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/*
* Copyright (C) 1998-2004 David Turner and Werner Lemberg
* Copyright (C) 2004,2007,2009 Red Hat, Inc.
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Owen Taylor, Behdad Esfahbod
*/
#ifndef HB_BUFFER_H
#define HB_BUFFER_H
#include "hb-common.h"
HB_BEGIN_DECLS
typedef struct _hb_buffer_t hb_buffer_t;
typedef enum _hb_direction_t {
HB_DIRECTION_LTR,
HB_DIRECTION_RTL,
HB_DIRECTION_TTB,
HB_DIRECTION_BTT
} hb_direction_t;
typedef struct _hb_glyph_info_t {
hb_codepoint_t codepoint;
uint32_t properties;
uint32_t cluster;
uint16_t component;
uint16_t lig_id;
uint32_t internal;
} hb_glyph_info_t;
typedef struct _hb_glyph_position_t {
hb_position_t x_pos;
hb_position_t y_pos;
hb_position_t x_advance;
hb_position_t y_advance;
/* XXX these should all be replaced by "uint32_t internal" */
hb_bool_t new_advance :1; /* if set, the advance width values are
absolute, i.e., they won't be
added to the original glyph's value
but rather replace them */
unsigned short back : 15; /* number of glyphs to go back
for drawing current glyph */
short cursive_chain : 16; /* character to which this connects,
may be positive or negative; used
only internally */
} hb_glyph_position_t;
hb_buffer_t *
hb_buffer_create (unsigned int pre_alloc_size);
hb_buffer_t *
hb_buffer_reference (hb_buffer_t *buffer);
unsigned int
hb_buffer_get_reference_count (hb_buffer_t *buffer);
void
hb_buffer_destroy (hb_buffer_t *buffer);
void
hb_buffer_set_direction (hb_buffer_t *buffer,
hb_direction_t direction);
hb_direction_t
hb_buffer_get_direction (hb_buffer_t *buffer);
void
hb_buffer_clear (hb_buffer_t *buffer);
void
hb_buffer_clear_positions (hb_buffer_t *buffer);
void
hb_buffer_ensure (hb_buffer_t *buffer,
unsigned int size);
void
hb_buffer_add_glyph (hb_buffer_t *buffer,
hb_codepoint_t codepoint,
unsigned int properties,
unsigned int cluster);
/* Return value valid as long as buffer not modified */
unsigned int
hb_buffer_get_len (hb_buffer_t *buffer);
/* Return value valid as long as buffer not modified */
hb_glyph_info_t *
hb_buffer_get_glyph_infos (hb_buffer_t *buffer);
/* Return value valid as long as buffer not modified */
hb_glyph_position_t *
hb_buffer_get_glyph_positions (hb_buffer_t *buffer);
HB_END_DECLS
#endif /* HB_BUFFER_H */
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