#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include <sys/time.h>

/* 

gcc test-gdk.c -o test-gdk `pkg-config --libs --cflags gtk+-2.0`

 */

#define VERSION "0.1"

static int      TotalCycles = 100;
static gboolean Verbose;

static unsigned long long
GetTimeInMillis(void)
{
  struct timeval  tp;

  gettimeofday(&tp, 0);
  return (unsigned long long)(tp.tv_sec * 1000) + (tp.tv_usec / 1000);
}


gboolean
nullexpose(GtkWidget      *darea,
       GdkEventExpose *event,
       gpointer        user_data)
{
  printf("null expose\n");
  return FALSE;

}

gboolean
expose(GtkWidget      *darea,
       GdkEventExpose *event,
       gpointer        user_data)
{
  int                i, x, y, width, height, rowstride, n_channels = 3, size;
  unsigned long long start_clock, finish_clock, diff_clock; 
  guchar            *pixels, *p;
  GdkPixbuf         *pixbuf = NULL;

  printf("expose\n");

  width  = darea->allocation.width;
  height = darea->allocation.height;

  start_clock = GetTimeInMillis(); 

  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
  rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  pixels    = gdk_pixbuf_get_pixels (pixbuf);

  for(y=0; y < height; y++)
    for(x=0; x < width; x++)
      {
	guchar b = 10 + x ;
	guchar g = y;   
	guchar r = x - y;
	
	p = pixels + y * rowstride + x * n_channels;

	p[0] = b; p[1] = g; p[2] = r;
      }

  finish_clock = GetTimeInMillis();

  if (Verbose)
    {
      printf("test-x: Surface ( %u X %u, %lu KB ) Created in %lli ms\n",
	     width, height, size / 1024, finish_clock - start_clock);
    }

  start_clock = GetTimeInMillis(); 

  for (i=0; i < TotalCycles; i++)
    {

      gdk_draw_pixbuf (GDK_DRAWABLE(darea->window),
		       NULL,
		       pixbuf,
		       0, 0, 0, 0,
		       -1,
		       -1,
		       GDK_RGB_DITHER_NONE, 0, 0);
     
      // gtk_widget_queue_draw_area(darea, 0, 0, width, height);

      /* Assume this flushes ? */
      gdk_display_sync(gdk_display_get_default());
      // gdk_display_flush(gdk_display_get_default());

    }

  finish_clock = GetTimeInMillis();
  diff_clock  = finish_clock - start_clock;
  size = width * height * 2; 	/* XXX Assumes 16bpp */

  printf("test-gtk: write speed: %lli KB/sec\n",
	 ( (unsigned long long)(size/1024) * 1000 * TotalCycles) / diff_clock);

  gtk_main_quit();
  return FALSE;
}

static void
usage(void)
{
  fprintf(stderr, 
	  "test-gdk " VERSION "\n"
	  "usage: test-gdk [--verbose] [--buffered] [--cycles <int>]\n");
  exit(1);
} 


int 
main(int argc, char **argv)
{
  gboolean Buffered = FALSE;
  GtkWidget *window = 0;
  GtkWidget *darea  = 0;
  
  int i;
  
  gtk_init(&argc, &argv);

  for (i = 1; i < argc; i++) {

    if (!strcmp ("--verbose", argv[i]) || !strcmp ("-v", argv[i])) {
      Verbose = TRUE;
      continue;
    }

    if (!strcmp ("--buffered", argv[i]) || !strcmp ("-b", argv[i])) {
      Buffered = TRUE;
      continue;
    }

    if (!strcmp ("--cycles", argv[i]))  {
      if (++i>=argc) usage ();
      TotalCycles = atoi(argv[i]);
      if (TotalCycles < 1) usage();
      continue;
    }

    usage();
  }
  

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  gtk_window_set_default_size(GTK_WINDOW(window),
			      gdk_screen_get_width(gdk_display_get_default_screen (gdk_display_get_default ())),
			      
			      gdk_screen_get_height(gdk_display_get_default_screen (gdk_display_get_default ())));
  
  // gtk_window_maximize(GTK_WINDOW(window)); /* fullscreen  */

  gtk_container_set_border_width(GTK_CONTAINER(window), 0);
  
  
  darea = gtk_drawing_area_new();
  
  gtk_widget_set_double_buffered (darea, Buffered);

  gtk_container_add(GTK_CONTAINER(window), darea);

  g_signal_connect(G_OBJECT(darea), "expose_event",
		   G_CALLBACK(expose), 0);

  gtk_widget_show_all(window);

  gtk_main();  

  return 0;
}