Bitmaps #
A bitmap is just an empty image. It has a fixed size and number of colors. Pixels can be set directly using x,y coordinates.
import displayio
bitmap = displayio.Bitmap(32,32,2)
palette = displayio.Palette(2)
palette[0] = 0x000000
palette[1] = 0xffffff
# set pixel at x=3, y=4 to color 1
bitmap[3,4] = 1
Bitmaps can only be shown on screen using a tilegrid. To create a tilegrid that shows the bitmap without any repetition, do:
tilegrid = displayio.TileGrid(bitmap, pixel_shader=palette)
display.root_group.append(tilegrid)
convert a PNG to a indexed color bitmap
convert digits.png -colors 64 -type palette -compress None BMP3:digits.bmp