From Malloc Memory(IntPtr, UInt64) Method
This API is now obsolete.
[System.Obsolete("Not supported.", true)] public static SkiaSharp.SKData FromMallocMemory (IntPtr bytes, ulong length);
Pointer to memory that has been allocated with the operating system's "malloc" or AllocHGlobal(Int32) method.
The size of the buffer allocated.
When this SKData instance is cleared, the free method will be called on the provided buffer.