def _interpolate(self,
factor,
minKerning,
maxKerning,
round=True,
suppressError=True):
"""
This is the environment implementation of :meth:`BaseKerning.interpolate`.
* **factor** will be an :ref:`type-int-float`, ``tuple`` or ``list``.
* **minKerning** will be a :class:`BaseKerning` object.
* **maxKerning** will be a :class:`BaseKerning` object.
* **round** will be a ``bool`` indicating if the interpolated kerning
should be rounded.
* **suppressError** will be a ``bool`` indicating if incompatible data
should be ignored.
Subclasses may override this method.
"""
import fontMath
minKerning = fontMath.MathKerning(kerning=minKerning,
groups=minKerning.font.groups)
maxKerning = fontMath.MathKerning(kerning=maxKerning,
groups=maxKerning.font.groups)
result = interpolate(minKerning, maxKerning, factor)
if round:
result.round()
self.clear()
result.extractKerning(self.font)
def collect_kerning_masters(
designspace: designspaceLib.DesignSpaceDocument,
axis_bounds: AxisBounds) -> List[Tuple[Location, FontMathObject]]:
"""Return master kerning objects wrapped by MathKerning."""
# Always take the groups from the default source. This also avoids fontMath
# making a union of all groups it is given.
groups = designspace.default.font.groups
locations_and_masters = []
for source in designspace.sources:
if source.layerName is not None:
continue # No kerning in source layers.
# If a source has groups, they should match the default's.
if source.font.groups and source.font.groups != groups:
logger.warning(
"The source %s (%s) contains different groups than the default source. "
"The default source's groups will be used for the instances.",
source.name,
source.filename,
)
# This assumes that groups of all sources are the same.
normalized_location = varLib.models.normalizeLocation(
source.location, axis_bounds)
locations_and_masters.append(
(normalized_location,
fontMath.MathKerning(source.font.kerning, groups)))
return locations_and_masters
def _interpolate(self,
factor,
minKerning,
maxKerning,
round=True,
suppressError=True):
"""
This is the environment implementation of :meth:`BaseKerning.interpolate`.
* **factor** will be an :ref:`type-int-float`, ``tuple`` or ``list``.
* **minKerning** will be a :class:`BaseKerning` object.
* **maxKerning** will be a :class:`BaseKerning` object.
* **round** will be a ``bool`` indicating if the interpolated kerning
should be rounded.
* **suppressError** will be a ``bool`` indicating if incompatible data
should be ignored.
Subclasses may override this method.
"""
import fontMath
from fontMath.mathFunctions import setRoundIntegerFunction
setRoundIntegerFunction(normalizers.normalizeVisualRounding)
kerningGroupCompatibility = self._testKerningGroupCompatibility(
minKerning, maxKerning, suppressError=suppressError)
if not kerningGroupCompatibility:
self.clear()
else:
minKerning = fontMath.MathKerning(kerning=minKerning,
groups=minKerning.font.groups)
maxKerning = fontMath.MathKerning(kerning=maxKerning,
groups=maxKerning.font.groups)
result = interpolate(minKerning, maxKerning, factor)
if round:
result.round()
self.clear()
result.extractKerning(self.font)
def collect_kerning_masters(
designspace: designspaceLib.DesignSpaceDocument,
axis_bounds: AxisBounds) -> List[Tuple[Location, FontMathObject]]:
"""Return master kerning objects wrapped by MathKerning."""
locations_and_masters = []
for source in designspace.sources:
if source.layerName is not None:
continue # No kerning in source layers.
# This assumes that groups of all sources are the same.
normalized_location = varLib.models.normalizeLocation(
source.location, axis_bounds)
locations_and_masters.append((
normalized_location,
fontMath.MathKerning(source.font.kerning, source.font.groups),
))
return locations_and_masters