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from fontTools.misc import sstruct
from fontTools.misc.textTools import safeEval
from . import DefaultTable
import array
import sys
Gloc_header = """
> # big endian
version: 16.16F # Table version
flags: H # bit 0: 1=long format, 0=short format
# bit 1: 1=attribute names, 0=no names
numAttribs: H # NUmber of attributes
"""
class table_G__l_o_c(DefaultTable.DefaultTable):
"""
Support Graphite Gloc tables
"""
dependencies = ["Glat"]
def __init__(self, tag=None):
DefaultTable.DefaultTable.__init__(self, tag)
self.attribIds = None
self.numAttribs = 0
def decompile(self, data, ttFont):
_, data = sstruct.unpack2(Gloc_header, data, self)
flags = self.flags
del self.flags
self.locations = array.array("I" if flags & 1 else "H")
self.locations.frombytes(data[: len(data) - self.numAttribs * (flags & 2)])
if sys.byteorder != "big":
self.locations.byteswap()
self.attribIds = array.array("H")
if flags & 2:
self.attribIds.frombytes(data[-self.numAttribs * 2 :])
if sys.byteorder != "big":
self.attribIds.byteswap()
def compile(self, ttFont):
data = sstruct.pack(
Gloc_header,
dict(
version=1.0,
flags=(bool(self.attribIds) << 1) + (self.locations.typecode == "I"),
numAttribs=self.numAttribs,
),
)
if sys.byteorder != "big":
self.locations.byteswap()
data += self.locations.tobytes()
if sys.byteorder != "big":
self.locations.byteswap()
if self.attribIds:
if sys.byteorder != "big":
self.attribIds.byteswap()
data += self.attribIds.tobytes()
if sys.byteorder != "big":
self.attribIds.byteswap()
return data
def set(self, locations):
long_format = max(locations) >= 65536
self.locations = array.array("I" if long_format else "H", locations)
def toXML(self, writer, ttFont):
writer.simpletag("attributes", number=self.numAttribs)
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name == "attributes":
self.numAttribs = int(safeEval(attrs["number"]))
def __getitem__(self, index):
return self.locations[index]
def __len__(self):
return len(self.locations)
def __iter__(self):
return iter(self.locations)
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