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Limit the number of writes to improve performance #22

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Merged
merged 3 commits into from
Nov 10, 2022
Merged

Limit the number of writes to improve performance #22

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1224b6a
Limit the number of writes to improve performance
grouma Nov 1, 2022
1260ac0
rename
grouma Nov 3, 2022
f2e0249
black format
grouma Nov 3, 2022
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17 changes: 10 additions & 7 deletions adafruit_sharpmemorydisplay.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,9 +28,9 @@
"""
# pylint: enable=line-too-long

from micropython import const
import adafruit_framebuf
from adafruit_bus_device.spi_device import SPIDevice
from micropython import const

try:
import numpy
Expand Down Expand Up @@ -85,23 +85,26 @@ def show(self):

with self.spi_device as spi:

_imageBuf = bytearray()
# toggle the VCOM bit
self._buf[0] = _SHARPMEM_BIT_WRITECMD
if self._vcom:
self._buf[0] |= _SHARPMEM_BIT_VCOM
self._vcom = not self._vcom
spi.write(self._buf)
_imageBuf.extend(self._buf)

slice_from = 0
line_len = self.width // 8
for line in range(self.height):
self._buf[0] = reverse_bit(line + 1)
spi.write(self._buf)
spi.write(memoryview(self.buffer[slice_from : slice_from + line_len]))
_imageBuf.extend(self._buf)
_imageBuf.extend(
self.buffer[slice_from: slice_from + line_len])
slice_from += line_len
self._buf[0] = 0
spi.write(self._buf)
spi.write(self._buf) # we send one last 0 byte
_imageBuf.extend(self._buf)
_imageBuf.extend(self._buf)
spi.write(_imageBuf)

def image(self, img):
"""Set buffer to value of Python Imaging Library image. The image should
Expand Down Expand Up @@ -135,7 +138,7 @@ def image(self, img):
self.buf[i] = 0
# Iterate through the pixels
for x in range(width): # yes this double loop is slow,
for y in range(height): # but these displays are small!
for y in range(height): # but these displays are small!
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Was this a manual? My guess this whitespace change is what's making black angry.

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Automatically formatted by VS Code. I'm not sure what black is in reference to. I can revert this change if you wish but it's probably good cleanup.

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Yeah, it's just that the CI will continue to complain. If you want to be extra sure, you can run pre-commit yourself, and let it decide what how to format everything. Pre-commit is what the CI uses, so that's the surest way.

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black is a formatter, and our CI tool pre-commit uses it to standardize the formatting of our code.

if img.mode == "RGB":
self.pixel(x, y, pixels[(x, y)])
elif pixels[(x, y)]:
Expand Down