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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 ColorMatrix operation.
*/
@ExperimentalUnsignedTypes
fun referenceColorMatrix(inputArray: ByteArray,
inputVectorSize: Int,
sizeX: Int,
sizeY: Int,
outputVectorSize: Int,
matrix: FloatArray, addVector: FloatArray,
restriction: Range2d?): ByteArray {
require (matrix.size == 16) { "RenderScriptToolkit colorMatrix. Matrix should have 16 values. ${matrix.size} provided." }
val input = Vector2dArray(inputArray.asUByteArray(), inputVectorSize, sizeX, sizeY)
val outputArray = ByteArray(sizeX * sizeY * paddedSize(outputVectorSize))
val output = Vector2dArray(outputArray.asUByteArray(), outputVectorSize, sizeX, sizeY)
output.forEach (restriction) { x, y ->
val inUByteValue = input[x, y]
val inFloatValue = FloatArray(4) { if (it >= inputVectorSize) 0f else byteToUnitFloat(inUByteValue[it]) }
val outFloatValue = multiplyAndAdd(matrix, inFloatValue, addVector)
val outUByteValue = UByteArray(paddedSize(output.vectorSize)) { unitFloatClampedToUByte(outFloatValue[it]) }
output[x, y] = outUByteValue
}
return outputArray
}
private fun multiplyAndAdd(matrix: FloatArray, inVector: FloatArray, addVector: FloatArray): FloatArray {
// In RenderScript, matrix were set in column major format
val result = addVector.clone()
for (i in 0..3) {
for (j in 0..3) {
result[i] += matrix[j * 4 + i] * inVector[j]
}
}
return result
}
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