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

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