display: Round the displayed scale values logically

Mutter currently generates 4 scales per integer scale. Knowing that,
we can nicely "round" the values we display to what the ideal scales
are even though the real values might be skewed since mutter creates
scale values close to the ideal ones that yield integer logical sizes.

https://bugzilla.gnome.org/show_bug.cgi?id=786922

1 files changed, 8 insertions, 1 deletions

diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
index 277c39d94..32e5102de 100644
--- a/panels/display/cc-display-panel.c
+++ b/panels/display/cc-display-panel.c
@@ -1105,10 +1105,17 @@ scale_buttons_active (CcDisplayPanel *panel,
     }
 }
 
+static double
+round_scale_for_ui (double scale)
+{
+  /* Keep in sync with mutter */
+  return round (scale*4)/4;
+}
+
 static GtkWidget *
 make_label_for_scale (double scale)
 {
-  gchar *text = g_strdup_printf (" %d%% ", (int) round (scale*100));
+  gchar *text = g_strdup_printf (" %d %% ", (int) (round_scale_for_ui (scale)*100));
   GtkWidget *label = gtk_label_new (text);
   g_free (text);
   return label;