ResizeTests.LargeImage

src/ImageSharp/Processing/Processors/Transforms/Resize/ResizeWorker.cs

@@ -114,7 +114,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
                 // Ensure offsets are normalized for cropping and padding.
                 ResizeKernel kernel = this.verticalKernelMap.GetKernel(y - this.targetOrigin.Y);
 
-                while (kernel.StartIndex + kernel.Length > this.currentWindow.Max)
+                if (kernel.StartIndex + kernel.Length > this.currentWindow.Max)
                 {
                     this.Slide();
                 }
@@ -145,8 +145,9 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
 
         private void Slide()
         {
-            int minY = this.currentWindow.Min + this.windowBandHeight;
-            int maxY = Math.Min(this.currentWindow.Max + this.windowBandHeight, this.sourceRectangle.Height);
+            int minY = this.currentWindow.Max - this.windowBandHeight;
+            int maxY = Math.Min(minY + this.workerHeight, this.sourceRectangle.Height);
+
             this.currentWindow = new RowInterval(minY, maxY);
             this.CalculateFirstPassValues(this.currentWindow);
         }

tests/ImageSharp.Tests/Processing/Processors/Transforms/ResizeTests.cs

@@ -34,12 +34,27 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
 
         public static readonly string[] SmokeTestResamplerNames =
             {
-                nameof(KnownResamplers.NearestNeighbor), nameof(KnownResamplers.Bicubic), nameof(KnownResamplers.Box),
+                nameof(KnownResamplers.NearestNeighbor), 
+                nameof(KnownResamplers.Bicubic), 
+                nameof(KnownResamplers.Box),
                 nameof(KnownResamplers.Lanczos5),
             };
 
         private static readonly ImageComparer ValidatorComparer = ImageComparer.TolerantPercentage(0.07F);
 
+        [Theory]
+        [WithTestPatternImages(4000, 4000, PixelTypes.Rgba32)]
+        public void LargeImage<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : struct, IPixel<TPixel>
+        {
+            if (!TestEnvironment.Is64BitProcess)
+            {
+                return;
+            }
+
+            provider.RunValidatingProcessorTest(x => x.Resize(300, 300), appendPixelTypeToFileName: false);
+        }
+        
         [Theory]
         [WithBasicTestPatternImages(15, 12, PixelTypes.Rgba32, 2, 3, 1, 2)]
         [WithBasicTestPatternImages(2, 256, PixelTypes.Rgba32, 1, 1, 1, 8)]

tests/Images/External

@@ -1 +1 @@
-Subproject commit 6db7ed95dd8a2de4caa6d885952b6689d026ad27
+Subproject commit 8693e2fd4577a9ac1a749da8db564095b5a05389