Client Independent Server Side Scaling is now supported

Both PalmVNC and UltraVNC SetScale messages are supported

16 files changed, 594 insertions, 64 deletions

diff --git a/ChangeLog b/ChangeLog
index 81b6ec9..da59b24 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2006-05-03  Steven Carr <scarr@jsa-usa.com>
+	* Server Side Scaling is now supported in libvncserver
+	  Both PalmVNC and UltraVNC SetScale messages are supported
+
 2006-05-02  Steven Carr <scarr@jsa-usa.com>
 	* Ultra Encoding added.  Tested against UltraVNC V1.01
 	* libvncclient/rfbproto.c  CopyRectangle() BPP!=8 bug fixed.
diff --git a/libvncserver/Makefile.am b/libvncserver/Makefile.am
index 4ec7c39..8f66f64 100644
--- a/libvncserver/Makefile.am
+++ b/libvncserver/Makefile.am
@@ -19,7 +19,7 @@ include_HEADERS=../rfb/rfb.h ../rfb/rfbconfig.h ../rfb/rfbint.h \
 	../rfb/rfbproto.h ../rfb/keysym.h ../rfb/rfbregion.h ../rfb/rfbclient.h
 
 noinst_HEADERS=d3des.h ../rfb/default8x16.h zrleoutstream.h \
-	zrlepalettehelper.h zrletypes.h private.h minilzo.h lzoconf.h \
+	zrlepalettehelper.h zrletypes.h private.h minilzo.h lzoconf.h scale.h \
 	$(TIGHTVNCFILETRANSFERHDRS)
 
 EXTRA_DIST=tableinit24.c tableinittctemplate.c tabletranstemplate.c \
@@ -36,7 +36,7 @@ endif
 LIB_SRCS = main.c rfbserver.c rfbregion.c auth.c sockets.c \
 	stats.c corre.c hextile.c rre.c translate.c cutpaste.c \
 	httpd.c cursor.c font.c \
-	draw.c selbox.c d3des.c vncauth.c cargs.c minilzo.c ultra.c \
+	draw.c selbox.c d3des.c vncauth.c cargs.c minilzo.c ultra.c scale.c \
 	$(ZLIBSRCS) $(JPEGSRCS) $(TIGHTVNCFILETRANSFERSRCS)
 
 libvncserver_a_SOURCES=$(LIB_SRCS)
diff --git a/libvncserver/corre.c b/libvncserver/corre.c
index 058a77c..c1164c0 100755
--- a/libvncserver/corre.c
+++ b/libvncserver/corre.c
@@ -97,10 +97,10 @@ rfbSendSmallRectEncodingCoRRE(rfbClientPtr cl,
     rfbRREHeader hdr;
     int nSubrects;
     int i;
-    char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
-                   + (x * (cl->screen->bitsPerPixel / 8)));
+    char *fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
+                   + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
-    int maxRawSize = (cl->screen->width * cl->screen->height
+    int maxRawSize = (cl->scaledScreen->width * cl->scaledScreen->height
                       * (cl->format.bitsPerPixel / 8));
 
     if (rreBeforeBufSize < maxRawSize) {
@@ -121,7 +121,7 @@ rfbSendSmallRectEncodingCoRRE(rfbClientPtr cl,
 
     (*cl->translateFn)(cl->translateLookupTable,&(cl->screen->serverFormat),
                        &cl->format, fbptr, rreBeforeBuf,
-                       cl->screen->paddedWidthInBytes, w, h);
+                       cl->scaledScreen->paddedWidthInBytes, w, h);
 
     switch (cl->format.bitsPerPixel) {
     case 8:
diff --git a/libvncserver/cursor.c b/libvncserver/cursor.c
index d40fb76..2accc25 100644
--- a/libvncserver/cursor.c
+++ b/libvncserver/cursor.c
@@ -26,6 +26,8 @@
 #include <rfb/rfbregion.h>
 #include "private.h"
 
+void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2);
+
 /*
  * Send cursor shape either in X-style format or in client pixel format.
  */
@@ -42,6 +44,8 @@ rfbSendCursorShape(rfbClientPtr cl)
     uint8_t *bitmapData;
     uint8_t bitmapByte;
 
+    /* TODO: scale the cursor data to the correct size */
+
     pCursor = cl->screen->getCursorPtr(cl);
     /*if(!pCursor) return TRUE;*/
 
@@ -461,6 +465,9 @@ void rfbHideCursor(rfbClientPtr cl)
      memcpy(s->frameBuffer+(y1+j)*rowstride+x1*bpp,
 	    s->underCursorBuffer+j*x2*bpp,
 	    x2*bpp);
+
+   /* Copy to all scaled versions */
+   rfbScaledScreenUpdate(s, x1, y1, x1+x2, y1+y2);
    
    UNLOCK(s->cursorMutex);
 }
@@ -619,6 +626,9 @@ void rfbShowCursor(rfbClientPtr cl)
    		c->richSource+(j+j1)*c->width*bpp+(i+i1)*bpp,bpp);
    }
 
