From c8788620f42bcb01d7a2fb06ff9465981ce5ec8d Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Tue, 1 May 2018 15:58:57 -0400
Subject: [PATCH] ...

---
 MagickCore/draw.c | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/MagickCore/draw.c b/MagickCore/draw.c
index a3460ba29..aa8ecda86 100644
--- a/MagickCore/draw.c
+++ b/MagickCore/draw.c
@@ -1808,7 +1808,7 @@ static inline MagickBooleanType IsPoint(const char *point)
   return((fabs(value) < DrawEpsilon) && (p == point) ? MagickFalse : MagickTrue);
 }
 
-static size_t ReckonEllipseCoordinates(const PointInfo stop,
+static size_t ReckonEllipseCoordinates(const PointInfo radii,
   const PointInfo degrees)
 {
   double
@@ -1822,7 +1822,9 @@ static size_t ReckonEllipseCoordinates(const PointInfo stop,
   /*
     Ellipses are just short segmented polys.
   */
-  delta=2.0*PerceptibleReciprocal(MagickMax(stop.x,stop.y));
+  if ((fabs(radii.x) < MagickEpsilon) || (fabs(radii.y) < MagickEpsilon))
+    return(0);
+  delta=2.0*PerceptibleReciprocal(MagickMax(radii.x,radii.y));
   step=MagickPI/8.0;
   if ((delta >= 0.0) && (delta < (MagickPI/8.0)))
     step=MagickPI/(4.0*(MagickPI*PerceptibleReciprocal(delta)/2.0));
@@ -5726,7 +5728,7 @@ static void TraceCircle(PrimitiveInfo *primitive_info,const PointInfo start,
 }
 
 static void TraceEllipse(PrimitiveInfo *primitive_info,const PointInfo start,
-  const PointInfo stop,const PointInfo degrees)
+  const PointInfo radii,const PointInfo degrees)
 {
   double
     delta,
@@ -5746,7 +5748,10 @@ static void TraceEllipse(PrimitiveInfo *primitive_info,const PointInfo start,
   /*
     Ellipses are just short segmented polys.
   */
-  delta=2.0*PerceptibleReciprocal(MagickMax(stop.x,stop.y));
+  primitive_info->coordinates=0;
+  if ((fabs(radii.x) < MagickEpsilon) || (fabs(radii.y) < MagickEpsilon))
+    return;
+  delta=2.0*PerceptibleReciprocal(MagickMax(radii.x,radii.y));
   step=MagickPI/8.0;
   if ((delta >= 0.0) && (delta < (MagickPI/8.0)))
     step=MagickPI/(4.0*(MagickPI*PerceptibleReciprocal(delta)/2.0));
@@ -5757,13 +5762,13 @@ static void TraceEllipse(PrimitiveInfo *primitive_info,const PointInfo start,
   angle.y=DegreesToRadians(y);
   for (p=primitive_info; angle.x < angle.y; angle.x+=step)
   {
-    point.x=cos(fmod(angle.x,DegreesToRadians(360.0)))*stop.x+start.x;
-    point.y=sin(fmod(angle.x,DegreesToRadians(360.0)))*stop.y+start.y;
+    point.x=cos(fmod(angle.x,DegreesToRadians(360.0)))*radii.x+start.x;
+    point.y=sin(fmod(angle.x,DegreesToRadians(360.0)))*radii.y+start.y;
     TracePoint(p,point);
     p+=p->coordinates;
   }
-  point.x=cos(fmod(angle.y,DegreesToRadians(360.0)))*stop.x+start.x;
-  point.y=sin(fmod(angle.y,DegreesToRadians(360.0)))*stop.y+start.y;
+  point.x=cos(fmod(angle.y,DegreesToRadians(360.0)))*radii.x+start.x;
+  point.y=sin(fmod(angle.y,DegreesToRadians(360.0)))*radii.y+start.y;
   TracePoint(p,point);
   p+=p->coordinates;
   primitive_info->coordinates=(size_t) (p-primitive_info);
@@ -6266,6 +6271,12 @@ static void TraceRectangle(PrimitiveInfo *primitive_info,const PointInfo start,
   register ssize_t
     i;
 
+  if ((fabs(start.x-end.x) < DrawEpsilon) ||
+      (fabs(start.y-end.y) < DrawEpsilon))
+    {
+      primitive_info->coordinates=0;
+      return;
+    }
   p=primitive_info;
   TracePoint(p,start);
   p+=p->coordinates;
@@ -6303,9 +6314,14 @@ static void TraceRoundRectangle(PrimitiveInfo *primitive_info,
   register ssize_t
     i;
 
-  p=primitive_info;
   offset.x=fabs(end.x-start.x);
   offset.y=fabs(end.y-start.y);
+  if ((offset.x < DrawEpsilon) || (offset.y < DrawEpsilon))
+    {
+      primitive_info->coordinates=0;
+      return;
+    }
+  p=primitive_info;
   if (arc.x > (0.5*offset.x))
     arc.x=0.5*offset.x;
   if (arc.y > (0.5*offset.y))
-- 
2.40.0