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1069 lines
33 KiB
1069 lines
33 KiB
from fontTools.misc import xmlWriter
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from fontTools.misc.py23 import Tag, byteord, tostr
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from fontTools.misc.loggingTools import deprecateArgument
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from fontTools.ttLib import TTLibError
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from fontTools.ttLib.sfnt import SFNTReader, SFNTWriter
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from io import BytesIO, StringIO
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import os
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import logging
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import traceback
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log = logging.getLogger(__name__)
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class TTFont(object):
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"""The main font object. It manages file input and output, and offers
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a convenient way of accessing tables.
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Tables will be only decompiled when necessary, ie. when they're actually
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accessed. This means that simple operations can be extremely fast.
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"""
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def __init__(self, file=None, res_name_or_index=None,
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sfntVersion="\000\001\000\000", flavor=None, checkChecksums=0,
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verbose=None, recalcBBoxes=True, allowVID=False, ignoreDecompileErrors=False,
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recalcTimestamp=True, fontNumber=-1, lazy=None, quiet=None,
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_tableCache=None):
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"""The constructor can be called with a few different arguments.
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When reading a font from disk, 'file' should be either a pathname
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pointing to a file, or a readable file object.
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It we're running on a Macintosh, 'res_name_or_index' maybe an sfnt
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resource name or an sfnt resource index number or zero. The latter
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case will cause TTLib to autodetect whether the file is a flat file
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or a suitcase. (If it's a suitcase, only the first 'sfnt' resource
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will be read!)
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The 'checkChecksums' argument is used to specify how sfnt
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checksums are treated upon reading a file from disk:
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0: don't check (default)
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1: check, print warnings if a wrong checksum is found
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2: check, raise an exception if a wrong checksum is found.
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The TTFont constructor can also be called without a 'file'
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argument: this is the way to create a new empty font.
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In this case you can optionally supply the 'sfntVersion' argument,
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and a 'flavor' which can be None, 'woff', or 'woff2'.
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If the recalcBBoxes argument is false, a number of things will *not*
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be recalculated upon save/compile:
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1) 'glyf' glyph bounding boxes
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2) 'CFF ' font bounding box
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3) 'head' font bounding box
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4) 'hhea' min/max values
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5) 'vhea' min/max values
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(1) is needed for certain kinds of CJK fonts (ask Werner Lemberg ;-).
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Additionally, upon importing an TTX file, this option cause glyphs
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to be compiled right away. This should reduce memory consumption
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greatly, and therefore should have some impact on the time needed
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to parse/compile large fonts.
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If the recalcTimestamp argument is false, the modified timestamp in the
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'head' table will *not* be recalculated upon save/compile.
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If the allowVID argument is set to true, then virtual GID's are
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supported. Asking for a glyph ID with a glyph name or GID that is not in
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the font will return a virtual GID. This is valid for GSUB and cmap
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tables. For SING glyphlets, the cmap table is used to specify Unicode
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values for virtual GI's used in GSUB/GPOS rules. If the gid N is requested
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and does not exist in the font, or the glyphname has the form glyphN
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and does not exist in the font, then N is used as the virtual GID.
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Else, the first virtual GID is assigned as 0x1000 -1; for subsequent new
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virtual GIDs, the next is one less than the previous.
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If ignoreDecompileErrors is set to True, exceptions raised in
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individual tables during decompilation will be ignored, falling
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back to the DefaultTable implementation, which simply keeps the
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binary data.
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If lazy is set to True, many data structures are loaded lazily, upon
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access only. If it is set to False, many data structures are loaded
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immediately. The default is lazy=None which is somewhere in between.
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"""
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for name in ("verbose", "quiet"):
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val = locals().get(name)
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if val is not None:
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deprecateArgument(name, "configure logging instead")
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setattr(self, name, val)
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self.lazy = lazy
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self.recalcBBoxes = recalcBBoxes
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self.recalcTimestamp = recalcTimestamp
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self.tables = {}
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self.reader = None
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# Permit the user to reference glyphs that are not int the font.
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self.last_vid = 0xFFFE # Can't make it be 0xFFFF, as the world is full unsigned short integer counters that get incremented after the last seen GID value.
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self.reverseVIDDict = {}
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self.VIDDict = {}
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self.allowVID = allowVID
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self.ignoreDecompileErrors = ignoreDecompileErrors
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if not file:
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self.sfntVersion = sfntVersion
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self.flavor = flavor
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self.flavorData = None
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return
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if not hasattr(file, "read"):
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closeStream = True
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# assume file is a string
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if res_name_or_index is not None:
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# see if it contains 'sfnt' resources in the resource or data fork
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from . import macUtils
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if res_name_or_index == 0:
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if macUtils.getSFNTResIndices(file):
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# get the first available sfnt font.
