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from . import DefaultTable
from fontTools.misc import sstruct
from fontTools.misc.textTools import bytesjoin
from fontTools.ttLib.tables.TupleVariation import \
compileTupleVariationStore, decompileTupleVariationStore, TupleVariation
# https://www.microsoft.com/typography/otspec/cvar.htm
# https://www.microsoft.com/typography/otspec/otvarcommonformats.htm
# https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cvar.html
CVAR_HEADER_FORMAT = """
> # big endian
majorVersion: H
minorVersion: H
tupleVariationCount: H
offsetToData: H
"""
CVAR_HEADER_SIZE = sstruct.calcsize(CVAR_HEADER_FORMAT)
class table__c_v_a_r(DefaultTable.DefaultTable):
dependencies = ["cvt ", "fvar"]
def __init__(self, tag=None):
DefaultTable.DefaultTable.__init__(self, tag)
self.majorVersion, self.minorVersion = 1, 0
self.variations = []
def compile(self, ttFont, useSharedPoints=False):
tupleVariationCount, tuples, data = compileTupleVariationStore(
variations=[v for v in self.variations if v.hasImpact()],
pointCount=len(ttFont["cvt "].values),
axisTags=[axis.axisTag for axis in ttFont["fvar"].axes],
sharedTupleIndices={},
useSharedPoints=useSharedPoints)
header = {
"majorVersion": self.majorVersion,
"minorVersion": self.minorVersion,
"tupleVariationCount": tupleVariationCount,
"offsetToData": CVAR_HEADER_SIZE + len(tuples),
}
return b''.join([
sstruct.pack(CVAR_HEADER_FORMAT, header),
tuples,
data
])
def decompile(self, data, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
header = {}
sstruct.unpack(CVAR_HEADER_FORMAT, data[0:CVAR_HEADER_SIZE], header)
self.majorVersion = header["majorVersion"]
self.minorVersion = header["minorVersion"]
assert self.majorVersion == 1, self.majorVersion
self.variations = decompileTupleVariationStore(
tableTag=self.tableTag, axisTags=axisTags,
tupleVariationCount=header["tupleVariationCount"],
pointCount=len(ttFont["cvt "].values), sharedTuples=None,
data=data, pos=CVAR_HEADER_SIZE, dataPos=header["offsetToData"])
def fromXML(self, name, attrs, content, ttFont):
if name == "version":
self.majorVersion = int(attrs.get("major", "1"))
self.minorVersion = int(attrs.get("minor", "0"))
elif name == "tuple":
valueCount = len(ttFont["cvt "].values)
var = TupleVariation({}, [None] * valueCount)
self.variations.append(var)
for tupleElement in content:
if isinstance(tupleElement, tuple):
tupleName, tupleAttrs, tupleContent = tupleElement
var.fromXML(tupleName, tupleAttrs, tupleContent)
def toXML(self, writer, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
writer.simpletag("version",
major=self.majorVersion, minor=self.minorVersion)
writer.newline()
for var in self.variations:
var.toXML(writer, axisTags)
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