If we modify the default instance coordinates, then the inferred deltas that
are left in gvar are no longer valid, so we need to calculate them using the
original default coordinates.
They are then re-optimized using the modified default coordinates.
Also, the default deltas returned from instantiateTupleVariationStore are now
already rounded to integer.
The instantiateTupleVariationStore function now groups TupleVariation
tables that have the same axes 'tents', then merges them into a single
TupleVariation by summing their deltas. The rounding to integer happens
after summing the scaled deltas as floats, to reduce off-by-one errors.
To be able to sum gvar TupleVariation, it needs to calculate the inferred
deltas so it now takes two optional lists (origCoords and endPts) that
are passed on to iup_delta function. These only make sense for gvar
type of TupleVariation, of course, and are unused for cvar tuples.
It also run iup_delta_optimize on the gvar deltas that are left after
partial instancing and whose inferred deltas had to be interpolated.
This can be disabled with --no-optimize CLI option.
Also added calcInferredDeltas and optimize methods to TupleVariation
class, which use functions from varLib.iup module, plus tests
that exercise them.
update VarData.VarRegionCount
also set StartCoord and EndCoord to 0 (same end result as only setting PeakCoord
to 0, but this produces less noise when inspeciting the generated XML dump)
I added an MVAR table to the PartialInstancer-VF.ttx test font with made-up deltas for
OS/2.yStrikeoutSize, post.underlinePosition and post.underlineThickness.
I defined 3 regions, one with only wght, one with only wdth, and one with both wdth and wght axes.
not only base should be at 0, but min/max respectively at -1.0 and +1.0.
that's how varLib constructs models internally, so update test case to reflect that
* Revert "load_masters: actually assign font attributes"
This reverts commit ef1d4cd02d1e46f5dac3914f547a6e4275cf3077, which caused a
crash in `interpolate_layout()` when `deepcopy`ing OTFs.
Amend code and tests while I work on a real fix.
in a designspace document, the sources' filename attribute can now contain
a relative path to a .TTX file for that master, in addition to .TTF or .UFO
(the latter, resolved through a master_finder callable as before).
Added interpolation of glyph advance width, from HVAR/hmtx, and derivation of new LSB.
Updated tests to match.
Needed to cherrypick from another branch an update for psCharstrings to allow the CFFSubr.draw() method to work.
varStore.py. Commit the correct function references.
psCharstrings.py. Add decompiler class specifically for flattening subroutinized charstrings.
mutator.py. Flatten the subroutinized charstrings, delete the Subrs.
TestCFF2VF.otf, Updated to version with subroutinization. Updated expected ttx output.
varLib.py. restore import of 'fontTools.misc.py23 import *'
varStore.py. Rename 'applyScalar' to 'interpolateFromDeltasAndScalars', and refactor common code with __git__item to a static method.
mutator.py. Update to reflect function name change to interpolateFromDeltasAndScalars. Changed some logic from one line to several lines for readability, and i to avoid flake8 warnings about line too long.
