Re-center the Plymouth prompt when a display appears late (#11641)

The theme laid out the logo, password entry and progress bar once, when
the script first ran. Plymouth sizes its window to the largest display
present, so a monitor that comes up after plymouthd starts (a Thunderbolt
display whose DisplayPort tunnel is established about a second after the
kernel's display driver loads, a dock, an MST hub) got the prompt drawn at
the internal panel's coordinates: off-center on the external display and
partly off-screen on the panel. With the lid closed the passphrase box was
effectively invisible.

Move the layout into a function and re-run it from the refresh callback
whenever Window.GetWidth/GetHeight change, which is how Plymouth's script
plugin exposes a display being added or removed. Existing bullets are
repositioned too.

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

default/plymouth/omarchy.script

@@ -5,8 +5,6 @@ Window.SetBackgroundBottomColor(0.101, 0.105, 0.149);
 
 logo.image = Image("logo.png");
 logo.sprite = Sprite(logo.image);
-logo.sprite.SetX(Window.GetWidth() / 2 - logo.image.GetWidth() / 2);
-logo.sprite.SetY(Window.GetHeight() / 2 - logo.image.GetHeight() / 2);
 logo.sprite.SetOpacity(1);
 
 # Use these to adjust the progress bar timing
@@ -22,7 +20,18 @@ global.fake_progress_start_time = 0.0;  # Track when fake progress started
 global.password_shown = 0;  # Track if password dialog has been shown
 global.max_progress = 0.0;  # Track the maximum progress reached to prevent backwards movement
 
+# Window size the sprites were last laid out for
+global.layout_width = 0;
+global.layout_height = 0;
+
 fun refresh_callback() {
+  # Displays can show up after this script ran, e.g. a Thunderbolt monitor
+  # whose DisplayPort tunnel comes up after plymouthd started. The window
+  # grows to the largest display, so re-center everything when it changes.
+  if (Window.GetWidth() != global.layout_width || Window.GetHeight() != global.layout_height) {
+    layout();
+  }
+
   global.animation_frame++;
 
   # Animate fake progress to limit over time with easing
@@ -108,27 +117,23 @@ entry.image = Image("entry.png");
 bullet.image = Image("bullet.png");
 
 entry.sprite = Sprite(entry.image);
-entry.x = Window.GetWidth() / 2 - entry.image.GetWidth() / 2;
-entry.y = logo.sprite.GetY() + logo.image.GetHeight() + 40;
-entry.sprite.SetPosition(entry.x, entry.y, 10001);
 entry.sprite.SetOpacity(0);
 
 # Scale lock to be slightly shorter than entry field height
 # Original lock is 84x96, entry height determines scale
-lock_height = entry.image.GetHeight() * 0.8;
-lock_scale = lock_height / 96;
-lock_width = 84 * lock_scale;
+lock.height = entry.image.GetHeight() * 0.8;
+lock.width = 84 * (lock.height / 96);
 
-scaled_lock = lock.image.Scale(lock_width, lock_height);
-lock.sprite = Sprite(scaled_lock);
-lock.x = entry.x - lock_width - 15;
-lock.y = entry.y + entry.image.GetHeight() / 2 - lock_height / 2;
-lock.sprite.SetPosition(lock.x, lock.y, 10001);
+lock.sprite = Sprite(lock.image.Scale(lock.width, lock.height));
 lock.sprite.SetOpacity(0);
 
 # Bullet array
 bullet.sprites = [];
 
+fun position_bullet(index) {
+  bullet.sprites[index].SetPosition(entry.x + 20 + index * (7 + 5), entry.y + entry.image.GetHeight() / 2 - 3.5, 10002);
+}
+
 fun display_normal_callback() {
   hide_password_dialog();
 
@@ -165,11 +170,8 @@ fun display_password_callback(prompt, bullets) {
   for (index = 0; index < bullets_to_show; index++) {
     if (!bullet.sprites[index]) {
       # Scale bullet image to 7x7 pixels
-      scaled_bullet = bullet.image.Scale(7, 7);
-      bullet.sprites[index] = Sprite(scaled_bullet);
-      bullet.x = entry.x + 20 + index * (7 + 5);
-      bullet.y = entry.y + entry.image.GetHeight() / 2 - 3.5;
-      bullet.sprites[index].SetPosition(bullet.x, bullet.y, 10002);
+      bullet.sprites[index] = Sprite(bullet.image.Scale(7, 7));
+      position_bullet(index);
     }
 
     bullet.sprites[index].SetOpacity(1);
@@ -183,19 +185,11 @@ Plymouth.SetDisplayPasswordFunction(display_password_callback);
 
 progress_box.image = Image("progress_box.png");
 progress_box.sprite = Sprite(progress_box.image);
-
-progress_box.x = Window.GetWidth() / 2 - progress_box.image.GetWidth() / 2;
-progress_box.y = entry.y + entry.image.GetHeight() / 2 - progress_box.image.GetHeight() / 2;
-progress_box.sprite.SetPosition(progress_box.x, progress_box.y, 0);
 progress_box.sprite.SetOpacity(0);
 
 progress_bar.original_image = Image("progress_bar.png");
 progress_bar.sprite = Sprite();
 progress_bar.image = progress_bar.original_image.Scale(1, progress_bar.original_image.GetHeight());
-
-progress_bar.x = Window.GetWidth() / 2 - progress_bar.original_image.GetWidth() / 2;
-progress_bar.y = progress_box.y + (progress_box.image.GetHeight() - progress_bar.original_image.GetHeight()) / 2;
-progress_bar.sprite.SetPosition(progress_bar.x, progress_bar.y, 1);
 progress_bar.sprite.SetOpacity(0);
 
 fun progress_callback(duration, progress) {
@@ -216,6 +210,39 @@ fun progress_callback(duration, progress) {
 
 Plymouth.SetBootProgressFunction(progress_callback);
 
+#----------------------------------------- Layout --------------------------------
+
+# Center the logo, dialogue and progress bar for the current window size
+fun layout() {
+  global.layout_width = Window.GetWidth();
+  global.layout_height = Window.GetHeight();
+
+  logo.sprite.SetX(global.layout_width / 2 - logo.image.GetWidth() / 2);
+  logo.sprite.SetY(global.layout_height / 2 - logo.image.GetHeight() / 2);
+
+  entry.x = global.layout_width / 2 - entry.image.GetWidth() / 2;
+  entry.y = logo.sprite.GetY() + logo.image.GetHeight() + 40;
+  entry.sprite.SetPosition(entry.x, entry.y, 10001);
+
+  lock.x = entry.x - lock.width - 15;
+  lock.y = entry.y + entry.image.GetHeight() / 2 - lock.height / 2;
+  lock.sprite.SetPosition(lock.x, lock.y, 10001);
+
+  for (index = 0; bullet.sprites[index]; index++) {
+    position_bullet(index);
+  }
+
+  progress_box.x = global.layout_width / 2 - progress_box.image.GetWidth() / 2;
+  progress_box.y = entry.y + entry.image.GetHeight() / 2 - progress_box.image.GetHeight() / 2;
+  progress_box.sprite.SetPosition(progress_box.x, progress_box.y, 0);
+
+  progress_bar.x = global.layout_width / 2 - progress_bar.original_image.GetWidth() / 2;
+  progress_bar.y = progress_box.y + (progress_box.image.GetHeight() - progress_bar.original_image.GetHeight()) / 2;
+  progress_bar.sprite.SetPosition(progress_bar.x, progress_bar.y, 1);
+}
+
+layout();
+
 #----------------------------------------- Message --------------------------------
 
 message_sprite = Sprite();