Pileus Git - ~andy/gtk/blob - demos/testpixbuf-drawable.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3
   4 int
   5 close_app (GtkWidget *widget, gpointer data)
   6 {
   7    gtk_main_quit ();
   8    return TRUE;
   9 }
  10
  11 int
  12 expose_cb (GtkWidget *drawing_area, GdkEventExpose *evt, gpointer data)
  13 {
  14    GdkPixbuf *pixbuf;
  15
  16    pixbuf = (GdkPixbuf *) g_object_get_data (G_OBJECT (drawing_area), "pixbuf");
  17    if (gdk_pixbuf_get_has_alpha (pixbuf))
  18    {
  19       gdk_draw_rgb_32_image (drawing_area->window,
  20                              drawing_area->style->black_gc,
  21                              evt->area.x, evt->area.y,
  22                              evt->area.width,
  23                              evt->area.height,
  24                              GDK_RGB_DITHER_MAX,
  25                              gdk_pixbuf_get_pixels (pixbuf) +
  26                              (evt->area.y * gdk_pixbuf_get_rowstride (pixbuf)) +
  27                              (evt->area.x * gdk_pixbuf_get_n_channels (pixbuf)),
  28                              gdk_pixbuf_get_rowstride (pixbuf));
  29    }
  30    else
  31    {
  32       gdk_draw_rgb_image (drawing_area->window,
  33                           drawing_area->style->black_gc,
  34                           evt->area.x, evt->area.y,
  35                           evt->area.width,
  36                           evt->area.height,
  37                           GDK_RGB_DITHER_NORMAL,
  38                           gdk_pixbuf_get_pixels (pixbuf) +
  39                           (evt->area.y * gdk_pixbuf_get_rowstride (pixbuf)) +
  40                           (evt->area.x * gdk_pixbuf_get_n_channels (pixbuf)),
  41                           gdk_pixbuf_get_rowstride (pixbuf));
  42    }
  43    return FALSE;
  44 }
  45
  46 int
  47 configure_cb (GtkWidget *drawing_area, GdkEventConfigure *evt, gpointer data)
  48 {
  49    GdkPixbuf *pixbuf;
  50
  51    pixbuf = (GdkPixbuf *) g_object_get_data (G_OBJECT (drawing_area), "pixbuf");
  52
  53    g_print ("X:%d Y:%d\n", evt->width, evt->height);
  54    if (evt->width != gdk_pixbuf_get_width (pixbuf) || evt->height != gdk_pixbuf_get_height (pixbuf))
  55    {
  56       GdkWindow *root;
  57       GdkPixbuf *new_pixbuf;
  58
  59       root = gdk_get_default_root_window ();
  60       new_pixbuf = gdk_pixbuf_get_from_drawable (NULL, root, NULL,
  61                                                  0, 0, 0, 0, evt->width, evt->height);
  62       g_object_set_data (G_OBJECT (drawing_area), "pixbuf", new_pixbuf);
  63       g_object_unref (pixbuf);
  64    }
  65
  66    return FALSE;
  67 }
  68
  69 extern void pixbuf_init ();
  70
  71 int
  72 main (int argc, char **argv)
  73 {
  74    GdkWindow     *root;
  75    GtkWidget     *window;
  76    GtkWidget     *vbox;
  77    GtkWidget     *drawing_area;
  78    GdkPixbuf     *pixbuf;
  79
  80    pixbuf_init ();
  81
  82    gtk_init (&argc, &argv);
  83    gdk_rgb_set_verbose (TRUE);
  84
  85    gtk_widget_set_default_colormap (gdk_rgb_get_colormap ());
  86
  87    root = gdk_get_default_root_window ();
  88    pixbuf = gdk_pixbuf_get_from_drawable (NULL, root, NULL,
  89                                           0, 0, 0, 0, 150, 160);
  90
  91    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  92    g_signal_connect (window, "delete_event",
  93                      G_CALLBACK (close_app), NULL);
  94    g_signal_connect (window, "destroy",
  95                      G_CALLBACK (close_app), NULL);
  96
  97    vbox = gtk_vbox_new (FALSE, 0);
  98    gtk_container_add (GTK_CONTAINER (window), vbox);
  99
 100    drawing_area = gtk_drawing_area_new ();
 101    gtk_widget_set_size_request (GTK_WIDGET (drawing_area),
 102                                 gdk_pixbuf_get_width (pixbuf),
 103                                 gdk_pixbuf_get_height (pixbuf));
 104    g_signal_connect (drawing_area, "expose_event",
 105                      G_CALLBACK (expose_cb), NULL);
 106
 107    g_signal_connect (drawing_area, "configure_event",
 108                      G_CALLBACK (configure_cb), NULL);
 109    g_object_set_data (G_OBJECT (drawing_area), "pixbuf", pixbuf);
 110    gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
 111
 112    gtk_widget_show_all (window);
 113    gtk_main ();
 114    return 0;
 115 }