kiwiandroiddev

/**
 * Converts a list of bits (booleans) with big-endian ordering to its corresponding
 * integer.
 */
fun List<Boolean>.bigEndianBitsToInt(): Int {
    return reversed().foldIndexed(initial = 0) { bitNo: Int, output: Int, bit: Boolean ->
        output or (bit.toInt() shl bitNo)
    }
}

kiwiandroiddev

/**
 * Uses OpenCV to decode an image that is an android test resource i.e.
 * a file from `src/androidTest/resources`.
 * Note that the resulting Mat will be empty if there was a problem loading the file.
 */
private fun loadOpenCvImage(testResourceFilename: String): Mat {
    val bytes: ByteArray = javaClass.classLoader!!.getResource(testResourceFilename).readBytes()
    val matOfByte = MatOfByte().apply { fromList(bytes.toList()) }
    return Imgcodecs.imdecode(matOfByte, CV_LOAD_IMAGE_COLOR)
}

kiwiandroiddev

/**
 * Removes duplicate consecutive elements in a list, up to maxN duplicate consecutive elements
 * per group.
 * Ex. where maxN = 2:
 * [0, 0, 1, 2, 2, 4, 4, 4, 4] => [0, 1, 2, 4, 4]
 */
fun <T> List<T>.normalize(maxN: Int): List<T> {
    var nextIndexToConsider = 0

    return windowed(size = maxN, step = 1, partialWindows = true)

kiwiandroiddev

fun getScreenCaptureSource(
    screenRectangle: Rectangle,
    numThreads: Int = 6,
    fpsPerThread: Int = 8,
    robot: Robot = Robot()
): Observable<BufferedImage> {
    val periodPerThreadMs: Long = 1000 / fpsPerThread.toLong()
    val perThreadOffsetMs: Long = periodPerThreadMs / numThreads

    val sources = (0 until numThreads).map { i ->