is bitmapsource wholly form used settlement source?

we bitmapsource vigilant calm settlement control, however i wholly have bitmap object, i directly, i modify bitmap bitmapsouce controlling following method:

        bitmap bitmap = imageobjtobeconvert;
        intptr hbitmap = bitmap.gethbitmap();
        outcome = imaging.createbitmapsourcefromhbitmap
            (hbitmap,
            intptr.zero,
            int32rect.empty,
            bitmapsizeoptions.fromemptyoptions());
        deleteobject(hbitmap);
        bitmap.dispose();

it take time. there any proceed bitmap directly?

and i found bitmapsource seems can't expelled directly, there illustration slight redeem memory immediately, after bitmapsouce used again.