File indexing completed on 2024-05-12 05:46:31

 /****************************************************************************************
  * Copyright (c) 2003-2005 Max Howell <max.howell@methylblue.com>                       *
  * Copyright (c) 2005 Mark Kretschmann <kretschmann@kde.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 <http://www.gnu.org/licenses/>.                           *
  ****************************************************************************************/
 
 #include "blockAnalyzer.h"
 
 #include <cmath>
 
 #include <QPainter>        //paletteChange()
 
 static inline uint myMax( uint v1, uint v2 ) { return v1 > v2 ? v1 : v2; }
 
 BlockAnalyzer::BlockAnalyzer( QWidget *parent )
     : Analyzer::Base2D( parent, 9 )
     , m_columns( 0 )         //uint
     , m_rows( 0 )            //uint
     , m_y( 0 )               //uint
     , m_barPixmap( 1, 1 )    //null qpixmaps cause crashes
     , m_topBarPixmap( WIDTH, HEIGHT )
     , m_scope( MIN_COLUMNS ) //Scope
     , m_store( 1 << 8, 0 )   //vector<uint>
     , m_fade_bars( FADE_SIZE ) //vector<QPixmap>
     , m_fade_pos( 1 << 8, 50 ) //vector<uint>
     , m_fade_intensity( 1 << 8, 32 ) //vector<uint>
 {
     setMinimumSize( MIN_COLUMNS*(WIDTH+1) -1, MIN_ROWS*(HEIGHT+1) -1 ); //-1 is padding, no drawing takes place there
     setMaximumWidth( MAX_COLUMNS*(WIDTH+1) -1 );
     setMaximumHeight( MIN_ROWS*(HEIGHT+1) -1 );
 
     // mxcl says null pixmaps cause crashes, so let's play it safe
     for (int i = 0; i < FADE_SIZE; ++i)
         m_fade_bars[i] = QPixmap( 1, 1 );
 }
 
 BlockAnalyzer::~BlockAnalyzer()
 {
 }
 
 void
 BlockAnalyzer::resizeEvent( QResizeEvent *e )
 {
     Analyzer::Base2D::resizeEvent( e );
 
     const uint oldRows = m_rows;
 
     //all is explained in analyze()..
     //+1 to counter -1 in maxSizes, trust me we need this!
     m_columns = qMin<uint>( uint(double(width()+1) / (WIDTH+1)), MAX_COLUMNS );
     m_rows    = uint(double(height()+1) / (HEIGHT+1));
 
     //this is the y-offset for drawing from the top of the widget
     m_y = (height() - (m_rows * (HEIGHT+1)) + 2) / 2;
 
     m_scope.resize( m_columns );
 
     if( m_rows != oldRows ) {
         m_barPixmap = QPixmap( WIDTH, m_rows*(HEIGHT+1) );
 
         for (int i = 0; i < FADE_SIZE; ++i)
             m_fade_bars[i] = QPixmap( WIDTH, m_rows*(HEIGHT+1) );
 
         m_yscale.resize( m_rows + 1 );
 
         const float PRE = 1, PRO = 1; //PRE and PRO allow us to restrict the range somewhat
 
         for( uint z = 0; z < m_rows; ++z )
             m_yscale[z] = 1 - (log10( PRE+z ) / log10( PRE+m_rows+PRO ));
 
         m_yscale[m_rows] = 0;
 
         determineStep();
         paletteChange( palette() );
     }
     else if( width() > e->oldSize().width() || height() > e->oldSize().height() )
         drawBackground();
 
     analyze( m_scope );
 }
 
 void
 BlockAnalyzer::determineStep()
 {
     // falltime is dependent on rowcount due to our digital resolution (ie we have boxes/blocks of pixels)
     // I calculated the value 30 based on some trial and error
 
     const double fallTime = 30 * m_rows;
     m_step = double(m_rows * 80) / fallTime; //80 = ~milliseconds between signals with audio data
 }
 
 void
 BlockAnalyzer::transform( QVector<float> &s ) //pure virtual
 {
     for(int x = 0; x < s.size(); ++x)
         s[x] *= 2;
 
     float *front = static_cast<float*>( &s.front() );
 
     m_fht->spectrum( front );
     m_fht->scale( front, 1.0 / 20 );
 
     //the second half is pretty dull, so only show it if the user has a large analyzer
     //by setting to m_scope.size() if large we prevent interpolation of large analyzers, this is good!
     s.resize( m_scope.size() <= MAX_COLUMNS/2 ? MAX_COLUMNS/2 : m_scope.size() );
 }
 
 void
 BlockAnalyzer::analyze( const QVector<float> &s )
 {
     Analyzer::interpolate( s, m_scope );
     update();
 }
 
 void
 BlockAnalyzer::paintEvent(QPaintEvent*)
 {
     // y = 2 3 2 1 0 2
     //     . . . . # .
     //     . . . # # .
     //     # . # # # #
     //     # # # # # #
     //
     // visual aid for how this analyzer works.
     // y represents the number of blanks
     // y starts from the top and increases in units of blocks
 
