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      1 /*
      2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_X11_SHARED_X_DISPLAY_H_
     12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_X11_SHARED_X_DISPLAY_H_
     13 
     14 #include <map>
     15 #include <vector>
     16 
     17 #include <assert.h>
     18 #include <X11/Xlib.h>
     19 
     20 #include <string>
     21 
     22 #include "webrtc/system_wrappers/interface/atomic32.h"
     23 #include "webrtc/system_wrappers/interface/scoped_refptr.h"
     24 
     25 namespace webrtc {
     26 
     27 // A ref-counted object to store XDisplay connection.
     28 class SharedXDisplay {
     29  public:
     30   class XEventHandler {
     31    public:
     32     virtual ~XEventHandler() {}
     33 
     34     // Processes XEvent. Returns true if the event has been handled.
     35     virtual bool HandleXEvent(const XEvent& event) = 0;
     36   };
     37 
     38   // Takes ownership of |display|.
     39   explicit SharedXDisplay(Display* display);
     40 
     41   // Creates a new X11 Display for the |display_name|. NULL is returned if X11
     42   // connection failed. Equivalent to CreateDefault() when |display_name| is
     43   // empty.
     44   static scoped_refptr<SharedXDisplay> Create(const std::string& display_name);
     45 
     46   // Creates X11 Display connection for the default display (e.g. specified in
     47   // DISPLAY). NULL is returned if X11 connection failed.
     48   static scoped_refptr<SharedXDisplay> CreateDefault();
     49 
     50   void AddRef() { ++ref_count_; }
     51   void Release() {
     52     if (--ref_count_ == 0)
     53       delete this;
     54   }
     55 
     56   Display* display() { return display_; }
     57 
     58   // Adds a new event |handler| for XEvent's of |type|.
     59   void AddEventHandler(int type, XEventHandler* handler);
     60 
     61   // Removes event |handler| added using |AddEventHandler|. Doesn't do anything
     62   // if |handler| is not registered.
     63   void RemoveEventHandler(int type, XEventHandler* handler);
     64 
     65   // Processes pending XEvents, calling corresponding event handlers.
     66   void ProcessPendingXEvents();
     67 
     68  private:
     69   typedef std::map<int, std::vector<XEventHandler*> > EventHandlersMap;
     70 
     71   ~SharedXDisplay();
     72 
     73   Atomic32 ref_count_;
     74   Display* display_;
     75 
     76   EventHandlersMap event_handlers_;
     77 
     78   DISALLOW_COPY_AND_ASSIGN(SharedXDisplay);
     79 };
     80 
     81 }  // namespace webrtc
     82 
     83 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_X11_SHARED_X_DISPLAY_H_
     84