Re: [wxhaskell-users] is imageCreateFromPixelArray "safe"?

[Conal E. <co...@co...>]

Thanks.  I'm using the function as pure, and so far, so good.  Cheers,  -
Conal

On 9/2/07, shelarcy <she...@gm...> wrote:
>
> Hi Conal,
>
> On Wed, 29 Aug 2007 09:42:15 +0900, Conal Elliott <co...@co...> wrote:
> > Is there any reason for imageCreateFromPixelArray to be in IO?  I want
> to
> > use it as a pure function (via unsafePerformIO), and I'm wondering if
> there
> > are any gotchas.   - Conal
>
> I think it's just implementation reason.
>
> imageCreateFromPixelArray create pixelBuffer and set pixelBuffer
> color interanally, and then create image by pixelBuffer.
>
>
> imageCreateFromPixelArray :: Array Point Color -> IO (Image ())
> imageCreateFromPixelArray pixels
>    = let (Point x y) = snd (bounds pixels)
>      in imageCreateFromPixels (sz (x+1) (y+1)) (elems pixels)
>
> imageCreateFromPixels :: Size -> [Color] -> IO (Image ())
> imageCreateFromPixels size colors
>    = do pb <- pixelBufferCreate size
>         pixelBufferSetPixels pb colors
>         imageCreateFromPixelBuffer pb   -- image deletes pixel buffer
>
> http://darcs.haskell.org/wxhaskell/wxcore/src/Graphics/UI/WXCore/Image.hs
>
>
> So I think we can use this function as a safe one.
>
> Best Regards,
>
> --
> shelarcy <shelarcy    hotmail.co.jp>
> http://page.freett.com/shelarcy/
>