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use 0 for sidebearing sparse metrics sentinel

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font sources only allow to specify advances, the sidebearings are computed. Makes more sense for the sparse metrics to have 0 for the sidebearings as the glyph that's meant to be 'sparse' is most likely empty with no outlines
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Cosimo Lupo 2023-08-02 15:12:26 +01:00
parent ecfc5eeeb7
commit 48ae9cbf1c
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GPG Key ID: DF65A8A5A119C9A8
2 changed files with 4 additions and 4 deletions
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6
Lib/fontTools/varLib/__init__.py
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@ -563,11 +563,11 @@ def _get_advance_metrics(
):
vhAdvanceDeltasAndSupports = {}
vOrigDeltasAndSupports = {}
# HACK: we treat width 65535 and lsb -32768 as sentinel values to signal that a
# glyph from a non-default master should not participate in computing {H,V}VAR,
# HACK: we treat width 65535 and lsb 0 as sentinel values to signal that a glyph
# from a non-default master should not participate in computing {H,V}VAR,
# as if it were missing. Allows to variate other glyph-related data independently
# from glyph metrics
sparse_metrics = (0xFFFF, -0x8000)
sparse_metrics = (0xFFFF, 0)
for glyph in glyphOrder:
vhAdvances = [
metrics[glyph][0]

2
Tests/varLib/data/master_sparse_cff2_empty/SparseCFF-Medium.ttx
View File

@ -93,7 +93,7 @@
</CFF>
<hmtx>
<mtx name=".notdef" width="65535" lsb="-32768"/>
<mtx name=".notdef" width="65535" lsb="0"/>
<mtx name="e" width="600" lsb="40"/>
</hmtx>