+   /* Copy to all scaled versions */
+   rfbScaledScreenUpdate(s, x1, y1, x1+x2, y1+y2);
+
    UNLOCK(s->cursorMutex);
 }
 
diff --git a/libvncserver/hextile.c b/libvncserver/hextile.c
index 70ee67f..cd598ac 100755
--- a/libvncserver/hextile.c
+++ b/libvncserver/hextile.c
@@ -126,12 +126,12 @@ sendHextiles##bpp(rfbClientPtr cl, int rx, int ry, int rw, int rh) {
                     return FALSE;                                               \
             }                                                                   \
                                                                                 \
-            fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)   \
-                     + (x * (cl->screen->bitsPerPixel / 8)));                   \
+            fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)   \
+                     + (x * (cl->scaledScreen->bitsPerPixel / 8)));                   \
                                                                                 \
             (*cl->translateFn)(cl->translateLookupTable, &(cl->screen->serverFormat),      \
                                &cl->format, fbptr, (char *)clientPixelData,     \
-                               cl->screen->paddedWidthInBytes, w, h);           \
+                               cl->scaledScreen->paddedWidthInBytes, w, h);           \
                                                                                 \
             startUblen = cl->ublen;                                             \
             cl->updateBuf[startUblen] = 0;                                      \
@@ -175,7 +175,7 @@ sendHextiles##bpp(rfbClientPtr cl, int rx, int ry, int rw, int rh) {
                 (*cl->translateFn)(cl->translateLookupTable,                    \
                                    &(cl->screen->serverFormat), &cl->format, fbptr,        \
                                    (char *)clientPixelData,                     \
-                                   cl->screen->paddedWidthInBytes, w, h);       \
+                                   cl->scaledScreen->paddedWidthInBytes, w, h);       \
                                                                                 \
                 memcpy(&cl->updateBuf[cl->ublen], (char *)clientPixelData,      \
                        w * h * (bpp/8));                                        \
diff --git a/libvncserver/main.c b/libvncserver/main.c
index 3aa9673..6a34980 100644
--- a/libvncserver/main.c
+++ b/libvncserver/main.c
@@ -48,9 +48,9 @@ static MUTEX(extMutex);
 static int rfbEnableLogging=1;
 
 #ifdef LIBVNCSERVER_WORDS_BIGENDIAN
-char rfbEndianTest = 0;
+char rfbEndianTest = (1==0);
 #else
-char rfbEndianTest = -1;
+char rfbEndianTest = (1==1);
 #endif
 
 /*
@@ -407,6 +407,7 @@ void rfbMarkRegionAsModified(rfbScreenInfoPtr screen,sraRegionPtr modRegion)
    rfbReleaseClientIterator(iterator);
 }
 
+void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2);
 void rfbMarkRectAsModified(rfbScreenInfoPtr screen,int x1,int y1,int x2,int y2)
 {
    sraRegionPtr region;
@@ -421,7 +422,10 @@ void rfbMarkRectAsModified(rfbScreenInfoPtr screen,int x1,int y1,int x2,int y2)
    if(y1<0) y1=0;
    if(y2>screen->height) y2=screen->height;
    if(y1==y2) return;
-   
+
+   /* update scaled copies for this rectangle */
+   rfbScaledScreenUpdate(screen,x1,y1,x2,y2);
+
    region = sraRgnCreateRect(x1,y1,x2,y2);
    rfbMarkRegionAsModified(screen,region);
    sraRgnDestroy(region);
@@ -959,6 +963,17 @@ void rfbScreenCleanup(rfbScreenInfoPtr screen)
 #ifdef LIBVNCSERVER_HAVE_LIBJPEG
   rfbTightCleanup(screen);
 #endif
+
+  /* free all 'scaled' versions of this screen */
+  while (screen->scaledScreenNext!=NULL)
+  {
+      rfbScreenInfoPtr ptr;
+      ptr = screen->scaledScreenNext;
+      screen->scaledScreenNext = ptr->scaledScreenNext;
+      free(ptr->frameBuffer);
+      free(ptr);
+  }
+
 #endif
   free(screen);
 }
diff --git a/libvncserver/rfbserver.c b/libvncserver/rfbserver.c
index 9c52382..d3e1fbb 100644
--- a/libvncserver/rfbserver.c
+++ b/libvncserver/rfbserver.c
@@ -65,6 +65,7 @@
 #define DEBUGPROTO(x)
 #endif
 
+#include <scale.h>
 
 static void rfbProcessClientProtocolVersion(rfbClientPtr cl);
 static void rfbProcessClientNormalMessage(rfbClientPtr cl);
@@ -250,6 +251,9 @@ rfbNewTCPOrUDPClient(rfbScreenInfoPtr rfbScreen,
     cl->screen = rfbScreen;
     cl->sock = sock;
     cl->viewOnly = FALSE;
+    /* setup pseudo scaling */
+    cl->scaledScreen = rfbScreen;
+    cl->scaledScreen->scaledScreenRefCount++;
 
     rfbResetStats(cl);
 
