text: /*************************************************************************/
  /*  canvas_item.cpp                                                      */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                    http://www.godotengine.org                         */
  /*************************************************************************/
  /* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  #include "canvas_item.h"
  #include "servers/visual_server.h"
  #include "scene/main/viewport.h"
  #include "scene/main/canvas_layer.h"
  #include "message_queue.h"
  #include "scene/scene_string_names.h"
  #include "scene/resources/font.h"
  #include "scene/resources/texture.h"
  #include "scene/resources/style_box.h"
  #include "os/input.h"
  
  bool CanvasItemMaterial::_set(const StringName& p_name, const Variant& p_value) {
  
  	if (p_name==SceneStringNames::get_singleton()->shader_shader) {
  		set_shader(p_value);
  		return true;
  	} else {
  
  		if (shader.is_valid()) {
  
  
  			StringName pr = shader->remap_param(p_name);
  			if (!pr) {
  				String n = p_name;
  				if (n.find("param/")==0) { //backwards compatibility
  					pr = n.substr(6,n.length());
  				}
  			}
  			if (pr) {
  				VisualServer::get_singleton()->material_set_param(_get_material(),pr,p_value);
  				return true;
  			}
  		}
  	}
  
  	return false;
  }
  
  bool CanvasItemMaterial::_get(const StringName& p_name,Variant &r_ret) const {
  
  
  	if (p_name==SceneStringNames::get_singleton()->shader_shader) {
  
  		r_ret=get_shader();
  		return true;
  
  	} else {
  
  		if (shader.is_valid()) {
  
  			StringName pr = shader->remap_param(p_name);
  			if (pr) {
  				r_ret=VisualServer::get_singleton()->material_get_param(_get_material(),pr);
  				return true;
  			}
  		}
  
  	}
  
  
  	return false;
  }
  
  
  void CanvasItemMaterial::_get_property_list( List<PropertyInfo> *p_list) const {
  
  	p_list->push_back( PropertyInfo( Variant::OBJECT, "shader/shader", PROPERTY_HINT_RESOURCE_TYPE,"CanvasItemShader,CanvasItemShaderGraph" ) );
  
  	if (!shader.is_null()) {
  
  		shader->get_param_list(p_list);
  	}
  
  }
  
  void CanvasItemMaterial::set_shader(const Ref<Shader>& p_shader) {
  
  	ERR_FAIL_COND(p_shader.is_valid() && p_shader->get_mode()!=Shader::MODE_CANVAS_ITEM);
  
  	shader=p_shader;
  
  	RID rid;
  	if (shader.is_valid())
  		rid=shader->get_rid();
  
  	VS::get_singleton()->material_set_shader(_get_material(),rid);
  	_change_notify(); //properties for shader exposed
  	emit_changed();
  }
  
  Ref<Shader> CanvasItemMaterial::get_shader() const{
  
  	return shader;
  }
  
  void CanvasItemMaterial::set_shader_param(const StringName& p_param,const Variant& p_value){
  
  	VS::get_singleton()->material_set_param(_get_material(),p_param,p_value);
  }
  
  Variant CanvasItemMaterial::get_shader_param(const StringName& p_param) const{
  
  	return VS::get_singleton()->material_get_param(_get_material(),p_param);
  }
  
  
  
  void CanvasItemMaterial::_bind_methods() {
  
  	ClassDB::bind_method(_MD("set_shader","shader:Shader"),&CanvasItemMaterial::set_shader);
  	ClassDB::bind_method(_MD("get_shader:Shader"),&CanvasItemMaterial::get_shader);
  	ClassDB::bind_method(_MD("set_shader_param","param","value"),&CanvasItemMaterial::set_shader_param);
  	ClassDB::bind_method(_MD("get_shader_param","param"),&CanvasItemMaterial::get_shader_param);
  
  
  
  }
  
  void CanvasItemMaterial::get_argument_options(const StringName& p_function,int p_idx,List<String>*r_options) const {
  
  	String f = p_function.operator String();
  	if ((f=="get_shader_param" || f=="set_shader_param") && p_idx==0) {
  
  		if (shader.is_valid()) {
  			List<PropertyInfo> pl;
  			shader->get_param_list(&pl);
  			for (List<PropertyInfo>::Element *E=pl.front();E;E=E->next()) {
  				r_options->push_back("\""+E->get().name.replace_first("shader_param/","")+"\"");
  			}
  		}
  	}
  	Resource::get_argument_options(p_function,p_idx,r_options);
  }
  
  CanvasItemMaterial::CanvasItemMaterial() {
  
  
  
  }
  
  CanvasItemMaterial::~CanvasItemMaterial(){
  
  
  }
  
  
  
  
  
  
  
