Initial commit

breadlock-ui/src/config.rs

@@ -0,0 +1,111 @@
+use serde::Deserialize;
+use std::path::Path;
+
+/// Appearance settings shared by `breadlock.toml` and `breadgreet.toml`.
+/// `breadgreet` embeds this and adds its own `[sessions]` table.
+#[derive(Debug, Clone, Default, Deserialize)]
+#[serde(default)]
+pub struct Appearance {
+    pub background: Background,
+    pub clock: Clock,
+    pub font: Font,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum BackgroundMode {
+    Color,
+    Image,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(default)]
+pub struct Background {
+    pub mode: BackgroundMode,
+    pub path: String,
+    /// v2 feature flag — no-op (with a warning) in v1, which only supports a
+    /// static color or image background.
+    pub blur: bool,
+}
+
+impl Default for Background {
+    fn default() -> Self {
+        Self {
+            mode: BackgroundMode::Color,
+            path: String::new(),
+            blur: false,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(default)]
+pub struct Clock {
+    pub format: String,
+}
+
+impl Default for Clock {
+    fn default() -> Self {
+        Self {
+            format: "%H:%M".to_string(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(default)]
+pub struct Font {
+    pub family: String,
+}
+
+impl Default for Font {
+    fn default() -> Self {
+        Self {
+            family: bread_theme::tokens::FONT_FAMILY
+                .split(',')
+                .next()
+                .unwrap_or("Varela Round")
+                .trim()
+                .to_string(),
+        }
+    }
+}
+
+/// Reads and parses a TOML config file, falling back to `T::default()` if the
+/// file is missing or malformed — every bread* app runs with sensible
+/// defaults and no required config.
+pub fn load_or_default<T: serde::de::DeserializeOwned + Default>(path: &Path) -> T {
+    std::fs::read_to_string(path)
+        .ok()
+        .and_then(|s| toml::from_str(&s).ok())
+        .unwrap_or_default()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn defaults_match_design_system() {
+        let a = Appearance::default();
+        assert_eq!(a.background.mode, BackgroundMode::Color);
+        assert_eq!(a.clock.format, "%H:%M");
+        assert_eq!(a.font.family, "Varela Round");
+    }
+
+    #[test]
+    fn missing_file_falls_back_to_default() {
+        let a: Appearance = load_or_default(Path::new("/nonexistent/breadlock-test.toml"));
+        assert_eq!(a.font.family, "Varela Round");
+    }
+
+    #[test]
+    fn parses_partial_toml_with_defaults_for_rest() {
+        let dir = std::env::temp_dir().join("breadlock-ui-test-partial.toml");
+        std::fs::write(&dir, "[clock]\nformat = \"%I:%M %p\"\n").unwrap();
+        let a: Appearance = load_or_default(&dir);
+        assert_eq!(a.clock.format, "%I:%M %p");
+        assert_eq!(a.background.mode, BackgroundMode::Color);
+        std::fs::remove_file(&dir).ok();
+    }
+}

