From: Po Lu <luangruo@yahoo.com>
Date: Sat, 12 Feb 2022 01:20:53 +0000 (+0800)
Subject: Never set opaque region without an alpha channel
X-Git-Tag: emacs-29.0.90~2370
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=f622034fa565a50f9c210301aba2545b2521f356;p=emacs.git

Never set opaque region without an alpha channel

* src/xfns.c (x_set_alpha_background): Don't modify opaque
region if the visual has no alpha channel.
---

diff --git a/src/xfns.c b/src/xfns.c
index 849fa72f39f..6226f4063ac 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -746,6 +746,9 @@ x_set_alpha_background (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 				  f->alpha_background != 1.0);
 #endif
 
+  if (!FRAME_DISPLAY_INFO (f)->alpha_bits)
+    return;
+
   if (f->alpha_background != 1.0)
     {
       XChangeProperty (FRAME_X_DISPLAY (f),