state_machine: paint placeholder before wake — no more stale-frame flash

On wake, display_wake() turned the backlight on first and then the
local_screens_show_loading / show_info call repainted the framebuffer.
For a few ms the user saw the previous /frame's contents (the last
camera snapshot from the prior wake cycle) before the new screen
landed. Swap the order: paint the placeholder first, then turn the
backlight on.

1 files changed, 4 insertions, 2 deletions

diff --git a/main/state_machine.c b/main/state_machine.c
index 0a6d491..c2b43c8 100644
--- a/main/state_machine.c
+++ b/main/state_machine.c
@@ -55,12 +55,14 @@ esp_err_t state_machine_set(viewport_run_state_t target)
 
     if (target == VIEWPORT_STATE_AWAKE) {
         if (display_is_up()) {
-            display_wake();
-            // Content choice: a configured device shows "Loading…" until
+            // Paint the placeholder BEFORE turning the backlight on so the
+            // user never glimpses the stale /frame contents from the
+            // previous wake cycle. Configured devices show "Loading…" until
             // Scrypted pushes a /frame; a device with no scrypted URL
             // shows the info screen since there's no Scrypted to push.
             if (configured) local_screens_show_loading();
             else            local_screens_show_info();
+            display_wake();
         }
         arm_idle_timer(idle_ms);
         ESP_LOGI(TAG, "AWAKE (%s)", configured ? "configured" : "no scrypted URL");