899 lines
34 KiB
C#
899 lines
34 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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using System.Buffers;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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#if NETSTANDARD2_1_OR_GREATER
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using CommunityToolkit.HighPerformance.Buffers.Internals;
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#endif
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using CommunityToolkit.HighPerformance.Helpers;
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using CommunityToolkit.HighPerformance.Memory.Internals;
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using CommunityToolkit.HighPerformance.Memory.Views;
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using static CommunityToolkit.HighPerformance.Helpers.Internals.RuntimeHelpers;
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#pragma warning disable CA2231
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namespace CommunityToolkit.HighPerformance;
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/// <summary>
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/// A readonly version of <see cref="Memory2D{T}"/>.
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/// </summary>
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/// <typeparam name="T">The type of items in the current <see cref="ReadOnlyMemory2D{T}"/> instance.</typeparam>
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[DebuggerTypeProxy(typeof(MemoryDebugView2D<>))]
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[DebuggerDisplay("{ToString(),raw}")]
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public readonly struct ReadOnlyMemory2D<T> : IEquatable<ReadOnlyMemory2D<T>>
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{
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/// <summary>
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/// The target <see cref="object"/> instance, if present.
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/// </summary>
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private readonly object? instance;
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/// <summary>
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/// The initial offset within <see cref="instance"/>.
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/// </summary>
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private readonly IntPtr offset;
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/// <summary>
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/// The height of the specified 2D region.
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/// </summary>
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private readonly int height;
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/// <summary>
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/// The width of the specified 2D region.
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/// </summary>
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private readonly int width;
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/// <summary>
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/// The pitch of the specified 2D region.
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/// </summary>
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private readonly int pitch;
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="text">The target <see cref="string"/> to wrap.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <exception cref="ArgumentException">
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/// Thrown when either <paramref name="height"/> or <paramref name="width"/> are invalid.
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/// </exception>
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/// <remarks>The total area must match the length of <paramref name="text"/>.</remarks>
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public ReadOnlyMemory2D(string text, int height, int width)
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: this(text, 0, height, width, 0)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="text">The target <see cref="string"/> to wrap.</param>
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/// <param name="offset">The initial offset within <paramref name="text"/>.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <param name="pitch">The pitch in the resulting 2D area.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when one of the input parameters is out of range.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Thrown when the requested area is outside of bounds for <paramref name="text"/>.
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/// </exception>
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public ReadOnlyMemory2D(string text, int offset, int height, int width, int pitch)
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{
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if ((uint)offset > (uint)text.Length)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForOffset();
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}
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if (height < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
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}
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if (width < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
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}
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if (pitch < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForPitch();
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}
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int area = OverflowHelper.ComputeInt32Area(height, width, pitch);
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int remaining = text.Length - offset;
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if (area > remaining)
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{
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ThrowHelper.ThrowArgumentException();
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}
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this.instance = text;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(text, ref text.DangerousGetReferenceAt(offset));
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this.height = height;
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this.width = width;
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this.pitch = pitch;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="array">The target array to wrap.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <exception cref="ArgumentException">
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/// Thrown when either <paramref name="height"/> or <paramref name="width"/> are invalid.
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/// </exception>
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/// <remarks>The total area must match the length of <paramref name="array"/>.</remarks>
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public ReadOnlyMemory2D(T[] array, int height, int width)
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: this(array, 0, height, width, 0)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="array">The target array to wrap.</param>
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/// <param name="offset">The initial offset within <paramref name="array"/>.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <param name="pitch">The pitch in the resulting 2D area.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when one of the input parameters is out of range.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Thrown when the requested area is outside of bounds for <paramref name="array"/>.
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/// </exception>
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public ReadOnlyMemory2D(T[] array, int offset, int height, int width, int pitch)
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{
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if ((uint)offset > (uint)array.Length)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForOffset();
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}
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if (height < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
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}
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if (width < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
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}
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if (pitch < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForPitch();
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}
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int area = OverflowHelper.ComputeInt32Area(height, width, pitch);
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int remaining = array.Length - offset;
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if (area > remaining)
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{
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ThrowHelper.ThrowArgumentException();
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}
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this.instance = array;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(array, ref array.DangerousGetReferenceAt(offset));
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this.height = height;
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this.width = width;
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this.pitch = pitch;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct wrapping a 2D array.
