function BaseRenderer(){}
BaseRenderer.prototype.checkLayers = function(num){
    var i, len = this.layers.length, data;
    this.completeLayers = true;
    for (i = len - 1; i >= 0; i--) {
        if (!this.elements[i]) {
            data = this.layers[i];
            if(data.ip - data.st <= (num - this.layers[i].st) && data.op - data.st > (num - this.layers[i].st))
            {
                this.buildItem(i);
            }
        }
        this.completeLayers = this.elements[i] ? this.completeLayers:false;
    }
    this.checkPendingElements();
};

BaseRenderer.prototype.createItem = function(layer){
    switch(layer.ty){
        case 2:
            return this.createImage(layer);
        case 0:
            return this.createComp(layer);
        case 1:
            return this.createSolid(layer);
        case 3:
            return this.createNull(layer);
        case 4:
            return this.createShape(layer);
        case 5:
            return this.createText(layer);
        case 13:
            return this.createCamera(layer);
    }
    return this.createNull(layer);
};

BaseRenderer.prototype.createCamera = function(){
    throw new Error('You\'re using a 3d camera. Try the html renderer.');
};

BaseRenderer.prototype.buildAllItems = function(){
    var i, len = this.layers.length;
    for(i=0;i<len;i+=1){
        this.buildItem(i);
    }
    this.checkPendingElements();
};

BaseRenderer.prototype.includeLayers = function(newLayers){
    this.completeLayers = false;
    var i, len = newLayers.length;
    var j, jLen = this.layers.length;
    for(i=0;i<len;i+=1){
        j = 0;
        while(j<jLen){
            if(this.layers[j].id == newLayers[i].id){
                this.layers[j] = newLayers[i];
                break;
            }
            j += 1;
        }
    }
};

BaseRenderer.prototype.setProjectInterface = function(pInterface){
    this.globalData.projectInterface = pInterface;
};

BaseRenderer.prototype.initItems = function(){
    if(!this.globalData.progressiveLoad){
        this.buildAllItems();
    }
};
BaseRenderer.prototype.buildElementParenting = function(element, parentName, hierarchy) {
    var elements = this.elements;
    var layers = this.layers;
    var i=0, len = layers.length;
    while (i < len) {
        if (layers[i].ind == parentName) {
            if (!elements[i] || elements[i] === true) {
                this.buildItem(i);
                this.addPendingElement(element);
            } else {
                hierarchy.push(elements[i]);
                elements[i].setAsParent();
                if(layers[i].parent !== undefined) {
                    this.buildElementParenting(element, layers[i].parent, hierarchy);
                } else {
                    element.setHierarchy(hierarchy);
                }
            }
        }
        i += 1;
    }
};

BaseRenderer.prototype.addPendingElement = function(element){
    this.pendingElements.push(element);
};

BaseRenderer.prototype.searchExtraCompositions = function(assets){
    var i, len = assets.length;
    for(i=0;i<len;i+=1){
        if(assets[i].xt){
            var comp = this.createComp(assets[i]);
            comp.initExpressions();
            this.globalData.projectInterface.registerComposition(comp);
        }
    }
};

BaseRenderer.prototype.setupGlobalData = function(animData, fontsContainer) {
    this.globalData.fontManager = new FontManager();
    this.globalData.fontManager.addChars(animData.chars);
    this.globalData.fontManager.addFonts(animData.fonts, fontsContainer);
    this.globalData.getAssetData = this.animationItem.getAssetData.bind(this.animationItem);
    this.globalData.getAssetsPath = this.animationItem.getAssetsPath.bind(this.animationItem);
    this.globalData.elementLoaded = this.animationItem.elementLoaded.bind(this.animationItem);
    this.globalData.addPendingElement = this.animationItem.addPendingElement.bind(this.animationItem);
    this.globalData.frameId = 0;
    this.globalData.frameRate = animData.fr;
    this.globalData.nm = animData.nm;
    this.globalData.compSize = {
        w: animData.w,
        h: animData.h
    }
}