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1from . import DefaultTable
2import sys
3import array
4import logging
7log = logging.getLogger(__name__)
10class table__l_o_c_a(DefaultTable.DefaultTable):
11 """Index to Location table
13 The ``loca`` table stores the offsets in the ``glyf`` table that correspond
14 to the descriptions of each glyph. The glyphs are references by Glyph ID.
16 See also https://learn.microsoft.com/en-us/typography/opentype/spec/loca
17 """
19 dependencies = ["glyf"]
21 def decompile(self, data, ttFont):
22 longFormat = ttFont["head"].indexToLocFormat
23 if longFormat:
24 format = "I"
25 else:
26 format = "H"
27 locations = array.array(format)
28 locations.frombytes(data)
29 if sys.byteorder != "big":
30 locations.byteswap()
31 if not longFormat:
32 locations = array.array("I", (2 * l for l in locations))
33 if len(locations) < (ttFont["maxp"].numGlyphs + 1):
34 log.warning(
35 "corrupt 'loca' table, or wrong numGlyphs in 'maxp': %d %d",
36 len(locations) - 1,
37 ttFont["maxp"].numGlyphs,
38 )
39 self.locations = locations
41 def compile(self, ttFont):
42 try:
43 max_location = max(self.locations)
44 except AttributeError:
45 self.set([])
46 max_location = 0
47 if max_location < 0x20000 and all(l % 2 == 0 for l in self.locations):
48 locations = array.array("H")
49 for i in range(len(self.locations)):
50 locations.append(self.locations[i] // 2)
51 ttFont["head"].indexToLocFormat = 0
52 else:
53 locations = array.array("I", self.locations)
54 ttFont["head"].indexToLocFormat = 1
55 if sys.byteorder != "big":
56 locations.byteswap()
57 return locations.tobytes()
59 def set(self, locations):
60 self.locations = array.array("I", locations)
62 def toXML(self, writer, ttFont):
63 writer.comment("The 'loca' table will be calculated by the compiler")
64 writer.newline()
66 def __getitem__(self, index):
67 return self.locations[index]
69 def __len__(self):
70 return len(self.locations)