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[scaleUpem/VarComposites] Implement gvar scaling

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This commit is contained in:
Behdad Esfahbod 2023-01-17 17:13:42 -07:00
parent 6846a217ab
commit 2900eabe10
1 changed files with 36 additions and 1 deletions
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37
Lib/fontTools/ttLib/scaleUpem.py
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@ -12,6 +12,7 @@ from fontTools.cffLib import VarStoreData
import fontTools.cffLib.specializer as cffSpecializer
from fontTools.varLib import builder # for VarData.calculateNumShorts
from fontTools.misc.fixedTools import otRound
from fontTools.ttLib.tables._g_l_y_f import VarComponentFlags
__all__ = ["scale_upem", "ScalerVisitor"]
@ -153,7 +154,41 @@ def visit(visitor, obj, attr, variations):
coordinates[i] = visitor.scale(xy[0]), visitor.scale(xy[1])
continue
raise NotImplementedError
# VarComposite glyph
i = 0
for component in glyph.components:
if component.flags & VarComponentFlags.AXES_HAVE_VARIATION:
i += len(component.location)
if component.flags & (
VarComponentFlags.HAVE_TRANSLATE_X
| VarComponentFlags.HAVE_TRANSLATE_Y
):
xy = coordinates[i]
coordinates[i] = visitor.scale(xy[0]), visitor.scale(xy[1])
i += 1
if component.flags & VarComponentFlags.HAVE_ROTATION:
i += 1
if component.flags & (
VarComponentFlags.HAVE_SCALE_X | VarComponentFlags.HAVE_SCALE_Y
):
i += 1
if component.flags & (
VarComponentFlags.HAVE_SKEW_X | VarComponentFlags.HAVE_SKEW_Y
):
i += 1
if component.flags & (
VarComponentFlags.HAVE_TCENTER_X | VarComponentFlags.HAVE_TCENTER_Y
):
xy = coordinates[i]
coordinates[i] = visitor.scale(xy[0]), visitor.scale(xy[1])
i += 1
# Phantom points
assert i + 4 == len(coordinates)
for i in range(i, len(coordinates)):
xy = coordinates[i]
coordinates[i] = visitor.scale(xy[0]), visitor.scale(xy[1])
@ScalerVisitor.register_attr(ttLib.getTableClass("kern"), "kernTables")