2 * Copyright © 1998-2004 David Turner and Werner Lemberg
3 * Copyright © 2004,2007,2009,2010 Red Hat, Inc.
4 * Copyright © 2011 Google, Inc.
6 * This is part of HarfBuzz, a text shaping library.
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 * Red Hat Author(s): Owen Taylor, Behdad Esfahbod
27 * Google Author(s): Behdad Esfahbod
30 #ifndef HB_BUFFER_PRIVATE_HH
31 #define HB_BUFFER_PRIVATE_HH
33 #include "hb-private.hh"
34 #include "hb-buffer.h"
35 #include "hb-object-private.hh"
36 #include "hb-unicode-private.hh"
40 ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
41 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
43 typedef struct _hb_segment_properties_t {
44 hb_direction_t direction;
46 hb_language_t language;
48 } hb_segment_properties_t;
52 hb_object_header_t header;
55 /* Information about how the text in the buffer should be treated */
57 hb_unicode_funcs_t *unicode; /* Unicode functions */
58 hb_segment_properties_t props; /* Script, language, direction */
62 bool in_error; /* Allocation failed */
63 bool have_output; /* Whether we have an output buffer going on */
64 bool have_positions; /* Whether we have positions */
66 unsigned int idx; /* Cursor into ->info and ->pos arrays */
67 unsigned int len; /* Length of ->info and ->pos arrays */
68 unsigned int out_len; /* Length of ->out array if have_output */
70 unsigned int allocated; /* Length of allocated arrays */
71 hb_glyph_info_t *info;
72 hb_glyph_info_t *out_info;
73 hb_glyph_position_t *pos;
75 inline hb_glyph_info_t &cur (unsigned int i = 0) { return info[idx + i]; }
76 inline hb_glyph_info_t cur (unsigned int i = 0) const { return info[idx + i]; }
78 inline hb_glyph_position_t &cur_pos (unsigned int i = 0) { return pos[idx + i]; }
79 inline hb_glyph_position_t cur_pos (unsigned int i = 0) const { return pos[idx + i]; }
81 inline hb_glyph_info_t &prev (void) { return out_info[out_len - 1]; }
82 inline hb_glyph_info_t prev (void) const { return info[out_len - 1]; }
85 uint8_t allocated_var_bytes[8];
86 const char *allocated_var_owner[8];
91 HB_INTERNAL void reset (void);
93 inline unsigned int backtrack_len (void) const
94 { return have_output? out_len : idx; }
95 inline unsigned int next_serial (void) { return serial++; }
97 HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
98 HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
99 HB_INTERNAL void deallocate_var_all (void);
101 HB_INTERNAL void add (hb_codepoint_t codepoint,
103 unsigned int cluster);
105 HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
106 HB_INTERNAL void reverse (void);
107 HB_INTERNAL void reverse_clusters (void);
108 HB_INTERNAL void guess_properties (void);
110 HB_INTERNAL void swap_buffers (void);
111 HB_INTERNAL void clear_output (void);
112 HB_INTERNAL void clear_positions (void);
113 HB_INTERNAL void replace_glyphs_be16 (unsigned int num_in,
114 unsigned int num_out,
115 const uint16_t *glyph_data_be);
116 HB_INTERNAL void replace_glyphs (unsigned int num_in,
117 unsigned int num_out,
118 const hb_codepoint_t *glyph_data);
119 HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index);
120 /* Makes a copy of the glyph at idx to output and replace glyph_index */
121 HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index);
122 /* Copies glyph at idx to output but doesn't advance idx */
123 HB_INTERNAL void copy_glyph (void);
124 /* Copies glyph at idx to output and advance idx.
125 * If there's no output, just advance idx. */
126 HB_INTERNAL void next_glyph (void);
127 /* Advance idx without copying to output. */
128 inline void skip_glyph (void) { idx++; }
130 inline void reset_masks (hb_mask_t mask)
132 for (unsigned int j = 0; j < len; j++)
135 inline void add_masks (hb_mask_t mask)
137 for (unsigned int j = 0; j < len; j++)
138 info[j].mask |= mask;
140 HB_INTERNAL void set_masks (hb_mask_t value,
142 unsigned int cluster_start,
143 unsigned int cluster_end);
145 HB_INTERNAL void merge_clusters (unsigned int start,
147 HB_INTERNAL void merge_out_clusters (unsigned int start,
150 /* Internal methods */
151 HB_INTERNAL bool enlarge (unsigned int size);
153 inline bool ensure (unsigned int size)
154 { return likely (size <= allocated) ? true : enlarge (size); }
156 HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
158 HB_INTERNAL void *get_scratch_buffer (unsigned int *size);
162 #define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \
163 b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \
164 sizeof (b->info[0].var), owner)
165 #define HB_BUFFER_ALLOCATE_VAR(b, var) \
166 HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var)
167 #define HB_BUFFER_DEALLOCATE_VAR(b, var) \
168 HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var)
172 #endif /* HB_BUFFER_PRIVATE_HH */