libsysprof-gtk: add css loading helper

src/libsysprof-gtk/sysprof-css.c

@@ -0,0 +1,38 @@
+/* sysprof-css.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-css-private.h"
+
+void
+_sysprof_css_init (void)
+{
+  static GtkCssProvider *css;
+
+  if (css == NULL)
+    {
+      css = gtk_css_provider_new ();
+      gtk_css_provider_load_from_resource (css, "/libsysprof-gtk/style.css");
+      gtk_style_context_add_provider_for_display (gdk_display_get_default (),
+                                                  GTK_STYLE_PROVIDER (css),
+                                                  G_MAXUINT);
+    }
+}