Slow down chars mode.

src/bin/chars/main.rs

@@ -62,20 +62,22 @@ fn main() -> std::io::Result<()> {
     .take(y_size)
     .collect::<Vec<_>>();
     loop {
-        let x = rng.gen_range(0, x_size / 8);
-        let y = rng.gen_range(0, y_size / 8);
-        let color = pick_color(c0, c1, &mut rng);
-        let start_index = rng.gen_range(0, buffer.len() / 8) * 8;
-        for i in 0..8 {
-            let b = buffer[start_index + i];
-            for j in 0..8 {
-                frame[y * 8 + i][x * 8 + j] = {
-                    if b & (1 << j) != 0 {
-                        color
-                    } else {
-                        Color::black()
-                    }
-                };
+        if rng.gen::<f64>() < 0.01 {
+            let x = rng.gen_range(0, x_size / 8);
+            let y = rng.gen_range(0, y_size / 8);
+            let color = pick_color(c0, c1, &mut rng);
+            let start_index = rng.gen_range(0, buffer.len() / 8) * 8;
+            for i in 0..8 {
+                let b = buffer[start_index + i];
+                for j in 0..8 {
+                    frame[y * 8 + i][x * 8 + j] = {
+                        if b & (1 << j) != 0 {
+                            color
+                        } else {
+                            Color::black()
+                        }
+                    };
+                }
             }
         }