/* harfbuzz-buffer-private.h: Buffer of glyphs for substitution/positioning
 *
 * Copyright 2004,7 Red Hat Software
 *
 * Portions Copyright 1996-2000 by
 * David Turner, Robert Wilhelm, and Werner Lemberg.
 *
 * This file is part of the FreeType project, and may only be used
 * modified and distributed under the terms of the FreeType project
 * license, LICENSE.TXT.  By continuing to use, modify, or distribute
 * this file you indicate that you have read the license and
 * understand and accept it fully.
 */
#ifndef HARFBUZZ_BUFFER_PRIVATE_H
#define HARFBUZZ_BUFFER_PRIVATE_H

#include "harfbuzz-impl.h"
#include "harfbuzz-buffer.h"

HB_BEGIN_HEADER

#define HB_GLYPH_PROPERTIES_UNKNOWN 0xFFFF

HB_INTERNAL void
_hb_buffer_swap( HB_Buffer buffer );

HB_INTERNAL void
_hb_buffer_clear_output( HB_Buffer buffer );

HB_INTERNAL HB_Error
_hb_buffer_clear_positions( HB_Buffer buffer );

HB_INTERNAL HB_Error
_hb_buffer_add_output_glyphs( HB_Buffer  buffer,
			      HB_UShort  num_in,
			      HB_UShort  num_out,
			      HB_UShort *glyph_data,
			      HB_UShort  component,
			      HB_UShort  ligID );

HB_INTERNAL HB_Error
_hb_buffer_add_output_glyph ( HB_Buffer buffer,
			      HB_UInt   glyph_index,
			      HB_UShort component,
			      HB_UShort ligID );

HB_INTERNAL HB_Error
_hb_buffer_copy_output_glyph ( HB_Buffer buffer );

HB_INTERNAL HB_Error
_hb_buffer_replace_output_glyph ( HB_Buffer buffer,
				  HB_UInt   glyph_index,
				  HB_Bool   inplace );

HB_INTERNAL HB_UShort
_hb_buffer_allocate_ligid( HB_Buffer buffer );


/* convenience macros */

#define IN_GLYPH( pos )        (buffer->in_string[(pos)].gindex)
#define IN_ITEM( pos )         (&buffer->in_string[(pos)])
#define IN_CURGLYPH()          (buffer->in_string[buffer->in_pos].gindex)
#define IN_CURITEM()           (&buffer->in_string[buffer->in_pos])
#define IN_PROPERTIES( pos )   (buffer->in_string[(pos)].properties)
#define IN_LIGID( pos )        (buffer->in_string[(pos)].ligID)
#define IN_COMPONENT( pos )    (buffer->in_string[(pos)].component)
#define POSITION( pos )        (&buffer->positions[(pos)])
#define OUT_GLYPH( pos )       (buffer->out_string[(pos)].gindex)
#define OUT_ITEM( pos )        (&buffer->out_string[(pos)])

#define CHECK_Property( gdef, index, flags, property )					\
          ( ( error = _HB_GDEF_Check_Property( (gdef), (index), (flags),		\
                                      (property) ) ) != HB_Err_Ok )

#define ADD_String( buffer, num_in, num_out, glyph_data, component, ligID )             \
          ( ( error = _hb_buffer_add_output_glyphs( (buffer),                            \
						    (num_in), (num_out),                \
                                                    (glyph_data), (component), (ligID)  \
                                                  ) ) != HB_Err_Ok )
#define ADD_Glyph( buffer, glyph_index, component, ligID )				\
          ( ( error = _hb_buffer_add_output_glyph( (buffer),                             \
                                                    (glyph_index), (component), (ligID) \
                                                  ) ) != HB_Err_Ok )
#define REPLACE_Glyph( buffer, glyph_index, nesting_level )				\
          ( ( error = _hb_buffer_replace_output_glyph( (buffer), (glyph_index),		\
						      (nesting_level) == 1 ) ) != HB_Err_Ok )
#define COPY_Glyph( buffer )								\
	  ( (error = _hb_buffer_copy_output_glyph ( buffer ) ) != HB_Err_Ok )

HB_END_HEADER

#endif /* HARFBUZZ_BUFFER_PRIVATE_H */
