WaveDisplay.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * Copyright(c) 2008-2025 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>
#include <core/Basics/InstrumentLayer.h>
using namespace H2Core;
 
#include "WaveDisplay.h"
#include "../Skin.h"
#include "../HydrogenApp.h"
 
WaveDisplay::WaveDisplay(QWidget* pParent)
 : QWidget( pParent )
 , m_nCurrentWidth( 0 )
 , m_sSampleName( "-" )
 , m_pLayer( nullptr )
 , m_SampleNameAlignment( Qt::AlignCenter )
{
        setAttribute(Qt::WA_OpaquePaintEvent);
 
        bool ok = m_Background.load( Skin::getImagePath() + "/waveDisplay/bgsamplewavedisplay.png" );
        if( ok == false ){
                ERRORLOG( "Error loading pixmap" );
        }
 
        m_pPeakData = new int[ width() ];
        memset( m_pPeakData, 0, width() * sizeof( m_pPeakData[0] ) );
        
        connect( HydrogenApp::get_instance(), &HydrogenApp::preferencesChanged, this, &WaveDisplay::onPreferencesChanged );
}
 
 
 
 
WaveDisplay::~WaveDisplay()
{
        //INFOLOG( "DESTROY" );
 
        delete[] m_pPeakData;
}
 
void WaveDisplay::paintEvent( QPaintEvent *ev ) {
        UNUSED(ev);
        QPainter painter( this );
 
        createBackground( &painter );
}
 
void WaveDisplay::createBackground( QPainter* painter ) {
        auto pPref = H2Core::Preferences::get_instance();
        
        painter->setRenderHint( QPainter::Antialiasing );
 
        QBrush brush = QBrush(Qt::red, m_Background);
        brush.setStyle(Qt::TexturePattern);
        painter->setBrush(brush);
        painter->drawRect(0, 0, width(), height());
        
        if( m_pLayer ){
                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( pPref->getApplicationFontFamily(), getPointSize( pPref->getFontSize() ) );
        font.setWeight( QFont::Bold );
        painter->setFont( font );
        painter->setPen( QColor( 255 , 255, 255, 200 ) );
        
        if( m_SampleNameAlignment == Qt::AlignCenter ){
                painter->drawText( 0, 0, width(), 20, m_SampleNameAlignment, m_sSampleName );
        } 
        else if( m_SampleNameAlignment == Qt::AlignLeft )
        {
                // Use a small offnset iso. starting directly at the left border
                painter->drawText( 20, 0, width(), 20, m_SampleNameAlignment, m_sSampleName );
        }
        
}
 
void WaveDisplay::resizeEvent( QResizeEvent * event )
{
        updateDisplay(m_pLayer);
}
 
 
 
void WaveDisplay::updateDisplay( std::shared_ptr<H2Core::InstrumentLayer> pLayer )
{
        int currentWidth = width();
        
        if(!pLayer || currentWidth <= 0){
                m_pLayer = nullptr;
                m_sSampleName = "-";
 
                update();
                return;
        }
        
        if(currentWidth != m_nCurrentWidth){
                delete[] m_pPeakData;
                m_pPeakData = new int[ currentWidth ];
                
                m_nCurrentWidth = currentWidth;
        }
        
        if ( pLayer && pLayer->get_sample() ) {
                m_pLayer = pLayer;
                m_sSampleName = pLayer->get_sample()->get_filename();
 
                //INFOLOG( "[updateDisplay] sample: " + m_sSampleName  );
 
                int nSampleLength = pLayer->get_sample()->get_frames();
                int nScaleFactor = nSampleLength / m_nCurrentWidth;
 
                float fGain = height() / 2.0 * pLayer->get_gain();
 
                auto pSampleData = pLayer->get_sample()->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 = (int)( pSampleData[ nSamplePos ] * fGain );
                                        if ( newVal > nVal ) {
                                                nVal = newVal;
                                        }
                                }
                                ++nSamplePos;
                        }
                        m_pPeakData[ i ] = nVal;
                }
        }
        else {
                m_pLayer = nullptr;
                m_sSampleName = "-";
                for ( int i =0; i < m_nCurrentWidth; ++i ){
                        m_pPeakData[ i ] = 0;
                }
                
        }
 
        update();
}
 
void WaveDisplay::mouseDoubleClickEvent(QMouseEvent *ev)
{
        if (ev->button() == Qt::LeftButton) {
            emit doubleClicked(this);
        }       
}
 
void WaveDisplay::onPreferencesChanged( H2Core::Preferences::Changes changes )
{
        if ( changes & H2Core::Preferences::Changes::Font ) {
                update();
        }
}