fun intrinsicHistogramDot()

in test-app/src/main/java/com/google/android/renderscript_test/IntrinsicHistogram.kt [106:154]
48 lines of code
6 McCabe index (conditional complexity)

fun intrinsicHistogramDot(
    context: RenderScript,
    inputArray: ByteArray,
    vectorSize: Int,
    sizeX: Int,
    sizeY: Int,
    coefficients: FloatArray?,
    restriction: Range2d?
): IntArray {
    val element = renderScriptVectorElementForU8(context, vectorSize)
    val scriptHistogram = ScriptIntrinsicHistogram.create(context, element)
    val builder = Type.Builder(context, element)
    builder.setX(sizeX)
    builder.setY(sizeY)
    val arrayType = builder.create()
    val inputAllocation = Allocation.createTyped(context, arrayType)
    val outAllocation =
        Allocation.createSized(context, Element.I32(context), 256)
    inputAllocation.copyFrom(inputArray)

    if (coefficients != null) {
        require(coefficients.size == vectorSize) {
            "RenderScriptToolkit tests. $vectorSize coefficients are required for histogram. " +
                "${coefficients.size} provided."
        }
        scriptHistogram.setDotCoefficients(
            coefficients[0],
            if (vectorSize > 1) coefficients[1] else 0f,
            if (vectorSize > 2) coefficients[2] else 0f,
            if (vectorSize > 3) coefficients[3] else 0f
        )
    }
    scriptHistogram.setOutput(outAllocation)
    if (restriction != null) {
        val options = Script.LaunchOptions()
        options.setX(restriction.startX, restriction.endX)
        options.setY(restriction.startY, restriction.endY)
        scriptHistogram.forEach_Dot(inputAllocation, options)
    } else {
        scriptHistogram.forEach_Dot(inputAllocation)
    }
    val intrinsicOutArray = IntArray(256)
    outAllocation.copyTo(intrinsicOutArray)
    inputAllocation.destroy()
    outAllocation.destroy()
    arrayType.destroy()
    scriptHistogram.destroy()
    return intrinsicOutArray
}