From 92b14683ec8e9a6702bf1e92c661283139871b8c Mon Sep 17 00:00:00 2001
From: Ivan Mahonin <bh@icystar.com>
Date: Jun 20 2018 11:46:49 +0000
Subject: Fix visual artefacts


---

diff --git a/synfig-core/src/synfig/rendering/common/task/taskcontour.h b/synfig-core/src/synfig/rendering/common/task/taskcontour.h
index 081e85c..2988950 100644
--- a/synfig-core/src/synfig/rendering/common/task/taskcontour.h
+++ b/synfig-core/src/synfig/rendering/common/task/taskcontour.h
@@ -55,7 +55,7 @@ public:
 	bool allow_antialias;
 	Holder<TransformationAffine> transformation;
 
-	TaskContour(): detail(0.5), allow_antialias(true) { }
+	TaskContour(): detail(1.0), allow_antialias(true) { }
 
 	virtual Rect calc_bounds() const;
 
diff --git a/synfig-core/src/synfig/rendering/primitive/polyspan.cpp b/synfig-core/src/synfig/rendering/primitive/polyspan.cpp
index 960158f..4067146 100644
--- a/synfig-core/src/synfig/rendering/primitive/polyspan.cpp
+++ b/synfig-core/src/synfig/rendering/primitive/polyspan.cpp
@@ -181,13 +181,21 @@ Polyspan::line_to(Real x, Real y, Real detail)
 	Real dx = x - cur_x;
 	Real dy = y - cur_y;
 
-	if (detail && fabs(dx) < detail && fabs(dy) < detail)
-	{
-		cur_line_x = x;
-		cur_line_y = y;
-		flags |= NotFinishedLine;
-		return;
+	if (detail) {
+		if (fabs(dx) < detail && fabs(dy) < detail) {
+			cur_line_x = x;
+			cur_line_y = y;
+			flags |= NotFinishedLine;
+			return;
+		}
+
+		if (flags & NotFinishedLine) {
+			line_to(cur_line_x, cur_line_y, 0.0);
+			line_to(x, y, detail);
+			return;
+		}
 	}
+
 	flags &= ~NotFinishedLine;
 
 	Real n[4] = {0,0,0,0};
diff --git a/synfig-core/src/synfig/rendering/primitive/polyspan.h b/synfig-core/src/synfig/rendering/primitive/polyspan.h
index 4b80b39..b22b701 100644
--- a/synfig-core/src/synfig/rendering/primitive/polyspan.h
+++ b/synfig-core/src/synfig/rendering/primitive/polyspan.h
@@ -166,9 +166,9 @@ public:
 	void move_to(Real x, Real y);
 
 	//primitive_to functions
-	void line_to(Real x, Real y, Real detail = 0.5);
-	void conic_to(Real x, Real y, Real x1, Real y1, Real detail = 0.5);
-	void cubic_to(Real x, Real y, Real x1, Real y1, Real x2, Real y2, Real detail = 0.5);
+	void line_to(Real x, Real y, Real detail = 1.0);
+	void conic_to(Real x, Real y, Real x1, Real y1, Real detail = 1.0);
+	void cubic_to(Real x, Real y, Real x1, Real y1, Real x2, Real y2, Real detail = 1.0);
 
 	void draw_scanline(int y, Real x1, Real y1, Real x2, Real y2);
 	void draw_line(Real x1, Real y1, Real x2, Real y2);