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/// </summary>
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/// <param name="array">The given 2D array to wrap.</param>
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public ReadOnlyMemory2D(T[,]? array)
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{
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if (array is null)
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{
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this = default;
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return;
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}
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this.instance = array;
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this.offset = GetArray2DDataByteOffset<T>();
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this.height = array.GetLength(0);
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this.width = array.GetLength(1);
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this.pitch = 0;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct wrapping a 2D array.
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/// </summary>
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/// <param name="array">The given 2D array to wrap.</param>
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/// <param name="row">The target row to map within <paramref name="array"/>.</param>
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/// <param name="column">The target column to map within <paramref name="array"/>.</param>
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/// <param name="height">The height to map within <paramref name="array"/>.</param>
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/// <param name="width">The width to map within <paramref name="array"/>.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when either <paramref name="height"/>, <paramref name="width"/> or <paramref name="height"/>
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/// are negative or not within the bounds that are valid for <paramref name="array"/>.
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/// </exception>
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public ReadOnlyMemory2D(T[,]? array, int row, int column, int height, int width)
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{
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if (array is null)
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{
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if (row != 0 || column != 0 || height != 0 || width != 0)
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{
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ThrowHelper.ThrowArgumentException();
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}
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this = default;
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return;
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}
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int rows = array.GetLength(0);
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int columns = array.GetLength(1);
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if ((uint)row >= (uint)rows)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForRow();
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}
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if ((uint)column >= (uint)columns)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForColumn();
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}
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if ((uint)height > (uint)(rows - row))
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
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}
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if ((uint)width > (uint)(columns - column))
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
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}
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this.instance = array;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(array, ref array.DangerousGetReferenceAt(row, column));
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this.height = height;
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this.width = width;
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this.pitch = columns - width;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct wrapping a layer in a 3D array.
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/// </summary>
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/// <param name="array">The given 3D array to wrap.</param>
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/// <param name="depth">The target layer to map within <paramref name="array"/>.</param>
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/// <exception cref="ArgumentOutOfRangeException">Thrown when a parameter is invalid.</exception>
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public ReadOnlyMemory2D(T[,,] array, int depth)
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{
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if ((uint)depth >= (uint)array.GetLength(0))
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForDepth();
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}
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this.instance = array;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(array, ref array.DangerousGetReferenceAt(depth, 0, 0));
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this.height = array.GetLength(1);
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this.width = array.GetLength(2);
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this.pitch = 0;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct wrapping a layer in a 3D array.
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/// </summary>
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/// <param name="array">The given 3D array to wrap.</param>
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/// <param name="depth">The target layer to map within <paramref name="array"/>.</param>
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/// <param name="row">The target row to map within <paramref name="array"/>.</param>
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/// <param name="column">The target column to map within <paramref name="array"/>.</param>
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/// <param name="height">The height to map within <paramref name="array"/>.</param>
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/// <param name="width">The width to map within <paramref name="array"/>.</param>
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/// <exception cref="ArgumentOutOfRangeException">Thrown when a parameter is invalid.</exception>
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public ReadOnlyMemory2D(T[,,] array, int depth, int row, int column, int height, int width)
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{
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if ((uint)depth >= (uint)array.GetLength(0))
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForDepth();
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}
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int rows = array.GetLength(1);
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int columns = array.GetLength(2);
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if ((uint)row >= (uint)rows)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForRow();
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}
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if ((uint)column >= (uint)columns)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForColumn();
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}
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if ((uint)height > (uint)(rows - row))
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
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}
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if ((uint)width > (uint)(columns - column))
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
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}
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this.instance = array;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(array, ref array.DangerousGetReferenceAt(depth, row, column));
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this.height = height;
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this.width = width;
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this.pitch = columns - width;
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}
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#if NETSTANDARD2_1_OR_GREATER
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="memoryManager">The target <see cref="MemoryManager{T}"/> to wrap.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <exception cref="ArgumentException">
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/// Thrown when either <paramref name="height"/> or <paramref name="width"/> are invalid.
