workspace/kwin/effects/magnifier.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
   6 Copyright (C) 2007 Christian Nitschkowski <christian.nitschkowski@kdemail.net>
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 *********************************************************************/
  21
  22 #include "magnifier.h"
  23
  24 #include <kwinconfig.h>
  25
  26 #include <kaction.h>
  27 #include <kactioncollection.h>
  28 #include <kconfiggroup.h>
  29 #include <kstandardaction.h>
  30
  31 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
  32 #include <GL/gl.h>
  33 #endif
  34
  35 namespace KWin
  36 {
  37
  38 KWIN_EFFECT( magnifier, MagnifierEffect )
  39
  40 const int FRAME_WIDTH = 5;
  41
  42 MagnifierEffect::MagnifierEffect()
  43     : zoom( 1 )
  44     , target_zoom( 1 )
  45     {
  46     KActionCollection* actionCollection = new KActionCollection( this );
  47     KAction* a;
  48     a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomIn, this, SLOT( zoomIn())));
  49     a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Equal));
  50     a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomOut, this, SLOT( zoomOut())));
  51     a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Minus));
  52     a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ActualSize, this, SLOT( toggle())));
  53     a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_0));
  54     reconfigure( ReconfigureAll );
  55     }
  56
  57 void MagnifierEffect::reconfigure( ReconfigureFlags )
  58     {
  59     KConfigGroup conf = EffectsHandler::effectConfig("Magnifier");
  60     int width, height;
  61     width = conf.readEntry("Width", 200);
  62     height = conf.readEntry("Height", 200);
  63     magnifier_size = QSize( width, height );
  64     }
  65
  66 void MagnifierEffect::prePaintScreen( ScreenPrePaintData& data, int time )
  67     {
  68     if( zoom != target_zoom )
  69         {
  70         double diff = time / animationTime( 500.0 );
  71         if( target_zoom > zoom )
  72             zoom = qMin( zoom * qMax( 1 + diff, 1.2 ), target_zoom );
  73         else
  74             zoom = qMax( zoom * qMin( 1 - diff, 0.8 ), target_zoom );
  75         }
  76     effects->prePaintScreen( data, time );
  77     if( zoom != 1.0 )
  78         data.paint |= magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH );
  79     }
  80
  81 void MagnifierEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
  82     {
  83     ScreenPaintData data2 = data;
  84     effects->paintScreen( mask, region, data ); // paint normal screen
  85     if( zoom != 1.0 )
  86         { // paint magnifier
  87         QRect area = magnifierArea();
  88         PaintClipper::push( area ); // don't allow any painting outside of the area
  89         mask |= PAINT_SCREEN_TRANSFORMED;
  90         data2.xScale *= zoom;
  91         data2.yScale *= zoom;
  92         QPoint cursor = cursorPos();
  93         // set the position so that the cursor is in the same position in the scaled view
  94         data2.xTranslate = - int( cursor.x() * ( zoom - 1 ));
  95         data2.yTranslate = - int( cursor.y() * ( zoom - 1 ));
  96         effects->paintScreen( mask, region, data2 );
  97         PaintClipper::pop( area );
  98 // ## TODO this should be inside KWIN_HAVE_OPENGL_COMPOSITING
  99         glPushAttrib( GL_CURRENT_BIT );
 100         glColor4f( 0, 0, 0, 1 ); // black
 101         for( PaintClipper::Iterator iterator;
 102              !iterator.isDone();
 103              iterator.next())
 104             {
 105             glBegin( GL_QUADS );
 106             glVertex2i( area.left() - FRAME_WIDTH, area.top() - FRAME_WIDTH ); // top frame
 107             glVertex2i( area.right() + FRAME_WIDTH, area.top() - FRAME_WIDTH );
 108             glVertex2i( area.right() + FRAME_WIDTH, area.top() - 1 );
 109             glVertex2i( area.left() - FRAME_WIDTH, area.top() - 1 );
 110             glVertex2i( area.left() - FRAME_WIDTH, area.top() - FRAME_WIDTH ); // left frame
 111             glVertex2i( area.left() - 1, area.top() - FRAME_WIDTH );
 112             glVertex2i( area.left() - 1, area.bottom() + FRAME_WIDTH );
 113             glVertex2i( area.left() - FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
 114             glVertex2i( area.right() + 1, area.top() - FRAME_WIDTH ); // right frame
 115             glVertex2i( area.right() + FRAME_WIDTH, area.top() - FRAME_WIDTH );
 116             glVertex2i( area.right() + FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
 117             glVertex2i( area.right() + 1, area.bottom() + FRAME_WIDTH );
 118             glVertex2i( area.left() - FRAME_WIDTH, area.bottom() + 1 ); // bottom frame
 119             glVertex2i( area.right() + FRAME_WIDTH, area.bottom() + 1 );
 120             glVertex2i( area.right() + FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
 121             glVertex2i( area.left() - FRAME_WIDTH, area.bottom() + FRAME_WIDTH );
 122             glEnd();
 123             }
 124         glPopAttrib();
 125         }
 126     }
 127
 128 void MagnifierEffect::postPaintScreen()
 129     {
 130     if( zoom != target_zoom )
 131     {
 132         QRect framedarea = magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH );
 133         effects->addRepaint( framedarea );
 134     }
 135     effects->postPaintScreen();
 136     }
 137
 138 QRect MagnifierEffect::magnifierArea( QPoint pos ) const
 139     {
 140     return QRect( pos.x() - magnifier_size.width() / 2, pos.y() - magnifier_size.height() / 2,
 141         magnifier_size.width(), magnifier_size.height());
 142     }
 143
 144 void MagnifierEffect::zoomIn()
 145     {
 146     target_zoom *= 1.2;
 147     effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
 148     }
 149
 150 void MagnifierEffect::zoomOut()
 151     {
 152     target_zoom /= 1.2;
 153     if( target_zoom < 1 )
 154         target_zoom = 1;
 155     effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
 156     }
 157
 158 void MagnifierEffect::toggle()
 159     {
 160     if( target_zoom == 1.0 )
 161         target_zoom = 2;
 162     else
 163         target_zoom = 1;
 164     effects->addRepaint( magnifierArea().adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
 165     }
 166
 167 void MagnifierEffect::mouseChanged( const QPoint& pos, const QPoint& old,
 168     Qt::MouseButtons, Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
 169     {
 170     if( pos != old && zoom != 1 )
 171         effects->addRepaint( magnifierArea( old ).adjusted( -FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH ));
 172     }
 173
 174 } // namespace
 175
 176 #include "magnifier.moc"