| reed@android.com | 5469607 | 2010-04-08 18:48:12 +0000 | [diff] [blame] | 1 | #ifndef SCRIPT_IDENTIFY_H_ |
| 2 | #define SCRIPT_IDENTIFY_H_ |
| 3 | |
| 4 | #include <stdint.h> |
| 5 | |
| 6 | #include <harfbuzz-shaper.h> |
| 7 | |
| 8 | static const uint32_t HB_InvalidCodePoint = 0xffffffffu; |
| 9 | |
| 10 | // ----------------------------------------------------------------------------- |
| 11 | // Return the next Unicode code point from a UTF-16 vector |
| 12 | // chars: a pointer to @len words |
| 13 | // iter: (input/output) an index into @chars. This is updated. |
| 14 | // returns: HB_InvalidCodePoint on error and the code point otherwise. |
| 15 | // ----------------------------------------------------------------------------- |
| 16 | uint32_t utf16_to_code_point(const uint16_t *chars, size_t len, ssize_t *iter); |
| 17 | |
| 18 | // ----------------------------------------------------------------------------- |
| 19 | // Like the above, except that the code points are traversed backwards. Thus, |
| 20 | // on the first call, |iter| should be |len| - 1. |
| 21 | // ----------------------------------------------------------------------------- |
| 22 | uint32_t utf16_to_code_point(const uint16_t *chars, size_t len, ssize_t *iter); |
| 23 | |
| 24 | // ----------------------------------------------------------------------------- |
| 25 | // Return the script of the given code point |
| 26 | // ----------------------------------------------------------------------------- |
| 27 | HB_Script code_point_to_script(uint32_t cp); |
| 28 | |
| 29 | // ----------------------------------------------------------------------------- |
| 30 | // Find the next script run in a UTF-16 string. |
| 31 | // |
| 32 | // A script run is a subvector of codepoints, all of which are in the same |
| 33 | // script. A run will never cut a surrogate pair in half at either end. |
| 34 | // |
| 35 | // num_code_points: (output, maybe NULL) the number of code points in the run |
| 36 | // output: (output) the @pos, @length and @script fields are set on success |
| 37 | // chars: the UTF-16 string |
| 38 | // len: the length of @chars, in words |
| 39 | // iter: (in/out) the current index into the string. This should be 0 for the |
| 40 | // first call and is updated on exit. |
| 41 | // |
| 42 | // returns: non-zero if a script run was found and returned. |
| 43 | // ----------------------------------------------------------------------------- |
| 44 | char hb_utf16_script_run_next(unsigned *num_code_points, HB_ScriptItem *output, |
| 45 | const uint16_t *chars, size_t len, ssize_t *iter); |
| 46 | |
| 47 | // ----------------------------------------------------------------------------- |
| 48 | // This is the same as above, except that the input is traversed backwards. |
| 49 | // Thus, on the first call, |iter| should be |len| - 1. |
| 50 | // ----------------------------------------------------------------------------- |
| 51 | char hb_utf16_script_run_prev(unsigned *num_code_points, HB_ScriptItem *output, |
| 52 | const uint16_t *chars, size_t len, ssize_t *iter); |
| 53 | |
| 54 | #endif |