Pixel-Composer/scripts/node_composite/node_composite.gml

enum NODE_COMPOSE_DRAG {
	move,
	rotate,
	scale
}

enum COMPOSE_OUTPUT_SCALING {
	first,
	largest,
	constant
}

function Node_Composite(_x, _y, _group = noone) : Node_Processor(_x, _y, _group) constructor {
	name = "Composite";
	
	inputs[| 0] = nodeValue("Padding", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, [ 0, 0, 0, 0 ])
		.setDisplay(VALUE_DISPLAY.padding);
	
	inputs[| 1] = nodeValue_Enum_Scroll("Output dimension", self,  COMPOSE_OUTPUT_SCALING.first, [ "First surface", "Largest surface", "Constant" ]);
	
	inputs[| 2] = nodeValue_Dimension(self)
		.setVisible(false);
	
	attribute_surface_depth();
	attribute_interpolation();
	
	attributes.layer_visible    = [];
	attributes.layer_selectable = [];
	properties_expand = [];
	
	hold_visibility = true;
	hold_select		= true;
	layer_dragging	= noone;
	layer_remove	= -1;
	
	canvas_group    = noone;
	canvas_draw     = noone;
	
	renaming       = noone;
	rename_text    = "";
	renaming_index = noone;
	tb_rename = new textBox(TEXTBOX_INPUT.text, function(_name) { 
		if(renaming == noone) return;
		
		if(is_real(renaming)) 
			inputs[| renaming].setName(_name);
			
		else if(is_struct(renaming) && is_instanceof(renaming, Node))
			renaming.setDisplayName(_name) 
			
		renaming = noone;
		renaming_index = noone;
	});
	tb_rename.font = f_p1;
	tb_rename.hide = true;
	
	layer_height    = 0;
	layer_renderer	= new Inspector_Custom_Renderer(function(_x, _y, _w, _m, _hover, _focus) {
		PROCESSOR_OVERLAY_CHECK
		
		var amo = getInputAmount();
		var lh  = ui(28);
		var eh  = ui(36);
		
		properties_expand = array_verify(properties_expand, amo);
		var _h = ui(4);
		
		draw_sprite_stretched_ext(THEME.ui_panel_bg, 1, _x, _y, _w, layer_height, COLORS.node_composite_bg_blend, 1);
		
		var _vis = attributes.layer_visible;
		var _sel = attributes.layer_selectable;
		var ly   = _y + ui(4);
		var ssh  = lh - ui(4);
		var hoverIndex = noone;
		
		var _cy = ly;
		
		layer_remove = -1;
		for(var i = 0; i < amo; i++) {
			var ind   = amo - i - 1;
			var index = input_fix_len + ind * data_length;
			var _surf = current_data[index + 0];
			var _pos  = current_data[index + 1];
			var _inp  = inputs[| index];
			var _junc = _inp.value_from? _inp.value_from.node : noone;
			
			var _bx = _x + _w - ui(24);
			var aa  = (ind != layer_dragging || layer_dragging == noone)? 1 : 0.5;
			var vis = _vis[ind];
			var sel = _sel[ind];
			
			var _exp = properties_expand[i];
			var _lh  = lh + ui(4) + _exp * eh;
			_h += _lh;
			
			#region extended
				if(_exp) { 
					var _px = _x + ui(4);
					var _py = _cy + lh + ui(4);
					var _pw = _w - ui(8);
					var _ph = eh - ui(4);
					
					var _pww = (_pw - ui(8)) / 2 - ui(8);
					var _pwh = _ph - ui(8);
					
					draw_sprite_stretched_ext(THEME.ui_panel_bg, 0, _px, _py, _pw, _ph, COLORS.node_composite_bg_blend, 1);
					
					var jn_bld = inputs[| index + 4];
					var jn_alp = inputs[| index + 5];
					
					var wd_bld = jn_bld.editWidget;
					var wd_alp = jn_alp.editWidget;
					
					var _param = new widgetParam(_px + ui(4), _py + ui(4), _pww, _pwh, jn_bld.showValue(), jn_bld.display_data, _m, layer_renderer.rx, layer_renderer.ry);
					    _param.font = f_p2;
					    
					wd_bld.setFocusHover(_focus, _hover);
					wd_bld.drawParam(_param);
					
					var _param = new widgetParam(_px + ui(4) + _pww + ui(8), _py + ui(4), _pww, _pwh, jn_alp.showValue(), jn_alp.display_data, _m, layer_renderer.rx, layer_renderer.ry);
					    _param.font = f_p2;
					    
					wd_alp.setFocusHover(_focus, _hover);
					wd_alp.drawParam(_param);
				} 
			#endregion
			
