[gnome-control-center/wip/hadess/logo-inherit: 1/2] info-overview: Look for -text and -dark logo variants

[Bastien Nocera <hadess src gnome org>]

commit f3e64d8735c02aee663dec255f72699f278690e6
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Apr 23 12:30:15 2021 +0200

    info-overview: Look for -text and -dark logo variants
    
    When loading the LOGO icon name from /etc/os-release, append -text to
    prefer a textual variant of the logo if it exists, and -dark if the
    theme variant is dark.
    
    This allows distributors to ship textual and dark variants of their
    logos without adding more fields to /etc/os-release, or more code
    specific to logo handling for specific distributions.
    
    $LOGO: default icon
    $LOGO-dark: default icon when dark theme is used
    $LOGO-text: icon with text
    $LOGO-text-dark: icon with text when dark theme is used

 panels/info-overview/cc-info-overview-panel.c  | 23 ++++++++++++++++++++++-
 panels/info-overview/cc-info-overview-panel.ui |  1 +
 2 files changed, 23 insertions(+), 1 deletion(-)
---
diff --git a/panels/info-overview/cc-info-overview-panel.c b/panels/info-overview/cc-info-overview-panel.c
index a2cb70755..a215b254a 100644
--- a/panels/info-overview/cc-info-overview-panel.c
+++ b/panels/info-overview/cc-info-overview-panel.c
@@ -862,13 +862,34 @@ cc_info_panel_row_activated_cb (CcInfoOverviewPanel *self,
     open_software_update (self);
 }
 
+static const char *
+get_asset_suffix (CcInfoOverviewPanel *panel)
+{
+  GdkScreen *screen;
+  GtkSettings *settings;
+  g_autofree char *theme_name = NULL;
+
+  theme_name = g_strdup (g_getenv ("GTK_THEME"));
+  if (theme_name != NULL)
+    return g_str_has_suffix (theme_name, "dark") ? "-dark" : "";
+
+  screen = gtk_widget_get_screen (GTK_WIDGET (panel));
+  settings = gtk_settings_get_for_screen (screen);
+
+  g_object_get (settings, "gtk-theme-name", &theme_name, NULL);
+  return (theme_name != NULL && g_str_has_suffix (theme_name, "dark")) ? "-dark" : "";
+}
+
 static void
 setup_os_logo (CcInfoOverviewPanel *panel)
 {
   g_autofree char *logo_name = g_get_os_info ("LOGO");
   if (logo_name != NULL)
     {
-      gtk_image_set_from_icon_name (panel->os_logo, logo_name, GTK_ICON_SIZE_INVALID);
+      g_autofree char *logo_name_with_variant = NULL;
+
+      logo_name_with_variant = g_strdup_printf ("%s-text%s", logo_name, get_asset_suffix (panel));
+      gtk_image_set_from_icon_name (panel->os_logo, logo_name_with_variant, GTK_ICON_SIZE_INVALID);
       gtk_image_set_pixel_size (panel->os_logo, 256);
     }
   else
diff --git a/panels/info-overview/cc-info-overview-panel.ui b/panels/info-overview/cc-info-overview-panel.ui
index 2f5d3cf8b..451aa09ee 100644
--- a/panels/info-overview/cc-info-overview-panel.ui
+++ b/panels/info-overview/cc-info-overview-panel.ui
@@ -28,6 +28,7 @@
                   <object class="GtkImage" id="os_logo">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
+                    <property name="use_fallback">True</property>
                   </object>
                   <packing>
                     <property name="expand">False</property>