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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
from io import StringIO
from fontTools.designspaceLib import (
AxisDescriptor,
DesignSpaceDocument,
SourceDescriptor,
)
from fontTools.fontBuilder import FontBuilder
from fontTools.misc.xmlWriter import XMLWriter
from fontTools.pens.ttGlyphPen import TTGlyphPen
from fontTools.varLib import build
from fontTools.varLib.builder import buildVarData
import pytest
@pytest.mark.parametrize(
"region_indices, items, expected_num_shorts",
[
([], [], 0),
([0], [[1]], 0),
([0], [[128]], 1),
([0, 1, 2], [[128, 1, 2], [3, -129, 5], [6, 7, 8]], 2),
([0, 1, 2], [[0, 128, 2], [3, 4, 5], [6, 7, -129]], 3),
([0], [[32768]], 0x8001),
([0, 1, 2], [[32768, 1, 2], [3, -129, 5], [6, 7, 8]], 0x8001),
([0, 1, 2], [[32768, 1, 2], [3, -32769, 5], [6, 7, 8]], 0x8002),
([0, 1, 2], [[0, 32768, 2], [3, 4, 5], [6, 7, -32769]], 0x8003),
],
ids=[
"0_regions_0_deltas",
"1_region_1_uint8",
"1_region_1_short",
"3_regions_2_shorts_ordered",
"3_regions_2_shorts_unordered",
"1_region_1_long",
"3_regions_1_long_ordered",
"3_regions_2_longs_ordered",
"3_regions_2_longs_unordered",
],
)
def test_buildVarData_no_optimize(region_indices, items, expected_num_shorts):
data = buildVarData(region_indices, items, optimize=False)
assert data.ItemCount == len(items)
assert data.NumShorts == expected_num_shorts
assert data.VarRegionCount == len(region_indices)
assert data.VarRegionIndex == region_indices
assert data.Item == items
@pytest.mark.parametrize(
[
"region_indices",
"items",
"expected_num_shorts",
"expected_regions",
"expected_items",
],
[
(
[0, 1, 2],
[[0, 1, 2], [3, 4, 5], [6, 7, 8]],
0,
[0, 1, 2],
[[0, 1, 2], [3, 4, 5], [6, 7, 8]],
),
(
[0, 1, 2],
[[0, 128, 2], [3, 4, 5], [6, 7, 8]],
1,
[1, 0, 2],
[[128, 0, 2], [4, 3, 5], [7, 6, 8]],
),
(
[0, 1, 2],
[[0, 1, 128], [3, 4, 5], [6, -129, 8]],
2,
[1, 2, 0],
[[1, 128, 0], [4, 5, 3], [-129, 8, 6]],
),
(
[0, 1, 2],
[[128, 1, -129], [3, 4, 5], [6, 7, 8]],
2,
[0, 2, 1],
[[128, -129, 1], [3, 5, 4], [6, 8, 7]],
),
(
[0, 1, 2],
[[0, 1, 128], [3, -129, 5], [256, 7, 8]],
3,
[0, 1, 2],
[[0, 1, 128], [3, -129, 5], [256, 7, 8]],
),
(
[0, 1, 2],
[[0, 128, 2], [0, 4, 5], [0, 7, 8]],
1,
[1, 2],
[[128, 2], [4, 5], [7, 8]],
),
(
[0, 1, 2],
[[0, 32768, 2], [3, 4, 5], [6, 7, 8]],
0x8001,
[1, 0, 2],
[[32768, 0, 2], [4, 3, 5], [7, 6, 8]],
),
(
[0, 1, 2],
[[0, 1, 32768], [3, 4, 5], [6, -32769, 8]],
0x8002,
[1, 2, 0],
[[1, 32768, 0], [4, 5, 3], [-32769, 8, 6]],
),
(
[0, 1, 2],
[[32768, 1, -32769], [3, 4, 5], [6, 7, 8]],
0x8002,
[0, 2, 1],
[[32768, -32769, 1], [3, 5, 4], [6, 8, 7]],
),
(
[0, 1, 2],
[[0, 1, 32768], [3, -32769, 5], [65536, 7, 8]],
0x8003,
[0, 1, 2],
[[0, 1, 32768], [3, -32769, 5], [65536, 7, 8]],
),
(
[0, 1, 2],
[[0, 32768, 2], [0, 4, 5], [0, 7, 8]],
0x8001,
[1, 2],
[[32768, 2], [4, 5], [7, 8]],
),
],
ids=[
"0/3_shorts_no_reorder",
"1/3_shorts_reorder",
