fix crash when copy'ing latent plugins

[ardour.git] / libs / canvas / poly_item.cc

diff --git a/libs/canvas/poly_item.cc b/libs/canvas/poly_item.cc
index 88b9af78781cbc28a4242287daac5a9ab2e240e0..855140856eb0f3ccdb60cbcd0d2f93870d67d22c 100644 (file)
--- a/libs/canvas/poly_item.cc
+++ b/libs/canvas/poly_item.cc
@@ -27,22 +27,25 @@
 using namespace std;
 using namespace ArdourCanvas;
 
-PolyItem::PolyItem (Group* parent)
-       : Item (parent)
-       , Outline (parent)
+PolyItem::PolyItem (Canvas* c)
+       : Item (c)
 {
+}
 
+PolyItem::PolyItem (Item* parent)
+       : Item (parent)
+{
 }
 
 void
 PolyItem::compute_bounding_box () const
 {
-       
+
        if (!_points.empty()) {
 
                Rect bbox;
                Points::const_iterator i = _points.begin();
-               
+
                bbox.x0 = bbox.x1 = i->x;
                bbox.y0 = bbox.y1 = i->y;
 
@@ -56,13 +59,13 @@ PolyItem::compute_bounding_box () const
                        ++i;
                }
 
-               _bounding_box = bbox.expand (_outline_width);
+               _bounding_box = bbox.expand (_outline_width + 0.5);
+
 
-               
        } else {
                _bounding_box = boost::optional<Rect> ();
        }
-       
+
        _bounding_box_dirty = false;
 }
 
@@ -110,14 +113,14 @@ PolyItem::render_curve (Rect const & area, Cairo::RefPtr<Cairo::Context> context
                Duple c2 = item_to_window (Duple (cp2->x, cp2->y));
 
                c = item_to_window (Duple (p->x, p->y));
-               
-               context->curve_to (c1.x + pixel_adjust, 
-                                  c1.y + pixel_adjust, 
-                                  c2.x + pixel_adjust, 
-                                  c2.y + pixel_adjust, 
-                                  c.x + pixel_adjust, 
+
+               context->curve_to (c1.x + pixel_adjust,
+                                  c1.y + pixel_adjust,
+                                  c2.x + pixel_adjust,
+                                  c2.y + pixel_adjust,
+                                  c.x + pixel_adjust,
                                   c.y + pixel_adjust);
-               
+
                ++cp1;
                ++cp2;
                ++p;
@@ -127,12 +130,15 @@ PolyItem::render_curve (Rect const & area, Cairo::RefPtr<Cairo::Context> context
 void
 PolyItem::set (Points const & points)
 {
-       begin_change ();
-       
-       _points = points;
-       
-       _bounding_box_dirty = true;
-       end_change ();
+       if (_points != points) {
+
+               begin_change ();
+
+               _points = points;
+
+               _bounding_box_dirty = true;
+               end_change ();
+       }
 }
 
 Points const &