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file = macUtils.SFNTResourceReader(file, 1)
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else:
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file = open(file, "rb")
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else:
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file = macUtils.SFNTResourceReader(file, res_name_or_index)
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else:
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file = open(file, "rb")
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else:
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# assume "file" is a readable file object
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closeStream = False
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file.seek(0)
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if not self.lazy:
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# read input file in memory and wrap a stream around it to allow overwriting
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file.seek(0)
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tmp = BytesIO(file.read())
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if hasattr(file, 'name'):
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# save reference to input file name
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tmp.name = file.name
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if closeStream:
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file.close()
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file = tmp
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self._tableCache = _tableCache
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self.reader = SFNTReader(file, checkChecksums, fontNumber=fontNumber)
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self.sfntVersion = self.reader.sfntVersion
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self.flavor = self.reader.flavor
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self.flavorData = self.reader.flavorData
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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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"""If we still have a reader object, close it."""
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if self.reader is not None:
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self.reader.close()
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def save(self, file, reorderTables=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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if self.lazy and self.reader.file.name == file:
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raise TTLibError(
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"Can't overwrite TTFont when 'lazy' attribute is True")
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createStream = True
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else:
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# assume "file" is a writable file object
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createStream = False
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tmp = BytesIO()
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writer_reordersTables = self._save(tmp)
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if not (reorderTables is None or writer_reordersTables or
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(reorderTables is False and self.reader is None)):
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if reorderTables is False:
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# sort tables using the original font's order
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tableOrder = list(self.reader.keys())
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else:
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# use the recommended order from the OpenType specification
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tableOrder = None
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tmp.flush()
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tmp2 = BytesIO()
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reorderFontTables(tmp, tmp2, tableOrder)
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tmp.close()
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tmp = tmp2
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if createStream:
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# "file" is a path
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with open(file, "wb") as file:
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file.write(tmp.getvalue())
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else:
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file.write(tmp.getvalue())
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tmp.close()
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def _save(self, file, tableCache=None):
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"""Internal function, to be shared by save() and TTCollection.save()"""
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if self.recalcTimestamp and 'head' in self:
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self['head'] # make sure 'head' is loaded so the recalculation is actually done
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tags = list(self.keys())
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if "GlyphOrder" in tags:
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tags.remove("GlyphOrder")
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numTables = len(tags)
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# write to a temporary stream to allow saving to unseekable streams
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writer = SFNTWriter(file, numTables, self.sfntVersion, self.flavor, self.flavorData)
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done = []
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for tag in tags:
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self._writeTable(tag, writer, done, tableCache)
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writer.close()
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return writer.reordersTables()
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def saveXML(self, fileOrPath, newlinestr=None, **kwargs):
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"""Export the font as TTX (an XML-based text file), or as a series of text
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files when splitTables is true. In the latter case, the 'fileOrPath'
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argument should be a path to a directory.
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The 'tables' argument must either be false (dump all tables) or a
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list of tables to dump. The 'skipTables' argument may be a list of tables
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to skip, but only when the 'tables' argument is false.
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"""
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writer = xmlWriter.XMLWriter(fileOrPath, newlinestr=newlinestr)
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self._saveXML(writer, **kwargs)
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writer.close()
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def _saveXML(self, writer,
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writeVersion=True,
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quiet=None, tables=None, skipTables=None, splitTables=False,
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splitGlyphs=False, disassembleInstructions=True,
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bitmapGlyphDataFormat='raw'):
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if quiet is not None:
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deprecateArgument("quiet", "configure logging instead")
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self.disassembleInstructions = disassembleInstructions
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self.bitmapGlyphDataFormat = bitmapGlyphDataFormat
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if not tables:
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tables = list(self.keys())
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if "GlyphOrder" not in tables:
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tables = ["GlyphOrder"] + tables
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if skipTables:
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for tag in skipTables:
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if tag in tables:
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tables.remove(tag)
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numTables = len(tables)
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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("ttFont", sfntVersion=repr(tostr(self.sfntVersion))[1:-1],
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ttLibVersion=version)
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else:
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writer.begintag("ttFont", sfntVersion=repr(tostr(self.sfntVersion))[1:-1])
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writer.newline()
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# always splitTables if splitGlyphs is enabled
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splitTables = splitTables or splitGlyphs
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if not splitTables:
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writer.newline()
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else:
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path, ext = os.path.splitext(writer.filename)
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fileNameTemplate = path + ".%s" + ext
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for i in range(numTables):
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tag = tables[i]
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if splitTables:
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tablePath = fileNameTemplate % tagToIdentifier(tag)
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tableWriter = xmlWriter.XMLWriter(tablePath,
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newlinestr=writer.newlinestr)
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tableWriter.begintag("ttFont", ttLibVersion=version)
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tableWriter.newline()
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tableWriter.newline()
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writer.simpletag(tagToXML(tag), src=os.path.basename(tablePath))
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writer.newline()
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else:
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tableWriter = writer
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self._tableToXML(tableWriter, tag, splitGlyphs=splitGlyphs)
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if splitTables:
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tableWriter.endtag("ttFont")
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tableWriter.newline()
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tableWriter.close()
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writer.endtag("ttFont")
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writer.newline()
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def _tableToXML(self, writer, tag, quiet=None, splitGlyphs=False):
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if quiet is not None:
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deprecateArgument("quiet", "configure logging instead")
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if tag in self:
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table = self[tag]
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report = "Dumping '%s' table..." % tag
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else:
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report = "No '%s' table found." % tag
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log.info(report)
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if tag not in self:
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return
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xmlTag = tagToXML(tag)
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attrs = dict()
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if hasattr(table, "ERROR"):
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attrs['ERROR'] = "decompilation error"
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from .tables.DefaultTable import DefaultTable
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if table.__class__ == DefaultTable:
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attrs['raw'] = True
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writer.begintag(xmlTag, **attrs)
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writer.newline()
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if tag == "glyf":
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table.toXML(writer, self, splitGlyphs=splitGlyphs)
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else:
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table.toXML(writer, self)
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writer.endtag(xmlTag)
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writer.newline()
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writer.newline()
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def importXML(self, fileOrPath, quiet=None):
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"""Import a TTX file (an XML-based text format), so as to recreate
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a font object.
