diff -r 50de0f36973f -r 5a4b72489111 ui/gtk/draw_cairo.h
--- a/ui/gtk/draw_cairo.h	Tue Oct 14 10:41:21 2025 +0200
+++ b/ui/gtk/draw_cairo.h	Tue Oct 14 12:48:55 2025 +0200
@@ -41,7 +41,7 @@
     cairo_t    *cr;
 } UiCairoGraphics;
 
-// ui_canvas_expose
+void ui_drawingarea_draw(UiDrawingArea *drawingarea, cairo_t *cr, int width, int height);
 
 #ifdef	__cplusplus
 }