15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright © 2011 Google, Inc. 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This is part of HarfBuzz, a text shaping library. 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Permission is hereby granted, without written agreement and without 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * license or royalty fees, to use, copy, modify, and distribute this 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * software and its documentation for any purpose, provided that the 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * above copyright notice and the following two paragraphs appear in 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * all copies of this software. 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DAMAGE. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Google Author(s): Behdad Esfahbod 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define HB_SHAPER fallback 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "hb-shaper-impl-private.hh" 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * shaper face data 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct hb_fallback_shaper_face_data_t {}; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)hb_fallback_shaper_face_data_t * 382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)_hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void 442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)_hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * shaper font data 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct hb_fallback_shaper_font_data_t {}; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)hb_fallback_shaper_font_data_t * 562a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)_hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void 622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)_hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * shaper shape_plan data 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct hb_fallback_shaper_shape_plan_data_t {}; 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)hb_fallback_shaper_shape_plan_data_t * 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)_hb_fallback_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const hb_feature_t *user_features HB_UNUSED, 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int num_user_features HB_UNUSED) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)_hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * shaper 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)hb_bool_t 922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)_hb_fallback_shape (hb_shape_plan_t *shape_plan HB_UNUSED, 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const hb_feature_t *features HB_UNUSED, 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int num_features HB_UNUSED) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 9823730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) /* TODO 9923730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * 10023730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * - Apply fallback kern. 10123730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * - Handle Variation Selectors? 10223730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * - Apply normalization? 10323730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * 10423730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * This will make the fallback shaper into a dumb "TrueType" 10523730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) * shaper which many people unfortunately still request. 10623730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) */ 10723730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_codepoint_t space; 1095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) bool has_space = font->get_glyph (' ', 0, &space); 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->clear_positions (); 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_direction_t direction = buffer->props.direction; 1145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_unicode_funcs_t *unicode = buffer->unicode; 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count = buffer->len; 1165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_glyph_info_t *info = buffer->info; 1175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_glyph_position_t *pos = buffer->pos; 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 0; i < count; i++) 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (has_space && unicode->is_default_ignorable (info[i].codepoint)) { 1215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) info[i].codepoint = space; 1225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) pos[i].x_advance = 0; 1235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) pos[i].y_advance = 0; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) font->get_glyph (info[i].codepoint, 0, &info[i].codepoint); 1275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) font->get_glyph_advance_for_direction (info[i].codepoint, 1285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) direction, 1295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) &pos[i].x_advance, 1305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) &pos[i].y_advance); 1315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) font->subtract_glyph_origin_for_direction (info[i].codepoint, 1325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) direction, 1335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) &pos[i].x_offset, 1345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) &pos[i].y_offset); 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (HB_DIRECTION_IS_BACKWARD (direction)) 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_reverse (buffer); 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 142