I think I posted about this about 4 or 5 months ago and I think someone applied a patch, but it seems this bug is back.
When 1 bitmap which is say 24bit, is assigned to another bitmap which is say 32bit, the second bitmap seems to preserve its 32bitness, when it should not, because an assign has taken place.
The following example illustrates the issue...
var
thebitmap : TBitmap;
undoimg : TBitmap;
begin
thebitmap := TBitmap.Create;
thebitmap.PixelFormat := pf24bit; // definitely 24bit
undoimg := TBitmap.Create; // default bit depth
undoimg.Assign(thebitmap);
//undoimg is now not 24bit! it is whatever the default is when a new
Bitmap is constructed.
end;I can submit this as another bug report, if necessary.
This was tested in Mac OS X 10.5.8, using Lazarus revision 22631.
Thanks,
Dominique.