You should subclass Gtk::DrawingArea
and implement at least:
virtual bool on_configure_event(GdkEventConfigure *event);
virtual bool on_expose_event(GdkEventExpose *event);
some steps:
1. calculate the image offsets, scale, etc.
2. with the info in (1), render the pixbuf to the offscreen pixmap like so:
pixmap->draw_pixbuf(..., pixbuf, ...);
3. shows the contents of pixmap in on_expose_event() function:
get_window()->draw_drawable
(
get_style()->get_fg_gc(get_state()),
pixmap,
event->area.x, event->area.y,
event->area.x, event->area.y,
event->area.width, event->area.height
);
Best regards,
smso
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