globalhotkeys : use new xcb-util API (>= 0.3.4)

recent xcb_key_symbols_get_keycode() now returns a pointer

Keep old API (as present in Debian Lenny for example) as requested by nefrir
GetModifier() is broken when using the new API, it might be broken as
well when using the old API.

Documents / source code of functions used in GetModifier() are very
welcome, libxcb only ships XML descriptions and the generated source
code is very unreadable.

configure.ac

@@ -3644,7 +3644,11 @@ AS_IF([test "${enable_xcb}" != "no"], [
   ], [true])
 
   dnl xcb-utils
-  PKG_CHECK_MODULES(XCB_KEYSYMS, [xcb-keysyms])
+  PKG_CHECK_MODULES(XCB_KEYSYMS, [xcb-keysyms >= 0.3.4],
+    [true],
+    [PKG_CHECK_MODULES(XCB_KEYSYMS, [xcb-keysyms])
+    VLC_ADD_CFLAGS([globalhotkeys], [-DXCB_KEYSYM_OLD_API])]
+  )
 
   VLC_ADD_PLUGIN([xcb_window])
   VLC_ADD_PLUGIN([globalhotkeys])

modules/control/globalhotkeys/xcb.c

@@ -57,7 +57,11 @@ vlc_module_end()
 
 typedef struct
 {
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
     xcb_keycode_t i_x11;
+#else
+    xcb_keycode_t *p_keys;
+#endif
     unsigned      i_modifier;
     int           i_action;
 } hotkey_mapping_t;
@@ -126,6 +130,10 @@ static int Open( vlc_object_t *p_this )
     if( vlc_clone( &p_sys->thread, Thread, p_intf, VLC_THREAD_PRIORITY_LOW ) )
     {
         Unregister( p_intf );
+#ifndef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
+        if( p_sys->p_map )
+            free( p_sys->p_map->p_keys );
+#endif
         free( p_sys->p_map );
         goto error;
     }
@@ -152,6 +160,10 @@ static void Close( vlc_object_t *p_this )
     vlc_join( p_sys->thread, NULL );
 
     Unregister( p_intf );
+#ifndef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
+    if( p_sys->p_map )
+        free( p_sys->p_map->p_keys );
+#endif
     free( p_sys->p_map );
 
     xcb_key_symbols_free( p_sys->p_symbols );
@@ -170,9 +182,14 @@ static unsigned GetModifier( xcb_connection_t *p_connection, xcb_key_symbols_t *
         XCB_MOD_MASK_4, XCB_MOD_MASK_5
     };
 
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
     const xcb_keycode_t key = xcb_key_symbols_get_keycode( p_symbols, sym );
     if( key == 0 )
+#else
+    const xcb_keycode_t *p_keys = xcb_key_symbols_get_keycode( p_symbols, sym );
+    if( !p_keys )
         return 0;
+#endif
 
     xcb_get_modifier_mapping_cookie_t r =
             xcb_get_modifier_mapping( p_connection );
@@ -185,19 +202,28 @@ static unsigned GetModifier( xcb_connection_t *p_connection, xcb_key_symbols_t *
     if( !p_keycode )
         return 0;
 
-    unsigned i_mask = 0;
     for( int i = 0; i < 8; i++ )
-    {
         for( int j = 0; j < p_map->keycodes_per_modifier; j++ )
-        {
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
             if( p_keycode[i * p_map->keycodes_per_modifier + j] == key )
-                i_mask = pi_mask[i];
+            {
+                free( p_map );
+                return pi_mask[i];
             }
+#else
+            for( int k = 0; p_keys[k] != XCB_NO_SYMBOL; k++ )
+                if( p_keycode[i*p_map->keycodes_per_modifier + j] == p_keys[k])
+                {
+                    free( p_map );
+                    return pi_mask[i];
                 }
+#endif
 
     free( p_map ); // FIXME to check
-    return i_mask;
+    return 0;
 }
+
+
 static unsigned GetX11Modifier( xcb_connection_t *p_connection,
         xcb_key_symbols_t *p_symbols, unsigned i_vlc )
 {
@@ -295,16 +321,24 @@ static void Mapping( intf_thread_t *p_intf )
 
