Trims the canvas.
$canvasTrim[canvas]
$attachCanvas[redsquare;ball.png]New: $canvasSize[redsquare;width]x$canvasSize[redsquare;height] $canvasTrim[redsquare]$fillRect[redsquare;#FF0000;50;50;150;150]Old: $canvasSize[redsquare;width]x$canvasSize[redsquare;height]$createCanvas[redsquare;250;250]