split out gui options

src/cli.rs

@@ -0,0 +1,57 @@
+use clap::Parser;
+
+#[derive(Parser, Debug)]
+pub struct Cli {
+    #[arg(
+        long,
+        default_value = "0.0.0.0:2342",
+        help = "address and port to bind to"
+    )]
+    pub bind: String,
+    #[arg(
+        short,
+        long,
+        help = "Set default log level lower. You can also change this via the RUST_LOG environment variable."
+    )]
+    pub debug: bool,
+    #[arg(
+        short,
+        long,
+        help = "The name of the font family to use. This defaults to the system monospace font."
+    )]
+    pub font: Option<String>,
+    #[clap(flatten)]
+    pub gui: GuiOptions,
+}
+
+#[derive(Parser, Debug)]
+pub struct GuiOptions {
+    #[arg(
+        short,
+        long,
+        default_value_t = false,
+        help = "Use the red color channel"
+    )]
+    pub red: bool,
+    #[arg(
+        short,
+        long,
+        default_value_t = false,
+        help = "Use the green color channel"
+    )]
+    pub green: bool,
+    #[arg(
+        short,
+        long,
+        default_value_t = false,
+        help = "Use the blue color channel"
+    )]
+    pub blue: bool,
+    #[arg(
+        short,
+        long,
+        default_value_t = false,
+        help = "add spacers between tile rows to simulate gaps in real display"
+    )]
+    pub spacers: bool,
+}

src/cp437_font.rs

@@ -18,7 +18,17 @@ impl Cp437Font {
 
 impl Default for Cp437Font {
     fn default() -> Self {
-        load_static()
+        let mut bitmaps =
+            core::array::from_fn(|_| Bitmap::new(TILE_SIZE, TILE_SIZE));
+
+        for (char_code, bitmap) in bitmaps.iter_mut().enumerate() {
+            let bits = CP437_FONT_LINEAR[char_code];
+            let mut bytes = bits.to_be_bytes();
+            bytes.reverse();
+            bitmap.data_ref_mut().copy_from_slice(bytes.as_slice());
+        }
+
+        Self::new(bitmaps)
     }
 }
 
@@ -281,17 +291,3 @@ pub(crate) const CP437_FONT_LINEAR: [u64; 256] = [
     0x00007c7c7c7c7c00, // 0xfe
     0x0000000000000000, // 0xff
 ];
-
-fn load_static() -> Cp437Font {
-    let mut bitmaps =
-        core::array::from_fn(|_| Bitmap::new(TILE_SIZE, TILE_SIZE));
-
-    for (char_code, bitmap) in bitmaps.iter_mut().enumerate() {
-        let bits = CP437_FONT_LINEAR[char_code];
-        let mut bytes = bits.to_be_bytes();
-        bytes.reverse();
-        bitmap.data_ref_mut().copy_from_slice(bytes.as_slice());
-    }
-
-    Cp437Font::new(bitmaps)
-}

src/execute_command.rs

@@ -1,5 +1,5 @@
 use crate::execute_command::ExecutionResult::{Failure, Shutdown, Success};
-use crate::font::Cp437Font;
+use crate::cp437_font::Cp437Font;
 use crate::font_renderer::FontRenderer8x8;
 use log::{debug, error, info, trace, warn};
 use servicepoint::{
@@ -13,7 +13,7 @@ pub struct CommandExecutor<'t> {
     display: &'t RwLock<Bitmap>,
     luma: &'t RwLock<BrightnessGrid>,
     cp437_font: Cp437Font,
-    utf8_font: FontRenderer8x8,
+    font_renderer: FontRenderer8x8,
 }
 
 #[must_use]
@@ -27,11 +27,12 @@ impl<'t> CommandExecutor<'t> {
     pub fn new(
         display: &'t RwLock<Bitmap>,
         luma: &'t RwLock<BrightnessGrid>,
+        font_renderer: FontRenderer8x8,
     ) -> Self {
         CommandExecutor {
             display,
             luma,
-            utf8_font: FontRenderer8x8::default(),
+            font_renderer,
             cp437_font: Cp437Font::default(),
         }
     }
@@ -190,7 +191,7 @@ impl<'t> CommandExecutor<'t> {
                 let tile_x = char_x + x;
                 let tile_y = char_y + y;
 
