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-private.hh"
28
29#include "hb-ot.h"
30
31#include "hb-font-private.hh"
32
33#include "hb-ot-cmap-table.hh"
34#include "hb-ot-cbdt-table.hh"
35#include "hb-ot-glyf-table.hh"
36#include "hb-ot-hmtx-table.hh"
37#include "hb-ot-kern-table.hh"
38#include "hb-ot-post-table.hh"
39
40
41struct hb_ot_font_t
42{
43 OT::cmap::accelerator_t cmap;
44 OT::hmtx::accelerator_t h_metrics;
45 OT::vmtx::accelerator_t v_metrics;
46 OT::hb_lazy_loader_t<OT::glyf::accelerator_t> glyf;
47 OT::hb_lazy_loader_t<OT::CBDT::accelerator_t> cbdt;
48 OT::hb_lazy_loader_t<OT::post::accelerator_t> post;
49 OT::hb_lazy_loader_t<OT::kern::accelerator_t> kern;
50};
51
52
53static hb_ot_font_t *
54_hb_ot_font_create (hb_face_t *face)
55{
56 hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (nmemb: 1, size: sizeof (hb_ot_font_t));
57
58 if (unlikely (!ot_font))
59 return nullptr;
60
61 ot_font->cmap.init (face);
62 ot_font->h_metrics.init (face);
63 ot_font->v_metrics.init (face, default_advance_: ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */
64 ot_font->glyf.init (face_: face);
65 ot_font->cbdt.init (face_: face);
66 ot_font->post.init (face_: face);
67 ot_font->kern.init (face_: face);
68
69 return ot_font;
70}
71
72static void
73_hb_ot_font_destroy (void *data)
74{
75 hb_ot_font_t *ot_font = (hb_ot_font_t *) data;
76
77 ot_font->cmap.fini ();
78 ot_font->h_metrics.fini ();
79 ot_font->v_metrics.fini ();
80 ot_font->glyf.fini ();
81 ot_font->cbdt.fini ();
82 ot_font->post.fini ();
83 ot_font->kern.fini ();
84
85 free (ptr: ot_font);
86}
87
88
89static hb_bool_t
90hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
91 void *font_data,
92 hb_codepoint_t unicode,
93 hb_codepoint_t *glyph,
94 void *user_data HB_UNUSED)
95
96{
97 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
98 return ot_font->cmap.get_nominal_glyph (unicode, glyph);
99}
100
101static hb_bool_t
102hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
103 void *font_data,
104 hb_codepoint_t unicode,
105 hb_codepoint_t variation_selector,
106 hb_codepoint_t *glyph,
107 void *user_data HB_UNUSED)
108{
109 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
110 return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
111}
112
113static hb_position_t
114hb_ot_get_glyph_h_advance (hb_font_t *font,
115 void *font_data,
116 hb_codepoint_t glyph,
117 void *user_data HB_UNUSED)
118{
119 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
120 return font->em_scale_x (v: ot_font->h_metrics.get_advance (glyph, font));
121}
122
123static hb_position_t
124hb_ot_get_glyph_v_advance (hb_font_t *font,
125 void *font_data,
126 hb_codepoint_t glyph,
127 void *user_data HB_UNUSED)
128{
129 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
130 return font->em_scale_y (v: -(int) ot_font->v_metrics.get_advance (glyph, font));
131}
132
133static hb_position_t
134hb_ot_get_glyph_h_kerning (hb_font_t *font,
135 void *font_data,
136 hb_codepoint_t left_glyph,
137 hb_codepoint_t right_glyph,
138 void *user_data HB_UNUSED)
139{
140 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
141 return font->em_scale_x (v: ot_font->kern->get_h_kerning (left: left_glyph, right: right_glyph));
142}
143
144static hb_bool_t
145hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
146 void *font_data,
147 hb_codepoint_t glyph,
148 hb_glyph_extents_t *extents,
149 void *user_data HB_UNUSED)
150{
151 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
152 bool ret = ot_font->glyf->get_extents (glyph, extents);
153 if (!ret)
154 ret = ot_font->cbdt->get_extents (glyph, extents);
155 // TODO Hook up side-bearings variations.
