display-service.hpp

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/*
  DISPLAY-SERVICE.hpp  -  service providing access to a display for outputting frames

  Copyright (C)         Lumiera.org
    2009,               Hermann Vosseler <Ichthyostega@web.de>

  This program 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 program 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, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef STAGE_DISPLAY_SERVICE_H
#define STAGE_DISPLAY_SERVICE_H


#include "include/display-facade.h"
#include "common/instancehandle.hpp"
#include "lib/scoped-ptrvect.hpp"
#include "include/logging.h"
#include "lib/nocopy.hpp"

#include <glibmm.h>
#include <sigc++/sigc++.h>
#include <string>
#include <vector>


namespace stage {
  
  using std::string;
  using std::vector;
  using lumiera::Display;
  using Glib::Dispatcher;
  
  
  typedef sigc::slot<void, void*> FrameDestination;
  typedef sigc::signal<void, void*> FrameSignal;
  
  
  
  /****************************************************************/
  class DisplayerSlot
    : public lumiera_displaySlot,
      util::NonCopyable
    {
      Dispatcher dispatcher_;
      FrameSignal hasFrame_;
      
      LumieraDisplayFrame currBuffer_;
      
      
    public:
      DisplayerSlot (FrameDestination const&) ;
     ~DisplayerSlot () ;
      
      /* Implementation-level API to be used by DisplayService */
      
      inline void put (LumieraDisplayFrame);
      
      
    private:
      void displayCurrentFrame();
      
    };
  
  typedef lib::ScopedPtrVect<DisplayerSlot> DisplayerTab;
  
  
  
  /**************************************************/
  class DisplayService
    : util::NonCopyable
    {
      
      string error_;
      DisplayerTab slots_;
      
      
      /* === Interface Lifecycle === */
      
      typedef lumiera::InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_Display, 0)
                                     , lumiera::Display
                                     > ServiceInstanceHandle;
      ServiceInstanceHandle serviceInstance_;
      
      
    public:
      DisplayService();
     ~DisplayService() { INFO (proc_dbg, "Display service dying..."); }
      
      
      static LumieraDisplaySlot setUp (FrameDestination const&);
      
      
      void allocate (LumieraDisplaySlot, bool doAllocate);
      
      
      DisplayerSlot& resolve (LumieraDisplaySlot);
      
    };
  
  
  
  
  void
  DisplayerSlot::put(LumieraDisplayFrame newFrame)
  {
    if (newFrame != currBuffer_)
      {
        currBuffer_ = newFrame;
        dispatcher_.emit();
      }
    else
      {
        TRACE (render, "frame dropped?");
      }
  }
  
  
  
} // namespace stage
#endif