mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
8 years ago
20 changed files with 203 additions and 369 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.Collections.Generic; |
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namespace SixLabors.ImageSharp.Formats.Jpeg.GolangPort |
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{ |
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/// <summary>
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/// Defines jpeg constants defined in the specification.
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/// </summary>
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internal static class OrigJpegConstants |
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{ |
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/// <summary>
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/// The maximum allowable length in each dimension of a jpeg image.
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/// </summary>
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public const ushort MaxLength = 65535; |
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/// <summary>
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/// The list of mimetypes that equate to a jpeg.
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/// </summary>
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public static readonly IEnumerable<string> MimeTypes = new[] { "image/jpeg", "image/pjpeg" }; |
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/// <summary>
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/// The list of file extensions that equate to a jpeg.
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/// </summary>
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public static readonly IEnumerable<string> FileExtensions = new[] { "jpg", "jpeg", "jfif" }; |
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/// <summary>
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/// Describes common Jpeg markers
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/// </summary>
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internal static class Markers |
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{ |
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/// <summary>
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/// Marker prefix. Next byte is a marker.
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/// </summary>
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public const byte XFF = 0xff; |
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/// <summary>
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/// Same as <see cref="XFF"/> but of type <see cref="int"/>
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/// </summary>
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public const int XFFInt = XFF; |
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/// <summary>
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/// Start of Image
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/// </summary>
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public const byte SOI = 0xd8; |
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/// <summary>
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/// Start of Frame (baseline DCT)
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/// <remarks>
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/// Indicates that this is a baseline DCT-based JPEG, and specifies the width, height, number of components,
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/// and component subsampling (e.g., 4:2:0).
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/// </remarks>
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/// </summary>
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public const byte SOF0 = 0xc0; |
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/// <summary>
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/// Start Of Frame (Extended Sequential DCT)
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/// <remarks>
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/// Indicates that this is a progressive DCT-based JPEG, and specifies the width, height, number of components,
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/// and component subsampling (e.g., 4:2:0).
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/// </remarks>
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/// </summary>
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public const byte SOF1 = 0xc1; |
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/// <summary>
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/// Start Of Frame (progressive DCT)
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/// <remarks>
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/// Indicates that this is a progressive DCT-based JPEG, and specifies the width, height, number of components,
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/// and component subsampling (e.g., 4:2:0).
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/// </remarks>
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/// </summary>
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public const byte SOF2 = 0xc2; |
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/// <summary>
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/// Define Huffman Table(s)
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/// <remarks>
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/// Specifies one or more Huffman tables.
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/// </remarks>
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/// </summary>
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public const byte DHT = 0xc4; |
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/// <summary>
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/// Define Quantization Table(s)
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/// <remarks>
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/// Specifies one or more quantization tables.
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/// </remarks>
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/// </summary>
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public const byte DQT = 0xdb; |
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/// <summary>
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/// Define Restart Interval
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/// <remarks>
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/// Specifies the interval between RSTn markers, in macroblocks. This marker is followed by two bytes
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/// indicating the fixed size so it can be treated like any other variable size segment.
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/// </remarks>
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/// </summary>
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public const byte DRI = 0xdd; |
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/// <summary>
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/// Define First Restart
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/// <remarks>
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/// Inserted every r macroblocks, where r is the restart interval set by a DRI marker.
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/// Not used if there was no DRI marker. The low three bits of the marker code cycle in value from 0 to 7.
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/// </remarks>
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/// </summary>
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public const byte RST0 = 0xd0; |
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/// <summary>
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/// Define Eigth Restart
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/// <remarks>
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/// Inserted every r macroblocks, where r is the restart interval set by a DRI marker.
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/// Not used if there was no DRI marker. The low three bits of the marker code cycle in value from 0 to 7.
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/// </remarks>
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/// </summary>
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public const byte RST7 = 0xd7; |
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/// <summary>
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/// Start of Scan
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/// <remarks>
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/// Begins a top-to-bottom scan of the image. In baseline DCT JPEG images, there is generally a single scan.
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/// Progressive DCT JPEG images usually contain multiple scans. This marker specifies which slice of data it
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/// will contain, and is immediately followed by entropy-coded data.
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/// </remarks>
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/// </summary>
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public const byte SOS = 0xda; |
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/// <summary>
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/// Comment
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/// <remarks>
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/// Contains a text comment.
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/// </remarks>
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/// </summary>
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public const byte COM = 0xfe; |
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/// <summary>
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/// End of Image
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/// </summary>
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public const byte EOI = 0xd9; |
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/// <summary>
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/// Application specific marker for marking the jpeg format.
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/// <see href="http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html"/>
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/// </summary>
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public const byte APP0 = 0xe0; |
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/// <summary>
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/// Application specific marker for marking where to store metadata.
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/// </summary>
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public const byte APP1 = 0xe1; |
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/// <summary>
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/// Application specific marker for marking where to store ICC profile information.
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/// </summary>
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public const byte APP2 = 0xe2; |
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/// <summary>
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/// Application specific marker used by Adobe for storing encoding information for DCT filters.
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/// </summary>
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public const byte APP14 = 0xee; |
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/// <summary>
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/// Application specific marker used by GraphicConverter to store JPEG quality.
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/// </summary>
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public const byte APP15 = 0xef; |
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} |
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/// <summary>
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/// Describes Adobe specific markers <see href="http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe"/>
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/// </summary>
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internal static class Adobe |
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{ |
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/// <summary>
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/// The color transform is unknown.(RGB or CMYK)
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/// </summary>
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public const int ColorTransformUnknown = 0; |
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/// <summary>
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/// The color transform is YCbCr (luminance, red chroma, blue chroma)
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/// </summary>
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public const int ColorTransformYCbCr = 1; |
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/// <summary>
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/// The color transform is YCCK (luminance, red chroma, blue chroma, keyline)
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/// </summary>
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public const int ColorTransformYcck = 2; |
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} |
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} |
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} |
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