PangoOTTag

typedef guint32  PangoOTTag;

The PangoOTTag typedef is used to represent TrueType and OpenType four letter tags inside Pango. Use the FT_MAKE_TAG() macro defined in the FreeType2 header freetype/freetype.h to create PangoOTTags manually.

PangoOTInfo

typedef struct _PangoOTInfo PangoOTInfo;

The PangoOTInfo struct contains the various tables associated with an OpenType font. It contains only private fields and should only be accessed via the pango_ot_info_* functions which are documented below. To obtain a PangoOTInfo, use pango_ot_info_new().

PangoOTBuffer

typedef struct _PangoOTBuffer PangoOTBuffer;

PangoOTGlyph

typedef struct {
  guint    glyph;
  guint    properties;
  guint    cluster;
  gushort  component;
  gushort  ligID;
  gushort  property_cache;    /* Internal */
} PangoOTGlyph;

PangoOTRuleset

typedef struct _PangoOTRuleset PangoOTRuleset;

The PangoOTRuleSet structure holds a set of features selected from the tables in an OpenType font. (A feature is an operation such as adjusting glyph positioning that should be applied to a text feature such as a certain type of accent.) A PangoOTRuleSet is created with pango_ot_ruleset_new(), features are addded to it with pango_ot_ruleset_add_feature(), then it is applied to a PangoGlyphString with pango_ot_ruleset_shape().

enum PangoOTTableType

typedef enum 
{
  PANGO_OT_TABLE_GSUB,
  PANGO_OT_TABLE_GPOS
} PangoOTTableType;

The PangoOTTableType enumeration values are used to identify the various OpenType tables in the pango_ot_info_* functions.

pango_ot_info_get ()

PangoOTInfo* pango_ot_info_get              (FT_Face face);

Returns the PangoOTInfo structure for the given FreeType font.

Since 1.2

pango_ot_info_find_script ()

gboolean    pango_ot_info_find_script       (PangoOTInfo *info,
                                             PangoOTTableType table_type,
                                             PangoOTTag script_tag,
                                             guint *script_index);

Finds the index of a script.

pango_ot_info_find_language ()

gboolean    pango_ot_info_find_language     (PangoOTInfo *info,
                                             PangoOTTableType table_type,
                                             guint script_index,
                                             PangoOTTag language_tag,
                                             guint *language_index,
                                             guint *required_feature_index);

Finds the index of a language and its required feature index.

pango_ot_info_find_feature ()

gboolean    pango_ot_info_find_feature      (PangoOTInfo *info,
                                             PangoOTTableType table_type,
                                             PangoOTTag feature_tag,
                                             guint script_index,
                                             guint language_index,
                                             guint *feature_index);

Finds the index of a feature.

pango_ot_info_list_scripts ()

PangoOTTag* pango_ot_info_list_scripts      (PangoOTInfo *info,
                                             PangoOTTableType table_type);

Obtains the list of available scripts.

pango_ot_info_list_languages ()

PangoOTTag* pango_ot_info_list_languages    (PangoOTInfo *info,
                                             PangoOTTableType table_type,
                                             guint script_index,
                                             PangoOTTag language_tag);

Obtains the list of available languages for a given script.

pango_ot_info_list_features ()

PangoOTTag* pango_ot_info_list_features     (PangoOTInfo *info,
                                             PangoOTTableType table_type,
                                             PangoOTTag tag,
                                             guint script_index,
                                             guint language_index);

Obtains the list of features for the given language of the given script.

pango_ot_buffer_new ()

PangoOTBuffer* pango_ot_buffer_new          (PangoFcFont *font);

pango_ot_buffer_destroy ()

void        pango_ot_buffer_destroy         (PangoOTBuffer *buffer);

pango_ot_buffer_clear ()

void        pango_ot_buffer_clear           (PangoOTBuffer *buffer);

pango_ot_buffer_add_glyph ()

void        pango_ot_buffer_add_glyph       (PangoOTBuffer *buffer,
                                             guint glyph_index,
                                             guint properties,
                                             guint cluster);

pango_ot_buffer_set_rtl ()

void        pango_ot_buffer_set_rtl         (PangoOTBuffer *buffer,
                                             gboolean rtl);

pango_ot_buffer_set_zero_width_marks ()

void        pango_ot_buffer_set_zero_width_marks
                                            (PangoOTBuffer *buffer,
                                             gboolean zero_width_marks);

Sets whether characters with a mark class should be forced to zero width. This setting is needed for proper positioning of Arabic accents, but will produce incorrect results with standard OpenType indic fonts.

Since 1.6

pango_ot_buffer_get_glyphs ()

void        pango_ot_buffer_get_glyphs      (PangoOTBuffer *buffer,
                                             PangoOTGlyph **glyphs,
                                             int *n_glyphs);

pango_ot_buffer_output ()

void        pango_ot_buffer_output          (PangoOTBuffer *buffer,
                                             PangoGlyphString *glyphs);

pango_ot_ruleset_new ()

PangoOTRuleset* pango_ot_ruleset_new        (PangoOTInfo *info);

Creates a new PangoOTRuleset for the given OpenType info.

pango_ot_ruleset_add_feature ()

void        pango_ot_ruleset_add_feature    (PangoOTRuleset *ruleset,
                                             PangoOTTableType table_type,
                                             guint feature_index,
                                             gulong property_bit);

Adds a feature to the ruleset. See pango_ot_ruleset_shape() for an explanation of property_bit.

pango_ot_ruleset_substitute ()

void        pango_ot_ruleset_substitute     (PangoOTRuleset *ruleset,
                                             PangoOTBuffer *buffer);

pango_ot_ruleset_position ()

void        pango_ot_ruleset_position       (PangoOTRuleset *ruleset,
                                             PangoOTBuffer *buffer);