1 files changed, 14 insertions, 1 deletions
diff --git a/src/x.cc b/src/x.cc
index 53b09d4..3749f81 100644
--- a/src/x.cc
+++ b/src/x.cc
@@ -177,6 +177,7 @@ Format get_best_format(xcb_connection_t* conn, xcb_screen_t const* screen,
   xcb_render_pictforminfo_t* render = nullptr;
   xcb_render_pictforminfo_t* render_alpha = nullptr;
   xcb_render_query_pict_formats_reply_t* render_formats = nullptr;
+  uint8_t flags = 0;
   PixelFormat format;
 
   auto render_reply = xcb_get_extension_data(conn, &xcb_render_id);
@@ -265,6 +266,15 @@ Format get_best_format(xcb_connection_t* conn, xcb_screen_t const* screen,
     free(render_formats);
     return Format();
   }
+
+  if (depth != screen->root_depth) {
+    flags |= Format::FLAG_NEED_BORDER;
+  }
+  if (visual->visual_id != screen->root_visual
+      || screen->default_colormap == XCB_NONE) {
+    flags |= Format::FLAG_NEED_COLORMAP;
+  }
+
   if (render && render_formats) {
     auto info = xcb_render_query_pict_formats_formats(render_formats);
     auto count = xcb_render_query_pict_formats_formats_length(render_formats);
@@ -313,7 +323,10 @@ Format get_best_format(xcb_connection_t* conn, xcb_screen_t const* screen,
   // as xcb_render_pictforminfo_t pointers
   // free(render_formats);
 
-  return Format(depth, visual, render, render_alpha);
+  return Format(depth, visual, render, render_alpha, flags);
 }
 
+const uint8_t Format::FLAG_NEED_BORDER = 1 << 0;
+const uint8_t Format::FLAG_NEED_COLORMAP = 1 << 1;
+
 }  // namespace x