Prepare cscore for merge into allwpilib.

cscore/src/main/native/cpp/CvSinkImpl.h

@@ -0,0 +1,52 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2016-2018 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef CSCORE_CVSINKIMPL_H_
+#define CSCORE_CVSINKIMPL_H_
+
+#include <atomic>
+#include <memory>
+#include <thread>
+#include <vector>
+
+#include <llvm/SmallVector.h>
+#include <llvm/StringRef.h>
+#include <llvm/raw_ostream.h>
+#include <support/raw_istream.h>
+#include <support/raw_socket_ostream.h>
+#include <tcpsockets/NetworkAcceptor.h>
+#include <tcpsockets/NetworkStream.h>
+
+#include "SinkImpl.h"
+
+namespace cs {
+
+class SourceImpl;
+
+class CvSinkImpl : public SinkImpl {
+ public:
+  explicit CvSinkImpl(llvm::StringRef name);
+  CvSinkImpl(llvm::StringRef name,
+             std::function<void(uint64_t time)> processFrame);
+  ~CvSinkImpl() override;
+
+  void Stop();
+
+  uint64_t GrabFrame(cv::Mat& image);
+  uint64_t GrabFrame(cv::Mat& image, double timeout);
+
+ private:
+  void ThreadMain();
+
+  std::atomic_bool m_active;  // set to false to terminate threads
+  std::thread m_thread;
+  std::function<void(uint64_t time)> m_processFrame;
+};
+
+}  // namespace cs
+
+#endif  // CSCORE_CVSINKIMPL_H_