			#region draw buttons
				if(point_in_circle(_m[0], _m[1], _bx, _cy + lh / 2, ui(16))) {
					draw_sprite_ui_uniform(THEME.icon_delete, 3, _bx, _cy + lh / 2, 1, COLORS._main_value_negative);
					
					if(mouse_press(mb_left, _focus))
						layer_remove = ind;
				} else 
					draw_sprite_ui_uniform(THEME.icon_delete, 3, _bx, _cy + lh / 2, 1, COLORS._main_icon);
				
				if(!is_surface(_surf)) continue;
				
				var _bx = _x + ui(16 + 24);
				if(point_in_circle(_m[0], _m[1], _bx, _cy + lh / 2, ui(12))) {
					draw_sprite_ui_uniform(THEME.junc_visible, vis, _bx, _cy + lh / 2, 1, c_white);
					
					if(mouse_press(mb_left, _focus))
						hold_visibility = !_vis[ind];
						
					if(mouse_click(mb_left, _focus) && _vis[ind] != hold_visibility) {
						_vis[ind] = hold_visibility;
						doUpdate();
					}
				} else 
					draw_sprite_ui_uniform(THEME.junc_visible, vis, _bx, _cy + lh / 2, 1, COLORS._main_icon, 0.5 + 0.5 * vis);
				
				_bx += ui(12 + 1 + 12);
				if(point_in_circle(_m[0], _m[1], _bx, _cy + lh / 2, ui(12))) {
					draw_sprite_ui_uniform(THEME.cursor_select, sel, _bx, _cy + lh / 2, 1, c_white);
					
					if(mouse_press(mb_left, _focus))
						hold_select = !_sel[ind];
						
					if(mouse_click(mb_left, _focus) && _sel[ind] != hold_select)
						_sel[ind] = hold_select;
				} else 
					draw_sprite_ui_uniform(THEME.cursor_select, sel, _bx, _cy + lh / 2, 1, COLORS._main_icon, 0.5 + 0.5 * sel);
				
				var hover = _hover && point_in_rectangle(_m[0], _m[1], _bx + ui(12 + 6), _cy, _x + _w - ui(48), _cy + lh - 1);
			#endregion
			
			#region draw surface
				var _sx0 = _bx + ui(12 + 6);
				var _sx1 = _sx0 + ssh;
				var _sy0 = _cy + ui(3);
				var _sy1 = _sy0 + ssh;
				
				var _ssw = surface_get_width_safe(_surf);
				var _ssh = surface_get_height_safe(_surf);
				var _sss = min(ssh / _ssw, ssh / _ssh);
				draw_surface_ext_safe(_surf, _sx0, _sy0, _sss, _sss, 0, c_white, 1);
				
				if(surface_selecting == index) draw_sprite_stretched_add(THEME.s_box_r2, 1, _sx0, _sy0, ssh, ssh, COLORS._main_accent, 1);
				else						   draw_sprite_stretched_add(THEME.s_box_r2, 1, _sx0, _sy0, ssh, ssh, COLORS._main_icon, 0.3);
			#endregion
			
			#region canvas layers
				var _junc_canvas = noone;
				var _jun_layer   = noone;
				if(canvas_draw != noone && _junc && struct_has(canvas_draw.layers, _junc.node_id)) {
					_jun_layer   = canvas_draw.layers[$ _junc.node_id];
					_junc_canvas = _jun_layer.canvas;
				}
			#endregion
			
			#region draw title
				var _txt = _inp.name;
				var _txx = _sx1 + ui(12);
				var _txy = _cy + lh / 2 + ui(2);
				
				if(_junc_canvas) hover &= _m[0] > _txx + ui(8 + 16);
				
				draw_set_text(f_p1, fa_left, fa_center, hover? COLORS._main_text_accent : COLORS._main_text);
				if(canvas_draw != noone && _junc_canvas)
					_txt = _junc_canvas.display_name;
				
				if(renaming_index == index) {
					tb_rename.setFocusHover(_focus, _hover);
					tb_rename.draw(_txx, _cy, _w - ui(172), lh, rename_text, _m);
				
