Switch from libXcursor to libxcb-cursor

Thanks to Michael Stapelberg, there is now a xcb-only port of libXcursor which
does everything we need. This patch switches awesome over to that new library.

Since the only reason for using XOpenDisplay() instead of xcb_connect() was so
that we can use libXcursor, we can get back to that older state again. This
means that this effectively reverts the following commits:

531f8b415c "Added initial support for Xlib cursor themes"
77243cd09a "Add x11-xcb to the pkg-config checks"
779d43fc46 "Don't let Xlib own the event queue"
03759b4847 "Fix keyboard layouts"

Signed-off-by: Uli Schlachter <psychon@znc.in>

awesome.c

@@ -33,9 +33,6 @@
 #include <xcb/xtest.h>
 #include <xcb/shape.h>
 
-#include <X11/Xlib-xcb.h>
-#include <X11/XKBlib.h>
-
 #include <glib-unix.h>
 
 #include "awesome.h"
@@ -86,6 +83,7 @@ awesome_atexit(bool restart)
     xcb_aux_sync(globalconf.connection);
 
     /* Disconnect *after* closing lua */
+    xcb_cursor_context_free(globalconf.cursor_ctx);
     xcb_disconnect(globalconf.connection);
 }
 
@@ -377,21 +375,11 @@ main(int argc, char **argv)
     sigemptyset(&sa.sa_mask);
     sigaction(SIGSEGV, &sa, 0);
 
-    /* XLib sucks */
-    XkbIgnoreExtension(True);
-
-    /* X stuff */
-    globalconf.display = XOpenDisplay(NULL);
-    if (globalconf.display == NULL) {
-        fatal("cannot open display");
-    }
-    XSetEventQueueOwner(globalconf.display, XCBOwnsEventQueue);
-    globalconf.default_screen = XDefaultScreen(globalconf.display);
-    globalconf.connection = XGetXCBConnection(globalconf.display);
     /* We have no clue where the input focus is right now */
     globalconf.focus.need_update = true;
 
-    /* Double checking that connection is good and operatable with xcb */
+    /* X stuff */
+    globalconf.connection = xcb_connect(NULL, &globalconf.default_screen);
     if(xcb_connection_has_error(globalconf.connection))
         fatal("cannot open display");
 
@@ -419,6 +407,9 @@ main(int argc, char **argv)
     xcb_prefetch_extension_data(globalconf.connection, &xcb_xinerama_id);
     xcb_prefetch_extension_data(globalconf.connection, &xcb_shape_id);
 
+    if (xcb_cursor_context_new(globalconf.connection, globalconf.screen, &globalconf.cursor_ctx) < 0)
+        fatal("Failed to initialize xcb-cursor");
+
     /* Setup the main context */
     g_main_context_set_poll_func(g_main_context_default(), &a_glib_poll);
 

awesomeConfig.cmake

@@ -133,8 +133,7 @@ pkg_check_modules(AWESOME_REQUIRED REQUIRED
     gdk-pixbuf-2.0
     cairo
     x11
-    x11-xcb
-    xcursor
+    xcb-cursor
     xcb-randr
     xcb-xtest
     xcb-xinerama

common/xcursor.c

@@ -22,6 +22,8 @@
 #include "common/xcursor.h"
 #include "common/util.h"
 
+#include <X11/cursorfont.h>
+
 static char const * const xcursor_font[] =
 {
     [XC_X_cursor] = "X_cursor",
@@ -129,17 +131,17 @@ xcursor_font_tostr(uint16_t c)
 
