1/*
2 * Copyright © 2011,2014 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, Roozbeh Pournader
25 */
26
27#include "hb.hh"
28
29#include "hb-ot.h"
30
31#include "hb-font.hh"
32#include "hb-machinery.hh"
33#include "hb-ot-face.hh"
34
35#include "hb-ot-cmap-table.hh"
36#include "hb-ot-hmtx-table.hh"
37#include "hb-ot-kern-table.hh"
38#include "hb-ot-post-table.hh"
39#include "hb-ot-glyf-table.hh"
40#include "hb-ot-color-cbdt-table.hh"
41
42
43static hb_bool_t
44hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
45 void *font_data,
46 hb_codepoint_t unicode,
47 hb_codepoint_t *glyph,
48 void *user_data HB_UNUSED)
49
50{
51 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
52 return ot_font->cmap.get_relaxed()->get_nominal_glyph (unicode, glyph);
53}
54
55static hb_bool_t
56hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
57 void *font_data,
58 hb_codepoint_t unicode,
59 hb_codepoint_t variation_selector,
60 hb_codepoint_t *glyph,
61 void *user_data HB_UNUSED)
62{
63 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
64 return ot_font->cmap.get_relaxed ()->get_variation_glyph (unicode, variation_selector, glyph);
65}
66
67static hb_position_t
68hb_ot_get_glyph_h_advance (hb_font_t *font,
69 void *font_data,
70 hb_codepoint_t glyph,
71 void *user_data HB_UNUSED)
72{
73 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
74 return font->em_scale_x (ot_font->hmtx.get_relaxed ()->get_advance (glyph, font));
75}
76
77static hb_position_t
78hb_ot_get_glyph_v_advance (hb_font_t *font,
79 void *font_data,
80 hb_codepoint_t glyph,
81 void *user_data HB_UNUSED)
82{
83 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
84 return font->em_scale_y (-(int) ot_font->vmtx.get_relaxed ()->get_advance (glyph, font));
85}
86
87static hb_position_t
88hb_ot_get_glyph_h_kerning (hb_font_t *font,
89 void *font_data,
90 hb_codepoint_t left_glyph,
91 hb_codepoint_t right_glyph,
92 void *user_data HB_UNUSED)
93{
94 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
95 return font->em_scale_x (ot_font->kern->get_h_kerning (left_glyph, right_glyph));
96}
97
98static hb_bool_t
99hb_ot_get_glyph_extents (hb_font_t *font,
100 void *font_data,
101 hb_codepoint_t glyph,
102 hb_glyph_extents_t *extents,
103 void *user_data HB_UNUSED)
104{
105 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
106 bool ret = ot_font->glyf->get_extents (glyph, extents);
107 if (!ret)
108 ret = ot_font->CBDT->get_extents (glyph, extents);
109 // TODO Hook up side-bearings variations.
110 extents->x_bearing = font->em_scale_x (extents->x_bearing);
111 extents->y_bearing = font->em_scale_y (extents->y_bearing);
112 extents->width = font->em_scale_x (extents->width);
113 extents->height = font->em_scale_y (extents->height);
114 return ret;
115}
116
117static hb_bool_t
118hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
119 void *font_data,
120 hb_codepoint_t glyph,
121 char *name, unsigned int size,
122 void *user_data HB_UNUSED)
123{
124 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
125 return ot_font->post->get_glyph_name (glyph, name, size);
126}
127
128static hb_bool_t
129hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
130 void *font_data,
131 const char *name, int len,
132 hb_codepoint_t *glyph,
133 void *user_data HB_UNUSED)
134{
135 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
136 return ot_font->post->get_glyph_from_name (name, len, glyph);
137}
138
139static hb_bool_t
140hb_ot_get_font_h_extents (hb_font_t *font,
141 void *font_data,
142 hb_font_extents_t *metrics,
143 void *user_data HB_UNUSED)
144{
145 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
146 metrics->ascender = font->em_scale_y (ot_font->hmtx.get_relaxed ()->ascender);
147 metrics->descender = font->em_scale_y (ot_font->hmtx.get_relaxed ()->descender);
148 metrics->line_gap = font->em_scale_y (ot_font->hmtx.get_relaxed ()->line_gap);
149 // TODO Hook up variations.
150 return ot_font->hmtx.get_relaxed ()->has_font_extents;
151}
152
153static hb_bool_t
154hb_ot_get_font_v_extents (hb_font_t *font,
155 void *font_data,
156 hb_font_extents_t *metrics,
157 void *user_data HB_UNUSED)
158{
159 const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
160 metrics->ascender = font->em_scale_x (ot_font->vmtx.get_relaxed ()->ascender);
161 metrics->descender = font->em_scale_x (ot_font->vmtx.get_relaxed ()->descender);
162 metrics->line_gap = font->em_scale_x (ot_font->vmtx.get_relaxed ()->line_gap);
163 // TODO Hook up variations.
164 return ot_font->vmtx.get_relaxed ()->has_font_extents;
165}
166
167#ifdef HB_USE_ATEXIT
168static void free_static_ot_funcs (void);
169#endif
170
171static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t>
172{
173 static inline hb_font_funcs_t *create (void)
174 {
175 hb_font_funcs_t *funcs = hb_font_funcs_create ();
176
177 hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
178 hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
179 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
180 hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
181 hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr);
182 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, nullptr);
183 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
184 //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
185 hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr);
186 //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
187 hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
188 //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
189 hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
190 hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
191
192 hb_font_funcs_make_immutable (funcs);
193
194#ifdef HB_USE_ATEXIT
195 atexit (free_static_ot_funcs);
196#endif
197
198 return funcs;
199 }
200} static_ot_funcs;
201
202#ifdef HB_USE_ATEXIT
203static
204void free_static_ot_funcs (void)
205{
206 static_ot_funcs.free_instance ();
207}
208#endif
209
210static hb_font_funcs_t *
211_hb_ot_get_font_funcs (void)
212{
213 return static_ot_funcs.get_unconst ();
214}
215
216
217/**
218 * hb_ot_font_set_funcs:
219 *
220 * Since: 0.9.28
221 **/
222void
223hb_ot_font_set_funcs (hb_font_t *font)
224{
225 if (unlikely (!hb_ot_shaper_face_data_ensure (font->face))) return;
226 hb_ot_face_data_t *ot_font = hb_ot_face_data (font->face);
227
228 /* Load them lazies. We access them with get_relaxed() for performance. */
229 ot_font->cmap.get ();
230 ot_font->hmtx.get ();
231 ot_font->vmtx.get ();
232
233 hb_font_set_funcs (font,
234 _hb_ot_get_font_funcs (),
235 ot_font,
236 nullptr);
237}
238