1 : /*
2 : * Copyright © 2009 Red Hat, Inc.
3 : *
4 : * This is part of HarfBuzz, a text shaping library.
5 : *
6 : * Permission is hereby granted, without written agreement and without
7 : * license or royalty fees, to use, copy, modify, and distribute this
8 : * software and its documentation for any purpose, provided that the
9 : * above copyright notice and the following two paragraphs appear in
10 : * all copies of this software.
11 : *
12 : * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 : * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 : * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 : * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 : * DAMAGE.
17 : *
18 : * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 : * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 : * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 : * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 : * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 : *
24 : * Red Hat Author(s): Behdad Esfahbod
25 : */
26 :
27 : #include "hb-private.hh"
28 :
29 : #include "hb-shape.h"
30 :
31 : #include "hb-buffer-private.hh"
32 :
33 : #ifdef HAVE_GRAPHITE
34 : #include "hb-graphite2.h"
35 : #endif
36 : #ifdef HAVE_UNISCRIBE
37 : # include "hb-uniscribe.h"
38 : #endif
39 : #ifdef HAVE_OT
40 : # include "hb-ot-shape.h"
41 : #endif
42 : #include "hb-fallback-shape-private.hh"
43 :
44 : typedef hb_bool_t (*hb_shape_func_t) (hb_font_t *font,
45 : hb_buffer_t *buffer,
46 : const hb_feature_t *features,
47 : unsigned int num_features,
48 : const char * const *shaper_options);
49 :
50 : #define HB_SHAPER_IMPLEMENT(name) {#name, hb_##name##_shape}
51 : static struct hb_shaper_pair_t {
52 : char name[16];
53 : hb_shape_func_t func;
54 : } shapers[] = {
55 : /* v--- Add new shapers in the right place here */
56 : #ifdef HAVE_GRAPHITE
57 : HB_SHAPER_IMPLEMENT (graphite),
58 : #endif
59 : #ifdef HAVE_UNISCRIBE
60 : HB_SHAPER_IMPLEMENT (uniscribe),
61 : #endif
62 : #ifdef HAVE_OT
63 : HB_SHAPER_IMPLEMENT (ot),
64 : #endif
65 : HB_SHAPER_IMPLEMENT (fallback) /* should be last */
66 : };
67 : #undef HB_SHAPER_IMPLEMENT
68 :
69 : static struct static_shaper_list_t
70 : {
71 1464 : static_shaper_list_t (void)
72 : {
73 1464 : char *env = getenv ("HB_SHAPER_LIST");
74 1464 : if (env && *env)
75 : {
76 : /* Reorder shaper list to prefer requested shaper list. */
77 0 : unsigned int i = 0;
78 0 : char *end, *p = env;
79 0 : for (;;) {
80 0 : end = strchr (p, ',');
81 0 : if (!end)
82 0 : end = p + strlen (p);
83 :
84 0 : for (unsigned int j = i; j < ARRAY_LENGTH (shapers); j++)
85 0 : if (end - p == (int) strlen (shapers[j].name) &&
86 0 : 0 == strncmp (shapers[j].name, p, end - p))
87 : {
88 : /* Reorder this shaper to position i */
89 0 : struct hb_shaper_pair_t t = shapers[j];
90 0 : memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i));
91 0 : shapers[i] = t;
92 0 : i++;
93 : }
94 :
95 0 : if (!*end)
96 : break;
97 : else
98 0 : p = end + 1;
99 : }
100 : }
101 :
102 : ASSERT_STATIC ((ARRAY_LENGTH (shapers) + 1) * sizeof (*shaper_list) <= sizeof (shaper_list));
103 : unsigned int i;
104 4392 : for (i = 0; i < ARRAY_LENGTH (shapers); i++)
105 2928 : shaper_list[i] = shapers[i].name;
106 1464 : shaper_list[i] = NULL;
107 1464 : }
108 :
109 : const char *shaper_list[ARRAY_LENGTH (shapers) + 1];
110 1464 : } static_shaper_list;
111 :
112 : const char **
113 0 : hb_shape_list_shapers (void)
114 : {
115 0 : return static_shaper_list.shaper_list;
116 : }
117 :
118 : hb_bool_t
119 0 : hb_shape_full (hb_font_t *font,
120 : hb_buffer_t *buffer,
121 : const hb_feature_t *features,
122 : unsigned int num_features,
123 : const char * const *shaper_options,
124 : const char * const *shaper_list)
125 : {
126 0 : if (likely (!shaper_list)) {
127 0 : for (unsigned int i = 0; i < ARRAY_LENGTH (shapers); i++)
128 0 : if (likely (shapers[i].func (font, buffer,
129 : features, num_features,
130 : shaper_options)))
131 0 : return TRUE;
132 : } else {
133 0 : while (*shaper_list) {
134 0 : for (unsigned int i = 0; i < ARRAY_LENGTH (shapers); i++)
135 0 : if (0 == strcmp (*shaper_list, shapers[i].name)) {
136 0 : if (likely (shapers[i].func (font, buffer,
137 : features, num_features,
138 : shaper_options)))
139 0 : return TRUE;
140 0 : break;
141 : }
142 0 : shaper_list++;
143 : }
144 : }
145 0 : return FALSE;
146 : }
147 :
148 : void
149 0 : hb_shape (hb_font_t *font,
150 : hb_buffer_t *buffer,
151 : const hb_feature_t *features,
152 : unsigned int num_features)
153 : {
154 0 : hb_shape_full (font, buffer, features, num_features, NULL, NULL);
155 4392 : }
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