@@ -446,6 +450,9 @@ rfbClientConnectionGone(rfbClientPtr cl)
     if(cl->sock>0)
 	close(cl->sock);
 
+    if (cl->scaledScreen!=NULL)
+        cl->scaledScreen->scaledScreenRefCount--;
+
 #ifdef LIBVNCSERVER_HAVE_LIBZ
     rfbFreeZrleData(cl);
 #endif
@@ -711,21 +718,31 @@ rfbProcessClientInitMessage(rfbClientPtr cl)
     }
 }
 
+/* The values come in based on the scaled screen, we need to convert them to
+ * values based on the man screen's coordinate system
+ */
 static rfbBool rectSwapIfLEAndClip(uint16_t* x,uint16_t* y,uint16_t* w,uint16_t* h,
-		rfbScreenInfoPtr screen)
+		rfbClientPtr cl)
 {
-	*x=Swap16IfLE(*x);
-	*y=Swap16IfLE(*y);
-	*w=Swap16IfLE(*w);
-	*h=Swap16IfLE(*h);
-	if(*w>screen->width-*x)
-		*w=screen->width-*x;
+	int x1=Swap16IfLE(*x);
+	int y1=Swap16IfLE(*y);
+	int w1=Swap16IfLE(*w);
+	int h1=Swap16IfLE(*h);
+
+	rfbScaledCorrection(cl->scaledScreen, cl->screen, &x1, &y1, &w1, &h1, "rectSwapIfLEAndClip");
+	*x = x1;
+	*y = y1;
+	*w = w1;
+	*h = h1;
+
+	if(*w>cl->screen->width-*x)
+		*w=cl->screen->width-*x;
 	/* possible underflow */
-	if(*w>screen->width-*x)
+	if(*w>cl->screen->width-*x)
 		return FALSE;
-	if(*h>screen->height-*y)
-		*h=screen->height-*y;
-	if(*h>screen->height-*y)
+	if(*h>cl->screen->height-*y)
+		*h=cl->screen->height-*y;
+	if(*h>cl->screen->height-*y)
 		return FALSE;
 
 	return TRUE;
@@ -1062,10 +1079,17 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
             return;
         }
 
-	if(!rectSwapIfLEAndClip(&msg.fur.x,&msg.fur.y,&msg.fur.w,&msg.fur.h,
-			cl->screen))
-		return;
 
+        /* The values come in based on the scaled screen, we need to convert them to
+         * values based on the main screen's coordinate system
+         */
+	if(!rectSwapIfLEAndClip(&msg.fur.x,&msg.fur.y,&msg.fur.w,&msg.fur.h,cl))
+	{
+	        rfbLog("Warning, ignoring rfbFramebufferUpdateRequest: %dXx%dY-%dWx%dH\n",msg.fur.x, msg.fur.y, msg.fur.w, msg.fur.h);
+		return;
+        }
+ 
+        
 	tmpRegion =
 	  sraRgnCreateRect(msg.fur.x,
 			   msg.fur.y,
@@ -1142,18 +1166,19 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
 	    if (msg.pe.buttonMask != cl->lastPtrButtons ||
 		    cl->screen->deferPtrUpdateTime == 0) {
 		cl->screen->ptrAddEvent(msg.pe.buttonMask,
-			Swap16IfLE(msg.pe.x), Swap16IfLE(msg.pe.y), cl);
+			ScaleX(cl->scaledScreen, cl->screen, Swap16IfLE(msg.pe.x)), 
+			ScaleY(cl->scaledScreen, cl->screen, Swap16IfLE(msg.pe.y)),
+			cl);
 		cl->lastPtrButtons = msg.pe.buttonMask;
 	    } else {
-		cl->lastPtrX = Swap16IfLE(msg.pe.x);
-		cl->lastPtrY = Swap16IfLE(msg.pe.y);
+		cl->lastPtrX = ScaleX(cl->scaledScreen, cl->screen, Swap16IfLE(msg.pe.x));
+		cl->lastPtrY = ScaleY(cl->scaledScreen, cl->screen, Swap16IfLE(msg.pe.y));
 		cl->lastPtrButtons = msg.pe.buttonMask;
 	    }
       }      
       return;
 
 
-
     case rfbClientCutText:
 
 	if ((n = rfbReadExact(cl, ((char *)&msg) + 1,
@@ -1183,6 +1208,23 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
 
         return;
 
