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Problem with DecorationOverlayIcon [message #134637]

Tue, 02 June 2009 10:08

Dmitry Pryadkin

Messages: 146
Registered: July 2009

Senior Member

This is a multi-part message in MIME format.
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Hello everybody,

Recently I've experienced a strange problem. I have a TableViewer with
decorated icons in its items.

At some point I call ColumnViewer#refresh to update decorations.

I'm receiving com.sun.imageio.plugins.png.PNGImageReader exception.
Stack trace is provided along with the png image.

com.sun.imageio.plugins.png.PNGImageReader#readImage at 1253 has thrown
an IOException from decodeImage().

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Re: Problem with DecorationOverlayIcon [message #134650 is a reply to message #134637]

Tue, 02 June 2009 10:50

Dmitry Pryadkin

Messages: 146
Registered: July 2009

Senior Member

I've been reading comments by Frank Appel in
ResourceFactory#createImage. The following testcase shows that the
approach is erroneous.

The img.png is the one I attached to my referenced message.

try
{
InputStream inputStream = new FileInputStream("c:\\img.png");

BufferedInputStream bis = new BufferedInputStream( inputStream );

try
{
ImageIO.setUseCache( false );
BufferedImage buf = ImageIO.read(bis);
}
catch (IOException e)
{
e.printStackTrace();
}
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}

Dmitry Pryadkin wrote:
> Hello everybody,
>
> Recently I've experienced a strange problem. I have a TableViewer with
> decorated icons in its items.
>
> At some point I call ColumnViewer#refresh to update decorations.
>
> I'm receiving com.sun.imageio.plugins.png.PNGImageReader exception.
> Stack trace is provided along with the png image.
>
> com.sun.imageio.plugins.png.PNGImageReader#readImage at 1253 has thrown
> an IOException from decodeImage().
>
>

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Re: Problem with DecorationOverlayIcon [message #134714 is a reply to message #134650]

Tue, 02 June 2009 11:35

Rüdiger Herrmann

Messages: 581
Registered: July 2009

Senior Member

The image itself seems to cause the problem. Reading it directly
also results in an exception:
InputStream inputStream = new FileInputStream( "c:\\imgage.png" );
ImageIO.read( inputStream );
raises the same exception as your code.
Some image-viewing-progreams also refuse to show the image.

Dmitry Pryadkin wrote:
> I've been reading comments by Frank Appel in
> ResourceFactory#createImage. The following testcase shows that the
> approach is erroneous.
>
> The img.png is the one I attached to my referenced message.
>
> try
> {
> InputStream inputStream = new FileInputStream("c:\\img.png");
> BufferedInputStream bis = new BufferedInputStream( inputStream );
>
> try
> {
> ImageIO.setUseCache( false );
> BufferedImage buf = ImageIO.read(bis);
> }
> catch (IOException e)
> {
> e.printStackTrace();
> }
> }
> catch (FileNotFoundException e)
> {
> e.printStackTrace();
> }
>
> Dmitry Pryadkin wrote:
>> Hello everybody,
>>
>> Recently I've experienced a strange problem. I have a TableViewer with
>> decorated icons in its items.
>>
>> At some point I call ColumnViewer#refresh to update decorations.
>>
>> I'm receiving com.sun.imageio.plugins.png.PNGImageReader exception.
>> Stack trace is provided along with the png image.
>>
>> com.sun.imageio.plugins.png.PNGImageReader#readImage at 1253 has
>> thrown an IOException from decodeImage().
>>
>>

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Re: Problem with DecorationOverlayIcon [message #134727 is a reply to message #134714]

Tue, 02 June 2009 11:44

Dmitry Pryadkin

Messages: 146
Registered: July 2009

Senior Member

Rüdiger,

The point is that it was not me who generated this image. It was
composed by DecorationOverlayIcon from the parts.

Rüdiger Herrmann wrote:
> The image itself seems to cause the problem. Reading it directly also
> results in an exception:
> InputStream inputStream = new FileInputStream( "c:\\imgage.png" );
> ImageIO.read( inputStream );
> raises the same exception as your code.
> Some image-viewing-progreams also refuse to show the image.
>
> Dmitry Pryadkin wrote:
>> I've been reading comments by Frank Appel in
>> ResourceFactory#createImage. The following testcase shows that the
>> approach is erroneous.
>>
>> The img.png is the one I attached to my referenced message.
>>
>> try
>> {
>> InputStream inputStream = new FileInputStream("c:\\img.png");
>> BufferedInputStream bis = new BufferedInputStream( inputStream );
>>
>> try
>> {
>> ImageIO.setUseCache( false );
>> BufferedImage buf = ImageIO.read(bis);
>> }
>> catch (IOException e)
>> {
>> e.printStackTrace();
>> }
>> }
>> catch (FileNotFoundException e)
>> {
>> e.printStackTrace();
>> }
>>
>> Dmitry Pryadkin wrote:
>>> Hello everybody,
>>>
>>> Recently I've experienced a strange problem. I have a TableViewer
>>> with decorated icons in its items.
>>>
>>> At some point I call ColumnViewer#refresh to update decorations.
>>>
>>> I'm receiving com.sun.imageio.plugins.png.PNGImageReader exception.
>>> Stack trace is provided along with the png image.
>>>
>>> com.sun.imageio.plugins.png.PNGImageReader#readImage at 1253 has
>>> thrown an IOException from decodeImage().
>>>
>>>

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Re: Problem with DecorationOverlayIcon [message #134740 is a reply to message #134727]

Tue, 02 June 2009 12:27

Markus rüger

Messages: 369
Registered: July 2009

Senior Member

Hi,
we experienced the same problem a few weeks ago. The problem was, that one
of the images (the icon itself, or the icon to overlay with) had a
transparent area. Some image software, like photoshop, can save the image in
a way it can not be read properly (transperency set to "on" and no
background color). To fix this in photoshop for example you can save for
web, than activate the checkbox for transperency, if not already activate,
and set background to be "white". This solved our problem.

Hope that helps.

Regards,
Markus

"Dmitry Pryadkin" <drpadawan@ya.ru> schrieb im Newsbeitrag
news:h033a5$brs$1@build.eclipse.org...
> R

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Re: Problem with DecorationOverlayIcon [message #134829 is a reply to message #134740]

Wed, 03 June 2009 12:39

Dmitry Pryadkin

Messages: 146
Registered: July 2009

Senior Member

Thanks, I'll check this out

Markus Krüger wrote:
> Hi,
> we experienced the same problem a few weeks ago. The problem was, that one
> of the images (the icon itself, or the icon to overlay with) had a
> transparent area. Some image software, like photoshop, can save the image in
> a way it can not be read properly (transperency set to "on" and no
> background color). To fix this in photoshop for example you can save for
> web, than activate the checkbox for transperency, if not already activate,
> and set background to be "white". This solved our problem.

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