diff options
Diffstat (limited to 'image-format/pnm/image.scm')
-rw-r--r-- | image-format/pnm/image.scm | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/image-format/pnm/image.scm b/image-format/pnm/image.scm new file mode 100644 index 0000000..2e64752 --- /dev/null +++ b/image-format/pnm/image.scm @@ -0,0 +1,53 @@ +;;; 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)))))) |