From 73042bfc54ded75d3a4894bbbcece0d6e30a1e07 Mon Sep 17 00:00:00 2001
From: Alexander Larsson <alexl@redhat.com>
Date: Thu, 29 Aug 2019 16:19:33 +0200
Subject: [PATCH] GtkWidget: Precompile template xml on class creation

Ideally we will precompile during build and store the result in the
resource, but if that doesn't happen at least we will only parse
the xml once.
---
 gtk/gtkwidget.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index f1111277ba..18dde07f4c 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -12227,12 +12227,32 @@ void
 gtk_widget_class_set_template (GtkWidgetClass    *widget_class,
 			       GBytes            *template_bytes)
 {
+  GBytes *data = NULL;
+
   g_return_if_fail (GTK_IS_WIDGET_CLASS (widget_class));
   g_return_if_fail (widget_class->priv->template == NULL);
   g_return_if_fail (template_bytes != NULL);
 
   widget_class->priv->template = g_slice_new0 (GtkWidgetTemplate);
-  widget_class->priv->template->data = g_bytes_ref (template_bytes);
+
+  if (!_gtk_buildable_parser_is_precompiled (g_bytes_get_data (template_bytes, NULL), g_bytes_get_size (template_bytes)))
+    {
+      GError *error = NULL;
+
+      data = _gtk_buildable_parser_precompile (g_bytes_get_data (template_bytes, NULL),
+                                               g_bytes_get_size (template_bytes),
+                                               &error);
+      if (data == NULL)
+        {
+          g_warning ("Failed to precompile template for class %s: %s", G_OBJECT_CLASS_NAME (widget_class), error->message);
+          g_error_free (error);
+        }
+    }
+
+  if (data)
+    widget_class->priv->template->data = data;
+  else
+    widget_class->priv->template->data = g_bytes_ref (template_bytes);
 }
 
 /**
-- 
2.30.2