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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh')
| -rw-r--r-- | gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh b/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh new file mode 100644 index 0000000000..d0a5a132f0 --- /dev/null +++ b/gfx/harfbuzz/src/OT/glyf/glyf-helpers.hh @@ -0,0 +1,127 @@ +#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 */ |