blob: b41a0d9d05f48bb41efd879b7f094152036e5a05 (
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
|
;;; 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 write)
(export image-write)
(import (scheme base)
(pnm image))
(begin
(define (image-write image out)
(define (write-string-u8 str)
(string-for-each (lambda (c) (write-u8 (char->integer c) out))
str))
(case (image-type image)
((ppm)
(write-string-u8 "P6\n"))
((pgm)
(write-string-u8 "P5\n"))
(else
(error "(pnm write) pnm-write: Not supported type" (image-type image))))
(write-string-u8 (number->string (image-width image)))
(write-string-u8 "\n")
(write-string-u8 (number->string (image-height image)))
(write-string-u8 "\n")
(case (image-type image)
((pgm ppm)
(write-string-u8 (number->string (image-maxval image)))
(write-string-u8 "\n")))
(write-bytevector (image-data image) out))))
|
