def decompile(self, data, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
glyphs = ttFont.getGlyphOrder()
sstruct.unpack(GVAR_HEADER_FORMAT, data[0:GVAR_HEADER_SIZE], self)
assert len(glyphs) == self.glyphCount
assert len(axisTags) == self.axisCount
offsets = self.decompileOffsets_(data[GVAR_HEADER_SIZE:], tableFormat=(self.flags & 1), glyphCount=self.glyphCount)
sharedCoords = tv.decompileSharedTuples(
axisTags, self.sharedTupleCount, data, self.offsetToSharedTuples)
self.variations = {}
offsetToData = self.offsetToGlyphVariationData
for i in range(self.glyphCount):
glyphName = glyphs[i]
glyph = ttFont["glyf"][glyphName]
numPointsInGlyph = self.getNumPoints_(glyph)
gvarData = data[offsetToData + offsets[i] : offsetToData + offsets[i + 1]]
try:
self.variations[glyphName] = decompileGlyph_(
numPointsInGlyph, sharedCoords, axisTags, gvarData)
except Exception:
log.error(
"Failed to decompile deltas for glyph '%s' (%d points)",
glyphName, numPointsInGlyph,
)
raise
def decompile(self, data, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
glyphs = ttFont.getGlyphOrder()
sstruct.unpack(GVAR_HEADER_FORMAT, data[0:GVAR_HEADER_SIZE], self)
assert len(glyphs) == self.glyphCount
assert len(axisTags) == self.axisCount
offsets = self.decompileOffsets_(data[GVAR_HEADER_SIZE:],
tableFormat=(self.flags & 1),
glyphCount=self.glyphCount)
sharedCoords = tv.decompileSharedTuples(axisTags,
self.sharedTupleCount, data,
self.offsetToSharedTuples)
self.variations = {}
offsetToData = self.offsetToGlyphVariationData
for i in range(self.glyphCount):
glyphName = glyphs[i]
glyph = ttFont["glyf"][glyphName]
numPointsInGlyph = self.getNumPoints_(glyph)
gvarData = data[offsetToData + offsets[i]:offsetToData +
offsets[i + 1]]
try:
self.variations[glyphName] = decompileGlyph_(
numPointsInGlyph, sharedCoords, axisTags, gvarData)
except Exception:
log.error(
"Failed to decompile deltas for glyph '%s' (%d points)",
glyphName,
numPointsInGlyph,
)
raise
def compile(self, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
sharedTuples = tv.compileSharedTuples(
axisTags, itertools.chain(*self.variations.values()))
sharedTupleIndices = {coord:i for i, coord in enumerate(sharedTuples)}
sharedTupleSize = sum([len(c) for c in sharedTuples])
compiledGlyphs = self.compileGlyphs_(
ttFont, axisTags, sharedTupleIndices)
offset = 0
offsets = []
for glyph in compiledGlyphs:
offsets.append(offset)
offset += len(glyph)
offsets.append(offset)
compiledOffsets, tableFormat = self.compileOffsets_(offsets)
header = {}
header["version"] = self.version
header["reserved"] = self.reserved
header["axisCount"] = len(axisTags)
header["sharedTupleCount"] = len(sharedTuples)
header["offsetToSharedTuples"] = GVAR_HEADER_SIZE + len(compiledOffsets)
header["glyphCount"] = len(compiledGlyphs)
header["flags"] = tableFormat
header["offsetToGlyphVariationData"] = header["offsetToSharedTuples"] + sharedTupleSize
compiledHeader = sstruct.pack(GVAR_HEADER_FORMAT, header)
result = [compiledHeader, compiledOffsets]
result.extend(sharedTuples)
result.extend(compiledGlyphs)
return bytesjoin(result)
def compile(self, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
sharedTuples = tv.compileSharedTuples(
axisTags, itertools.chain(*self.variations.values()))
sharedTupleIndices = {coord: i for i, coord in enumerate(sharedTuples)}
sharedTupleSize = sum([len(c) for c in sharedTuples])
compiledGlyphs = self.compileGlyphs_(ttFont, axisTags,
sharedTupleIndices)
