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(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))))
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