void rot1(GdkPixbuf *src, GdkPixbuf *dist, gint r, gfloat m)
{
  gint  w1, h1, w2, h2;
  gint  x1, y1, x2, y2;
  gint  px1, py1, px2, py2;
  gint  i, j;
  guint32  *ptr1, *ptr2;
  guchar   *ptr;

  w1 = gdk_pixbuf_get_width(src);
  h1 = gdk_pixbuf_get_height(src);
  w2 = gdk_pixbuf_get_width(dist);
  h2 = gdk_pixbuf_get_height(dist);
  px1 = w1 / 2;
  py1 = h1 / 2;
  px2 = w2 / 2;
  py2 = h2 / 2;

  r = 360 - r;

  ptr1 = (guint32*)gdk_pixbuf_get_pixels(src);
  for(j=0; j<h1; j++) {
    for(i=0; i<w1; i++) {
      x1 = i;
      y1 = j;
      x2 = ((x1 - px1) * cos(M_PI*2/360*r) + (y1 - py1) * sin(M_PI*2/360*r)) * m + px2;
      y2 = ((y1 - py1) * cos(M_PI*2/360*r) - ((x1 - px1) * sin(M_PI*2/360*r))) * m + py2;
      if ((x2 >= 0) && (x2 < w2) && (y2 >= 0) && (y2 < h2)) {
	ptr = gdk_pixbuf_get_pixels(dist) + gdk_pixbuf_get_rowstride(dist) * y2 + (x2 * 4);
	ptr2 = (guint32 *)ptr;
	*ptr2 = *ptr1;
      }
      ptr1++;
    }
  }
}