Roll HarfBuzz to 0.9.35

third_party/harfbuzz-ng/src/hb-common.h

 /*
  * Copyright © 2007,2008,2009  Red Hat, Inc.
  * Copyright © 2011,2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
@@ skipping 77 matching lines @@
 
 /* hb_tag_t */
 
 typedef uint32_t hb_tag_t;
 
 #define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint8_t)(c1))<<24)|(((uint8_t)(c2))<<16)|(((uint8_t)(c3))<<8)|((uint8_t)(c4))))
 #define HB_UNTAG(tag)   ((uint8_t)((tag)>>24)), ((uint8_t)((tag)>>16)), ((uint8_t)((tag)>>8)), ((uint8_t)(tag))
 
 #define HB_TAG_NONE HB_TAG(0,0,0,0)
 #define HB_TAG_MAX HB_TAG(0xff,0xff,0xff,0xff)
+#define HB_TAG_MAX_SIGNED HB_TAG(0x7f,0xff,0xff,0xff)
 
 /* len=-1 means str is NUL-terminated. */
 hb_tag_t
 hb_tag_from_string (const char *str, int len);
 
 /* buf should have 4 bytes. */
 void
 hb_tag_to_string (hb_tag_t tag, char *buf);
 
 
 /* hb_direction_t */
 
 typedef enum {
   HB_DIRECTION_INVALID = 0,
   HB_DIRECTION_LTR = 4,
   HB_DIRECTION_RTL,
   HB_DIRECTION_TTB,
   HB_DIRECTION_BTT
 } hb_direction_t;
 
 /* 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_VALID(dir)      ((((unsigned int) (dir)) & ~3U) == 4)
+/* Direction must be valid for the following */
 #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_IS_VALID(dir)      ((((unsigned int) (dir)) & ~3U) == 4)
-#define HB_DIRECTION_REVERSE(dir)       ((hb_direction_t) (((unsigned int) (dir)) ^ 1)) /* Direction must be valid */
+#define HB_DIRECTION_REVERSE(dir)       ((hb_direction_t) (((unsigned int) (dir)) ^ 1))
 
 
 /* hb_language_t */
 
 typedef const struct hb_language_impl_t *hb_language_t;
 
 /* len=-1 means str is NUL-terminated */
 hb_language_t
 hb_language_from_string (const char *str, int len);
 
@@ skipping 147 matching lines @@
   /*7.0*/ HB_SCRIPT_OLD_PERMIC                  = HB_TAG ('P','e','r','m'),
   /*7.0*/ HB_SCRIPT_PAHAWH_HMONG                = HB_TAG ('H','m','n','g'),
   /*7.0*/ HB_SCRIPT_PALMYRENE                   = HB_TAG ('P','a','l','m'),
   /*7.0*/ HB_SCRIPT_PAU_CIN_HAU                 = HB_TAG ('P','a','u','c'),
   /*7.0*/ HB_SCRIPT_PSALTER_PAHLAVI             = HB_TAG ('P','h','l','p'),
   /*7.0*/ HB_SCRIPT_SIDDHAM                     = HB_TAG ('S','i','d','d'),
   /*7.0*/ HB_SCRIPT_TIRHUTA                     = HB_TAG ('T','i','r','h'),
   /*7.0*/ HB_SCRIPT_WARANG_CITI                 = HB_TAG ('W','a','r','a'),
 
   /* No script set. */
-  /*---*/ HB_SCRIPT_INVALID                     = HB_TAG_NONE,
+  HB_SCRIPT_INVALID                             = HB_TAG_NONE,
 
-  /* Dummy value to ensure any hb_tag_t value can be passed/stored as hb_script_t
-   * without risking undefined behavior. */
-  /*---*/ _HB_SCRIPT_MAX_VALUE                  = HB_TAG_MAX
+  /* Dummy values to ensure any hb_tag_t value can be passed/stored as hb_script_t
+   * without risking undefined behavior.  Include both a signed and unsigned max,
+   * since technically enums are int, and indeed, hb_script_t ends up being signed.
+   * See this thread for technicalities:
+   *
+   *   http://lists.freedesktop.org/archives/harfbuzz/2014-March/004150.html
+   */
+  _HB_SCRIPT_MAX_VALUE                          = HB_TAG_MAX, /*< skip >*/
+  _HB_SCRIPT_MAX_VALUE_SIGNED                   = HB_TAG_MAX_SIGNED /*< skip >*/
 
 } hb_script_t;
 
 
 /* Script functions */
 
 hb_script_t
 hb_script_from_iso15924_tag (hb_tag_t tag);
 
-/* suger for tag_from_string() then script_from_iso15924_tag */
+/* sugar for tag_from_string() then script_from_iso15924_tag */
 /* len=-1 means s is NUL-terminated */
 hb_script_t
 hb_script_from_string (const char *s, int len);
 
 hb_tag_t
 hb_script_to_iso15924_tag (hb_script_t script);
 
 hb_direction_t
 hb_script_get_horizontal_direction (hb_script_t script);
 
 
 /* User data */
 
 typedef struct hb_user_data_key_t {
   /*< private >*/
   char unused;
 } hb_user_data_key_t;
 
 typedef void (*hb_destroy_func_t) (void *user_data);
 
 
 HB_END_DECLS
 
 #endif /* HB_COMMON_H */