Trying a potention performance improvement in the Actor.animation-function in CAAT

gistfile1.txt

animate : function(director, time) {

    // General idea: 
    // try to touch the DOM as little as possible,
    // extra JS calculations much cheaper than extra DOM-settings

    if ( !this.isInAnimationFrame(time) ) {
        this.inFrame= false;
        this.dirty= true;
        this.style( 'display', 'none');
        return false;
    } else {
        // Change 1: checking whether visibility has changed before setting
        if(this.wasvisible !== this.visible) {
            this.style( 'display', this.visible ? 'block' : 'none');
            this.wasvisible = this.visible;
        }   
    }

    for( var i=0; i<this.behaviorList.length; i++ )	{
        this.behaviorList[i].apply(time,this);
    }

    // Change 2: checking whether opacity has changed before setting
    var newAlpha = this.parent ? this.parent.frameAlpha*this.alpha : 1; 
    if (this.frameAlpha!==newAlpha) { 
        this.frameAlpha = newAlpha;
        this.styleAlpha(this.frameAlpha);
    }
    this.inFrame= true;

    this.setModelViewMatrix(false);

    return true;
},