fix flickering when resizing/spawning windows

Fixes: https://github.com/djpohly/dwl/issues/306

1 files changed, 15 insertions, 0 deletions

diff --git a/client.h b/client.h
index c18d01a..4dc9e1a 100644
--- a/client.h
+++ b/client.h
@@ -198,6 +198,21 @@ client_is_mapped(Client *c)
 }
 
 static inline int
+client_is_rendered_on_mon(Client *c, Monitor *m)
+{
+	/* This is needed for when you don't want to check formal assignment,
+	 * but rather actual displaying of the pixels.
+	 * Usually VISIBLEON suffices and is also faster. */
+	struct wlr_surface_output *s;
+	if (!c->scene->node.enabled)
+		return 0;
+	wl_list_for_each(s, &client_surface(c)->current_outputs, link)
+		if (s->output == m->wlr_output)
+			return 1;
+	return 0;
+}
+
+static inline int
 client_is_unmanaged(Client *c)
 {
 #ifdef XWAYLAND