105 lines
4.3 KiB
C#
105 lines
4.3 KiB
C#
using System;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.IO;
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using MediaBrowser.Common.Drawing;
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namespace MediaBrowser.Api
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{
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public static class ImageProcessor
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{
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/// <summary>
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/// Resizes an image from a source stream and saves the result to an output stream
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/// </summary>
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/// <param name="width">Use if a fixed width is required. Aspect ratio will be preserved.</param>
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/// <param name="height">Use if a fixed height is required. Aspect ratio will be preserved.</param>
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/// <param name="maxWidth">Use if a max width is required. Aspect ratio will be preserved.</param>
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/// <param name="maxHeight">Use if a max height is required. Aspect ratio will be preserved.</param>
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/// <param name="quality">Quality level, from 0-100. Currently only applies to JPG. The default value should suffice.</param>
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public static void ProcessImage(Stream sourceImageStream, Stream toStream, int? width, int? height, int? maxWidth, int? maxHeight, int? quality)
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{
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Image originalImage = Image.FromStream(sourceImageStream);
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Size newSize = DrawingUtils.Resize(originalImage.Size, width, height, maxWidth, maxHeight);
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Bitmap thumbnail;
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// Graphics.FromImage will throw an exception if the PixelFormat is Indexed, so we need to handle that here
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if (originalImage.PixelFormat.HasFlag(PixelFormat.Indexed))
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{
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thumbnail = new Bitmap(originalImage, newSize.Width, newSize.Height);
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}
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else
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{
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thumbnail = new Bitmap(newSize.Width, newSize.Height, originalImage.PixelFormat);
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}
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thumbnail.SetResolution(originalImage.HorizontalResolution, originalImage.VerticalResolution);
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Graphics thumbnailGraph = Graphics.FromImage(thumbnail);
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thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
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thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
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thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
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thumbnailGraph.PixelOffsetMode = PixelOffsetMode.HighQuality;
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thumbnailGraph.CompositingMode = CompositingMode.SourceOver;
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thumbnailGraph.DrawImage(originalImage, 0, 0, newSize.Width, newSize.Height);
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Write(originalImage, thumbnail, toStream, quality);
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thumbnailGraph.Dispose();
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thumbnail.Dispose();
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originalImage.Dispose();
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}
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private static void Write(Image originalImage, Image newImage, Stream toStream, int? quality)
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{
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// Use special save methods for jpeg and png that will result in a much higher quality image
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// All other formats use the generic Image.Save
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if (ImageFormat.Jpeg.Equals(originalImage.RawFormat))
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{
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SaveJpeg(newImage, toStream, quality);
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}
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else if (ImageFormat.Png.Equals(originalImage.RawFormat))
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{
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newImage.Save(toStream, ImageFormat.Png);
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}
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else
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{
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newImage.Save(toStream, originalImage.RawFormat);
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}
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}
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private static void SaveJpeg(Image newImage, Stream target, int? quality)
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{
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if (!quality.HasValue)
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{
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quality = 90;
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}
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using (var encoderParameters = new EncoderParameters(1))
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{
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encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, quality.Value);
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newImage.Save(target, GetImageCodeInfo("image/jpeg"), encoderParameters);
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}
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}
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private static ImageCodecInfo GetImageCodeInfo(string mimeType)
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{
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ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
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for (int i = 0; i < info.Length; i++)
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{
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ImageCodecInfo ici = info[i];
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if (ici.MimeType.Equals(mimeType, StringComparison.OrdinalIgnoreCase))
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{
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return ici;
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}
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}
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return info[1];
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}
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}
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}
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