| #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 TypeOut, |
| hb_requires (hb_is_source_of (IteratorIn, unsigned int))> |
| static void |
| _write_loca (IteratorIn&& it, |
| const hb_sorted_vector_t<hb_codepoint_pair_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 %u 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<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; |
| 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<typename Iterator, |
| hb_requires (hb_is_source_of (Iterator, unsigned int))> |
| 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 */ |