				} else {
					var _txw = string_width(_txt);
					var _txh = string_height(_txt);
					
					if(_junc_canvas) {
						var _icx = _txx + ui(8);
						var _icy = _txy - ui(1);
						var _icc = COLORS._main_icon;
						var _ica = aa * .8;
						
						if(_hover && point_in_circle(_m[0], _m[1], _icx, _icy, ui(10))) {
							_icc = COLORS._main_icon_light;
							_ica = 1;
							
							if(DOUBLE_CLICK) {
								var pan = panelAdd("Panel_Inspector", true);
								pan.content.setInspecting(_junc_canvas, true);
							}
						}
				
						draw_sprite_ui_uniform(THEME.icon_canvas, 0, _icx, _icy, 1, _icc, _ica);
						
						draw_set_alpha(aa);
						draw_text(_txx + ui(8 + 16), _txy, _txt);
						draw_set_alpha(1);
					} else {
						draw_set_alpha(aa);
						draw_text(_txx, _txy, _txt);
						draw_set_alpha(1);
					}
				}
			#endregion
			
			#region modifiers
				if(_jun_layer) {
					var _modis = _jun_layer.modifier;
					var _mdx   = _sx0;
					var _mdy   = _cy + _lh;
					var mh     = ui(24);
					
					for (var j = array_length(_modis) - 1; j >= 0; j--) {
						var _modi = _modis[j];
						var _mtx  = _mdx;
						
						if(_modi.active_index != -1) {
							var _bx = _mtx + ui(12);
							var _by = _mdy + mh / 2;
							
							var _acti = _modi.getInputData(_modi.active_index);
							
							if(_hover && point_in_circle(_m[0], _m[1], _bx, _by, ui(12))) {
								draw_sprite_ui_uniform(THEME.visible_12, _acti, _bx, _by - ui(2), 1, c_white);
								
								if(mouse_press(mb_left, _focus))
									_modi.inputs[| _modi.active_index].setValue(!_acti);
							} else 
								draw_sprite_ui_uniform(THEME.visible_12, _acti, _bx, _by - ui(2), 1, COLORS._main_icon);
								
						}
						
						_mtx += ui(24);
						var _mhov = _hover && point_in_rectangle(_m[0], _m[1], _mtx, _mdy, _x + _w, _mdy + mh - 1);
						draw_set_text(f_p2, fa_left, fa_center, _mhov? COLORS._main_text : COLORS._main_text_sub);
						draw_text_add(_mtx, _mdy + mh / 2 - ui(2), _modi.display_name);
						
						if(_mhov && DOUBLE_CLICK) {
							var pan = panelAdd("Panel_Inspector", true);
							pan.content.setInspecting(_modi, true);
						}
						
						_h   += mh;
						_lh  += mh;
						_mdy += mh;
					}
				}
			#endregion
			
			if(_hover && point_in_rectangle(_m[0], _m[1], _x, _cy, _x + _w, _cy + lh)) {
				hoverIndex = ind;
				if(layer_dragging != noone) {
					draw_set_color(COLORS._main_accent);
					if(layer_dragging > ind)
						draw_line_width(_x + ui(16), _cy + lh + 2, _x + _w - ui(16), _cy + lh + ui(2), 2);
					else if(layer_dragging < ind)
						draw_line_width(_x + ui(16), _cy - 2, _x + _w - ui(16), _cy - ui(2), 2);
				}
			}
			
			var _bx = _x + ui(8 + 8);
			var cc  = COLORS._main_icon;
			if(point_in_rectangle(_m[0], _m[1], _bx - ui(8), _cy + ui(4), _bx + ui(8), _cy + lh - ui(4))) {
				cc = c_white;
				
				if(mouse_press(mb_left, _focus))
					properties_expand[i] = !properties_expand[i];
			}
			
			draw_sprite_ui_uniform(THEME.arrow, _exp? 3 : 0, _bx, _cy + lh / 2 + _exp * 2, 1, cc);
			
			if(hover && layer_dragging == noone || layer_dragging == ind) {
				if(DOUBLE_CLICK) {
					renaming_index = index;
					renaming       = index;
					rename_text    = _txt;
					
					if(canvas_draw != noone && _junc_canvas)
						renaming = _junc_canvas;
						
					tb_rename._current_text = _txt;
					tb_rename.activate();
				}
				
				if(mouse_press(mb_left, _focus)) {
					layer_dragging = ind;
					surface_selecting = index;
				}
			}
			