-                if let Err(e) = self.utf8_font.render(
+                if let Err(e) = self.font_renderer.render(
                     char,
                     &mut display,
                     Origin::new(tile_x * TILE_SIZE, tile_y * TILE_SIZE),

src/font_renderer.rs

@@ -43,12 +43,13 @@ pub enum RenderError {
 }
 
 impl FontRenderer8x8 {
-    pub fn new(font: Font, fallback_char: Option<char>) -> Self {
+    const FALLBACK_CHAR: char = '?';
+    pub fn new(font: Font) -> Self {
         let canvas =
             Canvas::new(vec2i(TILE_SIZE as i32, TILE_SIZE as i32), Format::A8);
         assert_eq!(canvas.pixels.len(), TILE_SIZE * TILE_SIZE);
         assert_eq!(canvas.stride, TILE_SIZE);
-        let fallback_char = fallback_char.and_then(|c| font.glyph_for_char(c));
+        let fallback_char = font.glyph_for_char(Self::FALLBACK_CHAR);
         let result = Self {
             font: SendFont(font),
             fallback_char,
@@ -57,6 +58,15 @@ impl FontRenderer8x8 {
         result
     }
 
+    pub fn from_name(family_name: String) -> Self {
+        let font = SystemSource::new()
+            .select_best_match(&[FamilyName::Title(family_name)], &Properties::new())
+            .unwrap()
+            .load()
+            .unwrap();
+        Self::new(font)
+    }
+
     pub fn render(
         &self,
         char: char,
@@ -104,17 +114,10 @@ impl FontRenderer8x8 {
 impl Default for FontRenderer8x8 {
     fn default() -> Self {
         let utf8_font = SystemSource::new()
-            .select_best_match(
-                &[
-                    FamilyName::Title("Roboto Mono".to_string()),
-                    FamilyName::Title("Fira Mono".to_string()),
-                    FamilyName::Monospace,
-                ],
-                &Properties::new(),
-            )
+            .select_best_match(&[FamilyName::Monospace], &Properties::new())
             .unwrap()
             .load()
             .unwrap();
-        FontRenderer8x8::new(utf8_font, Some('?'))
+        FontRenderer8x8::new(utf8_font)
     }
 }

src/gui.rs

@@ -12,14 +12,14 @@ use winit::event_loop::ActiveEventLoop;
 use winit::keyboard::KeyCode::KeyC;
 use winit::window::{Window, WindowId};
 
-use crate::Cli;
+use crate::cli::{GuiOptions};
 
 pub struct Gui<'t> {
     display: &'t RwLock<Bitmap>,
     luma: &'t RwLock<BrightnessGrid>,
     window: Option<Window>,
     stop_udp_tx: Sender<()>,
-    cli: &'t Cli,
+    options: GuiOptions,
     logical_size: LogicalSize<u16>,
 }
 
@@ -41,15 +41,15 @@ impl<'t> Gui<'t> {
         display: &'t RwLock<Bitmap>,
         luma: &'t RwLock<BrightnessGrid>,
         stop_udp_tx: Sender<()>,
-        cli: &'t Cli,
+        options: GuiOptions,
     ) -> Self {
         Gui {
+            window: None,
+            logical_size: Self::get_logical_size(options.spacers),
             display,
             luma,
             stop_udp_tx,
-            cli,
-            window: None,
-            logical_size: Self::get_logical_size(cli.spacers),
+            options,
         }
     }
 
@@ -79,7 +79,7 @@ impl<'t> Gui<'t> {
         let brightness_scale = (u8::MAX as f32) / (u8::from(Brightness::MAX) as f32);
 
         for tile_y in 0..TILE_HEIGHT {
-            if self.cli.spacers && tile_y != 0 {
+            if self.options.spacers && tile_y != 0 {
                 // cannot just frame.skip(PIXEL_WIDTH as usize * SPACER_HEIGHT as usize) because of typing
                 for _ in 0..PIXEL_WIDTH * SPACER_HEIGHT {
                     frame.next().unwrap();
@@ -105,9 +105,9 @@ impl<'t> Gui<'t> {
 
     fn get_on_color(&self, brightness: u8) -> [u8; 4] {
         [
-            if self.cli.red { brightness } else { 0u8 },
-            if self.cli.green { brightness } else { 0u8 },
-            if self.cli.blue { brightness } else { 0u8 },
+            if self.options.red { brightness } else { 0u8 },
+            if self.options.green { brightness } else { 0u8 },
+            if self.options.blue { brightness } else { 0u8 },
             255,
         ]
     }

src/main.rs

@@ -11,89 +11,37 @@ use std::io::ErrorKind;
 use std::net::UdpSocket;
 use std::sync::{mpsc, RwLock};
 use std::time::Duration;
-use winit::event_loop::{ControlFlow, EventLoop};
+use winit::event_loop::{ControlFlow, EventLoop, EventLoopProxy};
+use cli::Cli;
+use crate::font_renderer::FontRenderer8x8;
 
