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