DNA_ipo_types.h comments only

other are changes so calchandles_ipocurve only calc handels on a bezier line.
This makes bvh import faster but should also speed up internal IPO operations.

source/blender/blenkernel/intern/ipo.c

@@ -453,7 +453,9 @@ void calchandles_ipocurve(IpoCurve *icu)
 	int a;
 
 	a= icu->totvert;
-	if(a<2) return;
+	
+	/* IPO_CONST or IPO_LIN, dont have handels */
+	if(a<2 || icu->ipo==IPO_LIN || icu->ipo==IPO_CONST) return;
 	
 	bezt= icu->bezt;
 	prev= 0;

source/blender/makesdna/DNA_ipo_types.h

@@ -367,11 +367,11 @@ typedef short IPO_Channel;
 #define IPO_SHORT_BIT	17
 #define IPO_INT_BIT		18
 
-/* icu->ipo */
+/* icu->ipo:  the type of curve */
 #define IPO_CONST		0
 #define IPO_LIN			1
 #define IPO_BEZ			2
-#define IPO_MIXED		3
+#define IPO_MIXED		3 /* not used yet */
 
 /* icu->extrap */
 #define IPO_HORIZ		0

source/blender/src/editipo_mods.c

@@ -651,7 +651,13 @@ static void set_ipocurve_linear(struct IpoCurve *icu) {
 static void set_ipocurve_bezier(struct IpoCurve *icu) {
 	/* Sets the type of the IPO curve to bezier
 	 */
+	
+	/* dont regenerate hendels for bezier ipo curves */
+	if (icu->ipo==IPO_BEZ) return;
+	
+	/* curve handels aren't generated for non bezier curve types */
 	icu->ipo= IPO_BEZ;
+	calchandles_ipocurve(icu);
 }