Make sure to properly read image pixels (#1636)

Fixes #1503
2021-03-14 13:46:53 +02:00 · 2021-03-14 13:46:53 +02:00 · 7d20f6fda0
--- a/scripts/azure-templates-bootstrapper.yml
+++ b/scripts/azure-templates-bootstrapper.yml
@ -15,7 +15,7 @@ parameters:
  condition: succeeded()                        # whether or not to run this template
  shouldPublish: true                           # whether or not to publish the artifacts
  configuration: $(CONFIGURATION)               # the build configuration
-  buildExternals: ''                            # the build number to download externals from
+  buildExternals: '4555063'                            # the build number to download externals from
  verbosity: $(VERBOSITY)                       # the level of verbosity to use when building
  docker: ''                                    # the Docker image to build and use
  dockerArgs: ''                                # any additional arguments to pass to docker build
@ -26,17 +26,17 @@ parameters:
  installEmsdk: false                           # whether or not to install the Emscripten SDK

 jobs:
-# - ${{ if and(ne(parameters.buildExternals, ''), startsWith(parameters.name, 'native_')) }}:
-#   - template: azure-templates-download.yml
-#     parameters:
-#       name: ${{ parameters.name }}
-#       displayName: ${{ parameters.displayName }}
-#       vmImage: ${{ parameters.vmImage }}
-#       condition: ${{ parameters.condition }}
-#       postBuildSteps: ${{ parameters.postBuildSteps }}
-#       buildExternals: ${{ parameters.buildExternals }}
+- ${{ if and(ne(parameters.buildExternals, ''), startsWith(parameters.name, 'native_')) }}:
+  - template: azure-templates-download.yml
+    parameters:
+      name: ${{ parameters.name }}
+      displayName: ${{ parameters.displayName }}
+      vmImage: ${{ parameters.vmImage }}
+      condition: ${{ parameters.condition }}
+      postBuildSteps: ${{ parameters.postBuildSteps }}
+      buildExternals: ${{ parameters.buildExternals }}

-# - ${{ if or(eq(parameters.buildExternals, ''), not(startsWith(parameters.name, 'native_'))) }}:
+- ${{ if or(eq(parameters.buildExternals, ''), not(startsWith(parameters.name, 'native_'))) }}:
  - job: ${{ parameters.name }}
    displayName: ${{ parameters.displayName }}
    timeoutInMinutes: 120
--- a/source/SkiaSharp.Views/SkiaSharp.Views.Android/AndroidExtensions.cs
+++ b/source/SkiaSharp.Views/SkiaSharp.Views.Android/AndroidExtensions.cs
@ -139,9 +139,9 @@ namespace SkiaSharp.Views.Android
 			}
 		}

-		public static Bitmap ToBitmap(this SKPixmap skiaPixmap)
+		public static Bitmap ToBitmap(this SKImage skiaImage)
 		{
-			var info = skiaPixmap.Info;
+			var info = skiaImage.Info;

 			// destination values
 			var config = Bitmap.Config.Argb8888;
@ -172,7 +172,7 @@ namespace SkiaSharp.Views.Android
 			var ptr = bmp.LockPixels();

 			// copy
-			var success = skiaPixmap.ReadPixels(dstInfo, ptr, dstInfo.RowBytes);
+			var success = skiaImage.ReadPixels(dstInfo, ptr, dstInfo.RowBytes);

 			// confirm
 			bmp.UnlockPixels();
@ -183,15 +183,15 @@ namespace SkiaSharp.Views.Android
 				bmp = null;
 			}