			_cy += _lh;
		}
		
		if(layer_dragging != noone && mouse_release(mb_left)) {
			if(layer_dragging != hoverIndex && hoverIndex != noone) {
				var index = input_fix_len + layer_dragging * data_length;
				var targt = input_fix_len + hoverIndex * data_length;
				var _vis = attributes.layer_visible;
				var _sel = attributes.layer_selectable;
				
				var ext = [];
				var vis = _vis[layer_dragging];
				array_delete(_vis, layer_dragging, 1);
				array_insert(_vis, hoverIndex, vis);
				
				var sel = _sel[layer_dragging];
				array_delete(_sel, layer_dragging, 1);
				array_insert(_sel, hoverIndex, sel);
				
				for( var i = 0; i < data_length; i++ ) {
					ext[i] = inputs[| index];
					ds_list_delete(inputs, index);
				}
				
				for( var i = 0; i < data_length; i++ )
					ds_list_insert(inputs, targt + i, ext[i]);
				
				doUpdate();
			}
			
			layer_dragging = noone;
			if(canvas_group) canvas_group.onLayerChanged();
		}
		
		layer_height     = max(ui(16), _h);
		layer_renderer.h = layer_height;
		
		if(layer_remove > -1) {
			deleteLayer(layer_remove);
			layer_remove = -1;
		}
		
		return layer_height;
	});
	
	input_display_list = [
		["Output",	 true],	0, 1, 2,
		["Layers",	false],	layer_renderer,
		["Surfaces", true],	
	];
	
	input_display_list_len = array_length(input_display_list);
	
	function deleteLayer(index) {
		var idx = input_fix_len + index * data_length;
		
		if(canvas_group) {
			var _inp   = inputs[| idx];
			var _nodes = [];
			
			while(_inp != noone) {
				var _n = _inp.value_from.node;
				array_push_unique(_nodes, _n);
				
				_inp = noone;
				for(var i = 0; i < ds_list_size(_n.inputs); i++) {
					if(_n.inputs[| i].value_from != noone)
						_inp = _n.inputs[| i];
				}
			}
			
			for (var i = 0, n = array_length(_nodes); i < n; i++)
				_nodes[i].destroy();
			return;
		} 
		
		for( var i = 0; i < data_length; i++ )
			ds_list_delete(inputs, idx);
		
		input_display_list = array_clone(input_display_list_raw, 1);
		
		for(var i = input_fix_len, n = ds_list_size(inputs); i < n; i++)
			array_push(input_display_list, i);
		
		doUpdate();
	}
	
	static createNewInput = function() { 
		var index = ds_list_size(inputs);
		var _s    = floor((index - input_fix_len) / data_length);
		
		inputs[| index + 0] = nodeValue($"Surface {_s}", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, noone);
		inputs[| index + 0].hover_effect  = 0;
		
		inputs[| index + 1] = nodeValue($"Position {_s}", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [ 0, 0 ] )
			.setDisplay(VALUE_DISPLAY.vector)
			.setUnitRef(function(index) { return [ overlay_w, overlay_h ]; });
		
		inputs[| index + 2] = nodeValue_Rotation($"Rotation {_s}", self, 0);
		
		inputs[| index + 3] = nodeValue($"Scale {_s}", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [ 1, 1 ] )
			.setDisplay(VALUE_DISPLAY.vector);
		
		inputs[| index + 4] = nodeValue_Enum_Scroll($"Blend {_s}", self,  0, BLEND_TYPES );
		
		inputs[| index + 5] = nodeValue($"Opacity {_s}", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 1)
			.setDisplay(VALUE_DISPLAY.slider);
		
		for( var i = 0; i < data_length; i++ ) {
			array_push(input_display_list, index + i);
			inputs[| index + i].surface_index = index;
		}
		
		while(_s >= array_length(attributes.layer_visible))
			array_push(attributes.layer_visible, true);
			
