[PATCH] Print Composite extension version for "-ext Composite"

[Alan Coopersmith]

The only other information I could see to query in the Composite 0.4
protocol spec is the Composite Overlay Window XID, but the request to
get that ID has the side effect of mapping the overlay window, and
xdpyinfo shouldn't have side effects like that.

Signed-off-by: Alan Coopersmith <alan.coopersmith at sun.com>
---
 Makefile.am  |    2 ++
 configure.ac |    6 ++++++
 xdpyinfo.c   |   24 ++++++++++++++++++++++++
 3 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index ee33b76..5f3bb9b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -30,6 +30,7 @@ AM_CFLAGS = \
 	$(DPY_XF86MISC_CFLAGS) \
 	$(DPY_XINPUT_CFLAGS) \
 	$(DPY_XRENDER_CFLAGS) \
+	$(DPY_XCOMPOSITE_CFLAGS) \
 	$(DPY_XINERAMA_CFLAGS) \
 	$(DPY_DMX_CFLAGS) \
 	$(DPY_XPRINT_CFLAGS) \
@@ -44,6 +45,7 @@ xdpyinfo_LDADD = \
 	$(DPY_XF86MISC_LIBS) \
 	$(DPY_XINPUT_LIBS) \
 	$(DPY_XRENDER_LIBS) \
+	$(DPY_XCOMPOSITE_LIBS) \
 	$(DPY_XINERAMA_LIBS) \
 	$(DPY_DMX_LIBS) \
 	$(DPY_XPRINT_LIBS) \
diff --git a/configure.ac b/configure.ac
index c787a02..2b8bb5c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -99,6 +99,12 @@ PKG_CHECK_MODULES(DPY_XRENDER, xrender,
 	AC_CHECK_HEADERS([X11/extensions/Xrender.h],,,[#include <X11/Xlib.h>])
 	CPPFLAGS="$SAVE_CPPFLAGS"],[echo "not found"])
 
+PKG_CHECK_MODULES(DPY_XCOMPOSITE, xcomposite,
+	[SAVE_CPPFLAGS="$CPPFLAGS"
+	CPPFLAGS="$CPPFLAGS $DPY_XCOMPOSITE_CFLAGS $DPY_X11_CFLAGS"
+	AC_CHECK_HEADERS([X11/extensions/Xcomposite.h],,,[#include <X11/Xlib.h>])
+	CPPFLAGS="$SAVE_CPPFLAGS"],[echo "not found"])
+
 AC_ARG_WITH(xinerama, AC_HELP_STRING([--without-xinerama],[Disable xinerama support.]),
 		[USE_XINERAMA="$withval"], [USE_XINERAMA="yes"])
 if test "x$USE_XINERAMA" != "xno" ; then
diff --git a/xdpyinfo.c b/xdpyinfo.c
index 014e2bb..ede6465 100644
--- a/xdpyinfo.c
+++ b/xdpyinfo.c
@@ -66,6 +66,10 @@ in this Software without prior written authorization from The Open Group.
 #  define XRENDER
 # endif
 
+# if HAVE_X11_EXTENSIONS_XCOMPOSITE_H
+#  define COMPOSITE
+# endif
+
 # if HAVE_X11_EXTENSIONS_XINERAMA_H
 #  define PANORAMIX
 # endif
@@ -116,6 +120,9 @@ in this Software without prior written authorization from The Open Group.
 #ifdef XRENDER
 #include <X11/extensions/Xrender.h>
 #endif
+#ifdef COMPOSITE
+#include <X11/extensions/Xcomposite.h>
+#endif
 #ifdef PANORAMIX
 #include <X11/extensions/Xinerama.h>
 #endif
@@ -1166,6 +1173,20 @@ print_xrender_info(Display *dpy, char *extname)
 }
 #endif /* XRENDER */
 
+#ifdef COMPOSITE
+static int
+print_composite_info(Display *dpy, char *extname)
+{
+    int majorrev, minorrev, foo;
+
+    if (!XCompositeQueryExtension(dpy, &foo, &foo))
+	return 0;
+    if (!XCompositeQueryVersion(dpy, &majorrev, &minorrev))
+	return 0;
+    print_standard_extension_info(dpy, extname, majorrev, minorrev);
+    return 1;
+}
+#endif
 
 #ifdef PANORAMIX
 
@@ -1443,6 +1464,9 @@ static ExtensionPrintInfo known_extensions[] =
 #ifdef XRENDER
     {RENDER_NAME, print_xrender_info, False},
 #endif
+#ifdef COMPOSITE
+    {COMPOSITE_NAME, print_composite_info, False},
+#endif
 #ifdef PANORAMIX
     {"XINERAMA", print_xinerama_info, False},
 #endif
-- 
1.5.6.5