From d0611ae014164f689984f7a5099b46c0d452e100 Mon Sep 17 00:00:00 2001
From: Brad Barnett <127794626+bdbarnett@users.noreply.github.com>
Date: Wed, 23 Sep 2026 16:09:36 -0500
Subject: [PATCH] dino, pixel_sim_demos: present the LED grid again

15f166ad dropped display_drv.show() from examples on the grounds that
appdev.App presents every display with needs_refresh. A PixelDisplay has
no needs_refresh, and under pixel_sim it isn't the App's display at all,
so nothing ever called SimPixelFramebuffer.display() and both cards
painted a black canvas in both galleries.

Fixes #135
---
 lib/examples/dino.py            | 2 ++
 lib/examples/pixel_sim_demos.py | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/lib/examples/dino.py b/lib/examples/dino.py
index 8ec9cec8..fc97720d 100644
--- a/lib/examples/dino.py
+++ b/lib/examples/dino.py
@@ -489,6 +489,8 @@ def draw(self):
                 self._draw_number(self.high_score, WIDTH - 24, score_color)
 
         display_drv.blit_rect(self.canvas.buffer, 0, 0, WIDTH, HEIGHT)
+        # A PixelDisplay has no needs_refresh, so appdev.App never presents it.
+        display_drv.show()
 
     def tick(self, _timer=None):
         app.poll()
diff --git a/lib/examples/pixel_sim_demos.py b/lib/examples/pixel_sim_demos.py
index 1d2781fb..89ae26df 100644
--- a/lib/examples/pixel_sim_demos.py
+++ b/lib/examples/pixel_sim_demos.py
@@ -94,6 +94,8 @@ def _randint(a, b):
 
 def _present(dest):
     display_drv.blit_rect(dest.buffer, 0, 0, GRID_W, GRID_H)
+    # A PixelDisplay has no needs_refresh, so appdev.App never presents it.
+    display_drv.show()
 
 
 # --- scroll -----------------------------------------------------------------