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wasp: draw565: Optimize the bit expansion blitter slightly.

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This commit is contained in:
Daniel Thompson 2020-04-10 20:23:12 +01:00
parent 22ca8886c2
commit f734568ad2
1 changed files with 5 additions and 8 deletions
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13
wasp/draw565.py
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@ -7,13 +7,12 @@ import micropython
@micropython.viper
def _bitblit(bitbuf, pixels, bgfg: int, count: int):
mv = ptr8(bitbuf)
mv = ptr16(bitbuf)
px = ptr8(pixels)
bghi = (bgfg >> 24) & 0xff
bglo = (bgfg >> 16) & 0xff
fghi = (bgfg >> 8) & 0xff
fglo = (bgfg ) & 0xff
# Extract and byte-swap
bg = ((bgfg >> 24) & 0xff) + ((bgfg >> 8) & 0xff00)
fg = ((bgfg >> 8) & 0xff) + ((bgfg & 0xff) << 8)
bitselect = 0x80
pxp = 0
@ -22,9 +21,7 @@ def _bitblit(bitbuf, pixels, bgfg: int, count: int):
for bit in range(count):
# Draw the pixel
active = px[pxp] & bitselect
mv[mvp] = fghi if active else bghi
mvp += 1
mv[mvp] = fglo if active else bglo
mv[mvp] = fg if active else bg
mvp += 1
# Advance to the next bit