#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, const hb_sorted_vector_t new_to_old_gid_list, bool short_offsets, TypeOut *dest, unsigned num_offsets) { unsigned right_shift = short_offsets ? 1 : 0; unsigned offset = 0; TypeOut value; value = 0; *dest++ = value; hb_codepoint_t last = 0; for (auto _ : new_to_old_gid_list) { hb_codepoint_t gid = _.first; for (; last < gid; last++) { DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset); *dest++ = value; } unsigned padded_size = *it++; offset += padded_size; DEBUG_MSG (SUBSET, nullptr, "loca entry gid %" PRIu32 " offset %u padded-size %u", gid, offset, padded_size); value = offset >> right_shift; *dest++ = value; last++; // Skip over gid } unsigned num_glyphs = num_offsets - 1; for (; last < num_glyphs; last++) { DEBUG_MSG (SUBSET, nullptr, "loca entry empty offset %u", offset); *dest++ = value; } } 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; if (plan->normalized_coords) { head_prime->xMin = plan->head_maxp_info.xMin; head_prime->xMax = plan->head_maxp_info.xMax; head_prime->yMin = plan->head_maxp_info.yMin; head_prime->yMax = plan->head_maxp_info.yMax; unsigned orig_flag = head_prime->flags; if (plan->head_maxp_info.allXMinIsLsb) orig_flag |= 1 << 1; else orig_flag &= ~(1 << 1); head_prime->flags = orig_flag; } 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_context_t *c, Iterator padded_offsets, bool use_short_loca) { unsigned num_offsets = c->plan->num_output_glyphs () + 1; unsigned entry_size = use_short_loca ? 2 : 4; char *loca_prime_data = (char *) hb_malloc (entry_size * num_offsets); if (unlikely (!loca_prime_data)) return false; DEBUG_MSG (SUBSET, nullptr, "loca entry_size %u num_offsets %u size %u", entry_size, num_offsets, entry_size * num_offsets); if (use_short_loca) _write_loca (padded_offsets, c->plan->new_to_old_gid_list, true, (HBUINT16 *) loca_prime_data, num_offsets); else _write_loca (padded_offsets, c->plan->new_to_old_gid_list, false, (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 = c->plan->add_table (HB_OT_TAG_loca, loca_blob) && _add_head_and_set_loca_version (c->plan, use_short_loca); hb_blob_destroy (loca_blob); return result; } } /* namespace glyf_impl */ } /* namespace OT */ #endif /* OT_GLYF_GLYF_HELPERS_HH */