update-on-event

app/src/scrcpy.c

@@ -88,6 +88,7 @@ static SDL_bool event_loop(void) {
                 switch (event.window.event) {
                     case SDL_WINDOWEVENT_EXPOSED:
                     case SDL_WINDOWEVENT_SIZE_CHANGED:
+                        screen_update_scale(&screen);
                         screen_render(&screen);
                         break;
                 }

app/src/screen.c

@@ -313,3 +313,7 @@ void screen_resize_to_pixel_perfect(struct screen *screen) {
         LOGD("Resized to pixel-perfect");
     }
 }
+
+void screen_update_scale(struct screen *screen) {
+    render_set_scaled_logical_size(screen, screen->frame_size);
+}

app/src/screen.h

@@ -66,4 +66,8 @@ void screen_resize_to_fit(struct screen *screen);
 // resize window to 1:1 (pixel-perfect)
 void screen_resize_to_pixel_perfect(struct screen *screen);
 
+// recompute the scale in case the window moved from/to another screen with a
+// different HiDPI
+void screen_update_scale(struct screen *screen);
+
 #endif