examples/geglbuffer-clock.c

   1 #include <stdlib.h>
   2 #include <gegl.h>
   3 #include <glib/gprintf.h>
   4
   5 #include <sys/time.h>
   6 #include <time.h>
   7
   8 gint
   9 main (gint    argc,
  10       gchar **argv)
  11 {
  12   GeglNode   *gegl;   /* the gegl graph we're using as a node factor */
  13   GeglBuffer *buffer;
  14   GeglNode   *display,
  15              *text,
  16              *layer,
  17              *crop,
  18              *shift,
  19              *blank;
  20
  21   if (argv[1]==NULL)
  22     {
  23       g_print ("\nUsage: %s <GeglBuffer>\n"
  24                "\n"
  25                "Continously writes a timestamp to 0,0 in the buffer\n", argv[0]);
  26       exit (-1);
  27     }
  28
  29   gegl_init (&argc, &argv);  /* initialize the GEGL library */
  30
  31   gegl = gegl_node_new ();
  32
  33
  34   buffer = gegl_buffer_open (argv[1]);
  35
  36   blank      = gegl_node_new_child (gegl,
  37                                     "operation", "gegl:color",
  38                                     "value", gegl_color_new ("rgba(0.0,0.0,0.0,0.4)"),
  39                                     NULL);
  40
  41   crop       = gegl_node_new_child (gegl,
  42                                     "operation", "gegl:crop",
  43                                     "x", 0.0,
  44                                     "y", 0.0,
  45                                     "width", 260.0,
  46                                     "height", 22.0,
  47                                     NULL);
  48
  49   layer      = gegl_node_new_child (gegl,
  50                                     "operation", "gegl:layer",
  51                                     NULL);
  52
  53   shift      = gegl_node_new_child (gegl,
  54                                     "operation", "gegl:translate",
  55                                     "x", 0.0,
  56                                     "y", 0.0,
  57                                     NULL);
  58
  59   text       = gegl_node_new_child (gegl,
  60                                    "operation", "gegl:text",
  61                                    "size", 20.0,
  62                                    "color", gegl_color_new ("rgb(1.0,1.0,1.0)"),
  63                                    NULL);
  64   display    = gegl_node_new_child (gegl,
  65                                     "operation", "gegl:write-buffer",
  66                                     "buffer", buffer,
  67                                     NULL);
  68
  69   gegl_node_link_many (blank, crop, layer, shift, display, NULL);
  70   gegl_node_connect (text, "output", layer, "aux");
  71
  72   /* request that the save node is processed, all dependencies will
  73    * be processed as well
  74    */
  75   {
  76     gint frame;
  77     gint frames = 1024;
  78
  79     for (frame=0; frame<frames; frame++)
  80       {
  81         struct timeval tv;
  82
  83         gettimeofday(&tv, NULL);
  84         gegl_node_set (text, "string", ctime((void*)&tv), NULL);
  85         gegl_node_process (display);
  86         g_usleep (1000000);
  87       }
  88   }
  89   /* free resources globally used by GEGL */
  90   gegl_exit ();
  91
  92   return 0;
  93 }