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;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS
;;; Copyright © 2024 Masaya Tojo <masaya@tojo.tokyo>
;;;
;;; This file is part of R7RS-PNM.
;;;
;;; R7RS-PNM is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as published
;;; by the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; R7RS-PNM is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public License
;;; along with R7RS-PNM. If not, see <https://www.gnu.org/licenses/>.
(define-library (image-format pnm image)
(export make-pnm-image
pnm-image?
pnm-image-type
pnm-image-width
pnm-image-height
pnm-image-maxval
pnm-image-data
pnm-image-pixel-getter
pnm-image-pixel-setter
pnm-image-ref
pnm-image-set!)
(import (scheme base)
(scheme case-lambda))
(begin
(define-record-type <pnm-image>
(make-pnm-image type width height maxval data pixel-getter pixel-setter)
pnm-image?
(type pnm-image-type)
(width pnm-image-width)
(height pnm-image-height)
(maxval pnm-image-maxval)
(data pnm-image-data)
(pixel-getter pnm-image-pixel-getter)
(pixel-setter pnm-image-pixel-setter))
(define (pnm-image-ref pnm-image x y)
((pnm-image-pixel-getter pnm-image) x y))
(define pnm-image-set!
(case-lambda
((pnm-image x y v)
((pnm-image-pixel-setter pnm-image) x y v))
((pnm-image x y r g b)
((pnm-image-pixel-setter pnm-image) x y r g b))))))
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