75 lines
2.8 KiB
Kotlin
75 lines
2.8 KiB
Kotlin
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.testapp
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import android.renderscript.toolkit.Range2d
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import android.renderscript.toolkit.Rgba3dArray
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/**
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* Reference implementation of a 3D LookUpTable operation.
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*/
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@ExperimentalUnsignedTypes
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fun referenceLut3d(
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inputArray: ByteArray,
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sizeX: Int,
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sizeY: Int,
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cube: Rgba3dArray,
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restriction: Range2d?
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): ByteArray {
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val input = Vector2dArray(inputArray.asUByteArray(), 4, sizeX, sizeY)
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val output = input.createSameSized()
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input.forEach(restriction) { x, y ->
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output[x, y] = lookup(input[x, y], cube)
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}
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return output.values.asByteArray()
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}
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@ExperimentalUnsignedTypes
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private fun lookup(input: UByteArray, cube: Rgba3dArray): UByteArray {
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// Calculate the two points at opposite edges of the size 1
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// cube that contains our point.
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val maxIndex = Int4(cube.sizeX - 1, cube.sizeY - 1, cube.sizeZ - 1, 0)
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val baseCoordinate: Float4 = input.toFloat4() * maxIndex.toFloat4() / 255f
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val point1: Int4 = baseCoordinate.intFloor()
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val point2: Int4 = min(point1 + 1, maxIndex)
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val fractionAwayFromPoint1: Float4 = baseCoordinate - point1.toFloat4()
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// Get the RGBA values at each of the four corners of the size 1 cube.
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val v000 = cube[point1.x, point1.y, point1.z].toFloat4()
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val v100 = cube[point2.x, point1.y, point1.z].toFloat4()
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val v010 = cube[point1.x, point2.y, point1.z].toFloat4()
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val v110 = cube[point2.x, point2.y, point1.z].toFloat4()
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val v001 = cube[point1.x, point1.y, point2.z].toFloat4()
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val v101 = cube[point2.x, point1.y, point2.z].toFloat4()
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val v011 = cube[point1.x, point2.y, point2.z].toFloat4()
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val v111 = cube[point2.x, point2.y, point2.z].toFloat4()
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// Do the linear mixing of these eight values.
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val yz00 = mix(v000, v100, fractionAwayFromPoint1.x)
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val yz10 = mix(v010, v110, fractionAwayFromPoint1.x)
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val yz01 = mix(v001, v101, fractionAwayFromPoint1.x)
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val yz11 = mix(v011, v111, fractionAwayFromPoint1.x)
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val z0 = mix(yz00, yz10, fractionAwayFromPoint1.y)
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val z1 = mix(yz01, yz11, fractionAwayFromPoint1.y)
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val v = mix(z0, z1, fractionAwayFromPoint1.z)
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// Preserve the alpha of the original value
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return ubyteArrayOf(v.x.clampToUByte(), v.y.clampToUByte(), v.z.clampToUByte(), input[3])
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}
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