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 * Google Author(s): Behdad Esfahbod
25 */
26
27 #include "hb-open-type.hh"
28
29 #include "hb-ot-face.hh"
30 #include "hb-ot-var-avar-table.hh"
31 #include "hb-ot-var-fvar-table.hh"
32 #include "hb-ot-var-mvar-table.hh"
33 #include "hb-ot-var.h"
34
35
36 /**
37 * SECTION:hb-ot-var
38 * @title: hb-ot-var
39 * @short_description: OpenType Font Variations
40 * @include: hb-ot.h
41 *
42 * Functions for fetching information about OpenType Variable Fonts.
43 **/
44
45
46 /*
47 * fvar/avar
48 */
49
50
51 /**
52 * hb_ot_var_has_data:
53 * @face: #hb_face_t to test
54 *
55 * This function allows to verify the presence of OpenType variation data on the face.
56 *
57 * Return value: true if face has a `fvar' table and false otherwise
58 *
59 * Since: 1.4.2
60 **/
61 hb_bool_t
62 hb_ot_var_has_data (hb_face_t *face)
63 {
64 return face->table.fvar->has_data ();
65 }
66
67 /**
68 * hb_ot_var_get_axis_count:
69 *
70 * Since: 1.4.2
71 **/
72 unsigned int
73 hb_ot_var_get_axis_count (hb_face_t *face)
74 {
75 return face->table.fvar->get_axis_count ();
76 }
77
78 /**
79 * hb_ot_var_get_axes:
80 *
81 * Since: 1.4.2
82 * Deprecated: 2.2.0
83 **/
84 unsigned int
85 hb_ot_var_get_axes (hb_face_t *face,
86 unsigned int start_offset,
87 unsigned int *axes_count /* IN/OUT */,
88 hb_ot_var_axis_t *axes_array /* OUT */)
89 {
90 return face->table.fvar->get_axes_deprecated (start_offset, axes_count, axes_array);
91 }
92
93 /**
94 * hb_ot_var_find_axis:
95 *
96 * Since: 1.4.2
97 * Deprecated: 2.2.0
98 **/
99 hb_bool_t
100 hb_ot_var_find_axis (hb_face_t *face,
101 hb_tag_t axis_tag,
102 unsigned int *axis_index,
103 hb_ot_var_axis_t *axis_info)
104 {
105 return face->table.fvar->find_axis_deprecated (axis_tag, axis_index, axis_info);
106 }
107
108 /**
109 * hb_ot_var_get_axis_infos:
110 *
111 * Since: 2.2.0
112 **/
113 HB_EXTERN unsigned int
114 hb_ot_var_get_axis_infos (hb_face_t *face,
115 unsigned int start_offset,
116 unsigned int *axes_count /* IN/OUT */,
117 hb_ot_var_axis_info_t *axes_array /* OUT */)
118 {
119 return face->table.fvar->get_axis_infos (start_offset, axes_count, axes_array);
120 }
121
122 /**
123 * hb_ot_var_find_axis_info:
124 *
125 * Since: 2.2.0
126 **/
127 HB_EXTERN hb_bool_t
128 hb_ot_var_find_axis_info (hb_face_t *face,
129 hb_tag_t axis_tag,
130 hb_ot_var_axis_info_t *axis_info)
131 {
132 return face->table.fvar->find_axis_info (axis_tag, axis_info);
133 }
134
135
136 /*
137 * Named instances.
138 */
139
140 unsigned int
141 hb_ot_var_get_named_instance_count (hb_face_t *face)
142 {
143 return face->table.fvar->get_instance_count ();
144 }
145
146 hb_ot_name_id_t
147 hb_ot_var_named_instance_get_subfamily_name_id (hb_face_t *face,
148 unsigned int instance_index)
149 {
150 return face->table.fvar->get_instance_subfamily_name_id (instance_index);
151 }
152
153 hb_ot_name_id_t
154 hb_ot_var_named_instance_get_postscript_name_id (hb_face_t *face,
155 unsigned int instance_index)
156 {
157 return face->table.fvar->get_instance_postscript_name_id (instance_index);
158 }
159
160 unsigned int
161 hb_ot_var_named_instance_get_design_coords (hb_face_t *face,
162 unsigned int instance_index,
163 unsigned int *coords_length, /* IN/OUT */
164 float *coords /* OUT */)
165 {
166 return face->table.fvar->get_instance_coords (instance_index, coords_length, coords);
167 }
168
169
170 /**
171 * hb_ot_var_normalize_variations:
172 *
173 * Since: 1.4.2
174 **/
175 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 for (unsigned int i = 0; i < coords_length; i++)
183 coords[i] = 0;
184
185 const OT::fvar &fvar = *face->table.fvar;
186 for (unsigned int i = 0; i < variations_length; i++)
187 {
188 hb_ot_var_axis_info_t info;
189 if (hb_ot_var_find_axis_info (face, variations[i].tag, &info) &&
190 info.axis_index < coords_length)
191 coords[info.axis_index] = fvar.normalize_axis_value (info.axis_index, variations[i].value);
192 }
193
194 face->table.avar->map_coords (coords, coords_length);
195 }
196
197 /**
198 * hb_ot_var_normalize_coords:
199 *
200 * Since: 1.4.2
201 **/
202 void
203 hb_ot_var_normalize_coords (hb_face_t *face,
204 unsigned int coords_length,
205 const float *design_coords, /* IN */
206 int *normalized_coords /* OUT */)
207 {
208 const OT::fvar &fvar = *face->table.fvar;
209 for (unsigned int i = 0; i < coords_length; i++)
210 normalized_coords[i] = fvar.normalize_axis_value (i, design_coords[i]);
211
212 face->table.avar->map_coords (normalized_coords, coords_length);
213 }