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Add an extension point to override native libraries loading #1922

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Add an extension point to override native libraries loading #1922

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36 changes: 34 additions & 2 deletions binding/Binding.Shared/LibraryLoader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,31 @@ namespace SkiaSharp
#endif
{
#if USE_DELEGATES || USE_LIBRARY_LOADER
public static class LibraryLoaderSettings
{
private static bool _isFrozen;
private static Func<string, IntPtr> _loadLibraryOverride;

/// <summary>
/// Gets or sets the function to override the default native library loading behavior.
/// The func gets the name of the native library to be loaded as a parameter, returns the OS handle for the loaded native library.
/// Can be set only on initialization stage before the first library is loaded, otherwise an exception will be thrown.
/// </summary>
public static Func<string, IntPtr> LoadLibraryOverride
{
get => _loadLibraryOverride;
set
{
if (_isFrozen)
throw new Exception ("After any native library is loaded, the load method cannot be changed.");

_loadLibraryOverride = value;
}
}

internal static void Freeze () => _isFrozen = true;
}

internal static class LibraryLoader
{
static LibraryLoader ()
Expand All @@ -33,9 +58,16 @@ static LibraryLoader ()

public static IntPtr LoadLocalLibrary<T> (string libraryName)
{
var libraryPath = GetLibraryPath (libraryName);
LibraryLoaderSettings.Freeze ();

IntPtr handle;
if (LibraryLoaderSettings.LoadLibraryOverride != null)
handle = LibraryLoaderSettings.LoadLibraryOverride (libraryName);
else {
var libraryPath = GetLibraryPath (libraryName);
handle = LoadLibrary (libraryPath);
}

var handle = LoadLibrary (libraryPath);
if (handle == IntPtr.Zero)
throw new DllNotFoundException ($"Unable to load library '{libraryName}'.");

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