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-glyf-table.hh"
35 #include "hb-ot-hmtx-table.hh"
36 #include "hb-ot-kern-table.hh"
37 #include "hb-ot-post-table.hh"
38
39 #include "hb-ot-color-cbdt-table.hh"
40
41
42 struct hb_ot_font_t
43 {
44 OT::cmap::accelerator_t cmap;
45 OT::hmtx::accelerator_t h_metrics;
46 OT::vmtx::accelerator_t v_metrics;
47 OT::hb_lazy_loader_t<OT::glyf::accelerator_t> glyf;
48 OT::hb_lazy_loader_t<OT::CBDT::accelerator_t> cbdt;
49 OT::hb_lazy_loader_t<OT::post::accelerator_t> post;
50 OT::hb_lazy_loader_t<OT::kern::accelerator_t> kern;
51 };
52
53
54 static hb_ot_font_t *
_hb_ot_font_create(hb_face_t * face)55 _hb_ot_font_create (hb_face_t *face)
56 {
57 hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t));
58
59 if (unlikely (!ot_font))
60 return nullptr;
61
62 ot_font->cmap.init (face);
63 ot_font->h_metrics.init (face);
64 ot_font->v_metrics.init (face, ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */
65 ot_font->glyf.init (face);
66 ot_font->cbdt.init (face);
67 ot_font->post.init (face);
68 ot_font->kern.init (face);
69
70 return ot_font;
71 }
72
73 static void
_hb_ot_font_destroy(void * data)74 _hb_ot_font_destroy (void *data)
75 {
76 hb_ot_font_t *ot_font = (hb_ot_font_t *) data;
77
78 ot_font->cmap.fini ();
79 ot_font->h_metrics.fini ();
80 ot_font->v_metrics.fini ();
81 ot_font->glyf.fini ();
82 ot_font->cbdt.fini ();
83 ot_font->post.fini ();
84 ot_font->kern.fini ();
85
86 free (ot_font);
87 }
88
89
90 static hb_bool_t
hb_ot_get_nominal_glyph(hb_font_t * font HB_UNUSED,void * font_data,hb_codepoint_t unicode,hb_codepoint_t * glyph,void * user_data HB_UNUSED)91 hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
92 void *font_data,
93 hb_codepoint_t unicode,
94 hb_codepoint_t *glyph,
95 void *user_data HB_UNUSED)
96
97 {
98 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
99 return ot_font->cmap.get_nominal_glyph (unicode, glyph);
100 }
101
102 static hb_bool_t
hb_ot_get_variation_glyph(hb_font_t * font HB_UNUSED,void * font_data,hb_codepoint_t unicode,hb_codepoint_t variation_selector,hb_codepoint_t * glyph,void * user_data HB_UNUSED)103 hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
104 void *font_data,
105 hb_codepoint_t unicode,
106 hb_codepoint_t variation_selector,
107 hb_codepoint_t *glyph,
108 void *user_data HB_UNUSED)
109 {
110 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
111 return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
112 }
113
114 static hb_position_t
hb_ot_get_glyph_h_advance(hb_font_t * font,void * font_data,hb_codepoint_t glyph,void * user_data HB_UNUSED)115 hb_ot_get_glyph_h_advance (hb_font_t *font,
116 void *font_data,
117 hb_codepoint_t glyph,
118 void *user_data HB_UNUSED)
119 {
120 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
121 return font->em_scale_x (ot_font->h_metrics.get_advance (glyph, font));
122 }
123
124 static hb_position_t
hb_ot_get_glyph_v_advance(hb_font_t * font,void * font_data,hb_codepoint_t glyph,void * user_data HB_UNUSED)125 hb_ot_get_glyph_v_advance (hb_font_t *font,
126 void *font_data,
127 hb_codepoint_t glyph,
128 void *user_data HB_UNUSED)
129 {
130 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
131 return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph, font));
132 }
133
134 static hb_position_t
hb_ot_get_glyph_h_kerning(hb_font_t * font,void * font_data,hb_codepoint_t left_glyph,hb_codepoint_t right_glyph,void * user_data HB_UNUSED)135 hb_ot_get_glyph_h_kerning (hb_font_t *font,
136 void *font_data,
137 hb_codepoint_t left_glyph,
138 hb_codepoint_t right_glyph,
139 void *user_data HB_UNUSED)
140 {
141 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
142 return font->em_scale_x (ot_font->kern->get_h_kerning (left_glyph, right_glyph));
143 }
144
145 static hb_bool_t
hb_ot_get_glyph_extents(hb_font_t * font HB_UNUSED,void * font_data,hb_codepoint_t glyph,hb_glyph_extents_t * extents,void * user_data HB_UNUSED)146 hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
147 void *font_data,
148 hb_codepoint_t glyph,
149 hb_glyph_extents_t *extents,
150 void *user_data HB_UNUSED)
151 {
152 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
153 bool ret = ot_font->glyf->get_extents (glyph, extents);
154 if (!ret)
155 ret = ot_font->cbdt->get_extents (glyph, extents);
156 // TODO Hook up side-bearings variations.
