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(define-library (pnm image)
(export make-image
image?
image-type
image-width
image-height
image-maxval
image-data
image-pixel-getter
image-pixel-setter
image-ref
image-set!)
(import (scheme base)
(scheme case-lambda))
(begin
(define-record-type <image>
(make-image type width height maxval data pixel-getter pixel-setter)
image?
(type image-type)
(width image-width)
(height image-height)
(maxval image-maxval)
(data image-data)
(pixel-getter image-pixel-getter)
(pixel-setter image-pixel-setter))
(define (image-ref image x y)
((image-pixel-getter image) x y))
(define image-set!
(case-lambda
((image x y v)
((image-pixel-setter image) x y v))
((image x y r g b)
((image-pixel-setter image) x y r g b))))))
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