+string
+get_postscript_name (FT_Face face)
+{
+ string face_ps_name;
+ const char *psname = FT_Get_Postscript_Name (face);
+ if (psname)
+ face_ps_name = psname;
+ else
+ {
+ warning (_ ("cannot get postscript name"));
+ return "";
+ }
+
+ const char *fmt = FT_Get_Font_Format (face);
+ if (fmt)
+ {
+ if (static_cast<string>(fmt) != "CFF")
+ return face_ps_name; // For non-CFF font, pass it through.
+ }
+ else
+ {
+ warning (_f ("cannot get font %s format", face_ps_name.c_str ()));
+ return face_ps_name;
+ }
+
+ // For OTF and OTC fonts, we use data from the font's 'CFF' table only
+ // because other tables are not embedded in the output PS file.
+ string cff_table = get_otf_table (face, "CFF ");
+
+ FT_Open_Args args;
+ args.flags = FT_OPEN_MEMORY;
+ args.memory_base = static_cast<const FT_Byte*>
+ (static_cast<const void*>(cff_table.data ()));
+ args.memory_size = cff_table.size ();
+
+ FT_Face cff_face;
+ // According to OpenType Specification ver 1.7,
+ // the CFF (derived from OTF and OTC) has only one name.
+ // So we use zero as the font index.
+ FT_Error error_code = FT_Open_Face (freetype2_library, &args,
+ 0 /* font index */,
+ &cff_face);
+ if (error_code)
+ {
+ warning (_f ("cannot read CFF %s: %s",
+ face_ps_name,
+ freetype_error_string (error_code).c_str ()));
+ return face_ps_name;
+ }
+
+ string ret;
+ const char *cffname = FT_Get_Postscript_Name (cff_face);
+ if (cffname)
+ ret = cffname;
+ else
+ {
+ warning (_f ("cannot get font %s CFF name", face_ps_name.c_str ()));
+ ret = face_ps_name;
+ }
+
+ debug_output (_f ("Replace font name from %s to %s.",
+ face_ps_name.c_str (), ret.c_str ()));
+
+ FT_Done_Face (cff_face);
+
+ return ret;
+}
+