+static xcb_visualtype_t *
+get_xcb_visualtype_for_depth(struct dri2_egl_display *dri2_dpy, int depth)
+{
+ xcb_visualtype_iterator_t visual_iter;
+ xcb_screen_t *screen = dri2_dpy->screen;
+ xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(screen);
+
+ for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
+ if (depth_iter.data->depth != depth)
+ continue;
+
+ visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
+ if (visual_iter.rem)
+ return visual_iter.data;
+ }
+
+ return NULL;
+}
+
+/* Get red channel mask for given depth. */
+unsigned int
+dri2_x11_get_red_mask_for_depth(struct dri2_egl_display *dri2_dpy, int depth)
+{
+ xcb_visualtype_t *visual = get_xcb_visualtype_for_depth(dri2_dpy, depth);
+
+ if (visual)
+ return visual->red_mask;
+
+ return 0;
+}