void FilterTile::area_enlarge(Geom::IntRect &area, Geom::Affine const &trans)
{
// We need to enlarge enough to get tile source... we don't the area of the source tile in this
// function so we guess. This is VERY inefficient.
Geom::Point enlarge(200, 200);
enlarge *= trans;
area.expandBy( enlarge[Geom::X] < 100 ? 100: enlarge[Geom::X] );
}
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);
}