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/// </exception>
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/// <remarks>The total area must match the length of <paramref name="memoryManager"/>.</remarks>
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public ReadOnlyMemory2D(MemoryManager<T> memoryManager, int height, int width)
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: this(memoryManager, 0, height, width, 0)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="memoryManager">The target <see cref="MemoryManager{T}"/> to wrap.</param>
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/// <param name="offset">The initial offset within <paramref name="memoryManager"/>.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <param name="pitch">The pitch in the resulting 2D area.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when one of the input parameters is out of range.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Thrown when the requested area is outside of bounds for <paramref name="memoryManager"/>.
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/// </exception>
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public ReadOnlyMemory2D(MemoryManager<T> memoryManager, int offset, int height, int width, int pitch)
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{
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int length = memoryManager.GetSpan().Length;
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if ((uint)offset > (uint)length)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForOffset();
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}
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if (height < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
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}
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if (width < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
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}
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if (pitch < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForPitch();
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}
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if (width == 0 || height == 0)
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{
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this = default;
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return;
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}
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int area = OverflowHelper.ComputeInt32Area(height, width, pitch);
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int remaining = length - offset;
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if (area > remaining)
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{
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ThrowHelper.ThrowArgumentException();
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}
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this.instance = memoryManager;
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this.offset = (nint)(uint)offset;
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this.height = height;
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this.width = width;
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this.pitch = pitch;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="memory">The target <see cref="Memory{T}"/> to wrap.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <exception cref="ArgumentException">
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/// Thrown when either <paramref name="height"/> or <paramref name="width"/> are invalid.
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/// </exception>
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/// <remarks>The total area must match the length of <paramref name="memory"/>.</remarks>
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internal ReadOnlyMemory2D(ReadOnlyMemory<T> memory, int height, int width)
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: this(memory, 0, height, width, 0)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct.
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/// </summary>
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/// <param name="memory">The target <see cref="ReadOnlyMemory{T}"/> to wrap.</param>
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/// <param name="offset">The initial offset within <paramref name="memory"/>.</param>
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/// <param name="height">The height of the resulting 2D area.</param>
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/// <param name="width">The width of each row in the resulting 2D area.</param>
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/// <param name="pitch">The pitch in the resulting 2D area.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown when one of the input parameters is out of range.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// Thrown when the requested area is outside of bounds for <paramref name="memory"/>.
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/// </exception>
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internal ReadOnlyMemory2D(ReadOnlyMemory<T> memory, int offset, int height, int width, int pitch)
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{
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if ((uint)offset > (uint)memory.Length)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForOffset();
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}
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if (height < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
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}
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if (width < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
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}
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if (pitch < 0)
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{
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ThrowHelper.ThrowArgumentOutOfRangeExceptionForPitch();
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}
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if (width == 0 || height == 0)
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{
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this = default;
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return;
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}
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int area = OverflowHelper.ComputeInt32Area(height, width, pitch);
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int remaining = memory.Length - offset;
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if (area > remaining)
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{
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ThrowHelper.ThrowArgumentException();
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}
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// Check the supported underlying objects, like in Memory2D<T>
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if (typeof(T) == typeof(char) &&
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MemoryMarshal.TryGetString(Unsafe.As<ReadOnlyMemory<T>, ReadOnlyMemory<char>>(ref memory), out string? text, out int textStart, out _))
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{
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ref char r0 = ref text.DangerousGetReferenceAt(textStart + offset);
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this.instance = text;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(text, ref r0);
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}
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else if (MemoryMarshal.TryGetArray(memory, out ArraySegment<T> segment))
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{
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T[] array = segment.Array!;
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this.instance = array;
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this.offset = ObjectMarshal.DangerousGetObjectDataByteOffset(array, ref array.DangerousGetReferenceAt(segment.Offset + offset));
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}
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else if (MemoryMarshal.TryGetMemoryManager(memory, out MemoryManager<T>? memoryManager, out int memoryManagerStart, out _))
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{
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this.instance = memoryManager;
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this.offset = (nint)(uint)(memoryManagerStart + offset);
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}
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else
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{
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ThrowHelper.ThrowArgumentExceptionForUnsupportedType();
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this.instance = null;
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this.offset = default;
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}
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this.height = height;
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this.width = width;
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this.pitch = pitch;
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}
|
|
#endif
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the <see cref="ReadOnlyMemory2D{T}"/> struct with the specified parameters.
