-
Notifications
You must be signed in to change notification settings - Fork 11
/
font.py
222 lines (184 loc) · 6.85 KB
/
font.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
from __future__ import unicode_literals
import weakref
from fontTools.ttLib import TTFont
from fontTools.pens.basePen import AbstractPen
from fontTools.misc.textTools import tostr
from compositor.layoutEngine import LayoutEngine
from compositor.glyphRecord import GlyphRecord
from compositor.cmap import extractCMAP
from compositor.error import CompositorError
class Font(LayoutEngine):
def __init__(self, path, glyphClass=None):
super(Font, self).__init__()
self.path = path
self._glyphs = {}
if isinstance(path, TTFont):
self.source = path
else:
self.source = TTFont(path)
self.loadGlyphSet()
self.loadCMAP()
self.loadFeatures()
self.loadInfo()
if glyphClass is None:
glyphClass = Glyph
self.glyphClass = glyphClass
def __del__(self):
del self._glyphs
self.source.close()
del self.source
# --------------
# initialization
# --------------
def loadCMAP(self):
cmap = extractCMAP(self.source)
self.setCMAP(cmap)
def loadGlyphSet(self):
self.glyphSet = self.source.getGlyphSet()
# the glyph order will be needed later
# to assign the proper glyph index to
# glyph objects.
order = self.source.getGlyphOrder()
self._glyphOrder = {}
for index, glyphName in enumerate(order):
self._glyphOrder[glyphName] = index
def loadInfo(self):
self.info = info = Info()
head = self.source["head"]
hhea = self.source["hhea"]
os2 = self.source["OS/2"]
info.unitsPerEm = head.unitsPerEm
info.ascender = hhea.ascent
info.descender = hhea.descent
info.xHeight = os2.sxHeight
info.capHeight = os2.sCapHeight
# names
nameIDs = {}
for nameRecord in self.source["name"].names:
nameID = nameRecord.nameID
platformID = nameRecord.platformID
platEncID = nameRecord.platEncID
langID = nameRecord.langID
nameIDs[nameID, platformID, platEncID, langID] = nameRecord.toUnicode()
# to retrieve the family and style names, first start
# with the preferred name entries and progress to less
# specific entries until something is found.
familyPriority = [(16, 1, 0, 0), (16, 1, None, None), (16, None, None, None),
(1, 1, 0, 0), (1, 1, None, None), (1, None, None, None)]
familyName = self._skimNameIDs(nameIDs, familyPriority)
stylePriority = [(17, 1, 0, 0), (17, 1, None, None), (17, None, None, None),
(2, 1, 0, 0), (2, 1, None, None), (2, None, None, None)]
styleName = self._skimNameIDs(nameIDs, stylePriority)
if familyName is None or styleName is None:
raise CompositorError("Could not extract name data from name table.")
self.info.familyName = familyName
self.info.styleName = styleName
# stylistic set names
self.stylisticSetNames = {}
if self.gsub:
for featureRecord in self.gsub.FeatureList.FeatureRecord:
params = featureRecord.Feature.FeatureParams
if hasattr(params, "UINameID"):
ssNameID = params.UINameID
namePriority = [(ssNameID, 1, 0, 0), (ssNameID, 1, None, None), (ssNameID, 3, 1, 1033), (ssNameID, 3, None, None)]
ssName = self._skimNameIDs(nameIDs, namePriority)
if ssName:
self.stylisticSetNames[featureRecord.FeatureTag] = ssName
def _skimNameIDs(self, nameIDs, priority):
for (nameID, platformID, platEncID, langID) in priority:
for (nID, pID, pEID, lID), text in nameIDs.items():
if nID != nameID:
continue
if pID != platformID and platformID is not None:
continue
if pEID != platEncID and platEncID is not None:
continue
if lID != langID and langID is not None:
continue
return text
def loadFeatures(self):
gdef = None
if "GDEF" in self.source:
gdef = self.source["GDEF"]
gsub = None
if "GSUB" in self.source:
gsub = self.source["GSUB"]
gpos = None
if "GPOS" in self.source:
gpos = self.source["GPOS"]
self.setFeatureTables(gdef, gsub, gpos)
# -------------
# dict behavior
# -------------
def keys(self):
return self.glyphSet.keys()
def __contains__(self, name):
return name in self.glyphSet
def __getitem__(self, name):
if name not in self._glyphs:
if name not in self.glyphSet:
name = self.fallbackGlyph
glyph = self.glyphSet[name]
index = self._glyphOrder[name]
glyph = self.glyphClass(name, index, glyph, self)
self._glyphs[name] = glyph
return self._glyphs[name]
# -----------------
# string processing
# -----------------
def stringToGlyphNames(self, string):
glyphNames = []
for c in string:
c = tostr(c)
v = ord(c)
if v in self.cmap:
glyphNames.append(self.cmap[v])
elif self.fallbackGlyph is not None:
glyphNames.append(self.fallbackGlyph)
return glyphNames
def stringToGlyphRecords(self, string):
return [GlyphRecord(glyphName) for glyphName in self.stringToGlyphNames(string)]
def didProcessingGSUB(self, glyphRecords):
for glyphRecord in glyphRecords:
glyphRecord.advanceWidth += self[glyphRecord.glyphName].width
# -------------
# Miscellaneous
# -------------
def getGlyphOrder(self):
return self.source.getGlyphOrder()
class Info(object): pass
class Glyph(object):
def __init__(self, name, index, source, font):
# the char string must be loaded by drawing it
if not hasattr(source, "width"):
source.draw(_GlyphLoadPen())
self.name = name
self.source = source
self.width = source.width
self.font = weakref.ref(font)
self.index = index
def draw(self, pen):
self.source.draw(pen)
def _get_bounds(self):
from fontTools.pens.boundsPen import BoundsPen
pen = BoundsPen(self.font())
self.draw(pen)
return pen.bounds
bounds = property(_get_bounds)
class _GlyphLoadPen(AbstractPen):
def __init__(self):
pass
def moveTo(self, pt):
pass
def lineTo(self, pt):
pass
def curveTo(self, *points):
pass
def qCurveTo(self, *points):
pass
def addComponent(self, glyphName, transformation):
pass
def closePath(self):
pass
def endPath(self):
pass