VNC: Add support for capturing frame buffer to file each time it is changed.

When a change in the frame buffer from the VNC server is detected, the new
frame is stored out to the m5out/frames_*/ directory.  Specifiy the flag
"--frame-capture" when running configs/example/fs.py to enable this behavior.

--HG--
extra : rebase_source : d4e08e83f4fa6ff79f3dc9c433fc1f0487e057fc

1 files changed, 22 insertions, 0 deletions

diff --git a/src/base/vnc/vncserver.hh b/src/base/vnc/vncserver.hh
index 96dbdedda..33d833f26 100644
--- a/src/base/vnc/vncserver.hh
+++ b/src/base/vnc/vncserver.hh
@@ -48,6 +48,7 @@
 #include <iostream>
 
 #include "base/vnc/convert.hh"
+#include "base/bitmap.hh"
 #include "base/circlebuf.hh"
 #include "base/pollevent.hh"
 #include "base/socket.hh"
@@ -55,6 +56,7 @@
 #include "params/VncServer.hh"
 #include "sim/sim_object.hh"
 
+
 /**
  * A device that expects to receive input from the vnc server should derrive
  * (through mulitple inheritence if necessary from VncKeyboard or VncMouse
@@ -316,7 +318,25 @@ class VncServer : public SimObject
     /** The video converter that transforms data for us */
     VideoConvert *vc;
 
+    /** Flag indicating whether to capture snapshots of frame buffer or not */
+    bool captureEnabled;
+
+    /** Current frame number being captured to a file */
+    int captureCurrentFrame;
+
+    /** Directory to store captured frames to */
+    std::string captureOutputDirectory;
+
+    /** Computed hash of the last captured frame */
+    uint64_t captureLastHash;
+
+    /** Cached bitmap object for writing out frame buffers to file */
+    Bitmap *captureBitmap;
+
   protected:
+    /** Captures the current frame buffer to a file */
+    void captureFrameBuffer();
+
     /**
      * vnc client Interface
      */
@@ -449,6 +469,8 @@ class VncServer : public SimObject
     setDirty()
     {
         sendUpdate = true;
+        if (captureEnabled)
+            captureFrameBuffer();
         sendFrameBufferUpdate();
     }