1 : /*
2 : * Copyright © 1998-2004 David Turner and Werner Lemberg
3 : * Copyright © 2004,2007,2009,2010 Red Hat, Inc.
4 : * Copyright © 2011 Google, Inc.
5 : *
6 : * This is part of HarfBuzz, a text shaping library.
7 : *
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.
13 : *
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
18 : * DAMAGE.
19 : *
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.
25 : *
26 : * Red Hat Author(s): Owen Taylor, Behdad Esfahbod
27 : * Google Author(s): Behdad Esfahbod
28 : */
29 :
30 : #ifndef HB_BUFFER_PRIVATE_HH
31 : #define HB_BUFFER_PRIVATE_HH
32 :
33 : #include "hb-private.hh"
34 : #include "hb-buffer.h"
35 : #include "hb-object-private.hh"
36 : #include "hb-unicode-private.hh"
37 :
38 :
39 :
40 : ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
41 : ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
42 :
43 : typedef struct _hb_segment_properties_t {
44 : hb_direction_t direction;
45 : hb_script_t script;
46 : hb_language_t language;
47 : } hb_segment_properties_t;
48 :
49 :
50 : struct _hb_buffer_t {
51 : hb_object_header_t header;
52 :
53 : /* Information about how the text in the buffer should be treated */
54 :
55 : hb_unicode_funcs_t *unicode; /* Unicode functions */
56 : hb_segment_properties_t props; /* Script, language, direction */
57 :
58 : /* Buffer contents */
59 :
60 : bool in_error; /* Allocation failed */
61 : bool have_output; /* Whether we have an output buffer going on */
62 : bool have_positions; /* Whether we have positions */
63 :
64 : unsigned int idx; /* Cursor into ->info and ->pos arrays */
65 : unsigned int len; /* Length of ->info and ->pos arrays */
66 : unsigned int out_len; /* Length of ->out array if have_output */
67 :
68 : unsigned int allocated; /* Length of allocated arrays */
69 : hb_glyph_info_t *info;
70 : hb_glyph_info_t *out_info;
71 : hb_glyph_position_t *pos;
72 :
73 : unsigned int serial;
74 : uint8_t allocated_var_bytes[8];
75 : const char *allocated_var_owner[8];
76 :
77 :
78 : /* Methods */
79 :
80 : HB_INTERNAL void reset (void);
81 :
82 0 : inline unsigned int backtrack_len (void) const
83 0 : { return have_output? out_len : idx; }
84 0 : inline unsigned int next_serial (void) { return serial++; }
85 :
86 : HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
87 : HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
88 : HB_INTERNAL void deallocate_var_all (void);
89 :
90 : HB_INTERNAL void add (hb_codepoint_t codepoint,
91 : hb_mask_t mask,
92 : unsigned int cluster);
93 :
94 : HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
95 : HB_INTERNAL void reverse (void);
96 : HB_INTERNAL void reverse_clusters (void);
97 : HB_INTERNAL void guess_properties (void);
98 :
99 : HB_INTERNAL void swap_buffers (void);
100 : HB_INTERNAL void clear_output (void);
101 : HB_INTERNAL void clear_positions (void);
102 : HB_INTERNAL void replace_glyphs_be16 (unsigned int num_in,
103 : unsigned int num_out,
104 : const uint16_t *glyph_data_be);
105 : HB_INTERNAL void replace_glyphs (unsigned int num_in,
106 : unsigned int num_out,
107 : const uint16_t *glyph_data);
108 : HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index);
109 : /* Makes a copy of the glyph at idx to output and replace glyph_index */
110 : HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index);
111 : /* Copies glyph at idx to output but doesn't advance idx */
112 : HB_INTERNAL void copy_glyph (void);
113 : /* Copies glyph at idx to output and advance idx.
114 : * If there's no output, just advance idx. */
115 : HB_INTERNAL void next_glyph (void);
116 : /* Advance idx without copying to output. */
117 0 : inline void skip_glyph (void) { idx++; }
118 :
119 0 : inline void reset_masks (hb_mask_t mask)
120 : {
121 0 : for (unsigned int j = 0; j < len; j++)
122 0 : info[j].mask = mask;
123 0 : }
124 : inline void add_masks (hb_mask_t mask)
125 : {
126 : for (unsigned int j = 0; j < len; j++)
127 : info[j].mask |= mask;
128 : }
129 : HB_INTERNAL void set_masks (hb_mask_t value,
130 : hb_mask_t mask,
131 : unsigned int cluster_start,
132 : unsigned int cluster_end);
133 :
134 : /* Internal methods */
135 : HB_INTERNAL bool enlarge (unsigned int size);
136 :
137 0 : inline bool ensure (unsigned int size)
138 0 : { return likely (size <= allocated) ? TRUE : enlarge (size); }
139 :
140 : HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
141 :
142 : HB_INTERNAL void *get_scratch_buffer (unsigned int *size);
143 : };
144 :
145 :
146 : #define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \
147 : b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \
148 : sizeof (b->info[0].var), owner)
149 : #define HB_BUFFER_ALLOCATE_VAR(b, var) \
150 : HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var)
151 : #define HB_BUFFER_DEALLOCATE_VAR(b, var) \
152 : HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var)
153 :
154 :
155 :
156 : #endif /* HB_BUFFER_PRIVATE_HH */
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