#!/usr/bin/mscgen -Tpng

msc {
	hscale="1.5";

	c [label = "compositor"], w [label = "libweston core"],
	b [label = "backend"];

	|||;

	--- [label = "Head is destroyed for an enabled output"];

	b box b [label = "A head disappears, e.g. MST connector is removed, not just disconnected"];

	w <= b [label = "weston_head_release()"];
	c x- w [label = "head->destroy_signal"];
	w => w [label = "weston_head_detach()"];
	w :> b [label = "weston_output::detach_head()"];
	w note w [label = "No heads left in the output."];
	w => w [label = "weston_output_disable()"];
	w :> b [label = "weston_output::disable()"];
	w >> b [label = "release return"];
	b box b [label = "free(head)"];

	--- [label = "The output is left disabled."];
}