  
  ///////////////////////////////////////////////////////////////////
  
  
  
  bool CanvasItem::is_visible() const {
  
  	if (!is_inside_tree())
  		return false;
  
  	const CanvasItem *p=this;
  
  	while(p) {
  		if (p->hidden)
  			return false;
  		p=p->get_parent_item();
  	}
  
  
  	return true;
  }
  
  bool CanvasItem::is_hidden() const {
  
  	/*if (!is_inside_scene())
  		return false;*/
  
  	return hidden;
  }
  
  void CanvasItem::_propagate_visibility_changed(bool p_visible) {
  
  	notification(NOTIFICATION_VISIBILITY_CHANGED);
  
  	if (p_visible)
  		update(); //todo optimize
  	else
  		emit_signal(SceneStringNames::get_singleton()->hide);
  	_block();
  
  	for(int i=0;i<get_child_count();i++) {
  
  		CanvasItem *c=get_child(i)->cast_to<CanvasItem>();
  
  		if (c && !c->hidden) //should the toplevels stop propagation? i think so but..
  			c->_propagate_visibility_changed(p_visible);
  	}
  
  	_unblock();
  
  }
  
  void CanvasItem::show() {
  
  	if (!hidden)
  		return;
  
  	hidden=false;
  	VisualServer::get_singleton()->canvas_item_set_visible(canvas_item,true);
  
  	if (!is_inside_tree())
  		return;
  
  	_propagate_visibility_changed(true);
  	_change_notify("visibility/visible");
  }
  
  
  void CanvasItem::hide() {
  
  	if (hidden)
  		return;
  
  	hidden=true;
  	VisualServer::get_singleton()->canvas_item_set_visible(canvas_item,false);
  
  	if (!is_inside_tree())
  		return;
  
  	_propagate_visibility_changed(false);
  	_change_notify("visibility/visible");
  }
  
  void CanvasItem::set_hidden(bool p_hidden) {
  
  	if (hidden == p_hidden) {
  		return;
  	}
  
  	_set_visible_(!p_hidden);
  }
  
  
  Variant CanvasItem::edit_get_state() const {
  
  
  	return Variant();
  }
  void CanvasItem::edit_set_state(const Variant& p_state) {
  
  
  }
  
  void CanvasItem::edit_set_rect(const Rect2& p_edit_rect) {
  
  	//used by editors, implement at will
  }
  
  void CanvasItem::edit_rotate(float p_rot) {
  
  
  }
  
  Size2 CanvasItem::edit_get_minimum_size() const {
  
  	return Size2(-1,-1); //no limit
  }
  
  void CanvasItem::_update_callback() {
  
  
  
  	if (!is_inside_tree()) {
  		pending_update=false;
  		return;
  	}
  
  	VisualServer::get_singleton()->canvas_item_clear(get_canvas_item());
  	//todo updating = true - only allow drawing here
  	if (is_visible()) { //todo optimize this!!
  		if (first_draw) {
  			notification(NOTIFICATION_VISIBILITY_CHANGED);
  			first_draw=false;
  		}
  		drawing=true;
  		notification(NOTIFICATION_DRAW);
  		emit_signal(SceneStringNames::get_singleton()->draw);
  		if (get_script_instance()) {
  			Variant::CallError err;
  			get_script_instance()->call_multilevel_reversed(SceneStringNames::get_singleton()->_draw,NULL,0);
  		}
  		drawing=false;
  
  	}
  	//todo updating = false
  	pending_update=false; // don't change to false until finished drawing (avoid recursive update)
  }
  
  Transform2D CanvasItem::get_global_transform_with_canvas() const {
  
  	const CanvasItem *ci = this;
  	Transform2D xform;
  	const CanvasItem *last_valid=NULL;
  
  	while(ci) {
  
  		last_valid=ci;
  		xform = ci->get_transform() * xform;
  		ci=ci->get_parent_item();
  	}
  
  	if (last_valid->canvas_layer)
  		return last_valid->canvas_layer->get_transform() * xform;
  	else if (is_inside_tree())
  		return get_viewport()->get_canvas_transform() * xform;
  
  	return xform;
  }
  
  Transform2D CanvasItem::get_global_transform() const {
  
  
  	if (global_invalid) {
  
  		const CanvasItem *pi = get_parent_item();
  		if (pi)
  			global_transform = pi->get_global_transform() * get_transform();
  		else
  			global_transform = get_transform();
  
  		global_invalid=false;
  	}
  
  	return global_transform;
  
  }
  
  void CanvasItem::_toplevel_raise_self() {
  
  	if (!is_inside_tree())
  		return;
  
  	if (canvas_layer)
  		VisualServer::get_singleton()->canvas_item_set_draw_index(canvas_item,canvas_layer->get_sort_index());
  	else
  		VisualServer::get_singleton()->canvas_item_set_draw_index(canvas_item,get_viewport()->gui_get_canvas_sort_index());
  
