JUCE/modules/juce_audio_basics/mpe/juce_MPEZone.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE 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 more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

  ==============================================================================
*/

namespace
{
    void checkAndLimitZoneParameters (int minValue,
                                      int maxValue,
                                      int& valueToCheckAndLimit) noexcept
    {
        if (valueToCheckAndLimit < minValue || valueToCheckAndLimit > maxValue)
        {
            // if you hit this, one of the parameters you supplied for MPEZone
            // was not within the allowed range!
            // we fit this back into the allowed range here to maintain a valid
            // state for the zone, but probably the resulting zone is not what you
            //wanted it to be!
            jassertfalse;

            valueToCheckAndLimit = jlimit (minValue, maxValue, valueToCheckAndLimit);
        }
    }
}

//==============================================================================
MPEZone::MPEZone (int masterChannel_,
                  int numNoteChannels_,
                  int perNotePitchbendRange_,
                  int masterPitchbendRange_) noexcept
    : masterChannel (masterChannel_),
      numNoteChannels (numNoteChannels_),
      perNotePitchbendRange (perNotePitchbendRange_),
      masterPitchbendRange (masterPitchbendRange_)
{
    checkAndLimitZoneParameters (1, 15,                  masterChannel);
    checkAndLimitZoneParameters (1, 16 - masterChannel,  numNoteChannels);
    checkAndLimitZoneParameters (0, 96,                  perNotePitchbendRange);
    checkAndLimitZoneParameters (0, 96,                  masterPitchbendRange);
}

//==============================================================================
int MPEZone::getMasterChannel() const noexcept
{
    return masterChannel;
}

int MPEZone::getNumNoteChannels() const noexcept
{
    return numNoteChannels;
}

int MPEZone::getFirstNoteChannel() const noexcept
{
    return masterChannel + 1;
}

int MPEZone::getLastNoteChannel() const noexcept
{
    return masterChannel + numNoteChannels;
}

Range<int> MPEZone::getNoteChannelRange() const noexcept
{
    return Range<int>::withStartAndLength (getFirstNoteChannel(), getNumNoteChannels());
}

bool MPEZone::isUsingChannel (int channel) const noexcept
{
    jassert (channel > 0 && channel <= 16);
    return channel >= masterChannel && channel <= masterChannel + numNoteChannels;
}

bool MPEZone::isUsingChannelAsNoteChannel (int channel) const noexcept
{
    jassert (channel > 0 && channel <= 16);
    return channel > masterChannel && channel <= masterChannel + numNoteChannels;
}

int MPEZone::getPerNotePitchbendRange() const noexcept
{
    return perNotePitchbendRange;
}

int MPEZone::getMasterPitchbendRange() const noexcept
{
    return masterPitchbendRange;
}

void MPEZone::setPerNotePitchbendRange (int rangeInSemitones) noexcept
{
    checkAndLimitZoneParameters (0, 96, rangeInSemitones);
    perNotePitchbendRange = rangeInSemitones;
}

void MPEZone::setMasterPitchbendRange (int rangeInSemitones) noexcept
{
    checkAndLimitZoneParameters (0, 96, rangeInSemitones);
    masterPitchbendRange = rangeInSemitones;
}

//==============================================================================
bool MPEZone::overlapsWith (MPEZone other) const noexcept
{
    if (masterChannel == other.masterChannel)
        return true;

    if (masterChannel > other.masterChannel)
        return other.overlapsWith (*this);

    return masterChannel + numNoteChannels >= other.masterChannel;
}

//==============================================================================
bool MPEZone::truncateToFit (MPEZone other) noexcept
{
    const int masterChannelDiff = other.masterChannel - masterChannel;

    // we need at least 2 channels to be left after truncation:
    // 1 master channel and 1 note channel. otherwise we can't truncate.
    if (masterChannelDiff < 2)
        return false;

    numNoteChannels = jmin (numNoteChannels, masterChannelDiff - 1);
    return true;
}

//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

class MPEZoneTests   : public UnitTest
{
public:
    MPEZoneTests()  : UnitTest ("MPEZone class") {}

    void runTest() override
    {
        beginTest ("initialisation");
        {
            {
                MPEZone zone (1, 10);

                expectEquals (zone.getMasterChannel(), 1);
                expectEquals (zone.getNumNoteChannels(), 10);
                expectEquals (zone.getFirstNoteChannel(), 2);
                expectEquals (zone.getLastNoteChannel(), 11);
                expectEquals (zone.getPerNotePitchbendRange(), 48);
                expectEquals (zone.getMasterPitchbendRange(), 2);

                expect (zone.isUsingChannel (1));
                expect (zone.isUsingChannel (2));
                expect (zone.isUsingChannel (10));
                expect (zone.isUsingChannel (11));
                expect (! zone.isUsingChannel (12));
                expect (! zone.isUsingChannel (16));

                expect (! zone.isUsingChannelAsNoteChannel (1));
                expect (zone.isUsingChannelAsNoteChannel (2));
                expect (zone.isUsingChannelAsNoteChannel (10));
                expect (zone.isUsingChannelAsNoteChannel (11));
                expect (! zone.isUsingChannelAsNoteChannel (12));
                expect (! zone.isUsingChannelAsNoteChannel (16));
            }
            {
                MPEZone zone (5, 4);