+    case rfbPalmVNCSetScaleFactor:
+      cl->PalmVNC = TRUE;
+    case rfbSetScale:
+
+      if ((n = rfbReadExact(cl, ((char *)&msg) + 1,
+          sz_rfbSetScaleMsg - 1)) <= 0) {
+          if (n != 0)
+            rfbLogPerror("rfbProcessClientNormalMessage: read");
+          rfbCloseClient(cl);
+          return;
+      }
+      rfbLog("rfbSetScale(%d)\n", msg.ssc.scale);
+      rfbScalingSetup(cl,cl->screen->width/msg.ssc.scale, cl->screen->height/msg.ssc.scale);
+
+      rfbSendNewScaleSize(cl);
+
+      return;
 
     default:
 	{
@@ -1245,7 +1287,7 @@ rfbSendFramebufferUpdate(rfbClientPtr cl,
       fu->type = rfbFramebufferUpdate;
       fu->nRects = Swap16IfLE(1);
       cl->ublen = sz_rfbFramebufferUpdateMsg;
-      if (!rfbSendNewFBSize(cl, cl->screen->width, cl->screen->height)) {
+      if (!rfbSendNewFBSize(cl, cl->scaledScreen->width, cl->scaledScreen->height)) {
         return FALSE;
       }
       return rfbSendUpdateBuf(cl);
@@ -1401,6 +1443,9 @@ rfbSendFramebufferUpdate(rfbClientPtr cl,
             int y = rect.y1;
             int w = rect.x2 - x;
             int h = rect.y2 - y;
+            /* We need to count the number of rects in the scaled screen */
+            if (cl->screen!=cl->scaledScreen)
+                rfbScaledCorrection(cl->screen, cl->scaledScreen, &x, &y, &w, &h, "rfbSendFramebufferUpdate");
 	    int rectsPerRow = (w-1)/cl->correMaxWidth+1;
 	    int rows = (h-1)/cl->correMaxHeight+1;
 	    nUpdateRegionRects += rectsPerRow*rows;
@@ -1414,6 +1459,9 @@ rfbSendFramebufferUpdate(rfbClientPtr cl,
             int y = rect.y1;
             int w = rect.x2 - x;
             int h = rect.y2 - y;
+            /* We need to count the number of rects in the scaled screen */
+            if (cl->screen!=cl->scaledScreen)
+                rfbScaledCorrection(cl->screen, cl->scaledScreen, &x, &y, &w, &h, "rfbSendFramebufferUpdate");
             nUpdateRegionRects += (((h-1) / (ULTRA_MAX_SIZE( w ) / w)) + 1);
           }
         sraRgnReleaseIterator(i);
@@ -1426,6 +1474,9 @@ rfbSendFramebufferUpdate(rfbClientPtr cl,
             int y = rect.y1;
             int w = rect.x2 - x;
             int h = rect.y2 - y;
+            /* We need to count the number of rects in the scaled screen */
+            if (cl->screen!=cl->scaledScreen)
+                rfbScaledCorrection(cl->screen, cl->scaledScreen, &x, &y, &w, &h, "rfbSendFramebufferUpdate");
 	    nUpdateRegionRects += (((h-1) / (ZLIB_MAX_SIZE( w ) / w)) + 1);
 	}
 	sraRgnReleaseIterator(i);
@@ -1438,6 +1489,9 @@ rfbSendFramebufferUpdate(rfbClientPtr cl,
             int y = rect.y1;
             int w = rect.x2 - x;
             int h = rect.y2 - y;
+            /* We need to count the number of rects in the scaled screen */
+            if (cl->screen!=cl->scaledScreen)
+                rfbScaledCorrection(cl->screen, cl->scaledScreen, &x, &y, &w, &h, "rfbSendFramebufferUpdate");
 	    int n = rfbNumCodedRectsTight(cl, x, y, w, h);
 	    if (n == 0) {
 		nUpdateRegionRects = 0xFFFF;
@@ -1509,6 +1563,10 @@ rfbSendFramebufferUpdate(rfbClientPtr cl,
         int w = rect.x2 - x;
         int h = rect.y2 - y;
 
+        /* We need to count the number of rects in the scaled screen */
+        if (cl->screen!=cl->scaledScreen)
+            rfbScaledCorrection(cl->screen, cl->scaledScreen, &x, &y, &w, &h, "rfbSendFramebufferUpdate");
+
         cl->rawBytesEquivalent += (sz_rfbFramebufferUpdateRectHeader
                                       + w * (cl->format.bitsPerPixel / 8) * h);
 
@@ -1598,12 +1656,19 @@ rfbSendCopyRegion(rfbClientPtr cl,
     /* printf("copyrect: "); sraRgnPrint(reg); putchar('\n');fflush(stdout); */
     i = sraRgnGetReverseIterator(reg,dx>0,dy>0);
 
+    /* correct for the scale of the screen */
+    dx = ScaleX(cl->screen, cl->scaledScreen, dx);
+    dy = ScaleX(cl->screen, cl->scaledScreen, dy);
+
     while(sraRgnIteratorNext(i,&rect1)) {
       x = rect1.x1;
       y = rect1.y1;
       w = rect1.x2 - x;
       h = rect1.y2 - y;
 
+      /* correct for scaling (if necessary) */
+      rfbScaledCorrection(cl->screen, cl->scaledScreen, &x, &y, &w, &h, "copyrect");
+
       rect.r.x = Swap16IfLE(x);
       rect.r.y = Swap16IfLE(y);
       rect.r.w = Swap16IfLE(w);
@@ -1644,8 +1709,8 @@ rfbSendRectEncodingRaw(rfbClientPtr cl,
     rfbFramebufferUpdateRectHeader rect;
     int nlines;
     int bytesPerLine = w * (cl->format.bitsPerPixel / 8);
-    char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
-                   + (x * (cl->screen->bitsPerPixel / 8)));
+    char *fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
+                   + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
     /* Flush the buffer to guarantee correct alignment for translateFn(). */
     if (cl->ublen > 0) {
@@ -1675,7 +1740,7 @@ rfbSendRectEncodingRaw(rfbClientPtr cl,
         (*cl->translateFn)(cl->translateLookupTable,
 			   &(cl->screen->serverFormat),
                            &cl->format, fbptr, &cl->updateBuf[cl->ublen],
-                           cl->screen->paddedWidthInBytes, w, nlines);
+                           cl->scaledScreen->paddedWidthInBytes, w, nlines);
 
         cl->ublen += nlines * bytesPerLine;
         h -= nlines;
@@ -1688,7 +1753,7 @@ rfbSendRectEncodingRaw(rfbClientPtr cl,
         if (!rfbSendUpdateBuf(cl))
             return FALSE;
 
-        fbptr += (cl->screen->paddedWidthInBytes * nlines);
+        fbptr += (cl->scaledScreen->paddedWidthInBytes * nlines);
 
         nlines = (UPDATE_BUF_SIZE - cl->ublen) / bytesPerLine;
         if (nlines == 0) {
@@ -1752,6 +1817,11 @@ rfbSendNewFBSize(rfbClientPtr cl,
 	    return FALSE;
     }
 
+    if (cl->PalmVNC==TRUE)
+        rfbLog("Sending a rfbEncodingNewFBSize in response to a PalmVNC  style frameuffer resize request (%dx%d)\n", w, h);
+    else
+        rfbLog("Sending a rfbEncodingNewFBSize in response to a UltraVNC style frameuffer resize request (%dx%d)\n", w, h);
+
     rect.encoding = Swap32IfLE(rfbEncodingNewFBSize);
     rect.r.x = 0;
     rect.r.y = 0;
diff --git a/libvncserver/rre.c b/libvncserver/rre.c
index ca11bb3..8ef91fd 100755
--- a/libvncserver/rre.c
+++ b/libvncserver/rre.c
@@ -63,10 +63,10 @@ rfbSendRectEncodingRRE(rfbClientPtr cl,
     rfbRREHeader hdr;
     int nSubrects;
     int i;
-    char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
-                   + (x * (cl->screen->bitsPerPixel / 8)));
+    char *fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
+                   + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
-    int maxRawSize = (cl->screen->width * cl->screen->height
+    int maxRawSize = (cl->scaledScreen->width * cl->scaledScreen->height
                       * (cl->format.bitsPerPixel / 8));
 
     if (rreBeforeBufSize < maxRawSize) {
@@ -88,7 +88,7 @@ rfbSendRectEncodingRRE(rfbClientPtr cl,
     (*cl->translateFn)(cl->translateLookupTable,
 		       &(cl->screen->serverFormat),
                        &cl->format, fbptr, rreBeforeBuf,
-                       cl->screen->paddedWidthInBytes, w, h);
+                       cl->scaledScreen->paddedWidthInBytes, w, h);
 
