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[subset] WIP implementation of serialize for cmap format 4.

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This commit is contained in:
Garret Rieger 2018-05-02 17:11:18 -07:00
parent cfa592d31c
commit 4195a52b04
1 changed files with 38 additions and 1 deletions
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39
src/hb-ot-cmap-table.hh
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@ -80,7 +80,44 @@ struct CmapSubtableFormat4
const hb_subset_plan_t *plan,
const hb_vector_t<segment_plan> &segments)
{
// TODO
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return_trace (false);
this->format.set (4);
this->length.set (get_sub_table_size (segments));
// 2 * segCount
this->segCountX2.set (segments.len * 2);
// 2 * (2**floor(log2(segCount)))
this->searchRangeZ.set (2 * (1 << (int) (log (segments.len) / log (2.0))));
// log2(searchRange/2)
this->entrySelectorZ.set (log ((double) this->searchRangeZ) / log (2.0));
// 2 x segCount - searchRange
this->rangeShiftZ.set (2 * segments.len - this->searchRangeZ);
HBUINT16 *end_count = c->allocate_size<HBUINT16> (HBUINT16::static_size * segments.len);
c->allocate_size<HBUINT16> (HBUINT16::static_size); // 2 bytes of padding.
HBUINT16 *start_count = c->allocate_size<HBUINT16> (HBUINT16::static_size * segments.len);
HBINT16 *id_delta = c->allocate_size<HBINT16> (HBUINT16::static_size * segments.len);
HBUINT16 *id_range_offset = c->allocate_size<HBUINT16> (HBUINT16::static_size * segments.len);
for (unsigned int i = 0; i < segments.len; i++)
{
end_count[i].set (segments[i].end_code);
start_count[i].set (segments[i].start_code);
if (segments[i].use_delta)
{
hb_codepoint_t start_gid;
if (unlikely (!hb_subset_plan_new_gid_for_codepoint (plan, segments[i].start_code, &start_gid)))
return false;
id_delta[i].set (start_gid - segments[i].start_code);
} else {
// TODO: fill out glyphIdArray and id_range_offset.
}
}
// TODO: glyphdIdArray
}
static inline size_t get_sub_table_size (const hb_vector_t<segment_plan> &segments)