		while(_s >= array_length(attributes.layer_selectable))
			array_push(attributes.layer_selectable, true);
		
		return inputs[| index + 0];
	} 
	
	setDynamicInput(6, true, VALUE_TYPE.surface);
	
	outputs[| 0] = nodeValue("Surface out", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, noone);
	
	outputs[| 1] = nodeValue("Atlas data", self, JUNCTION_CONNECT.output, VALUE_TYPE.atlas, []);
	
	outputs[| 2] = nodeValue_Dimension(self, JUNCTION_CONNECT.output, VALUE_TYPE.integer, [1, 1])
		.setVisible(false)
		.setDisplay(VALUE_DISPLAY.vector);
	
	temp_surface = [ surface_create(1, 1), surface_create(1, 1), surface_create(1, 1) ];
	blend_temp_surface = temp_surface[2];
	
	surface_selecting = noone;
	surf_dragging  = -1;
	input_dragging = -1;
	drag_type      = 0;
	dragging_sx    = 0;
	dragging_sy    = 0;
	dragging_mx    = 0;
	dragging_my    = 0;
	
	rot_anc_x = 0;
	rot_anc_y = 0;
	
	overlay_w = 0;
	overlay_h = 0;
	
	static drawOverlay = function(hover, active, _x, _y, _s, _mx, _my, _snx, _sny) {
		PROCESSOR_OVERLAY_CHECK
		
		var pad = current_data[0];
		var ww  = overlay_w;
		var hh  = overlay_h;
		
		var x0  = _x + pad[2] * _s;
		var x1  = _x + (ww - pad[0]) * _s;
		var y0  = _y + pad[1] * _s;
		var y1  = _y + (hh - pad[3]) * _s;
		
		if(input_dragging > -1) {
			if(drag_type == NODE_COMPOSE_DRAG.move) {
				var _dx = (_mx - dragging_mx) / _s;
				var _dy = (_my - dragging_my) / _s;
				
				if(key_mod_press(SHIFT)) {
					if(abs(_dx) > abs(_dy) + ui(16))
						_dy = 0;
					else if(abs(_dy) > abs(_dx) + ui(16))
						_dx = 0;
					else {
						_dx = max(_dx, _dy);
						_dy = _dx;
					}
				}
				
				var pos_x = value_snap(dragging_sx + _dx, _snx);
				var pos_y = value_snap(dragging_sy + _dy, _sny);
				
				if(key_mod_press(ALT)) {
					var _surf = current_data[input_dragging - 1];
					var _sw = surface_get_width_safe(_surf);
					var _sh = surface_get_height_safe(_surf);
					
					var x0 = pos_x, x1 = pos_x + _sw;
					var y0 = pos_y, y1 = pos_y + _sh;
					var xc = (x0 + x1) / 2;
					var yc = (y0 + y1) / 2;
					var snap = 4;
					
					draw_set_color(COLORS._main_accent);
					if(abs(x0 -  0) < snap) {
						pos_x = 0;
						draw_line_width(_x + _s * 0, 0, _x + _s * 0, WIN_H, 2);
					}
					
					if(abs(y0 -  0) < snap) {
						pos_y = 0;
						draw_line_width(0, _y + _s * 0, WIN_W, _y + _s * 0, 2);
					}
					
					if(abs(x1 - ww) < snap) {
						pos_x = ww - _sw;
						draw_line_width(_x + _s * ww, 0, _x + _s * ww, WIN_H, 2);
					}
					
					if(abs(y1 - hh) < snap) {
						pos_y = hh - _sh;
						draw_line_width(0, _y + _s * hh, WIN_W, _y + _s * hh, 2);
					}
					
					if(abs(xc - ww / 2) < snap) {
						pos_x = ww / 2 - _sw / 2;
						draw_line_width(_x + _s * ww / 2, 0, _x + _s * ww / 2, WIN_H, 2);
					}
					
					if(abs(yc - hh / 2) < snap) {
						pos_y = hh / 2 - _sh / 2;
						draw_line_width(0, _y + _s * hh / 2, WIN_W, _y + _s * hh / 2, 2);
					}
				}
				
				if(inputs[| input_dragging].setValue([ pos_x, pos_y ]))
					UNDO_HOLDING = true;
					
