7433ac786a
we could alternatively decode these version fields as a long integer like we do elsewhere for similar table versions, but I am not sure whether external code relies on them being like they are now (i.e. compact decimal float). https://github.com/fonttools/fonttools/issues/944
220 lines
8.3 KiB
Python
220 lines
8.3 KiB
Python
from fontTools.misc.py23 import *
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from fontTools.misc import sstruct
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from fontTools.misc.fixedTools import floatToFixedToStr
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from fontTools.misc.textTools import safeEval
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from itertools import *
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from functools import partial
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from . import DefaultTable
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from . import grUtils
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import struct, operator, warnings
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Glat_format_0 = """
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> # big endian
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version: 16.16F
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"""
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Glat_format_3 = """
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>
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version: 16.16F
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compression:L # compression scheme or reserved
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"""
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Glat_format_1_entry = """
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>
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attNum: B # Attribute number of first attribute
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num: B # Number of attributes in this run
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"""
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Glat_format_23_entry = """
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>
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attNum: H # Attribute number of first attribute
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num: H # Number of attributes in this run
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"""
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Glat_format_3_octabox_metrics = """
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>
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subboxBitmap: H # Which subboxes exist on 4x4 grid
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diagNegMin: B # Defines minimum negatively-sloped diagonal (si)
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diagNegMax: B # Defines maximum negatively-sloped diagonal (sa)
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diagPosMin: B # Defines minimum positively-sloped diagonal (di)
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diagPosMax: B # Defines maximum positively-sloped diagonal (da)
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"""
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Glat_format_3_subbox_entry = """
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>
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left: B # xi
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right: B # xa
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bottom: B # yi
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top: B # ya
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diagNegMin: B # Defines minimum negatively-sloped diagonal (si)
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diagNegMax: B # Defines maximum negatively-sloped diagonal (sa)
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diagPosMin: B # Defines minimum positively-sloped diagonal (di)
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diagPosMax: B # Defines maximum positively-sloped diagonal (da)
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"""
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class _Object() :
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pass
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class _Dict(dict) :
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pass
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class table_G__l_a_t(DefaultTable.DefaultTable):
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'''
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Support Graphite Glat tables
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'''
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def __init__(self, tag=None):
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DefaultTable.DefaultTable.__init__(self, tag)
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self.scheme = 0
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def decompile(self, data, ttFont):
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sstruct.unpack2(Glat_format_0, data, self)
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self.version = float(floatToFixedToStr(self.version, precisionBits=16))
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if self.version <= 1.9:
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decoder = partial(self.decompileAttributes12,fmt=Glat_format_1_entry)
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elif self.version <= 2.9:
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decoder = partial(self.decompileAttributes12,fmt=Glat_format_23_entry)
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elif self.version >= 3.0:
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(data, self.scheme) = grUtils.decompress(data)
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sstruct.unpack2(Glat_format_3, data, self)
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self.hasOctaboxes = (self.compression & 1) == 1
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decoder = self.decompileAttributes3
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gloc = ttFont['Gloc']
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self.attributes = {}
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count = 0
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for s,e in zip(gloc,gloc[1:]):
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self.attributes[ttFont.getGlyphName(count)] = decoder(data[s:e])
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count += 1
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def decompileAttributes12(self, data, fmt):
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attributes = _Dict()
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while len(data) > 3:
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e, data = sstruct.unpack2(fmt, data, _Object())
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keys = range(e.attNum, e.attNum+e.num)
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if len(data) >= 2 * e.num :
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vals = struct.unpack_from(('>%dh' % e.num), data)
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attributes.update(zip(keys,vals))
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data = data[2*e.num:]
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return attributes
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def decompileAttributes3(self, data):
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if self.hasOctaboxes:
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o, data = sstruct.unpack2(Glat_format_3_octabox_metrics, data, _Object())
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numsub = bin(o.subboxBitmap).count("1")
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o.subboxes = []
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for b in range(numsub):
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if len(data) >= 8 :
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subbox, data = sstruct.unpack2(Glat_format_3_subbox_entry,
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data, _Object())
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o.subboxes.append(subbox)
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attrs = self.decompileAttributes12(data, Glat_format_23_entry)
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if self.hasOctaboxes:
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attrs.octabox = o