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"""
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if quiet is not None:
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deprecateArgument("quiet", "configure logging instead")
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if "maxp" in self and "post" in self:
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# Make sure the glyph order is loaded, as it otherwise gets
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# lost if the XML doesn't contain the glyph order, yet does
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# contain the table which was originally used to extract the
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# glyph names from (ie. 'post', 'cmap' or 'CFF ').
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self.getGlyphOrder()
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from fontTools.misc import xmlReader
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reader = xmlReader.XMLReader(fileOrPath, self)
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reader.read()
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def isLoaded(self, tag):
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"""Return true if the table identified by 'tag' has been
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decompiled and loaded into memory."""
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return tag in self.tables
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def has_key(self, tag):
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if self.isLoaded(tag):
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return True
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elif self.reader and tag in self.reader:
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return True
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elif tag == "GlyphOrder":
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return True
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else:
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return False
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__contains__ = has_key
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def keys(self):
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keys = list(self.tables.keys())
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if self.reader:
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for key in list(self.reader.keys()):
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if key not in keys:
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keys.append(key)
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if "GlyphOrder" in keys:
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keys.remove("GlyphOrder")
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keys = sortedTagList(keys)
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return ["GlyphOrder"] + keys
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def __len__(self):
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return len(list(self.keys()))
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def __getitem__(self, tag):
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tag = Tag(tag)
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table = self.tables.get(tag)
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if table is None:
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if tag == "GlyphOrder":
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table = GlyphOrder(tag)
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self.tables[tag] = table
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elif self.reader is not None:
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table = self._readTable(tag)
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else:
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raise KeyError("'%s' table not found" % tag)
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return table
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def _readTable(self, tag):
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log.debug("Reading '%s' table from disk", tag)
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data = self.reader[tag]
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if self._tableCache is not None:
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table = self._tableCache.get((tag, data))
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if table is not None:
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return table
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tableClass = getTableClass(tag)
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table = tableClass(tag)
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self.tables[tag] = table
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log.debug("Decompiling '%s' table", tag)
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try:
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table.decompile(data, self)
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except Exception:
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if not self.ignoreDecompileErrors:
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raise
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# fall back to DefaultTable, retaining the binary table data
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log.exception(
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"An exception occurred during the decompilation of the '%s' table", tag)
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from .tables.DefaultTable import DefaultTable
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file = StringIO()
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traceback.print_exc(file=file)
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table = DefaultTable(tag)
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table.ERROR = file.getvalue()
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self.tables[tag] = table
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table.decompile(data, self)
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if self._tableCache is not None:
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self._tableCache[(tag, data)] = table
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return table
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def __setitem__(self, tag, table):
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self.tables[Tag(tag)] = table
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def __delitem__(self, tag):
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if tag not in self:
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raise KeyError("'%s' table not found" % tag)
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if tag in self.tables:
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del self.tables[tag]
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if self.reader and tag in self.reader:
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del self.reader[tag]
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def get(self, tag, default=None):
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try:
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return self[tag]
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except KeyError:
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return default
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|
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def setGlyphOrder(self, glyphOrder):
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self.glyphOrder = glyphOrder
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def getGlyphOrder(self):
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try:
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return self.glyphOrder
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except AttributeError:
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pass
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if 'CFF ' in self:
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cff = self['CFF ']
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self.glyphOrder = cff.getGlyphOrder()
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elif 'post' in self:
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# TrueType font
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glyphOrder = self['post'].getGlyphOrder()
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if glyphOrder is None:
|
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#
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# No names found in the 'post' table.
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# Try to create glyph names from the unicode cmap (if available)
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# in combination with the Adobe Glyph List (AGL).
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#
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self._getGlyphNamesFromCmap()
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else:
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self.glyphOrder = glyphOrder
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else:
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self._getGlyphNamesFromCmap()
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return self.glyphOrder
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|
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def _getGlyphNamesFromCmap(self):
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#
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# This is rather convoluted, but then again, it's an interesting problem:
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# - we need to use the unicode values found in the cmap table to
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# build glyph names (eg. because there is only a minimal post table,
|
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# or none at all).