  
  }
  
  
  void CanvasItem::_enter_canvas() {
  
  	if ((!get_parent() || !get_parent()->cast_to<CanvasItem>()) || toplevel) {
  
  		Node *n = this;
  
  		canvas_layer=NULL;
  
  		while(n) {
  
  			canvas_layer = n->cast_to<CanvasLayer>();
  			if (canvas_layer) {
  				break;
  			}
  			n=n->get_parent();
  		}
  
  		RID canvas;
  		if (canvas_layer)
  			canvas=canvas_layer->get_world_2d()->get_canvas();
  		else
  			canvas=get_viewport()->find_world_2d()->get_canvas();
  
  		VisualServer::get_singleton()->canvas_item_set_parent(canvas_item,canvas);
  
  		group = "root_canvas"+itos(canvas.get_id());
  
  		add_to_group(group);
  		if (canvas_layer)
  			canvas_layer->reset_sort_index();
  		else
  			get_viewport()->gui_reset_canvas_sort_index();
  
  		get_tree()->call_group(SceneTree::GROUP_CALL_UNIQUE,group,"_toplevel_raise_self");
  
  	} else {
  
  		CanvasItem *parent = get_parent_item();
  		canvas_layer=parent->canvas_layer;
  		VisualServer::get_singleton()->canvas_item_set_parent(canvas_item,parent->get_canvas_item());
  		VisualServer::get_singleton()->canvas_item_set_draw_index(canvas_item,get_index());
  	}
  
  	pending_update=false;
  	update();
  
  	notification(NOTIFICATION_ENTER_CANVAS);
  
  }
  
  void CanvasItem::_exit_canvas() {
  
  	notification(NOTIFICATION_EXIT_CANVAS,true); //reverse the notification
  	VisualServer::get_singleton()->canvas_item_set_parent(canvas_item,RID());
  	canvas_layer=NULL;
  	group="";
  
  }
  
  
  void CanvasItem::_notification(int p_what) {
  
  
  	switch(p_what) {
  		case NOTIFICATION_ENTER_TREE: {
  
  			first_draw=true;
  			if (get_parent()) {
  				CanvasItem *ci = get_parent()->cast_to<CanvasItem>();
  				if (ci)
  					C=ci->children_items.push_back(this);
  			}
  			_enter_canvas();
  			if (!block_transform_notify && !xform_change.in_list()) {
  				get_tree()->xform_change_list.add(&xform_change);
  			}
  		} break;
  		case NOTIFICATION_MOVED_IN_PARENT: {
  
  			if (!is_inside_tree())
  				break;
  
  			if (group!="") {
  				get_tree()->call_group(SceneTree::GROUP_CALL_UNIQUE,group,"_toplevel_raise_self");
  			} else {
  				CanvasItem *p = get_parent_item();
  				ERR_FAIL_COND(!p);
  				VisualServer::get_singleton()->canvas_item_set_draw_index(canvas_item,get_index());
  			}
  
  
  		} break;
  		case NOTIFICATION_EXIT_TREE: {
  			if (xform_change.in_list())
  				get_tree()->xform_change_list.remove(&xform_change);
  			_exit_canvas();
  			if (C) {
  				get_parent()->cast_to<CanvasItem>()->children_items.erase(C);
  				C=NULL;
  			}
  			global_invalid=true;
  		} break;
  		case NOTIFICATION_DRAW: {
  
  		} break;
  		case NOTIFICATION_TRANSFORM_CHANGED: {
  
  
  		} break;
  		case NOTIFICATION_VISIBILITY_CHANGED: {
  
  			emit_signal(SceneStringNames::get_singleton()->visibility_changed);
  		} break;
  
  	}
  }
  
  void CanvasItem::_set_visible_(bool p_visible) {
  
  	if (p_visible)
  		show();
  	else
  		hide();
  }
  bool CanvasItem::_is_visible_() const {
  
  	return !is_hidden();
  }
  
  
  void CanvasItem::update() {
  
  	if (!is_inside_tree())
  		return;
  	if (pending_update)
  		return;
  
  	pending_update=true;
  
  	MessageQueue::get_singleton()->push_call(this,"_update_callback");
  }
  
  void CanvasItem::set_modulate(const Color& p_modulate) {
  
  	modulate=p_modulate;
  	VisualServer::get_singleton()->canvas_item_set_modulate(canvas_item,modulate);
  
  }
  Color CanvasItem::get_modulate() const {
  
  	return modulate;
  }
  
  
  void CanvasItem::set_as_toplevel(bool p_toplevel) {
  
  	if (toplevel==p_toplevel)
  		return;
  
  	if (!is_inside_tree()) {
  		toplevel=p_toplevel;
  		return;
  	}
  
  	_exit_canvas();
  	toplevel=p_toplevel;
  	_enter_canvas();
  }
  
  bool CanvasItem::is_set_as_toplevel() const {
  
  	return toplevel;
  }
  
  CanvasItem *CanvasItem::get_parent_item() const {
  
  	if (toplevel)
  		return NULL;
  