+			GC.KeepAlive(skiaImage);
 			return bmp;
 		}

-		public static Bitmap ToBitmap(this SKImage skiaImage)
+		public static Bitmap ToBitmap(this SKPixmap skiaPixamp)
 		{
-			using (var pixmap = skiaImage.PeekPixels())
+			using (var image = SKImage.FromPixels(skiaPixamp))
 			{
-				var bmp = pixmap.ToBitmap();
-				GC.KeepAlive(skiaImage);
+				var bmp = image.ToBitmap();
 				return bmp;
 			}
 		}
--- a/tests/SkiaSharp.Android.Tests.sln
+++ b/tests/SkiaSharp.Android.Tests.sln
@ -15,6 +15,10 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp.Views.Android", "
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp.Views.Forms.Android", "..\source\SkiaSharp.Views.Forms\SkiaSharp.Views.Forms.Android\SkiaSharp.Views.Forms.Android.csproj", "{F962E49D-DC1F-4E93-9F6B-335E2746BCF1}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HarfBuzzSharp", "..\binding\HarfBuzzSharp\HarfBuzzSharp.csproj", "{814F4C3B-0767-4A6C-B274-71EAD305D2BF}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp", "..\binding\SkiaSharp\SkiaSharp.csproj", "{B9C1E6E5-D56B-4B10-946C-6493AE1C57FA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@ -47,6 +51,14 @@ Global
 		{F962E49D-DC1F-4E93-9F6B-335E2746BCF1}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F962E49D-DC1F-4E93-9F6B-335E2746BCF1}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F962E49D-DC1F-4E93-9F6B-335E2746BCF1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{814F4C3B-0767-4A6C-B274-71EAD305D2BF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{814F4C3B-0767-4A6C-B274-71EAD305D2BF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{814F4C3B-0767-4A6C-B274-71EAD305D2BF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{814F4C3B-0767-4A6C-B274-71EAD305D2BF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B9C1E6E5-D56B-4B10-946C-6493AE1C57FA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B9C1E6E5-D56B-4B10-946C-6493AE1C57FA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B9C1E6E5-D56B-4B10-946C-6493AE1C57FA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B9C1E6E5-D56B-4B10-946C-6493AE1C57FA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/tests/SkiaSharp.Android.Tests/AndroidExtensionsTests.cs
+++ b/tests/SkiaSharp.Android.Tests/AndroidExtensionsTests.cs
@ -0,0 +1,75 @@
+using Xunit;
+
+namespace SkiaSharp.Views.Android.Tests
+{
+	public class AndroidExtensionsTests : AndroidTests
+	{
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void PixelBackedImageToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var image = SKImage.FromBitmap(bitmap);
+
+			using var androidBitmap = image.ToBitmap();
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void BitmapToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+
+			using var androidBitmap = bitmap.ToBitmap();
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void PixmapToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var pixmap = bitmap.PeekPixels();
+
+			using var androidBitmap = pixmap.ToBitmap();
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void EncodedDataBackedImageToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var data = bitmap.Encode(SKEncodedImageFormat.Png, 100);
+			using var image = SKImage.FromEncodedData(data);
+
+			using var androidBitmap = image.ToBitmap();
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+	}
+}
--- a/tests/SkiaSharp.Android.Tests/AndroidTests.cs
+++ b/tests/SkiaSharp.Android.Tests/AndroidTests.cs
@ -0,0 +1,26 @@
+using Android.Graphics;
+using SkiaSharp.Tests;
+using Xunit;
+
+namespace SkiaSharp.Views.Android.Tests
+{
+	public abstract class AndroidTests : SKTest
+	{
+		protected static void ValidateTestBitmap(Bitmap bmp, byte alpha = 255)
+		{
+			Assert.NotNull(bmp);
+			Assert.Equal(40, bmp.Width);
+			Assert.Equal(40, bmp.Height);
+
+			Assert.Equal(Get(SKColors.Red), (uint)bmp.GetPixel(10, 10));
+			Assert.Equal(Get(SKColors.Green), (uint)bmp.GetPixel(30, 10));
+			Assert.Equal(Get(SKColors.Blue), (uint)bmp.GetPixel(10, 30));
+			Assert.Equal(Get(SKColors.Yellow), (uint)bmp.GetPixel(30, 30));
+
+			SKColor Get(SKColor color) =>
+				alpha == 0
+					? SKColor.Empty
+					: color.WithAlpha(alpha);
+		}
+	}
+}
--- a/tests/SkiaSharp.Android.Tests/FormsExtensionsTests.cs
+++ b/tests/SkiaSharp.Android.Tests/FormsExtensionsTests.cs