breadlock-ui/src/desktop_entry.rs

@@ -0,0 +1,134 @@
+//! Minimal freedesktop `.desktop` entry parsing — just enough to discover
+//! session launchers (`Name=`, `Exec=`, `Type=`) under
+//! `/usr/share/wayland-sessions` and `/usr/share/xsessions`. BOS only ships
+//! one session today, so this deliberately doesn't handle the full spec
+//! (localized `Name[xx]=`, `Exec=` quoting/field codes, `Actions=`, etc.) —
+//! only the three keys a greeter needs to list and launch a session.
+
+use std::path::Path;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct DesktopEntry {
+    pub name: String,
+    pub exec: String,
+    pub entry_type: String,
+}
+
+/// Parses the `[Desktop Entry]` section of a `.desktop` file's contents.
+/// Returns `None` if `Name=` or `Exec=` is missing.
+pub fn parse(contents: &str) -> Option<DesktopEntry> {
+    let mut name = None;
+    let mut exec = None;
+    let mut entry_type = None;
+    let mut in_desktop_entry = false;
+
+    for line in contents.lines() {
+        let line = line.trim();
+        if line.is_empty() || line.starts_with('#') {
+            continue;
+        }
+        if let Some(section) = line.strip_prefix('[').and_then(|s| s.strip_suffix(']')) {
+            in_desktop_entry = section == "Desktop Entry";
+            continue;
+        }
+        if !in_desktop_entry {
+            continue;
+        }
+        if let Some((key, value)) = line.split_once('=') {
+            match key.trim() {
+                "Name" => name = Some(value.trim().to_string()),
+                "Exec" => exec = Some(value.trim().to_string()),
+                "Type" => entry_type = Some(value.trim().to_string()),
+                _ => {}
+            }
+        }
+    }
+
+    Some(DesktopEntry {
+        name: name?,
+        exec: exec?,
+        entry_type: entry_type.unwrap_or_else(|| "Application".to_string()),
+    })
+}
+
+/// Scans a directory for `*.desktop` files, returning `(file stem, entry)`
+/// pairs. Unreadable directories and unparsable entries are silently skipped
+/// — a missing session directory is normal (e.g. no X11 sessions installed).
+pub fn scan_dir(dir: &Path) -> Vec<(String, DesktopEntry)> {
+    let Ok(read_dir) = std::fs::read_dir(dir) else {
+        return Vec::new();
+    };
+
+    let mut entries: Vec<(String, DesktopEntry)> = read_dir
+        .filter_map(|e| e.ok())
+        .filter(|e| e.path().extension().is_some_and(|ext| ext == "desktop"))
+        .filter_map(|e| {
+            let stem = e.path().file_stem()?.to_str()?.to_string();
+            let contents = std::fs::read_to_string(e.path()).ok()?;
+            Some((stem, parse(&contents)?))
+        })
+        .collect();
+
+    entries.sort_by(|a, b| a.0.cmp(&b.0));
+    entries
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const HYPRLAND_DESKTOP: &str = "[Desktop Entry]\n\
+        Name=Hyprland\n\
+        Comment=An intelligent dynamic tiling Wayland compositor\n\
+        Exec=Hyprland\n\
+        Type=Application\n";
+
+    #[test]
+    fn parses_name_exec_type() {
+        let e = parse(HYPRLAND_DESKTOP).unwrap();
+        assert_eq!(e.name, "Hyprland");
+        assert_eq!(e.exec, "Hyprland");
+        assert_eq!(e.entry_type, "Application");
+    }
+
+    #[test]
+    fn ignores_keys_outside_desktop_entry_section() {
+        let contents = "[Desktop Action foo]\nName=Not this one\n\
+            [Desktop Entry]\nName=Real\nExec=real-cmd\n";
+        let e = parse(contents).unwrap();
+        assert_eq!(e.name, "Real");
+        assert_eq!(e.exec, "real-cmd");
+    }
+
+    #[test]
+    fn missing_exec_returns_none() {
+        assert!(parse("[Desktop Entry]\nName=Broken\n").is_none());
+    }
+
+    #[test]
+    fn missing_type_defaults_to_application() {
+        let e = parse("[Desktop Entry]\nName=X\nExec=x\n").unwrap();
+        assert_eq!(e.entry_type, "Application");
+    }
+
+    #[test]
+    fn scan_dir_on_missing_directory_returns_empty() {
+        assert!(scan_dir(Path::new("/nonexistent/wayland-sessions")).is_empty());
+    }
+
+    #[test]
+    fn scan_dir_finds_and_sorts_desktop_files() {
+        let dir = std::env::temp_dir().join("breadlock-ui-test-sessions");
+        std::fs::create_dir_all(&dir).unwrap();
+        std::fs::write(dir.join("zzz.desktop"), HYPRLAND_DESKTOP).unwrap();
+        std::fs::write(dir.join("aaa.desktop"), "[Desktop Entry]\nName=A\nExec=a\n").unwrap();
+        std::fs::write(dir.join("not-a-session.txt"), "ignored").unwrap();
+
+        let found = scan_dir(&dir);
+        assert_eq!(found.len(), 2);
+        assert_eq!(found[0].0, "aaa");
+        assert_eq!(found[1].0, "zzz");
+
+        std::fs::remove_dir_all(&dir).ok();
+    }
+}

breadlock-ui/src/lib.rs

@@ -0,0 +1,6 @@
+pub mod config;
+pub mod desktop_entry;
+pub mod theme;
+
+#[cfg(feature = "paint")]
+pub mod painter;

