asset::<Font>()
+            .add_asset_loader(FontLoader);
+    }
+}

examples/ui/text.rs

@@ -1,5 +1,4 @@
 use bevy::prelude::*;
-use std::{fs::File, io::Read};
 
 fn main() {
     App::build()
@@ -10,13 +9,13 @@ fn main() {
 
 fn setup(
     command_buffer: &mut CommandBuffer,
+    asset_server: Res<AssetServer>,
+    mut fonts: ResMut<Assets<Font>>,
     mut textures: ResMut<Assets<Texture>>,
     mut materials: ResMut<Assets<ColorMaterial>>,
 ) {
-    let mut font_file = File::open("assets/fonts/FiraSans-Bold.ttf").unwrap();
-    let mut buffer = Vec::new();
-    font_file.read_to_end(&mut buffer).unwrap();
-    let font = Font::try_from_bytes(buffer).unwrap();
+    let font_handle = asset_server.load_sync(&mut fonts, "assets/fonts/FiraSans-Bold.ttf").unwrap();
+    let font = fonts.get(&font_handle).unwrap();
 
     let texture = font.render_text("Hello from Bevy!", Color::rgba(0.9, 0.9, 0.9, 1.0), 500, 60);
     let half_width = texture.width as f32 / 2.0;

src/add_default_plugins.rs

@@ -33,6 +33,9 @@ impl AddDefaultPlugins for AppBuilder {
         #[cfg(feature = "gltf")]
         self.add_plugin(bevy_gltf::GltfPlugin::default());
 
+        #[cfg(feature = "text")]
+        self.add_plugin(bevy_text::TextPlugin::default());
+
         #[cfg(feature = "winit")]
         self.add_plugin(bevy_winit::WinitPlugin::default());
         #[cfg(not(feature = "winit"))]