From f50bd7f9bf902790cee46a1753906d676fbf5f77 Mon Sep 17 00:00:00 2001
From: Constantin Kaplinsky <const@tightvnc.com>
Date: Thu, 10 Jan 2008 15:27:42 +0000
Subject: [PATCH] More debugging output can be enabled with the #define
 DEBUG_REPORT_CHANGED_TILES.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2399 3789f03b-4d11-0410-bbf8-ca57d06f2519
---
 unix/x0vncserver/PollingManager.cxx | 37 +++++++++++++++++++++++++++++
 unix/x0vncserver/PollingManager.h   |  3 +++
 2 files changed, 40 insertions(+)

diff --git a/unix/x0vncserver/PollingManager.cxx b/unix/x0vncserver/PollingManager.cxx
index 325bed1f..747817ad 100644
--- a/unix/x0vncserver/PollingManager.cxx
+++ b/unix/x0vncserver/PollingManager.cxx
@@ -199,6 +199,10 @@ bool PollingManager::pollScreen()
     pChangeFlags += m_widthTiles;
   }
 
+#ifdef DEBUG_REPORT_CHANGED_TILES
+  printChanges("After 1st pass", changeFlags);
+#endif
+
   // Do the work related to video area detection, if enabled.
   bool haveVideoRect = false;
   if ((int)m_videoPriority != 0) {
@@ -214,11 +218,20 @@ bool PollingManager::pollScreen()
     // Try to find more changes around. Before doing that, mark the
     // video area as changed, to skip comparisons of its pixels.
     flagVideoArea(changeFlags, true);
+#ifdef DEBUG_REPORT_CHANGED_TILES
+    printChanges("Before checking neighbors", changeFlags);
+#endif
     checkNeighbors(changeFlags);
+#ifdef DEBUG_REPORT_CHANGED_TILES
+    printChanges("After checking neighbors", changeFlags);
+#endif
 
     // Inform the server about the changes. This time, we mark the
     // video area as NOT changed, to prevent reading its pixels again.
     flagVideoArea(changeFlags, false);
+#ifdef DEBUG_REPORT_CHANGED_TILES
+    printChanges("Before sending", changeFlags);
+#endif
     nTilesChanged = sendChanges(changeFlags);
   }
 
@@ -421,6 +434,30 @@ PollingManager::checkNeighbors(bool *pChangeFlags)
   }
 }
 
+void
+PollingManager::printChanges(const char *header, const bool *pChangeFlags)
+{
+  fprintf(stderr, "%s:", header);
+
+  for (int y = 0; y < m_heightTiles; y++) {
+    for (int x = 0; x < m_widthTiles; x++) {
+      if (*pChangeFlags++) {
+        // Count successive tiles marked as changed.
+        int count = 1;
+        while (x + count < m_widthTiles && *pChangeFlags++) {
+          count++;
+        }
+        // Print.
+        fprintf(stderr, " (%d,%d)*%d", x, y, count);
+        // Skip processed tiles.
+        x += count;
+      }
+    }
+  }
+
+  fprintf(stderr, "\n");
+}
+
 void
 PollingManager::detectVideo()
 {
diff --git a/unix/x0vncserver/PollingManager.h b/unix/x0vncserver/PollingManager.h
index 27bbf0f5..b26e643f 100644
--- a/unix/x0vncserver/PollingManager.h
+++ b/unix/x0vncserver/PollingManager.h
@@ -106,6 +106,9 @@ private:
   // Check neighboring tiles and update pmxChanged[] matrix.
   void checkNeighbors(bool *pChangeFlags);
 
+  // DEBUG: Print the list of changed tiles.
+  void printChanges(const char *header, const bool *pChangeFlags);
+
   // Video detection functions.
   void detectVideo();
   void getVideoAreaRect(Rect *result);
-- 
2.39.5