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"""
Converts input image to a c header with image data for
Waveshare 7.5-inch e-paper display (V2) using ImageMagick.
Usage: python -m imgtool image.jpg offset_x offset_y
"""
import os
import re
import sys
import subprocess
src = sys.argv[1]
offset_x = int(sys.argv[2])
offset_y = int(sys.argv[3])
file_name = src.replace("." + src.split('.')[-1], "")
dst = file_name + ".h"
header = file_name.upper() + "_IMG_H"
rv = subprocess.run(
["identify", "-ping", "-format", "%w %h", src],
capture_output=True,
text=True
)
dim = rv.stdout.split(' ')
width = int(dim[0])
height = int(dim[1])
print("Detected image size: {}x{}".format(width, height))
subprocess.run(["convert", src, "-threshold", "80%", "mon.jpg"])
subprocess.run(["convert", "mon.jpg", "-depth", "1", "-format", "'txt'", "mon.txt"])
n = 7
x = 0
column_len = 0
byte_count = 0
res = width * height
image_size = (res // 8) + (res % 8 > 0)
with open(dst, "w") as o:
o.write("#ifndef {}\n".format(header))
o.write("#define {}\n\n".format(header))
o.write("const int {0}_width = {1};\n".format(file_name, width))
o.write("const int {0}_height = {1};\n\n".format(file_name, height))
o.write("const int {0}_offset_x = {1};\n".format(file_name, offset_x))
o.write("const int {0}_offset_y = {1};\n\n".format(file_name, offset_y))
o.write("const unsigned char {0}_bmp[{1}] = {{\n\t".format(file_name, image_size))
with open("mon.txt", "r") as i:
i.readline()
for line in i:
px = re.search("\([^\)]+\)", line).group()
if px == "(0)":
x |= (1 << n)
n -= 1
if n < 0:
o.write("0x{:02X}, ".format(x))
column_len += 1
byte_count += 1
if column_len >= 12:
o.write("\n\t")
column_len = 0
x = 0
n = 7
if res % 8 != 0:
o.write("0x{:02X}, ".format(x))
byte_count += 1
o.write("\n};\n\n")
o.write("#endif")
os.remove("mon.jpg")
os.remove("mon.txt")
if (image_size != byte_count):
raise Exception("Detected image size {} and bytes written {} not equal".format(image_size, byte_count))
print("Wrote {} bytes of image data to {}".format(byte_count, dst))
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