[KPhotoAlbum] image decoding priorities & multithreading

[Jan Kundrát]

After yesterday's patch that enables KPA to use multiple CPU cores for 
decoding images, this patch improves general responsibility by replacing 
older "priority/regular" system with more priority levels. Right now, we 
have defined the following, in ascending order (ie. the first one has 
the lowest priority):

1) Requests generated through the "Rebuild Thumbnails" command
2) Thumbnails in current search scope, but invisible
3) Image that will be probably displayed later in the viewer
4) Requests like resizing images for HTML pages (explicitely requested 
by users)
5) Thumbnail visible on screen right now (might get invalidated later)
6) Image is visible in the viewer right now

This patch isn't complete yet (the "Regenerate thumbnails" got to be 
ported if we want to gain something from SMP) and thread priorities 
needs to be solved, but I'm posting the patch for review anyway, as the 
changes to ImageManager/ImageDecoder/... are complete, AFAIK.

Cheers,
-jkt

-- 
cd /local/pub && more beer > /dev/mouth

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
URL: <http://mail.kde.org/pipermail/kphotoalbum/attachments/20080623/26c46cf0/attachment.sig>