511 lines
15 KiB
Python
511 lines
15 KiB
Python
from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools.misc.textTools import safeEval
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from fontTools.misc.fixedTools import fixedToFloat as fi2fl, floatToFixed as fl2fi
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from .otBase import ValueRecordFactory
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import logging
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log = logging.getLogger(__name__)
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def buildConverters(tableSpec, tableNamespace):
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"""Given a table spec from otData.py, build a converter object for each
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field of the table. This is called for each table in otData.py, and
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the results are assigned to the corresponding class in otTables.py."""
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converters = []
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convertersByName = {}
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for tp, name, repeat, aux, descr in tableSpec:
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tableName = name
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if name.startswith("ValueFormat"):
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assert tp == "uint16"
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converterClass = ValueFormat
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elif name.endswith("Count") or name.endswith("LookupType"):
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assert tp == "uint16"
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converterClass = ComputedUShort
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elif name == "SubTable":
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converterClass = SubTable
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elif name == "ExtSubTable":
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converterClass = ExtSubTable
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elif name == "FeatureParams":
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converterClass = FeatureParams
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else:
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if not tp in converterMapping:
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tableName = tp
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converterClass = Struct
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else:
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converterClass = converterMapping[tp]
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tableClass = tableNamespace.get(tableName)
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conv = converterClass(name, repeat, aux, tableClass)
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if name in ["SubTable", "ExtSubTable"]:
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conv.lookupTypes = tableNamespace['lookupTypes']
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# also create reverse mapping
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for t in conv.lookupTypes.values():
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for cls in t.values():
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convertersByName[cls.__name__] = Table(name, repeat, aux, cls)
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if name == "FeatureParams":
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conv.featureParamTypes = tableNamespace['featureParamTypes']
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conv.defaultFeatureParams = tableNamespace['FeatureParams']
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for cls in conv.featureParamTypes.values():
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convertersByName[cls.__name__] = Table(name, repeat, aux, cls)
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converters.append(conv)
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assert name not in convertersByName, name
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convertersByName[name] = conv
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return converters, convertersByName
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class _MissingItem(tuple):
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__slots__ = ()
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try:
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from collections import UserList
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except:
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from UserList import UserList
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class _LazyList(UserList):
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def __getslice__(self, i, j):
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return self.__getitem__(slice(i, j))
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def __getitem__(self, k):
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if isinstance(k, slice):
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indices = range(*k.indices(len(self)))
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return [self[i] for i in indices]
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item = self.data[k]
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if isinstance(item, _MissingItem):
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self.reader.seek(self.pos + item[0] * self.recordSize)
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item = self.conv.read(self.reader, self.font, {})
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self.data[k] = item
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return item
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class BaseConverter(object):
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"""Base class for converter objects. Apart from the constructor, this
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is an abstract class."""
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def __init__(self, name, repeat, aux, tableClass):
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self.name = name
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self.repeat = repeat
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self.aux = aux
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self.tableClass = tableClass
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self.isCount = name.endswith("Count")
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self.isLookupType = name.endswith("LookupType")
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self.isPropagated = name in ["ClassCount", "Class2Count", "FeatureTag", "SettingsCount", "AxisCount"]
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def readArray(self, reader, font, tableDict, count):
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"""Read an array of values from the reader."""
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lazy = font.lazy and count > 8
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if lazy:
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recordSize = self.getRecordSize(reader)
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if recordSize is NotImplemented:
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lazy = False
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if not lazy:
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l = []
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for i in range(count):
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l.append(self.read(reader, font, tableDict))
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return l
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else:
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l = _LazyList()
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l.reader = reader.copy()
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l.pos = l.reader.pos
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l.font = font
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l.conv = self
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l.recordSize = recordSize
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l.extend(_MissingItem([i]) for i in range(count))
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reader.advance(count * recordSize)
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return l
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def getRecordSize(self, reader):
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if hasattr(self, 'staticSize'): return self.staticSize
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return NotImplemented
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def read(self, reader, font, tableDict):
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"""Read a value from the reader."""
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raise NotImplementedError(self)
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def writeArray(self, writer, font, tableDict, values):
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for i, value in enumerate(values):
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self.write(writer, font, tableDict, value, i)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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"""Write a value to the writer."""
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raise NotImplementedError(self)
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def xmlRead(self, attrs, content, font):
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"""Read a value from XML."""
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raise NotImplementedError(self)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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"""Write a value to XML."""
