7007a08545
git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@238 4cde692c-a291-49d1-8350-778aa11640f8
288 lines
8.2 KiB
Python
288 lines
8.2 KiB
Python
from types import TupleType
|
|
from fontTools.misc.textTools import safeEval
|
|
|
|
|
|
def buildConverters(tableSpec, tableNamespace):
|
|
"""Given a table spec from otData.py, build a converter object for each
|
|
field of the table. This is called for each table in otData.py, and
|
|
the results are assigned to the corresponding class in otTables.py."""
|
|
converters = []
|
|
convertersByName = {}
|
|
for tp, name, repeat, repeatOffset, descr in tableSpec:
|
|
if name.startswith("ValueFormat"):
|
|
assert tp == "uint16"
|
|
converterClass = ValueFormat
|
|
elif name == "DeltaValue":
|
|
assert tp == "uint16"
|
|
converterClass = DeltaValue
|
|
elif name.endswith("Count"):
|
|
assert tp == "uint16"
|
|
converterClass = Count
|
|
elif name == "SubTable":
|
|
converterClass = SubTable
|
|
else:
|
|
converterClass = converterMapping[tp]
|
|
tableClass = tableNamespace.get(name)
|
|
conv = converterClass(name, repeat, repeatOffset, tableClass)
|
|
if name == "SubTable":
|
|
conv.lookupTypes = tableNamespace['lookupTypes']
|
|
# also create reverse mapping
|
|
for t in conv.lookupTypes.values():
|
|
for cls in t.values():
|
|
convertersByName[cls.__name__] = Table("SubTable", repeat, repeatOffset, cls)
|
|
converters.append(conv)
|
|
assert not convertersByName.has_key(name)
|
|
convertersByName[name] = conv
|
|
return converters, convertersByName
|
|
|
|
|
|
class BaseConverter:
|
|
|
|
"""Base class for converter objects. Apart from the constructor, this
|
|
is an abstract class."""
|
|
|
|
def __init__(self, name, repeat, repeatOffset, tableClass):
|
|
self.name = name
|
|
self.repeat = repeat
|
|
self.repeatOffset = repeatOffset
|
|
self.tableClass = tableClass
|
|
self.isCount = name.endswith("Count")
|
|
|
|
def read(self, reader, font, tableStack):
|
|
"""Read a value from the reader."""
|
|
raise NotImplementedError, self
|
|
|
|
def write(self, writer, font, tableStack, value):
|
|
"""Write a value to the writer."""
|
|
raise NotImplementedError, self
|
|
|
|
def xmlRead(self, attrs, content, font):
|
|
"""Read a value from XML."""
|
|
raise NotImplementedError, self
|
|
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
"""Write a value to XML."""
|
|
raise NotImplementedError, self
|
|
|
|
|
|
class SimpleValue(BaseConverter):
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
xmlWriter.simpletag(name, attrs + [("value", value)])
|
|
xmlWriter.newline()
|
|
def xmlRead(self, attrs, content, font):
|
|
return attrs["value"]
|
|
|
|
class IntValue(SimpleValue):
|
|
def xmlRead(self, attrs, content, font):
|
|
return int(attrs["value"])
|
|
|
|
class Long(IntValue):
|
|
def read(self, reader, font, tableStack):
|
|
return reader.readLong()
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeLong(value)
|
|
|
|
class Fixed(IntValue):
|
|
def read(self, reader, font, tableStack):
|
|
return float(reader.readLong()) / 0x10000
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeLong(int(round(value * 0x10000)))
|
|
def xmlRead(self, attrs, content, font):
|
|
return float(attrs["value"])
|
|
|
|
class Short(IntValue):
|
|
def read(self, reader, font, tableStack):
|
|
return reader.readShort()
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeShort(value)
|
|
|
|
class UShort(IntValue):
|
|
def read(self, reader, font, tableStack):
|
|
return reader.readUShort()
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeUShort(value)
|
|
|
|
class Count(Short):
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
xmlWriter.comment("%s=%s" % (name, value))
|
|
xmlWriter.newline()
|
|
|
|
class Tag(SimpleValue):
|
|
def read(self, reader, font, tableStack):
|
|
return reader.readTag()
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeTag(value)
|
|
|
|
class GlyphID(SimpleValue):
|
|
def read(self, reader, font, tableStack):
|
|
return font.getGlyphName(reader.readUShort())
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeUShort(font.getGlyphID(value))
|
|
|
|
|
|
class Struct(BaseConverter):
|
|
|
|
def read(self, reader, font, tableStack):
|
|
table = self.tableClass()
|
|
table.decompile(reader, font, tableStack)
|
|
return table
|
|
|
|
def write(self, writer, font, tableStack, value):
|
|
value.compile(writer, font, tableStack)
|
|
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
if value is None:
|
|
pass # NULL table, ignore
|
|
else:
|
|
