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