[iOS, Mac] Fix for downsized image retaining original dimensions in GraphicsView (#30007)

* [iOS] Fix for downsized image retains original size

* Renamed variables for better readability

Author: SyedAbdulAzeemSF4852

src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj

@@ -68,6 +68,7 @@
     <EmbeddedResource Include="Resources\Fonts\Dokdo-Regular.ttf" />
     <EmbeddedResource Include="Resources\Images\royals.png" />
     <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
+    <EmbeddedResource Include="Resources\Images\royals.png" />
   </ItemGroup>
 
   <ItemGroup>

src/Controls/tests/TestCases.HostApp/Issues/Issue30006.cs

@@ -0,0 +1,77 @@
+using System.Reflection;
+using Microsoft.Maui.Graphics.Platform;
+using IImage = Microsoft.Maui.Graphics.IImage;
+
+namespace Controls.TestCases.HostApp.Issues;
+
+[Issue(IssueTracker.Github, 30006, "The downsized image continues to retain its original dimensions", PlatformAffected.iOS)]
+public class Issue30006 : ContentPage
+{
+	Label _convertedImageStatusLabel;
+	public Issue30006()
+	{
+		_convertedImageStatusLabel = new Label
+		{
+			AutomationId = "ConvertedImage",
+			Text = "Result Image Status: "
+		};
+
+		VerticalStackLayout verticalStackLayout = new VerticalStackLayout
+		{
+			Padding = new Thickness(20),
+			Spacing = 10,
+			Children =
+			{
+				CreateButton("DownSize", OnDownSize),
+				_convertedImageStatusLabel,
+			}
+		};
+
+		Content = new ScrollView { Content = verticalStackLayout };
+	}
+
+	Button CreateButton(string text, EventHandler handler)
+	{
+		Button button = new Button
+		{
+			AutomationId = $"Issue30006DownSizeBtn",
+			Text = text,
+			HorizontalOptions = LayoutOptions.Fill
+		};
+
+		button.Clicked += handler;
+		return button;
+	}
+
+	async Task<IImage> LoadImageAsync()
+	{
+		var assembly = GetType().GetTypeInfo().Assembly;
+		using var stream = assembly.GetManifestResourceStream("Controls.TestCases.HostApp.Resources.Images.royals.png");
+		return await Task.FromResult(PlatformImage.FromStream(stream));
+	}
+
+	async void OnDownSize(object sender, EventArgs e)
+	{
+		var image = await LoadImageAsync();
+		var res = image.Downsize(10);
+
+		UpdateStatusLabels(res);
+	}
+
+	void UpdateStatusLabels(IImage resultImage)
+	{
+		_convertedImageStatusLabel.Text = TryAccessImage(resultImage)
+		? "Success"
+		: "Failure";
+	}
+
+	bool TryAccessImage(IImage downsizedImage)
+	{
+		if (Math.Round(downsizedImage.Width) == 10 && Math.Round(downsizedImage.Height) == 8)
+		{
+			return true;
+		}
+
+		return false;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30006.cs

@@ -0,0 +1,27 @@
+#if TEST_FAILS_ON_WINDOWS // Issue Link - https://github.com/dotnet/maui/issues/16767
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue30006 : _IssuesUITest
+{
+	public Issue30006(TestDevice device) : base(device)
+	{
+	}
+
+	public override string Issue => "The downsized image continues to retain its original dimensions";
+
+	[Test]
+	[Category(UITestCategories.GraphicsView)]
+	public void VerifyDownsizedImageHasNewDimensions()
+	{
+		App.WaitForElement("ConvertedImage");
+		App.Tap("Issue30006DownSizeBtn");
+
+		var downsizedLabelText = App.FindElement("ConvertedImage").GetText();
+		Assert.That(downsizedLabelText, Is.EqualTo("Success"));
+	}
+}
+#endif

src/Graphics/src/Graphics/Platforms/iOS/UIImageExtensions.cs

@@ -27,7 +27,7 @@ public static UIImage ScaleImage(this UIImage target, float maxWidth, float maxH
 
 		public static UIImage ScaleImage(this UIImage target, CGSize size, bool disposeOriginal = false)
 		{
-			using (var renderer = new UIGraphicsImageRenderer(target.Size))
+			using (var renderer = new UIGraphicsImageRenderer(size))
 			{
 				var resultImage = renderer.CreateImage((UIGraphicsImageRendererContext imageContext) =>
 				{