From 3ae9b262529ea9e276a1acc2f7ebdb393079c514 Mon Sep 17 00:00:00 2001
From: Alvin Penner <penner@vaxxine.com>
Date: Mon, 4 Apr 2016 19:05:14 -0400
Subject: avoid higher-order calculations if sbasis is cubic. (Bug 1559721)

Fixed bugs:
  - https://launchpad.net/bugs/1559721

(bzr r14762)
---
 src/2geom/sbasis-to-bezier.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/2geom')

diff --git a/src/2geom/sbasis-to-bezier.cpp b/src/2geom/sbasis-to-bezier.cpp
index 8a18cfd4a..64c07f35e 100644
--- a/src/2geom/sbasis-to-bezier.cpp
+++ b/src/2geom/sbasis-to-bezier.cpp
@@ -197,6 +197,8 @@ void sbasis_to_cubic_bezier (std::vector<Point> & bz, D2<SBasis> const& sb)
     }
 
     sbasis_to_bezier(bz, sb, 4);  // zeroth-order estimate
+    if ((sb[X].size() < 3) && (sb[Y].size() < 3))
+        return;  // cubic bezier estimate is exact
     Geom::ConvexHull bezhull(bz);
 
 //  calculate first derivatives of x and y wrt t
-- 
cgit v1.2.3