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[subset] Switch to a non-log using implementation of caculating searchRangeZ, entrySelectorZ, and rangeShiftZ in cmap4.

This commit is contained in:
Garret Rieger 2018-05-03 13:00:19 -07:00
parent b0d7971be0
commit 95eb0f3baf
1 changed files with 5 additions and 7 deletions
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12
src/hb-ot-cmap-table.hh
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@ -87,14 +87,12 @@ struct CmapSubtableFormat4
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 / 2.0) / log (2.0));
// 2 x segCount - searchRange
this->rangeShiftZ.set (2 * segments.len - this->searchRangeZ);
this->entrySelectorZ.set (MAX (1u, _hb_bit_storage (segments.len)) - 1);
this->searchRangeZ.set (2 * (1u << this->entrySelectorZ));
this->rangeShiftZ.set (segments.len * 2 > this->searchRangeZ
? 2 * segments.len - this->searchRangeZ
: 0);
HBUINT16 *end_count = c->allocate_size<HBUINT16> (HBUINT16::static_size * segments.len);
c->allocate_size<HBUINT16> (HBUINT16::static_size); // 2 bytes of padding.