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/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This 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 software 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 "CompositeEngine.h"
#include "Debug.h"
#include "XcbUtil.h"
#if HAVE_XCB
#include <xcb/xcb.h>
#endif
namespace Transparency
{
//_______________________________________________________________
CompositeEngine& CompositeEngine::get()
{
//! singleton
static CompositeEngine singleton;
return singleton;
}
//_______________________________________________________________
CompositeEngine::CompositeEngine():
available_( false ),
initialized_( false )
{ Debug::Throw( "CompositeEngine::CompositeEngine.\n" ); }
//_______________________________________________________________
void CompositeEngine::_initialize()
{
Debug::Throw( "CompositeEngine::initialize\n" );
if( !initialized_ )
{
initialized_ = true;
available_ = _compositingAvailable();
}
}
//_______________________________________________________________
bool CompositeEngine::_compositingAvailable() const
{
Debug::Throw( "CompositeEngine::_compositingAvailable\n" );
#if defined(Q_OS_WIN)
return true;
#endif
#if HAVE_XCB
if( !XcbUtil::isX11() ) return false;
// connection
xcb_connection_t* connection( XcbUtil::get().connection<xcb_connection_t>() );
// atom
const QString atomName( QString( "_NET_WM_CM_S%1" ).arg( XcbUtil::get().defaultScreenNumber() ) );
xcb_atom_t atom( *XcbUtil::get().atom<xcb_atom_t>( atomName ) );
// selection owner
xcb_get_selection_owner_cookie_t cookie( xcb_get_selection_owner( connection, atom ) );
XcbUtil::ScopedPointer<xcb_get_selection_owner_reply_t> reply( xcb_get_selection_owner_reply( connection, cookie, nullptr ) );
return reply && reply->owner;
#endif
// on all other systems, return false
return false;
}
}
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