Prepare cscore for merge into allwpilib.

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

@@ -0,0 +1,70 @@
+/*----------------------------------------------------------------------------*/
+/* 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_USBCAMERAPROPERTY_H_
+#define CSCORE_USBCAMERAPROPERTY_H_
+
+#ifdef __linux__
+#include <linux/videodev2.h>
+#endif
+
+#include <memory>
+
+#include <support/mutex.h>
+
+#include "PropertyImpl.h"
+
+namespace cs {
+
+// Property data
+class UsbCameraProperty : public PropertyImpl {
+ public:
+  UsbCameraProperty() = default;
+  explicit UsbCameraProperty(llvm::StringRef name_) : PropertyImpl{name_} {}
+
+  // Normalized property constructor
+  UsbCameraProperty(llvm::StringRef name_, int rawIndex_,
+                    const UsbCameraProperty& rawProp, int defaultValue_,
+                    int value_)
+      : PropertyImpl(name_, rawProp.propKind, 1, defaultValue_, value_),
+        percentage{true},
+        propPair{rawIndex_},
+        id{rawProp.id},
+        type{rawProp.type} {
+    hasMinimum = true;
+    minimum = 0;
+    hasMaximum = true;
+    maximum = 100;
+  }
+
+#ifdef __linux__
+#ifdef VIDIOC_QUERY_EXT_CTRL
+  explicit UsbCameraProperty(const struct v4l2_query_ext_ctrl& ctrl);
+#endif
+  explicit UsbCameraProperty(const struct v4l2_queryctrl& ctrl);
+
+  static std::unique_ptr<UsbCameraProperty> DeviceQuery(int fd, __u32* id);
+
+  bool DeviceGet(std::unique_lock<wpi::mutex>& lock, int fd);
+  bool DeviceSet(std::unique_lock<wpi::mutex>& lock, int fd) const;
+  bool DeviceSet(std::unique_lock<wpi::mutex>& lock, int fd, int newValue,
+                 llvm::StringRef newValueStr) const;
+#endif
+
+  // If this is a percentage (rather than raw) property
+  bool percentage{false};
+
+  // If not 0, index of corresponding raw/percentage property
+  int propPair{0};
+
+  unsigned id{0};  // implementation-level id
+  int type{0};  // implementation type, not CS_PropertyKind!
+};
+
+}  // namespace cs
+
+#endif  // CSCORE_USBCAMERAPROPERTY_H_