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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 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 */
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