Function PropagateChildLivery

src/group_cmd.cpp:302–322

* Propagate a livery change to a group's children, and optionally update cached vehicle colourmaps. * @param g Group to propagate colours to children. * @param reset_cache Reset colourmap of vehicles in this group. */

 * @param reset_cache Reset colourmap of vehicles in this group.
 */
static void PropagateChildLivery(const Group *g, bool reset_cache)
{
	if (reset_cache) {
		/* Company colour data is indirectly cached. */
		for (Vehicle *v : Vehicle::Iterate()) {
			if (v->group_id == g->index && (!v->IsGroundVehicle() || v->IsFrontEngine())) {
				for (Vehicle *u = v; u != nullptr; u = u->Next()) {
					u->colourmap = PAL_NONE;
					u->InvalidateNewGRFCache();
				}
			}
		}
	}

	for (const GroupID &childgroup : g->children) {
		Group *cg = Group::Get(childgroup);
		if (!cg->livery.in_use.Test(Livery::Flag::Primary)) cg->livery.colour1 = g->livery.colour1;
		if (!cg->livery.in_use.Test(Livery::Flag::Secondary)) cg->livery.colour2 = g->livery.colour2;
		PropagateChildLivery(cg, reset_cache);
	}
}

/**
 * Update group liveries for a company. This is called when the LS_DEFAULT scheme is changed, to update groups with