From 56c0babe3bd6941382072a5b8209236d801a4201 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Mon, 5 Oct 2015 14:12:20 +0200
Subject: Never squish a substitute font to zero width, in case of broken font
 metrics.

---
 source/fitz/font.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'source/fitz/font.c')

diff --git a/source/fitz/font.c b/source/fitz/font.c
index 5a1e61ff..d5296eb9 100644
--- a/source/fitz/font.c
+++ b/source/fitz/font.c
@@ -426,7 +426,8 @@ fz_adjust_ft_glyph_width(fz_context *ctx, fz_font *font, int gid, fz_matrix *trm
 		else
 			subw = font->width_default;
 
-		if (realw > 0)
+		/* Sanity check scaling in case of broken metrics. */
+		if (realw > 0 && subw > 0)
 			fz_pre_scale(trm, subw / realw, 1);
 	}
 
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