From 922b49bb7dfdffe14ecebef442561c88d5807e3e Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Sun, 2 Feb 2020 19:46:13 +0800
Subject: [PATCH] Error message when display has no alpha channel

---
 src/floating_shape.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/floating_shape.c b/src/floating_shape.c
index 2941d13..9da600d 100644
--- a/src/floating_shape.c
+++ b/src/floating_shape.c
@@ -91,7 +91,12 @@ float_shape_t *make_shape_from_pixbuf(GdkPixbuf *pixbuf)
 
    screen = gtk_widget_get_screen(s->window);
    visual = gdk_screen_get_rgba_visual(screen);
-   g_assert(visual);
+
+   if (visual == NULL) {
+      fprintf(stderr, "Error: display does not support alpha channel\n");
+      exit(1);
+   }
+
    gtk_widget_set_visual(s->window, visual);
 
    g_signal_connect(G_OBJECT(s->window), "draw",
-- 
2.39.2