1 files changed, 92 insertions, 0 deletions
diff --git a/chromium/ui/gfx/x/event.h b/chromium/ui/gfx/x/event.h
new file mode 100644
index 00000000000..37073dbd584
--- /dev/null
+++ b/chromium/ui/gfx/x/event.h
@@ -0,0 +1,92 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_GFX_X_EVENT_H_
+#define UI_GFX_X_EVENT_H_
+
+#include <X11/Xlib.h>
+#include <xcb/xcb.h>
+
+#include <cstdint>
+#include <utility>
+
+#include "base/component_export.h"
+
+namespace x11 {
+
+class Connection;
+class Event;
+
+COMPONENT_EXPORT(X11)
+void ReadEvent(Event* event, Connection* connection, const uint8_t* buffer);
+
+class COMPONENT_EXPORT(X11) Event {
+ public:
+  // Used to create events for testing.
+  template <typename T>
+  Event(XEvent* xlib_event, T&& xproto_event) {
+    sequence_valid_ = true;
+    sequence_ = xlib_event_.xany.serial;
+    custom_allocated_xlib_event_ = true;
+    xlib_event_ = *xlib_event;
+    type_id_ = T::type_id;
+    deleter_ = [](void* event) { delete reinterpret_cast<T*>(event); };
+    event_ = new T(std::forward<T>(xproto_event));
+  }
+
+  Event();
+  Event(xcb_generic_event_t* xcb_event,
+        Connection* connection,
+        bool sequence_valid = true);
+
+  Event(const Event&) = delete;
+  Event& operator=(const Event&) = delete;
+
+  Event(Event&& event);
+  Event& operator=(Event&& event);
+
+  ~Event();
+
+  template <typename T>
+  T* As() {
+    if (type_id_ == T::type_id)
+      return reinterpret_cast<T*>(event_);
+    return nullptr;
+  }
+
+  template <typename T>
+  const T* As() const {
+    return const_cast<Event*>(this)->As<T>();
+  }
+
+  bool sequence_valid() const { return sequence_valid_; }
+  uint32_t sequence() const { return sequence_; }
+
+  const XEvent& xlib_event() const { return xlib_event_; }
+  XEvent& xlib_event() { return xlib_event_; }
+
+ private:
+  friend void ReadEvent(Event* event,
+                        Connection* connection,
+                        const uint8_t* buffer);
+
+  void Dealloc();
+
+  bool sequence_valid_ = false;
+  uint32_t sequence_ = 0;
+
+  // Indicates if |xlib_event_| was allocated manually and therefore
+  // needs to be freed manually.
+  bool custom_allocated_xlib_event_ = false;
+  XEvent xlib_event_{};
+
+  // XProto event state.
+  int type_id_ = 0;
+  void (*deleter_)(void*) = nullptr;
+  void* event_ = nullptr;
+};
+
+}  // namespace x11
+
+#endif  // UI_GFX_X_EVENT_H_