     // m_yscale looks similar to: { 0.7, 0.5, 0.25, 0.15, 0.1, 0 }
     // if it contains 6 elements there are 5 rows in the analyzer
 
 
     QPainter p( this );
 
     // Paint the background
     p.drawPixmap(0, 0, m_background);
     //   p.fillRect(rect(), palette().color( QPalette::Active, QPalette::Window ));
 
     uint y;
 
     for(int x = 0; x < m_scope.size(); ++x)
     {
         // determine y
         for( y = 0; m_scope[x] < m_yscale[y]; ++y )
             ;
 
         // this is opposite to what you'd think, higher than y
         // means the bar is lower than y (physically)
         if( (float)y > m_store[x] )
             y = uint(m_store[x] += m_step);
         else
             m_store[x] = y;
 
         // if y is lower than m_fade_pos, then the bar has exceeded the height of the fadeout
         // if the fadeout is quite faded now, then display the new one
         if(y <= m_fade_pos[x] /*|| m_fade_intensity[x] < FADE_SIZE / 3*/) {
             m_fade_pos[x] = y;
             m_fade_intensity[x] = FADE_SIZE;
         }
 
         if( m_fade_intensity[x] > 0 ) {
             const uint offset = --m_fade_intensity[x];
             const uint y = m_y + (m_fade_pos[x] * (HEIGHT+1));
             p.drawPixmap( x*(WIDTH+1), y, m_fade_bars[offset], 0, 0, WIDTH, height() - y );
         }
 
         if( m_fade_intensity[x] == 0 )
             m_fade_pos[x] = m_rows;
 
         //REMEMBER: y is a number from 0 to m_rows, 0 means all blocks are glowing, m_rows means none are
         p.drawPixmap( x*(WIDTH+1), y*(HEIGHT+1) + m_y, *bar(), 0, y*(HEIGHT+1), -1, -1 );
     }
 
     for( uint x = 0; x < m_store.size(); ++x )
         p.drawPixmap( x*(WIDTH+1), int(m_store[x])*(HEIGHT+1) + m_y, m_topBarPixmap );
 }
 
 
 
 
 
 static inline void
 adjustToLimits( int &b, int &f, uint &amount )
 {
     // with a range of 0-255 and maximum adjustment of amount,
     // maximise the difference between f and b
 
     if( b < f ) {
         if( b > 255 - f ) {
             amount -= f;
             f = 0;
         } else {
             amount -= (255 - f);
             f = 255;
         }
     }
     else {
         if( f > 255 - b ) {
             amount -= f;
             f = 0;
         } else {
             amount -= (255 - f);
             f = 255;
         }
     }
 }
 
 /**
  * Clever contrast function
  *
  * It will try to adjust the foreground color such that it contrasts well with the background
  * It won't modify the hue of fg unless absolutely necessary
  * @return the adjusted form of fg
  */
 QColor
 ensureContrast( const QColor &bg, const QColor &fg, uint _amount = 150 )
 {
     class OutputOnExit {
     public:
         OutputOnExit( const QColor &color ) : c( color ) {}
         ~OutputOnExit() { int h,s,v; c.getHsv( &h, &s, &v ); }
     private:
         const QColor &c;
     };
 
     // hack so I don't have to cast everywhere
 #define amount static_cast<int>(_amount)
     //     #define STAMP debug() << (QValueList<int>() << fh << fs << fv);
     //     #define STAMP1( string ) debug() << string << ": " << (QValueList<int>() << fh << fs << fv);
     //     #define STAMP2( string, value ) debug() << string << "=" << value << ": " << (QValueList<int>() << fh << fs << fv);
 
     OutputOnExit allocateOnTheStack( fg );
 
     int bh, bs, bv;
     int fh, fs, fv;
 
     bg.getHsv( &bh, &bs, &bv );
     fg.getHsv( &fh, &fs, &fv );
 
     int dv = abs( bv - fv );
 
     //     STAMP2( "DV", dv );
 
     // value is the best measure of contrast
     // if there is enough difference in value already, return fg unchanged
     if( dv > amount )
         return fg;
 
     int ds = abs( bs - fs );
 
     //     STAMP2( "DS", ds );
 
     // saturation is good enough too. But not as good. TODO adapt this a little
     if( ds > amount )
         return fg;
 
     int dh = abs( bh - fh );
 
     //     STAMP2( "DH", dh );
 
     if( dh > 120 ) {
         // a third of the colour wheel automatically guarentees contrast
         // but only if the values are high enough and saturations significant enough
         // to allow the colours to be visible and not be shades of grey or black
 
