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bmp2header.py
executable file
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/
bmp2header.py
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#!/usr/bin/env python3
# coding: utf-8
################################################################################
# BMPファイルをヘッダファイルに変換します
#
################################################################################
# 使用、改変、再配布は自由に行えますが、無保証です。権利情報の改変は不可です。
# Copyright (c) 2020-2023 Wataru KUNINO
#
# 引用元：
# https://github.com/bokunimowakaru/m5camera/blob/master/tools/gz2header.py
################################################################################
# 参考文献
# https://algorithm.joho.info/image-processing/bmp-file-data-header/
# https://algorithm.joho.info/programming/python/bitmap-file-header-read/
filename = ''
n = 0
from time import sleep
from sys import argv # 本プログラムの引数argvを取得する
print(argv[0]) # プログラム名を表示する
while len(argv) >= 2:
filename = argv[1]
del argv[1]
n = filename.find('.bmp')
if n > 0:
saveto = filename[0:n] + '_bmp.h'
else:
print('ERROR', filename)
continue
print('input filename =',filename)
print('output filename =',saveto)
fp = open(filename, mode='br')
data_array = fp.read()
fp.close()
for i in range(54): # ヘッダ処理
print("0x" + format(data_array[i], '02X'), end=", ")
if i % 16 == 15:
print("")
print("")
# ヘッダ部の情報を切り分け
# https://algorithm.joho.info/programming/python/bitmap-file-header-read/
format_type = data_array[0:2] # 画像フォーマットの種類を取得
file_size = data_array[2:6] # ファイルサイズを取得
header_size = data_array[10:14] # ヘッダサイズを取得
width, height = data_array[18:22], data_array[22:26] # 画像の高さと幅を取得
color_bit = data_array[28:30] # 1画素の色数を取得
# リトルエンディアン方式で16進数から10進数に変換
# https://algorithm.joho.info/programming/python/bitmap-file-header-read/
file_size = int.from_bytes(file_size, 'little')
header_size = int.from_bytes(header_size, 'little')
width = int.from_bytes(width, 'little')
height = int.from_bytes(height, 'little')
color_bit = int.from_bytes(color_bit, 'little')
# ヘッダ情報をコンソール出力
# https://algorithm.joho.info/programming/python/bitmap-file-header-read/
print("Format type :", format_type.decode())
print("File size :", file_size, "[byte]", ", len =",len(data_array))
print("Header size :", header_size, "[byte]")
print("Width :", width, "[px]")
print("Height :", height, "[px]")
print("Total pixels :", width*height)
print("Color :", color_bit, "[bit]")
if format_type != b'BM':
print("ERROR format_type", 'BM', format_type.decode())
exit()
if file_size - header_size < width * height * int(color_bit/8):
print("ERROR file_size",file_size - header_size, width * height * int(color_bit/8))
exit()
if len(data_array) < file_size - header_size:
print("ERROR len(data_array)",len(data_array), file_size - header_size)
exit()
out = []
# for d in data_array[header_size:]:
# out.append(d)
for y in range(height):
for x in range(width):
p = (height - y - 1) * width + x
p *= int(color_bit/8)
p += header_size
for bit in range(int(color_bit/8)):
try:
out.append(data_array[p])
except Exception as e:
print(e)
print("p =",p, ", height =",height, ", width =",width, ", x =",x, ", y =",y)
exit()
p += 1
bmp_len = len(out)
if color_bit == 16:
bmp_len = int(bmp_len / 2)
if color_bit == 24:
bmp_len = int(bmp_len / 3)
fp = open(saveto, mode='w')
print('#define '+filename[0:n]+'_bmp_len',bmp_len, file = fp)
print('#define '+filename[0:n]+'_bmp_x',width, file = fp)
print('#define '+filename[0:n]+'_bmp_y',height, file = fp)
print('const uint16_t '+filename[0:n]+'_bmp[] = {', file = fp)
i=0
rgb565 = 0;
bit = 0
for d in out:
if bit == 0:
rgb565 = 0
if color_bit == 8:
rgb565 = ((d>>3)<<11) | ((d>>2)<<5) | (d>>3)
if color_bit == 16:
rgb565 |= d<<(8 * bit)
if color_bit == 24:
if bit == 0:
rgb565 |= ((d>>3)<<11)
elif bit == 1:
rgb565 |= ((d>>2)<<5)
elif bit == 2:
rgb565 |= (d>>3)
bit += 1
if bit * 8 == color_bit:
bit = 0
print(' 0x' + format(rgb565, '04X'), end='', file = fp)
i += 1
if i % 16 == 0:
print(',', file = fp)
else:
if i < len(out):
print(',', end='', file = fp)
print('\n};', file = fp)
# print('bmp_len =', bmp_len, i)
fp.close()
print('Done\n')