breadlock-ui/src/painter.rs

@@ -0,0 +1,171 @@
+//! Software-rendering primitives shared by `breadlock`'s frame composition:
+//! rounded-rect paths (radius tokens from [`bread_theme::tokens`]) and text
+//! layout/rasterization via `cosmic-text`, blitted into a `tiny-skia`
+//! `Pixmap`. Only linked into `breadlock` — `breadgreet` draws through GTK/CSS
+//! instead and doesn't need a font-shaping stack.
+
+pub use bread_theme::tokens;
+use cosmic_text::{Attrs, Buffer, Family, FontSystem, Metrics, Shaping, SwashCache};
+use tiny_skia::{Path, PathBuilder, Pixmap, PremultipliedColorU8};
+
+/// Builds a rounded-rectangle path. `radius` is clamped so it never exceeds
+/// half the shorter side (a degenerate radius would otherwise self-intersect).
+pub fn rounded_rect(x: f32, y: f32, w: f32, h: f32, radius: f32) -> Option<Path> {
+    let r = radius.max(0.0).min(w / 2.0).min(h / 2.0);
+    let mut pb = PathBuilder::new();
+    pb.move_to(x + r, y);
+    pb.line_to(x + w - r, y);
+    pb.quad_to(x + w, y, x + w, y + r);
+    pb.line_to(x + w, y + h - r);
+    pb.quad_to(x + w, y + h, x + w - r, y + h);
+    pb.line_to(x + r, y + h);
+    pb.quad_to(x, y + h, x, y + h - r);
+    pb.line_to(x, y + r);
+    pb.quad_to(x, y, x + r, y);
+    pb.close();
+    pb.finish()
+}
+
+/// Owns the font database and glyph raster cache. Expensive to create
+/// (`FontSystem::new()` scans installed fonts), so construct once and reuse
+/// across every frame.
+pub struct TextRenderer {
+    font_system: FontSystem,
+    swash_cache: SwashCache,
+}
+
+impl Default for TextRenderer {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl TextRenderer {
+    pub fn new() -> Self {
+        Self {
+            font_system: FontSystem::new(),
+            swash_cache: SwashCache::new(),
+        }
+    }
+
+    fn shape_line(&mut self, text: &str, family: &str, size_px: f32, max_width: f32) -> Buffer {
+        let metrics = Metrics::new(size_px, size_px * 1.25);
+        let mut buffer = Buffer::new(&mut self.font_system, metrics);
+        buffer.set_size(&mut self.font_system, Some(max_width), Some(size_px * 2.0));
+        let attrs = Attrs::new().family(Family::Name(family));
+        buffer.set_text(&mut self.font_system, text, &attrs, Shaping::Advanced);
+        buffer.shape_until_scroll(&mut self.font_system, false);
+        buffer
+    }
+
+    /// Width in pixels `text` would occupy if drawn via [`Self::draw_line`]
+    /// with the same `family`/`size_px` — use to center text before drawing.
+    pub fn measure_line(&mut self, text: &str, family: &str, size_px: f32) -> f32 {
+        let buffer = self.shape_line(text, family, size_px, f32::INFINITY);
+        buffer
+            .layout_runs()
+            .map(|run| run.line_w)
+            .fold(0.0, f32::max)
+    }
+
+    /// Shapes `text` as a single line in `family` at `size_px` and blits it
+    /// into `pixmap` with its top-left baseline anchor at `(origin_x,
+    /// origin_y)`. Pixels outside `pixmap`'s bounds are silently clipped.
+    #[allow(clippy::too_many_arguments)]
+    pub fn draw_line(
+        &mut self,
+        pixmap: &mut Pixmap,
+        text: &str,
+        family: &str,
+        size_px: f32,
+        color: tiny_skia::Color,
+        origin_x: f32,
+        origin_y: f32,
+    ) {
+        let buffer = self.shape_line(text, family, size_px, pixmap.width() as f32);
+
+        let c8 = color.to_color_u8();
+        let text_color = cosmic_text::Color::rgba(c8.red(), c8.green(), c8.blue(), c8.alpha());
+
+        let (width, height) = (pixmap.width() as i32, pixmap.height() as i32);
+        let ox = origin_x as i32;
+        let oy = origin_y as i32;
+        buffer.draw(
+            &mut self.font_system,
+            &mut self.swash_cache,
+            text_color,
+            |x, y, _w, _h, glyph_color| {
+                let (px, py) = (ox + x, oy + y);
+                if px < 0 || py < 0 || px >= width || py >= height {
+                    return;
+                }
+                let (r, g, b, a) = glyph_color.as_rgba_tuple();
+                if a == 0 {
+                    return;
+                }
+                blend_over_opaque(pixmap, px as u32, py as u32, r, g, b, a);
+            },
+        );
+    }
+}
+
+/// Alpha-blends a straight-alpha `(r, g, b, a)` source pixel over an
+/// **opaque** destination pixel (always true here — the lock screen
+/// background is painted fully opaque before any text or UI chrome).
+/// Because the destination alpha is always 255, the blended result is also
+/// opaque, so the `PremultipliedColorU8` invariant (`rgb <= a`) always holds.
+fn blend_over_opaque(pixmap: &mut Pixmap, x: u32, y: u32, r: u8, g: u8, b: u8, a: u8) {
+    let idx = (y * pixmap.width() + x) as usize;
+    let pixels = pixmap.pixels_mut();
+    let Some(dst) = pixels.get(idx).copied() else {
+        return;
+    };
+    let a32 = a as u32;
+    let mix = |s: u8, d: u8| -> u8 { ((s as u32 * a32 + d as u32 * (255 - a32)) / 255) as u8 };
+    let blended = PremultipliedColorU8::from_rgba(
+        mix(r, dst.red()),
+        mix(g, dst.green()),
+        mix(b, dst.blue()),
+        255,
+    );
+    if let Some(blended) = blended {
+        pixels[idx] = blended;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn rounded_rect_produces_closed_path() {
+        let path = rounded_rect(0.0, 0.0, 100.0, 40.0, tokens::RADIUS_SECONDARY as f32).unwrap();
+        assert!(!path.is_empty());
+    }
+
+    #[test]
+    fn rounded_rect_clamps_oversized_radius() {
+        // radius larger than half the shorter side must not panic or produce garbage
+        let path = rounded_rect(0.0, 0.0, 10.0, 10.0, 999.0);
+        assert!(path.is_some());
+    }
+
+    #[test]
+    fn text_renderer_draws_without_panicking_on_tiny_pixmap() {
+        let mut pixmap = Pixmap::new(64, 16).unwrap();
+        pixmap.fill(tiny_skia::Color::BLACK);
+        let mut renderer = TextRenderer::new();
+        renderer.draw_line(
+            &mut pixmap,
+            "12:34",
+            "sans-serif",
+            12.0,
+            tiny_skia::Color::WHITE,
+            2.0,
+            2.0,
+        );
+        // No panic and the pixmap remains fully opaque is the property under test —
+        // exact glyph coverage depends on whatever fonts are installed on the CI host.
+        assert!(pixmap.pixels().iter().all(|p| p.alpha() == 255));
+    }
+}