  	Node *parent = get_parent();
  	if (!parent)
  		return NULL;
  
  	return parent->cast_to<CanvasItem>();
  }
  
  
  void CanvasItem::set_self_modulate(const Color& p_self_modulate) {
  
  	self_modulate=p_self_modulate;
  	VisualServer::get_singleton()->canvas_item_set_self_modulate(canvas_item,self_modulate);
  
  }
  Color CanvasItem::get_self_modulate() const {
  
  	return self_modulate;
  }
  
  
  void CanvasItem::set_light_mask(int p_light_mask) {
  
  	light_mask=p_light_mask;
  	VS::get_singleton()->canvas_item_set_light_mask(canvas_item,p_light_mask);
  }
  
  int CanvasItem::get_light_mask() const{
  
  	return light_mask;
  }
  
  
  void CanvasItem::item_rect_changed(bool p_size_changed) {
  
  	if (p_size_changed)
  		update();
  	emit_signal(SceneStringNames::get_singleton()->item_rect_changed);
  }
  
  
  void CanvasItem::draw_line(const Point2& p_from, const Point2& p_to,const Color& p_color,float p_width,bool p_antialiased) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	VisualServer::get_singleton()->canvas_item_add_line(canvas_item,p_from,p_to,p_color,p_width,p_antialiased);
  }
  
  void CanvasItem::draw_rect(const Rect2& p_rect, const Color& p_color) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	VisualServer::get_singleton()->canvas_item_add_rect(canvas_item,p_rect,p_color);
  
  }
  
  void CanvasItem::draw_circle(const Point2& p_pos, float p_radius, const Color& p_color) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	VisualServer::get_singleton()->canvas_item_add_circle(canvas_item,p_pos,p_radius,p_color);
  
  }
  
  void CanvasItem::draw_texture(const Ref<Texture>& p_texture,const Point2& p_pos,const Color& p_modulate) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	ERR_FAIL_COND(p_texture.is_null());
  
  	p_texture->draw(canvas_item,p_pos,p_modulate);
  }
  
  void CanvasItem::draw_texture_rect(const Ref<Texture>& p_texture,const Rect2& p_rect, bool p_tile,const Color& p_modulate, bool p_transpose) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	ERR_FAIL_COND(p_texture.is_null());
  	p_texture->draw_rect(canvas_item,p_rect,p_tile,p_modulate,p_transpose);
  
  }
  void CanvasItem::draw_texture_rect_region(const Ref<Texture>& p_texture,const Rect2& p_rect, const Rect2& p_src_rect,const Color& p_modulate, bool p_transpose) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  	ERR_FAIL_COND(p_texture.is_null());
  	p_texture->draw_rect_region(canvas_item,p_rect,p_src_rect,p_modulate,p_transpose);
  }
  
  void CanvasItem::draw_style_box(const Ref<StyleBox>& p_style_box,const Rect2& p_rect) {
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	ERR_FAIL_COND(p_style_box.is_null());
  
  	p_style_box->draw(canvas_item,p_rect);
  
  }
  void CanvasItem::draw_primitive(const Vector<Point2>& p_points, const Vector<Color>& p_colors,const Vector<Point2>& p_uvs, Ref<Texture> p_texture,float p_width) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	RID rid = p_texture.is_valid() ? p_texture->get_rid() : RID();
  
  	VisualServer::get_singleton()->canvas_item_add_primitive(canvas_item,p_points,p_colors,p_uvs,rid,p_width);
  }
  void CanvasItem::draw_set_transform(const Point2& p_offset, float p_rot, const Size2& p_scale) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	Transform2D xform(p_rot,p_offset);
  	xform.scale_basis(p_scale);
  	VisualServer::get_singleton()->canvas_item_add_set_transform(canvas_item,xform);
  }
  
  void CanvasItem::draw_set_transform_matrix(const Transform2D& p_matrix) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	VisualServer::get_singleton()->canvas_item_add_set_transform(canvas_item,p_matrix);
  
  }
  
  void CanvasItem::draw_polygon(const Vector<Point2>& p_points, const Vector<Color>& p_colors,const Vector<Point2>& p_uvs, Ref<Texture> p_texture) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	RID rid = p_texture.is_valid() ? p_texture->get_rid() : RID();
  
  	VisualServer::get_singleton()->canvas_item_add_polygon(canvas_item,p_points,p_colors,p_uvs,rid);
  
  
  }
  
  void CanvasItem::draw_colored_polygon(const Vector<Point2>& p_points, const Color& p_color,const Vector<Point2>& p_uvs, Ref<Texture> p_texture) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	Vector<Color> colors;
  	colors.push_back(p_color);
  	RID rid = p_texture.is_valid() ? p_texture->get_rid() : RID();
  
  	VisualServer::get_singleton()->canvas_item_add_polygon(canvas_item,p_points,colors,p_uvs,rid);
  }
  
  void CanvasItem::draw_string(const Ref<Font>& p_font,const Point2& p_pos, const String& p_text,const Color& p_modulate,int p_clip_w) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL();
  	}
  
