private void CreateOffscreenViewer()
{
DestroyOffscreenViewer();
if (m_GngOffscreenViewer == null)
{
// create two decompression buffer object instances
m_GngDecompBuffer1 = new GngDecompBuffer();
m_GngDecompBuffer1.SetBufferSize(width, heigth, GngDecompBufferFormat.dbfRGB32);
m_GngDecompBuffer2 = new GngDecompBuffer();
m_GngDecompBuffer2.SetBufferSize(width, heigth, GngDecompBufferFormat.dbfRGB32);
// create the offscreen viewer object instance
m_GngOffscreenViewer = new GngOffscreenViewer(m_GngDecompBuffer1);
m_NewPicDecompBuffer = m_GngDecompBuffer1;
m_GngOffscreenViewer.GetTextParams(out GngViewTextParams Params);
// display a timestamp in the viewer
Params.InsertPicInfo = true;
Params.FontSize = 20;
m_GngOffscreenViewer.SetTextParams(Params);
m_GngOffscreenViewer.SetOffscreenViewerSize(width, heigth, true);
m_GngOffscreenViewer.Refresh();
// set callbacks of the offscreen viewer objects
OffscreenViewerAcceptCallbackDelegate OffscreenViewerAcceptCallbackDelegateInstance = new OffscreenViewerAcceptCallbackDelegate(GngOffscreenViewer_AcceptCallbackDelegate);
m_GngOffscreenViewer.SetOffscreenViewerAcceptCallBack(OffscreenViewerAcceptCallbackDelegateInstance);
OffscreenViewerCallbackDelegate OffscreenViewerCallbackDelegateInstance = new OffscreenViewerCallbackDelegate(GngOffscreenViewer_CallbackDelegate);
m_GngOffscreenViewer.SetOffscreenViewerCallBack(OffscreenViewerCallbackDelegateInstance);
}
}
private void GngOffscreenViewer_CallbackDelegate(OffscreenViewerCallbackEventArgs e)
{
// check whether image in buffer is valid
if (e.PicData.GngMediaDesc != null)
{
// new decompressed picture available
lock (m_CSBuffer)
{
m_NewPicDecompressed = true;
if (e.OffscreenBufferHandle.IsNativeBufferIdentical(m_GngDecompBuffer2))
{
Monitor.Exit(m_CSBuffer2);
m_NewPicDecompBuffer = m_GngDecompBuffer2;
}
else
{
Monitor.Exit(m_CSBuffer1);
m_NewPicDecompBuffer = m_GngDecompBuffer1;
}
}
CreateFrame();
e.ImageWasHandled = true;
}
}
private void DestroyOffscreenViewer()
{
if (m_GngOffscreenViewer != null)
{
m_GngOffscreenViewer.Disconnect(true);
m_GngOffscreenViewer.CloseCustomDrawCallBack();
m_GngOffscreenViewer.CloseOffscreenViewerAcceptCallBack();
m_GngOffscreenViewer.CloseOffscreenViewerCallBack();
m_GngOffscreenViewer.Dispose();
m_GngOffscreenViewer = null;
}
m_NewPicDecompBuffer = null;
if (m_GngDecompBuffer1 != null)
{
m_GngDecompBuffer1.Dispose();
m_GngDecompBuffer1 = null;
}
if (m_GngDecompBuffer2 != null)
{
m_GngDecompBuffer2.Dispose();
m_GngDecompBuffer2 = null;
}
}
