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Content # Credits: # https://github.com/adafruit/Adafruit_CircuitPython_EPD/blob/master/examples/epd_bitmap.py # https://badge.team/files/21364 import os import display FILENAME = "picture.bmp" def display_error(message): with display.open() as d: d.clear().print(message).update() class BMPError(Exception): def __init__(self, message): super().__init__(message) display_error(message) class BMP: def __init__(self, filename, disp, flip=True): try: with open(filename, "rb") as f: # Read and check magic numbers if f.read(2) != b"BM": raise BMPError("Invalid bitmap file") file_size = self.read_le(f.read(4)) f.read(4) # Read & ignore creator bytes self.image_offset = self.read_le(f.read(4)) # Start of image data header_size = self.read_le(f.read(4)) self.width = self.read_le(f.read(4)) self.height = self.read_le(f.read(4)) self.flip = flip print( "Size: {}\nImage offset: {}\nHeader size: {}".format( file_size, self.image_offset, header_size ) ) print("Width: {}\nHeight: {}".format(self.width, self.height)) if self.read_le(f.read(2)) != 1: raise BMPError("Not singleplane") depth = self.read_le(f.read(2)) # bits per pixel print("Bit depth: {}".format(depth)) if depth != 24: raise BMPError("BMP is not 24-bit") if self.read_le(f.read(2)) != 0: raise BMPError("Compressed file (unsupported)") print("Image OK") self.row_size = (self.width * 3 + 3) & ~3 # 32-bit line boundary except OSError: display_error("Couldn't open file '{}'".format(filename)) return print("Loading...") disp.print("Loading...", font=display.FONT12) disp.update() with open(filename, "rb") as f: for y in range(self.height): if self.flip: # Bitmap is stored bottom-to-top order (normal BMP) pos = self.image_offset + (self.height - 1 - y) * self.row_size else: pos = self.image_offset + y * self.row_size f.seek(pos) for x in range(self.width): pixel = [f.read(1), f.read(1), f.read(1)] pixel = [int.from_bytes(n, "little") for n in pixel] disp.pixel(x, y, col=pixel[::-1]) # Colors are in BGR format print("Done.") def read_le(self, b): return int.from_bytes(b, "little") if __name__ == "__main__": d = display.open() d.clear() BMP(FILENAME, d) d.update() d.close()