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| author | bruvzg <7645683+bruvzg@users.noreply.github.com> | 2022-07-04 09:11:15 +0300 |
|---|---|---|
| committer | bruvzg <7645683+bruvzg@users.noreply.github.com> | 2022-07-04 09:12:19 +0300 |
| commit | 6c27d9d6244303754e111eccc7c1a42df5b9bca1 (patch) | |
| tree | cddd5118a33a54620edfbe46545ae4872d74e81c /thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh | |
| parent | 41fdddb1f8132dcba8256a145de44da5df3155b2 (diff) | |
HarfBuzz: Update to version 4.4.1
Diffstat (limited to 'thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh b/thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh new file mode 100644 index 0000000000..f51f7a81fc --- /dev/null +++ b/thirdparty/harfbuzz/src/OT/glyf/glyf-helpers.hh @@ -0,0 +1,90 @@ +#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 */ |