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bitmapfilter_mix.py

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from displayio import Bitmap

import bitmapfilter

import ulab

from dump_bitmap import dump_bitmap_rgb_swapped

from blinka_image import decode_resource

def test_pattern():

return decode_resource("testpattern", 2)

def make_quadrant_bitmap():

b = Bitmap(17, 17, 1)

for i in range(b.height):

for j in range(b.width):

b[i, j] = (i < 8) ^ (j < 8)

return b

q = make_quadrant_bitmap()

b = test_pattern()

dump_bitmap_rgb_swapped(b)

sepia_weights = bitmapfilter.ChannelMixer(

0.393, 0.769, 0.189, 0.349, 0.686, 0.168, 0.272, 0.534, 0.131

)

print("sepia")

bitmapfilter.mix(b, sepia_weights)

dump_bitmap_rgb_swapped(b)

# Red channel only

print("red channel only (note: masked)")

b = test_pattern()

bitmapfilter.mix(b, bitmapfilter.ChannelScale(1, 0, 0), mask=q)

dump_bitmap_rgb_swapped(b)

# Scale green channel

print("scale green channel (note: masked)")

b = test_pattern()

bitmapfilter.mix(b, bitmapfilter.ChannelScale(1, 2, 0), mask=q)

dump_bitmap_rgb_swapped(b)

# Swap R & G channels

print("swap R&G")

b = test_pattern()

bitmapfilter.mix(b, bitmapfilter.ChannelMixerOffset(0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0))

dump_bitmap_rgb_swapped(b)

# invert B

print("invert B")

b = test_pattern()

bitmapfilter.mix(b, bitmapfilter.ChannelScaleOffset(1, 0, 1, 0, -1, 1))

dump_bitmap_rgb_swapped(b)