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update test_reference_table
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@mcratt
mcratt committed Dec 19, 2024
1 parent 0807dc8 commit d0f2f55
Showing 1 changed file with 2 additions and 165 deletions.
167 changes: 2 additions & 165 deletions tests/test_uharfbuzz.py
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Original file line number Diff line number Diff line change
Expand Up @@ -787,176 +787,13 @@ def test_list_names_with_user_names(self, mutatorsans):
]

def test_reference_table(self, blankfont):
head_format = {
# (offset, length, type)
"majorVersion": (0, 2, "H"), # uint16
"minorVersion": (2, 2, "H"), # uint16
"fontRevision": (4, 4, "f"), # Fixed (float)
"checksumAdjustment": (8, 4, "I"), # uint32
"magicNumber": (12, 4, "I"), # uint32
"flags": (16, 2, "H"), # uint16
"unitsPerEm": (18, 2, "H"), # uint16
"created": (20, 8, "Q"), # LONGDATETIME (8 bytes, signed long long)
"modified": (28, 8, "Q"), # LONGDATETIME (8 bytes, signed long long)
"xMin": (36, 2, "h"), # int16
"yMin": (38, 2, "h"), # int16
"xMax": (40, 2, "h"), # int16
"yMax": (42, 2, "h"), # int16
"macStyle": (44, 2, "H"), # uint16
"lowestRecPPEM": (46, 2, "H"), # uint16
"fontDirectionHint": (48, 2, "h"), # int16
"indexToLocFormat": (50, 2, "h"), # int16
"glyphDataFormat": (52, 2, "h"), # int16
}
os2_format = {
# (offset, length, type) V5
"version": (0, 2, "H"), # uint16
"xAvgCharWidth": (2, 2, "h"), # int16
"usWeightClass": (4, 2, "H"), # uint16
"usWidthClass": (6, 2, "H"), # uint16
"fsType": (8, 2, "H"), # uint16
"ySubscriptXSize": (10, 2, "h"), # int16
"ySubscriptYSize": (12, 2, "h"), # int16
"ySubscriptXOffset": (14, 2, "h"), # int16
"ySubscriptYOffset": (16, 2, "h"), # int16
"ySuperscriptXSize": (18, 2, "h"), # int16
"ySuperscriptYSize": (20, 2, "h"), # int16
"ySuperscriptXOffset": (22, 2, "h"), # int16
"ySuperscriptYOffset": (24, 2, "h"), # int16
"yStrikeoutSize": (26, 2, "h"), # int16
"yStrikeoutPosition": (28, 2, "h"), # int16
"sFamilyClass": (30, 2, "h"), # int16
"panose": (32, 10, "10B"), # PANOSE (10 bytes, binary data)
"ulUnicodeRange1": (42, 4, "I"), # uint32
"ulUnicodeRange2": (46, 4, "I"), # uint32
"ulUnicodeRange3": (50, 4, "I"), # uint32
"ulUnicodeRange4": (54, 4, "I"), # uint32
"achVendID": (58, 4, "4s"), # String of 4 characters
"fsSelection": (62, 2, "H"), # uint16
"usFirstCharIndex": (64, 2, "H"), # uint16
"usLastCharIndex": (66, 2, "H"), # uint16
"sTypoAscender": (68, 2, "h"), # int16
"sTypoDescender": (70, 2, "h"), # int16
"sTypoLineGap": (72, 2, "h"), # int16
"usWinAscent": (74, 2, "H"), # uint16
"usWinDescent": (76, 2, "H"), # uint16
"ulCodePageRange1": (78, 4, "I"), # uint32
"ulCodePageRange2": (82, 4, "I"), # uint32
"sxHeight": (86, 2, "h"), # int16
"sCapHeight": (88, 2, "h"), # int16
"usDefaultChar": (90, 2, "H"), # uint16
"usBreakChar": (92, 2, "H"), # uint16
"usMaxContext": (94, 2, "H"), # uint16
"usLowerOpticalPointSize": (96, 2, "H"), # uint16
"usUpperOpticalPointSize": (98, 2, "H") # uint16
}
table_mapper = {
"OS/2": os2_format,
"head": head_format,
}

