gistfile1.js

 ig.BackgroundMap.inject({
drawFull: function(context) {
        var ctx = context = context || ig.system.context,
            scale = ig.system.scale,
            tileWidthScaled = Math.floor(this.tilesize * scale),
            tileHeightScaled = Math.floor(this.tilesize * scale),
            tile;
        ctx.save();
        ctx.scale(scale, scale);
    	for( var y = 0; y < this.height; y++) {
			for( var x = 0; x < this.width; x++ ) {

                var pxX = Math.floor((x) * this.tilesize),
                    pxY = Math.floor((y) * this.tilesize);

                if( (tile = this.data[y][x]) ) {

                    ig.log(pxX,pxY,tileWidthScaled,tileHeightScaled);
                    ctx.fillStyle = 'rgba(216,184,123, .2)';
                    ctx.fillRect(pxX, pxY,tileWidthScaled, tileHeightScaled);
				}
			} // end for x
		} // end for y
         ctx.restore();
	}
 });