/* union a segment into the set */
public static void SkipSegmentsAdd(
SkipSegmentsRec Segments,
double dStart,
double dDuration)
{
#if DEBUG
if (dDuration < 0)
{
Debug.Assert(false);
throw new ArgumentException();
}
#endif
if (dDuration <= 0)
{
return;
}
IntervalRec Interval = new IntervalRec();
Interval.Next = Segments.List;
Segments.List = Interval;
Interval.dStart = dStart;
Interval.dDuration = dDuration;
#if DEBUG
ValidateSkipSegments(Segments);
#endif
}
private static void ValidateSkipSegments(SkipSegmentsRec Segments)
{
IntervalRec Interval = Segments.List;
while (Interval != null)
{
if (Interval.dDuration <= 0)
{
// found expired interval
Debug.Assert(false);
throw new InvalidOperationException();
}
Interval = Interval.Next;
}
}
/* increment the position counter. returns True if current cycle should */
/* be skipped (according to the segment list) */
public static bool SkipSegmentUpdateOneCycle(
SkipSegmentsRec Segments,
double dEnvelopeTicks,
double dDurationTicks)
{
bool CurrentlyInSegment = false;
#if DEBUG
ValidateSkipSegments(Segments);
#endif
IntervalRec IntervalTrailer = null;
IntervalRec Interval = Segments.List;
while (Interval != null)
{
/* decrement current intervals to expiration */
if (Interval.dStart <= Segments.dElapsedEnvelopeTicks)
{
CurrentlyInSegment = true;
Interval.dDuration -= dDurationTicks;
if (Interval.dDuration <= 0)
{
if (IntervalTrailer == null)
{
Segments.List = Interval.Next;
}
else
{
IntervalTrailer.Next = Interval.Next;
}
Interval = Interval.Next;
continue;
}
}
IntervalTrailer = Interval;
Interval = Interval.Next;
}
Segments.dElapsedEnvelopeTicks += dEnvelopeTicks;
#if DEBUG
ValidateSkipSegments(Segments);
#endif
return(CurrentlyInSegment);
}
/* create a new skip segments list */
public static SkipSegmentsRec NewSkipSegments()
{
SkipSegmentsRec Segments = new SkipSegmentsRec();
return(Segments);
}