|
|
/// </summary>
|
|
/// <param name="instance">The target <see cref="object"/> instance.</param>
|
|
/// <param name="offset">The initial offset within <see cref="instance"/>.</param>
|
|
/// <param name="height">The height of the 2D memory area to map.</param>
|
|
/// <param name="width">The width of the 2D memory area to map.</param>
|
|
/// <param name="pitch">The pitch of the 2D memory area to map.</param>
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private ReadOnlyMemory2D(object instance, IntPtr offset, int height, int width, int pitch)
|
|
{
|
|
this.instance = instance;
|
|
this.offset = offset;
|
|
this.height = height;
|
|
this.width = width;
|
|
this.pitch = pitch;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="ReadOnlyMemory2D{T}"/> instance from an arbitrary object.
|
|
/// </summary>
|
|
/// <param name="instance">The <see cref="object"/> instance holding the data to map.</param>
|
|
/// <param name="value">The target reference to point to (it must be within <paramref name="instance"/>).</param>
|
|
/// <param name="height">The height of the 2D memory area to map.</param>
|
|
/// <param name="width">The width of the 2D memory area to map.</param>
|
|
/// <param name="pitch">The pitch of the 2D memory area to map.</param>
|
|
/// <returns>A <see cref="ReadOnlyMemory2D{T}"/> instance with the specified parameters.</returns>
|
|
/// <remarks>The <paramref name="value"/> parameter is not validated, and it's responsibility of the caller to ensure it's valid.</remarks>
|
|
/// <exception cref="ArgumentOutOfRangeException">
|
|
/// Thrown when one of the input parameters is out of range.
|
|
/// </exception>
|
|
public static ReadOnlyMemory2D<T> DangerousCreate(object instance, ref T value, int height, int width, int pitch)
|
|
{
|
|
if (height < 0)
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
|
|
}
|
|
|
|
if (width < 0)
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
|
|
}
|
|
|
|
if (pitch < 0)
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForPitch();
|
|
}
|
|
|
|
OverflowHelper.EnsureIsInNativeIntRange(height, width, pitch);
|
|
|
|
IntPtr offset = ObjectMarshal.DangerousGetObjectDataByteOffset(instance, ref value);
|
|
|
|
return new(instance, offset, height, width, pitch);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets an empty <see cref="ReadOnlyMemory2D{T}"/> instance.
|
|
/// </summary>
|
|
public static ReadOnlyMemory2D<T> Empty => default;
|
|
|
|
/// <summary>
|
|
/// Gets a value indicating whether the current <see cref="ReadOnlyMemory2D{T}"/> instance is empty.
|
|
/// </summary>
|
|
public bool IsEmpty
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
get => this.height == 0 || this.width == 0;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the length of the current <see cref="ReadOnlyMemory2D{T}"/> instance.
|
|
/// </summary>
|
|
public nint Length
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
get => (nint)(uint)this.height * (nint)(uint)this.width;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the height of the underlying 2D memory area.
|
|
/// </summary>
|
|
public int Height
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
get => this.height;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the width of the underlying 2D memory area.
|
|
/// </summary>
|
|
public int Width
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
get => this.width;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets a <see cref="ReadOnlySpan2D{T}"/> instance from the current memory.
