287 lines
7.5 KiB
C++
287 lines
7.5 KiB
C++
/* This file is part of Evoral.
|
|
* Copyright (C) 2008 David Robillard <http://drobilla.net>
|
|
* Copyright (C) 2000-2008 Paul Davis
|
|
*
|
|
* Evoral is free software; you can redistribute it and/or modify it under the
|
|
* terms of the GNU General Public License as published by the Free Software
|
|
* Foundation; either version 2 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef EVORAL_RANGE_HPP
|
|
#define EVORAL_RANGE_HPP
|
|
|
|
#include <list>
|
|
#include <assert.h>
|
|
#include <iostream>
|
|
#include "evoral/visibility.h"
|
|
|
|
|
|
|
|
namespace Evoral {
|
|
|
|
enum /*LIBEVORAL_API*/ OverlapType {
|
|
OverlapNone, // no overlap
|
|
OverlapInternal, // the overlap is 100% within the object
|
|
OverlapStart, // overlap covers start, but ends within
|
|
OverlapEnd, // overlap begins within and covers end
|
|
OverlapExternal // overlap extends to (at least) begin+end
|
|
};
|
|
|
|
template<typename T>
|
|
/*LIBEVORAL_API*/ OverlapType coverage (T sa, T ea, T sb, T eb) {
|
|
/* OverlapType returned reflects how the second (B)
|
|
* range overlaps the first (A).
|
|
*
|
|
* The diagram shows the OverlapType of each possible relative
|
|
* placement of A and B.
|
|
*
|
|
* Notes:
|
|
* Internal: the start and end points cannot coincide
|
|
* External: the start and end points can coincide
|
|
* Start: end points can coincide
|
|
* End: start points can coincide
|
|
*
|
|
* Internal disallows start and end point equality, and thus implies
|
|
* that there are two disjoint portions of A which do not overlap B.
|
|
*
|
|
* A: |---|
|
|
* B starts before A
|
|
* B: |-| None
|
|
* B: |--| Start
|
|
* B: |----| Start
|
|
* B: |------| External
|
|
* B: |--------| External
|
|
* B starts equal to A
|
|
* B: |-| Start
|
|
* B: |---| External
|
|
* B: |----| External
|
|
* B starts inside A
|
|
* B: |-| Internal
|
|
* B: |--| End
|
|
* B: |---| End
|
|
* B starts at end of A
|
|
* B: |--| End
|
|
* B starts after A
|
|
* B: |-| None
|
|
* A: |---|
|
|
*/
|
|
|
|
|
|
if (sa > ea) {
|
|
// seems we are sometimes called with negative length ranges
|
|
std::cerr << "a - start after end: " << sa << ", " << ea << std::endl;
|
|
return OverlapNone;
|
|
}
|
|
|
|
if (sb > eb) {
|
|
// seems we are sometimes called with negative length ranges
|
|
std::cerr << "b - start after end: " << sb << ", " << eb << std::endl;
|
|
return OverlapNone;
|
|
}
|
|
|
|
if (sb < sa) { // B starts before A
|
|
if (eb < sa) {
|
|
return OverlapNone;
|
|
} else if (eb == sa) {
|
|
return OverlapStart;
|
|
} else { // eb > sa
|
|
if (eb < ea) {
|
|
return OverlapStart;
|
|
} else if (eb == ea) {
|
|
return OverlapExternal;
|
|
} else {
|
|
return OverlapExternal;
|
|
}
|
|
}
|
|
} else if (sb == sa) { // B starts equal to A
|
|
if (eb < ea) {
|
|
return OverlapStart;
|
|
} else if (eb == ea) {
|
|
return OverlapExternal;
|
|
} else { // eb > ea
|
|
return OverlapExternal;
|
|
}
|
|
} else { // sb > sa
|
|
if (eb < ea) {
|
|
return OverlapInternal;
|
|
} else if (eb == ea) {
|
|
return OverlapEnd;
|
|
} else { // eb > ea
|
|
if (sb < ea) { // B starts inside A
|
|
return OverlapEnd;
|
|
} else if (sb == ea) { // B starts at end of A
|
|
return OverlapEnd;
|
|
} else { // sb > ea, B starts after A
|
|
return OverlapNone;
|
|
}
|
|
}
|
|
}
|
|
|
|
std::cerr << "unknown overlap type!" << sa << ", " << ea << "; " << sb << ", " << eb << std::endl;
|
|
assert(!"unknown overlap type!");
|
|
return OverlapNone;
|
|
}
|
|
|
|
/** Type to describe a time range */
|
|
template<typename T>
|
|
struct /*LIBEVORAL_API*/ Range {
|
|
Range (T f, T t) : from (f), to (t) {}
|
|
T from; ///< start of the range
|
|
T to; ///< end of the range (inclusive: to lies inside the range)
|
|
bool empty() const { return from == to; }
|
|
};
|
|
|
|
template<typename T>
|
|
bool operator== (Range<T> a, Range<T> b) {
