LUMIERA.clone/src/gui/widgets/video-display-widget.cpp

/*
  video-display-widget.cpp  -  Implementation of the video viewer widget
 
  Copyright (C)         Lumiera.org
    2008,               Joel Holdsworth <joel@airwebreathe.org.uk>
 
  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.
 
* *****************************************************/

#include <gdkmm/drawable.h>
#include <gdkmm/general.h>
#include <cairomm-1.0/cairomm/cairomm.h>

#include "../output/xvdisplayer.hpp"
#include "../output/gdkdisplayer.hpp"

#include "video-display-widget.hpp"

namespace lumiera {
namespace gui {
namespace widgets {

VideoDisplayWidget::VideoDisplayWidget() :
  gdkWindow(NULL),
  displayer(NULL)
  {
    set_flags(Gtk::NO_WINDOW);
  }

VideoDisplayWidget::~VideoDisplayWidget()
  {
    if(displayer != NULL)
      delete displayer;
  }

void
VideoDisplayWidget::on_realize()
  {
    set_flags(Gtk::NO_WINDOW);

    // Call base class:
    Gtk::Widget::on_realize();

    // Create the GdkWindow:
    GdkWindowAttr attributes;
    memset(&attributes, 0, sizeof(attributes));

    Gtk::Allocation allocation = get_allocation();

    // Set initial position and size of the Gdk::Window:
    attributes.x = allocation.get_x();
    attributes.y = allocation.get_y();
    attributes.width = allocation.get_width();
    attributes.height = allocation.get_height();

    attributes.event_mask = get_events () | Gdk::EXPOSURE_MASK; 
    attributes.window_type = GDK_WINDOW_CHILD;
    attributes.wclass = GDK_INPUT_OUTPUT;

    gdkWindow = Gdk::Window::create(get_window() /* parent */, &attributes,
            GDK_WA_X | GDK_WA_Y);
    unset_flags(Gtk::NO_WINDOW);
    set_window(gdkWindow);

    // Set colors
    modify_bg(Gtk::STATE_NORMAL, Gdk::Color("black"));

    // Make the widget receive expose events
    gdkWindow->set_user_data(gobj());

    if(displayer != NULL)
      delete displayer;
    displayer = createDisplayer(this, 320, 240);

    add_events(Gdk::ALL_EVENTS_MASK);
  }

void
VideoDisplayWidget::on_unrealize()
  {
    gdkWindow.clear();

    //Call base class:
    Gtk::Widget::on_unrealize();
  }

bool 
VideoDisplayWidget::on_button_press_event (GdkEventButton* event)
  {
    unsigned char buffer[320 * 240 * 4];

    for(int i = 0; i < 320*240*4; i++)
      buffer[i] = rand();

    displayer->put((void*)buffer);

    return true;
  }

bool
VideoDisplayWidget::on_expose_event(GdkEventExpose* event)
  {
    // This is where we draw on the window
    /*Glib::RefPtr<Gdk::Window> window = get_window();
    if(window)
    {
      Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
      if(event)
      {
        // clip to the area that needs to be re-exposed so we don't draw any
        // more than we need to.
        cr->rectangle(event->area.x, event->area.y,
                event->area.width, event->area.height);
        cr->clip();
      }

      // Paint the background
      cr->set_source_rgb(0.0, 0.0, 0.0);
      cr->paint();
    }*/
    return true;
  }

Displayer*
VideoDisplayWidget::createDisplayer( Gtk::Widget *drawingArea, int width, int height )
  {
    Displayer *displayer = NULL;

    displayer = new XvDisplayer( drawingArea, width, height );
    if ( !displayer->usable() )
    {
      delete displayer;
      displayer = NULL;
    }

    if ( displayer == NULL )
    {
      displayer = new GdkDisplayer( drawingArea, width, height );
    }

    return displayer;
  }

}   // namespace widgets
}   // namespace gui
}   // namespace lumiera