import logging
def LE32write(buf, i, value):
buf[i] = value & 0xff
buf[i+1] = (value>>8) & 0xff
buf[i+2] = (value>>16) & 0xff
buf[i+3] = (value>>24) & 0xff
class bmp24():
def __init__(self, width = 160, height = 120):
self._bitmap = {}
self.width = width
self.height = height
self.header = [
0x42,0x4d,0x36,0xe1,0x00,0x00,0x00,0x00,0x00,0x00,0x36,0x00,0x00,0x00,0x28,0x00,
0x00,0x00,0xa0,0x00,0x00,0x00,0x78,0x00,0x00,0x00,0x01,0x00,0x18,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00]
def point(self, x, y, rgb=(0,0,0)):
self._bitmap[(x, y)] = rgb
def output_string(self):
width3 = self.width * 3
null_count = 0
if (width3 % 4) != 0:
null_count = 4 - (width3 % 4)
width3 += null_count
file_size = len(self.header) + width3 * self.height
self.header[0:2] = [0x42, 0x4d]
LE32write(self.header, 2, file_size)
LE32write(self.header, 18, self.width)
LE32write(self.header, 22, self.height)
r = ""
for c in self.header:
r += chr(c)
for y in range(self.height-1, -1, -1):
for x in range(self.width):
if (x, y) in self._bitmap:
rgb = self._bitmap[(x, y)]
else:
rgb = (255, 255, 255)
r += chr(rgb[2]) + chr(rgb[1]) + chr(rgb[0])
for i in range(null_count):
r += chr(0x00)
logging.info("BMP length: %d" % len(r))
return r
if __name__=="__main__":
logging.basicConfig(level=logging.INFO)
image = bmp24(320,240)
for y in range(image.height):
image.point(y, y, (255,0,0))
image.point(y+2, y, (0,255,0))
image.point(y+4, y, (0,0,255))
image.point(y+6, y)
image_data = image.output_string()
with open("output.bmp", "wb") as f:
f.write(image_data)
