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[ot] Implement cmap subtable format 4

This commit is contained in:
Behdad Esfahbod 2014-05-09 19:55:51 -04:00
parent 4719621f20
commit c8a4745299
1 changed files with 52 additions and 0 deletions
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52
src/hb-ot-cmap-table.hh
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@ -47,7 +47,59 @@ struct CmapSubtableFormat4
private:
inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
unsigned int segCount;
const USHORT *endCount;
const USHORT *startCount;
const USHORT *idDelta;
const USHORT *idRangeOffset;
const USHORT *glyphIdArray;
unsigned int glyphIdArrayLength;
segCount = this->segCountX2 / 2;
endCount = this->values;
startCount = endCount + segCount + 1;
idDelta = startCount + segCount;
idRangeOffset = idDelta + segCount;
glyphIdArray = idRangeOffset + segCount;
glyphIdArrayLength = (this->length - 16 - 8 * segCount) / 2;
/* Custom bsearch. */
int min = 0, max = (int) segCount - 1;
unsigned int i;
while (min <= max)
{
int mid = (min + max) / 2;
if (codepoint < startCount[mid])
max = mid - 1;
else if (codepoint > endCount[mid])
min = mid + 1;
else
{
i = mid;
goto found;
}
}
return false;
found:
hb_codepoint_t gid;
unsigned int rangeOffset = idRangeOffset[i];
if (rangeOffset == 0)
gid = codepoint + idDelta[i];
else
{
/* Somebody has been smoking... */
unsigned int index = rangeOffset / 2 + (codepoint - startCount[i]) + i - segCount;
if (unlikely (index >= glyphIdArrayLength))
return false;
gid = glyphIdArray[index];
if (unlikely (!gid))
return false;
gid += idDelta[i];
}
*glyph = gid & 0xFFFF;
return true;
}
inline bool sanitize (hb_sanitize_context_t *c) {