[4954] in java-interest
Re: PixelGrabber problem (Solved)
daemon@ATHENA.MIT.EDU (Vitaly Promislov)
Wed Jan 24 07:54:42 1996
Date: Wed, 24 Jan 96 14:37:43 ???
From: vitaly@diogen.asc.rssi.ru (Vitaly Promislov)
To: igs@sunrock.East.Sun.COM
Cc: java-interest@java.sun.com
> From igs@sunrock.East.Sun.COM Tue Jan 23 22:29:46 1996
> Sender: igs@sunrock.East.Sun.COM
> Date: Tue, 23 Jan 1996 14:10:54 -0500
> From: Irv Salisbury <igs@sunrock.East.Sun.COM>
> Organization: Sun Microsystems
> X-Mailer: Mozilla 2.0b6a (X11; I; SunOS 5.5 sun4c)
> Mime-Version: 1.0
> To: Vitaly Promislov <vitaly@diogen.asc.rssi.ru>
> Subject: Re: PixelGrabber problem (Need Help)
> Content-Type> : > text/plain> ; > charset=us-ascii>
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>
> Vitaly Promislov wrote:
> >
> > Hi All
> > I met problem with PixelGrabber.
> > I create empty offscreen image with createImage(w,h) method and after
> > some drawing on this context try to grab pixel from offscreen image
> > but have to wait forever.
> > Thre is small example:
> >
> > {
> > Image img;
> > Graphics g;
> >
> > img=obs.createImage(width,height);
> > g=img.getGraphics();
> >
> > pix_src= new int[width*height];
> >
> > g.fillRect(0,0,width,height);
> >
> > PixelGrabber pg = new PixelGrabber(img, 0, 0, width, height, pix_src, 0, width);
> > boolean stat=false;
> >
> > try {
> > stat=pg.grabPixels(); // ???? hang up here
> > } catch (InterruptedException e) {
> > System.err.println("interrupted waiting for pixels!");
> > return;
> > }
> >
> > }
> >
> > if(stat == false)
> > if ((pg.status() & ImageObserver.ABORT) != 0) {
> > System.err.println("image fetch aborted or errored");
> > return;
> > }
> >
> > Thank you
> >
> > Vitaly Promislov
> > Astro Space Center, Russia e-mail: vitaly@diogen.asc.rssi.ru
> > fax: 095 333-23-78
> > Phone: 333-23-12
> > URL: http://diogen.asc.rssi.ru/Vitaly.html
> > ----------------------------------------------------------------------
> > These are my opinions only, and do not reflect anything
> > about my employer, Astro Space Center of Russina Academy of Science.
> > ------------------------------------------------------------------------
> > -
> > This message was sent to the java-interest mailing list
> > Info: send 'help' to java-interest-request@java.sun.com
>
> When I tried this my computer also hung at the same spot. Have you
> tried this with a jpeg image?
>
> Anyway, I had implemented this in a different way using ImageConsumer
> and ImageProducer to get at the pixels. I then used the pixels to
> rotate theimage and used MemoryImageSource to reproduce the rotated
> image. If you would like to take a look at it I am sure I could send it
> to you.
>
> If you have any breakthroughs with PixelGrabber let me know.
>
Hi Irv
I succeed to pass through PixelGrabber. It seems It works with offscreen
image OK. I modified source this way:
{
Image img;
Graphics g;
img=createImage(width,height);
g=img.getGraphics();
pix_src= new int[width*height];
g.fillRect(0,0,width,height);
PixelGrabber pg = new PixelGrabber(img, 0, 0, width, height, pix_src, 0, width); boolean stat=false;
img.getSource().addConsumer(pg); // It must be DONE !!!
try {
stat=pg.grabPixels(); // NO hang up here
} catch (InterruptedException e) {
System.err.println("interrupted waiting for pixels!");
return;
}
}
if(stat == false)
if ((pg.status() & ImageObserver.ABORT) != 0) {
System.err.println("image fetch aborted or errored");
return;
}
Anyway If you send me your code I will be glad to look it through.
Thank you
Vitaly.
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