Reset outline_grow value for root canvas while rendering.

Allow to pass global outline_grow value via RendDesc while rendering,
just for future.

synfig-core/src/synfig/renddesc.h

@@ -113,6 +113,8 @@ class RendDesc
 	Time time_begin, time_end;
 	//! Transformation matrix which should be applied for each primitive before rendering
 	Matrix transformation_matrix;
+	//! Root outline grow value
+	Real outline_grow;
 
 public:
 	//! Anti alias filers types. Seems never implemented
@@ -143,6 +145,7 @@ class RendDesc
 		frame_rate	(24),
 		time_begin	(0),
 		time_end	(0),
+		outline_grow(0),
 		AntialiasFilter(ANTIALIAS_UNIFORM)
 	{ }
 
@@ -357,6 +360,9 @@ class RendDesc
 			get_tl()[0], get_tl()[1], 1.0 );
 	}
 
+	Real get_outline_grow() const { return outline_grow; }
+	void set_outline_grow(Real x) { outline_grow = x; }
+
 };	// END of class RendDesc
 
 //! This operator allows the combining of RendDesc::Lock flags using the '|' operator

synfig-core/src/synfig/target_scanline.cpp

@@ -174,6 +174,7 @@ synfig::Target_Scanline::render(ProgressCallback *cb)
 			// Set the time that we wish to render
 			if(!get_avoid_time_sync() || canvas->get_time()!=t)
 				canvas->set_time(t);
+			canvas->set_outline_grow(desc.get_outline_grow());
 
 	#ifdef SYNFIG_OPTIMIZE_LAYER_TREE
 			Canvas::Handle op_canvas;
@@ -330,6 +331,7 @@ synfig::Target_Scanline::render(ProgressCallback *cb)
 		// Set the time that we wish to render
 		if(!get_avoid_time_sync() || canvas->get_time()!=t)
 			canvas->set_time(t);
+		canvas->set_outline_grow(desc.get_outline_grow());
 		Context context;
 
 #ifdef SYNFIG_OPTIMIZE_LAYER_TREE

synfig-core/src/synfig/target_tile.cpp

@@ -406,6 +406,7 @@ synfig::Target_Tile::render(ProgressCallback *cb)
 				//if(!get_avoid_time_sync() || canvas->get_time()!=t)
 				// Why the above line was commented here and not in TargetScaline?
 					canvas->set_time(t);
+				canvas->set_outline_grow(desc.get_outline_grow());
 
 	#ifdef SYNFIG_OPTIMIZE_LAYER_TREE
 				Canvas::Handle op_canvas;
@@ -438,6 +439,7 @@ synfig::Target_Tile::render(ProgressCallback *cb)
 			// Set the time that we wish to render
 			//if(!get_avoid_time_sync() || canvas->get_time()!=t)
 				canvas->set_time(t);
+			canvas->set_outline_grow(desc.get_outline_grow());
 
 			//synfig::info("2time_set_to %s",t.get_string().c_str());