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Initial sbix support from Jens Kutilek

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This commit is contained in:
Behdad Esfahbod 2013-12-06 19:35:09 -05:00
parent d0a85754fe
commit f1394f3fdd
3 changed files with 374 additions and 0 deletions
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139
Lib/fontTools/ttLib/tables/_s_b_i_x.py Normal file
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import DefaultTable
import struct, sstruct
#from fontTools.misc.textTools import readHex
from types import TupleType
from sbixBitmapSet import *
from sbixBitmap import *
"""
sbix Table organization:
USHORT version?
USHORT version?
USHORT count number of bitmap sets
offsetEntry offsetEntry[count] offsetEntries
(Variable) storage for bitmap sets
offsetEntry:
ULONG offset offset from table start to bitmap set
bitmap set:
USHORT size height and width in pixels
USHORT resolution ?
offsetRecord offsetRecord[]
(Variable) storage for bitmaps
offsetRecord:
ULONG bitmapOffset offset from start of bitmap set to individual bitmap
bitmap:
ULONG reserved 00 00 00 00
char[4] format data type, e.g. "png "
(Variable) bitmap data
"""
sbixHeaderFormat = """
>
usVal1: H # 00 01
usVal2: H # 00 01
numSets: L # 00 00 00 02 # number of bitmap sets
"""
sbixHeaderFormatSize = sstruct.calcsize(sbixHeaderFormat)
sbixBitmapSetOffsetFormat = """
>
offset: L # 00 00 00 10 # offset from table start to each bitmap set
"""
sbixBitmapSetOffsetFormatSize = sstruct.calcsize(sbixBitmapSetOffsetFormat)
class table__s_b_i_x(DefaultTable.DefaultTable):
def __init__(self, tag):
self.tableTag = tag
self.usVal1 = 1
self.usVal2 = 1
self.numSets = 0
self.bitmapSets = {}
self.bitmapSetOffsets = []
def decompile(self, data, ttFont):
# read table header
sstruct.unpack(sbixHeaderFormat, data[ : sbixHeaderFormatSize], self)
# collect offsets to individual bitmap sets in self.bitmapSetOffsets
for i in range(self.numSets):
myOffset = sbixHeaderFormatSize + i * sbixBitmapSetOffsetFormatSize
offsetEntry = sbixBitmapSetOffset()
sstruct.unpack(sbixBitmapSetOffsetFormat, \
data[myOffset : myOffset+sbixBitmapSetOffsetFormatSize], \
offsetEntry)
self.bitmapSetOffsets.append(offsetEntry.offset)
# decompile BitmapSets
for i in range(self.numSets-1, -1, -1):
myBitmapSet = BitmapSet(rawdata=data[self.bitmapSetOffsets[i]:])
data = data[:self.bitmapSetOffsets[i]]
myBitmapSet.decompile(ttFont)
#print " BitmapSet length: %xh" % len(bitmapSetData)
#print "Number of Bitmaps:", myBitmapSet.numBitmaps
if myBitmapSet.size in self.bitmapSets:
from fontTools import ttLib
raise(ttLib.TTLibError, "Pixel 'size' must be unique for each BitmapSet")
self.bitmapSets[myBitmapSet.size] = myBitmapSet
# after the bitmaps have been extracted, we don't need the offsets anymore
del self.bitmapSetOffsets
def compile(self, ttFont):
sbixData = ""
self.numSets = len(self.bitmapSets)
sbixHeader = sstruct.pack(sbixHeaderFormat, self)
# calculate offset to start of first bitmap set
setOffset = sbixHeaderFormatSize + sbixBitmapSetOffsetFormatSize * self.numSets
for si in sorted(self.bitmapSets.keys()):
myBitmapSet = self.bitmapSets[si]
myBitmapSet.compile(ttFont)
# append offset to this bitmap set to table header
myBitmapSet.offset = setOffset
sbixHeader += sstruct.pack(sbixBitmapSetOffsetFormat, myBitmapSet)
setOffset += sbixBitmapSetHeaderFormatSize + len(myBitmapSet.data)
sbixData += myBitmapSet.data
return sbixHeader + sbixData
def toXML(self, xmlWriter, ttFont):
xmlWriter.simpletag("usVal1", value=self.usVal1)
xmlWriter.newline()
xmlWriter.simpletag("usVal2", value=self.usVal2)
xmlWriter.newline()
for i in sorted(self.bitmapSets.keys()):
self.bitmapSets[i].toXML(xmlWriter, ttFont)
def fromXML(self, (name, attrs, content), ttFont):
if name in ["usVal1", "usVal2"]:
setattr(self, name, int(attrs["value"]))
elif name == "bitmapSet":
myBitmapSet = BitmapSet()
for element in content:
if type(element) == TupleType:
myBitmapSet.fromXML(element, ttFont)
self.bitmapSets[myBitmapSet.size] = myBitmapSet
else:
from fontTools import ttLib
raise ttLib.TTLibError, "can't handle '%s' element" % name
# Helper classes
class sbixBitmapSetOffset(object):
pass

100
Lib/fontTools/ttLib/tables/sbixBitmap.py Normal file
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import struct, sstruct
from fontTools.misc.textTools import readHex
sbixBitmapHeaderFormat = """
>
usReserved1: H # 00 00
usReserved2: H # 00 00
imageFormatTag: 4s # e.g. "png "
"""
sbixBitmapHeaderFormatSize = sstruct.calcsize(sbixBitmapHeaderFormat)
class Bitmap(object):
def __init__(self, glyphName=None, referenceGlyphName=None, usReserved1=0, usReserved2=0, imageFormatTag=None, imageData=None, rawdata=None, gid=0):
self.gid = gid
self.glyphName = glyphName
self.referenceGlyphName = referenceGlyphName
self.usReserved1 = usReserved1
self.usReserved2 = usReserved2
self.rawdata = rawdata
self.imageFormatTag = imageFormatTag
self.imageData = imageData
def decompile(self, ttFont):
self.glyphName = ttFont.getGlyphName(self.gid)
if self.rawdata is None:
from fontTools import ttLib
raise(ttLib.TTLibError, "No table data to decompile.")