def parse_table(table_bytes, table_name: str, tag_filter=None):
data = {}
table_format = table_mapper.get(table_name)
if not table_format:
raise ValueError(f"undefined table: {table_name}")

byte_parsers = {
"H": lambda bytes_data: int.from_bytes(bytes_data, byteorder='big'),
"h": lambda bytes_data: int.from_bytes(bytes_data, byteorder='big', signed=True),
"I": lambda bytes_data: int.from_bytes(bytes_data, byteorder='big'),
"4s": lambda bytes_data: bytes_data.decode('utf-8').strip('\x00'),
"10B": lambda bytes_data: tuple(bytes_data),
"f": lambda bytes_data: struct.unpack('>f', bytes_data)[0],
"Q": lambda bytes_data: struct.unpack('>q', bytes_data)[0],
}
if tag_filter:
tag_filter = set(tag_filter)
table_format = {k: v for k, v in table_format.items() if k in tag_filter}
for tag, (offset, length, fmt) in table_format.items():
byte_slice = table_bytes[offset:offset + length]
if fmt == 'f':
raw_value = int.from_bytes(byte_slice, byteorder='big')
value = raw_value / 65536.0
else:
value = byte_parsers.get(fmt, lambda bytes_data: struct.unpack(fmt, bytes_data))(byte_slice)
data[tag] = value
return data

face = blankfont.face
if "OS/2" in face.table_tags:
blob = face.reference_table("OS/2")

table_data_filter = parse_table(blob.data, "OS/2", ["usWeightClass", "fsSelection"])
assert table_data_filter["usWeightClass"] == 400
assert table_data_filter["fsSelection"] == 64

table_data = parse_table(blob.data, "OS/2")
assert table_data == {'version': 3,
'xAvgCharWidth': 1000,
'usWeightClass': 400,
'usWidthClass': 5,
'fsType': 0,
'ySubscriptXSize': 650,
'ySubscriptYSize': 600,
'ySubscriptXOffset': 0,
'ySubscriptYOffset': 75,
'ySuperscriptXSize': 650,
'ySuperscriptYSize': 600,
'ySuperscriptXOffset': 0,
'ySuperscriptYOffset': 350,
'yStrikeoutSize': 50,
'yStrikeoutPosition': 220,
'sFamilyClass': 0,
'panose': (0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
'ulUnicodeRange1': 515,
'ulUnicodeRange2': 33554432,
'ulUnicodeRange3': 0,
'ulUnicodeRange4': 0,
'achVendID': 'ADBO',
'fsSelection': 64,
'usFirstCharIndex': 97,
'usLastCharIndex': 65535,
'sTypoAscender': 880,
'sTypoDescender': -120,
'sTypoLineGap': 0,
'usWinAscent': 880,
'usWinDescent': 120,
'ulCodePageRange1': 1613693439,
'ulCodePageRange2': 0,
'sxHeight': 0,
'sCapHeight': 0,
'usDefaultChar': 0,
'usBreakChar': 32,
'usMaxContext': 3,
'usLowerOpticalPointSize': 0,
'usUpperOpticalPointSize': 0}

assert len(blob.data) == 96
if "head" in face.table_tags:
blob = face.reference_table("head")

table_data_filter = parse_table(blob.data, "head", ["macStyle"])
assert table_data_filter["macStyle"] == 0

table_data = parse_table(blob.data, "head")
assert table_data == {'majorVersion': 1,
'minorVersion': 0,
'fontRevision': 1.0449981689453125,
'checksumAdjustment': 3927942351,
'magicNumber': 1594834165,
'flags': 3,
'unitsPerEm': 1000,
'created': 3511436787,
'modified': 3668103491,
'xMin': 0,
'yMin': 0,
'xMax': 0,
'yMax': 0,
'macStyle': 0,
'lowestRecPPEM': 3,
'fontDirectionHint': 2,
'indexToLocFormat': 0,
'glyphDataFormat': 0}
assert len(blob.data) == 54

class TestFont:
def test_get_glyph_extents(self, opensans):
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