From: Po Lu <luangruo@yahoo.com>
Date: Wed, 2 Feb 2022 01:17:31 +0000 (+0800)
Subject: Don't use XRender to fill rectangles unless an alpha channel exists
X-Git-Tag: emacs-29.0.90~2589
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=f1f0608fd1316b4f9a0fde99293e0c9ee5ef7ea3;p=emacs.git

Don't use XRender to fill rectangles unless an alpha channel exists

* src/xterm.c (x_clear_area): Don't use XRender unless
`alpha_bits' is set.
---

diff --git a/src/xterm.c b/src/xterm.c
index 843483b594a..68488b3ef55 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -4769,7 +4769,8 @@ x_clear_area (struct frame *f, int x, int y, int width, int height)
 #if defined HAVE_XRENDER && \
   (RENDER_MAJOR > 0 || (RENDER_MINOR >= 2))
       x_xr_ensure_picture (f);
-      if (FRAME_X_PICTURE (f) != None
+      if (FRAME_DISPLAY_INFO (f)->alpha_bits
+	  && FRAME_X_PICTURE (f) != None
 	  && FRAME_CHECK_XR_VERSION (f, 0, 2))
 	{
 	  XRenderColor xc;