hb-private.hh: Add fallback implementation for round()
For pre-C99 compilers that do not support round(), we need to have a
simplistic implementation for it, when it is not detected during build
configuration, either via CMake or autotools, by using floor() and
ceil(), which are provided in the pre-C99 compilers.
Please see discussion at commit 86a0ac2 for more details for re-adding
this patch.
diff --git a/src/hb-private.hh b/src/hb-private.hh
index daa496e..62a103c 100644
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -1070,4 +1070,17 @@
};
+/* fallback for round() */
+#if !defined (HAVE_ROUND) && !defined (HAVE_DECL_ROUND)
+static inline double
+round (double x)
+{
+ if (x >= 0)
+ return floor (x + 0.5);
+ else
+ return ceil (x - 0.5);
+}
+#endif
+
+
#endif /* HB_PRIVATE_HH */
