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 = """