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Added image function that uses numpy if available #19

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Merged
merged 2 commits into from
Apr 25, 2022
Merged

Added image function that uses numpy if available #19

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3f6aab6
Added check for numpy, and overloaded the image function to uses nump…
ilikecake Feb 21, 2022
f96d82b
Update formatting to make black happy
ilikecake Feb 21, 2022
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43 changes: 43 additions & 0 deletions adafruit_sharpmemorydisplay.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,11 @@
from micropython import const
import adafruit_framebuf

try:
import numpy
except ImportError:
numpy = None

__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_SharpMemoryDisplay.git"

Expand Down Expand Up @@ -103,3 +108,41 @@ def show(self):
self._spi.write(self._buf) # we send one last 0 byte
self._scs_pin.value = False
self._spi.unlock()

def image(self, img):
"""Set buffer to value of Python Imaging Library image. The image should
be in 1 bit mode and a size equal to the display size."""
# determine our effective width/height, taking rotation into account
width = self.width
height = self.height
if self.rotation in (1, 3):
width, height = height, width

if img.mode != "1":
raise ValueError("Image must be in mode 1.")

imwidth, imheight = img.size
if imwidth != width or imheight != height:
raise ValueError(
"Image must be same dimensions as display ({0}x{1}).".format(
width, height
)
)

if numpy:
self.buffer = bytearray(
numpy.packbits(numpy.asarray(img), axis=1).flatten().tolist()
)
else:
# Grab all the pixels from the image, faster than getpixel.
pixels = img.load()
# Clear buffer
for i in range(len(self.buf)): # pylint: disable=consider-using-enumerate
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!
if img.mode == "RGB":
self.pixel(x, y, pixels[(x, y)])
elif pixels[(x, y)]:
self.pixel(x, y, 1) # only write if pixel is true