Added method 'Frame.load_bin(contents,width,height,offset)'

Allows loading a whole or partial bin 'graphic' from a string;
decouples bin loading from file reading if desired.
Frame.load() calls Frame.load_bin() in case of a .bin file.

exec/load/frame.js

@@ -787,9 +787,22 @@ Frame.prototype.load = function(filename,width,height) {
 		}			
 		break;
     case "BIN":
+        if (!this.load_bin(contents, width, height, 0)) return false;
+		break;
+	case "TXT":
+		var lines=contents.split(/\r\n/);
+		while(lines.length > 0)
+			this.putmsg(lines.shift() + "\r\n");
+		break;
+	default:
+		throw("unsupported filetype");
+		break;
+	}
+}
+Frame.prototype.load_bin = function(contents, width, height, offset) {
     if(width == undefined || height == undefined)
         throw("unknown graphic dimensions");
-		var offset = 0;
+    if(offset == undefined) offset = 0;
     for(var y=0; y<height; y++) {
         for(var x=0; x<width; x++) {
             var c = new Char();
@@ -805,16 +818,7 @@ Frame.prototype.load = function(filename,width,height) {
             this.__properties__.data[y][x] = c;
         }
     }
-		break;
-	case "TXT":
-		var lines=contents.split(/\r\n/);
-		while(lines.length > 0)
-			this.putmsg(lines.shift() + "\r\n");
-		break;
-	default:
-		throw("unsupported filetype");
-		break;
-	}
+    return true;
 }
 Frame.prototype.scroll = function(x,y) {
 	var update = false;