[5285] in java-interest
Re: Question: quick Image crop/copy/draw?
daemon@ATHENA.MIT.EDU (Greg Ewing)
Mon Feb 5 07:35:08 1996
Date: Mon, 5 Feb 1996 16:45:23 +1100
From: grege@optimation.com.au (Greg Ewing)
To: java-interest@java.sun.com
Cc: khkramer@bitwise.net
> From henryg Mon Feb 5 12:43 EST 1996
> From: NewsGroup_comp-lang-java
> >From: Kwin Kramer <khkramer@bitwise.net>
> Subject: Question: quick Image crop/copy/draw?
> Date: Sun, 04 Feb 1996 18:04:57 -0500
> Nntp-Posting-Host: khkramer.student.harvard.edu
> Mime-Version: 1.0
> Content-Transfer-Encoding: 7bit
>
> Hi,
>
> I have written a custom awt component that works great, but is much, much slower
> repainting itself than I expected.
>
> The following (pseudo) code -- in which a small Image is copied out of a much
> larger reference Image -- seems to be the bottleneck:
>
> public Image getPieceOfImage() {
> CropImageFilter crop = new CropImageFilter( someX, someY, someW, someH)
> ImageProducer imgSrc = wholeBigImage.getSource();
> Image pieceOfBigImage = createImage( new FilteredImageSource( imgSrc ,
> crop ) );
> return pieceOfBigImage;
> }
>
> I can't figure out how to make this faster. Is there a createSubImage or
> copyNewImage or some other perfect solution that I have missed? Does anyone have
> any suggestions as to how to accomplish this in a better/faster way? The large
> image varies in size, but could typically be 500x1500. The smaller image returned
> by the method is intended to be drawn on a canvas, so it's smaller than the
> screen size.
>
> Yours,
> Kwin Kramer
Kwin,
I have the same problem (incredibly slow) when I use a FilteredImageSource. The same
slowdown happens when I do a drawImage() to a target image with a larger dimension
(this has the same effect as scaling the image to the new dimension).
If you get any clues please let me know.
GREG
grege@optimation.com.au
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