src/hb-font-private.hh | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
New commits:
commit 4b8de1ea804b225e8357422d0686aad76b05ccf3
Author: Behdad Esfahbod <beh...@behdad.org>
Date: Mon Jun 6 23:08:54 2016 -0700
Round, not truncate, when scaling values
Fixes https://github.com/behdad/harfbuzz/issues/255
diff --git a/src/hb-font-private.hh b/src/hb-font-private.hh
index 8da40a9..0b75577 100644
--- a/src/hb-font-private.hh
+++ b/src/hb-font-private.hh
@@ -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
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