/**
 * Abstract class for background, eye overlay and eye classes.
 * @class AbstractLayer
 * @extends PIXI.Container
 * @memberof jibo.face
 * @param {Boolean} cache `true` to cache textures.
 */

    /**
     * If should update according to DOFValues.
     * @name jibo.face.AbstractLayer#connected
     * @type {String}
     */

    /**
     * `true` if layer has been initialized.
     * @name jibo.face.AbstractLayer#initialized
     * @type {String}
     * @protected
     */

    /**
     * Current cached timestamp.
     * @name jibo.face.AbstractLayer#timestamp
     * @type {Number[]}
     * @protected
     */

    /**
     * Current cached dofValues.
     * @name jibo.face.AbstractLayer#dofValues
     * @type {Number[]}
     * @protected
     */

    /**
     * Empty placeholder texture.
     * @name jibo.face.AbstractLayer#_defaultTexture
     * @type {PIXI.Texture}
     * @private
     */

    /**
     * Reference to the current texture.
     * @name jibo.face.AbstractLayer#_texture
     * @type {PIXI.Texture}
     * @private
     */

    /**
     * Current path of the texture loaded/loading.
     * @name jibo.face.AbstractLayer#_texturePath
     * @type {String}
     * @private
     */

    /**
     * The current asset loading
     * @name jibo.face.AbstractLayer#_load
     * @type {jibo.loader.AssetLoad}
     * @private
     */

    /**
     * The cache key of the texture currently in use.
     * @name jibo.face.AbstractLayer#_textureCacheKey
     * @type {jibo.loader.AssetToken}
     * @private
     */

    /**
     * Default eye texture when nothing is set.
     * @method jibo.face.AbstractLayer#reset
     * @param {Boolean} [resetPath=true] `false` to ignore resetting default path
     */

    /**
     * Default eye texture when nothing is set.
     * @method jibo.face.AbstractLayer#init
     * @param {PIXI.Texture} texture The default texture to use
     */

    /**
     * Display of DOFValues.
     * @method jibo.face.AbstractLayer#display
     * @param {Array<Number>} timestamp Timestamp when update is called.
     * @param {jibo.face.DOFValues} dofValues Update display according to these values.
     * @return {Boolean} `true` proceeds with update.
     */

    /**
     * Full path to the texture to use.
     * @name jibo.face.AbstractLayer#texturePath
     * @type {String}
     */

    /**
     * Destroy and don't use after this.
     * @method jibo.face.AbstractLayer#destroy
     */

    /**
     * Set current eye texture.
     * @method jibo.face.AbstractLayer#setTexture
     * @param {PIXI.Texture} texture Texture to set.
     * @override
     */

    /**
     * Value to tint.
     * @method jibo.face.AbstractLayer#rgb2hex
     * @protected
     * @param {Number} red Red value from 0 to 1
     * @param {Number} green Green value from 0 to 1
     * @param {Number} blue Blue value from 0 to 1
     * @return {int} The resulting uint color
     */

    /**
     * Check to see a path matches the default texture.
     * @method jibo.face.AbstractLayer#_isDefaultTexture
     * @param {PIXI.Texture} texture The default texture.
     * @param {String} value Full path to test.
     * @return {Boolean} `true` if the value is the default texture.
     * @private
     */

    /**
     * If there's a current load happen, stop it.
     * @method jibo.face.AbstractLayer#_cancelLoad
     * @private
     */

    /**
     * Set the current texture path.
     * @method jibo.face.AbstractLayer#_applyTexture
     * @param {String} value Path to the texture
     * @private
     */

    /**
     * Set the current texture path.
     * @method jibo.face.AbstractLayer#_loadTexture
     * @param {String} value Path to the texture
     * @private
     */