                expectEquals (zone.getMasterChannel(), 5);
                expectEquals (zone.getNumNoteChannels(), 4);
                expectEquals (zone.getFirstNoteChannel(), 6);
                expectEquals (zone.getLastNoteChannel(), 9);
                expectEquals (zone.getPerNotePitchbendRange(), 48);
                expectEquals (zone.getMasterPitchbendRange(), 2);

                expect (! zone.isUsingChannel (1));
                expect (! zone.isUsingChannel (4));
                expect (zone.isUsingChannel (5));
                expect (zone.isUsingChannel (6));
                expect (zone.isUsingChannel (8));
                expect (zone.isUsingChannel (9));
                expect (! zone.isUsingChannel (10));
                expect (! zone.isUsingChannel (16));

                expect (! zone.isUsingChannelAsNoteChannel (5));
                expect (zone.isUsingChannelAsNoteChannel (6));
                expect (zone.isUsingChannelAsNoteChannel (8));
                expect (zone.isUsingChannelAsNoteChannel (9));
                expect (! zone.isUsingChannelAsNoteChannel (10));
            }

        }

        beginTest ("getNoteChannelRange");
        {
            MPEZone zone (2, 10);

            Range<int> noteChannelRange = zone.getNoteChannelRange();
            expectEquals (noteChannelRange.getStart(), 3);
            expectEquals (noteChannelRange.getEnd(), 13);
        }

        beginTest ("setting master pitchbend range");
        {
            MPEZone zone (1, 10);

            zone.setMasterPitchbendRange (96);
            expectEquals (zone.getMasterPitchbendRange(), 96);
            zone.setMasterPitchbendRange (0);
            expectEquals (zone.getMasterPitchbendRange(), 0);

            expectEquals (zone.getPerNotePitchbendRange(), 48);
        }

        beginTest ("setting per-note pitchbend range");
        {
            MPEZone zone (1, 10);

            zone.setPerNotePitchbendRange (96);
            expectEquals (zone.getPerNotePitchbendRange(), 96);
            zone.setPerNotePitchbendRange (0);
            expectEquals (zone.getPerNotePitchbendRange(), 0);

            expectEquals (zone.getMasterPitchbendRange(), 2);
        }

        beginTest ("checking overlap");
        {
            testOverlapsWith (1, 10, 1, 10, true);
            testOverlapsWith (1, 4,  6, 3,  false);
            testOverlapsWith (1, 4,  8, 3,  false);
            testOverlapsWith (2, 10, 2, 8,  true);
            testOverlapsWith (1, 10, 3, 2,  true);
            testOverlapsWith (3, 10, 5, 9,  true);
        }

        beginTest ("truncating");
        {
            testTruncateToFit (1, 10, 3, 10, true,  1, 1);
            testTruncateToFit (3, 10, 1, 10, false, 3, 10);
            testTruncateToFit (1, 10, 5, 8,  true,  1, 3);
            testTruncateToFit (5, 8,  1, 10, false, 5, 8);
            testTruncateToFit (1, 10, 4, 3,  true,  1, 2);
            testTruncateToFit (4, 3,  1, 10, false, 4, 3);
            testTruncateToFit (1, 3,  5, 3,  true,  1, 3);
            testTruncateToFit (5, 3,  1, 3,  false, 5, 3);
            testTruncateToFit (1, 3,  7, 3,  true,  1, 3);
            testTruncateToFit (7, 3,  1, 3,  false, 7, 3);
            testTruncateToFit (1, 10, 2, 10, false, 1, 10);
            testTruncateToFit (2, 10, 1, 10, false, 2, 10);
        }
    }

private:
    //==========================================================================
    void testOverlapsWith (int masterChannelFirst, int numNoteChannelsFirst,
                           int masterChannelSecond, int numNoteChannelsSecond,
                           bool expectedRetVal)
    {
        MPEZone first (masterChannelFirst, numNoteChannelsFirst);
        MPEZone second (masterChannelSecond, numNoteChannelsSecond);

        expect (first.overlapsWith (second) == expectedRetVal);
        expect (second.overlapsWith (first) == expectedRetVal);
    }

    //==========================================================================
    void testTruncateToFit (int masterChannelFirst, int numNoteChannelsFirst,
                            int masterChannelSecond, int numNoteChannelsSecond,
                            bool expectedRetVal,
                            int masterChannelFirstAfter, int numNoteChannelsFirstAfter)
    {
        MPEZone first (masterChannelFirst, numNoteChannelsFirst);
        MPEZone second (masterChannelSecond, numNoteChannelsSecond);

        expect (first.truncateToFit (second) == expectedRetVal);
        expectEquals (first.getMasterChannel(), masterChannelFirstAfter);
        expectEquals (first.getNumNoteChannels(), numNoteChannelsFirstAfter);
    }
};

static MPEZoneTests MPEZoneUnitTests;

#endif // JUCE_UNIT_TESTS