from array import array
class bmp:
 """ bmp data structure """
 def __init__(self, w=1080, h=1920, color = 0xffffff):
  self.w = w
  self.h = h
  self.gen_bmp_header()
  self.paint_bgcolor(color)
 def calc_data_size (self):
  if((self.w*3)%4 == 0):
self.dataSize = self.w * 3 * self.h
  else:
self.dataSize = (((self.w * 3) // 4 + 1) * 4) * self.h
  self.fileSize = self.dataSize + 54
 def conv2byte(self, l, num, len):
  tmp = num
  for i in range(len):
l.append(tmp & 0x000000ff)
tmp >>= 8
 def gen_bmp_header (self):
  self.calc_data_size();
  self.bmp_header = [0x42, 0x4d]
  self.conv2byte(self.bmp_header, self.fileSize, 4) #file size
  self.conv2byte(self.bmp_header, 0, 2)
  self.conv2byte(self.bmp_header, 0, 2)
  self.conv2byte(self.bmp_header, 54, 4) #rgb data offset
  self.conv2byte(self.bmp_header, 40, 4) #info block size
  self.conv2byte(self.bmp_header, self.w, 4)
  self.conv2byte(self.bmp_header, self.h, 4)
  self.conv2byte(self.bmp_header, 1, 2)
  self.conv2byte(self.bmp_header, 24, 2) #888
  self.conv2byte(self.bmp_header, 0, 4)  #no compression
  self.conv2byte(self.bmp_header, self.dataSize, 4) #rgb data size
  self.conv2byte(self.bmp_header, 0, 4)
  self.conv2byte(self.bmp_header, 0, 4)
  self.conv2byte(self.bmp_header, 0, 4)
  self.conv2byte(self.bmp_header, 0, 4)
 def print_bmp_header (self):
  length = len(self.bmp_header)
  for i in range(length):
print("{:0>2x}".format(self.bmp_header[i]), end=' ')
if i%16 == 15:
 print('')
  print('')
 def paint_bgcolor(self, color=0xffffff):
  self.rgbData = []
  for r in range(self.h):
self.rgbDataRow = []
for c in range(self.w):
 self.rgbDataRow.append(color)
self.rgbData.append(self.rgbDataRow)
 def paint_line(self, x1, y1, x2, y2, color):
  k = (y2 - y1) / (x2 - x1)
  for x in range(x1, x2+1):
y = int(k * (x - x1) + y1)
self.rgbData[y][x] = color
 def paint_rect(self, x1, y1, w, h, color):
  for x in range(x1, x1+w):
for y in range(y1, y1+h):
 self.rgbData[y][x] = color
 def paint_point(self, x, y, color=0x000000):
  self.rgbData[y][x] = color
 def save_image(self, name="save.bmp"):
  f = open(name, 'wb')
  #write bmp header
  f.write(array('B', self.bmp_header).tobytes())
  #write rgb data
  zeroBytes = self.dataSize // self.h - self.w * 3
  for r in range(self.h):
l = []
for i in range(len(self.rgbData[r])):
 p = self.rgbData[r][i]
 l.append(p & 0x0000ff)
 p >>= 8
 l.append(p & 0x0000ff)
 p >>= 8
 l.append(p & 0x0000ff)
f.write(array('B', l).tobytes())
for i in range(zeroBytes):
 f.write(bytes([0x00]))
  #close file
  f.close()
if __name__ == '__main__':

 image = bmp(35, 35)
 for i in range(35):
  image.paint_point(i, i, 0xff0000)
 image.save_image("save1.bmp")
 import os
 os.system("save1.bmp")