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69 lines
2.7 KiB
69 lines
2.7 KiB
// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="BmpCompression.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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// <summary>
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// Defines how the compression type of the image data
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// in the bitmap file.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Formats
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{
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/// <summary>
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/// Defines how the compression type of the image data
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/// in the bitmap file.
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/// </summary>
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internal enum BmpCompression
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{
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/// <summary>
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/// Each image row has a multiple of four elements. If the
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/// row has less elements, zeros will be added at the right side.
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/// The format depends on the number of bits, stored in the info header.
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/// If the number of bits are one, four or eight each pixel data is
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/// a index to the palette. If the number of bits are sixteen,
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/// twenty-four or thirty-two each pixel contains a color.
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/// </summary>
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RGB = 0,
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/// <summary>
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/// Two bytes are one data record. If the first byte is not zero, the
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/// next two half bytes will be repeated as much as the value of the first byte.
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/// If the first byte is zero, the record has different meanings, depending
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/// on the second byte. If the second byte is zero, it is the end of the row,
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/// if it is one, it is the end of the image.
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/// Not supported at the moment.
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/// </summary>
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RLE8 = 1,
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/// <summary>
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/// Two bytes are one data record. If the first byte is not zero, the
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/// next byte will be repeated as much as the value of the first byte.
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/// If the first byte is zero, the record has different meanings, depending
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/// on the second byte. If the second byte is zero, it is the end of the row,
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/// if it is one, it is the end of the image.
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/// Not supported at the moment.
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/// </summary>
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RLE4 = 2,
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/// <summary>
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/// Each image row has a multiple of four elements. If the
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/// row has less elements, zeros will be added at the right side.
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/// Not supported at the moment.
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/// </summary>
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BitFields = 3,
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/// <summary>
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/// The bitmap contains a JPG image.
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/// Not supported at the moment.
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/// </summary>
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JPEG = 4,
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/// <summary>
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/// The bitmap contains a PNG image.
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/// Not supported at the moment.
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/// </summary>
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PNG = 5
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}
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}
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