Add HB_DIRECTION_IS_VALID

diff --git a/src/hb-common.h b/src/hb-common.h
index 26c056b..eefe984 100644 (file)
--- a/src/hb-common.h
+++ b/src/hb-common.h
@@ -118,6 +118,7 @@ hb_direction_to_string (hb_direction_t direction);
 #define HB_DIRECTION_IS_VERTICAL(dir)  ((((unsigned int) (dir)) & ~1U) == 6)
 #define HB_DIRECTION_IS_FORWARD(dir)   ((((unsigned int) (dir)) & ~2U) == 4)
 #define HB_DIRECTION_IS_BACKWARD(dir)  ((((unsigned int) (dir)) & ~2U) == 5)
+#define HB_DIRECTION_IS_VALID(dir)     ((((unsigned int) (dir)) & ~3U) == 4)
 #define HB_DIRECTION_REVERSE(dir)      ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
 
 

diff --git a/test/api/test-common.c b/test/api/test-common.c
index 7441d09..74b50be 100644 (file)
--- a/test/api/test-common.c
+++ b/test/api/test-common.c
@@ -78,6 +78,13 @@ test_types_direction (void)
   g_assert (HB_DIRECTION_IS_BACKWARD (HB_DIRECTION_BTT));
   g_assert (!HB_DIRECTION_IS_BACKWARD (HB_DIRECTION_INVALID));
 
+  g_assert (HB_DIRECTION_IS_VALID (HB_DIRECTION_LTR));
+  g_assert (HB_DIRECTION_IS_VALID (HB_DIRECTION_TTB));
+  g_assert (HB_DIRECTION_IS_VALID (HB_DIRECTION_RTL));
+  g_assert (HB_DIRECTION_IS_VALID (HB_DIRECTION_BTT));
+  g_assert (!HB_DIRECTION_IS_VALID (HB_DIRECTION_INVALID));
+  g_assert (!HB_DIRECTION_IS_VALID ((hb_direction_t) 0x12345678));
+
   g_assert_cmpint (HB_DIRECTION_REVERSE (HB_DIRECTION_LTR), ==, HB_DIRECTION_RTL);
   g_assert_cmpint (HB_DIRECTION_REVERSE (HB_DIRECTION_RTL), ==, HB_DIRECTION_LTR);
   g_assert_cmpint (HB_DIRECTION_REVERSE (HB_DIRECTION_TTB), ==, HB_DIRECTION_BTT);