offset = 0
offsets = []
for glyph in compiledGlyphs:
offsets.append(offset)
offset += len(glyph)
offsets.append(offset)
compiledOffsets, tableFormat = self.compileOffsets_(offsets)
header = {}
header["version"] = self.version
header["reserved"] = self.reserved
header["axisCount"] = len(axisTags)
header["sharedTupleCount"] = len(sharedTuples)
header["offsetToSharedTuples"] = GVAR_HEADER_SIZE + len(
compiledOffsets)
header["glyphCount"] = len(compiledGlyphs)
header["flags"] = tableFormat
header["offsetToGlyphVariationData"] = header[
"offsetToSharedTuples"] + sharedTupleSize
compiledHeader = sstruct.pack(GVAR_HEADER_FORMAT, header)
result = [compiledHeader, compiledOffsets]
result.extend(sharedTuples)
result.extend(compiledGlyphs)
return bytesjoin(result)
def decompile(self, data, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
glyphs = ttFont.getGlyphOrder()
sstruct.unpack(GVAR_HEADER_FORMAT, data[0:GVAR_HEADER_SIZE], self)
assert len(glyphs) == self.glyphCount
assert len(axisTags) == self.axisCount
offsets = self.decompileOffsets_(data[GVAR_HEADER_SIZE:],
tableFormat=(self.flags & 1),
glyphCount=self.glyphCount)
sharedCoords = tv.decompileSharedTuples(axisTags,
self.sharedTupleCount, data,
self.offsetToSharedTuples)
self.variations = _lazy_dict()
offsetToData = self.offsetToGlyphVariationData
glyf = ttFont['glyf']
for i in range(self.glyphCount):
glyphName = glyphs[i]
glyph = glyf[glyphName]
numPointsInGlyph = self.getNumPoints_(glyph)
gvarData = data[offsetToData + offsets[i]:offsetToData +
offsets[i + 1]]
self.variations[glyphName] = partial(decompileGlyph_,
numPointsInGlyph,
sharedCoords, axisTags,
gvarData)
def decompileGlyph_(pointCount, sharedTuples, axisTags, data):
if len(data) < 4:
return []
tupleVariationCount, offsetToData = struct.unpack(">HH", data[:4])
dataPos = offsetToData
return tv.decompileTupleVariationStore("gvar", axisTags,
tupleVariationCount, pointCount,
sharedTuples, data, 4, offsetToData)
def decompileGlyph_(pointCount, sharedTuples, axisTags, data):
if len(data) < 4:
return []
tupleVariationCount, offsetToData = struct.unpack(">HH", data[:4])
dataPos = offsetToData
return tv.decompileTupleVariationStore("gvar", axisTags,
tupleVariationCount, pointCount,
sharedTuples, data, 4, offsetToData)
def compileGlyph_(variations, pointCount, axisTags, sharedCoordIndices):
tupleVariationCount, tuples, data = tv.compileTupleVariationStore(
variations, pointCount, axisTags, sharedCoordIndices)
if tupleVariationCount == 0:
return b""
result = (struct.pack(">HH", tupleVariationCount, 4 + len(tuples)) +
tuples + data)
if len(result) % 2 != 0:
result = result + b"\0" # padding
return result
def compileGlyph_(variations, pointCount, axisTags, sharedCoordIndices):
tupleVariationCount, tuples, data = tv.compileTupleVariationStore(
variations, pointCount, axisTags, sharedCoordIndices)
if tupleVariationCount == 0:
return b""
result = (struct.pack(">HH", tupleVariationCount, 4 + len(tuples)) +
tuples + data)
if len(result) % 2 != 0:
result = result + b"\0" # padding
return result
def compileGlyph_(variations, pointCount, axisTags, sharedCoordIndices):
tupleVariationCount, tuples, data = tv.compileTupleVariationStore(
variations, pointCount, axisTags, sharedCoordIndices)
if tupleVariationCount == 0:
return b""
result = [
struct.pack(">HH", tupleVariationCount, 4 + len(tuples)), tuples, data
]
if (len(tuples) + len(data)) % 2 != 0:
result.append(b"\0") # padding
return b''.join(result)