 /** Equivalent to 'XCreateFontCursor()', error are handled by the
  * default current error handler.
- * \param conn The connection to the X server.
+ * \param ctx The xcb-cursor context.
  * \param cursor_font Type of cursor to use.
  * \return Allocated cursor font.
  */
 xcb_cursor_t
-xcursor_new(Display *conn, uint16_t cursor_font)
+xcursor_new(xcb_cursor_context_t *ctx, uint16_t cursor_font)
 {
     static xcb_cursor_t xcursor[countof(xcursor_font)];
 
     if (!xcursor[cursor_font]) {
-        xcursor[cursor_font] = XcursorLibraryLoadCursor(conn, xcursor_font_tostr(cursor_font));
+        xcursor[cursor_font] = xcb_cursor_load_cursor(ctx, xcursor_font_tostr(cursor_font));
     }
 
     return xcursor[cursor_font];

common/xcursor.h

@@ -22,14 +22,12 @@
 #ifndef AWESOME_COMMON_XCURSORS_H
 #define AWESOME_COMMON_XCURSORS_H
 
-#include <X11/cursorfont.h>
 #include <xcb/xcb.h>
-
-#include <X11/Xcursor/Xcursor.h>
+#include <xcb/xcb_cursor.h>
 
 uint16_t xcursor_font_fromstr(const char *);
 const char * xcursor_font_tostr(uint16_t);
-xcb_cursor_t xcursor_new(Display *, uint16_t);
+xcb_cursor_t xcursor_new(xcb_cursor_context_t *, uint16_t);
 
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80

globalconf.h

@@ -29,6 +29,7 @@
 
 #include <xcb/xcb_icccm.h>
 #include <xcb/xcb_keysyms.h>
+#include <xcb/xcb_cursor.h>
 
 #include "objects/key.h"
 #include "color.h"
@@ -64,12 +65,12 @@ ARRAY_TYPE(drawin_t *, drawin)
 /** Main configuration structure */
 typedef struct
 {
-    /** Xlib Display */
-    Display * display;
     /** Connection ref */
     xcb_connection_t *connection;
     /** Default screen number */
     int default_screen;
+    /** xcb-cursor context */
+    xcb_cursor_context_t *cursor_ctx;
     /** Keys symbol table */
     xcb_key_symbols_t *keysyms;
     /** Logical screens */

mousegrabber.c

@@ -94,7 +94,7 @@ luaA_mousegrabber_run(lua_State *L)
 
     if(cfont)
     {
-        xcb_cursor_t cursor = xcursor_new(globalconf.display, cfont);
+        xcb_cursor_t cursor = xcursor_new(globalconf.cursor_ctx, cfont);
 
         luaA_registerfct(L, 1, &globalconf.mousegrabber);
 

objects/drawin.c

@@ -142,7 +142,7 @@ drawin_init(drawin_t *w)
                           | XCB_EVENT_MASK_POINTER_MOTION | XCB_EVENT_MASK_EXPOSURE
                           | XCB_EVENT_MASK_PROPERTY_CHANGE,
                           globalconf.default_cmap,
-                          xcursor_new(globalconf.display, xcursor_font_fromstr(w->cursor))
+                          xcursor_new(globalconf.cursor_ctx, xcursor_font_fromstr(w->cursor))
                       });
 
     /* Set the right properties */
@@ -502,7 +502,7 @@ luaA_drawin_set_cursor(lua_State *L, drawin_t *drawin)
         uint16_t cursor_font = xcursor_font_fromstr(buf);
         if(cursor_font)
         {
-            xcb_cursor_t cursor = xcursor_new(globalconf.display, cursor_font);
+            xcb_cursor_t cursor = xcursor_new(globalconf.cursor_ctx, cursor_font);
             p_delete(&drawin->cursor);
             drawin->cursor = a_strdup(buf);
             xwindow_set_cursor(drawin->window, cursor);

root.c

@@ -303,7 +303,7 @@ luaA_root_cursor(lua_State *L)
 
     if(cursor_font)
     {
-        uint32_t change_win_vals[] = { xcursor_new(globalconf.display, cursor_font) };
+        uint32_t change_win_vals[] = { xcursor_new(globalconf.cursor_ctx, cursor_font) };
 
         xcb_change_window_attributes(globalconf.connection,
                                      globalconf.screen->root,