static void
sp_canvas_arena_viewbox_changed (SPCanvasItem *item, Geom::IntRect const &new_area)
{
SPCanvasArena *arena = SP_CANVAS_ARENA(item);
// make the cache limit larger than screen to facilitate smooth scrolling
Geom::IntRect expanded = new_area;
Geom::IntPoint expansion(new_area.width()/2, new_area.height()/2);
expanded.expandBy(expansion);
arena->drawing.setCacheLimit(expanded);
}
cairo_rectangle_int_t
DrawingCache::_convertRect(Geom::IntRect const &area)
{
cairo_rectangle_int_t ret;
ret.x = area.left();
ret.y = area.top();
ret.width = area.width();
ret.height = area.height();
return ret;
}