feat(melpo): Makes scaling an option (#236)

This PR makes UI scaling a config file option

Author: jamesmunns

platforms/melpomene/melpo-config/src/lib.rs

@@ -90,18 +90,25 @@ pub struct DisplayConfig {
     /// The maximum number of frames per second. Must be >= 1
     #[serde(default = "DisplayConfig::default_frames_per_second")]
     pub frames_per_second: usize,
+    /// The scaling of the display
+    #[serde(default = "DisplayConfig::default_scaling")]
+    pub scaling: u32,
 }
 
 impl DisplayConfig {
     pub const DEFAULT_KCHANNEL_DEPTH: usize = 2;
     pub const DEFAULT_FRAMES_PER_SECOND: usize = 20;
+    pub const DEFAULT_SCALING: u32 = 2;
 
     const fn default_kchannel_depth() -> usize {
         Self::DEFAULT_KCHANNEL_DEPTH
     }
     const fn default_frames_per_second() -> usize {
         Self::DEFAULT_FRAMES_PER_SECOND
     }
+    const fn default_scaling() -> u32 {
+        Self::DEFAULT_SCALING
+    }
 }
 
 #[derive(Debug, Serialize, Deserialize)]

platforms/melpomene/melpo.toml

@@ -42,6 +42,7 @@ enabled = true
 enabled = true
 # kchannel_depth = 2
 # frames_per_second = 20
+# scaling = 2
 
 [platform.tcp_uart]
 enabled = true

platforms/melpomene/src/sim_drivers/emb_display.rs

@@ -75,9 +75,7 @@ impl SimDisplay {
             height,
         };
 
-        kernel
-            .spawn(commander.run(width, height, settings.frames_per_second))
-            .await;
+        kernel.spawn(commander.run(width, height, settings)).await;
 
         kernel
             .with_registry(|reg| reg.register_konly::<EmbDisplayService>(&cmd_prod))
@@ -113,9 +111,10 @@ struct Context {
 
 impl CommanderTask {
     /// The entrypoint for the driver execution
-    async fn run(self, width: u32, height: u32, frames_per_second: usize) {
+    async fn run(self, width: u32, height: u32, settings: DisplayConfig) {
         let output_settings = OutputSettingsBuilder::new()
             .theme(BinaryColorTheme::OledBlue)
+            .scale(settings.scaling)
             .build();
 
         let bytes = (width * height) as usize;
@@ -146,7 +145,7 @@ impl CommanderTask {
         self.kernel
             .spawn({
                 let mutex = mutex.clone();
-                render_loop(self.kernel, mutex, frames_per_second)
+                render_loop(self.kernel, mutex, settings.frames_per_second)
             })
             .await;