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