| Re: IDLgrImage drawing performance with IDLgrPalette [message #46223] |
Tue, 08 November 2005 12:29 |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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RSI cleared this one up (Thanks!). FTR, the code relating to hardware
rendering of palettized images in IDL 6.1.1 was sub-optimal. This was
improved upon in 6.2.
-Rick
Rick Towler wrote:
> I stumbled upon this curiosity today and was wondering if I'm doing
> something wrong or if this is an "IDL thing" I have found that IDL is
> very slow at drawing indexed color images that use palettes to an RGB
> device. Or at least it is very slow using my approach. I generally use
> true color images so maybe I am missing something... Consider the
> following:
>
> pro test_palette
>
> ; read some image data, along with palette
> imgData = READ_PNG(FILEPATH('africavlc.png', $
> SUBDIRECTORY=['examples', 'data']), r, g, b)
> imgDims = SIZE(imgData, /DIMENSIONS)
>
> ; create the image object w/o a palette and add to a model
> oImg = OBJ_NEW('IDLgrImage', imgData)
> oMod = OBJ_NEW('IDLgrModel')
> oMod -> Add, oImg
>
> ; create a view and window
> oView = OBJ_NEW('IDLgrView', VIEWPLANE_RECT=[0,0,imgDims[0], $
> imgDims[1]])
> oView -> Add, oMod
> oWin = OBJ_NEW('IDLgrWindow', DIMENSIONS=imgDims)
>
> ; time drawing this image
> t0 = SYSTIME(/SECONDS)
> for n=0, 5 do oWin -> Draw, oView
> print, SYSTIME(/SECONDS) - t0
>
> ; Add a palette to the image object
> oPalette = OBJ_NEW('IDLgrPalette', r, g, b)
> oImg -> SetProperty, PALETTE=oPalette
>
> ; time drawing image with palette
> t0 = SYSTIME(/SECONDS)
> for n=0, 5 do oWin -> Draw, oView
> print, SYSTIME(/SECONDS) - t0
>
> OBJ_DESTROY, [oWin, oView, oMod, oPalette]
>
> end
>
> And the output:
> IDL> test_palette
> 0.00000000
> 27.626000
>
>
> I had to cut the iterations down to 5 because I didn't have the patience
> to sit thru the second test.
>
> What am I missing?
>
>
> IDL> print, !version
> { x86 Win32 Windows Microsoft Windows 6.1.1 Oct 11 2004 32 64}
>
>
> -Rick
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