glyf-helpers.hh - mozsearch

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#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 %" 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<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 */