|
|
return a.from == b.from && a.to == b.to;
|
|
}
|
|
|
|
template<typename T>
|
|
class /*LIBEVORAL_API*/ RangeList {
|
|
public:
|
|
RangeList () : _dirty (false) {}
|
|
|
|
typedef std::list<Range<T> > List;
|
|
|
|
List const & get () {
|
|
coalesce ();
|
|
return _list;
|
|
}
|
|
|
|
void add (Range<T> const & range) {
|
|
_dirty = true;
|
|
_list.push_back (range);
|
|
}
|
|
|
|
bool empty () const {
|
|
return _list.empty ();
|
|
}
|
|
|
|
void coalesce () {
|
|
if (!_dirty) {
|
|
return;
|
|
}
|
|
|
|
restart:
|
|
for (typename List::iterator i = _list.begin(); i != _list.end(); ++i) {
|
|
for (typename List::iterator j = _list.begin(); j != _list.end(); ++j) {
|
|
|
|
if (i == j) {
|
|
continue;
|
|
}
|
|
|
|
if (coverage (i->from, i->to, j->from, j->to) != OverlapNone) {
|
|
i->from = std::min (i->from, j->from);
|
|
i->to = std::max (i->to, j->to);
|
|
_list.erase (j);
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
|
|
_dirty = false;
|
|
}
|
|
|
|
private:
|
|
|
|
List _list;
|
|
bool _dirty;
|
|
};
|
|
|
|
/** Type to describe the movement of a time range */
|
|
template<typename T>
|
|
struct /*LIBEVORAL_API*/ RangeMove {
|
|
RangeMove (T f, double l, T t) : from (f), length (l), to (t) {}
|
|
T from; ///< start of the range
|
|
double length; ///< length of the range
|
|
T to; ///< new start of the range
|
|
};
|
|
|
|
/** Subtract the ranges in `sub' from that in `range',
|
|
* returning the result.
|
|
*/
|
|
template<typename T>
|
|
RangeList<T> subtract (Range<T> range, RangeList<T> sub)
|
|
{
|
|
/* Start with the input range */
|
|
RangeList<T> result;
|
|
result.add (range);
|
|
|
|
if (sub.empty () || range.empty()) {
|
|
return result;
|
|
}
|
|
|
|
typename RangeList<T>::List s = sub.get ();
|
|
|
|
/* The basic idea here is to keep a list of the result ranges, and subtract
|
|
the bits of `sub' from them one by one.
|
|
*/
|
|
|
|
for (typename RangeList<T>::List::const_iterator i = s.begin(); i != s.end(); ++i) {
|
|
|
|
/* Here's where we'll put the new current result after subtracting *i from it */
|
|
RangeList<T> new_result;
|
|
|
|
typename RangeList<T>::List r = result.get ();
|
|
|
|
/* Work on all parts of the current result using this range *i */
|
|
for (typename RangeList<T>::List::const_iterator j = r.begin(); j != r.end(); ++j) {
|
|
|
|
switch (coverage (j->from, j->to, i->from, i->to)) {
|
|
case OverlapNone:
|
|
/* The thing we're subtracting (*i) does not overlap this bit of the result (*j),
|
|
so pass it through.
|
|
*/
|
|
new_result.add (*j);
|
|
break;
|
|
case OverlapInternal:
|
|
/* Internal overlap of the thing we're subtracting (*i) from this bit of the result,
|
|
so we should end up with two bits of (*j) left over, from the start of (*j) to
|
|
the start of (*i), and from the end of (*i) to the end of (*j).
|
|
*/
|
|
assert (j->from < i->from);
|
|
assert (j->to > i->to);
|
|
new_result.add (Range<T> (j->from, i->from - 1));
|
|
new_result.add (Range<T> (i->to + 1, j->to));
|
|
break;
|
|
case OverlapStart:
|
|
/* The bit we're subtracting (*i) overlaps the start of the bit of the result (*j),
|
|
* so we keep only the part of of (*j) from after the end of (*i)
|
|
*/
|
|
assert (i->to < j->to);
|
|
new_result.add (Range<T> (i->to + 1, j->to));
|
|
break;
|
|
case OverlapEnd:
|
|
/* The bit we're subtracting (*i) overlaps the end of the bit of the result (*j),
|
|
* so we keep only the part of of (*j) from before the start of (*i)
|
|
*/
|
|
assert (j->from < i->from);
|
|
new_result.add (Range<T> (j->from, i->from - 1));
|
|
break;
|
|
case OverlapExternal:
|
|
/* total overlap of the bit we're subtracting with the result bit, so the
|
|
result bit is completely removed; do nothing */
|
|
break;
|
|
}
|
|
}
|
|
|
|
new_result.coalesce ();
|
|
result = new_result;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|