feat(display): DrawText with built-in Spleen 8x16 font (BSD-2)

crates/servers/display-server/src/protocol.rs

@@ -1,4 +1,5 @@
 use server_framework::{Decode, Encode};
+use types::display::text::Text;
 use types::display::{Color, Dimension, ScreenCoord};
 
 #[derive(Debug, PartialEq)]
@@ -7,6 +8,7 @@ pub enum DisplayRequest {
     Clear { color: Color },
     Flush,
     GetDimensions,
+    DrawText(Text),
 }
 
 #[derive(Debug, PartialEq)]
@@ -27,6 +29,7 @@ impl Encode for DisplayRequest {
             DisplayRequest::Clear { color } => [1, color.raw() as usize, 0, 0],
             DisplayRequest::Flush => [2, 0, 0, 0],
             DisplayRequest::GetDimensions => [3, 0, 0, 0],
+            DisplayRequest::DrawText(t) => t.words(),
         }
     }
 }
@@ -45,7 +48,7 @@ impl Decode for DisplayRequest {
             1 => Some(DisplayRequest::Clear { color: Color::from_raw(words[1] as u32) }),
             2 => Some(DisplayRequest::Flush),
             3 => Some(DisplayRequest::GetDimensions),
-            _ => None,
+            _ => Text::from_words(words).map(DisplayRequest::DrawText),
         }
     }
 }