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Speed up the pixels to page bytes conversion #2

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Speed up the pixels to page bytes conversion #2

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21 changes: 10 additions & 11 deletions lib_oled96.py
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Original file line number Diff line number Diff line change
Expand Up @@ -85,18 +85,17 @@ def display(self):
const.PAGEADDR, 0x00, self.pages-1) # Page start/end address

pix = list(self.image.getdata())
step = self.width * 8
buf = []
for y in range(0, self.pages * step, step):
i = y + self.width-1
while i >= y:
byte = 0
for n in range(0, step, self.width):
byte |= (pix[i + n] & 0x01) << 8
byte >>= 1

buf.append(byte)
i -= 1

def make_byte(*lines):
# Even though self.image is B/W, the pixel value is sometimes set to 255 instead of 1
return ((lines[7] & 1) << 7 | (lines[6] & 1) << 6 | (lines[5] & 1) << 5
| (lines[4] & 1) << 4 | (lines[3] & 1) << 3 | (lines[2] & 1) << 2
| (lines[1] & 1) << 1 | (lines[0] & 1))

lines = [pix[i:i + self.width] for i in xrange(0, self.width * self.height, self.width)]
for l in range(0, self.height, 8):
buf.extend(reversed(map(make_byte, *lines[l:l + 8])))

self._data(buf) # push out the whole lot

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