optionally load decoration font at runtime instead of embedding it

Cargo.lock

@@ -233,6 +233,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dlib"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "330c60081dcc4c72131f8eb70510f1ac07223e5d4163db481a04a0befcffa412"
+dependencies = [
+ "libloading",
+]
+
 [[package]]
 name = "downcast-rs"
 version = "1.2.1"
@@ -311,6 +320,15 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
+[[package]]
+name = "fontconfig"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b19c4bca8c705ea23bfb3e3403a9e699344d1ee3205b631f03fe4dbf1e52429f"
+dependencies = [
+ "yeslogic-fontconfig-sys",
+]
+
 [[package]]
 name = "fontdue"
 version = "0.9.3"
@@ -1228,6 +1246,7 @@ dependencies = [
  "ab_glyph",
  "anyhow",
  "bitflags 2.10.0",
+ "fontconfig",
  "fontdue",
  "hecs",
  "log",
@@ -1248,6 +1267,17 @@ dependencies = [
  "xcb-util-cursor",
 ]
 
+[[package]]
+name = "yeslogic-fontconfig-sys"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "503a066b4c037c440169d995b869046827dbc71263f6e8f3be6d77d4f3229dbd"
+dependencies = [
+ "dlib",
+ "once_cell",
+ "pkg-config",
+]
+
 [[package]]
 name = "zerocopy"
 version = "0.8.31"

Cargo.toml

@@ -44,6 +44,7 @@ pretty_env_logger = "0.5.0"
 xcb-util-cursor = "0.3.5"
 smithay-client-toolkit = { version = "0.20.0", default-features = false }
 
+fontconfig = { version = "0.10", optional = true }
 sd-notify = { version = "0.4.2", optional = true }
 macros = { version = "0.1.0", path = "macros" }
 hecs = { version = "0.10.5", features = ["macros"] }
@@ -55,6 +56,8 @@ fontdue = "0.9.3"
 [features]
 default = []
 systemd = ["dep:sd-notify"]
+# load decoration font at runtime instead of embedding it into the executable
+fontconfig = ["dep:fontconfig"]
 
 [dev-dependencies]
 rustix = { workspace = true, features = ["fs"] }

src/server/decoration.rs

@@ -6,6 +6,7 @@ use hecs::{CommandBuffer, Entity, World};
 use log::{error, warn};
 use smithay_client_toolkit::registry::SimpleGlobal;
 use smithay_client_toolkit::shm::slot::SlotPool;
+use std::borrow::Cow;
 use std::sync::LazyLock;
 use tiny_skia::{Color, Paint, PathBuilder, Pixmap, Stroke, Transform};
 use tiny_skia::{ColorU8, Rect};
@@ -404,6 +405,25 @@ fn title_pixmap(title: &str, max_width: u32, height: u32, scale: f32) -> Option<
     Some(pixmap)
 }
 
+static FONT_DATA: LazyLock<Cow<'static, [u8]>> = LazyLock::new(|| {
+    #[cfg(feature = "fontconfig")]
+    {
+        let fc = fontconfig::Fontconfig::new().expect("Failed to initialize fontconfig.");
+        let font = fc
+            .find("opensans", None)
+            .expect("Failed to load Open Sans Regular.");
+        let data = std::fs::read(font.path).expect("Failed to read font from disk.");
+        Cow::Owned(data)
+    }
+    #[cfg(not(feature = "fontconfig"))]
+    {
+        Cow::Borrowed(include_bytes!("../../OpenSans-Regular.ttf"))
+    }
+});
+
+static FONT: LazyLock<FontRef<'_>> =
+    LazyLock::new(|| FontRef::try_from_slice(FONT_DATA.as_ref()).unwrap());
+
 fn layout_title_glyphs(
     text: &str,
     max_width: u32,
@@ -412,9 +432,6 @@ fn layout_title_glyphs(
 ) -> (Vec<Glyph>, PxScaleFont<&FontRef<'_>>) {
     const TEXT_SIZE: f32 = 10.0;
     const TEXT_MARGIN: f32 = 11.0;
-    static FONT: LazyLock<FontRef<'_>> = LazyLock::new(|| {
-        FontRef::try_from_slice(include_bytes!("../../OpenSans-Regular.ttf")).unwrap()
-    });
 
     let mut ret = Vec::<Glyph>::new();