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 * fvar/avar
37 */
38
39static inline const OT::fvar&
40_get_fvar (hb_face_t *face)
41{
42 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::fvar);
43 hb_ot_face_data_t *layout = hb_ot_face_data (face);
44 return *(layout->fvar.get ());
45}
46static inline const OT::avar&
47_get_avar (hb_face_t *face)
48{
49 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::avar);
50 hb_ot_face_data_t *layout = hb_ot_face_data (face);
51 return *(layout->avar.get ());
52}
53
54/**
55 * hb_ot_var_has_data:
56 * @face: #hb_face_t to test
57 *
58 * This function allows to verify the presence of OpenType variation data on the face.
59 * Alternatively, use hb_ot_var_get_axis_count().
60 *
61 * Return value: true if face has a `fvar' table and false otherwise
62 *
63 * Since: 1.4.2
64 **/
65hb_bool_t
66hb_ot_var_has_data (hb_face_t *face)
67{
68 return _get_fvar (face).has_data ();
69}
70
71/**
72 * hb_ot_var_get_axis_count:
73 *
74 * Since: 1.4.2
75 **/
76unsigned int
77hb_ot_var_get_axis_count (hb_face_t *face)
78{
79 const OT::fvar &fvar = _get_fvar (face);
80 return fvar.get_axis_count ();
81}
82
83/**
84 * hb_ot_var_get_axes:
85 *
86 * Since: 1.4.2
87 **/
88unsigned int
89hb_ot_var_get_axes (hb_face_t *face,
90 unsigned int start_offset,
91 unsigned int *axes_count /* IN/OUT */,
92 hb_ot_var_axis_t *axes_array /* OUT */)
93{
94 const OT::fvar &fvar = _get_fvar (face);
95 return fvar.get_axis_infos (start_offset, axes_count, axes_array);
96}
97
98/**
99 * hb_ot_var_find_axis:
100 *
101 * Since: 1.4.2
102 **/
103hb_bool_t
104hb_ot_var_find_axis (hb_face_t *face,
105 hb_tag_t axis_tag,
106 unsigned int *axis_index,
107 hb_ot_var_axis_t *axis_info)
108{
109 const OT::fvar &fvar = _get_fvar (face);
110 return fvar.find_axis (axis_tag, axis_index, axis_info);
111}
112
113
114/**
115 * hb_ot_var_normalize_variations:
116 *
117 * Since: 1.4.2
118 **/
119void
120hb_ot_var_normalize_variations (hb_face_t *face,
121 const hb_variation_t *variations, /* IN */
122 unsigned int variations_length,
123 int *coords, /* OUT */
124 unsigned int coords_length)
125{
126 for (unsigned int i = 0; i < coords_length; i++)
127 coords[i] = 0;
128
129 const OT::fvar &fvar = _get_fvar (face);
130 for (unsigned int i = 0; i < variations_length; i++)
131 {
132 unsigned int axis_index;
133 if (hb_ot_var_find_axis (face, variations[i].tag, &axis_index, nullptr) &&
134 axis_index < coords_length)
135 coords[axis_index] = fvar.normalize_axis_value (axis_index, variations[i].value);
136 }
137
138 const OT::avar &avar = _get_avar (face);
139 avar.map_coords (coords, coords_length);
140}
141
142/**
143 * hb_ot_var_normalize_coords:
144 *
145 * Since: 1.4.2
146 **/
147void
148hb_ot_var_normalize_coords (hb_face_t *face,
149 unsigned int coords_length,
150 const float *design_coords, /* IN */
151 int *normalized_coords /* OUT */)
152{
153 const OT::fvar &fvar = _get_fvar (face);
154 for (unsigned int i = 0; i < coords_length; i++)
155 normalized_coords[i] = fvar.normalize_axis_value (i, design_coords[i]);
156
157 const OT::avar &avar = _get_avar (face);
158 avar.map_coords (normalized_coords, coords_length);
159}
160