@ -0,0 +1,93 @@
+using System.Threading.Tasks;
+using Android.App;
+using SkiaSharp.Views.Android.Tests;
+using Xunit;
+
+namespace SkiaSharp.Views.Forms.Tests
+{
+	public class SKImageSourceHandlerTests : AndroidTests
+	{
+		private readonly SKImageSourceHandler handler;
+
+		public SKImageSourceHandlerTests()
+		{
+			handler = new SKImageSourceHandler();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task PixelBackedImageToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var image = SKImage.FromBitmap(bitmap);
+
+			var source = (SKImageImageSource)image;
+
+			using var androidBitmap = await handler.LoadImageAsync(source, Application.Context);
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task BitmapToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+
+			var source = (SKBitmapImageSource)bitmap;
+
+			using var androidBitmap = await handler.LoadImageAsync(source, Application.Context);
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task PixmapToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var pixmap = bitmap.PeekPixels();
+
+			var source = (SKPixmapImageSource)pixmap;
+
+			using var androidBitmap = await handler.LoadImageAsync(source, Application.Context);
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task EncodedDataBackedImageToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var data = bitmap.Encode(SKEncodedImageFormat.Png, 100);
+			using var image = SKImage.FromEncodedData(data);
+
+			var source = (SKImageImageSource)image;
+
+			using var androidBitmap = await handler.LoadImageAsync(source, Application.Context);
+
+			ValidateTestBitmap(androidBitmap, alpha);
+
+			androidBitmap.Recycle();
+		}
+	}
+}
--- a/tests/SkiaSharp.Android.Tests/SkiaSharp.Android.Tests.csproj
+++ b/tests/SkiaSharp.Android.Tests/SkiaSharp.Android.Tests.csproj
@ -94,6 +94,9 @@
    </ProjectReference>
  </ItemGroup>
  <ItemGroup>
+    <Compile Include="AndroidExtensionsTests.cs" />
+    <Compile Include="AndroidTests.cs" />
+    <Compile Include="FormsExtensionsTests.cs" />
    <Compile Include="MainActivity.cs" />
    <Compile Include="TestInstrumentation.cs" />
  </ItemGroup>
--- a/tests/SkiaSharp.iOS.Tests.sln
+++ b/tests/SkiaSharp.iOS.Tests.sln
@ -3,100 +3,128 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.808.5
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkiaSharp.iOS", "..\binding\SkiaSharp.iOS\SkiaSharp.iOS.csproj", "{A4146A87-DB60-4A17-A179-0E2E4255A08E}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp.iOS", "..\binding\SkiaSharp.iOS\SkiaSharp.iOS.csproj", "{A4146A87-DB60-4A17-A179-0E2E4255A08E}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HarfBuzzSharp.iOS", "..\binding\HarfBuzzSharp.iOS\HarfBuzzSharp.iOS.csproj", "{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HarfBuzzSharp.iOS", "..\binding\HarfBuzzSharp.iOS\HarfBuzzSharp.iOS.csproj", "{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkiaSharp.HarfBuzz", "..\source\SkiaSharp.HarfBuzz\SkiaSharp.HarfBuzz\SkiaSharp.HarfBuzz.csproj", "{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp.HarfBuzz", "..\source\SkiaSharp.HarfBuzz\SkiaSharp.HarfBuzz\SkiaSharp.HarfBuzz.csproj", "{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkiaSharp.Views.iOS", "..\source\SkiaSharp.Views\SkiaSharp.Views.iOS\SkiaSharp.Views.iOS.csproj", "{549F8E22-A756-4E99-A84A-C4E74832DA95}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp.Views.iOS", "..\source\SkiaSharp.Views\SkiaSharp.Views.iOS\SkiaSharp.Views.iOS.csproj", "{549F8E22-A756-4E99-A84A-C4E74832DA95}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkiaSharp.Views.Forms.iOS", "..\source\SkiaSharp.Views.Forms\SkiaSharp.Views.Forms.iOS\SkiaSharp.Views.Forms.iOS.csproj", "{0254162B-6B4A-459E-BD96-3A42A104C144}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp.Views.Forms.iOS", "..\source\SkiaSharp.Views.Forms\SkiaSharp.Views.Forms.iOS\SkiaSharp.Views.Forms.iOS.csproj", "{0254162B-6B4A-459E-BD96-3A42A104C144}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkiaSharp.iOS.Tests", "SkiaSharp.iOS.Tests\SkiaSharp.iOS.Tests.csproj", "{B73EB308-70BE-49FD-91A7-1D1495663D6D}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HarfBuzzSharp", "..\binding\HarfBuzzSharp\HarfBuzzSharp.csproj", "{5D79739D-98C6-48A4-965E-064DB4C59955}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharp", "..\binding\SkiaSharp\SkiaSharp.csproj", "{A694283C-FE40-4049-88AB-2CAE678FC087}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-		Debug|iPhoneSimulator = Debug|iPhoneSimulator