|
|
/// </summary>
|
|
public ReadOnlySpan2D<T> Span
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
get
|
|
{
|
|
if (this.instance is not null)
|
|
{
|
|
#if NETSTANDARD2_1_OR_GREATER
|
|
if (this.instance is MemoryManager<T> memoryManager)
|
|
{
|
|
ref T r0 = ref memoryManager.GetSpan().DangerousGetReference();
|
|
ref T r1 = ref Unsafe.Add(ref r0, this.offset);
|
|
|
|
return new(in r1, this.height, this.width, this.pitch);
|
|
}
|
|
else
|
|
{
|
|
// This handles both arrays and strings
|
|
ref T r0 = ref ObjectMarshal.DangerousGetObjectDataReferenceAt<T>(this.instance, this.offset);
|
|
|
|
return new(in r0, this.height, this.width, this.pitch);
|
|
}
|
|
#else
|
|
return new(this.instance, this.offset, this.height, this.width, this.pitch);
|
|
#endif
|
|
}
|
|
|
|
return default;
|
|
}
|
|
}
|
|
|
|
#if NETSTANDARD2_1_OR_GREATER
|
|
/// <summary>
|
|
/// Slices the current instance with the specified parameters.
|
|
/// </summary>
|
|
/// <param name="rows">The target range of rows to select.</param>
|
|
/// <param name="columns">The target range of columns to select.</param>
|
|
/// <exception cref="ArgumentException">
|
|
/// Thrown when either <paramref name="rows"/> or <paramref name="columns"/> are invalid.
|
|
/// </exception>
|
|
/// <returns>A new <see cref="ReadOnlyMemory2D{T}"/> instance representing a slice of the current one.</returns>
|
|
public ReadOnlyMemory2D<T> this[Range rows, Range columns]
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
get
|
|
{
|
|
(int row, int height) = rows.GetOffsetAndLength(this.height);
|
|
(int column, int width) = columns.GetOffsetAndLength(this.width);
|
|
|
|
return Slice(row, column, height, width);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/// <summary>
|
|
/// Slices the current instance with the specified parameters.
|
|
/// </summary>
|
|
/// <param name="row">The target row to map within the current instance.</param>
|
|
/// <param name="column">The target column to map within the current instance.</param>
|
|
/// <param name="height">The height to map within the current instance.</param>
|
|
/// <param name="width">The width to map within the current instance.</param>
|
|
/// <exception cref="ArgumentException">
|
|
/// Thrown when either <paramref name="height"/>, <paramref name="width"/> or <paramref name="height"/>
|
|
/// are negative or not within the bounds that are valid for the current instance.
|
|
/// </exception>
|
|
/// <returns>A new <see cref="ReadOnlyMemory2D{T}"/> instance representing a slice of the current one.</returns>
|
|
public ReadOnlyMemory2D<T> Slice(int row, int column, int height, int width)
|
|
{
|
|
if ((uint)row >= Height)
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForRow();
|
|
}
|
|
|
|
if ((uint)column >= this.width)
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForColumn();
|
|
}
|
|
|
|
if ((uint)height > (Height - row))
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForHeight();
|
|
}
|
|
|
|
if ((uint)width > (this.width - column))
|
|
{
|
|
ThrowHelper.ThrowArgumentOutOfRangeExceptionForWidth();
|
|
}
|
|
|
|
int shift = ((this.width + this.pitch) * row) + column;
|
|
int pitch = this.pitch + (this.width - width);
|
|
|
|
IntPtr offset = this.offset + (shift * Unsafe.SizeOf<T>());
|
|
|
|
return new(this.instance!, offset, height, width, pitch);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Copies the contents of this <see cref="ReadOnlyMemory2D{T}"/> into a destination <see cref="Memory{T}"/> instance.
|
|
/// </summary>
|
|
/// <param name="destination">The destination <see cref="Memory{T}"/> instance.</param>
|
|
/// <exception cref="ArgumentException">
|
|
/// Thrown when <paramref name="destination" /> is shorter than the source <see cref="ReadOnlyMemory2D{T}"/> instance.
|
|
/// </exception>
|
|
public void CopyTo(Memory<T> destination) => Span.CopyTo(destination.Span);
|
|
|
|
/// <summary>
|
|
/// Attempts to copy the current <see cref="ReadOnlyMemory2D{T}"/> instance to a destination <see cref="Memory{T}"/>.
