query Xinerama screen information if HAVE_XINERAMA

2002-04-17  Havoc Pennington  <hp@pobox.com>

	* src/screen.c (meta_screen_new): query Xinerama screen
	information if HAVE_XINERAMA

	* configure.in (found_xinerama): check for Xinerama

ChangeLog

@@ -1,3 +1,10 @@
+2002-04-17  Havoc Pennington  <hp@pobox.com>
+
+	* src/screen.c (meta_screen_new): query Xinerama screen
+	information if HAVE_XINERAMA
+
+	* configure.in (found_xinerama): check for Xinerama
+
 2002-04-17  Changwoo Ryu  <cwryu@debian.org>
 
 	* configure.in (ALL_LINGUAS): Added ko (Korean).

acconfig.h

@@ -10,3 +10,4 @@
 #undef HAVE_SHAPE_EXT
 #undef HAVE_XFT
 #undef HAVE_SM
+#undef HAVE_XINERAMA

configure.in

@@ -93,7 +93,18 @@ AC_PATH_XTRA
 
 CFLAGS="$METACITY_CFLAGS $CFLAGS $X_CFLAGS"
 
-METACITY_LIBS="$X_LIBS $X_PRE_LIBS -lX11 $X_EXTRA_LIBS $METACITY_LIBS"
+XINERAMA_LIBS=
+found_xinerama=false
+AC_CHECK_LIB(Xext, XineramaQueryExtension,
+               [AC_CHECK_HEADERS(X11/extensions/Xinerama.h,
+                                 XINERAMA_LIBS=-lXinerama found_xinerama=true)],
+               , -lXinerama $X_LIBS $X_PRE_LIBS -lX11 $X_EXTRA_LIBS)
+
+if test "$found_xinerama" = "true"; then
+   AC_DEFINE(HAVE_XINERAMA)
+fi
+
+METACITY_LIBS="$XINERAMA_LIBS $X_LIBS $X_PRE_LIBS -lX11 $X_EXTRA_LIBS $METACITY_LIBS"
 
 found_sm=false
 case "$METACITY_LIBS" in

src/screen.c

@@ -30,6 +30,10 @@
 #include "keybindings.h"
 #include "stack.h"
 
+#ifdef HAVE_XINERAMA
+#include <X11/extensions/Xinerama.h>
+#endif
+
 #include <X11/Xatom.h>
 #include <locale.h>
 #include <string.h>
@@ -211,6 +215,75 @@ meta_screen_new (MetaDisplay *display,
   screen->default_xvisual = DefaultVisualOfScreen (screen->xscreen);
   screen->default_depth = DefaultDepthOfScreen (screen->xscreen);
 
+  screen->xinerama_infos = NULL;
+  screen->n_xinerama_infos = 0;
+
+#ifdef HAVE_XINERAMA
+  if (XineramaQueryExtension (display->xdisplay, NULL, NULL))
+    {
+      XineramaScreenInfo *infos;
+      int n_infos;
+      int i;
+      
+      n_infos = 0;
+      infos = XineramaQueryScreens (display->xdisplay, &n_infos);
+
+      meta_topic (META_DEBUG_XINERAMA,
+                  "Found %d Xinerama screens on display %s\n",
+                  n_infos, display->name);
+
+      if (n_infos > 0)
+        {
+          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, n_infos);
+          screen->n_xinerama_infos = n_infos;
+          
+          i = 0;
+          while (i < n_infos)
+            {
+              screen->xinerama_infos[i].number = infos[i].screen_number;
+              screen->xinerama_infos[i].x_origin = infos[i].x_org;
+              screen->xinerama_infos[i].y_origin = infos[i].y_org;
+              screen->xinerama_infos[i].width = infos[i].width;
+              screen->xinerama_infos[i].height = infos[i].height;
+              
+              ++i;
+            }
+        }
+      
+      meta_XFree (infos);
+    }
+  else
+    {
+      meta_topic (META_DEBUG_XINERAMA,
+                  "No Xinerama extension on display %s\n",
+                  display->name);
+    }
+#else
+  meta_topic (META_DEBUG_XINERAMA,
+              "Metacity compiled without Xinerama support\n");
+#endif
+
+  /* If no Xinerama, fill in the single screen info so
+   * we can use the field unconditionally
+   */
+  if (screen->n_xinerama_infos == 0)
+    {
+      meta_topic (META_DEBUG_XINERAMA,
+                  "No Xinerama screens, using default screen info\n");
+      
+      screen->xinerama_infos = g_new (MetaXineramaScreenInfo, 1);
+      screen->n_xinerama_infos = 1;
+      
+      screen->xinerama_infos[0].number = 0;
+      screen->xinerama_infos[0].x_origin = 0;
+      screen->xinerama_infos[0].y_origin = 0;
+      screen->xinerama_infos[0].width = screen->width;
+      screen->xinerama_infos[0].height = screen->height;
+    }
+
+  g_assert (screen->n_xinerama_infos > 0);
+  g_assert (screen->xinerama_infos != NULL);
+  
   meta_screen_set_cursor (screen, META_CURSOR_DEFAULT);
   
   if (display->leader_window == None)

src/screen.h

@@ -26,6 +26,17 @@
 #include <X11/Xutil.h>
 #include "ui.h"
 
+typedef struct _MetaXineramaScreenInfo MetaXineramaScreenInfo;
+
+struct _MetaXineramaScreenInfo
+{
+  int number;
+  int x_origin;
+  int y_origin;
+  int width;
+  int height;
+};
+
 typedef void (* MetaScreenWindowFunc) (MetaScreen *screen, MetaWindow *window,
                                        gpointer user_data);
 
@@ -48,6 +59,9 @@ struct _MetaScreen
   MetaStack *stack;
 
   MetaCursor current_cursor;
+
+  MetaXineramaScreenInfo *xinerama_infos;
+  int n_xinerama_infos;
 };
 
 MetaScreen*   meta_screen_new                 (MetaDisplay                *display,

src/util.c

@@ -190,6 +190,8 @@ topic_name (MetaDebugTopic topic)
       return "GEOMETRY";
     case META_DEBUG_PING:
       return "PING";
+    case META_DEBUG_XINERAMA:
+      return "XINERAMA";
     }
 
   return "Window manager";

src/util.h

@@ -55,7 +55,8 @@ typedef enum
   META_DEBUG_WINDOW_OPS   = 1 << 7,
   META_DEBUG_GEOMETRY     = 1 << 8,
   META_DEBUG_PLACEMENT    = 1 << 9,
-  META_DEBUG_PING         = 1 << 10
+  META_DEBUG_PING         = 1 << 10,
+  META_DEBUG_XINERAMA     = 1 << 11
 
 } MetaDebugTopic;