79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
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import DefaultTable
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import sstruct
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from fontTools.misc.textTools import safeEval
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hheaFormat = """
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> # big endian
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tableVersion: 16.16F
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ascent: h
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descent: h
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lineGap: h
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advanceWidthMax: H
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minLeftSideBearing: h
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minRightSideBearing: h
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xMaxExtent: h
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caretSlopeRise: h
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caretSlopeRun: h
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reserved0: h
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reserved1: h
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reserved2: h
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reserved3: h
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reserved4: h
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metricDataFormat: h
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numberOfHMetrics: H
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"""
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class table__h_h_e_a(DefaultTable.DefaultTable):
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dependencies = ['hmtx', 'glyf']
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def decompile(self, data, ttFont):
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sstruct.unpack(hheaFormat, data, self)
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def compile(self, ttFont):
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self.recalc(ttFont)
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return sstruct.pack(hheaFormat, self)
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def recalc(self, ttFont):
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hmtxTable = ttFont['hmtx']
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if ttFont.has_key('glyf'):
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if not ttFont.isLoaded('glyf'):
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return
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glyfTable = ttFont['glyf']
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advanceWidthMax = -100000 # arbitrary big negative number
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minLeftSideBearing = 100000 # arbitrary big number
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minRightSideBearing = 100000 # arbitrary big number
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xMaxExtent = -100000 # arbitrary big negative number
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for name in ttFont.getGlyphOrder():
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width, lsb = hmtxTable[name]
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g = glyfTable[name]
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if g.numberOfContours <= 0:
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continue
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advanceWidthMax = max(advanceWidthMax, width)
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minLeftSideBearing = min(minLeftSideBearing, lsb)
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rsb = width - lsb - (g.xMax - g.xMin)
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minRightSideBearing = min(minRightSideBearing, rsb)
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extent = lsb + (g.xMax - g.xMin)
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xMaxExtent = max(xMaxExtent, extent)
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self.advanceWidthMax = advanceWidthMax
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self.minLeftSideBearing = minLeftSideBearing
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self.minRightSideBearing = minRightSideBearing
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self.xMaxExtent = xMaxExtent
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else:
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# XXX CFF recalc...
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pass
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def toXML(self, writer, ttFont):
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formatstring, names, fixes = sstruct.getformat(hheaFormat)
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for name in names:
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value = getattr(self, name)
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if type(value) == type(0L):
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value = int(value)
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writer.simpletag(name, value=value)
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writer.newline()
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def fromXML(self, (name, attrs, content), ttFont):
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setattr(self, name, safeEval(attrs["value"]))
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