Add support for drawing video onto a Java ByteBuffer

remoting/client/jni/chromoting_jni.h

 // Copyright 2013 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 REMOTING_CLIENT_JNI_CHROMOTING_JNI_H_
 #define REMOTING_CLIENT_JNI_CHROMOTING_JNI_H_
 
 #include <jni.h>
 
 #include "base/at_exit.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "remoting/base/auto_thread.h"
+#include "remoting/client/jni/chromoting_jni_instance.h"
 #include "remoting/protocol/connection_to_host.h"
 
 template<typename T> struct DefaultSingletonTraits;
 
 namespace remoting {
-class ChromotingJniInstance;
 
 // Houses the global resources on which the Chromoting components run
 // (e.g. message loops and task runners). Proxies outgoing JNI calls from its
 // ChromotingJniInstance member to Java. All its methods should be invoked
-// exclusively from the UI thread.
+// exclusively from the UI thread unless otherwise noted.
 class ChromotingJni {
  public:
   // This class is instantiated at process initialization and persists until
   // we close. Its components are reused across |ChromotingJniInstance|s.
   static ChromotingJni* GetInstance();
 
   scoped_refptr<AutoThreadTaskRunner> ui_task_runner() {
     return ui_task_runner_;
   }
 
   scoped_refptr<AutoThreadTaskRunner> network_task_runner() {
     return network_task_runner_;
   }
 
   scoped_refptr<AutoThreadTaskRunner> display_task_runner() {
     return display_task_runner_;
   }
 
   scoped_refptr<net::URLRequestContextGetter> url_requester() {
     return url_requester_;
   }
 
-  // Initiates a connection with the specified host. Must only be called when
-  // |session_| is null (i.e. before any other call to Connect() or following
-  // a call to Disconnect()).
+  // Initiates a connection with the specified host. Only call when a host
+  // connection is active (i.e. between a call to Connect() and the
+  // corresponding call to Disconnect()).
   void ConnectToHost(const char* username,
                      const char* auth_token,
                      const char* host_jid,
                      const char* host_id,
                      const char* host_pubkey);
 
   // Terminates any ongoing connection attempt and cleans up by nullifying
   // |session_|. This is a no-op unless |session| is currently non-null.
   void DisconnectFromHost();
 
   // Returns the client for the currently-active session. Do not call if
   // |session| is null.
   scoped_refptr<ChromotingJniInstance> session() {
     DCHECK(session_);
     return session_;
   }
 
   // Notifies the user that the connection status has changed.
   void ReportConnectionStatus(protocol::ConnectionToHost::State state,
                               protocol::ErrorCode error);
 
   // Pops up a dialog box asking the user to enter a PIN.
   void DisplayAuthenticationPrompt();
 
+  // Updates image dimensions and canvas memory space. Call on display thread.
+  void UpdateImageBuffer(int width, int height, jobject buffer);
+
+  // Draws the latest image buffer onto the canvas. Call on the display thread.
+  void RedrawCanvas();
+
  private:
   ChromotingJni();
 
   // Forces a DisconnectFromHost() in case there is any active or failed
   // connection, then proceeds to tear down the Chromium dependencies on which
   // all sessions depended. Because destruction only occurs at application exit
   // after all connections have terminated, it is safe to make unretained
   // cross-thread calls on the class.
   virtual ~ChromotingJni();
 
@@ skipping 18 matching lines @@
   scoped_refptr<ChromotingJniInstance> session_;
 
   friend struct DefaultSingletonTraits<ChromotingJni>;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingJni);
 };
 
 }  // namespace remoting
 
 #endif