ReferencePngDecoder

tests/ImageSharp.Tests/TestUtilities/Integration/ReferenceEncoder.cs → tests/ImageSharp.Sandbox46/Tests/TestUtilities/Integration/ReferencePngEncoder.cs

@@ -9,13 +9,17 @@ namespace ImageSharp.Tests.TestUtilities.Integration
     using ImageSharp.Formats;
     using ImageSharp.PixelFormats;
 
-    public class ReferenceEncoder : IImageEncoder
+    public class ReferencePngEncoder : IImageEncoder
     {
+        public static ReferencePngEncoder Instance { get; } = new ReferencePngEncoder();
+
         public void Encode<TPixel>(Image<TPixel> image, Stream stream, IEncoderOptions options)
             where TPixel : struct, IPixel<TPixel>
         {
-            System.Drawing.Bitmap sdBitmap = IntegrationTestUtils.ToSystemDrawingBitmap(image);
-            throw new NotImplementedException();
+            using (System.Drawing.Bitmap sdBitmap = IntegrationTestUtils.ToSystemDrawingBitmap(image))
+            {
+                sdBitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
+            }
         }
     }
 }

tests/ImageSharp.Tests/TestUtilities/Integration/IntegrationTestUtils.cs

@@ -29,6 +29,60 @@
             }
         }
 
+        private static void FromArgb32<TPixel>(Span<Argb32> source, Span<TPixel> dest)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            int length = source.Length;
+            Guard.MustBeSizedAtLeast(dest, length, nameof(dest));
+
+            using (var rgbaBuffer = new Buffer<Rgba32>(length))
+            {
+                PixelOperations<Argb32>.Instance.ToRgba32(source, rgbaBuffer, length);
+
+                for (int i = 0; i < length; i++)
+                {
+                    ref Rgba32 s = ref rgbaBuffer[i];
+                    ref TPixel d = ref dest[i];
+
+                    d.PackFromRgba32(s);
+                }
+            }
+        }
+
+        internal static unsafe Image<TPixel> FromSystemDrawingBitmap<TPixel>(System.Drawing.Bitmap bmp)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            int w = bmp.Width;
+            int h = bmp.Height;
+
+            var fullRect = new System.Drawing.Rectangle(0, 0, w, h);
+
+            BitmapData data = bmp.LockBits(fullRect, ImageLockMode.ReadWrite, bmp.PixelFormat);
+            byte* sourcePtrBase = (byte*)data.Scan0;
+
+            long sourceRowByteCount = data.Stride;
+            long destRowByteCount = w * sizeof(Argb32);
+
+            var image = new Image<TPixel>(w, h);
+
+            using (var workBuffer = new Buffer<Argb32>(w))
+            {
+                var destPtr = (Argb32*)workBuffer.Pin();
+                for (int y = 0; y < h; y++)
+                {
+                    Span<TPixel> row = image.GetRowSpan(y);
+                    
+                    byte* sourcePtr = sourcePtrBase + data.Stride * y;
+
+                    Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
+
+                    FromArgb32(workBuffer, row);
+                }
+            }
+
+            return image;
+        }
+
         internal static unsafe System.Drawing.Bitmap ToSystemDrawingBitmap<TPixel>(Image<TPixel> image)
             where TPixel : struct, IPixel<TPixel>
         {

tests/ImageSharp.Tests/TestUtilities/Integration/ReferencePngDecoder.cs

@@ -0,0 +1,31 @@
+namespace ImageSharp.Tests.TestUtilities.Integration
+{
+    using System;
+    using System.IO;
+
+    using ImageSharp.Formats;
+    using ImageSharp.PixelFormats;
+
+    public class ReferencePngDecoder : IImageDecoder
+    {
+        public static ReferencePngDecoder Instance { get; } = new ReferencePngDecoder();
+
+        public Image<TPixel> Decode<TPixel>(Configuration configuration, Stream stream, IDecoderOptions options)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            using (var sdBitmap = new System.Drawing.Bitmap(stream))
+            {
+                if (!sdBitmap.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Png))
+                {
+                    throw new Exception("Reference image should be a Png!");
+                }
+                if (sdBitmap.PixelFormat != System.Drawing.Imaging.PixelFormat.Format32bppArgb)
+                {
+                    throw new Exception("Reference image pixel format should be PixelFormat.Format32bppArgb!");
+                }
+
+                return IntegrationTestUtils.FromSystemDrawingBitmap<TPixel>(sdBitmap);
+            }
+        }
+    }
+}

tests/ImageSharp.Tests/TestUtilities/Integration/ReferencePngEncoder.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+using System.Text;
+
+namespace ImageSharp.Tests.TestUtilities.Integration
+{
+    using System.IO;
+
+    using ImageSharp.Formats;
+    using ImageSharp.PixelFormats;
+
+    public class ReferencePngEncoder : IImageEncoder
+    {
+        public static ReferencePngEncoder Instance { get; } = new ReferencePngEncoder();
+
+        public void Encode<TPixel>(Image<TPixel> image, Stream stream, IEncoderOptions options)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            using (System.Drawing.Bitmap sdBitmap = IntegrationTestUtils.ToSystemDrawingBitmap(image))
+            {
+                sdBitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
+            }
+        }
+    }
+}

tests/ImageSharp.Tests/TestUtilities/Tests/IntegrationTestUtilsTests.cs

@@ -29,5 +29,44 @@ namespace ImageSharp.Tests
                 }
             }
         }
+
+        [Theory]
+        [WithBlankImages(1, 1, PixelTypes.Rgba32 | PixelTypes.Bgra32)]
+        public void FromSystemDrawingBitmap<TPixel>(TestImageProvider<TPixel> dummyProvider)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            string path = TestFile.GetPath(TestImages.Png.Splash);
+
+            using (var sdBitmap = new System.Drawing.Bitmap(path))
+            {
+                using (Image<TPixel> image = IntegrationTestUtils.FromSystemDrawingBitmap<TPixel>(sdBitmap))
+                {
+                    image.DebugSave(dummyProvider);
+                }
+            }
+        }
+
+        [Theory]
+        [WithBlankImages(1, 1, PixelTypes.Rgba32 | PixelTypes.Bgra32)]
+        public void OpenWithReferenceDecoder<TPixel>(TestImageProvider<TPixel> dummyProvider)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            string path = TestFile.GetPath(TestImages.Png.Splash);
+            using (Image<TPixel> image = Image.Load<TPixel>(path, ReferencePngDecoder.Instance))
+            {
+                image.DebugSave(dummyProvider);
+            }
+        }
+
+        [Theory]
+        [WithTestPatternImages(20, 20, PixelTypes.Rgba32 | PixelTypes.Argb32)]
+        public void SaveWithReferenceEncoder<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                provider.Utility.SaveTestOutputFile(image, "png", ReferencePngEncoder.Instance);
+            }
+        }
     }
 }