libvncclient: Add FinishedFrameBufferUpdate callback

When working on a program which searches the display for some image, one
does not want to search again without getting an FB update.  Add a
callback to make this possible.

libvncclient/rfbproto.c

@@ -1553,6 +1553,9 @@ HandleRFBServerMessage(rfbClient* client)
     if (!SendIncrementalFramebufferUpdateRequest(client))
       return FALSE;
 
+    if (client->FinishedFrameBufferUpdate)
+      client->FinishedFrameBufferUpdate(client);
+
     break;
   }
 

libvncclient/vncviewer.c

@@ -173,6 +173,7 @@ rfbClient* rfbGetClient(int bitsPerSample,int samplesPerPixel,
   client->SoftCursorLockArea = DummyRect;
   client->SoftCursorUnlockScreen = Dummy;
   client->GotFrameBufferUpdate = DummyRect;
+  client->FinishedFrameBufferUpdate = NULL;
   client->GetPassword = ReadPassword;
   client->MallocFrameBuffer = MallocFrameBuffer;
   client->Bell = Dummy;

rfb/rfbclient.h

@@ -107,6 +107,7 @@ typedef rfbBool (*HandleCursorPosProc)(struct _rfbClient* client, int x, int y);
 typedef void (*SoftCursorLockAreaProc)(struct _rfbClient* client, int x, int y, int w, int h);
 typedef void (*SoftCursorUnlockScreenProc)(struct _rfbClient* client);
 typedef void (*GotFrameBufferUpdateProc)(struct _rfbClient* client, int x, int y, int w, int h);
+typedef void (*FinishedFrameBufferUpdateProc)(struct _rfbClient* client);
 typedef char* (*GetPasswordProc)(struct _rfbClient* client);
 typedef rfbBool (*MallocFrameBufferProc)(struct _rfbClient* client);
 typedef void (*GotXCutTextProc)(struct _rfbClient* client, const char *text, int textlen);
@@ -228,6 +229,7 @@ typedef struct _rfbClient {
 	SoftCursorLockAreaProc SoftCursorLockArea;
 	SoftCursorUnlockScreenProc SoftCursorUnlockScreen;
 	GotFrameBufferUpdateProc GotFrameBufferUpdate;
+	FinishedFrameBufferUpdateProc FinishedFrameBufferUpdate;
 	/* the pointer returned by GetPassword will be freed after use! */
 	GetPasswordProc GetPassword;
 	MallocFrameBufferProc MallocFrameBuffer;