         // check the saturation for the two colours is sufficient that hue alone can
         // provide sufficient contrast
         if( ds > amount / 2 && (bs > 125 && fs > 125) )
             //             STAMP1( "Sufficient saturation difference, and hues are compliemtary" );
             return fg;
         else if( dv > amount / 2 && (bv > 125 && fv > 125) )
             //             STAMP1( "Sufficient value difference, and hues are compliemtary" );
             return fg;
 
         //         STAMP1( "Hues are complimentary but we must modify the value or saturation of the contrasting colour" );
 
         //but either the colours are two desaturated, or too dark
         //so we need to adjust the system, although not as much
         ///_amount /= 2;
     }
 
     if( fs < 50 && ds < 40 ) {
         // low saturation on a low saturation is sad
         const int tmp = 50 - fs;
         fs = 50;
         if( amount > tmp )
             _amount -= tmp;
         else
             _amount = 0;
     }
 
     // test that there is available value to honor our contrast requirement
     if( 255 - dv < amount )
     {
         // we have to modify the value and saturation of fg
         //adjustToLimits( bv, fv, amount );
 
         //         STAMP
 
         // see if we need to adjust the saturation
         if( amount > 0 )
             adjustToLimits( bs, fs, _amount );
 
         //         STAMP
 
         // see if we need to adjust the hue
         if( amount > 0 )
             fh += amount; // cycles around;
 
         //         STAMP
 
         return QColor::fromHsv( fh, fs, fv );
     }
 
     //     STAMP
 
     if( fv > bv && bv > amount )
         return QColor::fromHsv( fh, fs, bv - amount );
 
     //     STAMP
 
     if( fv < bv && fv > amount )
         return QColor::fromHsv( fh, fs, fv - amount );
 
     //     STAMP
 
     if( fv > bv && (255 - fv > amount) )
         return QColor::fromHsv( fh, fs, fv + amount );
 
     //     STAMP
 
     if( fv < bv && (255 - bv > amount ) )
         return QColor::fromHsv( fh, fs, bv + amount );
 
     //     STAMP
     //     debug() << "Something went wrong!\n";
 
     return Qt::blue;
 
 #undef amount
     //     #undef STAMP
 }
 
 void
 BlockAnalyzer::paletteChange( const QPalette& )
 {
     const QColor bg = palette().color(QPalette::Active, QPalette::Window);
     const QColor fg = ensureContrast(bg, palette().color(QPalette::Active, QPalette::WindowText));
 
     m_topBarPixmap.fill( fg );
 
     const double dr = 15*double(bg.red()   - fg.red())   / (m_rows*16);
     const double dg = 15*double(bg.green() - fg.green()) / (m_rows*16);
     const double db = 15*double(bg.blue()  - fg.blue())  / (m_rows*16);
     const int r = fg.red(), g = fg.green(), b = fg.blue();
 
     bar()->fill( bg );
 
     QPainter p( bar() );
     for( int y = 0; (uint)y < m_rows; ++y )
         //graduate the fg color
         p.fillRect( 0, y*(HEIGHT+1), WIDTH, HEIGHT, QColor( r+int(dr*y), g+int(dg*y), b+int(db*y) ) );
 
     {
         const QColor bg = palette().color( QPalette::Active, QPalette::Window ).darker(112);
 
         //make a complimentary fadebar colour
         //TODO dark is not always correct, dumbo!
         int h,s,v; palette().color( QPalette::Active, QPalette::Window ).darker(150).getHsv( &h, &s, &v );
         const QColor fg = QColor::fromHsv( h + 60, s, v );
 
         const double dr = fg.red() - bg.red();
         const double dg = fg.green() - bg.green();
         const double db = fg.blue() - bg.blue();
         const int r = bg.red(), g = bg.green(), b = bg.blue();
 
         // Precalculate all fade-bar pixmaps
         for(int y = 0; y < FADE_SIZE; ++y) {
             m_fade_bars[y].fill( palette().color( QPalette::Active, QPalette::Window ) );
             QPainter f( &m_fade_bars[y] );
             for( int z = 0; (uint)z < m_rows; ++z ) {
                 const double Y = 1.0 - (log10( static_cast<float>(FADE_SIZE) - y ) / log10( static_cast<float>(FADE_SIZE) ));
                 f.fillRect( 0, z*(HEIGHT+1), WIDTH, HEIGHT, QColor( r+int(dr*Y), g+int(dg*Y), b+int(db*Y) ) );
             }
         }
     }
 
     drawBackground();
 }
 
 void
 BlockAnalyzer::drawBackground()
 {
     const QColor bg = palette().color( QPalette::Active, QPalette::Window);
     const QColor bgdark = bg.darker(112);
 
     m_background.fill( bg );
 
     QPainter p( &m_background );
     for( int x = 0; (uint)x < m_columns; ++x )
         for( int y = 0; (uint)y < m_rows; ++y )
             p.fillRect( x*(WIDTH+1), y*(HEIGHT+1) + m_y, WIDTH, HEIGHT, bgdark );
 
 }