blob: ceab0cfbb574c0d08d9c3f459f371bd2f40d6dc8 (
about) (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
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 (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))))))
|
