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Off-screen drawing [message #104717]

Thu, 01 September 2005 17:30

Jonathan Edwards

Messages: 27
Registered: July 2009

Junior Member

Is there any way in SWT to create a Shell or Display that is off-screen,
so that standard SWT controls draw to memory instead of the screen? For
example to create thumbnails in a visual builder.

I was forwarded here from the SWT newsgroup with the hint that there are
platform-specific solutions.

Thanks,
Jonathan

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Re: Off-screen drawing [message #104736 is a reply to message #104717]

Thu, 01 September 2005 17:47

Eclipse User

Originally posted by: myersj.gmail.com

Hi Jonathan,

The Visual Editor uses this technique to grab images of SWT controls to
use within its design view. Unfortunately as you say, it requires
platform specific code.

Here's the code to do this on Windows:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.ve.swt/ vm_swt/org/eclipse/ve/internal/swt/targetvm/win32/ImageCaptu re.java?rev=1.11&cvsroot=Tools_Project&content-type= text/vnd.viewcvs-markup

And on GTK:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.ve.swt/ vm_swt/org/eclipse/ve/internal/swt/targetvm/unix/ImageCaptur e.java?rev=1.10&cvsroot=Tools_Project&content-type=t ext/vnd.viewcvs-markup

GTK requires the use of a native library to capture the image:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.ve.swt/ os/linux/x86/?cvsroot=Tools_Project

As of yet the VE does not have code to accomplish this on OS X.

Hope this helps,
- Jeff

Jonathan Edwards wrote:
> Is there any way in SWT to create a Shell or Display that is off-screen,
> so that standard SWT controls draw to memory instead of the screen? For
> example to create thumbnails in a visual builder.
>
> I was forwarded here from the SWT newsgroup with the hint that there are
> platform-specific solutions.
>
> Thanks,
> Jonathan

Report message to a moderator

Re: Off-screen drawing [message #610585 is a reply to message #104717]

Thu, 01 September 2005 17:47

Jeff Myers

Messages: 396
Registered: July 2009

Senior Member

Hi Jonathan,

The Visual Editor uses this technique to grab images of SWT controls to
use within its design view. Unfortunately as you say, it requires
platform specific code.

Here's the code to do this on Windows:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.ve.swt/ vm_swt/org/eclipse/ve/internal/swt/targetvm/win32/ImageCaptu re.java?rev=1.11&cvsroot=Tools_Project&content-type= text/vnd.viewcvs-markup

And on GTK:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.ve.swt/ vm_swt/org/eclipse/ve/internal/swt/targetvm/unix/ImageCaptur e.java?rev=1.10&cvsroot=Tools_Project&content-type=t ext/vnd.viewcvs-markup

GTK requires the use of a native library to capture the image:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.ve.swt/ os/linux/x86/?cvsroot=Tools_Project

As of yet the VE does not have code to accomplish this on OS X.

Hope this helps,
- Jeff

Jonathan Edwards wrote:
> Is there any way in SWT to create a Shell or Display that is off-screen,
> so that standard SWT controls draw to memory instead of the screen? For
> example to create thumbnails in a visual builder.
>
> I was forwarded here from the SWT newsgroup with the hint that there are
> platform-specific solutions.
>
> Thanks,
> Jonathan

Report message to a moderator

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