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|
# - but the cmap parser also needs glyph names to work with...
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|
# So here's what we do:
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# - make up glyph names based on glyphID
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# - load a temporary cmap table based on those names
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# - extract the unicode values, build the "real" glyph names
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|
# - unload the temporary cmap table
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#
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|
if self.isLoaded("cmap"):
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# Bootstrapping: we're getting called by the cmap parser
|
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# itself. This means self.tables['cmap'] contains a partially
|
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# loaded cmap, making it impossible to get at a unicode
|
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# subtable here. We remove the partially loaded cmap and
|
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# restore it later.
|
|
# This only happens if the cmap table is loaded before any
|
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# other table that does f.getGlyphOrder() or f.getGlyphName().
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cmapLoading = self.tables['cmap']
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del self.tables['cmap']
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else:
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cmapLoading = None
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|
# Make up glyph names based on glyphID, which will be used by the
|
|
# temporary cmap and by the real cmap in case we don't find a unicode
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# cmap.
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|
numGlyphs = int(self['maxp'].numGlyphs)
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glyphOrder = [None] * numGlyphs
|
|
glyphOrder[0] = ".notdef"
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|
for i in range(1, numGlyphs):
|
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glyphOrder[i] = "glyph%.5d" % i
|
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# Set the glyph order, so the cmap parser has something
|
|
# to work with (so we don't get called recursively).
|
|
self.glyphOrder = glyphOrder
|
|
|
|
# Make up glyph names based on the reversed cmap table. Because some
|
|
# glyphs (eg. ligatures or alternates) may not be reachable via cmap,
|
|
# this naming table will usually not cover all glyphs in the font.
|
|
# If the font has no Unicode cmap table, reversecmap will be empty.
|
|
if 'cmap' in self:
|
|
reversecmap = self['cmap'].buildReversed()
|
|
else:
|
|
reversecmap = {}
|
|
useCount = {}
|
|
for i in range(numGlyphs):
|
|
tempName = glyphOrder[i]
|
|
if tempName in reversecmap:
|
|
# If a font maps both U+0041 LATIN CAPITAL LETTER A and
|
|
# U+0391 GREEK CAPITAL LETTER ALPHA to the same glyph,
|
|
# we prefer naming the glyph as "A".
|
|
glyphName = self._makeGlyphName(min(reversecmap[tempName]))
|
|
numUses = useCount[glyphName] = useCount.get(glyphName, 0) + 1
|
|
if numUses > 1:
|
|
glyphName = "%s.alt%d" % (glyphName, numUses - 1)
|
|
glyphOrder[i] = glyphName
|
|
|
|
if 'cmap' in self:
|
|
# Delete the temporary cmap table from the cache, so it can
|
|
# be parsed again with the right names.
|
|
del self.tables['cmap']
|
|
self.glyphOrder = glyphOrder
|
|
if cmapLoading:
|
|
# restore partially loaded cmap, so it can continue loading
|
|
# using the proper names.
|
|
self.tables['cmap'] = cmapLoading
|
|
|
|
@staticmethod
|
|
def _makeGlyphName(codepoint):
|
|
from fontTools import agl # Adobe Glyph List
|
|
if codepoint in agl.UV2AGL:
|
|
return agl.UV2AGL[codepoint]
|
|
elif codepoint <= 0xFFFF:
|
|
return "uni%04X" % codepoint
|
|
else:
|
|
return "u%X" % codepoint
|
|
|
|
def getGlyphNames(self):
|
|
"""Get a list of glyph names, sorted alphabetically."""
|
|
glyphNames = sorted(self.getGlyphOrder())
|
|
return glyphNames
|
|
|
|
def getGlyphNames2(self):
|
|
"""Get a list of glyph names, sorted alphabetically,
|
|
but not case sensitive.
|
|
"""
|
|
from fontTools.misc import textTools
|
|
return textTools.caselessSort(self.getGlyphOrder())
|
|
|
|
def getGlyphName(self, glyphID, requireReal=False):
|
|
try:
|
|
return self.getGlyphOrder()[glyphID]
|
|
except IndexError:
|
|
if requireReal or not self.allowVID:
|
|
# XXX The ??.W8.otf font that ships with OSX uses higher glyphIDs in
|
|
# the cmap table than there are glyphs. I don't think it's legal...
|
|
return "glyph%.5d" % glyphID
|
|
else:
|
|
# user intends virtual GID support
|
|
try:
|
|
glyphName = self.VIDDict[glyphID]
|
|
except KeyError:
|
|
glyphName ="glyph%.5d" % glyphID
|
|
self.last_vid = min(glyphID, self.last_vid )
|
|
self.reverseVIDDict[glyphName] = glyphID
|
|
self.VIDDict[glyphID] = glyphName
|
|
return glyphName
|
|
|
|
def getGlyphID(self, glyphName, requireReal=False):
|
|
if not hasattr(self, "_reverseGlyphOrderDict"):
|
|
self._buildReverseGlyphOrderDict()
|
|
glyphOrder = self.getGlyphOrder()
|
|
d = self._reverseGlyphOrderDict
|
|
if glyphName not in d:
|
|
if glyphName in glyphOrder:
|
|
self._buildReverseGlyphOrderDict()
|
|
return self.getGlyphID(glyphName)
|
|
else:
|
|
if requireReal:
|
|
raise KeyError(glyphName)
|
|
elif not self.allowVID:
|
|
# Handle glyphXXX only
|
|
if glyphName[:5] == "glyph":
|
|
try:
|
|
return int(glyphName[5:])
|
|
except (NameError, ValueError):
|
|
raise KeyError(glyphName)
|
|
else:
|
|
# user intends virtual GID support
|
|
try:
|
|
glyphID = self.reverseVIDDict[glyphName]
|
|
except KeyError:
