Linux: server side backing stores

chrome/common/transport_dib.h

 // Copyright (c) 2006-2009 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 CHROME_COMMON_TRANSPORT_DIB_H_
 #define CHROME_COMMON_TRANSPORT_DIB_H_
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
 #include "base/shared_memory.h"
 #endif
 
 #if defined(OS_WIN)
 #include <windows.h>
+#elif defined(OS_LINUX)
+#include "chrome/common/x11_util.h"
 #endif
 
+namespace gfx {
+class Size;
+}
+
 // -----------------------------------------------------------------------------
 // A TransportDIB is a block of memory that is used to transport pixels
 // from the renderer process to the browser.
 // -----------------------------------------------------------------------------
 class TransportDIB {
  public:
   ~TransportDIB();
 
   // Two typedefs are defined. A Handle is the type which can be sent over
   // the wire so that the remote side can map the transport DIB. The Id typedef
@@ skipping 59 matching lines @@
   size_t size() const { return size_; }
 
   // Return the identifier which can be used to refer to this shared memory
   // on the wire.
   Id id() const;
 
   // Return a handle to the underlying shared memory. This can be sent over the
   // wire to give this transport DIB to another process.
   Handle handle() const;
 
+#if defined(OS_LINUX)
+  // Map the shared memory into the X server and return an id for the shared
+  // segment.
+  XID MapToX(Display* connection);
+#endif
+
  private:
   TransportDIB();
 #if defined(OS_WIN) || defined(OS_MACOSX)
   explicit TransportDIB(base::SharedMemoryHandle dib);
   base::SharedMemory shared_memory_;
   uint32 sequence_num_;
 #elif defined(OS_LINUX)
   int key_;  // SysV shared memory id
   void* address_;  // mapped address
+  XID x_shm_;  // X id for the shared segment
+  Display* display_;  // connection to the X server
 #endif
   size_t size_;  // length, in bytes
 };
 
 class MessageLoop;
 
 #endif  // CHROME_COMMON_TRANSPORT_DIB_H_