def test_update_head_table_flags_with_hdmx():
tt = TTFont(FILEPATH_HINTED_TTF)
assert (tt["head"].flags & (1 << 4)) != 0
remove_ltsh_table(tt)
response = update_head_table_flags(tt)
assert response is False
assert (tt["head"].flags & (1 << 4)) != 0
def run(argv: List[str]) -> None:
# instantiate pretty printer
pp = pprint.PrettyPrinter(indent=4)
# ===========================================================
# argparse command line argument definitions
# ===========================================================
parser = argparse.ArgumentParser(
description="A tool for the removal of TrueType instruction sets (hints) in fonts"
)
parser.add_argument(
"--version", action="version", version="dehinter v{}".format(__version__)
)
parser.add_argument("-o", "--out", help="out file path (dehinted font)")
parser.add_argument("--keep-cvar", help="keep cvar table", action="store_true")
parser.add_argument("--keep-cvt", help="keep cvt table", action="store_true")
parser.add_argument("--keep-fpgm", help="keep fpgm table", action="store_true")
parser.add_argument("--keep-hdmx", help="keep hdmx table", action="store_true")
parser.add_argument("--keep-ltsh", help="keep LTSH table", action="store_true")
parser.add_argument("--keep-prep", help="keep prep table", action="store_true")
parser.add_argument("--keep-ttfa", help="keep TTFA table", action="store_true")
parser.add_argument("--keep-vdmx", help="keep VDMX table", action="store_true")
parser.add_argument(
"--keep-glyf", help="do not modify glyf table", action="store_true"
)
parser.add_argument(
"--keep-gasp", help="do not modify gasp table", action="store_true"
)
parser.add_argument(
"--keep-maxp", help="do not modify maxp table", action="store_true"
)
parser.add_argument(
"--keep-head", help="do not modify head table", action="store_true"
)
parser.add_argument("INFILE", help="in file path (hinted font)")
args = parser.parse_args(argv)
# ===========================================================
# Command line logic
# ===========================================================
#
# Validations
# -----------
# (1) file path request is a file
if not filepath_exists(args.INFILE):
sys.stderr.write(
f"[!] Error: '{args.INFILE}' is not a valid file path.{os.linesep}"
)
sys.stderr.write(f"[!] Request canceled.{os.linesep}")
sys.exit(1)
# (2) the file is a ttf font file (based on the 4 byte file signature
if not is_truetype_font(args.INFILE):
sys.stderr.write(
f"[!] Error: '{args.INFILE}' does not appear to be a TrueType font "
f"file.{os.linesep}"
)
sys.stderr.write(f"[!] Request canceled.{os.linesep}")
sys.exit(1)
# (3) confirm that out path is not the same as in path
# This tool does not support writing dehinted files in place over hinted version
if args.INFILE == args.out:
sys.stderr.write(
f"[!] Error: You are attempting to overwrite the hinted file with the "
f"dehinted file. This is not supported. Please choose a different file "
f"path for the dehinted file.{os.linesep}"
)
sys.exit(1)
# Execution
# ---------
# (1) OpenType table removal
try:
tt = TTFont(args.INFILE)
except Exception as e:
sys.stderr.write(
f"[!] Error: Unable to create font object with '{args.INFILE}' -> {str(e)}"
)
sys.exit(1)
if is_variable_font(tt) and not args.keep_cvar:
if has_cvar_table(tt):
remove_cvar_table(tt)
if not has_cvar_table(tt):
print("[-] Removed cvar table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove cvar table from font{os.linesep}"
)
if not args.keep_cvt:
if has_cvt_table(tt):
remove_cvt_table(tt)
if not has_cvt_table(tt):
print("[-] Removed cvt table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove cvt table from font{os.linesep}"
)
if not args.keep_fpgm:
if has_fpgm_table(tt):
remove_fpgm_table(tt)
if not has_fpgm_table(tt):
print("[-] Removed fpgm table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove fpgm table from font{os.linesep}"
)
if not args.keep_hdmx:
if has_hdmx_table(tt):
remove_hdmx_table(tt)
if not has_hdmx_table(tt):
print("[-] Removed hdmx table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove hdmx table from font{os.linesep}"
)
if not args.keep_ltsh:
if has_ltsh_table(tt):
remove_ltsh_table(tt)
if not has_ltsh_table(tt):
print("[-] Removed LTSH table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove LTSH table from font{os.linesep}"
)
if not args.keep_prep:
if has_prep_table(tt):
remove_prep_table(tt)
if not has_prep_table(tt):
print("[-] Removed prep table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove prep table from font{os.linesep}"
)
if not args.keep_ttfa:
if has_ttfa_table(tt):
remove_ttfa_table(tt)
if not has_ttfa_table(tt):
print("[-] Removed TTFA table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove TTFA table from font{os.linesep}"
)
if not args.keep_vdmx:
if has_vdmx_table(tt):
remove_vdmx_table(tt)
if not has_vdmx_table(tt):
print("[-] Removed VDMX table")
else: # pragma: no cover
sys.stderr.write(
f"[!] Error: failed to remove VDMX table from font{os.linesep}"
)
# (2) Remove glyf table instruction set bytecode
if not args.keep_glyf:
number_glyfs_edited = remove_glyf_instructions(tt)
if number_glyfs_edited > 0:
print(
f"[-] Removed glyf table instruction bytecode from "
f"{number_glyfs_edited} glyphs"
)
# (3) Edit gasp table
if not args.keep_gasp:
if update_gasp_table(tt):
gasp_string = pp.pformat(tt["gasp"].__dict__)
print(f"[Δ] New gasp table values:{os.linesep} {gasp_string}")
# (4) Edit maxp table
if not args.keep_maxp:
if update_maxp_table(tt):
maxp_string = pp.pformat(tt["maxp"].__dict__)
print(f"[Δ] New maxp table values:{os.linesep} {maxp_string}")
# (5) Edit head table flags to clear bit 4
if not args.keep_head:
if update_head_table_flags(tt):
print("[Δ] Cleared bit 4 in head table flags")
# File write
# ----------
if args.out:
# validation performed above to prevent this file path definition from
# being the same as the in file path. Write in place over a hinted
# file is not supported
outpath = args.out
else:
outpath = get_default_out_path(args.INFILE)
try:
tt.save(outpath)
print(f"{os.linesep}[+] Saved dehinted font as '{outpath}'")
except Exception as e: # pragma: no cover
sys.stderr.write(
f"[!] Error: Unable to save dehinted font file: {str(e)}{os.linesep}"
)
# File size comparison
# --------------------
infile_size_tuple = get_filesize(args.INFILE)
outfile_size_tuple = get_filesize(
outpath
) # depends on outpath definition defined during file write
print(f"{os.linesep}[*] File sizes:")
print(f" {infile_size_tuple[0]}{infile_size_tuple[1]} (hinted)")
print(f" {outfile_size_tuple[0]}{outfile_size_tuple[1]} (dehinted)")
def test_update_head_table_flags_previously_cleared():
tt = TTFont(FILEPATH_HINTED_TTF_2)
assert (tt["head"].flags & (1 << 4)) == 0
response = update_head_table_flags(tt)
assert response is False
assert (tt["head"].flags & (1 << 4)) == 0