-		Release|iPhoneSimulator = Release|iPhoneSimulator
 		Debug|iPhone = Debug|iPhone
+		Debug|iPhoneSimulator = Debug|iPhoneSimulator
+		Release|Any CPU = Release|Any CPU
 		Release|iPhone = Release|iPhone
+		Release|iPhoneSimulator = Release|iPhoneSimulator
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|Any CPU.Build.0 = Release|Any CPU
-		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
-		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
-		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
-		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|iPhone.ActiveCfg = Debug|Any CPU
 		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|Any CPU.Build.0 = Release|Any CPU
 		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|iPhone.ActiveCfg = Release|Any CPU
 		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|iPhone.Build.0 = Release|Any CPU
+		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{A4146A87-DB60-4A17-A179-0E2E4255A08E}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|Any CPU.Build.0 = Release|Any CPU
-		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
-		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
-		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
-		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|iPhone.ActiveCfg = Debug|Any CPU
 		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|Any CPU.Build.0 = Release|Any CPU
 		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|iPhone.ActiveCfg = Release|Any CPU
 		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|iPhone.Build.0 = Release|Any CPU
+		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{D958E2E9-DE32-42E8-AB10-D25E4186C4E1}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Release|Any CPU.Build.0 = Release|Any CPU
-		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
-		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
-		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
-		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|iPhone.ActiveCfg = Debug|Any CPU
 		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{A5614B8C-31C8-43A3-9BF9-2719E4BE4D36}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
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 		{549F8E22-A756-4E99-A84A-C4E74832DA95}.Debug|iPhone.Build.0 = Debug|Any CPU
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 		{549F8E22-A756-4E99-A84A-C4E74832DA95}.Release|iPhone.Build.0 = Release|Any CPU
+		{549F8E22-A756-4E99-A84A-C4E74832DA95}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
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+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Release|iPhone.ActiveCfg = Release|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Release|iPhone.Build.0 = Release|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{A694283C-FE40-4049-88AB-2CAE678FC087}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/tests/SkiaSharp.iOS.Tests/FormsExtensionsTests.cs
+++ b/tests/SkiaSharp.iOS.Tests/FormsExtensionsTests.cs
@ -0,0 +1,84 @@
+using System.Threading.Tasks;
+using SkiaSharp.Views.iOS.Tests;
+using Xunit;
+
+namespace SkiaSharp.Views.Forms.Tests
+{
+	public class SKImageSourceHandlerTests : iOSTests
+	{
+		private readonly SKImageSourceHandler handler;
+
+		public SKImageSourceHandlerTests()
+		{
+			handler = new SKImageSourceHandler();
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task PixelBackedImageToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var image = SKImage.FromBitmap(bitmap);
+
+			var source = (SKImageImageSource)image;
+
+			using var uiImage = await handler.LoadImageAsync(source);
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task BitmapToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+
+			var source = (SKBitmapImageSource)bitmap;
+
+			using var uiImage = await handler.LoadImageAsync(source);
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task PixmapToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var pixmap = bitmap.PeekPixels();
+
+			var source = (SKPixmapImageSource)pixmap;
