hashtags/lmms
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 1 Wiki Activity

heavily improved performance by using QPainter::drawPolylines and disabling anti-aliasing if more than 60000 samples have to be drawn (closes #1938413)

Browse Source 
git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1429 0778d3d1-df1d-0410-868b-ea421aaaa00d
This commit is contained in:
Tobias Doerffel
2008-08-01 23:56:19 +00:00
parent 3ca3e7fa56
commit f21b858f5e
1 changed files with 19 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
src/core/sample_buffer.cpp
View File

@@ -689,35 +689,31 @@ void sampleBuffer::visualize( QPainter & _p, const QRect & _dr,
// _p.setClipRect( _clip );
// _p.setPen( QColor( 0x22, 0xFF, 0x44 ) );
//_p.setPen( QColor( 64, 224, 160 ) );
#warning TODO: save and restore aa-settings
_p.setRenderHint( QPainter::Antialiasing );
const int w = _dr.width();
const int h = _dr.height();
const float y_base = h / 2 + _dr.y();
const float y_space = h / 2;
const int yb = h / 2 + _dr.y();
const float y_space = h*0.25f;
const QRect isect = _dr.intersect( _clip );
int old_y[DEFAULT_CHANNELS] = { y_base, y_base };
_p.setPen( QPen( _p.pen().color(), 0.5 ) );
const f_cnt_t fpp = tLimit<f_cnt_t>( m_frames / w, 1, 20 );
int old_x = _clip.x();
for( f_cnt_t frame = 0; frame < m_frames; frame += fpp )
if( m_frames < 60000 )
{
const float x = _dr.x() + ( frame /
(float) m_frames * _dr.width() );
for( ch_cnt_t chnl = 0; chnl < DEFAULT_CHANNELS; ++chnl )
{
const Uint16 y = y_base - (
m_data[frame][chnl] * y_space );
_p.drawLine( QLineF( old_x, old_y[chnl], x, y+0.5 ) );
old_y[chnl] = y;
}
old_x = x;
_p.setRenderHint( QPainter::Antialiasing );
QColor c = _p.pen().color();
_p.setPen( QPen( c, 0.7 ) );
}
// _p.setClipping( FALSE );
const int fpp = tLimit<int>( m_frames / w, 1, 20 );
QPoint * l = new QPoint[m_frames / fpp + 1];
int n = 0;
const int xb = _dr.x();
for( int frame = 0; frame < m_frames; frame += fpp )
{
l[n] = QPoint( xb + ( frame * w / m_frames ),
yb - ( ( m_data[frame][0]+m_data[frame][1] ) *
y_space ) );
++n;
}
_p.drawPolyline( l, m_frames / fpp );
delete[] l;
}