Store fonts as binary files (#28)

* Add fonts as binaries
* Rework generate_fonts_file to generate binary files
* Fix CI again
* Minimize binary size in examples

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Install libsdl2-dev
-        run: sudo apt-get install -y libsdl2-dev
+        run: sudo apt-get update && sudo apt-get install -y libsdl2-dev
 
       #- uses: Swatinem/rust-cache@v1
 
@@ -213,8 +213,11 @@ jobs:
 
       #- uses: Swatinem/rust-cache@v1
 
-      - name: Regenerate and check
-        run: ./regenerate_fonts_file.sh --check --hide-progress
+      - name: Regenerate fonts
+        run: ./regenerate_fonts_file.sh --hide-progress
+
+      - name: Check for diffs
+        run: git status && test -z "$(git status --porcelain)"
 
   msrv:
     name: Minimum Supported Rust Version

examples/simulator/Cargo.toml

@@ -14,3 +14,9 @@ u8g2-fonts = { path = "../..", features = [
 embedded-graphics = "0.8.0"
 embedded-graphics-simulator = "0.5.0"
 anyhow = "1.0.71"
+
+[profile.release]
+strip = true  # Automatically strip symbols from the binary.
+lto = true
+codegen-units = 1
+

regenerate_fonts_file.sh

@@ -5,4 +5,4 @@ set -eu
 SCRIPTPATH=$( cd "$(dirname "$(readlink -f "$0")")" || exit 1 ; pwd -P )
 cd "$SCRIPTPATH/tools/generate_fonts_file"
 
-cargo run --release -- "$@" "$SCRIPTPATH/u8g2/csrc/u8g2_fonts.c" "$SCRIPTPATH/src/fonts.rs"
+cargo run --release -- "$@" "$SCRIPTPATH/u8g2/csrc/u8g2_fonts.c" "$SCRIPTPATH/src/fonts"

src/font.rs

@@ -7,3 +7,16 @@ pub trait Font {
     #[doc(hidden)]
     const DATA: &'static [u8];
 }
+
+macro_rules! font_definitions {
+    ( $($fontname:ident),* $(,)? ) => {
+        $(
+            pub struct $fontname;
+            impl $crate::Font for $fontname {
+                const DATA: &'static [u8] = include_bytes!(concat!(stringify!($fontname), ".u8g2font"));
+            }
+        )*
+    };
+}
+
+pub(crate) use font_definitions;