|
|
/// </summary>
|
|
/// <param name="destination">The target <see cref="Memory{T}"/> of the copy operation.</param>
|
|
/// <returns>Whether or not the operation was successful.</returns>
|
|
public bool TryCopyTo(Memory<T> destination) => Span.TryCopyTo(destination.Span);
|
|
|
|
/// <summary>
|
|
/// Copies the contents of this <see cref="ReadOnlyMemory2D{T}"/> into a destination <see cref="Memory2D{T}"/> instance.
|
|
/// For this API to succeed, the target <see cref="Memory2D{T}"/> has to have the same shape as the current one.
|
|
/// </summary>
|
|
/// <param name="destination">The destination <see cref="Memory2D{T}"/> instance.</param>
|
|
/// <exception cref="ArgumentException">
|
|
/// Thrown when <paramref name="destination" /> is shorter than the source <see cref="ReadOnlyMemory2D{T}"/> instance.
|
|
/// </exception>
|
|
public void CopyTo(Memory2D<T> destination) => Span.CopyTo(destination.Span);
|
|
|
|
/// <summary>
|
|
/// Attempts to copy the current <see cref="ReadOnlyMemory2D{T}"/> instance to a destination <see cref="Memory2D{T}"/>.
|
|
/// For this API to succeed, the target <see cref="Memory2D{T}"/> has to have the same shape as the current one.
|
|
/// </summary>
|
|
/// <param name="destination">The target <see cref="Memory2D{T}"/> of the copy operation.</param>
|
|
/// <returns>Whether or not the operation was successful.</returns>
|
|
public bool TryCopyTo(Memory2D<T> destination) => Span.TryCopyTo(destination.Span);
|
|
|
|
/// <summary>
|
|
/// Creates a handle for the memory.
|
|
/// The GC will not move the memory until the returned <see cref="MemoryHandle"/>
|
|
/// is disposed, enabling taking and using the memory's address.
|
|
/// </summary>
|
|
/// <exception cref="ArgumentException">
|
|
/// An instance with non-primitive (non-blittable) members cannot be pinned.
|
|
/// </exception>
|
|
/// <returns>A <see cref="MemoryHandle"/> instance wrapping the pinned handle.</returns>
|
|
public unsafe MemoryHandle Pin()
|
|
{
|
|
if (this.instance is not null)
|
|
{
|
|
if (this.instance is MemoryManager<T> memoryManager)
|
|
{
|
|
return memoryManager.Pin();
|
|
}
|
|
|
|
GCHandle handle = GCHandle.Alloc(this.instance, GCHandleType.Pinned);
|
|
|
|
void* pointer = Unsafe.AsPointer(ref ObjectMarshal.DangerousGetObjectDataReferenceAt<T>(this.instance, this.offset));
|
|
|
|
return new(pointer, handle);
|
|
}
|
|
|
|
return default;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Tries to get a <see cref="ReadOnlyMemory{T}"/> instance, if the underlying buffer is contiguous and small enough.
|
|
/// </summary>
|
|
/// <param name="memory">The resulting <see cref="ReadOnlyMemory{T}"/>, in case of success.</param>
|
|
/// <returns>Whether or not <paramref name="memory"/> was correctly assigned.</returns>
|
|
public bool TryGetMemory(out ReadOnlyMemory<T> memory)
|
|
{
|
|
if (this.pitch == 0 &&
|
|
Length <= int.MaxValue)
|
|
{
|
|
// Empty Memory2D<T> instance
|
|
if (this.instance is null)
|
|
{
|
|
memory = default;
|
|
}
|
|
else if (typeof(T) == typeof(char) && this.instance.GetType() == typeof(string))
|
|
{
|
|
// Here we need to create a Memory<char> from the wrapped string, and to do so we need to do an inverse
|
|
// lookup to find the initial index of the string with respect to the byte offset we're currently using,
|
|
// which refers to the raw string object data. This can include variable padding or other additional
|
|
// fields on different runtimes. The lookup operation is still O(1) and just computes the byte offset
|
|
// difference between the start of the Span<char> (which directly wraps just the actual character data
|
|
// within the string), and the input reference, which we can get from the byte offset in use. The result
|
|
// is the character index which we can use to create the final Memory<char> instance.
