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bitmap-dc% respective alpha channel in get/set-pixel

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Jay McCarthy 2013-05-11 10:36:11 -06:00
parent a80e04136b
commit 551e536f3e
1 changed files with 6 additions and 2 deletions
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8
collects/racket/draw/private/bitmap-dc.rkt
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@ -119,14 +119,18 @@
(internal-get-bitmap))
(define/public (set-pixel x y c)
(let ([s (bytes 255 (color-red c) (color-green c) (color-blue c))])
(let ([s (bytes (inexact->exact (round (* 255 (color-alpha c))))
(color-red c)
(color-green c)
(color-blue c))])
(set-argb-pixels x y 1 1 s)))
(define/public (get-pixel x y c)
(let-values ([(w h) (get-size)])
(let ([b (make-bytes 4)])
(get-argb-pixels x y 1 1 b)
(send c set (bytes-ref b 1) (bytes-ref b 2) (bytes-ref b 3))
(send c set (bytes-ref b 1) (bytes-ref b 2) (bytes-ref b 3)
(/ (bytes-ref b 0) 255))
(and (<= 0 x w) (<= 0 y h)))))
(define/public (set-argb-pixels x y w h bstr