			} else if(drag_type == NODE_COMPOSE_DRAG.rotate) {
				var aa = point_direction(rot_anc_x, rot_anc_y, _mx, _my);
				var da = angle_difference(dragging_mx, aa);
				var sa;
				
				if(key_mod_press(CTRL)) 
					sa = round((dragging_sx - da) / 15) * 15;
				else 
					sa = dragging_sx - da;
			
				if(inputs[| input_dragging].setValue(sa))
					UNDO_HOLDING = true;	
			
			} else if(drag_type == NODE_COMPOSE_DRAG.scale) {
				var _surf = current_data[surf_dragging + 0];
				var _rot  = current_data[surf_dragging + 2];
				var _sw   = surface_get_width_safe(_surf);
				var _sh   = surface_get_height_safe(_surf);
				
				var _p = point_rotate(_mx - dragging_mx, _my - dragging_my, 0, 0, -_rot);
				var sca_x = _p[0] / _s / _sw * 2;
				var sca_y = _p[1] / _s / _sh * 2;
				
				if(key_mod_press(SHIFT)) {
					sca_x = min(sca_x, sca_y);
					sca_y = min(sca_x, sca_y);
				}
				
				if(inputs[| input_dragging].setValue([ sca_x, sca_y ]))
					UNDO_HOLDING = true;
				
			}
			
			if(mouse_release(mb_left)) {
				input_dragging = -1;
				UNDO_HOLDING = false;
			}
		}
		
		var hovering      = noone;
		var hovering_type = noone;
		var _vis = attributes.layer_visible;
		var _sel = attributes.layer_selectable;
		
		var amo     = getInputAmount();
		var anchors = array_create(ds_list_size(inputs));
		
		for(var i = 0; i < amo; i++) {
			var vis = _vis[i];
			var sel = _sel[i];
			
			var index = input_fix_len + i * data_length;
			var _surf = current_data[index + 0];
			var _pos  = current_data[index + 1];
			var _rot  = current_data[index + 2];
			var _sca  = current_data[index + 3];
			
			if(!is_surface(_surf)) continue;
			
			var _ww = surface_get_width_safe(_surf);
			var _hh = surface_get_height_safe(_surf);
			var _sw = _ww * _sca[0];
			var _sh = _hh * _sca[1];
			
			var _cx = _pos[0] + _ww / 2;
			var _cy = _pos[1] + _hh / 2;
			
			var _d0 = point_rotate(_cx - _sw / 2, _cy - _sh / 2, _cx, _cy, _rot);
			var _d1 = point_rotate(_cx - _sw / 2, _cy + _sh / 2, _cx, _cy, _rot);
			var _d2 = point_rotate(_cx + _sw / 2, _cy - _sh / 2, _cx, _cy, _rot);
			var _d3 = point_rotate(_cx + _sw / 2, _cy + _sh / 2, _cx, _cy, _rot);
			var _rr = point_rotate(_cx,  _cy - _sh / 2 - 1,      _cx, _cy, _rot);
			
			_d0[0] = overlay_x(_d0[0], _x, _s); _d0[1] = overlay_y(_d0[1], _y, _s);
			_d1[0] = overlay_x(_d1[0], _x, _s); _d1[1] = overlay_y(_d1[1], _y, _s);
			_d2[0] = overlay_x(_d2[0], _x, _s); _d2[1] = overlay_y(_d2[1], _y, _s);
			_d3[0] = overlay_x(_d3[0], _x, _s); _d3[1] = overlay_y(_d3[1], _y, _s);
			_rr[0] = overlay_x(_rr[0], _x, _s); _rr[1] = overlay_y(_rr[1], _y, _s);
			
			anchors[index] = {
				cx: _cx,
				cy: _cy,
				d0: _d0,
				d1: _d1,
				d2: _d2,
				d3: _d3,
				rr: _rr,
				
				rot: _rot,
			}
		}
		
		for(var i = 0; i < amo; i++) {
			var vis = _vis[i];
			var sel = _sel[i];
			if(!vis) continue;
			
			var index = input_fix_len + i * data_length;
			var _surf = current_data[index + 0];
			var _pos  = current_data[index + 1];
			var _rot  = current_data[index + 2];
			var _sca  = current_data[index + 3];
			
			if(!_surf || is_array(_surf)) continue;
			
			var a = anchors[index];
			if(!is_struct(a)) continue;
			
