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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.renderscript_test
import com.google.android.renderscript.Range2d
/**
* Reference implementation of a Histogram operation.
*
* Return an array of 4 * 256 ints.
* Position 0 is the number of R with a value of 0,
* Position 1 is the number of G with a value of 0,
* Position 2 is the number of B with a value of 0,
* Position 3 is the number of A with a value of 0,
* Position 4 is the number of R with a value of 1,
* etc.
*/
@ExperimentalUnsignedTypes
fun referenceHistogram(
inputArray: ByteArray,
vectorSize: Int,
sizeX: Int,
sizeY: Int,
restriction: Range2d?
): IntArray {
val input = Vector2dArray(inputArray.asUByteArray(), vectorSize, sizeX, sizeY)
val counts = IntArray(paddedSize(input.vectorSize) * 256)
input.forEach(restriction) { x, y ->
val value = input[x, y]
for (i in 0 until vectorSize) {
counts[value[i].toInt() * paddedSize(input.vectorSize) + i]++
}
}
return counts
}
/**
* Reference implementation of a HistogramDot operation.
*
* Each RGBA input value is dot-multiplied first by the specified coefficients.
* The resulting value is converted to an integer and used for the histogram.
*/
@ExperimentalUnsignedTypes
fun referenceHistogramDot(
inputArray: ByteArray,
vectorSize: Int,
sizeX: Int,
sizeY: Int,
coefficients: FloatArray?,
restriction: Range2d?
): IntArray {
val floatCoefficients = coefficients ?: floatArrayOf(0.299f, 0.587f, 0.114f, 0f)
val input = Vector2dArray(inputArray.asUByteArray(), vectorSize, sizeX, sizeY)
var coefficientSum = 0f
for (c in floatCoefficients) {
require (c >= 0) {
"RenderScriptToolkit histogramDot. Coefficients must be positive. $c provided."
}
coefficientSum += c
}
require(coefficientSum <= 1f) { "RenderScriptToolkit histogramDot. Coefficients should " +
"add to 1.0 or less. $coefficientSum provided." }
// Compute integer
val intCoefficients = IntArray(input.vectorSize) { (floatCoefficients[it] * 256f + 0.5f).toInt() }
val counts = IntArray(256)
input.forEach(restriction) { x, y ->
val value = input[x, y]
// While we could do the computation using floats, we won't get the same results as
// the existing intrinsics.
var sum = 0
// We don't use value.indices because we want to accumulate only 3 values, in the case
// of vectorSize == 3.
for (i in 0 until vectorSize) {
sum += intCoefficients[i] * value[i].toInt()
}
// Round up and normalize
val index = (sum + 0x7f) shr 8
counts[index]++
}
return counts
}
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