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"""Change the units-per-EM of a font.
AAT and Graphite tables are not supported. CFF/CFF2 fonts
are de-subroutinized."""
from fontTools.ttLib.ttVisitor import TTVisitor
import fontTools.ttLib as ttLib
import fontTools.ttLib.tables.otBase as otBase
import fontTools.ttLib.tables.otTables as otTables
from fontTools.cffLib import VarStoreData
import fontTools.cffLib.specializer as cffSpecializer
from fontTools.varLib import builder # for VarData.calculateNumShorts
from fontTools.varLib.multiVarStore import OnlineMultiVarStoreBuilder
from fontTools.misc.vector import Vector
from fontTools.misc.fixedTools import otRound
from fontTools.misc.iterTools import batched
__all__ = ["scale_upem", "ScalerVisitor"]
class ScalerVisitor(TTVisitor):
def __init__(self, scaleFactor):
self.scaleFactor = scaleFactor
def scale(self, v):
return otRound(v * self.scaleFactor)
@ScalerVisitor.register_attrs(
(
(ttLib.getTableClass("head"), ("unitsPerEm", "xMin", "yMin", "xMax", "yMax")),
(ttLib.getTableClass("post"), ("underlinePosition", "underlineThickness")),
(ttLib.getTableClass("VORG"), ("defaultVertOriginY")),
(
ttLib.getTableClass("hhea"),
(
"ascent",
"descent",
"lineGap",
"advanceWidthMax",
"minLeftSideBearing",
"minRightSideBearing",
"xMaxExtent",
"caretOffset",
),
),
(
ttLib.getTableClass("vhea"),
(
"ascent",
"descent",
"lineGap",
"advanceHeightMax",
"minTopSideBearing",
"minBottomSideBearing",
"yMaxExtent",
"caretOffset",
),
),
(
ttLib.getTableClass("OS/2"),
(
"xAvgCharWidth",
"ySubscriptXSize",
"ySubscriptYSize",
"ySubscriptXOffset",
"ySubscriptYOffset",
"ySuperscriptXSize",
"ySuperscriptYSize",
"ySuperscriptXOffset",
"ySuperscriptYOffset",
"yStrikeoutSize",
"yStrikeoutPosition",
"sTypoAscender",
"sTypoDescender",
"sTypoLineGap",
"usWinAscent",
"usWinDescent",
"sxHeight",
"sCapHeight",
),
),
(
otTables.ValueRecord,
("XAdvance", "YAdvance", "XPlacement", "YPlacement"),
), # GPOS
(otTables.Anchor, ("XCoordinate", "YCoordinate")), # GPOS
(otTables.CaretValue, ("Coordinate")), # GDEF
(otTables.BaseCoord, ("Coordinate")), # BASE
(otTables.MathValueRecord, ("Value")), # MATH
(otTables.ClipBox, ("xMin", "yMin", "xMax", "yMax")), # COLR
)
)
def visit(visitor, obj, attr, value):
setattr(obj, attr, visitor.scale(value))
@ScalerVisitor.register_attr(
(ttLib.getTableClass("hmtx"), ttLib.getTableClass("vmtx")), "metrics"
)
def visit(visitor, obj, attr, metrics):
for g in metrics:
advance, lsb = metrics[g]
metrics[g] = visitor.scale(advance), visitor.scale(lsb)
@ScalerVisitor.register_attr(ttLib.getTableClass("VMTX"), "VOriginRecords")
def visit(visitor, obj, attr, VOriginRecords):
for g in VOriginRecords:
VOriginRecords[g] = visitor.scale(VOriginRecords[g])
@ScalerVisitor.register_attr(ttLib.getTableClass("glyf"), "glyphs")
def visit(visitor, obj, attr, glyphs):
for g in glyphs.values():
for attr in ("xMin", "xMax", "yMin", "yMax"):
v = getattr(g, attr, None)
if v is not None:
setattr(g, attr, visitor.scale(v))
if g.isComposite():
for component in g.components:
component.x = visitor.scale(component.x)
component.y = visitor.scale(component.y)
continue
if hasattr(g, "coordinates"):
coordinates = g.coordinates
for i, (x, y) in enumerate(coordinates):
coordinates[i] = visitor.scale(x), visitor.scale(y)
@ScalerVisitor.register_attr(ttLib.getTableClass("gvar"), "variations")
def visit(visitor, obj, attr, variations):
glyfTable = visitor.font["glyf"]
for glyphName, varlist in variations.items():
glyph = glyfTable[glyphName]
for var in varlist:
coordinates = var.coordinates
for i, xy in enumerate(coordinates):
if xy is None:
continue
coordinates[i] = visitor.scale(xy[0]), visitor.scale(xy[1])
@ScalerVisitor.register_attr(ttLib.getTableClass("VARC"), "table")
def visit(visitor, obj, attr, varc):
# VarComposite variations are a pain
fvar = visitor.font["fvar"]
fvarAxes = [a.axisTag for a in fvar.axes]
store = varc.MultiVarStore
storeBuilder = OnlineMultiVarStoreBuilder(fvarAxes)
for g in varc.VarCompositeGlyphs.VarCompositeGlyph:
for component in g.components:
t = component.transform
t.translateX = visitor.scale(t.translateX)
t.translateY = visitor.scale(t.translateY)
t.tCenterX = visitor.scale(t.tCenterX)
t.tCenterY = visitor.scale(t.tCenterY)
if component.axisValuesVarIndex != otTables.NO_VARIATION_INDEX:
