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Round, not truncate, when scaling values 

Fixes https://github.com/behdad/harfbuzz/issues/255
This commit is contained in:
Behdad Esfahbod 2016-06-06 23:08:54 -07:00
parent a93078a0ec
commit 4b8de1ea80
1 changed files with 7 additions and 1 deletions
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8
src/hb-font-private.hh
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@ -505,7 +505,13 @@ struct hb_font_t {
}
private:
inline hb_position_t em_scale (int16_t v, int scale) { return (hb_position_t) (v * (int64_t) scale / face->get_upem ()); }
inline hb_position_t em_scale (int16_t v, int scale)
{
int upem = face->get_upem ();
int64_t scaled = v * (int64_t) scale;
scaled += scaled >= 0 ? upem/2 : -upem/2; /* Round. */
return (hb_position_t) (scaled / upem);
}
};
#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS