| #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<typename IteratorIn, typename IteratorOut, |
| hb_requires (hb_is_source_of (IteratorIn, unsigned int)), |
| hb_requires (hb_is_sink_of (IteratorOut, unsigned))> |
| 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<head> (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<typename Iterator, |
| hb_requires (hb_is_source_of (Iterator, unsigned int))> |
| 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 */ |
