Thinking off the top of my head, you could make a histogram call to the selection "channel" at 255 (fully selected) and see if the returned pixel count equals the number of pixels (width x height). On 10/9/10, Ofnuts <ofnuts@xxxxxxxxxxx> wrote: > On 10/10/2010 00:22, David Gowers (kampu) wrote: >> On Sun, Oct 10, 2010 at 7:47 AM, Ofnuts<ofnuts@xxxxxxxxxxx> wrote: >>> Assume I have a selection on small area (for instance a 20px circle), >>> and I invert it. Now, if I grow the selection by a sufficient amount >>> (10px in this case), everything gets selected. >>> >>> Is there a practical, fast way, to detect this case, i.e, that the >>> selection covers the whole layer (or image?) and that no pixels remain >>> unselected? I assume that inverting the selection again and testing for >>> empty would work, but that would be two selection inversions in the >>> normal case and that may be a bit costly. >> Testing for empty and for full are the same operation (an empty sel is >> equivalent to a full one) >> >> HTH >> > > There are indeed many tools that behave the same way if the selection is > empty of complete, but gimp_selection_is_empty > <http://developer.gimp.org/api/2.0/libgimp/libgimp-gimpselection.html#gimp-selection-is-empty>() > return False when the selection is complete, alas. > > > -- > Bertrand > > _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
