PNG888to565.py

#Licensed under the 3-Clause BSD License
#Copyright 2021, Martin Wendt
#Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
#
#1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
#
#2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
#
#3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
#
#THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
#TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
#CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
#LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
#SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#======================================================
#This script converts an 24bit color PNG to a binary
#file in RGB=565 format.

import sys
import pygame
from pygame.locals import *

gfx = pygame.image.load(sys.argv[1])
binfile=open(sys.argv[2],'wb')
data=[]
w,h = gfx.get_size()

for y in range(h):
        for x in range(w):
            col=gfx.get_at((x, y))
            r,g,b,a=col
            nr = (r >>3)
            ng = (g >>2)
            nb = (b >>3)
            value565= nb + (ng<<5) + (nr<<11)
            data.append(value565 >> 8)
            data.append(value565 & 0xff)
            
databytes=bytearray(data)
binfile.write(databytes)