Re: [wxhaskell-users] How to make the Filter programm?

[shelarcy <she...@ca...>]

On Sun, 11 Apr 2004 16:22:23 +0200, Daan Leijen <daa...@xs...> 
wrote:
>> I was making a Filter (Low pass Filter) programm in wxHaskell.
>> [snip]
>>
>>                     im <- imageCreateFromBitmap bm
>>                     pxe <- imageGetPixelBuffer im
>> [snip]
>>                     fillpixelBuffer pxe
>>                     bm2  <- bitmapCreateFromImage im (-1)
>> [snip]
>>
>> But these code doesn't work.
>>
>> Where is wrong?
>
> I think that when you get the pixelbuffer from an image, you get a fresh 
> copy
> and you are not manipulating the image itself. So, you probably need to 
> use
> "imageCreateFromPixelBuffer" to create a new "image" from the 
> pixelbuffer again.
> (See the "PaintDirect" sample in the contrib directory)
>
> I hope this helps,
> All the best,
>   Daan.

I changed my programm under that advice, but programm doesn't work yet.
I'm thinking that reason many time ... Do I misunderstand your message?

let fillpixelBuffer pb = do
                            mapM_ (drawLowpassFilter pb) (pixelPoint bsz 0)
                            return pb
                     px2 <- fillpixelBuffer pxe
                     im2 <-imageCreateFromPixelBuffer px2
                     bm2  <- bitmapCreateFromImage im2 (-1)
                     drawBitmap dc bm2 pointZero True []




-- 
shelarcy <she...@ca...>
http://page.freett.com/shelarcy/