[BUG] Unable to load shared Library LibskiaSharp on RHEL9 based docker image.

[Schoof-T]

Description

I am using LiveCharts2 RC 6.1, which uses SkiaSharp to generate a Gauge Chart.
I am trying to convert this to a bitmap and base64 (for usage in PDF generation).

This works perfectly in my local (Windows) machine, but after I deploy to our local docker containers (based on RHEL9), this doesn't work, and I get the error below: Unable to load shared library 'libSkiaSharp'.

The exception occurs on this line of code:
using var bitmap = new SkiaSharp.SKBitmap(totalStockGaugeChart.Width, totalStockGaugeChart.Height);

I have tried adding the Nuget Packages:

• SkiaSharp.NativeAssets.Linux
• SkiaSharp.NativeAssets.Linux.NoDependencies

But those did not make a difference.

Ultimately, after a day of trial and error I managed to get it to work by adjusting my docker file, and adding the following:
I do not need the SkiaSharp.NativeAssets.Linux either than.

#SKIASHARP
RUN microdnf install -y \
    fontconfig \
    freetype \
    freetype-devel \
    libpng \
    expat \
    && microdnf clean all

# SKIASHARP
# fontconfig and its dependencies
COPY --from=build /usr/lib64/libfontconfig.so.1 /usr/lib64/libfontconfig.so.1
COPY --from=build /usr/lib64/libfontconfig.so.1.12.0 /usr/lib64/libfontconfig.so.1.12.0
COPY --from=build /usr/lib64/libfreetype.so.6 /usr/lib64/libfreetype.so.6
COPY --from=build /usr/lib64/libfreetype.so.6.17.4 /usr/lib64/libfreetype.so.6.17.4
COPY --from=build /usr/lib64/libpng16.so.16 /usr/lib64/libpng16.so.16
COPY --from=build /usr/lib64/libpng16.so.16.37.0 /usr/lib64/libpng16.so.16.37.0
COPY --from=build /usr/lib64/libharfbuzz.so.0 /usr/lib64/libharfbuzz.so.0
COPY --from=build /usr/lib64/libharfbuzz.so.0.20704.0 /usr/lib64/libharfbuzz.so.0.20704.0
COPY --from=build /usr/share/fontconfig /usr/share/fontconfig
COPY --from=build /etc/fonts /etc/fonts
COPY --from=build /usr/lib64/libgraphite2.so.3 /usr/lib64/libgraphite2.so.3
COPY --from=build /usr/lib64/libgraphite2.so.3.2.1 /usr/lib64/libgraphite2.so.3.2.1

Code

        using var bitmap = new SkiaSharp.SKBitmap(totalStockGaugeChart.Width, totalStockGaugeChart.Height);
        using var canvas = new SkiaSharp.SKCanvas(bitmap);
        totalStockGaugeChart.DrawOnCanvas(canvas);

        using var image = SkiaSharp.SKImage.FromBitmap(bitmap);
        using var data = image.Encode(SkiaSharp.SKEncodedImageFormat.Png, 100);

        return System.Convert.ToBase64String(data.ToArray());

Expected Behavior

I expected the code to generate my Base64String, and not crash.

Actual Behavior

I get an exception:

System.TypeInitializationException: The type initializer for 'SkiaSharp.SKImageInfo' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'libSkiaSharp' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
libfontconfig.so.1: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/libSkiaSharp.so: cannot open shared object file: No such file or directory
/app/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
/app/libSkiaSharp: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/libSkiaSharp: cannot open shared object file: No such file or directory
/app/liblibSkiaSharp: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/liblibSkiaSharp: cannot open shared object file: No such file or directory
   at SkiaSharp.SkiaApi.sk_colortype_get_default_8888()
   at SkiaSharp.SkiaApi.sk_colortype_get_default_8888()
   at SkiaSharp.SKImageInfo..cctor()
   --- End of inner exception stack trace ---
   at SkiaSharp.SKImageInfo..ctor(Int32 width, Int32 height)

Version of SkiaSharp

3.116.0 (Current)

Last Known Good Version of SkiaSharp

Other (Please indicate in the description)

IDE / Editor

Visual Studio (Windows)

Platform / Operating System

Linux

Platform / Operating System Version

• registry.access.redhat.com/ubi9/dotnet-100:9.7-1771893416 AS base
• rhel 9

Devices

No response

Relevant Screenshots

No response

Relevant Log Output

System.TypeInitializationException: The type initializer for 'SkiaSharp.SKImageInfo' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'libSkiaSharp' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
libfontconfig.so.1: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/libSkiaSharp.so: cannot open shared object file: No such file or directory
/app/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
/app/libSkiaSharp: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/libSkiaSharp: cannot open shared object file: No such file or directory
/app/liblibSkiaSharp: cannot open shared object file: No such file or directory
/usr/lib64/dotnet/shared/Microsoft.NETCore.App/10.0.3/liblibSkiaSharp: cannot open shared object file: No such file or directory
   at SkiaSharp.SkiaApi.sk_colortype_get_default_8888()
   at SkiaSharp.SkiaApi.sk_colortype_get_default_8888()
   at SkiaSharp.SKImageInfo..cctor()
   --- End of inner exception stack trace ---
   at SkiaSharp.SKImageInfo..ctor(Int32 width, Int32 height)

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