[sfnt] Prefer `CBDT'/`CBLC' over `glyf' table (#53154).

ChangeLog

@@ -1,3 +1,7 @@
+2018-02-17  Werner Lemberg  <wl@gnu.org>
+
+	[sfnt] Prefer `CBDT'/`CBLC' over `glyf' table (#53154).
+
 2018-02-06  Werner Lemberg  <wl@gnu.org>
 
 	[truetype] Integer overflow issues.

src/sfnt/sfobjs.c

@@ -1144,6 +1144,8 @@
     FT_Bool       has_outline;
     FT_Bool       is_apple_sbit;
     FT_Bool       is_apple_sbix;
+    FT_Bool       has_CBLC;
+    FT_Bool       has_CBDT;
     FT_Bool       ignore_typographic_family    = FALSE;
     FT_Bool       ignore_typographic_subfamily = FALSE;
 
@@ -1224,6 +1226,13 @@
         goto Exit;
     }
 
+    has_CBLC = !face->goto_table( face, TTAG_CBLC, stream, 0 );
+    has_CBDT = !face->goto_table( face, TTAG_CBDT, stream, 0 );
+
+    /* Ignore outlines for CBLC/CBDT fonts. */
+    if ( has_CBLC || has_CBDT )
+      has_outline = FALSE;
+
     /* OpenType 1.8.2 introduced limits to this value;    */
     /* however, they make sense for older SFNT fonts also */
     if ( face->header.Units_Per_EM <    16 ||