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raise NotImplementedError(self)
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class SimpleValue(BaseConverter):
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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def xmlRead(self, attrs, content, font):
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return attrs["value"]
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class IntValue(SimpleValue):
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def xmlRead(self, attrs, content, font):
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return int(attrs["value"], 0)
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class Long(IntValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return reader.readLong()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeLong(value)
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class ULong(IntValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return reader.readULong()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeULong(value)
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class Short(IntValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return reader.readShort()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeShort(value)
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class UShort(IntValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return reader.readUShort()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUShort(value)
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class Int8(IntValue):
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staticSize = 1
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def read(self, reader, font, tableDict):
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return reader.readInt8()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeInt8(value)
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class UInt8(IntValue):
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staticSize = 1
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def read(self, reader, font, tableDict):
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return reader.readUInt8()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUInt8(value)
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class UInt24(IntValue):
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staticSize = 3
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def read(self, reader, font, tableDict):
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return reader.readUInt24()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUInt24(value)
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class ComputedUShort(UShort):
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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xmlWriter.comment("%s=%s" % (name, value))
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xmlWriter.newline()
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class Tag(SimpleValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return reader.readTag()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeTag(value)
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class GlyphID(SimpleValue):
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staticSize = 2
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def readArray(self, reader, font, tableDict, count):
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glyphOrder = font.getGlyphOrder()
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gids = reader.readUShortArray(count)
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try:
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l = [glyphOrder[gid] for gid in gids]
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except IndexError:
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# Slower, but will not throw an IndexError on an invalid glyph id.
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l = [font.getGlyphName(gid) for gid in gids]
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return l
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def read(self, reader, font, tableDict):
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return font.getGlyphName(reader.readUShort())
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUShort(font.getGlyphID(value))
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class FloatValue(SimpleValue):
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def xmlRead(self, attrs, content, font):
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return float(attrs["value"])
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class DeciPoints(FloatValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return reader.readUShort() / 10
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUShort(int(round(value * 10)))
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class Fixed(FloatValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return fi2fl(reader.readLong(), 16)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeLong(fl2fi(value, 16))
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class F2Dot14(FloatValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return fi2fl(reader.readShort(), 14)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeShort(fl2fi(value, 14))
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class Version(BaseConverter):
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staticSize = 4
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def read(self, reader, font, tableDict):
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value = reader.readLong()
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assert (value >> 16) == 1, "Unsupported version 0x%08x" % value
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return fi2fl(value, 16)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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if value < 0x10000:
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value = fl2fi(value, 16)
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value = int(round(value))
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assert (value >> 16) == 1, "Unsupported version 0x%08x" % value
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writer.writeLong(value)
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def xmlRead(self, attrs, content, font):
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value = attrs["value"]
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value = float(int(value, 0)) if value.startswith("0") else float(value)
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if value >= 0x10000:
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value = fi2fl(value, 16)
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return value
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value >= 0x10000:
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value = fi2fl(value, 16)
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if value % 1 != 0:
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# Write as hex
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value = "0x%08x" % fl2fi(value, 16)
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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class Struct(BaseConverter):
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def getRecordSize(self, reader):
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return self.tableClass and self.tableClass.getRecordSize(reader)
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def read(self, reader, font, tableDict):
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table = self.tableClass()
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table.decompile(reader, font)
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return table
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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value.compile(writer, font)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value is None:
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if attrs:
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# If there are attributes (probably index), then
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# don't drop this even if it's NULL. It will mess
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# up the array indices of the containing element.
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xmlWriter.simpletag(name, attrs + [("empty", 1)])
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xmlWriter.newline()
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else:
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pass # NULL table, ignore
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else:
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value.toXML(xmlWriter, font, attrs, name=name)
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def xmlRead(self, attrs, content, font):
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if "empty" in attrs and safeEval(attrs["empty"]):
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return None
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table = self.tableClass()
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Format = attrs.get("Format")
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if Format is not None:
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table.Format = int(Format)
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for element in content:
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if isinstance(element, tuple):
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name, attrs, content = element
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table.fromXML(name, attrs, content, font)
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else:
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pass
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# TODO Fill in items that are not set by XML.