 mod execute_command;
-mod font;
+mod cp437_font;
 mod font_renderer;
 mod gui;
-
-#[derive(Parser, Debug)]
-struct Cli {
-    #[arg(
-        long,
-        default_value = "0.0.0.0:2342",
-        help = "address and port to bind to"
-    )]
-    bind: String,
-    #[arg(
-        short,
-        long,
-        default_value_t = false,
-        help = "add spacers between tile rows to simulate gaps in real display"
-    )]
-    spacers: bool,
-    #[arg(
-        short,
-        long,
-        help = "Set default log level lower. You can also change this via the RUST_LOG environment variable."
-    )]
-    debug: bool,
-    #[arg(
-        short,
-        long,
-        default_value_t = false,
-        help = "Use the red color channel"
-    )]
-    red: bool,
-    #[arg(
-        short,
-        long,
-        default_value_t = false,
-        help = "Use the green color channel"
-    )]
-    green: bool,
-    #[arg(
-        short,
-        long,
-        default_value_t = false,
-        help = "Use the blue color channel"
-    )]
-    blue: bool,
-}
+mod cli;
 
 const BUF_SIZE: usize = 8985;
 
 fn main() {
     let mut cli = Cli::parse();
-
-    env_logger::builder()
-        .filter_level(if cli.debug {
-            LevelFilter::Debug
-        } else {
-            LevelFilter::Info
-        })
-        .parse_default_env()
-        .init();
-
-    if !(cli.red || cli.blue || cli.green) {
-        cli.green = true;
+    if !(cli.gui.red || cli.gui.blue || cli.gui.green) {
+        cli.gui.green = true;
     }
 
+    init_logging(cli.debug);
     info!("starting with args: {:?}", &cli);
+
     let socket = UdpSocket::bind(&cli.bind).expect("could not bind socket");
     socket
         .set_nonblocking(true)
         .expect("could not enter non blocking mode");
 
     let display = RwLock::new(Bitmap::new(PIXEL_WIDTH, PIXEL_HEIGHT));
-
-    let mut luma = BrightnessGrid::new(TILE_WIDTH, TILE_HEIGHT);
-    luma.fill(Brightness::MAX);
-    let luma = RwLock::new(luma);
+    let luma = RwLock::new(BrightnessGrid::new(TILE_WIDTH, TILE_HEIGHT));
 
     let (stop_udp_tx, stop_udp_rx) = mpsc::channel();
-    let mut app = Gui::new(&display, &luma, stop_udp_tx, &cli);
+    let mut gui = Gui::new(&display, &luma, stop_udp_tx, cli.gui);
 
     let event_loop = EventLoop::with_user_event()
         .build()
@@ -101,7 +49,9 @@ fn main() {
     event_loop.set_control_flow(ControlFlow::Wait);
 
     let event_proxy = event_loop.create_proxy();
-    let command_executor = CommandExecutor::new(&display, &luma);
+    let font_renderer = cli.font.map(move |font| FontRenderer8x8::from_name(font))
+        .unwrap_or_else(move || FontRenderer8x8::default());
+    let command_executor = CommandExecutor::new(&display, &luma, font_renderer);
 
     std::thread::scope(move |scope| {
         scope.spawn(move || {
@@ -117,29 +67,45 @@ fn main() {
                     None => continue,
                 };
 
-                match command_executor.execute(command) {
-                    ExecutionResult::Success => {
-                        event_proxy
-                            .send_event(AppEvents::UdpPacketHandled)
-                            .expect("could not send packet handled event");
-                    }
-                    ExecutionResult::Failure => {
-                        error!("failed to execute command");
-                    }
-                    ExecutionResult::Shutdown => {
-                        event_proxy
-                            .send_event(AppEvents::UdpThreadClosed)
-                            .expect("could not send close event");
-                    }
-                }
+                handle_command(&event_proxy, &command_executor, command);
             }
         });
         event_loop
-            .run_app(&mut app)
+            .run_app(&mut gui)
             .expect("could not run event loop");
     });
 }
 
+fn handle_command(event_proxy: &EventLoopProxy<AppEvents>, command_executor: &CommandExecutor, command: Command) {
+    match command_executor.execute(command) {
+        ExecutionResult::Success => {
+            event_proxy
+                .send_event(AppEvents::UdpPacketHandled)
+                .expect("could not send packet handled event");
+        }
+        ExecutionResult::Failure => {
+            error!("failed to execute command");
+        }
+        ExecutionResult::Shutdown => {
+            event_proxy
+                .send_event(AppEvents::UdpThreadClosed)
+                .expect("could not send close event");
+        }
+    }
+}
+
+fn init_logging(debug: bool) {
+    let filter = if debug {
+        LevelFilter::Debug
+    } else {
+        LevelFilter::Info
+    };
+    env_logger::builder()
+        .filter_level(filter)
+        .parse_default_env()
+        .init();
+}
+
 fn command_from_slice(slice: &[u8]) -> Option<Command> {
     let package = match servicepoint::Packet::try_from(slice) {
         Err(_) => {