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Loading ICO images [message #512906]

Mon, 08 February 2010 05:30

Eclipse User

Hi,

I am writing a RAP application and have a problem loading some ICO images. Unfortunately converting them to PNG or anything else does not seem to be an option.

Basically the following code in a RAP application:

 String imgNam = ...
 byte[] icoDat = ...
 ...
 Graphics.getImage( imgNam, new ByteArrayInputStream( icoDat ) );

throws the Exception:

java.lang.IllegalArgumentException: Empty region!
	at javax.imageio.ImageReader.computeRegions(Unknown Source)
	at com.sun.imageio.plugins.wbmp.WBMPImageReader.read(Unknown Source)
	at javax.imageio.ImageIO.read(Unknown Source)
	at javax.imageio.ImageIO.read(Unknown Source)

Loading the images in an SWT application with:

new Image(display, new ByteArrayInputStream( icoDat ) );

works just fine. I tried the same code in RAP but got the aforementioned exception.

Is the wrong JAI plug-in being picked here ? I guess that the ICO images are really partially corrupt, but they are still loaded by a legacy application and the SWT application, so I would like to be able to do the same in RAP.

I would be grateful for any help.

Re: Loading ICO images [message #512927 is a reply to message #512906]

Mon, 08 February 2010 06:28

Eclipse User

if there weren't an exception, RAP would pass them through to the
browser. That means, the image is stored in a location on the server's
hard drive that is accessible from outside.
Ultimately it is the browser that displays images. Thus before you dig
deeper into resolving the exception you should make sure that you can
display the ICO images in all relevant browsers.

HTH
Rüdiger
--
Rüdiger Herrmann
http://eclipsesource.com

On 08.02.2010 11:30, tibersept wrote:
> Hi,
>
> I am writing a RAP application and have a problem loading some ICO
> images. Unfortunately converting them to PNG or anything else does not
> seem to be an option.
> Basically the following code in a RAP application:
>
> String imgNam = ...
> byte[] icoDat = ...
> ...
> Graphics.getImage( imgNam, new ByteArrayInputStream( icoDat ) );
>
> throws the Exception:
>
> java.lang.IllegalArgumentException: Empty region!
> at javax.imageio.ImageReader.computeRegions(Unknown Source)
> at com.sun.imageio.plugins.wbmp.WBMPImageReader.read(Unknown Source)
> at javax.imageio.ImageIO.read(Unknown Source)
> at javax.imageio.ImageIO.read(Unknown Source)
>
> Loading the images in an SWT application with:
>
> new Image(display, new ByteArrayInputStream( icoDat ) );
>
> works just fine. I tried the same code in RAP but got the aforementioned
> exception.
> Is the wrong JAI plug-in being picked here ? I guess that the ICO images
> are really partially corrupt, but they are still loaded by a legacy
> application and the SWT application, so I would like to be able to do
> the same in RAP.
> I would be grateful for any help.
>
>
>
>

Re: Loading ICO images [message #512939 is a reply to message #512927]

Mon, 08 February 2010 07:02

Eclipse User

Hi Rüdiger,

I did check whether the browsers can display these ICO images and all of the relevant ones actually managed fine. So I assume that passing those images to the browser will be ok. Thanks for the tip.

Re: Loading ICO images [message #512981 is a reply to message #512939]

Mon, 08 February 2010 08:55

Eclipse User

note that RAP currently uses a different mechanism to load images than
SWT. In SWT there is an ImageLoader, but RAP - for historic reasons -
uses javax.imageio.
This issue is covered here:
285539: Use SWT to determine image size
https://bugs.eclipse.org/bugs/show_bug.cgi?id=285539
Feel free to attach the non-working image to this bug or file a new bug.
In the meanwhile a JAI plug-in (AC.lib-ICO [1]?) might help.

[1] http://sourceforge.net/projects/aclibico

On 08.02.2010 13:02, tibersept wrote:
> Hi Rüdiger,
>
> I did check whether the browsers can display these ICO images and all of
> the relevant ones actually managed fine. So I assume that passing those
> images to the browser will be ok. Thanks for the tip.

Re: Loading ICO images [message #512998 is a reply to message #512981]

Mon, 08 February 2010 09:29

Eclipse User

Ok, thank you for pointing out the bug. I will try finding a workaround.

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