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))))))