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 41 struct 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 53 static 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 (1, 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, ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */ 64 ot_font->glyf.init (face); 65 ot_font->cbdt.init (face); 66 ot_font->post.init (face); 67 ot_font->kern.init (face); 68 69 return ot_font; 70 } 71 72 static 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 (ot_font); 86 } 87 88 89 static hb_bool_t 90 hb_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 } 100 101 static hb_bool_t 102 hb_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 } 112 113 static hb_position_t 114 hb_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 (ot_font->h_metrics.get_advance (glyph, font)); 121 } 122 123 static hb_position_t 124 hb_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 (-(int) ot_font->v_metrics.get_advance (glyph, font)); 131 } 132 133 static hb_position_t 134 hb_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 (ot_font->kern->get_h_kerning (left_glyph, right_glyph)); 142 } 143 144 static hb_bool_t 145 hb_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 (extents->x_bearing); 157 extents->y_bearing = font->em_scale_y (extents->y_bearing); 158 extents->width = font->em_scale_x (extents->width); 159 extents->height = font->em_scale_y (extents->height); 160 return ret; 161 } 162 163 static hb_bool_t 164 hb_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, name, size); 172 } 173 174 static hb_bool_t 175 hb_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 } 184 185 static hb_bool_t 186 hb_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 (ot_font->h_metrics.ascender); 193 metrics->descender = font->em_scale_y (ot_font->h_metrics.descender); 194 metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap); 195 // TODO Hook up variations. 196 return ot_font->h_metrics.has_font_extents; 197 } 198 199 static hb_bool_t 200 hb_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 (ot_font->v_metrics.ascender); 207 metrics->descender = font->em_scale_x (ot_font->v_metrics.descender); 208 metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap); 209 // TODO Hook up variations. 210 return ot_font->v_metrics.has_font_extents; 211 } 212 213 static hb_font_funcs_t *static_ot_funcs = nullptr; 214 215 #ifdef HB_USE_ATEXIT 216 static 217 void free_static_ot_funcs (void) 218 { 219 hb_font_funcs_destroy (static_ot_funcs); 220 } 221 #endif 222 223 static hb_font_funcs_t * 224 _hb_ot_get_font_funcs (void) 225 { 226 retry: 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 (funcs, hb_ot_get_font_h_extents, nullptr, nullptr); 234 hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr); 235 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr); 236 hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr); 237 hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr); 238 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, 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 (funcs, hb_ot_get_glyph_h_kerning, nullptr, 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 (funcs, hb_ot_get_glyph_extents, nullptr, 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 (funcs, hb_ot_get_glyph_name, nullptr, nullptr); 246 hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr); 247 248 hb_font_funcs_make_immutable (funcs); 249 250 if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, nullptr, funcs)) { 251 hb_font_funcs_destroy (funcs); 252 goto retry; 253 } 254 255 #ifdef HB_USE_ATEXIT 256 atexit (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 **/ 269 void 270 hb_ot_font_set_funcs (hb_font_t *font) 271 { 272 hb_ot_font_t *ot_font = _hb_ot_font_create (font->face); 273 if (unlikely (!ot_font)) 274 return; 275 276 hb_font_set_funcs (font, 277 _hb_ot_get_font_funcs (), 278 ot_font, 279 _hb_ot_font_destroy); 280 } 281