|
|
# if name is in glyphXXX format, use the specified name.
|
|
if glyphName[:5] == "glyph":
|
|
try:
|
|
glyphID = int(glyphName[5:])
|
|
except (NameError, ValueError):
|
|
glyphID = None
|
|
if glyphID is None:
|
|
glyphID = self.last_vid -1
|
|
self.last_vid = glyphID
|
|
self.reverseVIDDict[glyphName] = glyphID
|
|
self.VIDDict[glyphID] = glyphName
|
|
return glyphID
|
|
|
|
glyphID = d[glyphName]
|
|
if glyphName != glyphOrder[glyphID]:
|
|
self._buildReverseGlyphOrderDict()
|
|
return self.getGlyphID(glyphName)
|
|
return glyphID
|
|
|
|
def getReverseGlyphMap(self, rebuild=False):
|
|
if rebuild or not hasattr(self, "_reverseGlyphOrderDict"):
|
|
self._buildReverseGlyphOrderDict()
|
|
return self._reverseGlyphOrderDict
|
|
|
|
def _buildReverseGlyphOrderDict(self):
|
|
self._reverseGlyphOrderDict = d = {}
|
|
glyphOrder = self.getGlyphOrder()
|
|
for glyphID in range(len(glyphOrder)):
|
|
d[glyphOrder[glyphID]] = glyphID
|
|
|
|
def _writeTable(self, tag, writer, done, tableCache=None):
|
|
"""Internal helper function for self.save(). Keeps track of
|
|
inter-table dependencies.
|
|
"""
|
|
if tag in done:
|
|
return
|
|
tableClass = getTableClass(tag)
|
|
for masterTable in tableClass.dependencies:
|
|
if masterTable not in done:
|
|
if masterTable in self:
|
|
self._writeTable(masterTable, writer, done, tableCache)
|
|
else:
|
|
done.append(masterTable)
|
|
done.append(tag)
|
|
tabledata = self.getTableData(tag)
|
|
if tableCache is not None:
|
|
entry = tableCache.get((Tag(tag), tabledata))
|
|
if entry is not None:
|
|
log.debug("reusing '%s' table", tag)
|
|
writer.setEntry(tag, entry)
|
|
return
|
|
log.debug("Writing '%s' table to disk", tag)
|
|
writer[tag] = tabledata
|
|
if tableCache is not None:
|
|
tableCache[(Tag(tag), tabledata)] = writer[tag]
|
|
|
|
def getTableData(self, tag):
|
|
"""Returns raw table data, whether compiled or directly read from disk.
|
|
"""
|
|
tag = Tag(tag)
|
|
if self.isLoaded(tag):
|
|
log.debug("Compiling '%s' table", tag)
|
|
return self.tables[tag].compile(self)
|
|
elif self.reader and tag in self.reader:
|
|
log.debug("Reading '%s' table from disk", tag)
|
|
return self.reader[tag]
|
|
else:
|
|
raise KeyError(tag)
|
|
|
|
def getGlyphSet(self, preferCFF=True):
|
|
"""Return a generic GlyphSet, which is a dict-like object
|
|
mapping glyph names to glyph objects. The returned glyph objects
|
|
have a .draw() method that supports the Pen protocol, and will
|
|
have an attribute named 'width'.
|
|
|
|
If the font is CFF-based, the outlines will be taken from the 'CFF ' or
|
|
'CFF2' tables. Otherwise the outlines will be taken from the 'glyf' table.
|
|
If the font contains both a 'CFF '/'CFF2' and a 'glyf' table, you can use
|
|
the 'preferCFF' argument to specify which one should be taken. If the
|
|
font contains both a 'CFF ' and a 'CFF2' table, the latter is taken.
|
|
"""
|
|
glyphs = None
|
|
if (preferCFF and any(tb in self for tb in ["CFF ", "CFF2"]) or
|
|
("glyf" not in self and any(tb in self for tb in ["CFF ", "CFF2"]))):
|
|
table_tag = "CFF2" if "CFF2" in self else "CFF "
|
|
glyphs = _TTGlyphSet(self,
|
|
list(self[table_tag].cff.values())[0].CharStrings, _TTGlyphCFF)
|
|
|
|
if glyphs is None and "glyf" in self:
|
|
glyphs = _TTGlyphSet(self, self["glyf"], _TTGlyphGlyf)
|
|
|
|
if glyphs is None:
|
|
raise TTLibError("Font contains no outlines")
|
|
|
|
return glyphs
|
|
|
|
def getBestCmap(self, cmapPreferences=((3, 10), (0, 6), (0, 4), (3, 1), (0, 3), (0, 2), (0, 1), (0, 0))):
|
|
"""Return the 'best' unicode cmap dictionary available in the font,
|
|
or None, if no unicode cmap subtable is available.