  	ERR_FAIL_COND(p_font.is_null());
  	p_font->draw(canvas_item,p_pos,p_text,p_modulate,p_clip_w);
  
  }
  
  float CanvasItem::draw_char(const Ref<Font>& p_font,const Point2& p_pos, const String& p_char,const String& p_next,const Color& p_modulate) {
  
  	if (!drawing) {
  		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
  		ERR_FAIL_V(0);
  	}
  
  	ERR_FAIL_COND_V(p_char.length()!=1,0);
  	ERR_FAIL_COND_V(p_font.is_null(),0);
  
  	return p_font->draw_char(canvas_item,p_pos,p_char[0],p_next.c_str()[0],p_modulate);
  
  }
  
  
  void CanvasItem::_notify_transform(CanvasItem *p_node) {
  
  	if (p_node->xform_change.in_list() && p_node->global_invalid)
  		return; //nothing to do
  
  	p_node->global_invalid=true;
  
  	if (notify_transform && !p_node->xform_change.in_list()) {
  		if (!p_node->block_transform_notify) {
  			if (p_node->is_inside_tree())
  				get_tree()->xform_change_list.add(&p_node->xform_change);
  		}
  	}
  
  
  	for(List<CanvasItem*>::Element *E=p_node->children_items.front();E;E=E->next()) {
  
  		CanvasItem* ci=E->get();
  		if (ci->toplevel)
  			continue;
  		_notify_transform(ci);
  	}
  }
  
  
  Rect2 CanvasItem::get_viewport_rect() const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),Rect2());
  	return get_viewport()->get_visible_rect();
  }
  
  RID CanvasItem::get_canvas() const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),RID());
  
  	if (canvas_layer)
  		return canvas_layer->get_world_2d()->get_canvas();
  	else
  		return get_viewport()->find_world_2d()->get_canvas();
  
  
  }
  
  CanvasItem *CanvasItem::get_toplevel() const {
  
  	CanvasItem *ci=const_cast<CanvasItem*>(this);
  	while(!ci->toplevel && ci->get_parent() && ci->get_parent()->cast_to<CanvasItem>()) {
  		ci=ci->get_parent()->cast_to<CanvasItem>();
  	}
  
  	return ci;
  }
  
  
  Ref<World2D> CanvasItem::get_world_2d() const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),Ref<World2D>());
  
  	CanvasItem *tl=get_toplevel();
  
  	if (tl->canvas_layer) {
  		return tl->canvas_layer->get_world_2d();
  	} else if (tl->get_viewport()) {
  		return tl->get_viewport()->find_world_2d();
  	} else {
  		return Ref<World2D>();
  	}
  
  }
  
  RID CanvasItem::get_viewport_rid() const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),RID());
  	return get_viewport()->get_viewport();
  }
  
  void CanvasItem::set_block_transform_notify(bool p_enable) {
  	block_transform_notify=p_enable;
  }
  
  bool CanvasItem::is_block_transform_notify_enabled() const {
  
  	return block_transform_notify;
  }
  
  void CanvasItem::set_draw_behind_parent(bool p_enable) {
  
  	if (behind==p_enable)
  		return;
  	behind=p_enable;
  	VisualServer::get_singleton()->canvas_item_set_draw_behind_parent(canvas_item,behind);
  
  }
  
  bool CanvasItem::is_draw_behind_parent_enabled() const{
  
  	return behind;
  }
  
  void CanvasItem::set_material(const Ref<CanvasItemMaterial>& p_material) {
  
  
  	material=p_material;
  	RID rid;
  	if (material.is_valid())
  		rid=material->get_rid();
  	VS::get_singleton()->canvas_item_set_material(canvas_item,rid);
  	_change_notify(); //properties for material exposed
  }
  
  void CanvasItem::set_use_parent_material(bool p_use_parent_material) {
  
  	use_parent_material=p_use_parent_material;
  	VS::get_singleton()->canvas_item_set_use_parent_material(canvas_item,p_use_parent_material);
  }
  
  bool CanvasItem::get_use_parent_material() const{
  
  	return use_parent_material;
  }
  
  Ref<CanvasItemMaterial> CanvasItem::get_material() const{
  
  	return material;
  }
  
  Vector2 CanvasItem::make_canvas_pos_local(const Vector2& screen_point) const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),screen_point);
  
  	Transform2D local_matrix = (get_canvas_transform() * 
  			get_global_transform()).affine_inverse();
  
  	return local_matrix.xform(screen_point);
  }
  
  InputEvent CanvasItem::make_input_local(const InputEvent& p_event) const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),p_event);
  
  	return p_event.xform_by( (get_canvas_transform() * get_global_transform()).affine_inverse() );
  
  }
  
  
  Vector2 CanvasItem::get_global_mouse_pos() const {
  
  	ERR_FAIL_COND_V(!get_viewport(),Vector2());
  	return get_canvas_transform().affine_inverse().xform( get_viewport()->get_mouse_pos() );
  }
  Vector2 CanvasItem::get_local_mouse_pos() const{
  
