mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
8 years ago
committed by
GitHub
GitHub
79 changed files with 1188 additions and 505 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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namespace SixLabors.ImageSharp.Formats.Bmp |
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{ |
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/// <summary>
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/// Provides Bmp specific metadata information for the image.
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/// </summary>
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public class BmpMetaData |
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{ |
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/// <summary>
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/// Gets or sets the number of bits per pixel.
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/// </summary>
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public BmpBitsPerPixel BitsPerPixel { get; set; } = BmpBitsPerPixel.Pixel24; |
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// TODO: Colors used once we support encoding palette bmps.
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} |
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} |
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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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namespace SixLabors.ImageSharp.Formats.Gif |
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{ |
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/// <summary>
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/// Provides Gif specific metadata information for the image frame.
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/// </summary>
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public class GifFrameMetaData |
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{ |
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/// <summary>
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/// Gets or sets the length of the color table for paletted images.
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/// If not 0, then this field indicates the maximum number of colors to use when quantizing the
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/// image frame.
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/// </summary>
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public int ColorTableLength { get; set; } |
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/// <summary>
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/// Gets or sets the frame delay for animated images.
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/// If not 0, when utilized in Gif animation, this field specifies the number of hundredths (1/100) of a second to
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/// wait before continuing with the processing of the Data Stream.
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/// The clock starts ticking immediately after the graphic is rendered.
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/// </summary>
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public int FrameDelay { get; set; } |
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/// <summary>
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/// Gets or sets the disposal method for animated images.
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/// Primarily used in Gif animation, this field indicates the way in which the graphic is to
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/// be treated after being displayed.
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/// </summary>
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public GifDisposalMethod DisposalMethod { get; set; } |
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} |
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} |
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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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namespace SixLabors.ImageSharp.Formats.Gif |
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{ |
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/// <summary>
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/// Provides Gif specific metadata information for the image.
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/// </summary>
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public class GifMetaData |
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{ |
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/// <summary>
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/// Gets or sets the number of times any animation is repeated.
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/// <remarks>
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/// 0 means to repeat indefinitely, count is set as play n + 1 times
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/// </remarks>
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/// </summary>
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public ushort RepeatCount { get; set; } |
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/// <summary>
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/// Gets or sets the color table mode.
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/// </summary>
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public GifColorTableMode ColorTableMode { get; set; } |
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/// <summary>
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/// Gets or sets the length of the global color table if present.
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/// </summary>
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public int GlobalColorTableLength { get; set; } |
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} |
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} |
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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; |
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using System.Buffers.Binary; |
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namespace SixLabors.ImageSharp.Formats.Gif |
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{ |
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internal readonly struct GifNetscapeLoopingApplicationExtension : IGifExtension |
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{ |
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public GifNetscapeLoopingApplicationExtension(ushort repeatCount) => this.RepeatCount = repeatCount; |
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public byte Label => GifConstants.ApplicationExtensionLabel; |
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/// <summary>
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/// Gets the repeat count.
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/// 0 means loop indefinitely. Count is set as play n + 1 times.
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/// </summary>
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public ushort RepeatCount { get; } |
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public static GifNetscapeLoopingApplicationExtension Parse(ReadOnlySpan<byte> buffer) |
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{ |
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ushort repeatCount = BinaryPrimitives.ReadUInt16LittleEndian(buffer.Slice(0, 2)); |
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return new GifNetscapeLoopingApplicationExtension(repeatCount); |
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} |
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public int WriteTo(Span<byte> buffer) |
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{ |
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buffer[0] = GifConstants.ApplicationBlockSize; |
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// Write NETSCAPE2.0
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GifConstants.NetscapeApplicationIdentificationBytes.AsSpan().CopyTo(buffer.Slice(1, 11)); |
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// Application Data ----
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buffer[12] = 3; // Application block length (always 3)
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buffer[13] = 1; // Data sub-block indentity (always 1)
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// 0 means loop indefinitely. Count is set as play n + 1 times.
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BinaryPrimitives.WriteUInt16LittleEndian(buffer.Slice(14, 2), this.RepeatCount); |
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return 16; // Length - Introducer + Label + Terminator.
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} |
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} |
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} |
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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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namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder |
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{ |
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/// <summary>
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/// Provides methods to evaluate the quality of an image.