|
|
|
|
By default it will search for the following (platformID, platEncID)
|
|
pairs:
|
|
(3, 10), (0, 6), (0, 4), (3, 1), (0, 3), (0, 2), (0, 1), (0, 0)
|
|
This can be customized via the cmapPreferences argument.
|
|
"""
|
|
return self["cmap"].getBestCmap(cmapPreferences=cmapPreferences)
|
|
|
|
|
|
class _TTGlyphSet(object):
|
|
|
|
"""Generic dict-like GlyphSet class that pulls metrics from hmtx and
|
|
glyph shape from TrueType or CFF.
|
|
"""
|
|
|
|
def __init__(self, ttFont, glyphs, glyphType):
|
|
"""Construct a new glyphset.
|
|
|
|
Args:
|
|
font (TTFont): The font object (used to get metrics).
|
|
glyphs (dict): A dictionary mapping glyph names to ``_TTGlyph`` objects.
|
|
glyphType (class): Either ``_TTGlyphCFF`` or ``_TTGlyphGlyf``.
|
|
"""
|
|
self._glyphs = glyphs
|
|
self._hmtx = ttFont['hmtx']
|
|
self._vmtx = ttFont['vmtx'] if 'vmtx' in ttFont else None
|
|
self._glyphType = glyphType
|
|
|
|
def keys(self):
|
|
return list(self._glyphs.keys())
|
|
|
|
def has_key(self, glyphName):
|
|
return glyphName in self._glyphs
|
|
|
|
__contains__ = has_key
|
|
|
|
def __getitem__(self, glyphName):
|
|
horizontalMetrics = self._hmtx[glyphName]
|
|
verticalMetrics = self._vmtx[glyphName] if self._vmtx else None
|
|
return self._glyphType(
|
|
self, self._glyphs[glyphName], horizontalMetrics, verticalMetrics)
|
|
|
|
def __len__(self):
|
|
return len(self._glyphs)
|
|
|
|
def get(self, glyphName, default=None):
|
|
try:
|
|
return self[glyphName]
|
|
except KeyError:
|
|
return default
|
|
|
|
class _TTGlyph(object):
|
|
|
|
"""Wrapper for a TrueType glyph that supports the Pen protocol, meaning
|
|
that it has .draw() and .drawPoints() methods that take a pen object as
|
|
their only argument. Additionally there are 'width' and 'lsb' attributes,
|
|
read from the 'hmtx' table.
|
|
|
|
If the font contains a 'vmtx' table, there will also be 'height' and 'tsb'
|
|
attributes.
|
|
"""
|
|
|
|
def __init__(self, glyphset, glyph, horizontalMetrics, verticalMetrics=None):
|
|
"""Construct a new _TTGlyph.
|
|
|
|
Args:
|
|
glyphset (_TTGlyphSet): A glyphset object used to resolve components.
|
|
glyph (ttLib.tables._g_l_y_f.Glyph): The glyph object.
|
|
horizontalMetrics (int, int): The glyph's width and left sidebearing.
|
|
"""
|
|
self._glyphset = glyphset
|
|
self._glyph = glyph
|
|
self.width, self.lsb = horizontalMetrics
|
|
if verticalMetrics:
|
|
self.height, self.tsb = verticalMetrics
|
|
else:
|
|
self.height, self.tsb = None, None
|
|
|
|
def draw(self, pen):
|
|
"""Draw the glyph onto ``pen``. See fontTools.pens.basePen for details
|
|
how that works.
|
|
"""
|
|
self._glyph.draw(pen)
|
|
|
|
def drawPoints(self, pen):
|
|
# drawPoints is only implemented for _TTGlyphGlyf at this time.
|
|
raise NotImplementedError()
|
|
|
|
class _TTGlyphCFF(_TTGlyph):
|
|
pass
|
|
|
|
class _TTGlyphGlyf(_TTGlyph):
|
|
|
|
def draw(self, pen):
|
|
"""Draw the glyph onto Pen. See fontTools.pens.basePen for details
|
|
how that works.
|
|
"""
|
|
glyfTable = self._glyphset._glyphs
|
|
glyph = self._glyph
|
|
offset = self.lsb - glyph.xMin if hasattr(glyph, "xMin") else 0
|
|
glyph.draw(pen, glyfTable, offset)
|
|
|
|
def drawPoints(self, pen):
|
|
"""Draw the glyph onto PointPen. See fontTools.pens.pointPen
|
|
for details how that works.
|
|
"""
|
|
glyfTable = self._glyphset._glyphs
|
|
glyph = self._glyph
|
|
offset = self.lsb - glyph.xMin if hasattr(glyph, "xMin") else 0
|
|
glyph.drawPoints(pen, glyfTable, offset)
|
|
|
|
|
|
class GlyphOrder(object):
|
|
|
|
"""A pseudo table. The glyph order isn't in the font as a separate
|
|
table, but it's nice to present it as such in the TTX format.
|
|
"""
|
|
|
|
def __init__(self, tag=None):
|
|
pass
|
|
|
|
def toXML(self, writer, ttFont):
|
|
glyphOrder = ttFont.getGlyphOrder()
|
|
writer.comment("The 'id' attribute is only for humans; "
|
|
"it is ignored when parsed.")
