git.cworth.org Git - xoboot/blob - xoboot.c

   1 /* gcc -Wall -g $(pkg-config --cflags --libs gtk+-2.0 cairo) olpc-boot.c -o olpc-boot */
   2
   3 #include <gtk/gtk.h>
   4 #include <cairo.h>
   5
   6 typedef struct _state {
   7     GtkWidget *drawing_area;
   8     double progress;
   9 } state_t;
  10
  11 static gboolean
  12 xoboot_expose_event (GtkWidget      *widget,
  13                       GdkEventExpose *event,
  14                       gpointer        closure)
  15 {
  16     state_t *state = closure;
  17     cairo_t *cr;
  18
  19     cr = gdk_cairo_create (widget->window);
  20
  21     cairo_set_source_rgb (cr, state->progress, 0, 0);
  22     cairo_paint (cr);
  23
  24     cairo_destroy (cr);
  25
  26     return TRUE;
  27 }
  28
  29 static GtkWidget *
  30 create_window (state_t *state)
  31 {
  32     GtkWidget *window;
  33     GtkWidget *drawing_area;
  34
  35     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  36     gtk_window_set_title (GTK_WINDOW (window), "OLPC Boot Animation Demo");
  37
  38     g_signal_connect (window, "destroy",
  39                       G_CALLBACK (gtk_main_quit), &window);
  40
  41     drawing_area = gtk_drawing_area_new ();
  42
  43     /* We want to force 640x480 to emulate the OLPC display */
  44     gtk_widget_set_size_request (drawing_area, 640, 480);
  45
  46     gtk_container_add (GTK_CONTAINER (window), drawing_area);
  47
  48     g_signal_connect (drawing_area, "expose_event",
  49                       G_CALLBACK (xoboot_expose_event), state);
  50
  51     return drawing_area;
  52 }
  53
  54 static gint
  55 timeout_callback (gpointer closure)
  56 {
  57     state_t *state = closure;
  58
  59     state->progress += 0.01;
  60     if (state->progress > 1.0)
  61         state->progress = 1.0;
  62     else
  63         gtk_widget_queue_draw (state->drawing_area);
  64
  65     return TRUE;
  66 }
  67
  68 int
  69 main (int argc, char *argv[])
  70 {
  71     state_t state;
  72
  73     gtk_init (&argc, &argv);
  74
  75     state.drawing_area = create_window (&state);
  76     state.progress = 0.0;
  77
  78     gtk_widget_show_all (gtk_widget_get_toplevel (state.drawing_area));
  79
  80     g_timeout_add (100, timeout_callback, &state);
  81
  82     gtk_main ();
  83
  84     return 0;
  85 }