# an image to save
ground-ceiling.png
# its size
256 256

# source.x source.y source.w source.h target.x target.y
128 0 256 128 0 0
128 384 256 128 0 128

# save
write

# an image to save
wall-fill.png
# its size
256 256

# source.x source.y source.w source.h target.x target.y
128 128 256 256 0 0

# save
write

# an image to save
wall-corner.png
# its size
256 256

# source.x source.y source.w source.h target.x target.y
0 128 128 256 0 0
0 0 128 128 128 0
0 384 128 128 128 128

# save
write