|
|
writer.newline()
|
|
for i in range(len(glyphOrder)):
|
|
glyphName = glyphOrder[i]
|
|
writer.simpletag("GlyphID", id=i, name=glyphName)
|
|
writer.newline()
|
|
|
|
def fromXML(self, name, attrs, content, ttFont):
|
|
if not hasattr(self, "glyphOrder"):
|
|
self.glyphOrder = []
|
|
ttFont.setGlyphOrder(self.glyphOrder)
|
|
if name == "GlyphID":
|
|
self.glyphOrder.append(attrs["name"])
|
|
|
|
|
|
def getTableModule(tag):
|
|
"""Fetch the packer/unpacker module for a table.
|
|
Return None when no module is found.
|
|
"""
|
|
from . import tables
|
|
pyTag = tagToIdentifier(tag)
|
|
try:
|
|
__import__("fontTools.ttLib.tables." + pyTag)
|
|
except ImportError as err:
|
|
# If pyTag is found in the ImportError message,
|
|
# means table is not implemented. If it's not
|
|
# there, then some other module is missing, don't
|
|
# suppress the error.
|
|
if str(err).find(pyTag) >= 0:
|
|
return None
|
|
else:
|
|
raise err
|
|
else:
|
|
return getattr(tables, pyTag)
|
|
|
|
|
|
# Registry for custom table packer/unpacker classes. Keys are table
|
|
# tags, values are (moduleName, className) tuples.
|
|
# See registerCustomTableClass() and getCustomTableClass()
|
|
_customTableRegistry = {}
|
|
|
|
|
|
def registerCustomTableClass(tag, moduleName, className=None):
|
|
"""Register a custom packer/unpacker class for a table.
|
|
The 'moduleName' must be an importable module. If no 'className'
|
|
is given, it is derived from the tag, for example it will be
|
|
table_C_U_S_T_ for a 'CUST' tag.
|
|
|
|
The registered table class should be a subclass of
|
|
fontTools.ttLib.tables.DefaultTable.DefaultTable
|
|
"""
|
|
if className is None:
|
|
className = "table_" + tagToIdentifier(tag)
|
|
_customTableRegistry[tag] = (moduleName, className)
|
|
|
|
|
|
def unregisterCustomTableClass(tag):
|
|
"""Unregister the custom packer/unpacker class for a table."""
|
|
del _customTableRegistry[tag]
|
|
|
|
|
|
def getCustomTableClass(tag):
|
|
"""Return the custom table class for tag, if one has been registered
|
|
with 'registerCustomTableClass()'. Else return None.
|
|
"""
|
|
if tag not in _customTableRegistry:
|
|
return None
|
|
import importlib
|
|
moduleName, className = _customTableRegistry[tag]
|
|
module = importlib.import_module(moduleName)
|
|
return getattr(module, className)
|
|
|
|
|
|
def getTableClass(tag):
|
|
"""Fetch the packer/unpacker class for a table."""
|
|
tableClass = getCustomTableClass(tag)
|
|
if tableClass is not None:
|
|
return tableClass
|
|
module = getTableModule(tag)
|
|
if module is None:
|
|
from .tables.DefaultTable import DefaultTable
|
|
return DefaultTable
|
|
pyTag = tagToIdentifier(tag)
|
|
tableClass = getattr(module, "table_" + pyTag)
|
|
return tableClass
|
|
|
|
|
|
def getClassTag(klass):
|
|
"""Fetch the table tag for a class object."""
|
|
name = klass.__name__
|
|
assert name[:6] == 'table_'
|
|
name = name[6:] # Chop 'table_'
|
|
return identifierToTag(name)
|
|
|
|
|
|
def newTable(tag):
|
|
"""Return a new instance of a table."""
|
|
tableClass = getTableClass(tag)
|
|
return tableClass(tag)
|
|
|
|
|
|
def _escapechar(c):
|
|
"""Helper function for tagToIdentifier()"""
|
|
import re
|
|
if re.match("[a-z0-9]", c):
|
|
return "_" + c
|
|
elif re.match("[A-Z]", c):
|
|
return c + "_"
|
|
else:
|
|
return hex(byteord(c))[2:]
|
|
|
|
|
|
def tagToIdentifier(tag):
|
|
"""Convert a table tag to a valid (but UGLY) python identifier,
|
|
as well as a filename that's guaranteed to be unique even on a
|
|
caseless file system. Each character is mapped to two characters.
