#ifndef OT_GLYF_GLYF_HELPERS_HH #define OT_GLYF_GLYF_HELPERS_HH #include "../../hb-open-type.hh" #include "../../hb-subset-plan.hh" #include "loca.hh" namespace OT { namespace glyf_impl { template static void _write_loca (IteratorIn&& it, bool short_offsets, IteratorOut&& dest) { unsigned right_shift = short_offsets ? 1 : 0; unsigned int offset = 0; dest << 0; + it | hb_map ([=, &offset] (unsigned int padded_size) { offset += padded_size; DEBUG_MSG (SUBSET, nullptr, "loca entry offset %d", offset); return offset >> right_shift; }) | hb_sink (dest) ; } static bool _add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca) { hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table (plan->source); hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob); hb_blob_destroy (head_blob); if (unlikely (!head_prime_blob)) return false; head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr); head_prime->indexToLocFormat = use_short_loca ? 0 : 1; bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob); hb_blob_destroy (head_prime_blob); return success; } template static bool _add_loca_and_head (hb_subset_plan_t * plan, Iterator padded_offsets, bool use_short_loca) { unsigned num_offsets = padded_offsets.len () + 1; unsigned entry_size = use_short_loca ? 2 : 4; char *loca_prime_data = (char *) hb_calloc (entry_size, num_offsets); if (unlikely (!loca_prime_data)) return false; DEBUG_MSG (SUBSET, nullptr, "loca entry_size %d num_offsets %d size %d", entry_size, num_offsets, entry_size * num_offsets); if (use_short_loca) _write_loca (padded_offsets, true, hb_array ((HBUINT16 *) loca_prime_data, num_offsets)); else _write_loca (padded_offsets, false, hb_array ((HBUINT32 *) loca_prime_data, num_offsets)); hb_blob_t *loca_blob = hb_blob_create (loca_prime_data, entry_size * num_offsets, HB_MEMORY_MODE_WRITABLE, loca_prime_data, hb_free); bool result = plan->add_table (HB_OT_TAG_loca, loca_blob) && _add_head_and_set_loca_version (plan, use_short_loca); hb_blob_destroy (loca_blob); return result; } } /* namespace glyf_impl */ } /* namespace OT */ #endif /* OT_GLYF_GLYF_HELPERS_HH */