Extract splash screen from Atmosphere's package3

extract_splash_screen.py

 
from PIL import Image
import sys, os
from struct import pack as pk
from math import floor

SPLASH_SCREEN_WIDTH  = 1280
SPLASH_SCREEN_HEIGHT = 720

SPLASH_SCREEN_STRIDE = 768

def convert_bytes(data):
	mutable = bytearray()
	pixel_length = 4 + ((SPLASH_SCREEN_STRIDE - SPLASH_SCREEN_HEIGHT) * 4)
	row_length = 4 * SPLASH_SCREEN_HEIGHT + ((SPLASH_SCREEN_STRIDE - SPLASH_SCREEN_HEIGHT) * 4)
	for ii in range(SPLASH_SCREEN_WIDTH):
		for jj in range(SPLASH_SCREEN_HEIGHT):
			mutable += pk('<BBBB', data[ii*row_length+jj*4+2], data[ii*row_length+jj*4+1], data[ii*row_length+jj*4], data[ii*row_length+jj*4+3])
	splash = Image.frombytes('RGBA', (SPLASH_SCREEN_HEIGHT, SPLASH_SCREEN_WIDTH), mutable)
	# splash = splash.transpose(Image.ROTATE_270)
	splash.save('splash.bmp')


def main(argc, argv):
		if argc != 2:
				print('Usage: %s package3' % argv[0])
				return 1
		with open(argv[1], 'rb') as f:
				package3 = f.read()
		assert package3[:4] == b'PK31'
		assert len(package3) == 0x800000
		convert_bytes(package3[0x400000:0x7C0000])
		return 0

if __name__ == '__main__':
		sys.exit(main(len(sys.argv), sys.argv))

How can we convert our custom bmp logos into .bin file so that we can Include it in the source and build it inline?

I have no idea. This script is just the reversed version of insert_splash_screen.py from Atmosphere