Re: gdk_draw_drawable on a non-active widget window

["Vyacheslav D." <bordimida mail ru>]

On Tue, 16 Dec 2008 11:43:30 +0300, zaheer ahmad <zaheer mot gmail com>  
wrote:

> hi,
>
> iam trying to take the snapshot of a widget window in a pixmap using
> gdk_draw_drawable, however it seems to work only if the widget is active
> (visible on the screen).
>
> as i understand, this process involves a peek on to the x and that may  
> mean
> that the data for the inactive window may not be available.
>
> can somebody confirm on this and also if there is any other means to get
> access to pixmaps of inactive windows
>
> thanks,
> Zaheer

My suggestion:

void save_picture_to_file(GtkWidget *da, char *filename)
{
        GdkRectangle exposed_area;
        exposed_area.x = da->allocation.x;
        exposed_area.y = da->allocation.y;
        exposed_area.width = da->allocation.width;
        exposed_area.height = da->allocation.height;

        GdkPixmap *pixmap = gtk_widget_get_snapshot(da, &exposed_area);
        GdkColormap *cmap = gdk_colormap_get_system();
        GdkPixbuf *pixbuf = gdk_pixbuf_get_from_drawable(
                NULL,
                pixmap,
                cmap,
                0, 0,
                exposed_area.x,
                exposed_area.y,
                exposed_area.width,
                exposed_area.height);

        GError * error = NULL;

        gdk_pixbuf_save(pixbuf, filename, "png", &error, NULL);

        if (error)
        {
                printf("Error saving image: %s\n", error->message);
                g_error_free(error);
        }

        g_object_unref (pixbuf);
        gdk_pixmap_unref(pixmap);
        gdk_colormap_unref(cmap);
}


--
Vyacheslav D.