2 * Copyright © 1998-2004 David Turner and Werner Lemberg
3 * Copyright © 2004,2007,2009,2010 Red Hat, Inc.
4 * Copyright © 2011,2012 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"
39 ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
40 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
48 hb_object_header_t header;
51 /* Information about how the text in the buffer should be treated */
53 hb_unicode_funcs_t *unicode; /* Unicode functions */
54 hb_segment_properties_t props; /* Script, language, direction */
55 hb_buffer_flags_t flags; /* BOT / EOT / etc. */
59 hb_buffer_content_type_t content_type;
61 bool in_error; /* Allocation failed */
62 bool have_output; /* Whether we have an output buffer going on */
63 bool have_positions; /* Whether we have positions */
65 unsigned int idx; /* Cursor into ->info and ->pos arrays */
66 unsigned int len; /* Length of ->info and ->pos arrays */
67 unsigned int out_len; /* Length of ->out array if have_output */
69 unsigned int allocated; /* Length of allocated arrays */
70 hb_glyph_info_t *info;
71 hb_glyph_info_t *out_info;
72 hb_glyph_position_t *pos;
74 inline hb_glyph_info_t &cur (unsigned int i = 0) { return info[idx + i]; }
75 inline hb_glyph_info_t cur (unsigned int i = 0) const { return info[idx + i]; }
77 inline hb_glyph_position_t &cur_pos (unsigned int i = 0) { return pos[idx + i]; }
78 inline hb_glyph_position_t cur_pos (unsigned int i = 0) const { return pos[idx + i]; }
80 inline hb_glyph_info_t &prev (void) { return out_info[out_len - 1]; }
81 inline hb_glyph_info_t prev (void) const { return info[out_len - 1]; }
85 /* These reflect current allocations of the bytes in glyph_info_t's var1 and var2. */
86 uint8_t allocated_var_bytes[8];
87 const char *allocated_var_owner[8];
89 /* Text before / after the main buffer contents.
90 * Always in Unicode, and ordered outward.
91 * Index 0 is for "pre-context", 1 for "post-context". */
92 static const unsigned int CONTEXT_LENGTH = 5;
93 hb_codepoint_t context[2][CONTEXT_LENGTH];
94 unsigned int context_len[2];
99 HB_INTERNAL void reset (void);
100 HB_INTERNAL void clear (void);
102 inline unsigned int backtrack_len (void) const
103 { return have_output? out_len : idx; }
104 inline unsigned int next_serial (void) { return serial++; }
106 HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
107 HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
108 HB_INTERNAL void assert_var (unsigned int byte_i, unsigned int count, const char *owner);
109 HB_INTERNAL void deallocate_var_all (void);
111 HB_INTERNAL void add (hb_codepoint_t codepoint,
112 unsigned int cluster);
114 HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
115 HB_INTERNAL void reverse (void);
116 HB_INTERNAL void reverse_clusters (void);
117 HB_INTERNAL void guess_segment_properties (void);
119 HB_INTERNAL void swap_buffers (void);
120 HB_INTERNAL void remove_output (void);
121 HB_INTERNAL void clear_output (void);
122 HB_INTERNAL void clear_positions (void);
124 HB_INTERNAL void replace_glyphs (unsigned int num_in,
125 unsigned int num_out,
126 const hb_codepoint_t *glyph_data);
128 HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index);
129 /* Makes a copy of the glyph at idx to output and replace glyph_index */
130 HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index);
131 HB_INTERNAL void output_info (hb_glyph_info_t &glyph_info);
132 /* Copies glyph at idx to output but doesn't advance idx */
133 HB_INTERNAL void copy_glyph (void);
134 /* Copies glyph at idx to output and advance idx.
135 * If there's no output, just advance idx. */
141 if (unlikely (out_info != info || out_len != idx)) {
142 if (unlikely (!make_room_for (1, 1))) return;
143 out_info[out_len] = info[idx];
151 /* Advance idx without copying to output. */
152 inline void skip_glyph (void) { idx++; }
154 inline void reset_masks (hb_mask_t mask)
156 for (unsigned int j = 0; j < len; j++)
159 inline void add_masks (hb_mask_t mask)
161 for (unsigned int j = 0; j < len; j++)
162 info[j].mask |= mask;
164 HB_INTERNAL void set_masks (hb_mask_t value,
166 unsigned int cluster_start,
167 unsigned int cluster_end);
169 HB_INTERNAL void merge_clusters (unsigned int start,
171 HB_INTERNAL void merge_out_clusters (unsigned int start,
174 /* Internal methods */
175 HB_INTERNAL bool enlarge (unsigned int size);
177 inline bool ensure (unsigned int size)
178 { return likely (size < allocated) ? true : enlarge (size); }
180 HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
182 HB_INTERNAL void *get_scratch_buffer (unsigned int *size);
184 inline void clear_context (unsigned int side) { context_len[side] = 0; }
188 #define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \
189 b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \
190 sizeof (b->info[0].var), owner)
191 #define HB_BUFFER_ALLOCATE_VAR(b, var) \
192 HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var)
193 #define HB_BUFFER_DEALLOCATE_VAR(b, var) \
194 HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var)
195 #define HB_BUFFER_ASSERT_VAR(b, var) \
196 HB_BUFFER_XALLOCATE_VAR (b, assert_var, var (), #var)
199 #endif /* HB_BUFFER_PRIVATE_HH */