Move default fonts to new crate `epaint_default_fonts` (#4853)

This allows license checking tools to omit the OFL and UFL licenses when
`default_fonts` are turned off.

There was some discussion of versioning on the original issue; I have
chosen to label this version as `0.28.1` to match the other crates.
Happy to adjust the version as needed.

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* Closes <https://github.com/emilk/egui/issues/2321>
* [X] I have followed the instructions in the PR template

---------

Co-authored-by: Alex Pinkus <pinkus@amazon.com>

.github/workflows/labels.yml

@@ -29,4 +29,4 @@ jobs:
         with:
           mode: minimum
           count: 1
-          labels: "CI, dependencies, docs and examples, ecolor, eframe, egui_extras, egui_glow, egui-wgpu, egui-winit, egui, epaint, exclude from changelog, typo"
+          labels: "CI, dependencies, docs and examples, ecolor, eframe, egui_extras, egui_glow, egui-wgpu, egui-winit, egui, epaint, epaint_default_fonts, exclude from changelog, typo"

ARCHITECTURE.md

@@ -5,7 +5,7 @@ Also see [`CONTRIBUTING.md`](CONTRIBUTING.md) for what to do before opening a PR
 
 
 ## Crate overview
-The crates in this repository are: `egui, emath, epaint, egui_extras, egui-winit, egui_glow, egui_demo_lib, egui_demo_app`.
+The crates in this repository are: `egui, emath, epaint, epaint_default_fonts, egui_extras, egui-winit, egui_glow, egui_demo_lib, egui_demo_app`.
 
 ### `egui`: The main GUI library.
 Example code: `if ui.button("Click me").clicked() { … }`
@@ -19,7 +19,12 @@ Examples: `Vec2, Pos2, Rect, lerp, remap`
 
 Example: `Shape::Circle { center, radius, fill, stroke }`
 
-Depends on `emath`.
+Depends on `emath`. Also depends on `epaint_default_fonts` when the `default_fonts` feature is enabled.
+
+### `epaint_default_fonts`
+Embedded fonts (using `include_bytes!()`) for use by `epaint` in selecting defaults.
+
+Since the font files themselves are licensed differently from the `epaint` source code, this simplifies licenses for callers who disable the default fonts.
 
 ### `egui_extras`
 This adds additional features on top of `egui`.

Cargo.lock

@@ -1444,6 +1444,7 @@ dependencies = [
  "document-features",
  "ecolor",
  "emath",
+ "epaint_default_fonts",
  "log",
  "nohash-hasher",
  "parking_lot",
@@ -1452,6 +1453,10 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "epaint_default_fonts"
+version = "0.28.1"
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"

Cargo.toml

@@ -11,6 +11,7 @@ members = [
     "crates/egui",
     "crates/emath",
     "crates/epaint",
+    "crates/epaint_default_fonts",
 
     "examples/*",
     "tests/*",
@@ -56,6 +57,7 @@ opt-level = 2
 emath = { version = "0.28.1", path = "crates/emath", default-features = false }
 ecolor = { version = "0.28.1", path = "crates/ecolor", default-features = false }
 epaint = { version = "0.28.1", path = "crates/epaint", default-features = false }
+epaint_default_fonts = { version = "0.28.1", path = "crates/epaint_default_fonts" }
 egui = { version = "0.28.1", path = "crates/egui", default-features = false }
 egui-winit = { version = "0.28.1", path = "crates/egui-winit", default-features = false }
 egui_extras = { version = "0.28.1", path = "crates/egui_extras", default-features = false }

RELEASES.md

@@ -76,6 +76,7 @@ I usually do this all on the `master` branch, but doing it in a release branch i
 (cd crates/emath                && cargo publish --quiet)  &&  echo "✅ emath"
 (cd crates/ecolor               && cargo publish --quiet)  &&  echo "✅ ecolor"
 (cd crates/epaint               && cargo publish --quiet)  &&  echo "✅ epaint"
+(cd crates/epaint_default_fonts && cargo publish --quiet)  &&  echo "✅ epaint_default_fonts"
 (cd crates/egui                 && cargo publish --quiet)  &&  echo "✅ egui"
 (cd crates/egui-winit           && cargo publish --quiet)  &&  echo "✅ egui-winit"
 (cd crates/egui_extras          && cargo publish --quiet)  &&  echo "✅ egui_extras"

crates/epaint/Cargo.toml

@@ -6,7 +6,7 @@ description = "Minimal 2D graphics library for GUI work"
 edition.workspace = true
 rust-version.workspace = true
 homepage = "https://github.com/emilk/egui/tree/master/crates/epaint"
-license = "(MIT OR Apache-2.0) AND OFL-1.1 AND LicenseRef-UFL-1.0" # OFL and UFL used by default_fonts. See https://github.com/emilk/egui/issues/2321
+license = "MIT OR Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/emilk/egui/tree/master/crates/epaint"
 categories = ["graphics", "gui"]
@@ -15,11 +15,7 @@ include = [
   "../LICENSE-APACHE",
   "../LICENSE-MIT",
   "**/*.rs",
-  "Cargo.toml",
-  "fonts/*.ttf",
-  "fonts/*.txt",
-  "fonts/OFL.txt",
-  "fonts/UFL.txt",
+  "Cargo.toml"
 ]
 
