Update SkiaSharp 2→3 (and bump ScottPlot version 5.0→5.1) (ScottPlot#5061)

* ScottPlot: update package versions

* Controls: update package versions

* Update SkiaSharp/OpenTK dependencies

* SKPaintAndFont: partial implementation

* SKPaintAndFont: partial implementation

* SKPaintAndFont: partial implementation

* SKPaintAndFont: partial implementation

* SKPaintAndFont: partial implementation

* WinUI: Update SkiaSharp view package

* Drawing: respect ResizeFilter

* MeasureText: improve measurement of '1' character

* MeasureText: pixel perfict consistent with previous version

* RadialGauge: fix label vertical alignment

* SKPaintAndFont→Paint

* Paint: prefix SkiaSharp primitive properties with SK

* Demo: use Paint not SKPaint

* Colorbar: use Paint not SKPaint

* Coxcomb: use Paint not SKPaint

* IColormap: Improve GetImageVertical() fractional logic

* Coxcomb: refine drawing methods

* Refactor to use Drawing methods instead of accessing Paint.SKPaint

* Paint: aggressively pass through render system to avoid allocations

Author: swharden

CHANGELOG.md

@@ -1,5 +1,9 @@
-## ScottPlot 5.0.57
+## ScottPlot 5.1.57
 _Not yet on NuGet..._
+* The transition from ScottPlot `5.0` to `5.1` has breaking changes which are likely to affect advanced users who maintain custom plot types. Upgrading our SkiaSharp from `2.88` to `3.119` brought many improvements, but significantly changed the functionality of `SkiaSharp.SKPaint` which many of our drawing operations relied on. To minimize the impact of this change, references to `SkiaSharp.SKPaint` have been replaced with `ScottPlot.Paint` which closely resembles the original API, minimizing amount of code changes required to upgrade. This version aims at making this upgrade possible, and future versions will refine these objects to improve performance and minimize allocations.
+* Public methods that accepted `SkiaSharp.SKPaint` now accept `ScottPlot.Paint`
+* `Paint.MeasureText()` now returns a single `PixelRect` instead of using `out` variables
+* Rendering: Significantly reduced the number of allocations by passing `Paint` throughout the render flow
 
 ## ScottPlot 5.0.56
 _Published on [NuGet](https://www.nuget.org/profiles/ScottPlot) on 2025-08-22_

src/ScottPlot5/ScottPlot5 Controls/ScottPlot.Avalonia/ScottPlot.Avalonia.csproj

@@ -1,7 +1,7 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net462;net6.0;net8.0</TargetFrameworks>
+        <TargetFrameworks>net462;net8.0</TargetFrameworks>
         <Nullable>enable</Nullable>
         <ImplicitUsings>disable</ImplicitUsings>
         <LangVersion>11</LangVersion>
@@ -39,8 +39,7 @@
 
     <!-- Include additional files for the NuGet package -->
     <ItemGroup>
-        <None Include="../../../../dev/icon/v5/scottplot-icon-rounded-border-128.png" Pack="true"
-            PackagePath="icon.png" />
+        <None Include="../../../../dev/icon/v5/scottplot-icon-rounded-border-128.png" Pack="true" PackagePath="icon.png" />
         <None Include="nuget-readme.md" Pack="true" PackagePath="readme.md" />
     </ItemGroup>
 
@@ -50,8 +49,8 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="Avalonia" Version="11.0.2" />
-        <PackageReference Include="Avalonia.Skia" Version="11.0.2" />
+        <PackageReference Include="Avalonia" Version="11.3.4" />
+        <PackageReference Include="Avalonia.Skia" Version="11.3.4" />
         <ProjectReference Include="..\..\ScottPlot5\ScottPlot.csproj" />
     </ItemGroup>
 </Project>

src/ScottPlot5/ScottPlot5 Controls/ScottPlot.Blazor/ScottPlot.Blazor.csproj

@@ -50,7 +50,7 @@
     <!-- Package dependencies -->
     <ItemGroup>
         <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="8.0.0" />
-        <PackageReference Include="SkiaSharp.Views.Blazor" Version="2.88.9" />
+        <PackageReference Include="SkiaSharp.Views.Blazor" Version="3.119.0" />
         <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

src/ScottPlot5/ScottPlot5 Controls/ScottPlot.Eto/ScottPlot.Eto.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net462;net6.0;net8.0</TargetFrameworks>
+        <TargetFrameworks>net8.0</TargetFrameworks>
         <Nullable>enable</Nullable>
         <ImplicitUsings>disable</ImplicitUsings>
         <LangVersion>11</LangVersion>

src/ScottPlot5/ScottPlot5 Controls/ScottPlot.Maui/ScottPlot.Maui.csproj

@@ -60,8 +60,8 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
         <PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
-        <PackageReference Include="SkiaSharp.Views.Maui.Controls" Version="2.88.9" />
-        <PackageReference Include="SkiaSharp.Views.Maui.Core" Version="2.88.9" />
+        <PackageReference Include="SkiaSharp.Views.Maui.Controls" Version="3.119.0" />
+        <PackageReference Include="SkiaSharp.Views.Maui.Core" Version="3.119.0" />
         <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

src/ScottPlot5/ScottPlot5 Controls/ScottPlot.OpenGL/ScottPlot.OpenGL.csproj

@@ -1,7 +1,7 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net6.0-windows;net462</TargetFrameworks>
+        <TargetFrameworks>net462;net8.0-windows</TargetFrameworks>
         <Nullable>enable</Nullable>
         <ImplicitUsings>disable</ImplicitUsings>
         <LangVersion>11</LangVersion>
@@ -52,11 +52,11 @@
         <ProjectReference Include="..\..\ScottPlot5\ScottPlot.csproj" />
     </ItemGroup>
 
-	<ItemGroup Condition="'$(TargetFramework)' == 'net462'">
-		<PackageReference Include="OpenTK" Version="3.3.1" NoWarn="NU1701" />
-	</ItemGroup>
-	<ItemGroup Condition="'$(TargetFramework)' != 'net462'">
-		<PackageReference Include="OpenTK" Version="4.3.0" NoWarn="NU1701" />
-	</ItemGroup>
+    <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
+        <PackageReference Include="OpenTK" Version="3.3.1" NoWarn="NU1701" />
+    </ItemGroup>
+    <ItemGroup Condition="'$(TargetFramework)' != 'net462'">
+        <PackageReference Include="OpenTK" Version="4.3.0" NoWarn="NU1701" />
+    </ItemGroup>
 
 </Project>