|
|
Lowercase letters get an underscore before the letter, uppercase
|
|
letters get an underscore after the letter. Trailing spaces are
|
|
trimmed. Illegal characters are escaped as two hex bytes. If the
|
|
result starts with a number (as the result of a hex escape), an
|
|
extra underscore is prepended. Examples:
|
|
'glyf' -> '_g_l_y_f'
|
|
'cvt ' -> '_c_v_t'
|
|
'OS/2' -> 'O_S_2f_2'
|
|
"""
|
|
import re
|
|
tag = Tag(tag)
|
|
if tag == "GlyphOrder":
|
|
return tag
|
|
assert len(tag) == 4, "tag should be 4 characters long"
|
|
while len(tag) > 1 and tag[-1] == ' ':
|
|
tag = tag[:-1]
|
|
ident = ""
|
|
for c in tag:
|
|
ident = ident + _escapechar(c)
|
|
if re.match("[0-9]", ident):
|
|
ident = "_" + ident
|
|
return ident
|
|
|
|
|
|
def identifierToTag(ident):
|
|
"""the opposite of tagToIdentifier()"""
|
|
if ident == "GlyphOrder":
|
|
return ident
|
|
if len(ident) % 2 and ident[0] == "_":
|
|
ident = ident[1:]
|
|
assert not (len(ident) % 2)
|
|
tag = ""
|
|
for i in range(0, len(ident), 2):
|
|
if ident[i] == "_":
|
|
tag = tag + ident[i+1]
|
|
elif ident[i+1] == "_":
|
|
tag = tag + ident[i]
|
|
else:
|
|
# assume hex
|
|
tag = tag + chr(int(ident[i:i+2], 16))
|
|
# append trailing spaces
|
|
tag = tag + (4 - len(tag)) * ' '
|
|
return Tag(tag)
|
|
|
|
|
|
def tagToXML(tag):
|
|
"""Similarly to tagToIdentifier(), this converts a TT tag
|
|
to a valid XML element name. Since XML element names are
|
|
case sensitive, this is a fairly simple/readable translation.
|
|
"""
|
|
import re
|
|
tag = Tag(tag)
|
|
if tag == "OS/2":
|
|
return "OS_2"
|
|
elif tag == "GlyphOrder":
|
|
return tag
|
|
if re.match("[A-Za-z_][A-Za-z_0-9]* *$", tag):
|
|
return tag.strip()
|
|
else:
|
|
return tagToIdentifier(tag)
|
|
|
|
|
|
def xmlToTag(tag):
|
|
"""The opposite of tagToXML()"""
|
|
if tag == "OS_2":
|
|
return Tag("OS/2")
|
|
if len(tag) == 8:
|
|
return identifierToTag(tag)
|
|
else:
|
|
return Tag(tag + " " * (4 - len(tag)))
|
|
|
|
|
|
|
|
# Table order as recommended in the OpenType specification 1.4
|
|
TTFTableOrder = ["head", "hhea", "maxp", "OS/2", "hmtx", "LTSH", "VDMX",
|
|
"hdmx", "cmap", "fpgm", "prep", "cvt ", "loca", "glyf",
|
|
"kern", "name", "post", "gasp", "PCLT"]
|
|
|
|
OTFTableOrder = ["head", "hhea", "maxp", "OS/2", "name", "cmap", "post",
|
|
"CFF "]
|
|
|
|
def sortedTagList(tagList, tableOrder=None):
|
|
"""Return a sorted copy of tagList, sorted according to the OpenType
|
|
specification, or according to a custom tableOrder. If given and not
|
|
None, tableOrder needs to be a list of tag names.
|
|
"""
|
|
tagList = sorted(tagList)
|
|
if tableOrder is None:
|
|
if "DSIG" in tagList:
|
|
# DSIG should be last (XXX spec reference?)
|
|
tagList.remove("DSIG")
|
|
tagList.append("DSIG")
|
|
if "CFF " in tagList:
|
|
tableOrder = OTFTableOrder
|
|
else:
|
|
tableOrder = TTFTableOrder
|
|
orderedTables = []
|
|
for tag in tableOrder:
|
|
if tag in tagList:
|
|
orderedTables.append(tag)
|
|
tagList.remove(tag)
|
|
orderedTables.extend(tagList)
|
|
return orderedTables
|
|
|
|
|
|
def reorderFontTables(inFile, outFile, tableOrder=None, checkChecksums=False):
|
|
"""Rewrite a font file, ordering the tables as recommended by the
|
|
OpenType specification 1.4.
|
|
"""
|
|
inFile.seek(0)
|
|
outFile.seek(0)
|
|
reader = SFNTReader(inFile, checkChecksums=checkChecksums)
|
|
writer = SFNTWriter(outFile, len(reader.tables), reader.sfntVersion, reader.flavor, reader.flavorData)
|
|
tables = list(reader.keys())
|
|
for tag in sortedTagList(tables, tableOrder):
|
|
writer[tag] = reader[tag]
|
|
writer.close()
|
|
|
|
|
|
def maxPowerOfTwo(x):
|
|
"""Return the highest exponent of two, so that
|
|
(2 ** exponent) <= x. Return 0 if x is 0.
|
|
"""
|
|
exponent = 0
|
|
while x:
|
|
x = x >> 1
|
|
exponent = exponent + 1
|
|
return max(exponent - 1, 0)
|
|
|
|
|
|
def getSearchRange(n, itemSize=16):
|
|
"""Calculate searchRange, entrySelector, rangeShift.
|
|
"""
|
|
# itemSize defaults to 16, for backward compatibility
|
|
# with upstream fonttools.
|
|
exponent = maxPowerOfTwo(n)
|
|
searchRange = (2 ** exponent) * itemSize
|
|
entrySelector = exponent
|
|
rangeShift = max(0, n * itemSize - searchRange)
|
|
return searchRange, entrySelector, rangeShift
|