Introduce and use FLOOR and CEIL macros in Pango units

This replaces the code that was trying to implement those via the ROUND
macro. This avoids a potential issue with values that already were on
whole units being rounded up to the next whole unit in the code that was
implementing CEIL this way.

1 files changed, 26 insertions, 0 deletions

diff --git a/pango/pango-types.h b/pango/pango-types.h
index f18225ba..ed86f699 100644
--- a/pango/pango-types.h
+++ b/pango/pango-types.h
@@ -107,6 +107,32 @@ typedef guint32 PangoGlyph;
  */
 
 /**
+ * PANGO_UNITS_FLOOR:
+ * @d: a dimension in Pango units.
+ *
+ * Rounds a dimension down to whole device units, but does not
+ * convert it to device units.
+ *
+ * Return value: rounded down dimension in Pango units.
+ * Since: 1.50
+ */
+#define PANGO_UNITS_FLOOR(d)                \
+  ((d) & ~(PANGO_SCALE - 1))
+
+/**
+ * PANGO_UNITS_CEIL:
+ * @d: a dimension in Pango units.
+ *
+ * Rounds a dimension up to whole device units, but does not
+ * convert it to device units.
+ *
+ * Return value: rounded up dimension in Pango units.
+ * Since: 1.50
+ */
+#define PANGO_UNITS_CEIL(d)                 \
+  (((d) + (PANGO_SCALE - 1)) & ~(PANGO_SCALE - 1))
+
+/**
  * PANGO_UNITS_ROUND:
  * @d: a dimension in Pango units.
  *