kwin/effects/magnifier.cpp

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/*****************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>
You can Freely distribute this program under the GNU General Public
License. See the file "COPYING" for the exact licensing terms.
******************************************************************/
#include <config-X11.h> // HAVE_OPENGL
#include "magnifier.h"
#include <kaction.h>
#include <kactioncollection.h>
#include <kstandardaction.h>
#ifdef HAVE_OPENGL
#include <GL/gl.h>
#endif
namespace KWin
{
KWIN_EFFECT( magnifier, MagnifierEffect )
const int FRAME_WIDTH = 5;
MagnifierEffect::MagnifierEffect()
: zoom( 1 )
, target_zoom( 1 )
{
KActionCollection* actionCollection = new KActionCollection( this );
KAction* a;
a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomIn, this, SLOT( zoomIn())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Equal));
a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomOut, this, SLOT( zoomOut())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Minus));
a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ActualSize, this, SLOT( toggle())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_0));
magnifier_size = QSize( 200, 200 ); // TODO config option
}
void MagnifierEffect::prePaintScreen( ScreenPrePaintData& data, int time )
{
if( zoom != target_zoom )
{
double diff = time / 500.0;
if( target_zoom > zoom )
zoom = qMin( zoom * qMax( 1 + diff, 1.2 ), target_zoom );
else
zoom = qMax( zoom * qMin( 1 - diff, 0.8 ), target_zoom );
}
effects->prePaintScreen( data, time );
data.paint |= magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH );
}
void MagnifierEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
{
ScreenPaintData data2 = data;
effects->paintScreen( mask, region, data ); // paint normal screen
if( zoom != 1.0 )
{ // paint magnifier
// ## TODO this should be inside HAVE_OPENGL
glPushAttrib( GL_ENABLE_BIT );
QRect area = magnifierArea();
glEnable( GL_SCISSOR_TEST );
int dh = displayHeight();
// Scissor rect has to be given in OpenGL coords
glScissor( area.x(), dh - area.y() - area.height(), area.width(), area.height());
mask |= PAINT_SCREEN_TRANSFORMED;
data2.xScale *= zoom;
data2.yScale *= zoom;
QPoint cursor = cursorPos();
// set the position so that the cursor is in the same position in the scaled view
data2.xTranslate = - int( cursor.x() * ( zoom - 1 ));
data2.yTranslate = - int( cursor.y() * ( zoom - 1 ));
effects->paintScreen( mask, region, data2 );
glPopAttrib();
glPushAttrib( GL_CURRENT_BIT );
glColor4f( 0, 0, 0, 1 ); // black
glBegin( GL_QUADS );
glVertex2i( area.left() - FRAME_WIDTH, area.top() - FRAME_WIDTH ); // top frame
glVertex2i( area.right() + FRAME_WIDTH, area.top() - FRAME_WIDTH );
glVertex2i( area.right() + FRAME_WIDTH, area.top() - 1 );
glVertex2i( area.left() - FRAME_WIDTH, area.top() - 1 );
glVertex2i( area.left() - FRAME_WIDTH, area.top() - FRAME_WIDTH ); // left frame
glVertex2i( area.left() - 1, area.top() - FRAME_WIDTH );
glVertex2i( area.left() - 1, area.bottom() + FRAME_WIDTH );
glVertex2i( area.left() - FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
glVertex2i( area.right() + 1, area.top() - FRAME_WIDTH ); // right frame
glVertex2i( area.right() + FRAME_WIDTH, area.top() - FRAME_WIDTH );
glVertex2i( area.right() + FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
glVertex2i( area.right() + 1, area.bottom() + FRAME_WIDTH );
glVertex2i( area.left() - FRAME_WIDTH, area.bottom() + 1 ); // bottom frame
glVertex2i( area.right() + FRAME_WIDTH, area.bottom() + 1 );
glVertex2i( area.right() + FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
glVertex2i( area.left() - FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
glEnd();
glPopAttrib();
}
}
void MagnifierEffect::postPaintScreen()
{
if( zoom != target_zoom )
effects->addRepaint( magnifierArea());
effects->postPaintScreen();
}
QRect MagnifierEffect::magnifierArea( QPoint pos ) const
{
return QRect( pos.x() - magnifier_size.width() / 2, pos.y() - magnifier_size.height() / 2,
magnifier_size.width(), magnifier_size.height());
}
void MagnifierEffect::zoomIn()
{
target_zoom *= 1.2;
effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
}
void MagnifierEffect::zoomOut()
{
target_zoom /= 1.2;
if( target_zoom < 1 )
target_zoom = 1;
effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
}
void MagnifierEffect::toggle()
{
if( target_zoom == 1.0 )
target_zoom = 2;
else
target_zoom = 1;
effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
}
void MagnifierEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons, Qt::KeyboardModifiers )
{
if( pos != old && zoom != 1 )
effects->addRepaint( magnifierArea( old ).adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
}
} // namespace
#include "magnifier.moc"