			if(surface_selecting == index) {
				var _ri = 0;
				var _si = 0;
			
				if(point_in_circle(_mx, _my, a.d3[0], a.d3[1], 12)) {
					hovering = index;
					hovering_type = NODE_COMPOSE_DRAG.scale;
					_si = 1;
				} else if(point_in_rectangle_points(_mx, _my, a.d0[0], a.d0[1], a.d1[0], a.d1[1], a.d2[0], a.d2[1], a.d3[0], a.d3[1])) {
					hovering = index;
					hovering_type = NODE_COMPOSE_DRAG.move;
				} else if(point_in_circle(_mx, _my, a.rr[0], a.rr[1], 12)) {
					hovering = index;
					hovering_type = NODE_COMPOSE_DRAG.rotate;
					_ri = 1;
				}
				
				draw_sprite_colored(THEME.anchor_rotate, _ri, a.rr[0], a.rr[1],, a.rot);
				draw_sprite_colored(THEME.anchor_scale,  _si, a.d3[0], a.d3[1],, a.rot);
				
			} else if(point_in_rectangle_points(_mx, _my, a.d0[0], a.d0[1], a.d1[0], a.d1[1], a.d2[0], a.d2[1], a.d3[0], a.d3[1]) && 
				(hovering != surface_selecting || surface_selecting == noone)) {
					
				hovering = index;
				hovering_type = NODE_COMPOSE_DRAG.move;
			}
		}
		
		if(mouse_press(mb_left, active))
			surface_selecting = hovering;
		if(surface_selecting != noone) {
			var a = array_safe_get_fast(anchors, surface_selecting, noone);
			if(!is_struct(a)) surface_selecting = noone;
		}
		
		if(hovering != noone) {
			var a = anchors[hovering];
			
			draw_set_color(COLORS.node_composite_overlay_border);
			draw_line(a.d0[0], a.d0[1], a.d1[0], a.d1[1]);
			draw_line(a.d0[0], a.d0[1], a.d2[0], a.d2[1]);
			draw_line(a.d3[0], a.d3[1], a.d1[0], a.d1[1]);
			draw_line(a.d3[0], a.d3[1], a.d2[0], a.d2[1]);
		}
				
		if(surface_selecting != noone) {
			var a = anchors[surface_selecting];
			
			draw_set_color(COLORS._main_accent);
			draw_line(a.d0[0], a.d0[1], a.d1[0], a.d1[1]);
			draw_line(a.d0[0], a.d0[1], a.d2[0], a.d2[1]);
			draw_line(a.d3[0], a.d3[1], a.d1[0], a.d1[1]);
			draw_line(a.d3[0], a.d3[1], a.d2[0], a.d2[1]);
		}
		
		if(hovering != noone && mouse_press(mb_left, active)) {
			var a = anchors[hovering];
			
			if(hovering_type == NODE_COMPOSE_DRAG.move) {
				surf_dragging	= hovering;
				input_dragging	= hovering + 1;
				drag_type		= hovering_type;
				dragging_sx		= current_data[hovering + 1][0];
				dragging_sy		= current_data[hovering + 1][1];
				dragging_mx		= _mx;
				dragging_my		= _my;
			} else if(hovering_type == NODE_COMPOSE_DRAG.rotate) { //rot
				surf_dragging	= hovering;
				input_dragging	= hovering + 2;
				drag_type		= hovering_type;
				dragging_sx		= current_data[hovering + 2];
				rot_anc_x		= overlay_x(a.cx, _x, _s);
				rot_anc_y		= overlay_y(a.cy, _y, _s);
				dragging_mx		= point_direction(rot_anc_x, rot_anc_y, _mx, _my);
			} else if(hovering_type == NODE_COMPOSE_DRAG.scale) { //sca
				surf_dragging	= hovering;
				input_dragging	= hovering + 3;
				drag_type		= hovering_type;
				dragging_sx		= _sca[0];
				dragging_sy		= _sca[1];
				dragging_mx		= (a.d0[0] + a.d3[0]) / 2;
				dragging_my		= (a.d0[1] + a.d3[1]) / 2;
			}
		}
		