157 extents->x_bearing = font->em_scale_x (extents->x_bearing);
158 extents->y_bearing = font->em_scale_y (extents->y_bearing);
159 extents->width = font->em_scale_x (extents->width);
160 extents->height = font->em_scale_y (extents->height);
161 return ret;
162 }
163
164 static hb_bool_t
hb_ot_get_glyph_name(hb_font_t * font HB_UNUSED,void * font_data,hb_codepoint_t glyph,char * name,unsigned int size,void * user_data HB_UNUSED)165 hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
166 void *font_data,
167 hb_codepoint_t glyph,
168 char *name, unsigned int size,
169 void *user_data HB_UNUSED)
170 {
171 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
172 return ot_font->post->get_glyph_name (glyph, name, size);
173 }
174
175 static hb_bool_t
hb_ot_get_glyph_from_name(hb_font_t * font HB_UNUSED,void * font_data,const char * name,int len,hb_codepoint_t * glyph,void * user_data HB_UNUSED)176 hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
177 void *font_data,
178 const char *name, int len,
179 hb_codepoint_t *glyph,
180 void *user_data HB_UNUSED)
181 {
182 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
183 return ot_font->post->get_glyph_from_name (name, len, glyph);
184 }
185
186 static hb_bool_t
hb_ot_get_font_h_extents(hb_font_t * font HB_UNUSED,void * font_data,hb_font_extents_t * metrics,void * user_data HB_UNUSED)187 hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
188 void *font_data,
189 hb_font_extents_t *metrics,
190 void *user_data HB_UNUSED)
191 {
192 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
193 metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender);
194 metrics->descender = font->em_scale_y (ot_font->h_metrics.descender);
195 metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap);
196 // TODO Hook up variations.
197 return ot_font->h_metrics.has_font_extents;
198 }
199
200 static hb_bool_t
hb_ot_get_font_v_extents(hb_font_t * font HB_UNUSED,void * font_data,hb_font_extents_t * metrics,void * user_data HB_UNUSED)201 hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
202 void *font_data,
203 hb_font_extents_t *metrics,
204 void *user_data HB_UNUSED)
205 {
206 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
207 metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender);
208 metrics->descender = font->em_scale_x (ot_font->v_metrics.descender);
209 metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap);
210 // TODO Hook up variations.
211 return ot_font->v_metrics.has_font_extents;
212 }
213
214 static hb_font_funcs_t *static_ot_funcs = nullptr;
215
216 #ifdef HB_USE_ATEXIT
217 static
free_static_ot_funcs(void)218 void free_static_ot_funcs (void)
219 {
220 hb_font_funcs_destroy (static_ot_funcs);
221 }
222 #endif
223
224 static hb_font_funcs_t *
_hb_ot_get_font_funcs(void)225 _hb_ot_get_font_funcs (void)
226 {
227 retry:
228 hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);
229
230 if (unlikely (!funcs))
231 {
232 funcs = hb_font_funcs_create ();
233
234 hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
235 hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
236 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
237 hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
238 hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr);
239 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, nullptr);
240 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
241 //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
242 hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr);
243 //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
244 hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
245 //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
246 hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
247 hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
248
249 hb_font_funcs_make_immutable (funcs);
250
251 if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, nullptr, funcs)) {
252 hb_font_funcs_destroy (funcs);
253 goto retry;
254 }
255
256 #ifdef HB_USE_ATEXIT
257 atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
258 #endif
259 };
260
261 return funcs;
262 }
263
264
265 /**
266 * hb_ot_font_set_funcs:
267 *
268 * Since: 0.9.28
269 **/
270 void
hb_ot_font_set_funcs(hb_font_t * font)271 hb_ot_font_set_funcs (hb_font_t *font)
272 {
273 hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
274 if (unlikely (!ot_font))
275 return;
276
277 hb_font_set_funcs (font,
278 _hb_ot_get_font_funcs (),
279 ot_font,
280 _hb_ot_font_destroy);
281 }
282