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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 (pnm image)
(export make-image
image?
image-type
image-width
image-height
image-maxval
image-data
image-pixel-reader
image-pixel-writer
image-pixel-read
image-pixel-write!)
(import (scheme base)
(scheme case-lambda))
(begin
(define-record-type <image>
(make-image type width height maxval data pixel-reader pixel-writer)
image?
(type image-type)
(width image-width)
(height image-height)
(maxval image-maxval)
(data image-data)
(pixel-reader image-pixel-reader)
(pixel-writer image-pixel-writer))
(define (image-pixel-read image x y)
((image-pixel-reader image) x y))
(define image-pixel-write!
(case-lambda
((image x y v)
((image-pixel-writer image) x y v))
((image x y r g b)
((image-pixel-writer image) x y r g b))))))
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