add brightness tester

crates/servicepoint/examples/brightness_tester.rs

@@ -0,0 +1,37 @@
+//! Show a brightness level test pattern on screen
+
+use clap::Parser;
+
+use servicepoint::Command::BitmapLinearWin;
+use servicepoint::*;
+
+#[derive(Parser, Debug)]
+struct Cli {
+    #[arg(short, long, default_value = "localhost:2342")]
+    destination: String,
+}
+
+fn main() {
+    let cli = Cli::parse();
+    let connection = Connection::open(cli.destination).unwrap();
+
+    let mut pixels = PixelGrid::max_sized();
+    pixels.fill(true);
+
+    connection
+        .send(BitmapLinearWin(
+            Origin(0, 0),
+            pixels,
+            CompressionCode::Uncompressed,
+        ))
+        .expect("send failed");
+
+    let mut brightnesses = ByteGrid::new(TILE_WIDTH, TILE_HEIGHT);
+    for (index, byte) in brightnesses.data_ref_mut().iter_mut().enumerate() {
+        *byte = (index % u8::MAX as usize) as u8;
+    }
+
+    connection
+        .send(Command::CharBrightness(Origin(0, 0), brightnesses))
+        .expect("send failed");
+}