Make HB_DIRECTION_INVALID be zero
This changes all the HB_DIRECTION_* enum member values, but is
nicer, in preparation for making hb_segment_properties_t public.
diff --git a/src/hb-common.h b/src/hb-common.h
index dd86334..5d9015d 100644
--- a/src/hb-common.h
+++ b/src/hb-common.h
@@ -93,31 +93,31 @@
#define HB_TAG_NONE HB_TAG(0,0,0,0)
-/* len=-1 means s is NUL-terminated */
-hb_tag_t hb_tag_from_string (const char *s, int len);
+/* len=-1 means str is NUL-terminated */
+hb_tag_t hb_tag_from_string (const char *str, int len);
/* hb_direction_t */
typedef enum _hb_direction_t {
- HB_DIRECTION_INVALID = -1,
- HB_DIRECTION_LTR = 0,
+ HB_DIRECTION_INVALID = 0,
+ HB_DIRECTION_LTR = 4,
HB_DIRECTION_RTL,
HB_DIRECTION_TTB,
HB_DIRECTION_BTT
} hb_direction_t;
-/* len=-1 means s is NUL-terminated */
+/* len=-1 means str is NUL-terminated */
hb_direction_t
hb_direction_from_string (const char *str, int len);
const char *
hb_direction_to_string (hb_direction_t direction);
-#define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 0)
-#define HB_DIRECTION_IS_VERTICAL(dir) ((((unsigned int) (dir)) & ~1U) == 2)
-#define HB_DIRECTION_IS_FORWARD(dir) ((((unsigned int) (dir)) & ~2U) == 0)
-#define HB_DIRECTION_IS_BACKWARD(dir) ((((unsigned int) (dir)) & ~2U) == 1)
+#define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 4)
+#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_REVERSE(dir) ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
@@ -125,7 +125,7 @@
typedef struct _hb_language_t *hb_language_t;
-/* len=-1 means s is NUL-terminated */
+/* len=-1 means str is NUL-terminated */
hb_language_t
hb_language_from_string (const char *str, int len);