         const int i_vlc_action = p_hotkey->i_action;
         const int i_vlc_key = config_GetInt( p_intf, psz_hotkey );
-
         free( psz_hotkey );
 
         if( !i_vlc_key )
             continue;
-
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
         const xcb_keycode_t key = xcb_key_symbols_get_keycode(
                 p_sys->p_symbols, GetX11Key( i_vlc_key & ~KEY_MODIFIER ) );
+#else
+        xcb_keycode_t *p_keys = xcb_key_symbols_get_keycode(
+                p_sys->p_symbols, GetX11Key( i_vlc_key & ~KEY_MODIFIER ) );
+        printf("%s -> %x\n", p_hotkey->psz_action, i_vlc_key );
+        printf("got %p\n", p_keys );
+        if( !p_keys )
+            continue;
+#endif
         const unsigned i_modifier = GetX11Modifier( p_sys->p_connection,
                 p_sys->p_symbols, i_vlc_key & KEY_MODIFIER );
+        printf("modif = %d\n", i_modifier);
 
         const size_t max = sizeof(p_x11_modifier_ignored) /
                 sizeof(*p_x11_modifier_ignored);
@@ -325,7 +359,11 @@ static void Mapping( intf_thread_t *p_intf )
             }
             hotkey_mapping_t *p_map = &p_sys->p_map[p_sys->i_map++];
 
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
             p_map->i_x11 = key;
+#else
+            p_map->p_keys = p_keys;
+#endif
             p_map->i_modifier = i_modifier|i_ignored;
             p_map->i_action = i_vlc_action;
         }
@@ -339,9 +377,19 @@ static void Register( intf_thread_t *p_intf )
     for( int i = 0; i < p_sys->i_map; i++ )
     {
         const hotkey_mapping_t *p_map = &p_sys->p_map[i];
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
         xcb_grab_key( p_sys->p_connection, true, p_sys->root,
                       p_map->i_modifier, p_map->i_x11,
                       XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC );
+#else
+        for( int j = 0; p_map->p_keys[j] != XCB_NO_SYMBOL; j++ )
+        {
+            printf("grabbing %d (j=%d, map = %d)\n", p_map->p_keys[j], j, i);
+            xcb_grab_key( p_sys->p_connection, true, p_sys->root,
+                          p_map->i_modifier, p_map->p_keys[j],
+                          XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC );
+        }
+#endif
     }
 }
 static void Unregister( intf_thread_t *p_intf )
@@ -351,8 +399,14 @@ static void Unregister( intf_thread_t *p_intf )
     for( int i = 0; i < p_sys->i_map; i++ )
     {
         const hotkey_mapping_t *p_map = &p_sys->p_map[i];
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
         xcb_ungrab_key( p_sys->p_connection, p_map->i_x11, p_sys->root,
                 p_map->i_modifier );
+#else
+        for( int j = 0; p_map->p_keys[j] != XCB_NO_SYMBOL; j++ )
+            xcb_ungrab_key( p_sys->p_connection, p_map->p_keys[j], p_sys->root,
+                    p_map->i_modifier );
+#endif
     }
 }
 
@@ -398,6 +452,7 @@ static void *Thread( void *p_data )
             {
                 hotkey_mapping_t *p_map = &p_sys->p_map[i];
 
+#ifdef XCB_KEYSYM_OLD_API /* as seen in Debian Lenny */
                 if( p_map->i_x11 == e->detail &&
                     p_map->i_modifier == e->state )
                 {
@@ -405,6 +460,20 @@ static void *Thread( void *p_data )
                             p_map->i_action );
                     break;
                 }
+#else
+            bool loop_break = false;
+            for( int j = 0; p_map->p_keys[j] != XCB_NO_SYMBOL; j++ )
+                if( p_map->p_keys[j] == e->detail &&
+                    p_map->i_modifier == e->state )
+                {
+                    var_SetInteger( p_intf->p_libvlc, "key-action",
+                            p_map->i_action );
+                    loop_break = true;
+                    break;
+                }
+            if( loop_break )
+                break;
+#endif
             }
             free( p_event );
         }