     switch (cl->format.bitsPerPixel) {
     case 8:
diff --git a/libvncserver/scale.c b/libvncserver/scale.c
new file mode 100644
index 0000000..44d1d11
--- /dev/null
+++ b/libvncserver/scale.c
@@ -0,0 +1,411 @@
+/*
+ * scale.c - deal with server-side scaling.
+ */
+
+/*
+ *  Copyright (C) 2005 Rohit Kumar, Johannes E. Schindelin
+ *  Copyright (C) 2002 RealVNC Ltd.
+ *  OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
+ *  Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge.  
+ *  All Rights Reserved.
+ *
+ *  This is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This software is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this software; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ *  USA.
+ */
+
+#ifdef __STRICT_ANSI__
+#define _BSD_SOURCE
+#endif
+#include <string.h>
+#include <rfb/rfb.h>
+#include <rfb/rfbregion.h>
+#include "private.h"
+
+#ifdef LIBVNCSERVER_HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#ifdef WIN32
+#define write(sock,buf,len) send(sock,buf,len,0)
+#else
+#ifdef LIBVNCSERVER_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <pwd.h>
+#ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef LIBVNCSERVER_HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#endif
+#endif
+
+#ifdef CORBA
+#include <vncserverctrl.h>
+#endif
+
+#ifdef DEBUGPROTO
+#undef DEBUGPROTO
+#define DEBUGPROTO(x) x
+#else
+#define DEBUGPROTO(x)
+#endif
+
+/****************************/
+#include <math.h>
+
+int ScaleX(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int x)
+{
+    if ((from==to) || (from==NULL) || (to==NULL)) return x;
+    return ((int)(((double) x / (double)from->width) * (double)to->width ));
+}
+
+int ScaleY(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int y)
+{
+    if ((from==to) || (from==NULL) || (to==NULL)) return y;
+    return ((int)(((double) y / (double)from->height) * (double)to->height ));
+}
+
+/* So, all of the encodings point to the ->screen->frameBuffer,
+ * We need to change this!
+ */
+void rfbScaledCorrection(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int *x, int *y, int *w, int *h, char *function)
+{
+    double x1,y1,w1,h1, x2, y2, w2, h2;
+    double scaleW = ((double) to->width) / ((double) from->width);
+    double scaleH = ((double) to->height) / ((double) from->height);
+
+
+    /*
+     * rfbLog("rfbScaledCorrection(%p -> %p, %dx%d->%dx%d (%dXx%dY-%dWx%dH)\n",
+     * from, to, from->width, from->height, to->width, to->height, *x, *y, *w, *h);
+     */
+
+    /* If it's the original framebuffer... */
+    if (from==to) return;
+
+    x1 = ((double) *x) * scaleW;
+    y1 = ((double) *y) * scaleH;
+    w1 = ((double) *w) * scaleW;
+    h1 = ((double) *h) * scaleH;
+
+
+    /*cast from double to int is same as "*x = floor(x1);" */
+    x2 = floor(x1);
+    y2 = floor(y1);
+
+    /* include into W and H the jitter of scaling X and Y */
+    w2 = ceil(w1 + ( x1 - x2 ));
+    h2 = ceil(h1 + ( y1 - y2 ));
+
+    /*
+     * rfbLog("%s (%dXx%dY-%dWx%dH  ->  %fXx%fY-%fWx%fH) {%dWx%dH -> %dWx%dH}\n",
+     *    function, *x, *y, *w, *h, x2, y2, w2, h2,
+     *    from->width, from->height, to->width, to->height);
+     */
+
+    /* simulate ceil() without math library */
+    *x = (int)x2;
+    *y = (int)y2;
+    *w = (int)w2;
+    *h = (int)h2;
+
+    /* Small changes for a thumbnail may be scaled to zero */
+    if (*w==0) *w++;
+    if (*h==0) *h++;
+    /* scaling from small to big may overstep the size a bit */
+    if (*x+*w > to->width)  *w=to->width - *x;
+    if (*y+*h > to->height) *h=to->height - *y;
+}
+
+void rfbScaledScreenUpdateRect(rfbScreenInfoPtr screen, rfbScreenInfoPtr ptr, int x0, int y0, int w0, int h0)
+{
+    int x,y,w,v,z;
+    int x1, y1, w1, h1;
+    int bitsPerPixel, bytesPerPixel, bytesPerLine, areaX, areaY, area2;
+    unsigned char *srcptr, *dstptr;
+
+    /* Nothing to do!!! */
+    if (screen==ptr) return;
+
+    x1 = x0;
+    y1 = y0;
+    w1 = w0;
+    h1 = h0;
+
+    rfbScaledCorrection(screen, ptr, &x1, &y1, &w1, &h1, "rfbScaledScreenUpdateRect");
+
+    bitsPerPixel = screen->bitsPerPixel;
+    bytesPerPixel = bitsPerPixel / 8;
+    bytesPerLine = w1 * bytesPerPixel;
+    srcptr = (unsigned char *)(screen->frameBuffer +
+     (y0 * screen->paddedWidthInBytes + x0 * bytesPerPixel));
+    dstptr = (unsigned char *)(ptr->frameBuffer +
+     ( y1 * ptr->paddedWidthInBytes + x1 * bytesPerPixel));
+    /* The area of the source framebuffer for each destination pixel */
+    areaX = ScaleX(ptr,screen,1);
+    areaY = ScaleY(ptr,screen,1);
+    area2 = areaX*areaY;
+
+
+    /* Ensure that we do not go out of bounds */
+    if ((x1+w1) > (ptr->width))
+    {
+      if (x1==0) w1=ptr->width; else x1 = ptr->width - w1;
+    }
+    if ((y1+h1) > (ptr->height))
+    {
+      if (y1==0) h1=ptr->height; else y1 = ptr->height - h1;
+    }
+    /*
+     * rfbLog("rfbScaledScreenUpdateRect(%dXx%dY-%dWx%dH  ->  %dXx%dY-%dWx%dH <%dx%d>) {%dWx%dH -> %dWx%dH} 0x%p\n",
+     *    x0, y0, w0, h0, x1, y1, w1, h1, areaX, areaY,
+     *    screen->width, screen->height, ptr->width, ptr->height, ptr->frameBuffer);
+     */
+
+    if (screen->serverFormat.trueColour) { /* Blend neighbouring pixels together */
+      unsigned char *srcptr2;
+      unsigned long pixel_value, red, green, blue;
+      unsigned int redShift = screen->serverFormat.redShift;
+      unsigned int greenShift = screen->serverFormat.greenShift;
+      unsigned int blueShift = screen->serverFormat.blueShift;
+      unsigned long redMax = screen->serverFormat.redMax;
+      unsigned long greenMax = screen->serverFormat.greenMax;
+      unsigned long blueMax = screen->serverFormat.blueMax;
+
+     /* for each *destination* pixel... */
+     for (y = 0; y < h1; y++) {
+       for (x = 0; x < w1; x++) {
+         red = green = blue = 0;
+         /* Get the totals for rgb from the source grid... */
+         for (w = 0; w < areaX; w++) {
+           for (v = 0; v < areaY; v++) {
+             srcptr2 = &srcptr[(((x * areaX) + v) * bytesPerPixel) +
+                               (w * screen->paddedWidthInBytes)];
+             pixel_value = 0;
+
+
+             switch (bytesPerPixel) {
+             case 4: pixel_value = *((unsigned int *)srcptr2);   break;
+             case 2: pixel_value = *((unsigned short *)srcptr2); break;
+             case 1: pixel_value = *((unsigned char *)srcptr2);  break;
+             default:
+               /* fixme: endianess problem? */
+               for (z = 0; z < bytesPerPixel; z++)
+                 pixel_value += (srcptr2[z] << (8 * z));
+                break;
+              }
+              //srcptr2 += bytesPerPixel;
+
+            red += ((pixel_value >> redShift) & redMax);
+            green += ((pixel_value >> greenShift) & greenMax);
+            blue += ((pixel_value >> blueShift) & blueMax);
+
+           }
+         }
+         /* We now have a total for all of the colors, find the average! */
+         red /= area2;
+         green /= area2;
+         blue /= area2;
+          /* Stuff the new value back into memory */
+         pixel_value = ((red & redMax) << redShift) | ((green & greenMax) << greenShift) | ((blue & blueMax) << blueShift);
+
+         switch (bytesPerPixel) {
+         case 4: *((unsigned int *)dstptr)   = (unsigned int)   pixel_value; break;
+         case 2: *((unsigned short *)dstptr) = (unsigned short) pixel_value; break;
+         case 1: *((unsigned char *)dstptr)  = (unsigned char)  pixel_value; break;
+         default:
+           /* fixme: endianess problem? */
+           for (z = 0; z < bytesPerPixel; z++)
+             dstptr[z]=(pixel_value >> (8 * z)) & 0xff;
+            break;
+          }
+          dstptr += bytesPerPixel;
+       }
+       srcptr += (screen->paddedWidthInBytes * areaY);
+       dstptr += (ptr->paddedWidthInBytes - bytesPerLine);
+     }
+   } else
+   { /* Not truecolour, so we can't blend. Just use the top-left pixel instead */
+     for (y = y1; y < (y1+h1); y++) {
+       for (x = x1; x < (x1+w1); x++)
+         memcpy (&ptr->frameBuffer[(y *ptr->paddedWidthInBytes) + (x * bytesPerPixel)],
+                 &screen->frameBuffer[(y * areaY * screen->paddedWidthInBytes) + (x *areaX * bytesPerPixel)], bytesPerPixel);
+     }
+  }
+}
+
+void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2)
+{
+    /* ok, now the task is to update each and every scaled version of the framebuffer
+     * and we only have to do this for this specific changed rectangle!
+     */
+    rfbScreenInfoPtr ptr;
+    int count=0;
+
+    /* We don't point to cl->screen as it is the original */
+    for (ptr=screen->scaledScreenNext;ptr!=NULL;ptr=ptr->scaledScreenNext)
+    {
+        /* Only update if it has active clients... */
+        if (ptr->scaledScreenRefCount>0)
+        {
+          rfbScaledScreenUpdateRect(screen, ptr, x1, y1, x2-x1, y2-y1);
+          count++;
+        }
+    }
+}
+
+/* Create a new scaled version of the framebuffer */
