private SafeCoTaskMemHandle CreateHeifWriter()
{
if (!this.stream.CanWrite)
{
throw new IOException(Resources.StreamCannotWrite);
}
this.writerErrors = new WriterErrors();
var writerHandle = SafeCoTaskMemHandle.Allocate(MarshalHelper.SizeOf <heif_writer>());
unsafe
{
var writer = (heif_writer *)writerHandle.DangerousGetHandle();
writer->heif_writer_version = 1;
writer->write = Marshal.GetFunctionPointerForDelegate(this.writeDelegate);
}
return(writerHandle);
}
protected HeifWriter()
{
this.heifWriterHandle = new DisposableLazy <SafeCoTaskMemHandle>(CreateHeifWriter);
this.writerErrors = new WriterErrors();
this.writeDelegate = Write;
}
