Different outputs over X and over DirectFB

/*Hi .. I have modified scribble-simple.c from gtk/examples to check the behaviour of foregrond/background color of this application over X and then over DFB. in expose_event() I have set the new foreground color, it is working fine over X but over DirectFB it doesn't has any effect... any reason/explanation..*/

#include <stdlib.h>
#include <gtk/gtk.h>

/* Backing pixmap for drawing area */
static GdkPixmap *pixmap = NULL;

/* Create a new backing pixmap of the appropriate size */
static gboolean configure_event( GtkWidget         *widget,
                                 GdkEventConfigure *event )
  GdkColor color;

  if (pixmap)
    g_object_unref (pixmap);
  color.red = 0xffff;
  color.green = 0xffff;
  color.blue = 0x0;
  gdk_gc_set_rgb_fg_color (widget->style->white_gc, &color);

  pixmap = gdk_pixmap_new (widget->window,
  gdk_draw_rectangle (pixmap,
		      0, 0,

  return TRUE;

/* Redraw the screen from the backing pixmap */
static gboolean expose_event( GtkWidget      *widget,
                              GdkEventExpose *event )
 GdkColor color;

 color.red = 0xffff;

  gdk_gc_set_rgb_fg_color (widget->style->fg_gc[GTK_WIDGET_STATE(widget)], &color);                                                                                        
  gdk_draw_drawable (widget->window,
		     widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
		     event->area.x, event->area.y,
		     event->area.x, event->area.y,
		     event->area.width, event->area.height);

  return FALSE;

/* Draw a rectangle on the screen */
static void draw_brush( GtkWidget *widget,
                        gdouble    x,
                        gdouble    y)
  GdkRectangle update_rect;

  update_rect.x = x - 5;
  update_rect.y = y - 5;
  update_rect.width = 10;
  update_rect.height = 10;

  gdk_draw_rectangle (pixmap,
		      update_rect.x, update_rect.y,
		      update_rect.width, update_rect.height);
  gtk_widget_queue_draw_area (widget, 
		              update_rect.x, update_rect.y,
		              update_rect.width, update_rect.height);

static gboolean button_press_event( GtkWidget      *widget,
                                    GdkEventButton *event )
  if (event->button == 1 && pixmap != NULL)
    draw_brush (widget, event->x, event->y);

  return TRUE;

static gboolean motion_notify_event( GtkWidget *widget,
                                     GdkEventMotion *event )
  int x, y;
  GdkModifierType state;

  if (event->is_hint)
    gdk_window_get_pointer (event->window, &x, &y, &state);
      x = event->x;
      y = event->y;
      state = event->state;
  if (state & GDK_BUTTON1_MASK && pixmap != NULL)
    draw_brush (widget, x, y);
  return TRUE;

void quit ()
  exit (0);

int main( int   argc, 
          char *argv[] )
  GtkWidget *window;
  GtkWidget *drawing_area;
  GtkWidget *vbox;

  GtkWidget *button;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_name (window, "Test Input");

  vbox = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_widget_show (vbox);

  g_signal_connect (G_OBJECT (window), "destroy",
                    G_CALLBACK (quit), NULL);

  /* Create the drawing area */

  drawing_area = gtk_drawing_area_new ();
  gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200);
  gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);

  gtk_widget_show (drawing_area);

  /* Signals used to handle backing pixmap */

  g_signal_connect (G_OBJECT (drawing_area), "expose_event",
		    G_CALLBACK (expose_event), NULL);
  g_signal_connect (G_OBJECT (drawing_area),"configure_event",
		    G_CALLBACK (configure_event), NULL);

  /* Event signals */

  g_signal_connect (G_OBJECT (drawing_area), "motion_notify_event",
		    G_CALLBACK (motion_notify_event), NULL);
  g_signal_connect (G_OBJECT (drawing_area), "button_press_event",
		    G_CALLBACK (button_press_event), NULL);

  gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK

  /* .. And a quit button */
  button = gtk_button_new_with_label ("Quit");
  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

  g_signal_connect_swapped (G_OBJECT (button), "clicked",
			    G_CALLBACK (gtk_widget_destroy),
			    G_OBJECT (window));
  gtk_widget_show (button);

  gtk_widget_show (window);

  gtk_main ();

  return 0;

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