woff2

class fontTools.ttLib.woff2.WOFF2Reader(*args, **kwargs)

Bases: SFNTReader

flavor = 'woff2'

reconstructTable(tag)

Reconstruct table named ‘tag’ from transformed data.

class fontTools.ttLib.woff2.WOFF2Writer(*args, **kwargs)

Bases: SFNTWriter

flavor = 'woff2'

close()

All tags must have been specified. Now write the table data and directory.

transformTable(tag)

Return transformed table data, or None if some pre-conditions aren’t met – in which case, the non-transformed table data will be used.

writeMasterChecksum()

Write checkSumAdjustment to the transformBuffer.

reordersTables()

fontTools.ttLib.woff2.getKnownTagIndex(tag)

Return index of ‘tag’ in woff2KnownTags list. Return 63 if not found.

class fontTools.ttLib.woff2.WOFF2DirectoryEntry

Bases: DirectoryEntry

fromFile(file)

fromString(data)

toString()

property transformVersion

Return bits 6-7 of table entry’s flags, which indicate the preprocessing transformation version number (between 0 and 3).

property transformed

Return True if the table has any transformation, else return False.

class fontTools.ttLib.woff2.WOFF2LocaTable(tag=None)

Bases: table__l_o_c_a

Same as parent class. The only difference is that it attempts to preserve the ‘indexFormat’ as encoded in the WOFF2 glyf table.

compile(ttFont)

class fontTools.ttLib.woff2.WOFF2GlyfTable(tag=None)

Bases: table__g_l_y_f

Decoder/Encoder for WOFF2 ‘glyf’ table transform.

subStreams = ('nContourStream', 'nPointsStream', 'flagStream', 'glyphStream', 'compositeStream', 'bboxStream', 'instructionStream')

reconstruct(data, ttFont)

Decompile transformed ‘glyf’ data.

transform(ttFont)

Return transformed ‘glyf’ data

class fontTools.ttLib.woff2.WOFF2HmtxTable(tag=None)

Bases: table__h_m_t_x

reconstruct(data, ttFont)

transform(ttFont)

class fontTools.ttLib.woff2.WOFF2FlavorData(reader=None, data=None, transformedTables=None)

Bases: WOFFFlavorData

Flavor = 'woff2'

fontTools.ttLib.woff2.unpackBase128(data)

Read one to five bytes from UIntBase128-encoded input string, and return a tuple containing the decoded integer plus any leftover data.

>>> unpackBase128(b'\x3f\x00\x00') == (63, b"\x00\x00")
True
>>> unpackBase128(b'\x8f\xff\xff\xff\x7f')[0] == 4294967295
True
>>> unpackBase128(b'\x80\x80\x3f')  
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TTLibError: UIntBase128 value must not start with leading zeros
>>> unpackBase128(b'\x8f\xff\xff\xff\xff\x7f')[0]  
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TTLibError: UIntBase128-encoded sequence is longer than 5 bytes
>>> unpackBase128(b'\x90\x80\x80\x80\x00')[0]  
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TTLibError: UIntBase128 value exceeds 2**32-1

fontTools.ttLib.woff2.base128Size(n)

Return the length in bytes of a UIntBase128-encoded sequence with value n.

>>> base128Size(0)
1
>>> base128Size(24567)
3
>>> base128Size(2**32-1)
5

fontTools.ttLib.woff2.packBase128(n)

Encode unsigned integer in range 0 to 2**32-1 (inclusive) to a string of bytes using UIntBase128 variable-length encoding. Produce the shortest possible encoding.

>>> packBase128(63) == b"\x3f"
True
>>> packBase128(2**32-1) == b'\x8f\xff\xff\xff\x7f'
True

fontTools.ttLib.woff2.unpack255UShort(data)

Read one to three bytes from 255UInt16-encoded input string, and return a tuple containing the decoded integer plus any leftover data.

>>> unpack255UShort(bytechr(252))[0]
252

Note that some numbers (e.g. 506) can have multiple encodings: >>> unpack255UShort(struct.pack(“BB”, 254, 0))[0] 506 >>> unpack255UShort(struct.pack(“BB”, 255, 253))[0] 506 >>> unpack255UShort(struct.pack(“BBB”, 253, 1, 250))[0] 506

fontTools.ttLib.woff2.pack255UShort(value)

Encode unsigned integer in range 0 to 65535 (inclusive) to a bytestring using 255UInt16 variable-length encoding.

>>> pack255UShort(252) == b'\xfc'
True
>>> pack255UShort(506) == b'\xfe\x00'
True
>>> pack255UShort(762) == b'\xfd\x02\xfa'
True

fontTools.ttLib.woff2.compress(input_file, output_file, transform_tables=None)

Compress OpenType font to WOFF2.

Parameters:

• input_file – a file path, file or file-like object (open in binary mode) containing an OpenType font (either CFF- or TrueType-flavored).

• output_file – a file path, file or file-like object where to save the compressed WOFF2 font.

• transform_tables – Optional[Iterable[str]]: a set of table tags for which to enable preprocessing transformations. By default, only ‘glyf’ and ‘loca’ tables are transformed. An empty set means disable all transformations.

fontTools.ttLib.woff2.decompress(input_file, output_file)

Decompress WOFF2 font to OpenType font.

Parameters:

• input_file – a file path, file or file-like object (open in binary mode) containing a compressed WOFF2 font.

• output_file – a file path, file or file-like object where to save the decompressed OpenType font.

fontTools.ttLib.woff2.main(args=None)

Compress and decompress WOFF2 fonts