breadlock-ui/src/theme.rs

@@ -0,0 +1,32 @@
+pub use bread_theme::{ink_on, load_palette, Palette};
+
+/// Parse a `#rrggbb` hex colour. Falls back to opaque black on malformed input
+/// (palette slots are always produced by [`bread_theme`], which guarantees
+/// valid hex, but a user-supplied override in a future config field might not).
+pub fn parse_hex(hex: &str) -> (u8, u8, u8) {
+    let h = hex.trim_start_matches('#');
+    let byte = |i: usize| u8::from_str_radix(h.get(i..i + 2).unwrap_or("00"), 16).unwrap_or(0);
+    (byte(0), byte(2), byte(4))
+}
+
+#[cfg(feature = "paint")]
+pub fn tiny_skia_color(hex: &str) -> tiny_skia::Color {
+    let (r, g, b) = parse_hex(hex);
+    tiny_skia::Color::from_rgba8(r, g, b, 255)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parses_known_hex() {
+        assert_eq!(parse_hex("#1e1e2e"), (0x1e, 0x1e, 0x2e));
+        assert_eq!(parse_hex("89b4fa"), (0x89, 0xb4, 0xfa));
+    }
+
+    #[test]
+    fn malformed_hex_falls_back_to_black() {
+        assert_eq!(parse_hex("nope"), (0, 0, 0));
+    }
+}