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jpg_to_sjpg.py
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jpg_to_sjpg.py
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#!/usr/bin/env python3
##################################################################
# sjpeg converter script version 1.0
# Dependencies: (PYTHON-3)
##################################################################
SJPG_FILE_FORMAT_VERSION = "V1.00" #
JPEG_SPLIT_HEIGHT = 16
##################################################################
import math, os, sys, time
from PIL import Image
OUTPUT_FILE_NAME = ""
INPUT_FILE = ""
if len(sys.argv) == 2:
INPUT_FILE = sys.argv[1]
OUTPUT_FILE_NAME = INPUT_FILE.split("/")[-1].split("\\")[-1].split(".")[0]
else:
print("usage:\n\t python " + sys.argv[0] + " input_file.jpg")
sys.exit(0)
try:
im = Image.open(INPUT_FILE)
except:
print("\nFile not found!")
sys.exit(0)
print("\nConversion started...\n")
start_time = time.time()
width, height = im.size
print("Input:")
print("\t" + INPUT_FILE)
print("\tRES = " + str(width) + " x " + str(height) + '\n')
lenbuf = []
block_size = JPEG_SPLIT_HEIGHT;
splits = math.ceil(height/block_size)
c_code = '''//LVGL SJPG C ARRAY\n#include "lvgl/lvgl.h"\n\nconst uint8_t ''' + OUTPUT_FILE_NAME + '''_map[] = {\n'''
sjpeg_data = bytearray()
sjpeg = bytearray()
row_remaining = height;
for i in range(splits):
if row_remaining < block_size:
crop = im.crop((0, i*block_size, width, row_remaining + i*block_size))
else:
crop = im.crop((0, i*block_size, width, block_size + i*block_size))
row_remaining = row_remaining - block_size;
crop.save(str(i)+".jpg", quality=90)
for i in range(splits):
f = open(str(i)+".jpg", "rb")
a = f.read()
f.close()
sjpeg_data = sjpeg_data + a
lenbuf.append(len(a))
header = bytearray()
#4 BYTES
header = header + bytearray("_SJPG__".encode("UTF-8"));
#6 BYTES VERSION
header = header + bytearray(("\x00" + SJPG_FILE_FORMAT_VERSION + "\x00").encode("UTF-8"));
#WIDTH 2 BYTES
header = header + width.to_bytes(2, byteorder='little');
#HEIGHT 2 BYTES
header = header + height.to_bytes(2, byteorder='little');
#NUMBER OF ITEMS 2 BYTES
header = header + splits.to_bytes(2, byteorder='little');
#NUMBER OF ITEMS 2 BYTES
header = header + int(JPEG_SPLIT_HEIGHT).to_bytes(2, byteorder='little');
for item_len in lenbuf:
# WIDTH 2 BYTES
header = header + item_len.to_bytes(2, byteorder='little');
data = bytearray()
sjpeg = header + sjpeg_data;
if 1:
for i in range(len(lenbuf)):
os.remove(str(i) + ".jpg")
f = open(OUTPUT_FILE_NAME+".sjpg","wb");
f.write(sjpeg)
f.close()
new_line_threshold = 0
for i in range(len(sjpeg)):
c_code = c_code + "\t" + str(hex(sjpeg[i])) + ","
new_line_threshold = new_line_threshold + 1
if (new_line_threshold >= 16):
c_code = c_code + "\n"
new_line_threshold = 0
c_code = c_code + "\n};\n\nlv_image_dsc_t "
c_code = c_code + OUTPUT_FILE_NAME + " = {\n"
c_code = c_code + "\t.header.always_zero = 0,\n"
c_code = c_code + "\t.header.w = " + str(width) + ",\n"
c_code = c_code + "\t.header.h = " + str(height) + ",\n"
c_code = c_code + "\t.data_size = " + str(len(sjpeg)) + ",\n"
c_code = c_code + "\t.header.cf = LV_IMG_CF_RAW,\n"
c_code = c_code + "\t.data = " + OUTPUT_FILE_NAME+"_map" + ",\n};"
f = open(OUTPUT_FILE_NAME + '.c', 'w')
f.write(c_code)
f.close()
time_taken = (time.time() - start_time)
print("Output:")
print("\tTime taken = " + str(round(time_taken,2)) + " sec")
print("\tbin size = " + str(round(len(sjpeg)/1024, 1)) + " KB" )
print("\t" + OUTPUT_FILE_NAME + ".sjpg\t(bin file)" + "\n\t" + OUTPUT_FILE_NAME + ".c\t\t(c array)")
print("\nAll good!")