|
|
string text = Unsafe.As<string>(this.instance)!;
|
|
int index = text.AsSpan().IndexOf(in ObjectMarshal.DangerousGetObjectDataReferenceAt<char>(text, this.offset));
|
|
ReadOnlyMemory<char> temp = text.AsMemory(index, (int)Length);
|
|
|
|
memory = Unsafe.As<ReadOnlyMemory<char>, ReadOnlyMemory<T>>(ref temp);
|
|
}
|
|
else if (this.instance is MemoryManager<T> memoryManager)
|
|
{
|
|
// If the object is a MemoryManager<T>, just slice it as needed
|
|
memory = memoryManager.Memory.Slice((int)(nint)this.offset, this.height * this.width);
|
|
}
|
|
else if (this.instance.GetType() == typeof(T[]))
|
|
{
|
|
// If it's a T[] array, also handle the initial offset
|
|
T[] array = Unsafe.As<T[]>(this.instance)!;
|
|
int index = array.AsSpan().IndexOf(ref ObjectMarshal.DangerousGetObjectDataReferenceAt<T>(array, this.offset));
|
|
|
|
memory = array.AsMemory(index, this.height * this.width);
|
|
}
|
|
#if NETSTANDARD2_1_OR_GREATER
|
|
else if (this.instance.GetType() == typeof(T[,]) ||
|
|
this.instance.GetType() == typeof(T[,,]))
|
|
{
|
|
memory = new RawObjectMemoryManager<T>(this.instance, this.offset, this.height * this.width).Memory;
|
|
}
|
|
#endif
|
|
else
|
|
{
|
|
// Reuse a single failure path to reduce
|
|
// the number of returns in the method
|
|
goto Failure;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
Failure:
|
|
|
|
memory = default;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Copies the contents of the current <see cref="ReadOnlyMemory2D{T}"/> instance into a new 2D array.
|
|
/// </summary>
|
|
/// <returns>A 2D array containing the data in the current <see cref="ReadOnlyMemory2D{T}"/> instance.</returns>
|
|
public T[,] ToArray() => Span.ToArray();
|
|
|
|
/// <inheritdoc/>
|
|
[EditorBrowsable(EditorBrowsableState.Never)]
|
|
public override bool Equals(object? obj)
|
|
{
|
|
if (obj is ReadOnlyMemory2D<T> readOnlyMemory)
|
|
{
|
|
return Equals(readOnlyMemory);
|
|
}
|
|
|
|
if (obj is Memory2D<T> memory)
|
|
{
|
|
return Equals(memory);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public bool Equals(ReadOnlyMemory2D<T> other)
|
|
{
|
|
return
|
|
this.instance == other.instance &&
|
|
this.offset == other.offset &&
|
|
this.height == other.height &&
|
|
this.width == other.width &&
|
|
this.pitch == other.pitch;
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
[EditorBrowsable(EditorBrowsableState.Never)]
|
|
public override int GetHashCode()
|
|
{
|
|
if (this.instance is not null)
|
|
{
|
|
return HashCode.Combine(
|
|
RuntimeHelpers.GetHashCode(this.instance),
|
|
this.offset,
|
|
this.height,
|
|
this.width,
|
|
this.pitch);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public override string ToString()
|
|
{
|
|
return $"CommunityToolkit.HighPerformance.ReadOnlyMemory2D<{typeof(T)}>[{this.height}, {this.width}]";
|
|
}
|
|
|
|
/// <summary>
|
|
/// Defines an implicit conversion of an array to a <see cref="ReadOnlyMemory2D{T}"/>
|
|
/// </summary>
|
|
public static implicit operator ReadOnlyMemory2D<T>(T[,]? array) => new(array);
|
|
|
|
/// <summary>
|
|
/// Defines an implicit conversion of a <see cref="Memory2D{T}"/> to a <see cref="ReadOnlyMemory2D{T}"/>
|
|
/// </summary>
|
|
public static implicit operator ReadOnlyMemory2D<T>(Memory2D<T> memory) => Unsafe.As<Memory2D<T>, ReadOnlyMemory2D<T>>(ref memory);
|
|
}
|