mirror of https://github.com/SixLabors/ImageSharp
antonfirsov
9 years ago
6 changed files with 222 additions and 221 deletions
@ -1,101 +0,0 @@ |
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// <copyright file="GrayImage.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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/// <summary>
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/// Represents a grayscale image
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/// </summary>
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internal class GrayImage |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="GrayImage"/> class.
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/// </summary>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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public GrayImage(int width, int height) |
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{ |
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this.Width = width; |
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this.Height = height; |
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this.Pixels = new byte[width * height]; |
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this.Stride = width; |
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this.Offset = 0; |
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} |
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/// <summary>
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/// Prevents a default instance of the <see cref="GrayImage"/> class from being created.
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/// </summary>
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private GrayImage() |
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{ |
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} |
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/// <summary>
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/// Gets or sets the pixels.
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/// </summary>
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public byte[] Pixels { get; set; } |
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/// <summary>
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/// Gets or sets the stride.
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/// </summary>
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public int Stride { get; set; } |
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/// <summary>
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/// Gets or sets the horizontal position.
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/// </summary>
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public int X { get; set; } |
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/// <summary>
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/// Gets or sets the vertical position.
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/// </summary>
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public int Y { get; set; } |
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/// <summary>
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/// Gets or sets the width.
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/// </summary>
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public int Width { get; set; } |
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/// <summary>
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/// Gets or sets the height.
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/// </summary>
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public int Height { get; set; } |
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/// <summary>
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/// Gets or sets the offset
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/// </summary>
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public int Offset { get; set; } |
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/// <summary>
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/// Gets an image made up of a subset of the originals pixels.
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/// </summary>
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/// <param name="x">The x-coordinate of the image.</param>
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/// <param name="y">The y-coordinate of the image.</param>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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/// <returns>
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/// The <see cref="GrayImage"/>.
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/// </returns>
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public GrayImage Subimage(int x, int y, int width, int height) |
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{ |
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return new GrayImage |
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{ |
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Width = width, |
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Height = height, |
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Pixels = this.Pixels, |
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Stride = this.Stride, |
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Offset = (y * this.Stride) + x |
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}; |
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} |
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/// <summary>
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/// Gets the row offset at the given position
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/// </summary>
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/// <param name="y">The y-coordinate of the image.</param>
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/// <returns>The <see cref="int"/></returns>
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public int GetRowOffset(int y) |
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{ |
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return this.Offset + (y * this.Stride); |
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} |
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} |
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} |
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@ -0,0 +1,116 @@ |
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// <copyright file="JpegChannelArea.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; |
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using System.Buffers; |
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using System.Runtime.CompilerServices; |
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/// <summary>
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/// Represents a grayscale image
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/// </summary>
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internal struct JpegPixelArea |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="JpegPixelArea" /> class.
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/// </summary>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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public static JpegPixelArea CreatePooled(int width, int height) |
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{ |
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int size = width * height; |
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//var pixels = ArrayPool<byte>.Shared.Rent(size);
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//Array.Clear(pixels, 0, size);
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var pixels = ArrayPoolManager<byte>.RentCleanArray(size); |
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return new JpegPixelArea(pixels, width, 0); |
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} |
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public JpegPixelArea(byte[] pixels, int widthOrStride, int offset) |
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{ |
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this.Stride = widthOrStride; |
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this.Pixels = pixels; |
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this.Offset = offset; |
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} |
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public void ReturnPooled() |
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{ |
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if (this.Pixels == null) return; |
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ArrayPoolManager<byte>.ReturnArray(this.Pixels); |
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this.Pixels = null; |
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} |
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/// <summary>
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/// Gets or sets the pixels.
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/// </summary>
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public byte[] Pixels { get; private set; } |
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public bool Created => this.Pixels != null; |
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/// <summary>
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/// Gets or sets the width.
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/// </summary>
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public int Stride { get; private set; } |
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/// <summary>
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/// Gets or sets the offset
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/// </summary>
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public int Offset { get; private set; } |
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/// <summary>
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/// Gets an image made up of a subset of the originals pixels.
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/// </summary>
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/// <param name="x">The x-coordinate of the image.</param>
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/// <param name="y">The y-coordinate of the image.</param>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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/// <returns>
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/// The <see cref="JpegPixelArea"/>.
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/// </returns>
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public JpegPixelArea Subimage(int x, int y, int width, int height) |
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{ |
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return new JpegPixelArea |
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{ |
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Stride = width, |
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Pixels = this.Pixels, |
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Offset = (y * this.Stride) + x |
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}; |
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} |
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/// <summary>
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/// Get the subarea that belongs to the given block indices
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/// </summary>
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/// <param name="bx">The block X index</param>
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/// <param name="by">The block Y index</param>
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/// <returns></returns>
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public JpegPixelArea GetOffsetedAreaForBlock(int bx, int by) |
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{ |
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int offset = this.Offset + 8 * (by * this.Stride + bx); |
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return new JpegPixelArea(this.Pixels, this.Stride, offset); |
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} |
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public byte this[int x, int y] => this.Pixels[y * this.Stride + x]; |
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/// <summary>
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/// Gets the row offset at the given position
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/// </summary>
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/// <param name="y">The y-coordinate of the image.</param>
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/// <returns>The <see cref="int"/></returns>
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public int GetRowOffset(int y) |
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{ |
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return this.Offset + (y * this.Stride); |
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} |
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public MutableSpan<byte> Span => new MutableSpan<byte>(this.Pixels, this.Offset); |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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public unsafe void LoadColorsFrom(Block8x8F* block, Block8x8F* temp) |
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{ |
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// Level shift by +128, clip to [0, 255], and write to dst.
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block->CopyColorsTo(new MutableSpan<byte>(this.Pixels, this.Offset), this.Stride, temp); |
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} |
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} |
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} |
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@ -0,0 +1,13 @@ |
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namespace ImageSharp.Formats |
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{ |
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using System.Buffers; |
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internal class ArrayPoolManager<T> |
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{ |
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private static readonly ArrayPool<T> Pool = ArrayPool<T>.Create(); |
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public static T[] RentCleanArray(int minimumLength) => Pool.Rent(minimumLength); |
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public static void ReturnArray(T[] array) => Pool.Return(array, true); |
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} |
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} |
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