value.toXML(xmlWriter, font, attrs)
|
|
|
|
def xmlRead(self, attrs, content, font):
|
|
table = self.tableClass()
|
|
Format = attrs.get("Format")
|
|
if Format is not None:
|
|
table.Format = int(Format)
|
|
for element in content:
|
|
if type(element) <> TupleType:
|
|
continue
|
|
name, attrs, content = element
|
|
table.fromXML((name, attrs, content), font)
|
|
return table
|
|
|
|
|
|
class Table(Struct):
|
|
|
|
def read(self, reader, font, tableStack):
|
|
offset = reader.readUShort()
|
|
if offset == 0:
|
|
return None
|
|
if offset <= 3:
|
|
# XXX hack to work around buggy pala.ttf
|
|
print "*** Warning: offset is not 0, yet suspiciously low (%s). table: %s" \
|
|
% (offset, self.tableClass.__name__)
|
|
return None
|
|
subReader = reader.getSubReader(offset)
|
|
table = self.tableClass()
|
|
table.decompile(subReader, font, tableStack)
|
|
return table
|
|
|
|
def write(self, writer, font, tableStack, value):
|
|
if value is None:
|
|
writer.writeUShort(0)
|
|
else:
|
|
subWriter = writer.getSubWriter()
|
|
writer.writeSubTable(subWriter)
|
|
value.compile(subWriter, font, tableStack)
|
|
|
|
|
|
class SubTable(Table):
|
|
def getConverter(self, tableType, lookupType):
|
|
lookupTypes = self.lookupTypes[tableType]
|
|
tableClass = lookupTypes[lookupType]
|
|
return Table(self.name, self.repeat, self.repeatOffset, tableClass)
|
|
|
|
|
|
class ValueFormat(IntValue):
|
|
def __init__(self, name, repeat, repeatOffset, tableClass):
|
|
BaseConverter.__init__(self, name, repeat, repeatOffset, tableClass)
|
|
self.which = name[-1] == "2"
|
|
def read(self, reader, font, tableStack):
|
|
format = reader.readUShort()
|
|
reader.setValueFormat(format, self.which)
|
|
return format
|
|
def write(self, writer, font, tableStack, format):
|
|
writer.writeUShort(format)
|
|
writer.setValueFormat(format, self.which)
|
|
|
|
|
|
class ValueRecord(ValueFormat):
|
|
def read(self, reader, font, tableStack):
|
|
return reader.readValueRecord(font, self.which)
|
|
def write(self, writer, font, tableStack, value):
|
|
writer.writeValueRecord(value, font, self.which)
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
if value is None:
|
|
pass # NULL table, ignore
|
|
else:
|
|
value.toXML(xmlWriter, font, self.name, attrs)
|
|
def xmlRead(self, attrs, content, font):
|
|
from otBase import ValueRecord
|
|
value = ValueRecord()
|
|
value.fromXML((None, attrs, content), font)
|
|
return value
|
|
|
|
|
|
class DeltaValue(BaseConverter):
|
|
|
|
def read(self, reader, font, tableStack):
|
|
table = tableStack.getTop()
|
|
StartSize = table["StartSize"]
|
|
EndSize = table["EndSize"]
|
|
DeltaFormat = table["DeltaFormat"]
|
|
assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
|
|
nItems = EndSize - StartSize + 1
|
|
nBits = 1 << DeltaFormat
|
|
minusOffset = 1 << nBits
|
|
mask = (1 << nBits) - 1
|
|
signMask = 1 << (nBits - 1)
|
|
|
|
DeltaValue = []
|
|
tmp, shift = 0, 0
|
|
for i in range(nItems):
|
|
if shift == 0:
|
|
tmp, shift = reader.readUShort(), 16
|
|
shift = shift - nBits
|
|
value = (tmp >> shift) & mask
|
|
if value & signMask:
|
|
value = value - minusOffset
|
|
DeltaValue.append(value)
|
|
return DeltaValue
|
|
|
|
def write(self, writer, font, tableStack, value):
|
|
table = tableStack.getTop()
|
|
StartSize = table["StartSize"]
|
|
EndSize = table["EndSize"]
|
|
DeltaFormat = table["DeltaFormat"]
|
|
DeltaValue = table["DeltaValue"]
|
|
assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
|
|
nItems = EndSize - StartSize + 1
|
|
nBits = 1 << DeltaFormat
|
|
assert len(DeltaValue) == nItems
|
|
mask = (1 << nBits) - 1
|
|
|
|
tmp, shift = 0, 16
|
|
for value in DeltaValue:
|
|
shift = shift - nBits
|
|
tmp = tmp | ((value & mask) << shift)
|
|
if shift == 0:
|
|
writer.writeUShort(tmp)
|
|
tmp, shift = 0, 16
|
|
if shift <> 16:
|
|
writer.writeUShort(tmp)
|
|
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
# XXX this could do with a nicer format
|
|
xmlWriter.simpletag(name, attrs + [("value", value)])
|
|
xmlWriter.newline()
|
|
|
|
def xmlRead(self, attrs, content, font):
|
|
return safeEval(attrs["value"])
|
|
|
|
|
|
converterMapping = {
|
|
# type class
|
|
"int16": Short,
|
|
"uint16": UShort,
|
|
"ULONG": Long,
|
|
"Fixed": Fixed,
|
|
"Tag": Tag,
|
|
"GlyphID": GlyphID,
|
|
"struct": Struct,
|
|
"Offset": Table,
|
|
"ValueRecord": ValueRecord,
|
|
}
|
|
|
|
# equivalents:
|
|
converterMapping["USHORT"] = converterMapping["uint16"]
|
|
converterMapping["fixed32"] = converterMapping["Fixed"]
|
|
|