/**
* pango_ot_ruleset_maybe_add_feature:
* @ruleset: a #PangoOTRuleset.
* @table_type: the table type to add a feature to.
* @feature_tag: the tag of the feature to add.
* @property_bit: the property bit to use for this feature. Used to identify
* the glyphs that this feature should be applied to, or
* %PANGO_OT_ALL_GLYPHS if it should be applied to all glyphs.
*
* This is a convenience function that first tries to find the feature
* using pango_ot_info_find_feature() and the ruleset script and language
* passed to pango_ot_ruleset_new_for(),
* and if the feature is found, adds it to the ruleset.
*
* If @ruleset was not created using pango_ot_ruleset_new_for(), this function
* does nothing.
*
* Return value: %TRUE if the feature was found and added to ruleset,
* %FALSE otherwise.
*
* Since: 1.18
**/
gboolean
pango_ot_ruleset_maybe_add_feature (PangoOTRuleset *ruleset,
PangoOTTableType table_type,
PangoOTTag feature_tag,
gulong property_bit)
{
guint feature_index;
g_return_val_if_fail (PANGO_IS_OT_RULESET (ruleset), FALSE);
g_return_val_if_fail (ruleset->info != NULL, FALSE);
pango_ot_info_find_feature (ruleset->info, table_type,
feature_tag,
ruleset->script_index[table_type],
ruleset->language_index[table_type],
&feature_index);
if (feature_index != PANGO_OT_NO_FEATURE)
{
pango_ot_ruleset_add_feature (ruleset, table_type,
feature_index, property_bit);
return TRUE;
}
return FALSE;
}
static void
maybe_add_GPOS_feature (PangoOTRuleset *ruleset,
PangoOTInfo *info,
guint script_index,
PangoOTTag tag,
gulong property_bit)
{
guint feature_index;
/* 0xffff == default language system */
if (pango_ot_info_find_feature (info, PANGO_OT_TABLE_GPOS,
tag, script_index, 0xffff, &feature_index))
pango_ot_ruleset_add_feature (ruleset, PANGO_OT_TABLE_GPOS, feature_index,
property_bit);
}
static void
maybe_add_GPOS_feature (PangoOTRuleset *ruleset,
PangoOTInfo *info,
guint script_index,
PangoOTTag feature_tag,
gulong property_bit)
{
guint feature_index;
if (pango_ot_info_find_feature (info, PANGO_OT_TABLE_GPOS,
feature_tag,script_index, 0xffff, &feature_index))
{
/*
printf("Added GPOS feature '%c%c%c%c' = %8.8X\n", feature_tag>>24, feature_tag>>16&0xFF, feature_tag>>8&0xFF, feature_tag&0xFF, property_bit);
*/
pango_ot_ruleset_add_feature (ruleset, PANGO_OT_TABLE_GPOS, feature_index,
property_bit);
}
}