  	ERR_FAIL_COND_V(!get_viewport(),Vector2());
  
  	return get_global_transform().affine_inverse().xform( get_global_mouse_pos() );
  }
  
  
  void CanvasItem::_bind_methods() {
  
  	ClassDB::bind_method(_MD("_toplevel_raise_self"),&CanvasItem::_toplevel_raise_self);
  	ClassDB::bind_method(_MD("_update_callback"),&CanvasItem::_update_callback);
  	ClassDB::bind_method(_MD("_set_visible_"),&CanvasItem::_set_visible_);
  	ClassDB::bind_method(_MD("_is_visible_"),&CanvasItem::_is_visible_);
  
  	ClassDB::bind_method(_MD("edit_set_state","state"),&CanvasItem::edit_set_state);
  	ClassDB::bind_method(_MD("edit_get_state:Variant"),&CanvasItem::edit_get_state);
  	ClassDB::bind_method(_MD("edit_set_rect","rect"),&CanvasItem::edit_set_rect);
  	ClassDB::bind_method(_MD("edit_rotate","degrees"),&CanvasItem::edit_rotate);
  
  	ClassDB::bind_method(_MD("get_item_rect"),&CanvasItem::get_item_rect);
  	ClassDB::bind_method(_MD("get_item_and_children_rect"),&CanvasItem::get_item_and_children_rect);
  	//ClassDB::bind_method(_MD("get_transform"),&CanvasItem::get_transform);
  
  	ClassDB::bind_method(_MD("get_canvas_item"),&CanvasItem::get_canvas_item);
  
  	ClassDB::bind_method(_MD("is_visible"),&CanvasItem::is_visible);
  	ClassDB::bind_method(_MD("is_hidden"),&CanvasItem::is_hidden);
  	ClassDB::bind_method(_MD("show"),&CanvasItem::show);
  	ClassDB::bind_method(_MD("hide"),&CanvasItem::hide);
  	ClassDB::bind_method(_MD("set_hidden","hidden"),&CanvasItem::set_hidden);
  
  	ClassDB::bind_method(_MD("update"),&CanvasItem::update);
  
  	ClassDB::bind_method(_MD("set_as_toplevel","enable"),&CanvasItem::set_as_toplevel);
  	ClassDB::bind_method(_MD("is_set_as_toplevel"),&CanvasItem::is_set_as_toplevel);
  
  	ClassDB::bind_method(_MD("set_light_mask","light_mask"),&CanvasItem::set_light_mask);
  	ClassDB::bind_method(_MD("get_light_mask"),&CanvasItem::get_light_mask);
  
  	ClassDB::bind_method(_MD("set_modulate","modulate"),&CanvasItem::set_modulate);
  	ClassDB::bind_method(_MD("get_modulate"),&CanvasItem::get_modulate);
  	ClassDB::bind_method(_MD("set_self_modulate","self_modulate"),&CanvasItem::set_self_modulate);
  	ClassDB::bind_method(_MD("get_self_modulate"),&CanvasItem::get_self_modulate);
  
  	ClassDB::bind_method(_MD("set_draw_behind_parent","enable"),&CanvasItem::set_draw_behind_parent);
  	ClassDB::bind_method(_MD("is_draw_behind_parent_enabled"),&CanvasItem::is_draw_behind_parent_enabled);
  
  	ClassDB::bind_method(_MD("_set_on_top","on_top"),&CanvasItem::_set_on_top);
  	ClassDB::bind_method(_MD("_is_on_top"),&CanvasItem::_is_on_top);
  	//ClassDB::bind_method(_MD("get_transform"),&CanvasItem::get_transform);
  
