def test_transform_monospaced_sidebearings(self, ttFont):
hmtxTable = WOFF2HmtxTable()
metrics = ttFont["hmtx"].metrics
hmtxTable.metrics = metrics
# force one of the monospaced glyphs at the end of hmtx table to have
# its xMin different from its left sidebearing (50)
ttFont["glyf"]["one"].xMin = metrics["one"][1] + 1
data = hmtxTable.transform(ttFont)
assert data == (
b"\x01" # 00000001 | bits 1 unset: explicit monospaced sidebearings
# advanceWidthArray
b'\x01\xf4' # .notdef: 500
b'\x02X' # space: 600
b'\x02&' # A: 550
b'\x00\x00' # acutecomb: 0
b'\x02&' # Aacute: 550
b'\x01\xf4' # zero: 500
# leftSideBearingArray
b'\x002' # one: 50 (xMin: 51)
b'\x00(' # two: 40
)
def test_reconstruct_flags_reserved_bits(self): hmtxTable = WOFF2HmtxTable() with pytest.raises( ttLib.TTLibError, match="Bits 2-7 of 'hmtx' flags are reserved" ): hmtxTable.reconstruct(b"\xFF", ttFont=None)
def test_transform_proportional_sidebearings(self, ttFont):
hmtxTable = WOFF2HmtxTable()
metrics = ttFont["hmtx"].metrics
# force one of the proportional glyphs to have its left sidebearing be
# different from its xMin (40)
metrics["A"] = (550, 39)
hmtxTable.metrics = metrics
assert ttFont["glyf"]["A"].xMin != metrics["A"][1]
data = hmtxTable.transform(ttFont)
assert data == (
b"\x02" # 00000010 | bits 0 unset: explicit proportional sidebearings
# advanceWidthArray
b'\x01\xf4' # .notdef: 500
b'\x02X' # space: 600
b'\x02&' # A: 550
b'\x00\x00' # acutecomb: 0
b'\x02&' # Aacute: 550
b'\x01\xf4' # zero: 500
# lsbArray
b'\x002' # .notdef: 50
b'\x00\x00' # space: 0
b"\x00'" # A: 39 (xMin: 40)
b'\xff\xd8' # acutecomb: -40
b'\x00(' # Aacute: 40
b'\x00\x1e' # zero: 30
)
def test_reconstruct_too_much_data(self, ttFont): ttFont["hhea"].numberOfHMetrics = 2 data = b'\x03\x01\xf4\x02X\x02&' hmtxTable = WOFF2HmtxTable() with pytest.raises(ttLib.TTLibError, match="too much 'hmtx' table data"): hmtxTable.reconstruct(data, ttFont)
def test_reconstruct_monospaced_sidebearings(self, ttFont):
hmtxTable = WOFF2HmtxTable()
data = (
b"\x01" # 00000001 | bits 1 unset: explicit monospaced sidebearings
# advanceWidthArray
b'\x01\xf4' # .notdef: 500
b'\x02X' # space: 600
b'\x02&' # A: 550
b'\x00\x00' # acutecomb: 0
b'\x02&' # Aacute: 550
b'\x01\xf4' # zero: 500
# leftSideBearingArray
b'\x003' # one: 51 (xMin: 50)
b'\x00(' # two: 40
)
hmtxTable.reconstruct(data, ttFont)
assert hmtxTable.metrics == {
".notdef": (500, 50),
"space": (600, 0),
"A": (550, 40),
"acutecomb": (0, -40),
"Aacute": (550, 40),
"zero": (500, 30),
"one": (500, 51),
"two": (500, 40),
}
assert ttFont["glyf"]["one"].xMin == 50
def test_reconstruct_no_sidebearings(self, ttFont):
hmtxTable = WOFF2HmtxTable()
data = (
b"\x03" # 00000011 | bits 0 and 1 are set (no sidebearings arrays)
# advanceWidthArray
b'\x01\xf4' # .notdef: 500
b'\x02X' # space: 600
b'\x02&' # A: 550
b'\x00\x00' # acutecomb: 0
b'\x02&' # Aacute: 550
b'\x01\xf4' # zero: 500
)
hmtxTable.reconstruct(data, ttFont)
assert hmtxTable.metrics == {
".notdef": (500, 50),
"space": (600, 0),
"A": (550, 40),
"acutecomb": (0, -40),
"Aacute": (550, 40),
"zero": (500, 30),
"one": (500, 50),
"two": (500, 40),
}
def test_transform_not_applicable(self, ttFont): hmtxTable = WOFF2HmtxTable() metrics = ttFont["hmtx"].metrics # force both a proportional and monospaced glyph to have sidebearings # different from the respective xMin coordinates metrics["A"] = (550, 39) metrics["one"] = (500, 51) hmtxTable.metrics = metrics # 'None' signals to fall back using untransformed hmtx table data assert hmtxTable.transform(ttFont) is None
def test_transform_no_sidebearings(self, ttFont): hmtxTable = WOFF2HmtxTable() hmtxTable.metrics = ttFont["hmtx"].metrics data = hmtxTable.transform(ttFont) assert data == ( b"\x03" # 00000011 | bits 0 and 1 are set (no sidebearings arrays) # advanceWidthArray b'\x01\xf4' # .notdef: 500 b'\x02X' # space: 600 b'\x02&' # A: 550 b'\x00\x00' # acutecomb: 0 b'\x02&' # Aacute: 550 b'\x01\xf4' # zero: 500 )
def test_reconstruct_proportional_sidebearings(self, ttFont):
hmtxTable = WOFF2HmtxTable()
data = (
b"\x02" # 00000010 | bits 0 unset: explicit proportional sidebearings
# advanceWidthArray
b'\x01\xf4' # .notdef: 500
b'\x02X' # space: 600
b'\x02&' # A: 550
b'\x00\x00' # acutecomb: 0
b'\x02&' # Aacute: 550
b'\x01\xf4' # zero: 500
# lsbArray
b'\x002' # .notdef: 50
b'\x00\x00' # space: 0
b"\x00'" # A: 39 (xMin: 40)
b'\xff\xd8' # acutecomb: -40
b'\x00(' # Aacute: 40
b'\x00\x1e' # zero: 30
)
hmtxTable.reconstruct(data, ttFont)
assert hmtxTable.metrics == {
".notdef": (500, 50),
"space": (600, 0),
"A": (550, 39),
"acutecomb": (0, -40),
"Aacute": (550, 40),
"zero": (500, 30),
"one": (500, 50),
"two": (500, 40),
}
assert ttFont["glyf"]["A"].xMin == 40
def test_reconstruct_flags_required_bits(self): hmtxTable = WOFF2HmtxTable() with pytest.raises(ttLib.TTLibError, match="either bits 0 or 1 .* must set"): hmtxTable.reconstruct(b"\x00", ttFont=None)