File: pangofc-decoder.h

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/* Pango
 * pangofc-decoder.h: Custom encoders/decoders on a per-font basis.
 *
 * Copyright (C) 2004 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_DECODER_H_
#define __PANGO_DECODER_H_

#include <pango/pangofc-font.h>

G_BEGIN_DECLS

#define PANGO_TYPE_FC_DECODER       (pango_fc_decoder_get_type())
#define PANGO_FC_DECODER(object)    (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_FC_DECODER, PangoFcDecoder))
#define PANGO_IS_FC_DECODER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_FC_DECODER))

typedef struct _PangoFcDecoder      PangoFcDecoder;
typedef struct _PangoFcDecoderClass PangoFcDecoderClass;

#define PANGO_FC_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FC_DECODER, PangoFcDecoderClass))
#define PANGO_IS_FC_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_FC_DECODER))
#define PANGO_FC_DECODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_FC_DECODER, PangoFcDecoderClass))

/**
 * PangoFcDecoder:
 *
 * #PangoFcDecoder is a virtual base class that implementations will
 * inherit from.  It's the interface that is used to define a custom
 * encoding for a font.  These objects are created in your code from a
 * function callback that was originally registered with
 * pango_fc_font_map_add_decoder_find_func().  Pango requires
 * information about the supported charset for a font as well as the
 * individual character to glyph conversions.  Pango gets that
 * information via the #get_charset and #get_glyph callbacks into your
 * object implementation.
 *
 * Since: 1.6
 **/
struct _PangoFcDecoder
{
  /*< private >*/
  GObject parent_instance;
};

/**
 * PangoFcDecoderClass:
 * @get_charset: This returns an #FcCharset given a #PangoFcFont that
 *  includes a list of supported characters in the font.  The
 *  #FcCharSet that is returned should be an internal reference to your
 *  code.  Pango will not free this structure.  It is important that
 *  you make this callback fast because this callback is called
 *  separately for each character to determine Unicode coverage.
 * @get_glyph: This returns a single #PangoGlyph for a given Unicode
 *  code point.
 *
 * Class structure for #PangoFcDecoder.
 *
 * Since: 1.6
 **/
struct _PangoFcDecoderClass
{
  /*< private >*/
  GObjectClass parent_class;

  /* vtable - not signals */
  /*< public >*/
  FcCharSet  *(*get_charset) (PangoFcDecoder *decoder,
			      PangoFcFont    *fcfont);
  PangoGlyph  (*get_glyph)   (PangoFcDecoder *decoder,
			      PangoFcFont    *fcfont,
			      guint32         wc);

  /*< private >*/

  /* Padding for future expansion */
  void (*_pango_reserved1) (void);
  void (*_pango_reserved2) (void);
  void (*_pango_reserved3) (void);
  void (*_pango_reserved4) (void);
};

PANGO_AVAILABLE_IN_1_6
GType      pango_fc_decoder_get_type    (void) G_GNUC_CONST;

PANGO_AVAILABLE_IN_1_6
FcCharSet *pango_fc_decoder_get_charset (PangoFcDecoder *decoder,
					 PangoFcFont    *fcfont);

PANGO_AVAILABLE_IN_1_6
PangoGlyph pango_fc_decoder_get_glyph   (PangoFcDecoder *decoder,
					 PangoFcFont    *fcfont,
					 guint32         wc);

G_END_DECLS

#endif /* __PANGO_DECODER_H_ */