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from fontTools.misc import sstruct
from fontTools.misc.textTools import bytesjoin, safeEval, readHex
from . import DefaultTable
import sys
import array
GPKGFormat = """
> # big endian
version: H
flags: H
numGMAPs: H
numGlyplets: H
"""
# psFontName is a byte string which follows the record above. This is zero padded
# to the beginning of the records array. The recordsOffsst is 32 bit aligned.
class table_G_P_K_G_(DefaultTable.DefaultTable):
"""Glyphlets GPKG table
The ``GPKG`` table is used by Adobe's SING Glyphlets.
See also https://web.archive.org/web/20080627183635/http://www.adobe.com/devnet/opentype/gdk/topic.html
"""
def decompile(self, data, ttFont):
dummy, newData = sstruct.unpack2(GPKGFormat, data, self)
GMAPoffsets = array.array("I")
endPos = (self.numGMAPs + 1) * 4
GMAPoffsets.frombytes(newData[:endPos])
if sys.byteorder != "big":
GMAPoffsets.byteswap()
self.GMAPs = []
for i in range(self.numGMAPs):
start = GMAPoffsets[i]
end = GMAPoffsets[i + 1]
self.GMAPs.append(data[start:end])
pos = endPos
endPos = pos + (self.numGlyplets + 1) * 4
glyphletOffsets = array.array("I")
glyphletOffsets.frombytes(newData[pos:endPos])
if sys.byteorder != "big":
glyphletOffsets.byteswap()
self.glyphlets = []
for i in range(self.numGlyplets):
start = glyphletOffsets[i]
end = glyphletOffsets[i + 1]
self.glyphlets.append(data[start:end])
def compile(self, ttFont):
self.numGMAPs = len(self.GMAPs)
self.numGlyplets = len(self.glyphlets)
GMAPoffsets = [0] * (self.numGMAPs + 1)
glyphletOffsets = [0] * (self.numGlyplets + 1)
dataList = [sstruct.pack(GPKGFormat, self)]
pos = len(dataList[0]) + (self.numGMAPs + 1) * 4 + (self.numGlyplets + 1) * 4
GMAPoffsets[0] = pos
for i in range(1, self.numGMAPs + 1):
pos += len(self.GMAPs[i - 1])
GMAPoffsets[i] = pos
gmapArray = array.array("I", GMAPoffsets)
if sys.byteorder != "big":
gmapArray.byteswap()
dataList.append(gmapArray.tobytes())
glyphletOffsets[0] = pos
for i in range(1, self.numGlyplets + 1):
pos += len(self.glyphlets[i - 1])
glyphletOffsets[i] = pos
glyphletArray = array.array("I", glyphletOffsets)
if sys.byteorder != "big":
glyphletArray.byteswap()
dataList.append(glyphletArray.tobytes())
dataList += self.GMAPs
dataList += self.glyphlets
data = bytesjoin(dataList)
return data
def toXML(self, writer, ttFont):
writer.comment("Most of this table will be recalculated by the compiler")
writer.newline()
formatstring, names, fixes = sstruct.getformat(GPKGFormat)
for name in names:
value = getattr(self, name)
writer.simpletag(name, value=value)
writer.newline()
writer.begintag("GMAPs")
writer.newline()
for gmapData in self.GMAPs:
writer.begintag("hexdata")
writer.newline()
writer.dumphex(gmapData)
writer.endtag("hexdata")
writer.newline()
writer.endtag("GMAPs")
writer.newline()
writer.begintag("glyphlets")
writer.newline()
for glyphletData in self.glyphlets:
writer.begintag("hexdata")
writer.newline()
writer.dumphex(glyphletData)
writer.endtag("hexdata")
writer.newline()
writer.endtag("glyphlets")
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name == "GMAPs":
if not hasattr(self, "GMAPs"):
self.GMAPs = []
for element in content:
if isinstance(element, str):
continue
itemName, itemAttrs, itemContent = element
if itemName == "hexdata":
self.GMAPs.append(readHex(itemContent))
elif name == "glyphlets":
if not hasattr(self, "glyphlets"):
self.glyphlets = []
for element in content:
if isinstance(element, str):
continue
itemName, itemAttrs, itemContent = element
if itemName == "hexdata":
self.glyphlets.append(readHex(itemContent))
else:
setattr(self, name, safeEval(attrs["value"]))
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