Can OverlayEffect be used together with CameraEffect?

[Hong Wang (LazyIonEs)]

Can OverlayEffect be used together with CameraEffect?  They have common targets, for example,  Use PREVIEW or VIDEO_CAPTURE together. I used these two at the same time and the camera cannot be turned on. What should I do?

```

userCaseBuilder.addEffect(CameraEffect)

userCaseBuilder.addEffect(OverlayEffect)

```

[Xi Zhang (张熹)]

The CameraEffect API, by design, is a hook for inserting code. So it doesn't support chaining by nature. 

However, it's not difficult to create a CameraEffect that composites multiple CameraEffect implementations. Pseudo code:

SurfaceProsessor {
   val wrappedProcessor1
   val wrappedProcessor2
   onInputSurface(surfaceRequest) {
      // 1. send surfaceRequest to wrapperProcessor1
      // 2. create a SurfaceOutput that mimic the surfaceRequest and send to wrapperProcessor1
      // 3. create a second surfaceRequest and send to wrappedProcessor2
   } 
    onOutpuSurface(surfaceOutput) {
       // send surfaceOutput to wrappedProcessor2
    }
}

The challenging part is calculating the transformation needed in step2.  This might be a useful feature for the CameraX team to build in camera-effects. Adding Scott to triage.

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[Hong Wang (LazyIonEs)]

OK, I understand, I'll try it.