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from fontTools.ttLib.ttFont import TTFont
from fontTools.ttLib.sfnt import readTTCHeader, writeTTCHeader
from io import BytesIO
import struct
import logging
log = logging.getLogger(__name__)
class TTCollection(object):
"""Object representing a TrueType Collection / OpenType Collection.
The main API is self.fonts being a list of TTFont instances.
If shareTables is True, then different fonts in the collection
might point to the same table object if the data for the table was
the same in the font file. Note, however, that this might result
in suprises and incorrect behavior if the different fonts involved
have different GlyphOrder. Use only if you know what you are doing.
"""
def __init__(self, file=None, shareTables=False, **kwargs):
fonts = self.fonts = []
if file is None:
return
assert 'fontNumber' not in kwargs, kwargs
closeStream = False
if not hasattr(file, "read"):
file = open(file, "rb")
closeStream = True
tableCache = {} if shareTables else None
header = readTTCHeader(file)
for i in range(header.numFonts):
font = TTFont(file, fontNumber=i, _tableCache=tableCache, **kwargs)
fonts.append(font)
# don't close file if lazy=True, as the TTFont hold a reference to the original
# file; the file will be closed once the TTFonts are closed in the
# TTCollection.close(). We still want to close the file if lazy is None or
# False, because in that case the TTFont no longer need the original file
# and we want to avoid 'ResourceWarning: unclosed file'.
if not kwargs.get("lazy") and closeStream:
file.close()
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.close()
def close(self):
for font in self.fonts:
font.close()
def save(self, file, shareTables=True):
"""Save the font to disk. Similarly to the constructor,
the 'file' argument can be either a pathname or a writable
file object.
"""
if not hasattr(file, "write"):
final = None
file = open(file, "wb")
else:
# assume "file" is a writable file object
# write to a temporary stream to allow saving to unseekable streams
final = file
file = BytesIO()
tableCache = {} if shareTables else None
offsets_offset = writeTTCHeader(file, len(self.fonts))
offsets = []
for font in self.fonts:
offsets.append(file.tell())
font._save(file, tableCache=tableCache)
file.seek(0,2)
file.seek(offsets_offset)
file.write(struct.pack(">%dL" % len(self.fonts), *offsets))
if final:
final.write(file.getvalue())
file.close()
def saveXML(self, fileOrPath, newlinestr="\n", writeVersion=True, **kwargs):
from fontTools.misc import xmlWriter
writer = xmlWriter.XMLWriter(fileOrPath, newlinestr=newlinestr)
if writeVersion:
from fontTools import version
version = ".".join(version.split('.')[:2])
writer.begintag("ttCollection", ttLibVersion=version)
else:
writer.begintag("ttCollection")
writer.newline()
writer.newline()
for font in self.fonts:
font._saveXML(writer, writeVersion=False, **kwargs)
writer.newline()
writer.endtag("ttCollection")
writer.newline()
writer.close()
def __getitem__(self, item):
return self.fonts[item]
def __setitem__(self, item, value):
self.fonts[item] = value
def __delitem__(self, item):
return self.fonts[item]
def __len__(self):
return len(self.fonts)
def __iter__(self):
return iter(self.fonts)
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