Remove the single-stage units converters

The stage-with/height-percentage converters had been broken by
the multiple-stages support of Clutter 0.8. They are also made
useless by the fact that Units are now floating point values.

The millimeters and typographic points converters also depended
on the default stage, but they can be reworked to use the default
DPI coming from the default Backend instead.

clutter/clutter-units.c

@@ -101,6 +101,58 @@
 #include "clutter-units.h"
 #include "clutter-private.h"
 
+#define DPI_FALLBACK    96.0
+
+/**
+ * clutter_units_mm:
+ * @mm: millimeters to convert
+ *
+ * Converts a value in millimeters to #ClutterUnit<!-- -->s at
+ * the current DPI.
+ *
+ * Return value: the value in units
+ *
+ * Since: 1.0
+ */
+ClutterUnit
+clutter_units_mm (gdouble mm)
+{
+  ClutterBackend *backend;
+  gdouble dpi;
+
+  backend = clutter_get_default_backend ();
+  dpi = clutter_backend_get_resolution (backend);
+  if (dpi < 0)
+    dpi = DPI_FALLBACK;
+
+  return mm * dpi / 25.4;
+}
+
+/**
+ * clutter_units_pt:
+ * @pt: typographic points to convert
+ *
+ * Converts a value in typographic points to #ClutterUnit<!-- -->s
+ * at the current DPI.
+ *
+ * Return value: the value in units
+ *
+ * Since: 1.0
+ */
+ClutterUnit
+clutter_units_pt (gdouble pt)
+{
+  ClutterBackend *backend;
+  gdouble dpi;
+
+  backend = clutter_get_default_backend ();
+  dpi = clutter_backend_get_resolution (backend);
+  if (dpi < 0)
+    dpi = DPI_FALLBACK;
+
+  return pt * dpi / 72.0;
+}
+
 static GTypeInfo _info = {
  0,
  NULL,