source file of the GNU LilyPond music typesetter
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include <math.h>
-#include "item.hh"
#include "misc.hh"
-#include "moment.hh"
+/*
+ Return the 2-log, rounded down
+*/
int
-intlog2(int d) {
- int i=0;
- while (!(d&1)) {
- d/= 2;
- i++;
+intlog2 (int d)
+{
+ assert (d);
+ int i = 0;
+ while ((d != 1))
+ {
+ d /= 2;
+ i++;
}
- assert (!(d/2));
- return i;
+
+ assert (! (d / 2));
+ return i;
}
double
-log_2(double x) {
- return log (x) /log (2.0);
+log_2 (double x)
+{
+ return log (x) / log (2.0);
}
-#if 1
-Interval
-itemlist_width (const Array<Item*> &its)
+Real
+directed_round (Real f, Direction d)
{
- Interval iv ;
- iv.set_empty();
-
- for (int j =0; j < its.size(); j++){
- iv.unite (its[j]->width());
-
- }
- return iv;
+ if (d < 0)
+ return floor (f);
+ else
+ return ceil (f);
}
-#endif
+
+
+/*
+ 0 at threshold, 1 at 0, with 1/x falloff.
+ */
+Real
+peak_around (Real epsilon, Real threshold, Real x)
+{
+ if (x < 0)
+ return 1.0;
+ return max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
+}