varIdx = component.axisValuesVarIndex
# TODO Move this code duplicated below to MultiVarStore.__getitem__,
# or a getDeltasAndSupports().
if varIdx != otTables.NO_VARIATION_INDEX:
major = varIdx >> 16
minor = varIdx & 0xFFFF
varData = store.MultiVarData[major]
vec = varData.Item[minor]
storeBuilder.setSupports(store.get_supports(major, fvar.axes))
if vec:
m = len(vec) // varData.VarRegionCount
vec = list(batched(vec, m))
vec = [Vector(v) for v in vec]
component.axisValuesVarIndex = storeBuilder.storeDeltas(vec)
else:
component.axisValuesVarIndex = otTables.NO_VARIATION_INDEX
if component.transformVarIndex != otTables.NO_VARIATION_INDEX:
varIdx = component.transformVarIndex
if varIdx != otTables.NO_VARIATION_INDEX:
major = varIdx >> 16
minor = varIdx & 0xFFFF
vec = varData.Item[varIdx & 0xFFFF]
major = varIdx >> 16
minor = varIdx & 0xFFFF
varData = store.MultiVarData[major]
vec = varData.Item[minor]
storeBuilder.setSupports(store.get_supports(major, fvar.axes))
if vec:
m = len(vec) // varData.VarRegionCount
flags = component.flags
vec = list(batched(vec, m))
newVec = []
for v in vec:
v = list(v)
i = 0
## Scale translate & tCenter
if flags & otTables.VarComponentFlags.HAVE_TRANSLATE_X:
v[i] = visitor.scale(v[i])
i += 1
if flags & otTables.VarComponentFlags.HAVE_TRANSLATE_Y:
v[i] = visitor.scale(v[i])
i += 1
if flags & otTables.VarComponentFlags.HAVE_ROTATION:
i += 1
if flags & otTables.VarComponentFlags.HAVE_SCALE_X:
i += 1
if flags & otTables.VarComponentFlags.HAVE_SCALE_Y:
i += 1
if flags & otTables.VarComponentFlags.HAVE_SKEW_X:
i += 1
if flags & otTables.VarComponentFlags.HAVE_SKEW_Y:
i += 1
if flags & otTables.VarComponentFlags.HAVE_TCENTER_X:
v[i] = visitor.scale(v[i])
i += 1
if flags & otTables.VarComponentFlags.HAVE_TCENTER_Y:
v[i] = visitor.scale(v[i])
i += 1
newVec.append(Vector(v))
vec = newVec
component.transformVarIndex = storeBuilder.storeDeltas(vec)
else:
component.transformVarIndex = otTables.NO_VARIATION_INDEX
varc.MultiVarStore = storeBuilder.finish()
@ScalerVisitor.register_attr(ttLib.getTableClass("kern"), "kernTables")
def visit(visitor, obj, attr, kernTables):
for table in kernTables:
kernTable = table.kernTable
for k in kernTable.keys():
kernTable[k] = visitor.scale(kernTable[k])
def _cff_scale(visitor, args):
for i, arg in enumerate(args):
if not isinstance(arg, list):
if not isinstance(arg, bytes):
args[i] = visitor.scale(arg)
else:
num_blends = arg[-1]
_cff_scale(visitor, arg)
arg[-1] = num_blends
@ScalerVisitor.register_attr(
(ttLib.getTableClass("CFF "), ttLib.getTableClass("CFF2")), "cff"
)
def visit(visitor, obj, attr, cff):
cff.desubroutinize()
topDict = cff.topDictIndex[0]
varStore = getattr(topDict, "VarStore", None)
getNumRegions = varStore.getNumRegions if varStore is not None else None
privates = set()
for fontname in cff.keys():
font = cff[fontname]
cs = font.CharStrings
for g in font.charset:
c, _ = cs.getItemAndSelector(g)
privates.add(c.private)
commands = cffSpecializer.programToCommands(
c.program, getNumRegions=getNumRegions
)
for op, args in commands:
if op == "vsindex":
continue
_cff_scale(visitor, args)
c.program[:] = cffSpecializer.commandsToProgram(commands)