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/// Ported from <see href="https://github.com/ImageMagick/ImageMagick/blob/f362c02083d27211b913c6e44794f0ac6edaf2bd/coders/jpeg.c#L855"/>
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/// </summary>
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internal static class QualityEvaluator |
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{ |
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private static readonly int[] Hash = new int[101] |
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{ |
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1020, 1015, 932, 848, 780, 735, 702, 679, 660, 645, |
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632, 623, 613, 607, 600, 594, 589, 585, 581, 571, |
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555, 542, 529, 514, 494, 474, 457, 439, 424, 410, |
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397, 386, 373, 364, 351, 341, 334, 324, 317, 309, |
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299, 294, 287, 279, 274, 267, 262, 257, 251, 247, |
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243, 237, 232, 227, 222, 217, 213, 207, 202, 198, |
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192, 188, 183, 177, 173, 168, 163, 157, 153, 148, |
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143, 139, 132, 128, 125, 119, 115, 108, 104, 99, |
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94, 90, 84, 79, 74, 70, 64, 59, 55, 49, |
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45, 40, 34, 30, 25, 20, 15, 11, 6, 4, |
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0 |
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}; |
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private static readonly int[] Sums = new int[101] |
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{ |
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32640, 32635, 32266, 31495, 30665, 29804, 29146, 28599, 28104, |
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27670, 27225, 26725, 26210, 25716, 25240, 24789, 24373, 23946, |
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23572, 22846, 21801, 20842, 19949, 19121, 18386, 17651, 16998, |
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16349, 15800, 15247, 14783, 14321, 13859, 13535, 13081, 12702, |
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12423, 12056, 11779, 11513, 11135, 10955, 10676, 10392, 10208, |
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9928, 9747, 9564, 9369, 9193, 9017, 8822, 8639, 8458, |
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8270, 8084, 7896, 7710, 7527, 7347, 7156, 6977, 6788, |
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6607, 6422, 6236, 6054, 5867, 5684, 5495, 5305, 5128, |
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4945, 4751, 4638, 4442, 4248, 4065, 3888, 3698, 3509, |
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3326, 3139, 2957, 2775, 2586, 2405, 2216, 2037, 1846, |
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1666, 1483, 1297, 1109, 927, 735, 554, 375, 201, |
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128, 0 |
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}; |
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private static readonly int[] Hash1 = new int[101] |
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{ |
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510, 505, 422, 380, 355, 338, 326, 318, 311, 305, |
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300, 297, 293, 291, 288, 286, 284, 283, 281, 280, |
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279, 278, 277, 273, 262, 251, 243, 233, 225, 218, |
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211, 205, 198, 193, 186, 181, 177, 172, 168, 164, |
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158, 156, 152, 148, 145, 142, 139, 136, 133, 131, |
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129, 126, 123, 120, 118, 115, 113, 110, 107, 105, |
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102, 100, 97, 94, 92, 89, 87, 83, 81, 79, |
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76, 74, 70, 68, 66, 63, 61, 57, 55, 52, |
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50, 48, 44, 42, 39, 37, 34, 31, 29, 26, |
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24, 21, 18, 16, 13, 11, 8, 6, 3, 2, |
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0 |
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}; |
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private static readonly int[] Sums1 = new int[101] |
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{ |
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16320, 16315, 15946, 15277, 14655, 14073, 13623, 13230, 12859, |
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12560, 12240, 11861, 11456, 11081, 10714, 10360, 10027, 9679, |
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9368, 9056, 8680, 8331, 7995, 7668, 7376, 7084, 6823, |
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6562, 6345, 6125, 5939, 5756, 5571, 5421, 5240, 5086, |
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4976, 4829, 4719, 4616, 4463, 4393, 4280, 4166, 4092, |
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3980, 3909, 3835, 3755, 3688, 3621, 3541, 3467, 3396, |
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3323, 3247, 3170, 3096, 3021, 2952, 2874, 2804, 2727, |
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2657, 2583, 2509, 2437, 2362, 2290, 2211, 2136, 2068, |
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1996, 1915, 1858, 1773, 1692, 1620, 1552, 1477, 1398, |
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1326, 1251, 1179, 1109, 1031, 961, 884, 814, 736, |
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667, 592, 518, 441, 369, 292, 221, 151, 86, |
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64, 0 |
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}; |
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/// <summary>
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/// Returns an estimated quality of the image based on the quantization tables.
