69 lines
2.1 KiB
Kotlin
69 lines
2.1 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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/**
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* Reference implementation of a Convolve operation.
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*/
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@ExperimentalUnsignedTypes
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fun referenceConvolve(
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inputArray: ByteArray,
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vectorSize: Int,
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sizeX: Int,
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sizeY: Int,
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coefficients: FloatArray,
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restriction: Range2d?
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): ByteArray {
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val input = Vector2dArray(inputArray.asUByteArray(), vectorSize, sizeX, sizeY)
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val radius = when (coefficients.size) {
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9 -> 1
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25 -> 2
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else -> {
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throw IllegalArgumentException("RenderScriptToolkit Convolve. Only 3x3 and 5x5 convolutions are supported. ${coefficients.size} coefficients provided.")
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}
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}
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input.clipReadToRange = true
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val output = input.createSameSized()
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input.forEach(restriction) { x, y ->
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output[x, y] = convolveOne(input, x, y, coefficients, radius)
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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 convolveOne(
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inputAlloc: Vector2dArray,
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x: Int,
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y: Int,
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coefficients: FloatArray,
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radius: Int
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): UByteArray {
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var sum = FloatArray(paddedSize(inputAlloc.vectorSize))
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var coefficientIndex = 0
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for (deltaY in -radius..radius) {
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for (deltaX in -radius..radius) {
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val inputVector = inputAlloc[x + deltaX, y + deltaY]
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sum += inputVector.toFloatArray() * coefficients[coefficientIndex]
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coefficientIndex++
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}
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}
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return sum.clampToUByte()
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}
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