# Annoying business of scaling numbers that do not matter whatsoever
for attr in (
"UnderlinePosition",
"UnderlineThickness",
"FontBBox",
"StrokeWidth",
):
value = getattr(topDict, attr, None)
if value is None:
continue
if isinstance(value, list):
_cff_scale(visitor, value)
else:
setattr(topDict, attr, visitor.scale(value))
for i in range(6):
topDict.FontMatrix[i] /= visitor.scaleFactor
for private in privates:
for attr in (
"BlueValues",
"OtherBlues",
"FamilyBlues",
"FamilyOtherBlues",
# "BlueScale",
# "BlueShift",
# "BlueFuzz",
"StdHW",
"StdVW",
"StemSnapH",
"StemSnapV",
"defaultWidthX",
"nominalWidthX",
):
value = getattr(private, attr, None)
if value is None:
continue
if isinstance(value, list):
_cff_scale(visitor, value)
else:
setattr(private, attr, visitor.scale(value))
# ItemVariationStore
@ScalerVisitor.register(otTables.VarData)
def visit(visitor, varData):
for item in varData.Item:
for i, v in enumerate(item):
item[i] = visitor.scale(v)
varData.calculateNumShorts()
# COLRv1
def _setup_scale_paint(paint, scale):
if -2 <= scale <= 2 - (1 >> 14):
paint.Format = otTables.PaintFormat.PaintScaleUniform
paint.scale = scale
return
transform = otTables.Affine2x3()
transform.populateDefaults()
transform.xy = transform.yx = transform.dx = transform.dy = 0
transform.xx = transform.yy = scale
paint.Format = otTables.PaintFormat.PaintTransform
paint.Transform = transform
@ScalerVisitor.register(otTables.BaseGlyphPaintRecord)
def visit(visitor, record):
oldPaint = record.Paint
scale = otTables.Paint()
_setup_scale_paint(scale, visitor.scaleFactor)
scale.Paint = oldPaint
record.Paint = scale
return True
@ScalerVisitor.register(otTables.Paint)
def visit(visitor, paint):
if paint.Format != otTables.PaintFormat.PaintGlyph:
return True
newPaint = otTables.Paint()
newPaint.Format = paint.Format
newPaint.Paint = paint.Paint
newPaint.Glyph = paint.Glyph
del paint.Paint
del paint.Glyph
_setup_scale_paint(paint, 1 / visitor.scaleFactor)
paint.Paint = newPaint
visitor.visit(newPaint.Paint)
return False
def scale_upem(font, new_upem):
"""Change the units-per-EM of font to the new value."""
upem = font["head"].unitsPerEm
visitor = ScalerVisitor(new_upem / upem)
visitor.visit(font)
def main(args=None):
"""Change the units-per-EM of fonts"""
if args is None:
import sys
args = sys.argv[1:]
from fontTools.ttLib import TTFont
from fontTools.misc.cliTools import makeOutputFileName
import argparse
parser = argparse.ArgumentParser(
"fonttools ttLib.scaleUpem", description="Change the units-per-EM of fonts"
)
parser.add_argument("font", metavar="font", help="Font file.")
parser.add_argument(
"new_upem", metavar="new-upem", help="New units-per-EM integer value."
)
parser.add_argument(
"--output-file", metavar="path", default=None, help="Output file."
)
options = parser.parse_args(args)
font = TTFont(options.font)
new_upem = int(options.new_upem)
output_file = (
options.output_file
if options.output_file is not None
else makeOutputFileName(options.font, overWrite=True, suffix="-scaled")
)
scale_upem(font, new_upem)
print("Writing %s" % output_file)
font.save(output_file)
if __name__ == "__main__":
import sys
sys.exit(main())
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