1 /*
2 * Copyright © 2017 Google, 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 #if !defined(HB_OT_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
28 #error "Include <hb-ot.h> instead."
29 #endif
30
31 #ifndef HB_OT_VAR_H
32 #define HB_OT_VAR_H
33
34 #include "hb.h"
35
36 HB_BEGIN_DECLS
37
38 /**
39 * HB_OT_TAG_VAR_AXIS_ITALIC:
40 *
41 * Registered tag for the roman/italic axis.
42 */
43 #define HB_OT_TAG_VAR_AXIS_ITALIC HB_TAG('i','t','a','l')
44
45 /**
46 * HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE:
47 *
48 * Registered tag for the optical-size axis.
49 * <note>Note: The optical-size axis supersedes the OpenType `size` feature.</note>
50 */
51 #define HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE HB_TAG('o','p','s','z')
52
53 /**
54 * HB_OT_TAG_VAR_AXIS_SLANT:
55 *
56 * Registered tag for the slant axis
57 */
58 #define HB_OT_TAG_VAR_AXIS_SLANT HB_TAG('s','l','n','t')
59
60 /**
61 * HB_OT_TAG_VAR_AXIS_WIDTH:
62 *
63 * Registered tag for the width axis.
64 */
65 #define HB_OT_TAG_VAR_AXIS_WIDTH HB_TAG('w','d','t','h')
66
67 /**
68 * HB_OT_TAG_VAR_AXIS_WEIGHT:
69 *
70 * Registered tag for the weight axis.
71 */
72 #define HB_OT_TAG_VAR_AXIS_WEIGHT HB_TAG('w','g','h','t')
73
74
75 /*
76 * fvar / avar
77 */
78
79 HB_EXTERN hb_bool_t
80 hb_ot_var_has_data (hb_face_t *face);
81
82
83 /*
84 * Variation axes.
85 */
86
87
88 HB_EXTERN unsigned int
89 hb_ot_var_get_axis_count (hb_face_t *face);
90
91 /**
92 * hb_ot_var_axis_flags_t:
93 * @HB_OT_VAR_AXIS_FLAG_HIDDEN: The axis should not be exposed directly in user interfaces.
94 *
95 * Flags for #hb_ot_var_axis_info_t.
96 *
97 * Since: 2.2.0
98 */
99 typedef enum { /*< flags >*/
100 HB_OT_VAR_AXIS_FLAG_HIDDEN = 0x00000001u,
101
102 /*< private >*/
103 _HB_OT_VAR_AXIS_FLAG_MAX_VALUE= HB_TAG_MAX_SIGNED /*< skip >*/
104 } hb_ot_var_axis_flags_t;
105
106 /**
107 * hb_ot_var_axis_info_t:
108 * @axis_index: Index of the axis in the variation-axis array
109 * @tag: The #hb_tag_t tag identifying the design variation of the axis
110 * @name_id: The `name` table Name ID that provides display names for the axis
111 * @flags: The #hb_ot_var_axis_flags_t flags for the axis
112 * @min_value: The minimum value on the variation axis that the font covers
113 * @default_value: The position on the variation axis corresponding to the font's defaults
114 * @max_value: The maximum value on the variation axis that the font covers
115 *
116 * Data type for holding variation-axis values.
117 *
118 * The minimum, default, and maximum values are in un-normalized, user scales.
119 *
120 * <note>Note: at present, the only flag defined for @flags is
121 * #HB_OT_VAR_AXIS_FLAG_HIDDEN.</note>
122 *
123 * Since: 2.2.0
124 */
125 typedef struct hb_ot_var_axis_info_t {
126 unsigned int axis_index;
127 hb_tag_t tag;
128 hb_ot_name_id_t name_id;
129 hb_ot_var_axis_flags_t flags;
130 float min_value;
131 float default_value;
132 float max_value;
133 /*< private >*/
134 unsigned int reserved;
135 } hb_ot_var_axis_info_t;
136
137 HB_EXTERN unsigned int
138 hb_ot_var_get_axis_infos (hb_face_t *face,
139 unsigned int start_offset,
140 unsigned int *axes_count /* IN/OUT */,
141 hb_ot_var_axis_info_t *axes_array /* OUT */);
142
143 HB_EXTERN hb_bool_t
144 hb_ot_var_find_axis_info (hb_face_t *face,
145 hb_tag_t axis_tag,
146 hb_ot_var_axis_info_t *axis_info);
147
148
149 /*
150 * Named instances.
151 */
152
153 HB_EXTERN unsigned int
154 hb_ot_var_get_named_instance_count (hb_face_t *face);
155
156 HB_EXTERN hb_ot_name_id_t
157 hb_ot_var_named_instance_get_subfamily_name_id (hb_face_t *face,
158 unsigned int instance_index);
159
160 HB_EXTERN hb_ot_name_id_t
161 hb_ot_var_named_instance_get_postscript_name_id (hb_face_t *face,
162 unsigned int instance_index);
163
164 HB_EXTERN unsigned int
165 hb_ot_var_named_instance_get_design_coords (hb_face_t *face,
166 unsigned int instance_index,
167 unsigned int *coords_length, /* IN/OUT */
168 float *coords /* OUT */);
169
170
171 /*
172 * Conversions.
173 */
174
175 HB_EXTERN void
176 hb_ot_var_normalize_variations (hb_face_t *face,
177 const hb_variation_t *variations, /* IN */
178 unsigned int variations_length,
179 int *coords, /* OUT */
180 unsigned int coords_length);
181
182 HB_EXTERN void
183 hb_ot_var_normalize_coords (hb_face_t *face,
184 unsigned int coords_length,
185 const float *design_coords, /* IN */
186 int *normalized_coords /* OUT */);
187
188
189 HB_END_DECLS
190
191 #endif /* HB_OT_VAR_H */