  	ClassDB::bind_method(_MD("draw_line","from","to","color","width","antialiased"),&CanvasItem::draw_line,DEFVAL(1.0),DEFVAL(false));
  	ClassDB::bind_method(_MD("draw_rect","rect","color"),&CanvasItem::draw_rect);
  	ClassDB::bind_method(_MD("draw_circle","pos","radius","color"),&CanvasItem::draw_circle);
  	ClassDB::bind_method(_MD("draw_texture","texture:Texture","pos","modulate"),&CanvasItem::draw_texture,DEFVAL(Color(1,1,1,1)));
  	ClassDB::bind_method(_MD("draw_texture_rect","texture:Texture","rect","tile","modulate","transpose"),&CanvasItem::draw_texture_rect,DEFVAL(Color(1,1,1)),DEFVAL(false));
  	ClassDB::bind_method(_MD("draw_texture_rect_region","texture:Texture","rect","src_rect","modulate","transpose"),&CanvasItem::draw_texture_rect_region,DEFVAL(Color(1,1,1)),DEFVAL(false));
  	ClassDB::bind_method(_MD("draw_style_box","style_box:StyleBox","rect"),&CanvasItem::draw_style_box);
  	ClassDB::bind_method(_MD("draw_primitive","points","colors","uvs","texture:Texture","width"),&CanvasItem::draw_primitive,DEFVAL(Variant()),DEFVAL(1.0));
  	ClassDB::bind_method(_MD("draw_polygon","points","colors","uvs","texture:Texture"),&CanvasItem::draw_polygon,DEFVAL(PoolVector2Array()),DEFVAL(Variant()));
  	ClassDB::bind_method(_MD("draw_colored_polygon","points","color","uvs","texture:Texture"),&CanvasItem::draw_colored_polygon,DEFVAL(PoolVector2Array()),DEFVAL(Variant()));
  	ClassDB::bind_method(_MD("draw_string","font:Font","pos","text","modulate","clip_w"),&CanvasItem::draw_string,DEFVAL(Color(1,1,1)),DEFVAL(-1));
  	ClassDB::bind_method(_MD("draw_char","font:Font","pos","char","next","modulate"),&CanvasItem::draw_char,DEFVAL(Color(1,1,1)));
  
  	ClassDB::bind_method(_MD("draw_set_transform","pos","rot","scale"),&CanvasItem::draw_set_transform);
  	ClassDB::bind_method(_MD("draw_set_transform_matrix","xform"),&CanvasItem::draw_set_transform_matrix);
  	ClassDB::bind_method(_MD("get_transform"),&CanvasItem::get_transform);
  	ClassDB::bind_method(_MD("get_global_transform"),&CanvasItem::get_global_transform);
  	ClassDB::bind_method(_MD("get_global_transform_with_canvas"),&CanvasItem::get_global_transform_with_canvas);
  	ClassDB::bind_method(_MD("get_viewport_transform"),&CanvasItem::get_viewport_transform);
  	ClassDB::bind_method(_MD("get_viewport_rect"),&CanvasItem::get_viewport_rect);
  	ClassDB::bind_method(_MD("get_canvas_transform"),&CanvasItem::get_canvas_transform);
  	ClassDB::bind_method(_MD("get_local_mouse_pos"),&CanvasItem::get_local_mouse_pos);
  	ClassDB::bind_method(_MD("get_global_mouse_pos"),&CanvasItem::get_global_mouse_pos);
  	ClassDB::bind_method(_MD("get_canvas"),&CanvasItem::get_canvas);
  	ClassDB::bind_method(_MD("get_world_2d"),&CanvasItem::get_world_2d);
  	//ClassDB::bind_method(_MD("get_viewport"),&CanvasItem::get_viewport);
  
  	ClassDB::bind_method(_MD("set_material","material:CanvasItemMaterial"),&CanvasItem::set_material);
  	ClassDB::bind_method(_MD("get_material:CanvasItemMaterial"),&CanvasItem::get_material);
  
  	ClassDB::bind_method(_MD("set_use_parent_material","enable"),&CanvasItem::set_use_parent_material);
  	ClassDB::bind_method(_MD("get_use_parent_material"),&CanvasItem::get_use_parent_material);
  
  	ClassDB::bind_method(_MD("set_notify_local_transform","enable"),&CanvasItem::set_notify_local_transform);
  	ClassDB::bind_method(_MD("is_local_transform_notification_enabled"),&CanvasItem::is_local_transform_notification_enabled);
  
  	ClassDB::bind_method(_MD("set_notify_transform","enable"),&CanvasItem::set_notify_transform);
  	ClassDB::bind_method(_MD("is_transform_notification_enabled"),&CanvasItem::is_transform_notification_enabled);
  
  	ClassDB::bind_method(_MD("make_canvas_pos_local","screen_point"),
  			&CanvasItem::make_canvas_pos_local);
  	ClassDB::bind_method(_MD("make_input_local","event"),&CanvasItem::make_input_local);
  
  	BIND_VMETHOD(MethodInfo("_draw"));
  
  	ADD_GROUP("Visibility","");
  	ADD_PROPERTYNO( PropertyInfo(Variant::BOOL,"visible"), _SCS("_set_visible_"),_SCS("_is_visible_") );
  	ADD_PROPERTYNO( PropertyInfo(Variant::COLOR,"modulate"), _SCS("set_modulate"),_SCS("get_modulate") );
  	ADD_PROPERTYNO( PropertyInfo(Variant::COLOR,"self_modulate"), _SCS("set_self_modulate"),_SCS("get_self_modulate") );
  	ADD_PROPERTYNZ( PropertyInfo(Variant::BOOL,"show_behind_parent"), _SCS("set_draw_behind_parent"),_SCS("is_draw_behind_parent_enabled") );
  	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"show_on_top",PROPERTY_HINT_NONE,"",0), _SCS("_set_on_top"),_SCS("_is_on_top") ); //compatibility
  	ADD_PROPERTYNO( PropertyInfo(Variant::INT,"light_mask",PROPERTY_HINT_LAYERS_2D_RENDER), _SCS("set_light_mask"),_SCS("get_light_mask") );
  
