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instancer: add docstring for 'instantiateTupleVariationStore'

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Cosimo Lupo 2019-06-14 12:51:31 +01:00
parent 754c3c2381
commit 29daa994f0
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Lib/fontTools/varLib/instancer.py
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@ -93,6 +93,30 @@ log = logging.getLogger("fontTools.varLib.instancer")
def instantiateTupleVariationStore(variations, location, origCoords=None, endPts=None):
"""Instantiate TupleVariation list at the given location.
The 'variations' list of TupleVariation objects is modified in-place.
The input location can describe either a full instance (all the axes are assigned an
explicit coordinate) or partial (some of the axes are omitted).
Tuples that do not participate are kept as they are. Those that have 0 influence
at the given location are removed from the variation store.
Those that are fully instantiated (i.e. all their axes are being pinned) are also
removed from the variation store, their scaled deltas accummulated and returned, so
that they can be added by the caller to the default instance's coordinates.
Tuples that are only partially instantiated (i.e. not all the axes that they
participate in are being pinned) are kept in the store, and their deltas multiplied
by the scalar support of the axes to be pinned at the desired location.
Args:
variations: List[TupleVariation] from either 'gvar' or 'cvar'.
location: Dict[str, float]: axes coordinates for the full or partial instance.
origCoords: GlyphCoordinates: default instance's coordinates for computing 'gvar'
inferred points (cf. table__g_l_y_f.getCoordinatesAndControls).
endPts: List[int]: indices of contour end points, for inferring 'gvar' deltas.
Returns:
List[float]: the overall delta adjustment after applicable deltas were summed.
"""
newVariations = collections.OrderedDict()
for var in variations:
# Compute the scalar support of the axes to be pinned at the desired location,