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-rw-r--r--libass/ass_font.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/libass/ass_font.c b/libass/ass_font.c
index b93c41e1b1..c434da7ca6 100644
--- a/libass/ass_font.c
+++ b/libass/ass_font.c
@@ -204,8 +204,12 @@ static void face_set_size(FT_Face face, double size)
FT_Size_Metrics *m = &face->size->metrics;
// VSFilter uses metrics from TrueType OS/2 table
// The idea was borrowed from asa (http://asa.diac24.net)
- if (hori && os2)
- mscale = ((double)(hori->Ascender - hori->Descender)) / (os2->usWinAscent + os2->usWinDescent);
+ if (hori && os2) {
+ int hori_height = hori->Ascender - hori->Descender;
+ int os2_height = os2->usWinAscent + os2->usWinDescent;
+ if (hori_height && os2_height)
+ mscale = (double)hori_height / os2_height;
+ }
memset(&rq, 0, sizeof(rq));
rq.type = FT_SIZE_REQUEST_TYPE_REAL_DIM;
rq.width = 0;