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/// </summary>
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/// <param name="quantizationTables">The quantization tables.</param>
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/// <returns>The <see cref="int"/>.</returns>
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public static int EstimateQuality(Block8x8F[] quantizationTables) |
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{ |
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int quality = 75; |
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float sum = 0; |
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for (int i = 0; i < quantizationTables.Length; i++) |
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{ |
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ref Block8x8F qTable = ref quantizationTables[i]; |
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for (int j = 0; j < Block8x8F.Size; j++) |
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{ |
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sum += qTable[j]; |
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} |
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} |
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ref Block8x8F qTable0 = ref quantizationTables[0]; |
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ref Block8x8F qTable1 = ref quantizationTables[1]; |
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if (!qTable0.Equals(default)) |
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{ |
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if (!qTable1.Equals(default)) |
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{ |
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quality = (int)(qTable0[2] |
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+ qTable0[53] |
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+ qTable1[0] |
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+ qTable1[Block8x8F.Size - 1]); |
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for (int i = 0; i < 100; i++) |
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{ |
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if (quality < Hash[i] && sum < Sums[i]) |
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{ |
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continue; |
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} |
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if (((quality <= Hash[i]) && (sum <= Sums[i])) || (i >= 50)) |
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{ |
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return i + 1; |
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} |
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} |
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} |
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else |
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{ |
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quality = (int)(qTable0[2] + qTable0[53]); |
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for (int i = 0; i < 100; i++) |
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{ |
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if (quality < Hash1[i] && sum < Sums1[i]) |
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{ |
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continue; |
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} |
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if (((quality <= Hash1[i]) && (sum <= Sums1[i])) || (i >= 50)) |
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{ |
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return i + 1; |
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} |
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} |
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} |
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} |
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return quality; |
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} |
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} |
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} |
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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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namespace SixLabors.ImageSharp.Formats.Jpeg |
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{ |
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/// <summary>
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/// Provides Jpeg specific metadata information for the image.
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/// </summary>
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public class JpegMetaData |
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{ |
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/// <summary>
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/// Gets or sets the encoded quality.
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/// </summary>
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public int Quality { get; set; } = 75; |
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} |
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} |
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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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namespace SixLabors.ImageSharp.Formats.Png |
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{ |
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/// <summary>
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/// Provides Png specific metadata information for the image.
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/// </summary>
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public class PngMetaData |
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{ |
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/// <summary>
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/// Gets or sets the number of bits per sample or per palette index (not per pixel).
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/// Not all values are allowed for all <see cref="ColorType"/> values.
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/// </summary>
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public PngBitDepth BitDepth { get; set; } = PngBitDepth.Bit8; |
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/// <summary>
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/// Gets or sets the color type.
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/// </summary>
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public PngColorType ColorType { get; set; } = PngColorType.RgbWithAlpha; |
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/// <summary>
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/// Gets or sets the gamma value for the image.
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/// </summary>
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public float Gamma { get; set; } |
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} |
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} |
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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 SixLabors.ImageSharp.Formats; |
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using SixLabors.ImageSharp.Formats.Bmp; |
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using SixLabors.ImageSharp.Formats.Gif; |
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using SixLabors.ImageSharp.Formats.Jpeg; |
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using SixLabors.ImageSharp.Formats.Png; |
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namespace SixLabors.ImageSharp |
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{ |
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/// <summary>
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/// The static collection of all the default image formats
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/// </summary>
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public static class ImageFormats |
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{ |
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/// <summary>
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/// The format details for the jpegs.
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/// </summary>
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public static readonly IImageFormat Jpeg = new JpegFormat(); |
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/// <summary>
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/// The format details for the pngs.
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/// </summary>
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public static readonly IImageFormat Png = new PngFormat(); |
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/// <summary>
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/// The format details for the gifs.
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/// </summary>
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public static readonly IImageFormat Gif = new GifFormat(); |
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/// <summary>
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/// The format details for the bitmaps.
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/// </summary>
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public static readonly IImageFormat Bmp = new BmpFormat(); |
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} |
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} |
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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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namespace SixLabors.ImageSharp.Formats.Gif |
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namespace SixLabors.ImageSharp.MetaData |
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{ |
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/// <summary>
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/// Enumerated frame process modes to apply to multi-frame images.
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After Width: | Height: | Size: 32 KiB |
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After Width: | Height: | Size: 444 KiB |
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