// ---------------------------------------------------------------------------
// Cropper function call operator
// ---------------------------------------------------------------------------
// Trim a Partial by removing Breakpoints outside a specified time span.
// Insert a Breakpoint at the boundary when cropping occurs.
//
void
Cropper::operator()( Partial & p ) const
{
// crop beginning of Partial
Partial::iterator it = p.findAfter( minTime );
if ( it != p.begin() ) // Partial begins earlier than minTime
{
if ( it != p.end() ) // Partial ends later than minTime
{
Breakpoint bp = p.parametersAt( minTime );
it = p.insert( minTime, bp );
}
it = p.erase( p.begin(), it );
}
// crop end of Partial
it = p.findAfter( maxTime );
if ( it != p.end() ) // Partial ends later than maxTime
{
if ( it != p.begin() ) // Partial begins earlier than maxTime
{
Breakpoint bp = p.parametersAt( maxTime );
it = p.insert( maxTime, bp );
++it; // advance, we don't want to cut this one off
}
it = p.erase( it, p.end() );
}
}
// ---------------------------------------------------------------------------
// merge (STATIC)
// ---------------------------------------------------------------------------
// Merge the Breakpoints in the specified iterator range into the
// distilled Partial. The beginning of the range may overlap, and
// will replace, some non-zero-amplitude portion of the distilled
// Partial. Assume that there is no such overlap at the end of the
// range (could check), because findContribution only leaves overlap
// at the beginning of the range.
//
static void merge( Partial::const_iterator beg,
Partial::const_iterator end,
Partial & destPartial, double fadeTime,
double gapTime = 0. )
{
// absorb energy in distilled Partial that overlaps the
// range to merge:
Partial toMerge( beg, end );
toMerge.absorb( destPartial );
fadeInAndOut( toMerge, fadeTime );
// find the first Breakpoint in destPartial that is after the
// range of merged Breakpoints, plus the required gap:
Partial::iterator removeEnd = destPartial.findAfter( toMerge.endTime() + gapTime );
// if this Breakpoint has non-zero amplitude, need to leave time
// for a fade in:
while ( removeEnd != destPartial.end() &&
removeEnd.breakpoint().amplitude() != 0 &&
removeEnd.time() < toMerge.endTime() + gapTime + fadeTime )
{
++removeEnd;
}
// find the first Breakpoint in the destination Partial that needs
// to be removed because it is in the overlap region:
Partial::iterator removeBegin = destPartial.findAfter( toMerge.startTime() - gapTime );
// if beforeMerge has non-zero amplitude, need to leave time
// for a fade out:
if ( removeBegin != destPartial.begin() )
{
Partial::iterator beforeMerge = --Partial::iterator(removeBegin);
while ( removeBegin != destPartial.begin() &&
beforeMerge.breakpoint().amplitude() != 0 &&
beforeMerge.time() > toMerge.startTime() - gapTime - fadeTime )
{
--removeBegin;
if ( beforeMerge != destPartial.begin() )
{
--beforeMerge;
}
}
}
// remove the Breakpoints in the merge range from destPartial:
double rbt = (removeBegin != destPartial.end())?(removeBegin.time()):(destPartial.endTime());
double ret = (removeEnd != destPartial.end())?(removeEnd.time()):(destPartial.endTime());
Assert( rbt <= ret );
destPartial.erase( removeBegin, removeEnd );
// how about doing the fades here instead?
// fade in if necessary:
if ( removeEnd != destPartial.end() &&
removeEnd.breakpoint().amplitude() != 0 )
{
Assert( removeEnd.time() - fadeTime > toMerge.endTime() );
// update removeEnd so that we don't remove this
// null we are inserting:
destPartial.insert(
removeEnd.time() - fadeTime,
BreakpointUtils::makeNullBefore( removeEnd.breakpoint(), fadeTime ) );
}
if ( removeEnd != destPartial.begin() )
{
Partial::iterator beforeMerge = --Partial::iterator(removeEnd);
if ( beforeMerge.breakpoint().amplitude() > 0 )
{
Assert( beforeMerge.time() + fadeTime < toMerge.startTime() );
destPartial.insert(
beforeMerge.time() + fadeTime,
BreakpointUtils::makeNullAfter( beforeMerge.breakpoint(), fadeTime ) );
}
}
// insert the Breakpoints in the range:
for ( Partial::const_iterator insert = toMerge.begin(); insert != toMerge.end(); ++insert )
{
destPartial.insert( insert.time(), insert.breakpoint() );
}
}