| Pango Reference Manual |
|---|
Indic Engine Support — Indic support for legacy shaper engines.
#define PANGO_ZERO_WIDTH_NON_JOINER #define PANGO_ZERO_WIDTH_JOINER struct PangoIndicScript; void pango_indic_shift_vowels (PangoIndicScript *script, gunichar *chars, gunichar *end); void pango_indic_compact (PangoIndicScript *script, int *num, gunichar *chars, int *cluster); void pango_indic_convert_vowels (PangoIndicScript *script, gboolean in_middle, int *num, gunichar *chars, gboolean has_standalone_vowels); void pango_indic_split_out_characters (PangoIndicScript *script, const gchar *text, int n_chars, gunichar **wc, int *n_glyph, PangoGlyphString *glyphs);
The pango_indic_* functiosn are used to implement indic shaping support for certain legacy shaping engines, in particular the shaping engines for bitmap X fonts. These are basically internal routines and should not be used by applications.
#define PANGO_ZERO_WIDTH_NON_JOINER 0x200c
The Unicode character 'ZERO WIDTH NON-JOINER', 0x200c.
#define PANGO_ZERO_WIDTH_JOINER 0x200d
The Unicode character 'ZERO WIDTH JOINER', 0x200d.
struct PangoIndicScript {
/* Compulsory */
gchar *name;
/* Compulsory */
gboolean (*is_prefixing_vowel) (gunichar what);
/* Compulsory */
gboolean (*is_vowel_sign) (gunichar what);
/* Optional */
gunichar (*vowel_sign_to_matra) (gunichar what);
/* Optional */
gboolean (*is_vowel_half) (gunichar what);
/* Optional */
gboolean (*vowel_split) (gunichar what,
gunichar *prefix,
gunichar *suffix);
};
void pango_indic_shift_vowels (PangoIndicScript *script, gunichar *chars, gunichar *end);
This causes the any vowels in chars which are left-joining vowels to move to the start of chars.
It determines whether the vowels are left-joining by calling is_prefixing_vowel from script.
| script : | A PangoIndicScript |
| chars : | Array of gunichar |
| end : | Pointer to just after the end of chars |
void pango_indic_compact (PangoIndicScript *script, int *num, gunichar *chars, int *cluster);
This eliminates any blank space in the chars array, updated clusters and num also. (Blank space is defines as U+0000)
| script : | A PangoIndicScript |
| num : | The number of glyphs |
| chars : | An array of glyphs/characters |
| cluster : | The cluster array. |
void pango_indic_convert_vowels (PangoIndicScript *script, gboolean in_middle, int *num, gunichar *chars, gboolean has_standalone_vowels);
This converts the second two vowel signs in a row in a string, to either a vowel letter or spacing forms of the combining vowel.
| script : | A PangoIndicScript |
| in_middle : | Whether vowels should be converted |
| num : | The number of elements in chars. |
| chars : | An array of glyphs/characters |
| has_standalone_vowels : | Whether the font has standalone vowels. |
void pango_indic_split_out_characters
(PangoIndicScript *script,
const gchar *text,
int n_chars,
gunichar **wc,
int *n_glyph,
PangoGlyphString *glyphs);This splits out the string text into characters. It will split out two-part vowels using script->vowel_split if this function is available.
*n_chars is allocated with g_new, you must free it.
| script : | A PangoIndicScript |
| text : | A UTF-8 string |
| n_chars : | The number of UTF-8 sequences in text |
| wc : | Pointer to array of gunichar (output param) |
| n_glyph : | Pointer to number of elements in wc. (output param) |
| glyphs : | A PangoGlyphString. |
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