+
+			using var uiImage = await handler.LoadImageAsync(source);
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public async Task EncodedDataBackedImageToBitmap(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var data = bitmap.Encode(SKEncodedImageFormat.Png, 100);
+			using var image = SKImage.FromEncodedData(data);
+
+			var source = (SKImageImageSource)image;
+
+			using var uiImage = await handler.LoadImageAsync(source);
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+	}
+}
--- a/tests/SkiaSharp.iOS.Tests/SkiaSharp.iOS.Tests.csproj
+++ b/tests/SkiaSharp.iOS.Tests/SkiaSharp.iOS.Tests.csproj
@ -94,9 +94,13 @@
    <PackageReference Include="System.Buffers" Version="4.5.1" ExcludeAssets="all" />
  </ItemGroup>
  <ItemGroup>
+    <Compile Include="FormsExtensionsTests.cs" />
+    <Compile Include="iOSExtensionsTests.cs" />
+    <Compile Include="iOSTests.cs" />
    <Compile Include="Main.cs" />
    <Compile Include="AppDelegate.cs" />
    <Compile Include="TestApplicationDelegate.cs" />
+    <Compile Include="TestExtensions.cs" />
    <None Include="Entitlements.plist" />
    <None Include="Info.plist" />
  </ItemGroup>
--- a/tests/SkiaSharp.iOS.Tests/TestExtensions.cs
+++ b/tests/SkiaSharp.iOS.Tests/TestExtensions.cs
@ -0,0 +1,26 @@
+using CoreGraphics;
+
+namespace SkiaSharp.Views.iOS.Tests
+{
+	public static class TestExtensions
+	{
+		public static SKColor GetPixel(this CGImage cgImage, int x, int y)
+		{
+			var data = cgImage.DataProvider.CopyData();
+
+			var bytesPerPixel = cgImage.BitsPerPixel / cgImage.BitsPerComponent;
+
+			var offset = (y * cgImage.BytesPerRow) + (x * bytesPerPixel);
+
+			var a = data[offset + 3];
+			var r = data[offset + 0];
+			var g = data[offset + 1];
+			var b = data[offset + 2];
+
+			if (a == 0)
+				return SKColor.Empty;
+
+			return (SKColor)new SKColorF((float)r / a, (float)g / a, (float)b / a, a / 255f);
+		}
+	}
+}
--- a/tests/SkiaSharp.iOS.Tests/iOSExtensionsTests.cs
+++ b/tests/SkiaSharp.iOS.Tests/iOSExtensionsTests.cs
@ -0,0 +1,67 @@
+using Xunit;
+
+namespace SkiaSharp.Views.iOS.Tests
+{
+	public class iOSExtensionsTests : iOSTests
+	{
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void PixelBackedImageToUIImage(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var image = SKImage.FromBitmap(bitmap);
+
+			using var iosBitmap = image.ToUIImage();
+
+			ValidateTestBitmap(iosBitmap, alpha);
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void BitmapToUIImage(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+
+			using var uiImage = bitmap.ToUIImage();
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void PixmapToUIImage(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var pixmap = bitmap.PeekPixels();
+
+			using var uiImage = pixmap.ToUIImage();
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+
+		[SkippableTheory]
+		[InlineData(0)]
+		[InlineData(10)]
+		[InlineData(100)]
+		[InlineData(255)]
+		public void EncodedDataBackedImageToUIImage(byte alpha)
+		{
+			using var bitmap = CreateTestBitmap(alpha);
+			using var data = bitmap.Encode(SKEncodedImageFormat.Png, 100);
+			using var image = SKImage.FromEncodedData(data);
+
+			using var uiImage = image.ToUIImage();
+
+			ValidateTestBitmap(uiImage, alpha);
+		}
+	}
+}
--- a/tests/SkiaSharp.iOS.Tests/iOSTests.cs
+++ b/tests/SkiaSharp.iOS.Tests/iOSTests.cs
@ -0,0 +1,34 @@
+using CoreGraphics;
+using SkiaSharp.Tests;
+using UIKit;
+using Xunit;
+
+namespace SkiaSharp.Views.iOS.Tests
+{
+	public abstract class iOSTests : SKTest
+	{
+		protected static void ValidateTestBitmap(UIImage uiImage, byte alpha = 255)
+		{
+			var cgImage = uiImage.CGImage;
+
+			ValidateTestBitmap(cgImage, alpha);
+		}
+
+		protected static void ValidateTestBitmap(CGImage cgImage, byte alpha = 255)
+		{
+			Assert.NotNull(cgImage);
+			Assert.Equal(40, cgImage.Width);
+			Assert.Equal(40, cgImage.Height);
+
+			Assert.Equal(Get(SKColors.Red), cgImage.GetPixel(10, 10));
+			Assert.Equal(Get(SKColors.Green), cgImage.GetPixel(30, 10));
+			Assert.Equal(Get(SKColors.Blue), cgImage.GetPixel(10, 30));
+			Assert.Equal(Get(SKColors.Yellow), cgImage.GetPixel(30, 30));
+
+			SKColor Get(SKColor color) =>
+				alpha == 0
+					? SKColor.Empty
+					: color.WithAlpha(alpha);
+		}
+	}
+}