156 extents->x_bearing = font->em_scale_x (v: extents->x_bearing);
157 extents->y_bearing = font->em_scale_y (v: extents->y_bearing);
158 extents->width = font->em_scale_x (v: extents->width);
159 extents->height = font->em_scale_y (v: extents->height);
160 return ret;
161}
162
163static hb_bool_t
164hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
165 void *font_data,
166 hb_codepoint_t glyph,
167 char *name, unsigned int size,
168 void *user_data HB_UNUSED)
169{
170 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
171 return ot_font->post->get_glyph_name (glyph, buf: name, buf_len: size);
172}
173
174static hb_bool_t
175hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
176 void *font_data,
177 const char *name, int len,
178 hb_codepoint_t *glyph,
179 void *user_data HB_UNUSED)
180{
181 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
182 return ot_font->post->get_glyph_from_name (name, len, glyph);
183}
184
185static hb_bool_t
186hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
187 void *font_data,
188 hb_font_extents_t *metrics,
189 void *user_data HB_UNUSED)
190{
191 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
192 metrics->ascender = font->em_scale_y (v: ot_font->h_metrics.ascender);
193 metrics->descender = font->em_scale_y (v: ot_font->h_metrics.descender);
194 metrics->line_gap = font->em_scale_y (v: ot_font->h_metrics.line_gap);
195 // TODO Hook up variations.
196 return ot_font->h_metrics.has_font_extents;
197}
198
199static hb_bool_t
200hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
201 void *font_data,
202 hb_font_extents_t *metrics,
203 void *user_data HB_UNUSED)
204{
205 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
206 metrics->ascender = font->em_scale_x (v: ot_font->v_metrics.ascender);
207 metrics->descender = font->em_scale_x (v: ot_font->v_metrics.descender);
208 metrics->line_gap = font->em_scale_x (v: ot_font->v_metrics.line_gap);
209 // TODO Hook up variations.
210 return ot_font->v_metrics.has_font_extents;
211}
212
213static hb_font_funcs_t *static_ot_funcs = nullptr;
214
215#ifdef HB_USE_ATEXIT
216static
217void free_static_ot_funcs (void)
218{
219 hb_font_funcs_destroy (ffuncs: static_ot_funcs);
220}
221#endif
222
223static hb_font_funcs_t *
224_hb_ot_get_font_funcs (void)
225{
226retry:
227 hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);
228
229 if (unlikely (!funcs))
230 {
231 funcs = hb_font_funcs_create ();
232
233 hb_font_funcs_set_font_h_extents_func (ffuncs: funcs, func: hb_ot_get_font_h_extents, user_data: nullptr, destroy: nullptr);
234 hb_font_funcs_set_font_v_extents_func (ffuncs: funcs, func: hb_ot_get_font_v_extents, user_data: nullptr, destroy: nullptr);
235 hb_font_funcs_set_nominal_glyph_func (ffuncs: funcs, func: hb_ot_get_nominal_glyph, user_data: nullptr, destroy: nullptr);
236 hb_font_funcs_set_variation_glyph_func (ffuncs: funcs, func: hb_ot_get_variation_glyph, user_data: nullptr, destroy: nullptr);
237 hb_font_funcs_set_glyph_h_advance_func (ffuncs: funcs, func: hb_ot_get_glyph_h_advance, user_data: nullptr, destroy: nullptr);
238 hb_font_funcs_set_glyph_v_advance_func (ffuncs: funcs, func: hb_ot_get_glyph_v_advance, user_data: nullptr, destroy: nullptr);
239 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
240 //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
241 hb_font_funcs_set_glyph_h_kerning_func (ffuncs: funcs, func: hb_ot_get_glyph_h_kerning, user_data: nullptr, destroy: nullptr);
242 //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
243 hb_font_funcs_set_glyph_extents_func (ffuncs: funcs, func: hb_ot_get_glyph_extents, user_data: nullptr, destroy: nullptr);
244 //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
245 hb_font_funcs_set_glyph_name_func (ffuncs: funcs, func: hb_ot_get_glyph_name, user_data: nullptr, destroy: nullptr);
246 hb_font_funcs_set_glyph_from_name_func (ffuncs: funcs, func: hb_ot_get_glyph_from_name, user_data: nullptr, destroy: nullptr);
247
248 hb_font_funcs_make_immutable (ffuncs: funcs);
249
250 if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, nullptr, funcs)) {
251 hb_font_funcs_destroy (ffuncs: funcs);
252 goto retry;
253 }
254
255#ifdef HB_USE_ATEXIT
256 atexit (func: free_static_ot_funcs); /* First person registers atexit() callback. */
257#endif
258 };
259
260 return funcs;
261}
262
263
264/**
265 * hb_ot_font_set_funcs:
266 *
267 * Since: 0.9.28
268 **/
269void
270hb_ot_font_set_funcs (hb_font_t *font)
271{
272 hb_ot_font_t *ot_font = _hb_ot_font_create (face: font->face);
273 if (unlikely (!ot_font))
274 return;
275
276 hb_font_set_funcs (font,
277 klass: _hb_ot_get_font_funcs (),
278 font_data: ot_font,
279 destroy: _hb_ot_font_destroy);
280}
281

source code of qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc