New AutoSelect policy:

* Never autoselect ZRLE, chose Tight instead.

* Only select Hextile if we've been timing for at least a second.

* Start with full colour enabled. Turn full colour on/off as the
bandwidth changes. Note, however: This code is currently disabled. See
comment.

* Default to lowcolourlevel 2 instead of 1.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@49 3789f03b-4d11-0410-bbf8-ca57d06f2519

vncviewer/CViewOptions.cxx

@@ -35,13 +35,11 @@ static BoolParameter useLocalCursor("UseLocalCursor", "Render the mouse cursor l
 static BoolParameter useDesktopResize("UseDesktopResize", "Support dynamic desktop resizing", true);
 
 static BoolParameter fullColour("FullColour",
-                         "Use full colour (default is to use low colour "
-                         "unless auto select decides the link is fast enough)",
-                         false);
+				"Use full colour", true);
 static IntParameter lowColourLevel("LowColourLevel",
                          "Colour level to use on slow connections. "
                          "0 = Very Low (8 colours), 1 = Low (64 colours), 2 = Medium (256 colours)",
-                         1);
+                         2);
 static BoolParameter fullScreen("FullScreen",
                          "Use the whole display to show the remote desktop."
                          "(Press F8 to access the viewer menu)",

vncviewer/cview.cxx

@@ -1112,41 +1112,63 @@ CView::framebufferUpdateEnd() {
   showLocalCursor();
 }
 
+
+// Note: The method below is duplicated in vncviewer_unix/CConn.cxx!
+
 // autoSelectFormatAndEncoding() chooses the format and encoding appropriate
 // to the connection speed:
+//
 //   Above 16Mbps (timing for at least a second), same machine, switch to raw
 //   Above 3Mbps, switch to hextile
-//   Below 1.5Mbps, switch to ZRLE
-//   Above 1Mbps, switch to full colour mode
-void
+//   Otherwise, switch to Tight
+//
+//   Above 256Kbps, use full colour mode
+//
+void 
 CView::autoSelectFormatAndEncoding() {
   int kbitsPerSecond = sock->inStream().kbitsPerSecond();
   unsigned int newEncoding = options.preferredEncoding;
+  bool newFullColour = options.fullColour;
+  unsigned int timeWaited = sock->inStream().timeWaited();
 
-  if (kbitsPerSecond > 16000 && sameMachine &&
-      sock->inStream().timeWaited() >= 10000) {
+  // Select best encoding
+  if (kbitsPerSecond > 16000 && sameMachine && timeWaited >= 10000) {
     newEncoding = encodingRaw;
-  } else if (kbitsPerSecond > 3000) {
+  } else if (kbitsPerSecond > 3000 && timeWaited >= 10000) {
     newEncoding = encodingHextile;
-  } else if (kbitsPerSecond < 1500) {
-    newEncoding = encodingZRLE;
+  } else {
+    newEncoding = encodingTight;
   }
 
   if (newEncoding != options.preferredEncoding) {
     vlog.info("Throughput %d kbit/s - changing to %s encoding",
-            kbitsPerSecond, encodingName(newEncoding));
+              kbitsPerSecond, encodingName(newEncoding));
     options.preferredEncoding = newEncoding;
     encodingChange = true;
   }
 
-  if (kbitsPerSecond > 1000) {
-    if (!options.fullColour) {
-      vlog.info("Throughput %d kbit/s - changing to full colour",
-                kbitsPerSecond);
-      options.fullColour = true;
-      formatChange = true;
-    }
+  if (kbitsPerSecond == 0) {
+    return;
   }
+
+  // FIXME: The code below is currently disabled, since, as far as I
+  // understand, it is not possible to switch pixel format on the fly
+  // against TightVNC 1.2.X servers, for example. See mail to the
+  // mailing list, sent on 2004-12-21. If we cannot find any better
+  // solution, we could add code to only allow pixel format switching
+  // against VNC4 servers (if these don't use deferred updates).
+  
+#if 0
+  // Select best color level
+  newFullColour = (kbitsPerSecond > 256);
+  if (newFullColour != options.fullColour) {
+    vlog.info("Throughput %d kbit/s - full colour is now %s", 
+	      kbitsPerSecond,
+	      newFullColour ? "enabled" : "disabled");
+    options.fullColour = newFullColour;
+    formatChange = true;
+  } 
+#endif
 }
 
 void

vncviewer_unix/CConn.cxx

@@ -597,23 +597,30 @@ void CConn::reconfigureViewport()
   }
 }
 
+// Note: The method below is duplicated in vncviewer/cview.cxx!
+
 // autoSelectFormatAndEncoding() chooses the format and encoding appropriate
 // to the connection speed:
+//
 //   Above 16Mbps (timing for at least a second), same machine, switch to raw
 //   Above 3Mbps, switch to hextile
-//   Below 1.5Mbps, switch to Tight
-//   Above 1Mbps, switch to full colour mode
+//   Otherwise, switch to Tight
+//
+//   Above 256Kbps, use full colour mode
+//
 void CConn::autoSelectFormatAndEncoding()
 {
   int kbitsPerSecond = sock->inStream().kbitsPerSecond();
   unsigned int newEncoding = currentEncoding;
+  bool newFullColour = fullColour;
+  unsigned int timeWaited = sock->inStream().timeWaited();
 
-  if (kbitsPerSecond > 16000 && sameMachine &&
-      sock->inStream().timeWaited() >= 10000) {
+  // Select best encoding
+  if (kbitsPerSecond > 16000 && sameMachine && timeWaited >= 10000) {
     newEncoding = encodingRaw;
-  } else if (kbitsPerSecond > 3000) {
+  } else if (kbitsPerSecond > 3000 && timeWaited >= 10000) {
     newEncoding = encodingHextile;
-  } else if (kbitsPerSecond < 1500) {
+  } else {
     newEncoding = encodingTight;
   }
 
@@ -624,14 +631,28 @@ void CConn::autoSelectFormatAndEncoding()
     encodingChange = true;
   }
 
-  if (kbitsPerSecond > 1000) {
-    if (!fullColour) {
-      vlog.info("Throughput %d kbit/s - changing to full colour",
-                kbitsPerSecond);
-      fullColour = true;
-      formatChange = true;
-    }
+  if (kbitsPerSecond == 0) {
+    return;
   }
+
+  // FIXME: The code below is currently disabled, since, as far as I
+  // understand, it is not possible to switch pixel format on the fly
+  // against TightVNC 1.2.X servers, for example. See mail to the
+  // mailing list, sent on 2004-12-21. If we cannot find any better
+  // solution, we could add code to only allow pixel format switching
+  // against VNC4 servers (if these don't use deferred updates).
+  
+#if 0
+  // Select best color level
+  newFullColour = (kbitsPerSecond > 256);
+  if (newFullColour != fullColour) {
+    vlog.info("Throughput %d kbit/s - full colour is now %s", 
+	      kbitsPerSecond,
+	      newFullColour ? "enabled" : "disabled");
+    fullColour = newFullColour;
+    formatChange = true;
+  } 
+#endif
 }
 
 // checkEncodings() sends a setEncodings message if one is needed.

vncviewer_unix/vncviewer.cxx

@@ -59,14 +59,12 @@ BoolParameter dotWhenNoCursor("DotWhenNoCursor",
 BoolParameter autoSelect("AutoSelect",
                          "Auto select pixel format and encoding", true);
 BoolParameter fullColour("FullColour",
-                         "Use full colour - otherwise low colour level is used"
-                         " until AutoSelect decides the link is fast enough",
-                         false);
+                         "Use full colour", true);
 AliasParameter fullColor("FullColor", "Alias for FullColour", &fullColour);
 IntParameter lowColourLevel("LowColourLevel",
                             "Colour level to use on slow connections. "
                             "0 = Very Low (8 colours), 1 = Low (64 colours), "
-                            "2 = Medium (256 colours)", 1);
+                            "2 = Medium (256 colours)", 2);
 StringParameter preferredEncoding("PreferredEncoding",
                                   "Preferred encoding to use (ZRLE, hextile or"
                                   " raw) - implies AutoSelect=0", "");