1743136 - Delay layerization of transforms caused by active children

Status: NEW

(Core :: Graphics: WebRender, enhancement)

Description

[Jeff Muizelaar [:jrmuizel]]

Given the following:

<svg>
  <rect></rect>
  <g transform>
    <rect></rect>
    <rect will-change: transform></rect>
  </g>
</svg>

We currently end up with 3 layers. The inner will-change:transform forces the outer transform to be active. However, we don't need to actually do this, we can flatten second rect into the first layer and not add the active transform until we get to the actual child that's active.