Postprocessor for Facebook's Fresco library that combines few postprocessors

CombinePostProcessors.kt

import android.graphics.Bitmap
import com.facebook.common.references.CloseableReference
import com.facebook.imagepipeline.bitmaps.PlatformBitmapFactory
import com.facebook.imagepipeline.request.BasePostprocessor


class CombinePostProcessors(
    private val processors: List<BasePostprocessor>
) : BasePostprocessor() {

    override fun process(
        sourceBitmap: Bitmap,
        bitmapFactory: PlatformBitmapFactory
    ): CloseableReference<Bitmap> {
        var result: CloseableReference<Bitmap>? = null
        for (processor in processors) {
            val src = result?.get() ?: sourceBitmap
            result = processor.process(src, bitmapFactory)
        }
        return result ?: with(bitmapFactory.createBitmap(sourceBitmap)) {
            try {
                CloseableReference.cloneOrNull(this)!!
            } finally {
                CloseableReference.closeSafely(this)
            }
        }
    }

}