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76 lines
3.0 KiB
76 lines
3.0 KiB
// <copyright file="DecodedBlockMemento.cs" company="James Jackson-South">
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// Copyright (c) James Jackson-South and contributors.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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namespace ImageSharp.Formats.Jpg
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{
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using System.Buffers;
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/// <summary>
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/// A structure to store unprocessed <see cref="Block8x8F"/> instances and their coordinates while scanning the image.
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/// </summary>
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internal struct DecodedBlockMemento
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{
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/// <summary>
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/// A value indicating whether the <see cref="DecodedBlockMemento"/> instance is initialized.
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/// </summary>
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public bool Initialized;
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/// <summary>
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/// X coordinate of the current block, in units of 8x8. (The third block in the first row has (bx, by) = (2, 0))
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/// </summary>
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public int Bx;
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/// <summary>
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/// Y coordinate of the current block, in units of 8x8. (The third block in the first row has (bx, by) = (2, 0))
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/// </summary>
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public int By;
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/// <summary>
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/// The <see cref="Block8x8F"/>
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/// </summary>
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public Block8x8F Block;
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/// <summary>
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/// The <see cref="ArrayPool{T}"/> used to pool data in <see cref="JpegDecoderCore.DecodedBlocks"/>.
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/// Should always clean arrays when returning!
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/// </summary>
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private static readonly ArrayPool<DecodedBlockMemento> ArrayPool = ArrayPool<DecodedBlockMemento>.Create();
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/// <summary>
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/// Rent an array of <see cref="DecodedBlockMemento"/>-s from the pool.
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/// </summary>
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/// <param name="size">The requested array size</param>
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/// <returns>An array of <see cref="DecodedBlockMemento"/>-s</returns>
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public static DecodedBlockMemento[] RentArray(int size)
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{
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return ArrayPool.Rent(size);
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}
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/// <summary>
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/// Returns the <see cref="DecodedBlockMemento"/> array to the pool.
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/// </summary>
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/// <param name="blockArray">The <see cref="DecodedBlockMemento"/> array</param>
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public static void ReturnArray(DecodedBlockMemento[] blockArray)
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{
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ArrayPool.Return(blockArray, true);
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}
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/// <summary>
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/// Store the block data into a <see cref="DecodedBlockMemento"/> at the given index.
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/// </summary>
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/// <param name="blockArray">The array of <see cref="DecodedBlockMemento"/></param>
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/// <param name="index">The index in the array</param>
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/// <param name="bx">X coordinate of the block</param>
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/// <param name="by">Y coordinate of the block</param>
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/// <param name="block">The <see cref="Block8x8F"/></param>
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public static void Store(DecodedBlockMemento[] blockArray, int index, int bx, int by, ref Block8x8F block)
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{
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blockArray[index].Initialized = true;
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blockArray[index].Bx = bx;
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blockArray[index].By = by;
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blockArray[index].Block = block;
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}
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}
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}
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