jpegio_slideshow.py

# jpeg loader slideshow
# based on color summarizer by @todbot / Tod Kurt
#https://gist.github.com/todbot/0bf32a6bf8dd21983a32bafc173b3223#file-code_color_palette_finder-py

import time
import board
import displayio
import jpegio
from adafruit_hx8357 import HX8357
import gc

displayio.release_displays()

jpeg_fnames = (
    "/imgs/radroom2.jpg",
    "/imgs/queen.jpg",
    "/imgs/bike.jpg",
    "/imgs/Jules_and_Vincent.jpg"
)

spi = board.SPI()
tft_cs = board.D9
tft_dc = board.D10
display_bus = displayio.FourWire(spi, command=tft_dc, chip_select=tft_cs)
display = HX8357(display_bus, width=320, height=480, rotation=270)

main_group = displayio.Group()
display.root_group = main_group

# start out with a blank screen, we'll replace later
bitmap = displayio.Bitmap(480, 320, 65535)
pixel_shader = displayio.ColorConverter(input_colorspace=displayio.Colorspace.RGB565_SWAPPED)
tile_grid = displayio.TileGrid(bitmap, pixel_shader=pixel_shader)
main_group.append(tile_grid)

def load_jpeg_to_bitmap(jpeg_fname):
    """Load a JPEG into a displayio.Bitmap"""
    decoder = jpegio.JpegDecoder()
    width, height = decoder.open(jpeg_fname)
    bitmap = displayio.Bitmap(width, height, 65535)  # RGB565_SWAPPED is 16-bit
    decoder.decode(bitmap)
    return bitmap

def slide_show(time_delay=1):
    for jpeg_fname in jpeg_fnames:
        print("----\njpeg file:", jpeg_fname)
        bitmap = load_jpeg_to_bitmap(jpeg_fname)
        tile_grid = displayio.TileGrid(bitmap, pixel_shader=pixel_shader)
        main_group[0] = tile_grid

        gc.collect()
        time.sleep(time_delay)

while True:
    slide_show(time_delay=2)