About Mirrors the cover behaviour from CSS in After Effects. Applied expressions on scale and position parameters make the layer cover parents bounding box. Don't forget to parent!
Preview VIDEO
IMG layer: position -- CODE language-js --
// Target Bounding Box
pBB = parent.sourceRectAtTime(time,true)
pW = pBB.width;
pH = pBB.height;
pL = pBB.left;
pT = pBB.top;
[pL+pW/2,pT+pH/2];
IMG layer: scale -- CODE language-js --
// Target Bounding Box
pBB = parent.sourceRectAtTime(time,true);
pW = pBB.width;
pH = pBB.height;
// Layer Bounding Box
lBB = thisLayer.sourceRectAtTime(time,true);
lW = lBB.width;
lH = lBB.height;
// IMG AspectRatio
aR = thisLayer.width/thisLayer.height;
if(pW/pH>=aR) {
[pW/lW,pW/lW]*100
} else {
[pH/lH,pH/lH]*100
}
