118 lines
4.3 KiB
Python
118 lines
4.3 KiB
Python
from fontTools.misc import sstruct
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from fontTools.misc.textTools import readHex, safeEval
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import struct
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sbixGlyphHeaderFormat = """
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>
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originOffsetX: h # The x-value of the point in the glyph relative to its
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# lower-left corner which corresponds to the origin of
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# the glyph on the screen, that is the point on the
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# baseline at the left edge of the glyph.
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originOffsetY: h # The y-value of the point in the glyph relative to its
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# lower-left corner which corresponds to the origin of
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# the glyph on the screen, that is the point on the
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# baseline at the left edge of the glyph.
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graphicType: 4s # e.g. "png "
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"""
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sbixGlyphHeaderFormatSize = sstruct.calcsize(sbixGlyphHeaderFormat)
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class Glyph(object):
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def __init__(self, glyphName=None, referenceGlyphName=None, originOffsetX=0, originOffsetY=0, graphicType=None, imageData=None, rawdata=None, gid=0):
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self.gid = gid
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self.glyphName = glyphName
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self.referenceGlyphName = referenceGlyphName
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self.originOffsetX = originOffsetX
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self.originOffsetY = originOffsetY
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self.rawdata = rawdata
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self.graphicType = graphicType
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self.imageData = imageData
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# fix self.graphicType if it is null terminated or too short
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if self.graphicType is not None:
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if self.graphicType[-1] == "\0":
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self.graphicType = self.graphicType[:-1]
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if len(self.graphicType) > 4:
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from fontTools import ttLib
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raise ttLib.TTLibError("Glyph.graphicType must not be longer than 4 characters.")
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elif len(self.graphicType) < 4:
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# pad with spaces
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self.graphicType += " "[:(4 - len(self.graphicType))]
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def decompile(self, ttFont):
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self.glyphName = ttFont.getGlyphName(self.gid)
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if self.rawdata is None:
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from fontTools import ttLib
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raise ttLib.TTLibError("No table data to decompile")
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if len(self.rawdata) > 0:
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if len(self.rawdata) < sbixGlyphHeaderFormatSize:
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from fontTools import ttLib
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#print "Glyph %i header too short: Expected %x, got %x." % (self.gid, sbixGlyphHeaderFormatSize, len(self.rawdata))
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raise ttLib.TTLibError("Glyph header too short.")
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sstruct.unpack(sbixGlyphHeaderFormat, self.rawdata[:sbixGlyphHeaderFormatSize], self)
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if self.graphicType == "dupe":
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# this glyph is a reference to another glyph's image data
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gid, = struct.unpack(">H", self.rawdata[sbixGlyphHeaderFormatSize:])
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self.referenceGlyphName = ttFont.getGlyphName(gid)
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else:
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self.imageData = self.rawdata[sbixGlyphHeaderFormatSize:]
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self.referenceGlyphName = None
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# clean up
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del self.rawdata
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del self.gid
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def compile(self, ttFont):
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if self.glyphName is None:
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from fontTools import ttLib
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raise ttLib.TTLibError("Can't compile Glyph without glyph name")
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# TODO: if ttFont has no maxp, cmap etc., ignore glyph names and compile by index?
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# (needed if you just want to compile the sbix table on its own)
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self.gid = struct.pack(">H", ttFont.getGlyphID(self.glyphName))
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if self.graphicType is None:
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self.rawdata = b""
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else:
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self.rawdata = sstruct.pack(sbixGlyphHeaderFormat, self) + self.imageData
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def toXML(self, xmlWriter, ttFont):
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if self.graphicType == None:
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# TODO: ignore empty glyphs?
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# a glyph data entry is required for each glyph,
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# but empty ones can be calculated at compile time
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xmlWriter.simpletag("glyph", name=self.glyphName)
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xmlWriter.newline()
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return
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xmlWriter.begintag("glyph",
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graphicType=self.graphicType,
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name=self.glyphName,
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originOffsetX=self.originOffsetX,
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originOffsetY=self.originOffsetY,
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)
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xmlWriter.newline()
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if self.graphicType == "dupe":
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# graphicType == "dupe" is a reference to another glyph id.
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xmlWriter.simpletag("ref", glyphname=self.referenceGlyphName)
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else:
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xmlWriter.begintag("hexdata")
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xmlWriter.newline()
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xmlWriter.dumphex(self.imageData)
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xmlWriter.endtag("hexdata")
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xmlWriter.newline()
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xmlWriter.endtag("glyph")
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xmlWriter.newline()
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def fromXML(self, name, attrs, content, ttFont):
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if name == "ref":
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# glyph is a "dupe", i.e. a reference to another glyph's image data.
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# in this case imageData contains the glyph id of the reference glyph
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# get glyph id from glyphname
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self.imageData = struct.pack(">H", ttFont.getGlyphID(safeEval("'''" + attrs["glyphname"] + "'''")))
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elif name == "hexdata":
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self.imageData = readHex(content)
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else:
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from fontTools import ttLib
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raise ttLib.TTLibError("can't handle '%s' element" % name)
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