Merge pull request #231 from Marv51/load-from-imagesharp

Add option to create ImageSource directly from ImageSharp image

Author: ststeiger

PdfSharpCore.Test/CreateSimplePDF.cs

@@ -5,6 +5,10 @@
 using PdfSharpCore.Drawing;
 using PdfSharpCore.Pdf;
 using PdfSharpCore.Test.Helpers;
+using PdfSharpCore.Utils;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Processing;
 using Xunit;
 
 namespace PdfSharpCore.Test
@@ -51,6 +55,32 @@ public void CreateTestPdfWithImage()
             ReadStreamAndVerifyPdfHeaderSignature(stream);
         }
 
+        [Fact]
+        public void CreateTestPdfWithImageViaImageSharp()
+        {
+            using var stream = new MemoryStream();
+            var document = new PdfDocument();
+
+            var pageNewRenderer = document.AddPage();
+
+            var renderer = XGraphics.FromPdfPage(pageNewRenderer);
+
+            // Load image for ImageSharp and apply a simple mutation:
+            var image = Image.Load<Rgb24>(PathHelper.GetInstance().GetAssetPath("lenna.png"), out var format);
+            image.Mutate(ctx => ctx.Grayscale());
+
+            // create XImage from that same ImageSharp image:
+            var source = ImageSharpImageSource<Rgb24>.FromImageSharpImage(image, format);
+            var img = XImage.FromImageSource(source);
+
+            renderer.DrawImage(img, new XPoint(0, 0));
+
+            document.Save(stream);
+            stream.Position = 0;
+            Assert.True(stream.Length > 1);
+            ReadStreamAndVerifyPdfHeaderSignature(stream);
+        }
+
         private void SaveDocument(PdfDocument document, string name)
         {
             var outFilePath = GetOutFilePath(name);

PdfSharpCore/Utils/ImageSharpImageSource.cs

@@ -12,6 +12,13 @@ namespace PdfSharpCore.Utils
 {
     public class ImageSharpImageSource<TPixel> : ImageSource where TPixel : unmanaged, IPixel<TPixel>
     {
+
+        public static IImageSource FromImageSharpImage(Image<TPixel> image, IImageFormat imgFormat, int? quality = 75)
+        {
+            var _path = "*" + Guid.NewGuid().ToString("B");
+            return new ImageSharpImageSourceImpl<TPixel>(_path, image, (int)quality, imgFormat is PngFormat);
+        }
+
         protected override IImageSource FromBinaryImpl(string name, Func<byte[]> imageSource, int? quality = 75)
         {
             var image = Image.Load<TPixel>(imageSource.Invoke(), out IImageFormat imgFormat);