68 lines
2.1 KiB
C#
68 lines
2.1 KiB
C#
using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.Metadata.Profiles.Exif;
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using Umbraco.Cms.Core.Media;
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using Size = System.Drawing.Size;
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namespace Umbraco.Cms.Imaging.ImageSharp.Media;
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public sealed class ImageSharpDimensionExtractor : IImageDimensionExtractor
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{
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private readonly Configuration _configuration;
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/// <inheritdoc />
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public IEnumerable<string> SupportedImageFileTypes { get; }
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/// <summary>
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/// Initializes a new instance of the <see cref="ImageSharpDimensionExtractor" /> class.
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/// </summary>
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/// <param name="configuration">The configuration.</param>
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public ImageSharpDimensionExtractor(Configuration configuration)
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{
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_configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
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SupportedImageFileTypes = configuration.ImageFormats.SelectMany(f => f.FileExtensions).ToArray();
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}
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/// <inheritdoc />
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public Size? GetDimensions(Stream? stream)
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{
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Size? size = null;
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IImageInfo imageInfo = Image.Identify(_configuration, stream);
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if (imageInfo != null)
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{
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size = IsExifOrientationRotated(imageInfo)
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? new Size(imageInfo.Height, imageInfo.Width)
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: new Size(imageInfo.Width, imageInfo.Height);
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}
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return size;
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}
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private static bool IsExifOrientationRotated(IImageInfo imageInfo)
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=> GetExifOrientation(imageInfo) switch
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{
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ExifOrientationMode.LeftTop
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or ExifOrientationMode.RightTop
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or ExifOrientationMode.RightBottom
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or ExifOrientationMode.LeftBottom => true,
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_ => false,
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};
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private static ushort GetExifOrientation(IImageInfo imageInfo)
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{
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IExifValue<ushort>? orientation = imageInfo.Metadata.ExifProfile?.GetValue(ExifTag.Orientation);
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if (orientation is not null)
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{
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if (orientation.DataType == ExifDataType.Short)
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{
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return orientation.Value;
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}
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return Convert.ToUInt16(orientation.Value);
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}
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return ExifOrientationMode.Unknown;
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}
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}
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