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Pango Reference Manual | |
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PangoEngineLang;
PangoEngineLangClass;
#define PANGO_ENGINE_TYPE_LANG
#define PANGO_ENGINE_LANG_DEFINE_TYPE (name, prefix, class_init, instance_init)
The language engines are rendering-system independent engines that determine line, word, and character breaks for character strings. These engines are used in pango_break().
typedef struct _PangoEngineLang PangoEngineLang;
The PangoEngineLang class is implemented by engines that customize the rendering-system independent part of the Pango pipeline for a particular script or language. For instance, a custom PangoEngineLang could be provided for Thai to implement the dictionary-based word boundary lookups needed for that language.
typedef struct {
void (*script_break) (PangoEngineLang *engine,
const char *text,
int len,
PangoAnalysis *analysis,
PangoLogAttr *attrs,
int attrs_len);
} PangoEngineLangClass;
Class structure for PangoEngineLang
| script_break () | Provides a custom implementation of pango_break(). If NULL, pango_default_break() is used instead. If not NULL, for Pango versions before 1.16 (module interface version before 1.6.0), this was called instead of pango_default_break(), but in newer versions, pango_default_break() is always called and this is called after that to allow tailoring the breaking results. |
#define PANGO_ENGINE_TYPE_LANG "PangoEngineLang"
A string constant defining the engine type for language engines. These engines derive from PangoEngineLang.
#define PANGO_ENGINE_LANG_DEFINE_TYPE(name, prefix, class_init, instance_init)
Outputs the necessary code for GObject type registration for a PangoEngineLang class defined in a module. Two static symbols are defined.
static GType prefix_type; static void prefix_register_type (GTypeModule module);
The prefix, _register_type() function should be called in your script_engine_init() function for each type that your module implements, and then your script_engine_create() function can create instances of the object as follows:
PangoEngine *engine = g_object_new (prefix_type, NULL);