4 files changed, 37 insertions, 3 deletions
diff --git a/servers/visual/rasterizer.h b/servers/visual/rasterizer.h
index 869ab83d9a..2abe33449e 100644
--- a/servers/visual/rasterizer.h
+++ b/servers/visual/rasterizer.h
@@ -769,6 +769,12 @@ public:
 		mutable Rect2 rect;
 		CanvasItem*next;
 		CanvasItemMaterial* material;
+		struct CopyBackBuffer {
+			Rect2 rect;
+			Rect2 screen_rect;
+			bool full;
+		};
+		CopyBackBuffer *copy_back_buffer;
 
 
 		float final_opacity;
@@ -904,8 +910,8 @@ public:
 		}
 
 		void clear() { for (int i=0;i<commands.size();i++) memdelete( commands[i] ); commands.clear(); clip=false; rect_dirty=true; final_clip_owner=NULL;  material_owner=NULL;}
-		CanvasItem() { light_mask=1; vp_render=NULL; next=NULL; final_clip_owner=NULL; clip=false; final_opacity=1;  blend_mode=VS::MATERIAL_BLEND_MODE_MIX; visible=true; rect_dirty=true; custom_rect=false; ontop=true; material_owner=NULL; material=NULL; }
-		virtual ~CanvasItem() { clear(); }
+		CanvasItem() { light_mask=1; vp_render=NULL; next=NULL; final_clip_owner=NULL; clip=false; final_opacity=1;  blend_mode=VS::MATERIAL_BLEND_MODE_MIX; visible=true; rect_dirty=true; custom_rect=false; ontop=true; material_owner=NULL; material=NULL; copy_back_buffer=NULL; }
+		virtual ~CanvasItem() { clear(); if (copy_back_buffer) memdelete(copy_back_buffer); }
 	};
 
 
diff --git a/servers/visual/visual_server_raster.cpp b/servers/visual/visual_server_raster.cpp
index 2c81dfbb30..50c8e72398 100644
--- a/servers/visual/visual_server_raster.cpp
+++ b/servers/visual/visual_server_raster.cpp
@@ -3765,6 +3765,27 @@ void VisualServerRaster::canvas_item_set_z_as_relative_to_parent(RID p_item, boo
 
 }
 
+void VisualServerRaster::canvas_item_set_copy_to_backbuffer(RID p_item, bool p_enable, const Rect2& p_rect) {
+
+	VS_CHANGED;
+	CanvasItem *canvas_item = canvas_item_owner.get( p_item );
+	ERR_FAIL_COND(!canvas_item);
+	if (bool(canvas_item->copy_back_buffer!=NULL) !=p_enable) {
+		if (p_enable) {
+			canvas_item->copy_back_buffer = memnew( Rasterizer::CanvasItem::CopyBackBuffer );
+		} else {
+			memdelete(canvas_item->copy_back_buffer);
+			canvas_item->copy_back_buffer=NULL;
+		}
+	}
+
+	if (p_enable) {
+		canvas_item->copy_back_buffer->rect=p_rect;
+		canvas_item->copy_back_buffer->full=p_rect==Rect2();
+	}
+
+}
+
 void VisualServerRaster::canvas_item_set_use_parent_material(RID p_item, bool p_enable) {
 
 	VS_CHANGED;
@@ -6766,8 +6787,12 @@ void VisualServerRaster::_render_canvas_item(CanvasItem *p_canvas_item,const Mat
 		_render_canvas_item(child_items[i],xform,p_clip_rect,opacity,p_z,z_list,z_last_list,(CanvasItem*)ci->final_clip_owner,p_material_owner);
 	}
 
+	if (ci->copy_back_buffer) {
+
+		ci->copy_back_buffer->screen_rect = xform.xform(ci->copy_back_buffer->rect).clip(p_clip_rect);
+	}
 
-	if ((!ci->commands.empty() && p_clip_rect.intersects(global_rect)) || ci->vp_render) {
+	if ((!ci->commands.empty() && p_clip_rect.intersects(global_rect)) || ci->vp_render || ci->copy_back_buffer) {
 		//something to draw?
 		ci->final_transform=xform;
 		ci->final_opacity=opacity * ci->self_opacity;
diff --git a/servers/visual/visual_server_raster.h b/servers/visual/visual_server_raster.h
index 1622871d45..5c0d48645e 100644
--- a/servers/visual/visual_server_raster.h
+++ b/servers/visual/visual_server_raster.h
@@ -1149,6 +1149,7 @@ public:
 	virtual void canvas_item_set_sort_children_by_y(RID p_item, bool p_enable);
 	virtual void canvas_item_set_z(RID p_item, int p_z);
 	virtual void canvas_item_set_z_as_relative_to_parent(RID p_item, bool p_enable);
+	virtual void canvas_item_set_copy_to_backbuffer(RID p_item, bool p_enable,const Rect2& p_rect);
 
 	virtual void canvas_item_set_material(RID p_item, RID p_material);
 	virtual void canvas_item_set_use_parent_material(RID p_item, bool p_enable);
diff --git a/servers/visual/visual_server_wrap_mt.h b/servers/visual/visual_server_wrap_mt.h
index 4022503697..6848075824 100644
--- a/servers/visual/visual_server_wrap_mt.h
+++ b/servers/visual/visual_server_wrap_mt.h
@@ -1138,6 +1138,8 @@ public:
 	FUNC2(canvas_item_set_sort_children_by_y,RID,bool);
 	FUNC2(canvas_item_set_z,RID,int);
 	FUNC2(canvas_item_set_z_as_relative_to_parent,RID,bool);
+	FUNC3(canvas_item_set_copy_to_backbuffer,RID,bool,const Rect2&);
+
 
 	FUNC2(canvas_item_set_material,RID, RID );