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[subset] Add support for updating reference gids in components to their new values.

This commit is contained in:
Garret Rieger 2018-02-16 17:01:00 -07:00 committed by Behdad Esfahbod
parent 49544eb860
commit 2130392dcc
1 changed files with 33 additions and 5 deletions
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38
src/hb-subset-glyf.cc
View File

@ -28,6 +28,7 @@
#include "hb-ot-glyf-table.hh"
#include "hb-set.h"
#include "hb-subset-glyf.hh"
#include "hb-subset-plan.hh"
static bool
_calculate_glyf_and_loca_prime_size (const OT::glyf::accelerator_t &glyf,
@ -70,16 +71,41 @@ _write_loca_entry (unsigned int id, unsigned int offset, bool is_short, void *lo
}
}
static void
_update_components (hb_subset_plan_t * plan,
char * glyph_start,
unsigned int length)
{
OT::glyf::CompositeGlyphHeader::Iterator iterator;
if (OT::glyf::CompositeGlyphHeader::get_iterator (glyph_start,
length,
&iterator))
{
do
{
hb_codepoint_t new_gid;
if (!hb_subset_plan_new_gid_for_old_id (plan,
iterator.current->glyphIndex,
&new_gid))
continue;
((OT::glyf::CompositeGlyphHeader *) iterator.current)->glyphIndex.set (new_gid);
} while (iterator.move_to_next());
}
}
static bool
_write_glyf_and_loca_prime (const OT::glyf::accelerator_t &glyf,
_write_glyf_and_loca_prime (hb_subset_plan_t *plan,
const OT::glyf::accelerator_t &glyf,
const char *glyf_data,
hb_prealloced_array_t<hb_codepoint_t> &glyph_ids,
bool use_short_loca,
int glyf_prime_size,
char *glyf_prime_data /* OUT */,
int loca_prime_size,
char *loca_prime_data /* OUT */)
{
hb_prealloced_array_t<hb_codepoint_t> &glyph_ids = plan->gids_to_retain_sorted;
char *glyf_prime_data_next = glyf_prime_data;
for (unsigned int i = 0; i < glyph_ids.len; i++)
@ -92,6 +118,7 @@ _write_glyf_and_loca_prime (const OT::glyf::accelerator_t &glyf,
memcpy (glyf_prime_data_next, glyf_data + start_offset, length);
_write_loca_entry (i, glyf_prime_data_next - glyf_prime_data, use_short_loca, loca_prime_data);
_update_components (plan, glyf_prime_data_next, end_offset - start_offset);
glyf_prime_data_next += length;
}
@ -104,7 +131,7 @@ _write_glyf_and_loca_prime (const OT::glyf::accelerator_t &glyf,
static bool
_hb_subset_glyf_and_loca (const OT::glyf::accelerator_t &glyf,
const char *glyf_data,
hb_prealloced_array_t<hb_codepoint_t>&glyphs_to_retain,
hb_subset_plan_t *plan,
bool *use_short_loca,
hb_blob_t **glyf_prime /* OUT */,
hb_blob_t **loca_prime /* OUT */)
@ -112,6 +139,7 @@ _hb_subset_glyf_and_loca (const OT::glyf::accelerator_t &glyf,
// TODO(grieger): Sanity check writes to make sure they are in-bounds.
// TODO(grieger): Sanity check allocation size for the new table.
// TODO(grieger): Don't fail on bad offsets, just dump them.
hb_prealloced_array_t<hb_codepoint_t> &glyphs_to_retain = plan->gids_to_retain_sorted;
unsigned int glyf_prime_size;
unsigned int loca_prime_size;
@ -126,7 +154,7 @@ _hb_subset_glyf_and_loca (const OT::glyf::accelerator_t &glyf,
char *glyf_prime_data = (char *) malloc (glyf_prime_size);
char *loca_prime_data = (char *) malloc (loca_prime_size);
if (unlikely (!_write_glyf_and_loca_prime (glyf, glyf_data, glyphs_to_retain,
if (unlikely (!_write_glyf_and_loca_prime (plan, glyf, glyf_data,
*use_short_loca,
glyf_prime_size, glyf_prime_data,
loca_prime_size, loca_prime_data))) {
@ -168,7 +196,7 @@ hb_subset_glyf_and_loca (hb_subset_plan_t *plan,
glyf.init(plan->source);
bool result = _hb_subset_glyf_and_loca (glyf,
glyf_data,
plan->gids_to_retain_sorted,
plan,
use_short_loca,
glyf_prime,
loca_prime);