/* * Copyright © 2018 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Google Author(s): Garret Rieger, Roderick Sheeter */ #include "hb-subset-private.hh" #include "hb-subset-plan.hh" #include "hb-ot-cmap-table.hh" #include "hb-ot-glyf-table.hh" static int _hb_codepoint_t_cmp (const void *pa, const void *pb) { hb_codepoint_t a = * (hb_codepoint_t *) pa; hb_codepoint_t b = * (hb_codepoint_t *) pb; return a < b ? -1 : a > b ? +1 : 0; } hb_bool_t hb_subset_plan_new_gid_for_codepoint (hb_subset_plan_t *plan, hb_codepoint_t codepoint, hb_codepoint_t *new_gid) { // TODO actual map, delete this garbage. for (unsigned int i = 0; i < plan->codepoints.len; i++) { if (plan->codepoints[i] != codepoint) continue; if (!hb_subset_plan_new_gid_for_old_id(plan, plan->gids_to_retain[i], new_gid)) { return false; } return true; } return false; } hb_bool_t hb_subset_plan_new_gid_for_old_id (hb_subset_plan_t *plan, hb_codepoint_t old_gid, hb_codepoint_t *new_gid) { // the index in old_gids is the new gid; only up to codepoints.len are valid for (unsigned int i = 0; i < plan->gids_to_retain_sorted.len; i++) { if (plan->gids_to_retain_sorted[i] == old_gid) { *new_gid = i; return true; } } return false; } hb_bool_t hb_subset_plan_add_table (hb_subset_plan_t *plan, hb_tag_t tag, hb_blob_t *contents) { hb_blob_t *source_blob = plan->source->reference_table (tag); DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %d bytes, source %d bytes", HB_UNTAG(tag), hb_blob_get_length (contents), hb_blob_get_length (source_blob)); hb_blob_destroy (source_blob); return hb_subset_face_add_table(plan->dest, tag, contents); } static void _populate_codepoints (hb_set_t *input_codepoints, hb_prealloced_array_t& plan_codepoints) { plan_codepoints.alloc (hb_set_get_population (input_codepoints)); hb_codepoint_t cp = -1; while (hb_set_next (input_codepoints, &cp)) { hb_codepoint_t *wr = plan_codepoints.push(); *wr = cp; } plan_codepoints.qsort (_hb_codepoint_t_cmp); } static void _add_gid_and_children (const OT::glyf::accelerator_t &glyf, hb_codepoint_t gid, hb_set_t *gids_to_retain) { if (hb_set_has (gids_to_retain, gid)) // Already visited this gid, ignore. return; hb_set_add (gids_to_retain, gid); OT::glyf::CompositeGlyphHeader::Iterator composite; if (glyf.get_composite (gid, &composite)) { do { _add_gid_and_children (glyf, (hb_codepoint_t) composite.current->glyphIndex, gids_to_retain); } while (composite.move_to_next()); } } static void _populate_gids_to_retain (hb_face_t *face, hb_prealloced_array_t& codepoints, hb_prealloced_array_t& old_gids, hb_prealloced_array_t& old_gids_sorted) { OT::cmap::accelerator_t cmap; OT::glyf::accelerator_t glyf; cmap.init (face); glyf.init (face); hb_auto_array_t bad_indices; old_gids.alloc (codepoints.len); for (unsigned int i = 0; i < codepoints.len; i++) { hb_codepoint_t gid; if (!cmap.get_nominal_glyph (codepoints[i], &gid)) { gid = -1; *(bad_indices.push ()) = i; } *(old_gids.push ()) = gid; } /* Generally there shouldn't be any */ while (bad_indices.len > 0) { unsigned int i = bad_indices[bad_indices.len - 1]; bad_indices.pop (); DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", codepoints[i]); codepoints.remove (i); old_gids.remove (i); } // Populate a full set of glyphs to retain by adding all referenced // composite glyphs. // TODO expand with glyphs reached by G* hb_set_t * all_gids_to_retain = hb_set_create (); _add_gid_and_children (glyf, 0, all_gids_to_retain); for (unsigned int i = 0; i < old_gids.len; i++) _add_gid_and_children (glyf, old_gids[i], all_gids_to_retain); // Transfer to a sorted list. old_gids_sorted.alloc (hb_set_get_population (all_gids_to_retain)); hb_codepoint_t gid = HB_SET_VALUE_INVALID; while (hb_set_next (all_gids_to_retain, &gid)) *(old_gids_sorted.push ()) = gid; glyf.fini (); cmap.fini (); } /** * hb_subset_plan_create: * Computes a plan for subsetting the supplied face according * to a provide profile and input. The plan describes * which tables and glyphs should be retained. * * Return value: New subset plan. * * Since: 1.7.5 **/ hb_subset_plan_t * hb_subset_plan_create (hb_face_t *face, hb_subset_profile_t *profile, hb_subset_input_t *input) { hb_subset_plan_t *plan = hb_object_create (); plan->codepoints.init(); plan->gids_to_retain.init(); plan->gids_to_retain_sorted.init(); plan->source = hb_face_reference (face); plan->dest = hb_subset_face_create (); plan->drop_hints = input->drop_hints; _populate_codepoints (input->unicodes, plan->codepoints); _populate_gids_to_retain (face, plan->codepoints, plan->gids_to_retain, plan->gids_to_retain_sorted); return plan; } /** * hb_subset_plan_destroy: * * Since: 1.7.5 **/ void hb_subset_plan_destroy (hb_subset_plan_t *plan) { if (!hb_object_destroy (plan)) return; plan->codepoints.finish (); plan->gids_to_retain.finish (); plan->gids_to_retain_sorted.finish (); hb_face_destroy (plan->source); hb_face_destroy (plan->dest); free (plan); }