commit cd4043da0dfd61da73473b2f00d5e3a78ad13bec
author Behdad Esfahbod <behdad@behdad.org> Fri Aug 04 12:22:42 2017 +0100
committer Behdad Esfahbod <behdad@behdad.org> Tue Sep 12 17:02:27 2017 -0400
tree 0b837c173909054be2415188c31dc1f5cb214f77
parent 028b91c781681be077066f1f1e86386f3106792f

Check for non-empty outline for U+0000..U+001F

See comment for reason.

src/fcfreetype.c

diff --git a/src/fcfreetype.c b/src/fcfreetype.c
index 7e37de5..c59f203 100644
--- a/src/fcfreetype.c
+++ b/src/fcfreetype.c
@@ -2229,6 +2229,18 @@
 	FT_Get_Advance (face, glyph, load_flags, advance);
     }
 
+    /* CID fonts built by Adobe used to make ASCII control chars to cid1
+     * (space glyph). As such, always check contour for those characters. */
+    if (ucs4 <= 0x001F)
+    {
+      if (FT_Load_Glyph (face, glyph, load_flags))
+	  return FcFalse;
+
+      if (face->glyph->format == FT_GLYPH_FORMAT_OUTLINE &&
+	  face->glyph->outline.n_contours == 0)
+	  return FcFalse;
+    }
+
     return FcTrue;
 }