153 lines
4.8 KiB
C
153 lines
4.8 KiB
C
/*
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* Copyright (C) 1998-2004 David Turner and Werner Lemberg
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* Copyright (C) 2004,2007,2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Owen Taylor, Behdad Esfahbod
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*/
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#ifndef HB_BUFFER_PRIVATE_H
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#define HB_BUFFER_PRIVATE_H
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#include "hb-private.h"
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#include "hb-buffer.h"
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#include "hb-unicode-private.h"
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HB_BEGIN_DECLS
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#define HB_BUFFER_GLYPH_PROPERTIES_UNKNOWN 0xFFFF
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typedef struct _hb_internal_glyph_info_t {
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hb_codepoint_t codepoint;
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hb_mask_t mask;
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uint32_t cluster;
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uint16_t component;
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uint16_t lig_id;
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uint32_t gproperty;
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} hb_internal_glyph_info_t;
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typedef struct _hb_internal_glyph_position_t {
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hb_position_t x_advance;
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hb_position_t y_advance;
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hb_position_t x_offset;
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hb_position_t y_offset;
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uint32_t back : 16; /* number of glyphs to go back
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for drawing current glyph */
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int32_t cursive_chain : 16; /* character to which this connects,
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may be positive or negative; used
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only internally */
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} hb_internal_glyph_position_t;
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ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_internal_glyph_info_t));
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ASSERT_STATIC (sizeof (hb_glyph_position_t) == sizeof (hb_internal_glyph_position_t));
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ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
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struct _hb_buffer_t {
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hb_reference_count_t ref_count;
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/* Information about how the text in the buffer should be treated */
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hb_unicode_funcs_t *unicode;
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hb_direction_t direction;
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hb_script_t script;
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hb_language_t language;
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/* Buffer contents */
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unsigned int allocated;
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hb_bool_t have_output; /* whether we have an output buffer going on */
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hb_bool_t have_positions; /* whether we have positions */
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unsigned int in_length;
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unsigned int out_length;
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unsigned int in_pos;
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unsigned int out_pos; /* out_length and out_pos are actually always the same */
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hb_internal_glyph_info_t *in_string;
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hb_internal_glyph_info_t *out_string;
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hb_internal_glyph_position_t *positions;
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/* Other stuff */
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unsigned int max_lig_id;
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};
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HB_INTERNAL void
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_hb_buffer_swap (hb_buffer_t *buffer);
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HB_INTERNAL void
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_hb_buffer_clear_output (hb_buffer_t *buffer);
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HB_INTERNAL void
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_hb_buffer_add_output_glyphs (hb_buffer_t *buffer,
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unsigned int num_in,
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unsigned int num_out,
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const hb_codepoint_t *glyph_data,
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unsigned short component,
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unsigned short ligID);
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HB_INTERNAL void
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_hb_buffer_add_output_glyphs_be16 (hb_buffer_t *buffer,
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unsigned int num_in,
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unsigned int num_out,
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const uint16_t *glyph_data_be,
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unsigned short component,
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unsigned short ligID);
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HB_INTERNAL void
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_hb_buffer_add_output_glyph (hb_buffer_t *buffer,
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hb_codepoint_t glyph_index,
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unsigned short component,
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unsigned short ligID);
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HB_INTERNAL void
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_hb_buffer_next_glyph (hb_buffer_t *buffer);
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HB_INTERNAL void
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_hb_buffer_replace_glyph (hb_buffer_t *buffer,
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hb_codepoint_t glyph_index);
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HB_INTERNAL unsigned short
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_hb_buffer_allocate_lig_id (hb_buffer_t *buffer);
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/* convenience macros */
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#define IN_GLYPH(pos) (buffer->in_string[(pos)].codepoint)
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#define IN_INFO(pos) (&buffer->in_string[(pos)])
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#define IN_CURGLYPH() (buffer->in_string[buffer->in_pos].codepoint)
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#define IN_NEXTGLYPH() (buffer->in_string[buffer->in_pos + 1].codepoint)
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#define IN_CURINFO() (&buffer->in_string[buffer->in_pos])
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#define IN_MASK(pos) (buffer->in_string[(pos)].mask)
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#define IN_CLUSTER(pos) (buffer->in_string[(pos)].cluster)
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#define IN_LIGID(pos) (buffer->in_string[(pos)].lig_id)
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#define IN_COMPONENT(pos) (buffer->in_string[(pos)].component)
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#define POSITION(pos) (&buffer->positions[(pos)])
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#define CURPOSITION() (&buffer->positions[buffer->in_pos])
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#define OUT_GLYPH(pos) (buffer->out_string[(pos)].codepoint)
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#define OUT_INFO(pos) (&buffer->out_string[(pos)])
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HB_END_DECLS
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#endif /* HB_BUFFER_PRIVATE_H */
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