SampleWaveDisplay.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * Copyright(c) 2008-2024 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * This program 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.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see https://www.gnu.org/licenses
 *
 */
 
#include <core/Basics/Sample.h>
#include <core/Basics/Song.h>
#include <core/Basics/Instrument.h>
using namespace H2Core;
 
#include "SampleWaveDisplay.h"
#include "../Skin.h"
 
SampleWaveDisplay::SampleWaveDisplay(QWidget* pParent)
 : QWidget( pParent )
 , m_sSampleName( "" )
{
//      setAttribute(Qt::WA_OpaquePaintEvent);
 
        //
        int w = 445;
        int h = 85;
        resize( w, h );
 
        bool ok = m_Background.load( Skin::getImagePath() + "/waveDisplay/bgsamplewavedisplay.png" );
        if( ok == false ){
                ERRORLOG( "Error loading pixmap" );
        }
 
        m_pPeakData = new int[ w ];
 
}
 
 
 
 
SampleWaveDisplay::~SampleWaveDisplay()
{
        //INFOLOG( "DESTROY" );
 
        delete[] m_pPeakData;
}
 
 
 
void SampleWaveDisplay::paintEvent(QPaintEvent *ev)
{
        QPainter painter( this );
        painter.setRenderHint( QPainter::Antialiasing );
        painter.drawPixmap( ev->rect(), m_Background, ev->rect() );
 
        painter.setPen( QColor( 102, 150, 205 ) );
        int VCenter = height() / 2;
        for ( int x = 0; x < width(); x++ ) {
                painter.drawLine( x, VCenter, x, m_pPeakData[x] + VCenter );
                painter.drawLine( x, VCenter, x, -m_pPeakData[x] + VCenter );
        }
 
        QFont font;
        font.setWeight( 63 );
        painter.setFont( font );
        painter.setPen( QColor( 255 , 255, 255, 200 ) );
        painter.drawText( 0, 0, width(), 20, Qt::AlignCenter, m_sSampleName );
}
 
 
 
void SampleWaveDisplay::updateDisplay( QString filename )
{
 
        auto pNewSample = Sample::load( filename );
 
        if ( pNewSample != nullptr ) {
                // Extract the filename from the complete path
                QString sName = filename;
                int nPos = sName.lastIndexOf( "/" );
 
                if ( sName.endsWith("emptySample.wav")){
                        m_sSampleName = "";
                }else
                {
                        m_sSampleName = sName.mid( nPos + 1, sName.length() );
                }
 
//              INFOLOG( "[updateDisplay] sample: " + m_sSampleName  );
 
                int nSampleLength = pNewSample->get_frames();
                float nScaleFactor = nSampleLength / width();
 
                float fGain = height() / 2.0 * 1.0;
 
                auto pSampleData = pNewSample->get_data_l();
 
                int nSamplePos =0;
                int nVal;
                for ( int i = 0; i < width(); ++i ){
                        nVal = 0;
                        for ( int j = 0; j < nScaleFactor; ++j ) {
                                if ( j < nSampleLength ) {
                                        int newVal = static_cast<int>( pSampleData[ nSamplePos ] * fGain );
                                        if ( newVal > nVal ) {
                                                nVal = newVal;
                                        }
                                }
                                ++nSamplePos;
                        }
                        m_pPeakData[ i ] = nVal;
                }
        }
 
        update();
 
}