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return attrs
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def compile(self, ttFont):
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data = sstruct.pack(Glat_format_0, self)
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if self.version <= 1.9:
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encoder = partial(self.compileAttributes12, fmt=Glat_format_1_entry)
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elif self.version <= 2.9:
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encoder = partial(self.compileAttributes12, fmt=Glat_format_1_entry)
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elif self.version >= 3.0:
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self.compression = (self.scheme << 27) + (1 if self.hasOctaboxes else 0)
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data = sstruct.pack(Glat_format_3, self)
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encoder = self.compileAttributes3
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glocs = []
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for n in range(len(self.attributes)):
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glocs.append(len(data))
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data += encoder(self.attributes[ttFont.getGlyphName(n)])
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glocs.append(len(data))
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ttFont['Gloc'].set(glocs)
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if self.version >= 3.0:
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data = grUtils.compress(self.scheme, data)
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return data
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def compileAttributes12(self, attrs, fmt):
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data = b""
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for e in grUtils.entries(attrs):
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data += sstruct.pack(fmt, {'attNum' : e[0], 'num' : e[1]}) + \
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struct.pack(('>%dh' % len(e[2])), *e[2])
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return data
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def compileAttributes3(self, attrs):
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if self.hasOctaboxes:
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o = attrs.octabox
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data = sstruct.pack(Glat_format_3_octabox_metrics, o)
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numsub = bin(o.subboxBitmap).count("1")
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for b in range(numsub) :
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data += sstruct.pack(Glat_format_3_subbox_entry, o.subboxes[b])
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else:
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data = ""
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return data + self.compileAttributes12(attrs, Glat_format_23_entry)
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def toXML(self, writer, ttFont):
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writer.simpletag('version', version=self.version, compressionScheme=self.scheme)
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writer.newline()
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for n, a in sorted(self.attributes.items(), key=lambda x:ttFont.getGlyphID(x[0])):
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writer.begintag('glyph', name=n)
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writer.newline()
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if hasattr(a, 'octabox'):
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o = a.octabox
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formatstring, names, fixes = sstruct.getformat(Glat_format_3_octabox_metrics)
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vals = {}
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for k in names:
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if k == 'subboxBitmap': continue
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vals[k] = "{:.3f}%".format(getattr(o, k) * 100. / 255)
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vals['bitmap'] = "{:0X}".format(o.subboxBitmap)
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writer.begintag('octaboxes', **vals)
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writer.newline()
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formatstring, names, fixes = sstruct.getformat(Glat_format_3_subbox_entry)
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for s in o.subboxes:
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vals = {}
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for k in names:
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vals[k] = "{:.3f}%".format(getattr(s, k) * 100. / 255)
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writer.simpletag('octabox', **vals)
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writer.newline()
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writer.endtag('octaboxes')
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writer.newline()
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for k, v in sorted(a.items()):
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writer.simpletag('attribute', index=k, value=v)
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writer.newline()
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writer.endtag('glyph')
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writer.newline()
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def fromXML(self, name, attrs, content, ttFont):
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if name == 'version' :
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self.version = float(safeEval(attrs['version']))
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self.scheme = int(safeEval(attrs['compressionScheme']))
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if name != 'glyph' : return
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if not hasattr(self, 'attributes'):
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self.attributes = {}
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gname = attrs['name']
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attributes = _Dict()
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for element in content:
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if not isinstance(element, tuple): continue
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tag, attrs, subcontent = element
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if tag == 'attribute' :
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k = int(safeEval(attrs['index']))
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v = int(safeEval(attrs['value']))
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attributes[k]=v
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elif tag == 'octaboxes':
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self.hasOctaboxes = True
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o = _Object()
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o.subboxBitmap = int(attrs['bitmap'], 16)
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o.subboxes = []
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del attrs['bitmap']
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for k, v in attrs.items():
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setattr(o, k, int(float(v[:-1]) * 255. / 100. + 0.5))
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for element in subcontent:
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if not isinstance(element, tuple): continue
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(tag, attrs, subcontent) = element
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so = _Object()
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for k, v in attrs.items():
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setattr(so, k, int(float(v[:-1]) * 255. / 100. + 0.5))
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o.subboxes.append(so)
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attributes.octabox = o
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self.attributes[gname] = attributes
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