69 lines
2.4 KiB
C#
69 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using Umbraco.Core;
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using Umbraco.Core.Configuration;
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using Umbraco.Core.Configuration.UmbracoSettings;
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using Umbraco.Core.IO;
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using Umbraco.Core.Media;
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using Umbraco.Core.Models;
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using Umbraco.Web.Composing;
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using Umbraco.Web.Media.Exif;
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namespace Umbraco.Web.Media
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{
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public static class ImageHelper
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{
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/// <summary>
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/// Gets the dimensions of an image.
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/// </summary>
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/// <param name="stream">A stream containing the image bytes.</param>
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/// <returns>The dimension of the image.</returns>
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/// <remarks>First try with EXIF as it is faster and does not load the entire image
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/// in memory. Fallback to GDI which means loading the image in memory and thus
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/// use potentially large amounts of memory.</remarks>
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public static Size GetDimensions(Stream stream)
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{
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try
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{
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//Try to load with exif
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var jpgInfo = ImageFile.FromStream(stream);
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if (jpgInfo.Format != ImageFileFormat.Unknown
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&& jpgInfo.Properties.ContainsKey(ExifTag.PixelYDimension)
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&& jpgInfo.Properties.ContainsKey(ExifTag.PixelXDimension))
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{
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var height = Convert.ToInt32(jpgInfo.Properties[ExifTag.PixelYDimension].Value);
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var width = Convert.ToInt32(jpgInfo.Properties[ExifTag.PixelXDimension].Value);
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if (height > 0 && width > 0)
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{
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return new Size(width, height);
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}
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}
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//we have no choice but to try to read in via GDI
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using (var image = Image.FromStream(stream))
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{
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var fileWidth = image.Width;
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var fileHeight = image.Height;
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return new Size(fileWidth, fileHeight);
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}
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}
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catch (Exception)
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{
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//We will just swallow, just means we can't read exif data, we don't want to log an error either
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return new Size(Constants.Conventions.Media.DefaultSize, Constants.Conventions.Media.DefaultSize);
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}
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}
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}
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}
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