if len(self.rawdata) > 0:
if len(self.rawdata) < sbixBitmapHeaderFormatSize:
from fontTools import ttLib
#print "Bitmap %i header too short: Expected %x, got %x." % (self.gid, sbixBitmapHeaderFormatSize, len(self.rawdata))
raise(ttLib.TTLibError, "Bitmap header too short.")
sstruct.unpack(sbixBitmapHeaderFormat, self.rawdata[:sbixBitmapHeaderFormatSize], self)
if self.imageFormatTag == "dupe":
# bitmap is a reference to another glyph's bitmap
gid, = struct.unpack(">H", self.rawdata[sbixBitmapHeaderFormatSize:])
self.referenceGlyphName = ttFont.getGlyphName(gid)
else:
self.imageData = self.rawdata[sbixBitmapHeaderFormatSize:]
self.referenceGlyphName = None
# clean up
del self.rawdata
del self.gid
def compile(self, ttFont):
if self.glyphName is None:
from fontTools import ttLib
raise ttLib.TTLibError, "Can't compile bitmap without glyph name"
# TODO: if ttFont has no maxp, cmap etc., ignore glyph names and compile by index?
# (needed if you just want to compile the sbix table on its own)
self.gid = struct.pack(">H", ttFont.getGlyphID(self.glyphName))
if self.imageFormatTag is None:
self.rawdata = ""
else:
self.rawdata = sstruct.pack(sbixBitmapHeaderFormat, self) + self.imageData
def toXML(self, xmlWriter, ttFont):
if self.imageFormatTag == None:
# TODO: ignore empty bitmaps?
# a bitmap entry is required for each glyph,
# but empty ones can be calculated at compile time
xmlWriter.simpletag("bitmap", glyphname=self.glyphName)
xmlWriter.newline()
return
xmlWriter.begintag("bitmap", format=self.imageFormatTag, glyphname=self.glyphName)
xmlWriter.newline()
#xmlWriter.simpletag("usReserved1", value=self.usReserved1)
#xmlWriter.newline()
#xmlWriter.simpletag("usReserved2", value=self.usReserved2)
#xmlWriter.newline()
if self.imageFormatTag == "dupe":
# format == "dupe" is apparently a reference to another glyph id.
xmlWriter.simpletag("ref", glyphname=self.referenceGlyphName)
else:
xmlWriter.begintag("hexdata")
xmlWriter.newline()
xmlWriter.dumphex(self.imageData)
xmlWriter.endtag("hexdata")
xmlWriter.newline()
xmlWriter.endtag("bitmap")
xmlWriter.newline()
def fromXML(self, (name, attrs, content), ttFont):
#if name in ["usReserved1", "usReserved2"]:
# setattr(self, name, int(attrs["value"]))
#elif
if name == "ref":
# bitmap is a "dupe", i.e. a reference to another bitmap.
# in this case imageData contains the glyph id of the reference glyph
# get glyph id from glyphname
self.imageData = struct.pack(">H", ttFont.getGlyphID(attrs["glyphname"]))
elif name == "hexdata":
self.imageData = readHex(content)
else:
from fontTools import ttLib
raise ttLib.TTLibError, "can't handle '%s' element" % name

135
Lib/fontTools/ttLib/tables/sbixBitmapSet.py Normal file
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import struct, sstruct
from types import TupleType
from sbixBitmap import *
#from fontTools.misc.textTools import hexStr
sbixBitmapSetHeaderFormat = """
>
size: H # 00 28
resolution: H # 00 48
"""
sbixBitmapOffsetEntryFormat = """
>
ulOffset: L # 00 00 07 E0 # Offset from start of first offset entry to each bitmap
"""
sbixBitmapSetHeaderFormatSize = sstruct.calcsize(sbixBitmapSetHeaderFormat)
sbixBitmapOffsetEntryFormatSize = sstruct.calcsize(sbixBitmapOffsetEntryFormat)
class BitmapSet(object):
def __init__(self, rawdata=None, size=0, resolution=72):
self.data = rawdata
self.size = size
self.resolution = resolution
self.bitmaps = {}
def decompile(self, ttFont):
if self.data is None:
from fontTools import ttLib
raise(ttLib.TTLibError, "No table data to decompile.")
