public static Blob ToHarfBuzzBlob(this SKStreamAsset asset)
{
if (asset == null)
{
throw new ArgumentNullException(nameof(asset));
}
var size = asset.Length;
Blob blob;
var memoryBase = asset.GetMemoryBase();
if (memoryBase != IntPtr.Zero)
{
blob = new Blob(memoryBase, size, MemoryMode.ReadOnly, () => asset.Dispose());
}
else
{
var ptr = Marshal.AllocCoTaskMem(size);
asset.Read(ptr, size);
blob = new Blob(ptr, size, MemoryMode.ReadOnly, () => Marshal.FreeCoTaskMem(ptr));
}
blob.MakeImmutable();
return(blob);
}
private static Blob GetHarfBuzzBlob(SKStreamAsset asset)
{
if (asset == null)
{
throw new ArgumentNullException(nameof(asset));
}
Blob blob;
var size = asset.Length;
var memoryBase = asset.GetMemoryBase();
if (memoryBase != IntPtr.Zero)
{
// the underlying stream is really a mamory block
// so save on copying and just use that directly
blob = new Blob(memoryBase, size, MemoryMode.ReadOnly, () => asset.Dispose());
}
else
{
// this could be a forward-only stream, so we must copy
var ptr = Marshal.AllocCoTaskMem(size);
asset.Read(ptr, size);
blob = new Blob(ptr, size, MemoryMode.ReadOnly, () => Marshal.FreeCoTaskMem(ptr));
}
// make immutable for performance?
blob.MakeImmutable();
return(blob);
}