X11: Add Xdbe support to message boxes (thanks, Melker!).

Without this, message boxes with a lot of text will noticibly flicker as
you mouse over buttons.

Fixes Bugzilla #2343.

1 files changed, 27 insertions, 0 deletions

diff --git a/configure b/configure
index 3049e0c2fb..23142da8a2 100755
--- a/configure
+++ b/configure
@@ -826,6 +826,7 @@ enable_video_x11
 with_x
 enable_x11_shared
 enable_video_x11_xcursor
+enable_video_x11_xdbe
 enable_video_x11_xinerama
 enable_video_x11_xinput
 enable_video_x11_xrandr
@@ -1551,6 +1552,7 @@ Optional Features:
   --enable-x11-shared     dynamically load X11 support [[default=maybe]]
   --enable-video-x11-xcursor
                           enable X11 Xcursor support [[default=yes]]
+  --enable-video-x11-xdbe enable X11 Xdbe support [[default=yes]]
   --enable-video-x11-xinerama
                           enable X11 Xinerama support [[default=yes]]
   --enable-video-x11-xinput
@@ -20123,6 +20125,31 @@ $as_echo "#define SDL_VIDEO_DRIVER_X11_XCURSOR 1" >>confdefs.h
 
                 SUMMARY_video_x11="${SUMMARY_video_x11} xcursor"
             fi
+            # Check whether --enable-video-x11-xdbe was given.
+if test "${enable_video_x11_xdbe+set}" = set; then :
+  enableval=$enable_video_x11_xdbe;
+else
+  enable_video_x11_xdbe=yes
+fi
+
+            if test x$enable_video_x11_xdbe = xyes; then
+                ac_fn_c_check_header_compile "$LINENO" "X11/extensions/Xdbe.h" "ac_cv_header_X11_extensions_Xdbe_h" "#include <X11/Xlib.h>
+
+"
+if test "x$ac_cv_header_X11_extensions_Xdbe_h" = xyes; then :
+  have_dbe_h_hdr=yes
+else
+  have_dbe_h_hdr=no
+fi
+
+
+                if test x$have_dbe_h_hdr = xyes; then
+
+$as_echo "#define SDL_VIDEO_DRIVER_X11_XDBE 1" >>confdefs.h
+
+                    SUMMARY_video_x11="${SUMMARY_video_x11} xdbe"
+                fi
+            fi
             # Check whether --enable-video-x11-xinerama was given.
 if test "${enable_video_x11_xinerama+set}" = set; then :
   enableval=$enable_video_x11_xinerama;