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/* Pango
* pango-ot.h:
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __PANGO_OT_H__
#define __PANGO_OT_H__
#include <freetype/freetype.h>
#include <pango/pango-glyph.h>
G_BEGIN_DECLS
#ifdef PANGO_ENABLE_ENGINE
typedef guint32 PangoOTTag;
typedef struct _PangoOTInfo PangoOTInfo;
typedef struct _PangoOTRuleset PangoOTRuleset;
typedef enum
{
PANGO_OT_TABLE_GSUB,
PANGO_OT_TABLE_GPOS
} PangoOTTableType;
PangoOTInfo *pango_ot_info_new (FT_Face face);
gboolean pango_ot_info_find_script (PangoOTInfo *info,
PangoOTTableType table_type,
PangoOTTag script_tag,
guint *script_index);
gboolean pango_ot_info_find_language (PangoOTInfo *info,
PangoOTTableType table_type,
guint script_index,
PangoOTTag language_tag,
guint *language_index,
guint *required_feature_index);
gboolean pango_ot_info_find_feature (PangoOTInfo *info,
PangoOTTableType table_type,
PangoOTTag feature_tag,
guint script_index,
guint language_index,
guint *feature_index);
PangoOTTag *pango_ot_info_list_scripts (PangoOTInfo *info,
PangoOTTableType table_type);
PangoOTTag *pango_ot_info_list_languages (PangoOTInfo *info,
PangoOTTableType table_type,
guint script_index,
PangoOTTag language_tag);
PangoOTTag *pango_ot_info_list_features (PangoOTInfo *info,
PangoOTTableType table_type,
PangoOTTag tag,
guint script_index,
guint language_index);
/* A pointer to a function which loads a glyph. Its parameters are
* the same as in a call to TT_Load_Glyph() -- if no glyph loading
* function will be registered with pango_ot_set_glyph_loader(),
* TT_Load_Glyph() will be called indeed. The purpose of this function
* pointer is to provide a hook for caching glyph outlines and sbits
* (using the instance's generic pointer to hold the data).
*
* If for some reason no outline data is available (e.g. for an
* embedded bitmap glyph), _glyph->outline.n_points should be set to
* zero. _glyph can be computed with
*
* _glyph = HANDLE_Glyph( glyph )
*/
typedef FT_Error (*PangoOTGlyphLoader) (FT_Face face,
FT_UInt glyphIndex,
FT_Int loadFlags,
gpointer data);
/* A pointer to a function which selects the alternate glyph. `pos' is
* the position of the glyph with index `glyphID', `num_alternates'
* gives the number of alternates in the `alternates' array. `data'
* points to the user-defined structure specified during a call to
* TT_GSUB_Register_Alternate_Function(). The function must return an
* index into the `alternates' array.
*/
typedef FT_UShort (*PangoOTAlternateFunc) (FT_ULong pos,
FT_UShort glyphID,
FT_UShort num_alternates,
FT_UShort* alternates,
gpointer data);
PangoOTRuleset *pango_ot_ruleset_new (PangoOTInfo *info);
void pango_ot_ruleset_set_glyph_loader (PangoOTRuleset *ruleset,
PangoOTGlyphLoader func,
gpointer data,
GDestroyNotify notify);
void pango_ot_ruleset_set_alternate_func (PangoOTRuleset *ruleset,
PangoOTAlternateFunc func,
gpointer data,
GDestroyNotify notify);
void pango_ot_ruleset_add_feature (PangoOTRuleset *ruleset,
PangoOTTableType table_type,
guint feature_index,
gulong property_bit);
void pango_ot_ruleset_shape (PangoOTRuleset *ruleset,
PangoGlyphString *glyphs,
gulong *properties);
#endif /* PANGO_ENABLE_ENGINE */
G_END_DECLS
#endif /* __PANGO_OT_H__ */
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