8000 subset: speed up subsetting of large fonts by aschmitz · Pull Request #2467 · fonttools/fonttools · GitHub
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subset: speed up subsetting of large fonts #2467

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Dec 15, 2021
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subset: speed up subsetting of large fonts #2467

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12 changes: 7 additions & 5 deletions Lib/fontTools/subset/cff.py
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Original file line number Diff line number Diff line change
Expand Up @@ -53,8 +53,7 @@ def _empty_charstring(font, glyphName, isCFF2, ignoreWidth=False):
c, fdSelectIndex = font.CharStrings.getItemAndSelector(glyphName)
if isCFF2 or ignoreWidth:
# CFF2 charstrings have no widths nor 'endchar' operators
c.decompile()
c.program = [] if isCFF2 else ['endchar']
c.setProgram([] if isCFF2 else ['endchar'])
else:
if hasattr(font, 'FDArray') and font.FDArray is not None:
private = font.FDArray[fdSelectIndex].Private
Expand Down Expand Up @@ -120,9 +119,12 @@ def subset_glyphs(self, s):
#sel.format = None
sel.format = 3
sel.gidArray = [sel.gidArray[i] for i in indices]
cs.charStrings = {g:indices.index(v)
for g,v in cs.charStrings.items()
if g in glyphs}
newCharStrings = {}
for indicesIdx, charsetIdx in enumerate(indices):
g = font.charset[charsetIdx]
if g in cs.charStrings:
newCharStrings[g] = indicesIdx
cs.charStrings = newCharStrings
else:
cs.charStrings = {g:v
for g,v in cs.charStrings.items()
Expand Down
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