Bug Reporting

When set value
` gpuImage = GPUImage(requireContext())
gpuImage.setGLSurfaceView(bindingActivity.ivGpu)
gpuImage.setBackgroundColor(0f,255f,255f)
gpuImage.setScaleType(GPUImage.ScaleType.CENTER_INSIDE)
gpuImage.setImage(originBitmap)

    val filter = GPUImageGaussianBlurFilter()
    gpuImage.setFilter(filter)`

The background is always black, when no filter is used, GLSurfaceView automatically crop the image for it, but when any filter is set, GLSurfaceView will replace the blank color as black