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[subset] Add an implement for cmap format 4 create_sub_table_plan.

This commit is contained in:
Garret Rieger 2018-05-02 16:37:38 -07:00
parent 295d67ea7d
commit cfa592d31c
1 changed files with 42 additions and 1 deletions
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43
src/hb-ot-cmap-table.hh
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@ -108,7 +108,48 @@ struct CmapSubtableFormat4
static inline bool create_sub_table_plan (const hb_subset_plan_t *plan,
hb_vector_t<segment_plan> *segments)
{
// TODO
segment_plan *segment = nullptr;
hb_codepoint_t last_gid = 0;
for (unsigned int i = 0; i < plan->codepoints.len; i++) {
hb_codepoint_t cp = plan->codepoints[i];
hb_codepoint_t new_gid;
if (unlikely (!hb_subset_plan_new_gid_for_codepoint (plan, cp, &new_gid)))
{
DEBUG_MSG(SUBSET, nullptr, "Unable to find new gid for %04x", cp);
return false;
}
if (cp > 0xFFFF) {
// We are now outside of unicode BMP, stop adding to this cmap.
break;
}
if (!segment
|| cp != segment->end_code + 1)
{
segment = segments->push ();
segment->start_code.set (cp);
segment->end_code.set (cp);
segment->use_delta = true;
} else {
segment->end_code.set (cp);
if (last_gid + 1 != new_gid)
// gid's are not consecutive in this segment so delta
// cannot be used.
segment->use_delta = false;
}
// There must be a final entry with end_code == 0xFFFF. Check if we need to add one.
if (segment == nullptr || segment->end_code != 0xFFFF) {
segment = segments->push ();
segment->start_code.set (0xFFFF);
segment->end_code.set (0xFFFF);
segment->use_delta = true;
}
last_gid = new_gid;
}
return true;
}
struct accelerator_t