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Bitmap/Read an image through a pipe: Difference between revisions
→{{header|Racket}}
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=={{header|Racket}}==
<lang racket>
(define (read-ppm port)
(parameterize ([current-input-port port])
(define magic (read-line))
(match-define (list w h) (string-split (read-line) " "))
(define width (string->number w))
(define height (string->number h))
(define maxcol (string->number (read-line)))
(define bm (make-object bitmap% width height))
(define dc (new bitmap-dc% [bitmap bm]))
(send dc set-smoothing 'unsmoothed)
(define (adjust v) (* 255 (/ v maxcol)))
(for/list ([x width])
(for/list ([y height])
(define red (read-byte))
(define green (read-byte))
(define blue (read-byte))
(define color (make-object color% (adjust red) (adjust green) (adjust blue)))
(send dc set-pen color 1 'solid)
(send dc draw-point x y)))
bm))
(define (image->bmp filename)
(define command (format "convert ~a ppm:-" filename))
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