  	ADD_GROUP("Material","");
  	ADD_PROPERTYNZ( PropertyInfo(Variant::OBJECT,"material",PROPERTY_HINT_RESOURCE_TYPE, "CanvasItemMaterial"), _SCS("set_material"),_SCS("get_material") );
  	ADD_PROPERTYNZ( PropertyInfo(Variant::BOOL,"use_parent_material"), _SCS("set_use_parent_material"),_SCS("get_use_parent_material") );
  	//exporting these two things doesn't really make much sense i think
  	//ADD_PROPERTY( PropertyInfo(Variant::BOOL,"transform/toplevel"), _SCS("set_as_toplevel"),_SCS("is_set_as_toplevel") );
  	//ADD_PROPERTY(PropertyInfo(Variant::BOOL,"transform/notify"),_SCS("set_transform_notify"),_SCS("is_transform_notify_enabled"));
  
  	ADD_SIGNAL( MethodInfo("draw") );
  	ADD_SIGNAL( MethodInfo("visibility_changed") );
  	ADD_SIGNAL( MethodInfo("hide") );
  	ADD_SIGNAL( MethodInfo("item_rect_changed") );
  
  
  
  	BIND_CONSTANT( BLEND_MODE_MIX );
  	BIND_CONSTANT( BLEND_MODE_ADD );
  	BIND_CONSTANT( BLEND_MODE_SUB );
  	BIND_CONSTANT( BLEND_MODE_MUL );
  	BIND_CONSTANT( BLEND_MODE_PREMULT_ALPHA );
  
  
  	BIND_CONSTANT( NOTIFICATION_DRAW);
  	BIND_CONSTANT( NOTIFICATION_VISIBILITY_CHANGED );
  	BIND_CONSTANT( NOTIFICATION_ENTER_CANVAS );
  	BIND_CONSTANT( NOTIFICATION_EXIT_CANVAS );
  	BIND_CONSTANT( NOTIFICATION_TRANSFORM_CHANGED );
  
  
  }
  
  Transform2D CanvasItem::get_canvas_transform() const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),Transform2D());
  
  	if (canvas_layer)
  		return canvas_layer->get_transform();
  	else if (get_parent()->cast_to<CanvasItem>())
  		return get_parent()->cast_to<CanvasItem>()->get_canvas_transform();
  	else
  		return get_viewport()->get_canvas_transform();
  
  }
  
  Transform2D CanvasItem::get_viewport_transform() const {
  
  	ERR_FAIL_COND_V(!is_inside_tree(),Transform2D());
  
  	if (canvas_layer) {
  
  		if (get_viewport()) {
  			return get_viewport()->get_final_transform() * canvas_layer->get_transform();
  		} else {
  			return canvas_layer->get_transform();
  		}
  
  	} else {
  		return get_viewport()->get_final_transform() * get_viewport()->get_canvas_transform();
  	}
  
  }
  
  
  void CanvasItem::set_notify_local_transform(bool p_enable) {
  	notify_local_transform=p_enable;
  }
  
  bool CanvasItem::is_local_transform_notification_enabled() const {
  	return notify_local_transform;
  }
  
  
  void CanvasItem::set_notify_transform(bool p_enable) {
  	notify_transform=p_enable;
  }
  
  bool CanvasItem::is_transform_notification_enabled() const {
  	return notify_transform;
  }
  
  int CanvasItem::get_canvas_layer() const {
  
  	if (canvas_layer)
  		return canvas_layer->get_layer();
  	else
  		return 0;
  }
  
  
  Rect2 CanvasItem::get_item_and_children_rect() const {
  
  	Rect2 rect = get_item_rect();
  
  
  	for(int i=0;i<get_child_count();i++) {
  		CanvasItem *c=get_child(i)->cast_to<CanvasItem>();
  		if (c) {
  			Rect2 sir = c->get_transform().xform(c->get_item_and_children_rect());
  			rect = rect.merge(sir);
  		}
  	}
  
  	return rect;
  }
  
  CanvasItem::CanvasItem() : xform_change(this) {
  
  
  	canvas_item=VisualServer::get_singleton()->canvas_item_create();
  	hidden=false;
  	pending_update=false;
  	modulate=Color(1,1,1,1);
  	self_modulate=Color(1,1,1,1);
  	toplevel=false;
  	first_draw=false;
  	drawing=false;
  	behind=false;
  	block_transform_notify=false;	
  //	viewport=NULL;
  	canvas_layer=NULL;
  	use_parent_material=false;
  	global_invalid=true;
  	notify_local_transform=false;
  	notify_transform=false;
  	light_mask=1;
  
  	C=NULL;
  
  }
  
  CanvasItem::~CanvasItem() {
  
  	VisualServer::get_singleton()->free(canvas_item);
  }
  