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86 lines
3.0 KiB
86 lines
3.0 KiB
// <copyright file="AutoOrient.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
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{
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using System;
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using Processing;
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/// <summary>
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/// Extension methods for the <see cref="Image{TColor}"/> type.
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/// </summary>
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public static partial class ImageExtensions
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{
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/// <summary>
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/// Adjusts an image so that its orientation is suitable for viewing. Adjustments are based on EXIF metadata embedded in the image.
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/// </summary>
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/// <typeparam name="TColor">The pixel format.</typeparam>
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/// <param name="source">The image to auto rotate.</param>
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/// <returns>The <see cref="Image"/></returns>
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public static Image<TColor> AutoOrient<TColor>(this Image<TColor> source)
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where TColor : struct, IPackedPixel, IEquatable<TColor>
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{
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Orientation orientation = GetExifOrientation(source);
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switch (orientation)
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{
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case Orientation.TopRight:
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return source.Flip(FlipType.Horizontal);
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case Orientation.BottomRight:
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return source.Rotate(RotateType.Rotate180);
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case Orientation.BottomLeft:
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return source.Flip(FlipType.Vertical);
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case Orientation.LeftTop:
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return source.Rotate(RotateType.Rotate90)
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.Flip(FlipType.Horizontal);
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case Orientation.RightTop:
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return source.Rotate(RotateType.Rotate90);
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case Orientation.RightBottom:
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return source.Flip(FlipType.Vertical)
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.Rotate(RotateType.Rotate270);
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case Orientation.LeftBottom:
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return source.Rotate(RotateType.Rotate270);
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case Orientation.Unknown:
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case Orientation.TopLeft:
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default:
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return source;
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}
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}
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/// <summary>
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/// Returns the current EXIF orientation
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/// </summary>
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/// <typeparam name="TColor">The pixel format.</typeparam>
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/// <param name="source">The image to auto rotate.</param>
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/// <returns>The <see cref="Orientation"/></returns>
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private static Orientation GetExifOrientation<TColor>(Image<TColor> source)
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where TColor : struct, IPackedPixel, IEquatable<TColor>
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{
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if (source.ExifProfile == null)
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{
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return Orientation.Unknown;
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}
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ExifValue value = source.ExifProfile.GetValue(ExifTag.Orientation);
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if (value == null)
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{
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return Orientation.Unknown;
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}
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Orientation orientation = (Orientation)value.Value;
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source.ExifProfile.SetValue(ExifTag.Orientation, (ushort)Orientation.TopLeft);
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return orientation;
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}
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}
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}
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