1 files changed, 64 insertions, 0 deletions
diff --git a/tests/Jellyfin.Controller.Tests/Drawing/ImageHelperTests.cs b/tests/Jellyfin.Controller.Tests/Drawing/ImageHelperTests.cs
new file mode 100644
index 0000000000..571cb7f0d4
--- /dev/null
+++ b/tests/Jellyfin.Controller.Tests/Drawing/ImageHelperTests.cs
@@ -0,0 +1,64 @@
+using MediaBrowser.Controller.Drawing;
+using MediaBrowser.Model.Drawing;
+using Xunit;
+
+namespace Jellyfin.Controller.Tests.Drawing;
+
+public static class ImageHelperTests
+{
+    [Fact]
+    public static void GetNewImageSize_ExplicitSizeLargerThanSource_ClampsToSource()
+    {
+        // Regression test for https://github.com/jellyfin/jellyfin/issues/17056: the caller-supplied
+        // width/height were used verbatim, so a single request could ask for a 23100x23100 encode.
+        var options = new ImageProcessingOptions { Width = 23100, Height = 23100 };
+
+        var newSize = ImageHelper.GetNewImageSize(options, new ImageDimensions(600, 336));
+
+        Assert.Equal(336, newSize.Width);
+        Assert.Equal(336, newSize.Height);
+    }
+
+    [Fact]
+    public static void GetNewImageSize_WidthLargerThanSource_ClampsToSource()
+    {
+        var options = new ImageProcessingOptions { Width = 10000 };
+
+        var newSize = ImageHelper.GetNewImageSize(options, new ImageDimensions(600, 336));
+
+        Assert.Equal(600, newSize.Width);
+        Assert.Equal(336, newSize.Height);
+    }
+
+    [Fact]
+    public static void GetNewImageSize_FillLargerThanSource_ClampsToSource()
+    {
+        // ResizeFill already refused to upscale; this pins that behaviour.
+        var options = new ImageProcessingOptions { FillWidth = 23100, FillHeight = 23100 };
+
+        var newSize = ImageHelper.GetNewImageSize(options, new ImageDimensions(600, 336));
+
+        Assert.Equal(600, newSize.Width);
+        Assert.Equal(336, newSize.Height);
+    }
+
+    [Fact]
+    public static void GetNewImageSize_SmallerThanSource_StillDownscales()
+    {
+        var options = new ImageProcessingOptions { MaxWidth = 300 };
+
+        var newSize = ImageHelper.GetNewImageSize(options, new ImageDimensions(600, 336));
+
+        Assert.Equal(300, newSize.Width);
+        Assert.Equal(168, newSize.Height);
+    }
+
+    [Fact]
+    public static void GetNewImageSize_NoSizeRequested_ReturnsSource()
+    {
+        var newSize = ImageHelper.GetNewImageSize(new ImageProcessingOptions(), new ImageDimensions(600, 336));
+
+        Assert.Equal(600, newSize.Width);
+        Assert.Equal(336, newSize.Height);
+    }
+}