两种方法为gtk_window画背景图片

如果背景图片为透明背景的png,则可以实现非规则窗口。
详细看以下的两种方法：

#include

int main(int argc, char *argv[])
{
    GtkWidget *window = NULL;
    GdkPixbuf *pixbuf = NULL;
    GdkPixmap *pixmap = NULL;
    GdkBitmap *bitmap = NULL;
    GtkWidget *fixed = NULL;
    
    gtk_init(&argc,&argv);
   
    /* Create the window */
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"ZQButton  Demo");
    gtk_widget_set_events(window, GDK_SCROLL_MASK);
    gtk_widget_set_app_paintable(window,TRUE);
    gtk_widget_realize (window);
    //gtk_window_fullscreen(GTK_WINDOW(window));
    gtk_widget_set_size_request(window, 800, 600);
    g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (gtk_main_quit), NULL);
   
    pixbuf = gdk_pixbuf_new_from_file ("./test.png",NULL);
    gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, &bitmap, 128);
    gtk_widget_shape_combine_mask(window, bitmap, 0, 0);
   
#if 0
    GtkStyle *style = gtk_style_copy(window->style);
    if(style->bg_pixmap[GTK_STATE_NORMAL])
        g_object_unref(style->bg_pixmap[GTK_STATE_NORMAL]);
    style->bg_pixmap[GTK_STATE_NORMAL] = g_object_ref(pixmap);
    gtk_widget_set_style(window, style);
#else
    fixed = gtk_fixed_new();
    gtk_container_add (GTK_CONTAINER(window), fixed);
    pixbuf = gdk_pixbuf_new_from_file ("./test.png",NULL);
    pixmap = gdk_pixmap_new (fixed->window, gdk_pixbuf_get_width(pixbuf), gdk_pixbuf_get_height(pixbuf), -1);
    gdk_pixbuf_render_to_drawable(pixbuf, pixmap,
                fixed->style->fg_gc[GTK_STATE_NORMAL],
                0,0,0,0,
                gdk_pixbuf_get_width(pixbuf),
                gdk_pixbuf_get_height(pixbuf),
                GDK_RGB_DITHER_NORMAL,0,0);
    g_object_unref(pixbuf);
    gdk_window_set_back_pixmap (fixed->window, pixmap, FALSE);
    gtk_widget_show(fixed);
#endif
   
    gtk_widget_show(window);
    gtk_main();
    return FALSE;
}