weston_xkb_info: Cache all modifier indices for X11

X11 has a set of eight modifiers which we want to represent.  Cache
their indices when we create a weston_xkb_info, so we can use this from
compositor-x11 to keep the state synchronised exactly between the host X
server and a nested Weston instance.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>

src/compositor.c

@@ -2380,12 +2380,19 @@ weston_xkb_info_new_keymap(struct weston_xkb_info *xkb_info)
 {
 	char *keymap_str;
 
+	xkb_info->shift_mod = xkb_map_mod_get_index(xkb_info->keymap,
+						    XKB_MOD_NAME_SHIFT);
+	xkb_info->caps_mod = xkb_map_mod_get_index(xkb_info->keymap,
+						   XKB_MOD_NAME_CAPS);
 	xkb_info->ctrl_mod = xkb_map_mod_get_index(xkb_info->keymap,
 						   XKB_MOD_NAME_CTRL);
 	xkb_info->alt_mod = xkb_map_mod_get_index(xkb_info->keymap,
 						  XKB_MOD_NAME_ALT);
+	xkb_info->mod2_mod = xkb_map_mod_get_index(xkb_info->keymap, "Mod2");
+	xkb_info->mod3_mod = xkb_map_mod_get_index(xkb_info->keymap, "Mod3");
 	xkb_info->super_mod = xkb_map_mod_get_index(xkb_info->keymap,
 						    XKB_MOD_NAME_LOGO);
+	xkb_info->mod5_mod = xkb_map_mod_get_index(xkb_info->keymap, "Mod5");
 
 	xkb_info->num_led = xkb_map_led_get_index(xkb_info->keymap,
 						  XKB_LED_NAME_NUM);

src/compositor.h

@@ -189,9 +189,14 @@ struct weston_xkb_info {
 	int keymap_fd;
 	size_t keymap_size;
 	char *keymap_area;
+	xkb_mod_index_t shift_mod;
+	xkb_mod_index_t caps_mod;
 	xkb_mod_index_t ctrl_mod;
 	xkb_mod_index_t alt_mod;
+	xkb_mod_index_t mod2_mod;
+	xkb_mod_index_t mod3_mod;
 	xkb_mod_index_t super_mod;
+	xkb_mod_index_t mod5_mod;
 	xkb_led_index_t num_led;
 	xkb_led_index_t caps_led;
 	xkb_led_index_t scroll_led;