bmp2array.py - A python script for genarting image arrays from 1-bit bitmaps for DPEG0290RW series Epaper display. This display has unique scannning method. The bits should be written vertically, but the data should be present horizontally in the image array.

bmp2array.py

'''
Test image 1: https://imgur.com/ZL9xyBy
Test image 2: https://imgur.com/MtHCRrb
Test image 3: https://imgur.com/J4ULXO0
Test image 4: https://imgur.com/jHyfTJa

@author: Tamojit Saha <https://github.com/TamojitSaha>
'''

from PIL import Image
import numpy as np
import sys 
np.set_printoptions(threshold=sys.maxsize)

def add_padding(hexString: str, hexLen: int)->str:
    if hexLen > len(hexString):
        padded_str = '0x'+'0'* (hexLen - len(hexString))+hexString[2:]
        return padded_str
    else: print("Invalid entry")


def bmp2array(filename: str)->None:
    im = Image.open(filename)
    ar = (~np.array(im).astype(bool)).astype(int)
    h,w = ar.shape
    ar1 = ar.copy()
    # print(ar)
    # print("\n")
    # print(ar.shape)

    final = [0]*(int(h/8)*w)
    d = []
    for k in range(0,w):
        for i in range(0,h):
            d.append(ar1[:][i][k])
        # print(d)    
        a = np.asarray_chkfinite(d)
        c = np.array_split(a,h/8)
        factor = len(c)
        # print(c)
        if len(c)>1:
            for j in range(factor):
                hexData = hex(int("".join(str(m) for m in c[j]),2))#base:2
                if(len(hexData)==3) : 
                    data = add_padding(hexData,4)
                    final[k+(w*j)] = data
                else: final[k+(w*j)] = hexData

        else:
            c0 = hex(int("".join(str(i) for i in c[0]),2))
            final[k]=c0
        d.clear()

    # print(final, len(final))

    hexString = "const unsigned char gImage_"+filename.split('.')[0]+"["+str(int(h/8)*w)+"] = {\r"
    for i in range (0, len(final)):
        hexString += str(final[i])+", "        
        if i%16 == 0:
            hexString +='\r'

    hexString = hexString[:-2]
    hexString +='\r};'

    # print(hexString)

    m_fileName = filename.split('.')[0]+'_py.h'
    outfile = open(m_fileName,"w")
    outfile.write(hexString)
    outfile.close()
    print(f"File generated: {m_fileName}")


if __name__ == "__main__":
    image_name = "56x34.bmp"
    bmp2array(image_name)