On Wed, 27 Dec 2017, Alexandre Prokoudine wrote: > On Thu, Dec 28, 2017 at 1:42 AM Boudewijn Rempt wrote: > > > > > This, actually, is also how Photoshop works: one Krita developer spoke to > > a Photoshop developer during a recent conference and picked his brain... > > Photoshop makes a copy of the image for _every_ state. Any undo state is a > > shallow copy of the document. > > > Even for gigapixel panoramas? > That's what they told us. The number of pixels shouldn't matter, since these are shallow copies -- only when a tile is changed, the actual pixel data gets copied. That reminds me -- I don't know how Gimp handles its tiles (or scanlines) but krita has got a huge and very complicated pool and hash tables to store tiles. In photoshop, tiles are large and stored in a plain std::vector. -- Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
