1 <layers>

     2     <visual src="item" />

     3     <filter name="brightness_contrast" type="brightness_contrast">

     4         <param name="opacity">1.0</param>

     5         <param name="brightness" type="anim">

     6             <duration>0.4</duration>

     7             <style>inoutquad</style>

     8             <keyframe at="0.0">0</keyframe>

     9             <keyframe at="0.2">0.8</keyframe>

    10             <keyframe at="1.0">0</keyframe>

    11         </param>

    12         <param name="contrast">1.0</param>

    13     </filter>

    14 </layers>