"2/3_shorts_reorder",
"2/3_shorts_same_row_reorder",
"3/3_shorts_no_reorder",
"1/3_shorts_1/3_zeroes",
"1/3_longs_reorder",
"2/3_longs_reorder",
"2/3_longs_same_row_reorder",
"3/3_longs_no_reorder",
"1/3_longs_1/3_zeroes",
],
)
def test_buildVarData_optimize(
region_indices, items, expected_num_shorts, expected_regions, expected_items
):
data = buildVarData(region_indices, items, optimize=True)
assert data.ItemCount == len(items)
assert data.NumShorts == expected_num_shorts
assert data.VarRegionCount == len(expected_regions)
assert data.VarRegionIndex == expected_regions
assert data.Item == expected_items
def test_empty_vhvar_size():
"""HVAR/VHVAR should be present but empty when there are no glyph metrics
variations, and should use a direct mapping for optimal encoding."""
# Make a designspace that varies the outlines of 'A' but not its advance.
doc = DesignSpaceDocument()
doc.addAxis(
AxisDescriptor(tag="wght", name="Weight", minimum=400, default=400, maximum=700)
)
for wght in (400, 700):
# Outlines depend on weight.
pen = TTGlyphPen(None)
pen.lineTo((0, wght))
pen.lineTo((wght, wght))
pen.lineTo((wght, 0))
pen.closePath()
glyphs = {"A": pen.glyph()}
fb = FontBuilder(unitsPerEm=1000)
fb.setupGlyphOrder(list(glyphs.keys()))
fb.setupGlyf(glyphs)
# Horizontal advance does not vary.
fb.setupHorizontalMetrics(
{name: (500, fb.font["glyf"][name].xMin) for name in glyphs} # type: ignore
)
fb.setupHorizontalHeader(ascent=1000, descent=0)
# Vertical advance does not vary.
fb.setupVerticalMetrics(
{name: (500, 1000 - fb.font["glyf"][name].yMax) for name in glyphs} # type: ignore
)
fb.setupVerticalHeader(ascent=1000, descent=0)
fb.setupNameTable({"familyName": "TestEmptyVhvar", "styleName": "Regular"})
fb.setupPost()
doc.addSource(SourceDescriptor(font=fb.font, location={"Weight": wght}))
# Compile.
vf, *_ = build(doc)
# Test both tables' encodings:
for table in ("HVAR", "VVAR"):
# Variable glyph metrics table should be built even when there are no
# glyph metrics variations.
assert table in vf
# The table should be empty, and use a direct mapping for optimal size.
expected = """
<?xml version="1.0" encoding="UTF-8"?>
<Version value="0x00010000"/>
<VarStore Format="1">
<Format value="1"/>
<VarRegionList>
<!-- RegionAxisCount=1 -->
<!-- RegionCount=0 -->
</VarRegionList>
<!-- VarDataCount=1 -->
<VarData index="0">
<!-- ItemCount=1 -->
<NumShorts value="0"/>
<!-- VarRegionCount=0 -->
<Item index="0" value="[]"/>
</VarData>
</VarStore>
""".lstrip()
with StringIO() as buffer:
writer = XMLWriter(buffer)
vf[table].toXML(writer, vf)
actual = buffer.getvalue()
assert actual == expected
# The table should be encodable in at least this size.
# (VVAR has an extra Offset32 to point to a vertical origin mapping)
optimal_size = {"HVAR": 42, "VVAR": 46}[table]
assert len(vf[table].compile(vf)) <= optimal_size
if __name__ == "__main__":
import sys
sys.exit(pytest.main(sys.argv))
|
