Add SEL_OFF, SELBYDEST() (like SELECTED but for SEL_DEST SelOp's).

src/specks.h

@@ -126,6 +126,7 @@ typedef struct _selfunc {
    *    (attributes ^ wanton) & (wanton | wantoff) == 0
    */
 #define	SELECTED(attrs, selp)	(0==( ((attrs)^(selp)->wanton) & (selp)->wanted))
+#define	SELBYDEST(attrs, selp)  (0==( ((attrs)^(selp)->wanton) & ~(selp)->wanted))
 #define	SELSET(attrs, selp)	((attrs) = ((attrs)&(selp)->wanted) ^ (selp)->wanton)
 #define SELUNSET(attrs, selp)	(((attrs) = ((attrs)&~(selp)->wanton)) | ~(selp)->wanted)
 
@@ -309,6 +310,7 @@ struct stuff {
   int threshvar;		/* datavar index to threshold on */
   float thresh[2];		/* data range */
   int threshseq;
+#define	SEL_OFF	   34
 #define SEL_ALL	   33
 #define SEL_THRESH 32
 #define SEL_PICK   31		/*XXX shouldn't be hard-wired!*/
@@ -316,6 +318,7 @@ struct stuff {
   int useemph;
   SelOp emphsel;
   float emphfactor;		/* increase lum by this factor */
+  int selcount;			/* temp variable, counts numbers of chosen ones */
 
 
 #define MAXSEL 30