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return table
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def __repr__(self):
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return "Struct of " + repr(self.tableClass)
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class Table(Struct):
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longOffset = False
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staticSize = 2
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def readOffset(self, reader):
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return reader.readUShort()
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def writeNullOffset(self, writer):
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if self.longOffset:
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writer.writeULong(0)
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else:
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writer.writeUShort(0)
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def read(self, reader, font, tableDict):
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offset = self.readOffset(reader)
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if offset == 0:
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return None
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if offset <= 3:
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# XXX hack to work around buggy pala.ttf
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log.warning("offset is not 0, yet suspiciously low (%d). table: %s",
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offset, self.tableClass.__name__)
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return None
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table = self.tableClass()
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reader = reader.getSubReader(offset)
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if font.lazy:
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table.reader = reader
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table.font = font
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else:
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table.decompile(reader, font)
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return table
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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if value is None:
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self.writeNullOffset(writer)
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else:
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subWriter = writer.getSubWriter()
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subWriter.longOffset = self.longOffset
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subWriter.name = self.name
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if repeatIndex is not None:
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subWriter.repeatIndex = repeatIndex
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writer.writeSubTable(subWriter)
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value.compile(subWriter, font)
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class LTable(Table):
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longOffset = True
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staticSize = 4
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def readOffset(self, reader):
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return reader.readULong()
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class SubTable(Table):
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def getConverter(self, tableType, lookupType):
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tableClass = self.lookupTypes[tableType][lookupType]
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return self.__class__(self.name, self.repeat, self.aux, tableClass)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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Table.xmlWrite(self, xmlWriter, font, value, None, attrs)
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class ExtSubTable(LTable, SubTable):
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.Extension = True # actually, mere presence of the field flags it as an Ext Subtable writer.
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Table.write(self, writer, font, tableDict, value, repeatIndex)
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class FeatureParams(Table):
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def getConverter(self, featureTag):
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tableClass = self.featureParamTypes.get(featureTag, self.defaultFeatureParams)
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return self.__class__(self.name, self.repeat, self.aux, tableClass)
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class ValueFormat(IntValue):
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staticSize = 2
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def __init__(self, name, repeat, aux, tableClass):
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BaseConverter.__init__(self, name, repeat, aux, tableClass)
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self.which = "ValueFormat" + ("2" if name[-1] == "2" else "1")
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def read(self, reader, font, tableDict):
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format = reader.readUShort()
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reader[self.which] = ValueRecordFactory(format)
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return format
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def write(self, writer, font, tableDict, format, repeatIndex=None):
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writer.writeUShort(format)
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writer[self.which] = ValueRecordFactory(format)
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class ValueRecord(ValueFormat):
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def getRecordSize(self, reader):
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return 2 * len(reader[self.which])
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def read(self, reader, font, tableDict):
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return reader[self.which].readValueRecord(reader, font)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer[self.which].writeValueRecord(writer, font, value)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value is None:
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pass # NULL table, ignore
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else:
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value.toXML(xmlWriter, font, self.name, attrs)
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def xmlRead(self, attrs, content, font):
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from .otBase import ValueRecord
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value = ValueRecord()
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value.fromXML(None, attrs, content, font)
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return value
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class DeltaValue(BaseConverter):
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def read(self, reader, font, tableDict):
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StartSize = tableDict["StartSize"]
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EndSize = tableDict["EndSize"]
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DeltaFormat = tableDict["DeltaFormat"]
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assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
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nItems = EndSize - StartSize + 1
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nBits = 1 << DeltaFormat
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minusOffset = 1 << nBits
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mask = (1 << nBits) - 1
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signMask = 1 << (nBits - 1)
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DeltaValue = []
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tmp, shift = 0, 0
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for i in range(nItems):
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if shift == 0:
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tmp, shift = reader.readUShort(), 16
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shift = shift - nBits
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value = (tmp >> shift) & mask
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if value & signMask:
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value = value - minusOffset
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DeltaValue.append(value)
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return DeltaValue
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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StartSize = tableDict["StartSize"]
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EndSize = tableDict["EndSize"]
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DeltaFormat = tableDict["DeltaFormat"]
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DeltaValue = value
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assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
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nItems = EndSize - StartSize + 1
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nBits = 1 << DeltaFormat
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assert len(DeltaValue) == nItems
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mask = (1 << nBits) - 1
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tmp, shift = 0, 16
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for value in DeltaValue:
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shift = shift - nBits
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tmp = tmp | ((value & mask) << shift)
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if shift == 0:
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writer.writeUShort(tmp)
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tmp, shift = 0, 16
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if shift != 16:
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writer.writeUShort(tmp)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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def xmlRead(self, attrs, content, font):
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return safeEval(attrs["value"])
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converterMapping = {
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# type class
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"int8": Int8,
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"int16": Short,
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"uint8": UInt8,
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"uint8": UInt8,
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"uint16": UShort,
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"uint24": UInt24,
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"uint32": ULong,
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"Version": Version,
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"Tag": Tag,
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"GlyphID": GlyphID,
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"DeciPoints": DeciPoints,
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"Fixed": Fixed,
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"struct": Struct,
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"Offset": Table,
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"LOffset": LTable,
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"ValueRecord": ValueRecord,
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"DeltaValue": DeltaValue,
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}
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