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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.LookupTable
import com.google.android.renderscript.Range2d
/**
* Reference implementation of a LookUpTable operation.
*/
@ExperimentalUnsignedTypes
fun referenceLut(
inputArray: ByteArray,
sizeX: Int,
sizeY: Int,
table: LookupTable,
restriction: Range2d?
): ByteArray {
val input = Vector2dArray(inputArray.asUByteArray(), 4, sizeX, sizeY)
val output = input.createSameSized()
input.forEach(restriction) { x, y ->
val oldValue = input[x, y]
val newValue = byteArrayOf(
table.red[oldValue[0].toInt()],
table.green[oldValue[1].toInt()],
table.blue[oldValue[2].toInt()],
table.alpha[oldValue[3].toInt()]
)
output[x, y] = newValue.asUByteArray()
}
return output.values.asByteArray()
}
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