* Daniel Rogers <daniel@xxxxxxxxxxxxxxxxx> [040923 19:20]: > On Sep 22, 2004, at 10:53 AM, Øyvind Kolås wrote: > >On 09/21/04 23:17:28, Øyvind Kolås wrote: > >The approach [single root, ROI] doesn't easily facilitate multiplie > >active sinks at the > >same time, something that might be beneficial for rendering thumbnails > >in the composition treeview in GIMP. The approach needed with the > >current evaluation manager is to issue a seperate processing step for > >each thumbnail that one wants to generate. > > This isn't a limitation of the "ROI" processing concept. Ideally the > results from any particular processing is caching, and only > recalculated if something changes, the cache gets full, or it is faster > to recalculate than draw from the cache. In which case, the second, > thumbnail calculation doesn't take much extra time, since it can reuse > the results of the first, Original calculation. This is not orthogonal to the gggl approach of setting "active nodes" (which essentially is multiple root nodes). The caching approach though makes it harder to redefine root nodes, as well as collapsing affine transforms,.. unless the caching is done on a composition graph can take multiple roots into accounts when doing collapsing of affine transforms. /pippin
