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from fontTools.misc import sstruct
from fontTools.misc.textTools import bytechr, byteord, strjoin
from . import DefaultTable
import array
from collections.abc import Mapping
hdmxHeaderFormat = """
> # big endian!
version: H
numRecords: H
recordSize: l
"""
class _GlyphnamedList(Mapping):
def __init__(self, reverseGlyphOrder, data):
self._array = data
self._map = dict(reverseGlyphOrder)
def __getitem__(self, k):
return self._array[self._map[k]]
def __len__(self):
return len(self._map)
def __iter__(self):
return iter(self._map)
def keys(self):
return self._map.keys()
class table__h_d_m_x(DefaultTable.DefaultTable):
def decompile(self, data, ttFont):
numGlyphs = ttFont["maxp"].numGlyphs
glyphOrder = ttFont.getGlyphOrder()
dummy, data = sstruct.unpack2(hdmxHeaderFormat, data, self)
self.hdmx = {}
for i in range(self.numRecords):
ppem = byteord(data[0])
maxSize = byteord(data[1])
widths = _GlyphnamedList(
ttFont.getReverseGlyphMap(), array.array("B", data[2 : 2 + numGlyphs])
)
self.hdmx[ppem] = widths
data = data[self.recordSize :]
assert len(data) == 0, "too much hdmx data"
def compile(self, ttFont):
self.version = 0
numGlyphs = ttFont["maxp"].numGlyphs
glyphOrder = ttFont.getGlyphOrder()
self.recordSize = 4 * ((2 + numGlyphs + 3) // 4)
pad = (self.recordSize - 2 - numGlyphs) * b"\0"
self.numRecords = len(self.hdmx)
data = sstruct.pack(hdmxHeaderFormat, self)
items = sorted(self.hdmx.items())
for ppem, widths in items:
data = data + bytechr(ppem) + bytechr(max(widths.values()))
for glyphID in range(len(glyphOrder)):
width = widths[glyphOrder[glyphID]]
data = data + bytechr(width)
data = data + pad
return data
def toXML(self, writer, ttFont):
writer.begintag("hdmxData")
writer.newline()
ppems = sorted(self.hdmx.keys())
records = []
format = ""
for ppem in ppems:
widths = self.hdmx[ppem]
records.append(widths)
format = format + "%4d"
glyphNames = ttFont.getGlyphOrder()[:]
glyphNames.sort()
maxNameLen = max(map(len, glyphNames))
format = "%" + repr(maxNameLen) + "s:" + format + " ;"
writer.write(format % (("ppem",) + tuple(ppems)))
writer.newline()
writer.newline()
for glyphName in glyphNames:
row = []
for ppem in ppems:
widths = self.hdmx[ppem]
row.append(widths[glyphName])
if ";" in glyphName:
glyphName = "\\x3b".join(glyphName.split(";"))
writer.write(format % ((glyphName,) + tuple(row)))
writer.newline()
writer.endtag("hdmxData")
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name != "hdmxData":
return
content = strjoin(content)
lines = content.split(";")
topRow = lines[0].split()
assert topRow[0] == "ppem:", "illegal hdmx format"
ppems = list(map(int, topRow[1:]))
self.hdmx = hdmx = {}
for ppem in ppems:
hdmx[ppem] = {}
lines = (line.split() for line in lines[1:])
for line in lines:
if not line:
continue
assert line[0][-1] == ":", "illegal hdmx format"
glyphName = line[0][:-1]
if "\\" in glyphName:
from fontTools.misc.textTools import safeEval
glyphName = safeEval('"""' + glyphName + '"""')
line = list(map(int, line[1:]))
assert len(line) == len(ppems), "illegal hdmx format"
for i in range(len(ppems)):
hdmx[ppems[i]][glyphName] = line[i]
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