mirror of https://github.com/SixLabors/ImageSharp
Anton Firszov
9 years ago
8 changed files with 128 additions and 230 deletions
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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using System.Runtime.CompilerServices; |
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namespace SixLabors.ImageSharp.Formats.Jpeg.GolangPort.Utils |
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{ |
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/// <summary>
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/// Like corefxlab Span, but with an AddOffset() method for efficiency.
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/// TODO: When Span will be official, consider replacing this class!
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/// </summary>
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/// <see>
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/// <cref>https://github.com/dotnet/corefxlab/blob/master/src/System.Slices/System/Span.cs</cref>
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/// </see>
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/// <typeparam name="T">The type of the data in the span</typeparam>
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internal struct MutableSpan<T> |
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{ |
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/// <summary>
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/// Data
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/// </summary>
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public T[] Data; |
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/// <summary>
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/// Offset
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/// </summary>
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public int Offset; |
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/// <summary>
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/// Initializes a new instance of the <see cref="MutableSpan{T}"/> struct.
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/// </summary>
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/// <param name="size">The size of the span</param>
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/// <param name="offset">The offset (defaults to 0)</param>
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public MutableSpan(int size, int offset = 0) |
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{ |
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this.Data = new T[size]; |
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this.Offset = offset; |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="MutableSpan{T}"/> struct.
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/// </summary>
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/// <param name="data">The data</param>
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/// <param name="offset">The offset (defaults to 0)</param>
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public MutableSpan(T[] data, int offset = 0) |
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{ |
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this.Data = data; |
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this.Offset = offset; |
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} |
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/// <summary>
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/// Gets the total count of data
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/// </summary>
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public int TotalCount => this.Data.Length - this.Offset; |
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/// <summary>
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/// Index into the data
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/// </summary>
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/// <param name="idx">The data</param>
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/// <returns>The value at the specified index</returns>
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public T this[int idx] |
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{ |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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get |
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{ |
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return this.Data[idx + this.Offset]; |
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} |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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set |
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{ |
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this.Data[idx + this.Offset] = value; |
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} |
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} |
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public static implicit operator MutableSpan<T>(T[] data) => new MutableSpan<T>(data, 0); |
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/// <summary>
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/// Slice the data
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/// </summary>
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/// <param name="offset">The offset</param>
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/// <returns>The new <see cref="MutableSpan{T}"/></returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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public MutableSpan<T> Slice(int offset) |
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{ |
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return new MutableSpan<T>(this.Data, this.Offset + offset); |
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} |
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/// <summary>
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/// Add to the offset
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/// </summary>
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/// <param name="offset">The additional offset</param>
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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public void AddOffset(int offset) |
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{ |
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this.Offset += offset; |
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} |
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} |
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} |
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