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| 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 | |
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