	}
	
	static step = function() {
		var _dim_type = getSingleValue(1);
		
		inputs[| 2].setVisible(_dim_type == COMPOSE_OUTPUT_SCALING.constant);
		
		if(canvas_draw != noone && surface_selecting == noone && getInputAmount())
			surface_selecting = input_fix_len;
	}
	
	static processData = function(_outData, _data, _output_index, _array_index) {
		var _outSurf  = _outData[0];
		
		if(array_length(_data) <= input_fix_len) return [ _outSurf, noone, [1, 1] ];
		
		var _pad	  = _data[0];
		var _dim_type = _data[1];
		var _dim	  = _data[2];
		var base	  = _data[3];
		var cDep	  = attrDepth();
		
		if(!is_surface(base)) return [ _outSurf, noone, [1, 1] ];
		
		#region dimension 
			var ww = 0, hh = 0;
		
			switch(_dim_type) {
				case COMPOSE_OUTPUT_SCALING.first :
					ww = surface_get_width_safe(base);
					hh = surface_get_height_safe(base);
					break;
				case COMPOSE_OUTPUT_SCALING.largest :
					for(var i = input_fix_len; i < array_length(_data) - data_length; i += data_length) {
						var _s = _data[i];
						ww = max(ww, surface_get_width_safe(_s));
						hh = max(hh, surface_get_height_safe(_s));
					}
					break;
				case COMPOSE_OUTPUT_SCALING.constant :	
					ww = _dim[0];
					hh = _dim[1];
					break;
			}
			ww += _pad[0] + _pad[2];
			hh += _pad[1] + _pad[3];
		
			overlay_w = ww;
			overlay_h = hh;
		#endregion
		
		for(var i = 0; i < 3; i++) {
			temp_surface[i] = surface_verify(temp_surface[i], ww, hh, cDep);
			surface_clear(temp_surface[i]);
		}
		
		var res_index = 0;
		var imageAmo  = getInputAmount();
		var _vis      = attributes.layer_visible;
		var bg        = 0;
		var _bg       = 0;
		var _atlas    = [];
		
		blend_temp_surface = temp_surface[2];
		
		for(var i = 0; i < imageAmo; i++) {
			var vis  = _vis[i];
			if(!vis) continue;
			
			var _ind = input_fix_len + i * data_length;
			var _s   = _data[_ind + 0];
			var _pos = _data[_ind + 1];
			var _rot = _data[_ind + 2];
			var _sca = _data[_ind + 3];
			var _bld = _data[_ind + 4];
			var _alp = _data[_ind + 5];
			
			if(!is_surface(_s)) continue;
			
			var _ww = surface_get_width_safe(_s);
			var _hh = surface_get_height_safe(_s);
			var _sw = _ww * _sca[0];
			var _sh = _hh * _sca[1];
			
			var cx = _pos[0] + _ww / 2;
			var cy = _pos[1] + _hh / 2;
			
			var _d0 = point_rotate(cx - _sw / 2, cy - _sh / 2, cx, cy, _rot);
			
			array_push(_atlas, new SurfaceAtlas(_s, _d0[0], _d0[1], _rot, _sca[0], _sca[1]));
			
			surface_set_shader(temp_surface[_bg], sh_sample, true, BLEND.over);
				draw_surface_blend_ext(temp_surface[!_bg], _s, _d0[0], _d0[1], _sca[0], _sca[1], _rot, c_white, _alp, _bld, true);
			surface_reset_shader();
			
			_bg = !_bg;
		}
		
		_outSurf = surface_verify(_outSurf, ww, hh, cDep);
		
		surface_set_shader(_outSurf);
			draw_surface_safe(temp_surface[!_bg]);
		surface_reset_shader();
		
		return [ _outSurf, _atlas, [ww, hh] ];
	}
	
	static attributeSerialize = function() {
		var att = {};
		att.layer_visible    = attributes.layer_visible;
		att.layer_selectable = attributes.layer_selectable;
		
		return att;
	}
	
	static attributeDeserialize = function(attr) {
		struct_append(attributes, attr); 
		
		if(struct_has(attributes, "use_project_dimension") && !struct_has(attr, "use_project_dimension"))
			attributes.use_project_dimension = false;
			
		if(struct_has(attr, "layer_visible"))
			attributes.layer_visible = attr.layer_visible;
			
		if(struct_has(attr, "layer_selectable"))
			attributes.layer_selectable = attr.layer_selectable;
	}
}