 [lints]
@@ -50,7 +46,7 @@ deadlock_detection = ["dep:backtrace"]
 
 ## If set, epaint will use `include_bytes!` to bundle some fonts.
 ## If you plan on specifying your own fonts you may disable this feature.
-default_fonts = []
+default_fonts = ["epaint_default_fonts"]
 
 ## Turn on the `log` feature, that makes egui log some errors using the [`log`](https://docs.rs/log) crate.
 log = ["dep:log"]
@@ -96,6 +92,8 @@ rayon = { version = "1.7", optional = true }
 ## Allow serialization using [`serde`](https://docs.rs/serde) .
 serde = { workspace = true, optional = true, features = ["derive", "rc"] }
 
+epaint_default_fonts = { workspace = true, optional = true }
+
 # native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 backtrace = { workspace = true, optional = true }

crates/epaint/src/text/fonts.rs

@@ -10,6 +10,9 @@ use crate::{
 };
 use emath::{NumExt as _, OrderedFloat};
 
+#[cfg(feature = "default_fonts")]
+use epaint_default_fonts::{EMOJI_ICON, HACK_REGULAR, NOTO_EMOJI_REGULAR, UBUNTU_LIGHT};
+
 // ----------------------------------------------------------------------------
 
 /// How to select a sized font.
@@ -217,7 +220,7 @@ fn ab_glyph_font_from_font_data(name: &str, data: &FontData) -> ab_glyph::FontAr
 ///
 /// // Install my own font (maybe supporting non-latin characters):
 /// fonts.font_data.insert("my_font".to_owned(),
-///    FontData::from_static(include_bytes!("../../fonts/Ubuntu-Light.ttf"))); // .ttf and .otf supported
+///    FontData::from_static(include_bytes!("../../../epaint_default_fonts/fonts/Ubuntu-Light.ttf"))); // .ttf and .otf supported
 ///
 /// // Put my font first (highest priority):
 /// fonts.families.get_mut(&FontFamily::Proportional).unwrap()
@@ -263,39 +266,32 @@ impl Default for FontDefinitions {
 
         let mut families = BTreeMap::new();
 
-        font_data.insert(
-            "Hack".to_owned(),
-            FontData::from_static(include_bytes!("../../fonts/Hack-Regular.ttf")),
-        );
+        font_data.insert("Hack".to_owned(), FontData::from_static(HACK_REGULAR));
         font_data.insert(
             "Ubuntu-Light".to_owned(),
-            FontData::from_static(include_bytes!("../../fonts/Ubuntu-Light.ttf")),
+            FontData::from_static(UBUNTU_LIGHT),
         );
 
         // Some good looking emojis. Use as first priority:
         font_data.insert(
             "NotoEmoji-Regular".to_owned(),
-            FontData::from_static(include_bytes!("../../fonts/NotoEmoji-Regular.ttf")).tweak(
-                FontTweak {
+            FontData::from_static(NOTO_EMOJI_REGULAR).tweak(FontTweak {
                 scale: 0.81, // make it smaller
                 ..Default::default()
-                },
-            ),
+            }),
         );
 
         // Bigger emojis, and more. <http://jslegers.github.io/emoji-icon-font/>:
         font_data.insert(
             "emoji-icon-font".to_owned(),
-            FontData::from_static(include_bytes!("../../fonts/emoji-icon-font.ttf")).tweak(
-                FontTweak {
+            FontData::from_static(EMOJI_ICON).tweak(FontTweak {
                 scale: 0.88, // make it smaller
 
                 // probably not correct, but this does make texts look better (#2724 for details)
                 y_offset_factor: 0.11, // move glyphs down to better align with common fonts
                 baseline_offset_factor: -0.11, // ...now the entire row is a bit down so shift it back
                 ..Default::default()
-                },
-            ),
+            }),
         );
 
         families.insert(

crates/epaint_default_fonts/CHANGELOG.md

@@ -0,0 +1,9 @@
+# `epaint_default_fonts` changelog
+All notable changes to the `epaint_default_fonts` crate will be documented in this file.
+
+This file is updated upon each release.
+Changes since the last release can be found at <https://github.com/emilk/egui/compare/latest...HEAD> or by running the `scripts/generate_changelog.py` script.
+
+
+## 0.28.1 - 2024-07-05
+Crate added.

