Thumbnail decoration of Image file-types

[Peter Penz]

On Friday 21 May 2010 18:10:35 Harsh J wrote:
> Hello devs!
> 
> Could I know how the Image type thumbnail plugin handles the
> generation with effects ( as seen in this screenshot:
> http://img17.imageshack.us/img17/144/whyt.png ) as opposed to the
> thumbnails created by PDF/ComicBook/Etc plugins?

This is done currently in KFilePreviewGenerator 
(kdelibs/kfile/kfilepreviewgenerator.*) in the method 
KFilePreviewGenerator::Private::applyImageFrame().

Currently this is hardcoded by checking whether the mimetype group is "image". 
This of course could be improved to be more generic (or probably moved to the 
thumbcreators completely), but this has not been requested until now :-)
 
> The image thumbnails always had these decorative shadow around them,
> just like icons in the non-preview-enabled file view have. I've tried,
> under ThumbCreator, the 'None' and the 'DrawFrame' flags but both
> hardly bring out something even close to such an effect.
> 
> Looking into the kioslave/thumbnail/ directory for image plugins
> didn't return results, or I maybe could not figure out what 'special'
> post-processing they're invoking after generating the thumbnail. How
> is this being achieved?
> 
> If is this a image-specific view feature, where may I find the handler
> code?