from displayio import Bitmap

import bitmapfilter

from dump_bitmap import dump_bitmap

def make_circle_bitmap():

b = Bitmap(17, 17, 65535)

for i in range(b.height):

y = i - 8

for j in range(b.width):

x = j - 8

c = (x * x + y * y) > 64

b[i, j] = 0xFFFF if c else 0

return b

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

blur = (1, 2, 1, 2, 4, 2, 1, 2, 1)

sharpen = [-1, -2, -1, -2, 4, -2, -1, -2, -1]

b = make_circle_bitmap()

dump_bitmap(b)

bitmapfilter.morph(b, weights=blur)

dump_bitmap(b)

b = make_circle_bitmap()

q = make_quadrant_bitmap()

dump_bitmap(q)

bitmapfilter.morph(b, mask=q, weights=blur, add=1 / 4)

dump_bitmap(b)

# This is a kind of edge filter

b = make_circle_bitmap()

bitmapfilter.morph(b, weights=sharpen, threshold=True, add=0.125, invert=True)

dump_bitmap(b)