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fonts: sans24: Minor refactor to reduce memory allocation

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This is a useful but modest optimization (maybe 3% in string
rendering.
This commit is contained in:
Daniel Thompson 2020-03-09 21:33:29 +00:00
parent 820764081e
commit 3ded49c5ef
1 changed files with 5 additions and 4 deletions
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9
wasp/fonts/sans24.py
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@ -355,14 +355,15 @@ b'\x50\x13'
_mvfont = memoryview(_font)
_mvi = memoryview(_index)
ifb = lambda l : l[0] | (l[1] << 8)
def get_ch(ch):
mvi = _mvi
mvfont = _mvfont
oc = ord(ch)
ioff = 2 * (oc - 32 + 1) if oc >= 32 and oc <= 126 else 0
doff = ifb(_mvi[ioff : ])
width = ifb(_mvfont[doff : ])
doff = mvi[ioff] | (mvi[ioff+1] << 8)
width = mvfont[doff] | (mvfont[doff+1] << 8)
next_offs = doff + 2 + ((width - 1)//8 + 1) * 24
return _mvfont[doff + 2:next_offs], 24, width