Add per-datavar colormaps.

Add emphasis controls.

src/specks.h

@@ -39,6 +39,8 @@ struct valdesc {
   enum Lop { L_LOG, L_EXP, L_POW } lop;
   float lbase, lexp;	/* L_LOG: log(v/lbase + lexp); L_EXP: pow(lexp, v/lbase); L_POW: pow(v/lbase, lexp) */
   char name[20];
+  struct cment *vcmap;	/* per-data-variable colormap (may be NULL); rgba format */
+  int vncmap;		/* number of entries in cmap */
 };
 
 struct cment {
@@ -219,6 +221,8 @@ struct stuff {
   float pfaint, plarge;		/* min/max point brightness */
   float polymin;		/* min size (pixels) to render polygons */
   float polymax;		/* max size (pixels) to render polygons */
+  float polyfademax;		/* if polymin < size < polyfademax, then fade */
+
   float psize;
   float polysize;
   float textmin;		/* min height (pixels) to render labels */
@@ -243,7 +247,7 @@ struct stuff {
   float fadeknee1, fadeknee2;	/* near and far distance knees in fade curve */
   float knee2steep;		/* steepness of far knee */
   Point fadecen;
-
+  
 #define P_THRESHMIN 0x1
 #define P_THRESHMAX 0x2
 #define P_USETHRESH 0x4
@@ -252,6 +256,11 @@ struct stuff {
   float thresh[2];		/* data range */
   int threshseq;
 
+  int useemph;
+  int emphvar;
+  float emphfactor;		/* increase lum by this factor (?) */
+  int emphseq;
+
   int inpick;
 
   float gscale;