PangoOT – 1.0

The PangoOTRuleset structure holds a set of features selected from the tables in an OpenType font.

The PangoOTFeatureMap typedef is used to represent an OpenType feature with the property bit associated with it. The feature tag is represented as a char array instead of a PangoOTTag for convenience.

The PangoOTGlyph structure represents a single glyph together with information used for OpenType layout processing of the glyph. It contains the following fields.

The PangoOTRuleset structure holds all the information needed to build a complete PangoOTRuleset from an OpenType font. The main use of this struct is to act as the key for a per-font hash of rulesets. The user populates a ruleset description and gets the ruleset using pango_ot_ruleset_get_for_description() or create a new one using pango_ot_ruleset_new_from_description().

The PangoOTTag typedef is used to represent TrueType and OpenType four letter tags inside Pango. Use PANGO_OT_TAG_MAKE() or PANGO_OT_TAG_MAKE_FROM_STRING() macros to create PangoOTTags manually.

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

Finds the OpenType language-system tag best describing language.

Finds the OpenType script tag corresponding to script.

Finds a PangoLanguage corresponding to language_tag.

Finds the PangoScript corresponding to script_tag.

Creates a PangoOTTag from four characters. This is similar and compatible with the FT_MAKE_TAG() macro from FreeType.

Creates a PangoOTTag from a string. The string should be at least four characters long (pad with space characters if needed), and need not be nul-terminated. This is a convenience wrapper around PANGO_OT_TAG_MAKE(), but cannot be used in certain situations, for example, as a switch expression, as it dereferences pointers.

This is used as the property bit in pango_ot_ruleset_add_feature() when a feature should be applied to all glyphs.

This is used as the language index in pango_ot_info_find_feature() when the default language system of the script is desired.

This is used as a feature index that represent no feature, that is, should be skipped. It may be returned as feature index by pango_ot_info_find_feature() if the feature is not found, and pango_ot_ruleset_add_feature() function automatically skips this value, so no special handling is required by the user.

This is used as a script index that represent no script, that is, when the requested script was not found, and a default (‘DFLT’) script was not found either. It may be returned as script index by pango_ot_info_find_script() if the script or a default script are not found, all other functions taking a script index essentially return if the input script index is this value, so no special handling is required by the user.