# Make a bitmap using an array of RGB bytes plus a separate
# buffer for the alpha channel
bpp = 3 # bytes per pixel
- bytes = array.array('B', [1,2,3] * width*height)#*bpp)
+ bytes = array.array('B', [0] * width*height*bpp)
def offset(x, y):
# return the offset into the bytes array for the start of