et));
      float2 isInterior =
          step(1.9999, normalizedToEdgeLRFB.xz + normalizedToEdgeLRFB.yw);
      float2 coverage =
          mix(max(pixelsToEdge.xz + pixelsToEdge.yw - float2(1.0), 0.0),
              float2(1.0), isInterior);
      return coverage.x * coverage.y;
    }