Pixel-Composer/scripts/node_crop_content/node_crop_content.gml

function Node_Crop_Content(_x, _y, _group = noone) : Node(_x, _y, _group) constructor {
	name = "Crop Content";
	
	inputs[| 0] = nodeValue("Surface in", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	
	inputs[| 1] = nodeValue("Active", self, JUNCTION_CONNECT.input, VALUE_TYPE.boolean, true);
	
	inputs[| 2] = nodeValue("Array", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, 0)
		.setDisplay(VALUE_DISPLAY.enum_scroll, [ "Largest, same size", "Independent" ]);
		
	outputs[| 0] = nodeValue("Surface out", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, noone);
	
	input_display_list = [ 1,
		["Surface",	 false], 0, 2, 
	]
	
	drag_side = -1;
	drag_mx   = 0;
	drag_my   = 0;
	drag_sv   = 0;
	
	temp_surface = [ surface_create(1, 1), surface_create(1, 1) ];
	
	static update = function() {
		var _inSurf	= inputs[| 0].getValue();
		var _active	= inputs[| 1].getValue();
		var _array	= inputs[| 2].getValue();
		
		var _outSurf = outputs[| 0].getValue();
		surface_array_free(_outSurf);
		
		if(!_active) {			
			_outSurf = surface_array_clone(_inSurf);
			outputs[| 0].setValue(_outSurf);
			
			return;
		}
		
		var _arr = is_array(_inSurf);
		if(!_arr) _inSurf = [ _inSurf ];
			
		var minx = 99999;
		var miny = 99999;
		var maxx = 0;
		var maxy = 0;
		
		for( var j = 0; j < array_length(_inSurf); j++ ) {
			var _surf = _inSurf[j];
			
			var _dim = [ surface_get_width(_surf), surface_get_height(_surf) ]; 
			for( var i = 0; i < array_length(temp_surface); i++ ) {
				temp_surface[i] = surface_verify(temp_surface[i], 1, 1);
			
				shader_set(sh_find_boundary);
				shader_set_f(sh_find_boundary, "dimension", _dim);
				shader_set_i(sh_find_boundary, "mode", i);
				surface_set_target(temp_surface[i]);
					draw_clear_alpha(0, 0);
					BLEND_OVERRIDE;
					draw_surface_safe(_surf, 0, 0);
					BLEND_NORMAL;
				surface_reset_target();
				shader_reset();
			}
			
			var minBox = surface_getpixel_ext(temp_surface[0], 0, 0);
			var maxBox = surface_getpixel_ext(temp_surface[1], 0, 0);
			
			var _minx = max(0, color_get_red(minBox)  * 256 + color_get_green(minBox) - 1);
			var _miny = max(0, color_get_blue(minBox) * 256 + color_get_alpha(minBox) - 1);
			var _maxx = color_get_red(maxBox)  * 256 + color_get_green(maxBox);
			var _maxy = color_get_blue(maxBox) * 256 + color_get_alpha(maxBox);
			
			if(_array == 0) {
				minx = min(minx, _minx);
				miny = min(miny, _miny);
		
				maxx = max(maxx, _maxx);
				maxy = max(maxy, _maxy);
			} else if(_array == 1) {
				minx[j] = _minx;
				miny[j] = _miny;
		
				maxx[j] = _maxx;
				maxy[j] = _maxy;
			}
		}
		
		var res		= [];
		
		for( var i = 0; i < array_length(_inSurf); i++ ) {
			var _surf = _inSurf[i];
			
			if(_array == 0) {
				var resDim  = [maxx - minx, maxy - miny];
				res[i] = surface_create_valid(resDim[0], resDim[1]);
			
				surface_set_target(res[i]);
					draw_clear_alpha(0, 0);
					BLEND_OVERRIDE;
					draw_surface_safe(_surf, -minx, -miny);
					BLEND_NORMAL;
				surface_reset_target();
			} else if(_array == 1) {
				var resDim  = [maxx[i] - minx[i], maxy[i] - miny[i]];
				res[i] = surface_create_valid(resDim[0], resDim[1]);
			
				surface_set_target(res[i]);
					draw_clear_alpha(0, 0);
					BLEND_OVERRIDE;
					draw_surface_safe(_surf, -minx[i], -miny[i]);
					BLEND_NORMAL;
				surface_reset_target();
			}
		}
		
		if(!_arr) res = res[0];
		outputs[| 0].setValue(res);
	}
}