155 lines
4.3 KiB
Python
155 lines
4.3 KiB
Python
from fontTools.ttLib.ttVisitor import TTVisitor
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import fontTools.ttLib as ttLib
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import fontTools.ttLib.tables.otBase as otBase
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import fontTools.ttLib.tables.otTables as otTables
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from fontTools.misc.fixedTools import otRound
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class ScalerVisitor(TTVisitor):
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def __init__(self, scaleFactor):
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self.scaleFactor = scaleFactor
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def scale(self, v):
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return otRound(v * self.scaleFactor)
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@ScalerVisitor.register_attrs(
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(
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(ttLib.getTableClass("head"), ("unitsPerEm", "xMin", "yMin", "xMax", "yMax")),
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(
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ttLib.getTableClass("hhea"),
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(
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"ascent",
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"descent",
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"lineGap",
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"advanceWidthMax",
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"minLeftSideBearing",
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"minRightSideBearing",
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"xMaxExtent",
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),
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),
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(
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ttLib.getTableClass("OS/2"),
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(
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"xAvgCharWidth",
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"ySubscriptXSize",
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"ySubscriptYSize",
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"ySubscriptXOffset",
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"ySubscriptYOffset",
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"ySuperscriptXSize",
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"ySuperscriptYSize",
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"ySuperscriptXOffset",
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"ySuperscriptYOffset",
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"yStrikeoutSize",
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"yStrikeoutPosition",
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"sTypoAscender",
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"sTypoDescender",
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"sTypoLineGap",
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"usWinAscent",
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"usWinDescent",
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"sxHeight",
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"sCapHeight",
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),
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),
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)
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)
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def visit(visitor, obj, attr, value):
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setattr(obj, attr, visitor.scale(value))
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@ScalerVisitor.register_attr(ttLib.getTableClass("hmtx"), "metrics")
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def visit(visitor, obj, attr, metrics):
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for g in metrics:
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advance, lsb = metrics[g]
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metrics[g] = visitor.scale(advance), visitor.scale(lsb)
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@ScalerVisitor.register_attr(ttLib.getTableClass("glyf"), "glyphs")
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def visit(visitor, obj, attr, glyphs):
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for g in glyphs.values():
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if g.isComposite():
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for component in g.components:
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component.x = visitor.scale(component.x)
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component.y = visitor.scale(component.y)
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else:
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for attr in ("xMin", "xMax", "yMin", "yMax"):
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v = getattr(g, attr, None)
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if v is not None:
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setattr(g, attr, visitor.scale(v))
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glyf = visitor.font["glyf"]
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coordinates = g.getCoordinates(glyf)[0]
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for i, (x, y) in enumerate(coordinates):
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coordinates[i] = visitor.scale(x), visitor.scale(y)
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@ScalerVisitor.register_attr(ttLib.getTableClass("gvar"), "variations")
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def visit(visitor, obj, attr, variations):
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for varlist in variations.values():
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for var in varlist:
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coordinates = var.coordinates
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for i, xy in enumerate(coordinates):
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if xy is None:
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continue
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coordinates[i] = visitor.scale(xy[0]), visitor.scale(xy[1])
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@ScalerVisitor.register_attr(ttLib.getTableClass("kern"), "kernTables")
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def visit(visitor, obj, attr, kernTables):
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for table in kernTables:
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kernTable = table.kernTable
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for k in kernTable.keys():
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kernTable[k] = visitor.scale(kernTable[k])
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# GPOS
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@ScalerVisitor.register(otTables.ValueRecord)
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def visit(visitor, obj):
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attrs = ["XAdvance", "YAdvance", "XPlacement", "YPlacement"]
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for attr in attrs:
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v = getattr(obj, attr, None)
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if v is not None:
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v = visitor.scale(v)
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setattr(obj, attr, v)
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@ScalerVisitor.register(otTables.Anchor)
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def visit(visitor, obj):
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attrs = ["XCoordinate", "YCoordinate"]
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for attr in attrs:
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v = getattr(obj, attr)
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v = visitor.scale(v)
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setattr(obj, attr, v)
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# ItemVariationStore
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@ScalerVisitor.register(otTables.VarData)
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def visit(visitor, varData):
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for item in varData.Item:
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for i, v in enumerate(item):
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item[i] = visitor.scale(v)
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if __name__ == "__main__":
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from fontTools.ttLib import TTFont
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import sys
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if len(sys.argv) != 3:
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print("usage: scale-upem.py font new-upem")
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sys.exit()
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font = TTFont(sys.argv[1])
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new_upem = int(sys.argv[2])
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upem = font["head"].unitsPerEm
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visitor = ScalerVisitor(new_upem / upem)
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visitor.visit(font)
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font.save("out.ttf")
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