if len(self.data) < sbixBitmapSetHeaderFormatSize:
from fontTools import ttLib
raise(ttLib.TTLibError, "BitmapSet header too short: Expected %x, got %x.") \
% (sbixBitmapSetHeaderFormatSize, len(self.data))
# read BitmapSet header from raw data
sstruct.unpack(sbixBitmapSetHeaderFormat, self.data[:sbixBitmapSetHeaderFormatSize], self)
# calculate number of bitmaps
firstBitmapOffset, = struct.unpack(">L", \
self.data[sbixBitmapSetHeaderFormatSize : sbixBitmapSetHeaderFormatSize + sbixBitmapOffsetEntryFormatSize])
self.numBitmaps = (firstBitmapOffset - sbixBitmapSetHeaderFormatSize) / sbixBitmapOffsetEntryFormatSize - 1
# ^ -1 because there's one more offset than bitmaps
# build offset list for single bitmap offsets
self.bitmapOffsets = []
for i in range(self.numBitmaps + 1): # + 1 because there's one more offset than bitmaps
start = i * sbixBitmapOffsetEntryFormatSize + sbixBitmapSetHeaderFormatSize
myOffset, = struct.unpack(">L", self.data[start : start + sbixBitmapOffsetEntryFormatSize])
self.bitmapOffsets.append(myOffset)
# iterate through offset list and slice raw data into bitmaps
for i in range(self.numBitmaps):
myBitmap = Bitmap(rawdata=self.data[self.bitmapOffsets[i] : self.bitmapOffsets[i+1]], gid=i)
myBitmap.decompile(ttFont)
self.bitmaps[myBitmap.glyphName] = myBitmap
del self.bitmapOffsets
del self.data
def compile(self, ttFont):
self.bitmapOffsets = ""
self.bitmapData = ""
glyphOrder = ttFont.getGlyphOrder()
# first bitmap starts right after the header
bitmapOffset = sbixBitmapSetHeaderFormatSize + sbixBitmapOffsetEntryFormatSize * (len(glyphOrder) + 1)
for glyphName in glyphOrder:
if glyphName in self.bitmaps:
# we have a bitmap for this glyph
myBitmap = self.bitmaps[glyphName]
else:
# must add empty bitmap for this glyph
myBitmap = Bitmap(glyphName=glyphName)
myBitmap.compile(ttFont)
myBitmap.ulOffset = bitmapOffset
self.bitmapData += myBitmap.rawdata
bitmapOffset += len(myBitmap.rawdata)
self.bitmapOffsets += sstruct.pack(sbixBitmapOffsetEntryFormat, myBitmap)
# add last "offset", really the end address of the last bitmap
dummy = Bitmap()
dummy.ulOffset = bitmapOffset
self.bitmapOffsets += sstruct.pack(sbixBitmapOffsetEntryFormat, dummy)
# bitmap sets are padded to 4 byte boundaries
dataLength = len(self.bitmapOffsets) + len(self.bitmapData)
if dataLength % 4 != 0:
padding = 4 - (dataLength % 4)
else:
padding = 0
# pack header
self.data = sstruct.pack(sbixBitmapSetHeaderFormat, self)
# add offset, image data and padding after header
self.data += self.bitmapOffsets + self.bitmapData + "\0" * padding
def toXML(self, xmlWriter, ttFont):
xmlWriter.begintag("bitmapSet")
xmlWriter.newline()
xmlWriter.simpletag("size", value=self.size)
xmlWriter.newline()
xmlWriter.simpletag("resolution", value=self.resolution)
xmlWriter.newline()
glyphOrder = ttFont.getGlyphOrder()
for i in range(len(glyphOrder)):
if glyphOrder[i] in self.bitmaps:
self.bitmaps[glyphOrder[i]].toXML(xmlWriter, ttFont)
# TODO: what if there are more bitmaps than glyphs?
xmlWriter.endtag("bitmapSet")
xmlWriter.newline()
def fromXML(self, (name, attrs, content), ttFont):
if name in ["size", "resolution"]:
setattr(self, name, int(attrs["value"]))
elif name == "bitmap":
if attrs.has_key("format"):
myFormat = attrs["format"]
else:
myFormat = None
if attrs.has_key("glyphname"):
myGlyphName = attrs["glyphname"]
else:
from fontTools import ttLib
raise ttLib.TTLibError, "Bitmap must have a glyph name."
myBitmap = Bitmap(glyphName=myGlyphName, imageFormatTag=myFormat)
for element in content:
if type(element) == TupleType:
myBitmap.fromXML(element, ttFont)
myBitmap.compile(ttFont)
self.bitmaps[myBitmap.glyphName] = myBitmap
else:
from fontTools import ttLib
raise ttLib.TTLibError, "can't handle '%s' element" % name