crates/epaint_default_fonts/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "epaint_default_fonts"
+version.workspace = true
+authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
+description = "Default fonts for use in epaint / egui"
+edition.workspace = true
+rust-version.workspace = true
+homepage = "https://github.com/emilk/egui/tree/master/crates/epaint_default_fonts"
+license = "(MIT OR Apache-2.0) AND OFL-1.1 AND LicenseRef-UFL-1.0" # OFL and UFL are from the font files themselves.
+readme = "README.md"
+repository = "https://github.com/emilk/egui/tree/master/crates/epaint_default_fonts"
+categories = ["graphics", "gui"]
+keywords = ["graphics", "gui", "egui"]
+include = [
+  "../LICENSE-APACHE",
+  "../LICENSE-MIT",
+  "**/*.rs",
+  "Cargo.toml",
+  "fonts/*.ttf",
+  "fonts/*.txt",
+  "fonts/OFL.txt",
+  "fonts/UFL.txt",
+]
+
+[lints]
+workspace = true
+
+[package.metadata.docs.rs]
+all-features = true

crates/epaint_default_fonts/README.md

@@ -0,0 +1,11 @@
+# `epaint_default_fonts` -  fonts for epaint and egui
+
+[![Latest version](https://img.shields.io/crates/v/epaint_default_fonts.svg)](https://crates.io/crates/epaint_default_fonts)
+[![Documentation](https://docs.rs/epaint_default_fonts/badge.svg)](https://docs.rs/epaint_default_fonts)
+[![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/)
+![MIT](https://img.shields.io/badge/license-MIT-blue.svg)
+![Apache](https://img.shields.io/badge/license-Apache-blue.svg)
+
+Default fonts that are used in `epaint` and `egui`. Not intended for use as a standalone library.
+
+Made for [`egui`](https://github.com/emilk/egui/).

crates/epaint_default_fonts/src/lib.rs

@@ -0,0 +1,47 @@
+//! A library containing built-in fonts for `epaint`, embedded as bytes.
+//!
+//! This is intended to be consumed through the `epaint` crate.
+
+/// A typeface designed for source code.
+///
+/// Hack is designed to be a workhorse typeface for source code. It has deep
+/// roots in the free, open source typeface community and expands upon the
+/// contributions of the [Bitstream Vera](https://www.gnome.org/fonts/) and
+/// [DejaVu](https://dejavu-fonts.github.io/) projects.  The large x-height +
+/// wide aperture + low contrast design make it legible at commonly used source
+/// code text sizes with a sweet spot that runs in the 8 - 14 range.
+///
+/// See [the Hack repository](https://github.com/source-foundry/Hack) for more
+/// information.
+pub const HACK_REGULAR: &[u8] = include_bytes!("../fonts/Hack-Regular.ttf");
+
+/// A typeface containing emoji characters as designed for the Noto font family.
+///
+/// Noto is a collection of high-quality fonts with multiple weights and widths
+/// in sans, serif, mono, and other styles, in more than 1,000 languages and
+/// over 150 writing systems. Noto Emoji contains black-and-white emoji
+/// characters that match Google's emoji designs.
+///
+/// See [Google Fonts](https://fonts.google.com/noto/specimen/Noto+Emoji) for
+/// more information.
+pub const NOTO_EMOJI_REGULAR: &[u8] = include_bytes!("../fonts/NotoEmoji-Regular.ttf");
+
+/// A typeface designed for use by Ubuntu.
+///
+/// The Ubuntu typeface has been specially created to complement the Ubuntu tone
+/// of voice. It has a contemporary style and contains characteristics unique to
+/// the Ubuntu brand that convey a precise, reliable and free attitude.
+///
+/// See [Ubuntu design](https://design.ubuntu.com/font) for more information.
+pub const UBUNTU_LIGHT: &[u8] = include_bytes!("../fonts/Ubuntu-Light.ttf");
+
+/// An experimental typeface that uses standardized
+/// [UNICODE planes](http://en.wikipedia.org/wiki/Plane_(Unicode))
+/// for icon fonts.
+///
+/// The icons in this font are designed to be styled with minimal effort. Each
+/// icon is solid, which is useful for changing icon colors.
+///
+/// See [the `emoji-icon-font` repository](https://github.com/jslegers/emoji-icon-font)
+/// for more information.
+pub const EMOJI_ICON: &[u8] = include_bytes!("../fonts/emoji-icon-font.ttf");

examples/custom_font/src/main.rs

@@ -25,7 +25,7 @@ fn setup_custom_fonts(ctx: &egui::Context) {
     fonts.font_data.insert(
         "my_font".to_owned(),
         egui::FontData::from_static(include_bytes!(
-            "../../../crates/epaint/fonts/Hack-Regular.ttf"
+            "../../../crates/epaint_default_fonts/fonts/Hack-Regular.ttf"
         )),
     );
 

scripts/generate_changelog.py

@@ -228,6 +228,7 @@ def main() -> None:
         "egui-winit",
         "egui",
         "epaint",
+        "epaint_default_fonts",
     ]
 
     # We read all existing changelogs to remove duplicate entries.