public Metafile(Stream stream, IntPtr referenceHdc, RectangleF frameRect, MetafileFrameUnit frameUnit,
EmfType type, string description)
{
if (stream == null)
{
throw new NullReferenceException(nameof(stream));
}
// With libgdiplus we use a custom API for this, because there's no easy way
// to get the Stream down to libgdiplus. So, we wrap the stream with a set of delegates.
GdiPlusStreamHelper sh = new GdiPlusStreamHelper(stream, false);
int status = Gdip.GdipRecordMetafileFromDelegate_linux(sh.GetHeaderDelegate, sh.GetBytesDelegate,
sh.PutBytesDelegate, sh.SeekDelegate, sh.CloseDelegate, sh.SizeDelegate, referenceHdc,
type, ref frameRect, frameUnit, description, out nativeImage);
// Since we're just passing to native code the delegates inside the wrapper, we need to keep sh alive
// to avoid the object being collected and therefore the delegates would be collected as well.
GC.KeepAlive(sh);
Gdip.CheckStatus(status);
}
public Metafile(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
Status status;
if (GDIPlus.RunningOnUnix())
{
// With libgdiplus we use a custom API for this, because there's no easy way
// to get the Stream down to libgdiplus. So, we wrap the stream with a set of delegates.
GdiPlusStreamHelper sh = new GdiPlusStreamHelper(stream, false);
status = SafeNativeMethods.Gdip.GdipCreateMetafileFromDelegate_linux(sh.GetHeaderDelegate, sh.GetBytesDelegate,
sh.PutBytesDelegate, sh.SeekDelegate, sh.CloseDelegate, sh.SizeDelegate, out nativeObject);
}
else
{
status = SafeNativeMethods.Gdip.GdipCreateMetafileFromStream(new ComIStreamWrapper(stream), out nativeObject);
}
SafeNativeMethods.Gdip.CheckStatus(status);
}
