Add thumbnail file creation

2 files changed, 51 insertions, 0 deletions

diff --git a/Services/IImageResizer.cs b/Services/IImageResizer.cs
new file mode 100644
index 0000000..de02893
--- /dev/null
+++ b/Services/IImageResizer.cs
@@ -0,0 +1,8 @@
+namespace MyDarling.Services
+{
+    public interface IImageResizer
+	{
+		public void CreateThumbnail(string filePath);
+		public void DownsizeImage(string filePath);
+	}
+}
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diff --git a/Services/ImageResizer.cs b/Services/ImageResizer.cs
new file mode 100644
index 0000000..53c1eec
--- /dev/null
+++ b/Services/ImageResizer.cs
@@ -0,0 +1,43 @@
+using SkiaSharp;
+
+namespace MyDarling.Services
+{
+    public class ImageResizer : IImageResizer
+	{
+		const int size = 400;
+		const int quality = 75;
+		public void CreateThumbnail(string inputPath)
+		{
+			using var input = File.OpenRead(inputPath);
+			using var inputStream = new SKManagedStream(input);
+			using var original = SKBitmap.Decode(inputStream);
+
+			int width, height;
+			if (original.Width > original.Height)
+			{
+				width = size;
+				height = original.Height * size / original.Width;
+			}
+			else
+			{
+				width = original.Width * size / original.Height;
+				height = size;
+			}
+
+			using var resized = original.Resize(new SKImageInfo(width, height), SKFilterQuality.High);
+			if (resized == null) return;
+
+			using var image = SKImage.FromBitmap(resized);
+			var outputPath = Path.GetDirectoryName(inputPath) + "\\" +
+				Path.GetFileNameWithoutExtension(inputPath) + "_thumb.jpg";
+			using var output = File.OpenWrite(outputPath);
+
+			image.Encode(SKEncodedImageFormat.Jpeg, quality).SaveTo(output);
+		}
+
+		public void DownsizeImage(string filePath)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}
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