+rfbScreenInfoPtr rfbScaledScreenAllocate(rfbClientPtr cl, int width, int height)
+{
+    rfbScreenInfoPtr ptr;
+    ptr = malloc(sizeof(rfbScreenInfo));
+    if (ptr!=NULL)
+    {
+        /* copy *everything* (we don't use most of it, but just in case) */
+        memcpy(ptr, cl->screen, sizeof(rfbScreenInfo));
+        ptr->width = width;
+        ptr->height = height;
+        ptr->paddedWidthInBytes = (ptr->bitsPerPixel/8)*ptr->width;
+
+        /* Need to by multiples of 4 for Sparc systems */
+        ptr->paddedWidthInBytes += (ptr->paddedWidthInBytes % 4);
+
+        /* Reset the reference count to 0! */
+        ptr->scaledScreenRefCount = 0;
+
+        ptr->sizeInBytes = ptr->paddedWidthInBytes * ptr->height;
+        ptr->serverFormat = cl->screen->serverFormat;
+
+        ptr->frameBuffer = malloc(ptr->sizeInBytes);
+        if (ptr->frameBuffer!=NULL)
+        {
+            /* Reset to a known condition: scale the entire framebuffer */
+            rfbScaledScreenUpdateRect(cl->screen, ptr, 0, 0, cl->screen->width, cl->screen->height);
+            /* Now, insert into the chain */
+            LOCK(cl->updateMutex);
+            ptr->scaledScreenNext = cl->screen->scaledScreenNext;
+            cl->screen->scaledScreenNext = ptr;
+            UNLOCK(cl->updateMutex);
+        }
+        else
+        {
+            /* Failed to malloc the new frameBuffer, cleanup */
+            free(ptr);
+            ptr=NULL;
+        }
+    }
+    return ptr;
+}
+
+/* Find an active scaled version of the framebuffer
+ * TODO: implement a refcount per scaled screen to prevent
+ * unreferenced scaled screens from hanging around
+ */
+rfbScreenInfoPtr rfbScalingFind(rfbClientPtr cl, int width, int height)
+{
+    rfbScreenInfoPtr ptr;
+    /* include the original in the search (ie: fine 1:1 scaled version of the frameBuffer) */
+    for (ptr=cl->screen; ptr!=NULL; ptr=ptr->scaledScreenNext)
+    {
+        if ((ptr->width==width) && (ptr->height==height))
+            return ptr;
+    }
+    return NULL;
+}
+
+/* Future needs "scale to 320x240, as that's the client's screen size */
+void rfbScalingSetup(rfbClientPtr cl, int width, int height)
+{
+    rfbScreenInfoPtr ptr;
+
+    ptr = rfbScalingFind(cl,width,height);
+    if (ptr==NULL)
+        ptr = rfbScaledScreenAllocate(cl,width,height);
+    /* Now, there is a new screen available (if ptr is not NULL) */
+    if (ptr!=NULL)
+    {
+        /* Update it! */
+        if (ptr->scaledScreenRefCount<1)
+            rfbScaledScreenUpdateRect(cl->screen, ptr, 0, 0, cl->screen->width, cl->screen->height);
+        /*
+         * rfbLog("Taking one from %dx%d-%d and adding it to %dx%d-%d\n",
+         *    cl->scaledScreen->width, cl->scaledScreen->height,
+         *    cl->scaledScreen->scaledScreenRefCount,
+         *    ptr->width, ptr->height, ptr->scaledScreenRefCount);
+         */
+
+        LOCK(cl->updateMutex);
+        cl->scaledScreen->scaledScreenRefCount--;
+        ptr->scaledScreenRefCount++;
+        cl->scaledScreen=ptr;
+        cl->newFBSizePending = TRUE;
+        UNLOCK(cl->updateMutex);
+
+        rfbLog("Scaling to %dx%d (refcount=%d)\n",width,height,ptr->scaledScreenRefCount);
+    }
+    else
+        rfbLog("Scaling to %dx%d failed, leaving things alone\n",width,height);
+}
+
+int rfbSendNewScaleSize(rfbClientPtr cl)
+{
+    /* if the client supports newFBsize Encoding, use it */
+    if (cl->useNewFBSize && cl->newFBSizePending)
+	return FALSE;
+
+    LOCK(cl->updateMutex);
+    cl->newFBSizePending = FALSE;
+    UNLOCK(cl->updateMutex);
+
+    if (cl->PalmVNC==TRUE)
+    {
+        rfbPalmVNCReSizeFrameBufferMsg pmsg;
+        pmsg.type = rfbPalmVNCReSizeFrameBuffer;
+        pmsg.pad1 = 0;
+        pmsg.desktop_w = Swap16IfLE(cl->screen->width);
+        pmsg.desktop_h = Swap16IfLE(cl->screen->height);
+        pmsg.buffer_w  = Swap16IfLE(cl->scaledScreen->width);
+        pmsg.buffer_h  = Swap16IfLE(cl->scaledScreen->height);
+        pmsg.pad2 = 0;
+
+        rfbLog("Sending a response to a PalmVNC style frameuffer resize event (%dx%d)\n", cl->scaledScreen->width, cl->scaledScreen->height);
+        if (rfbWriteExact(cl, (char *)&pmsg, sz_rfbPalmVNCReSizeFrameBufferMsg) < 0) {
+            rfbLogPerror("rfbNewClient: write");
+            rfbCloseClient(cl);
+            rfbClientConnectionGone(cl);
+            return FALSE;
+        }
+    }
+    else
+    {
+        rfbResizeFrameBufferMsg        rmsg;
+        rmsg.type = rfbResizeFrameBuffer;
+        rmsg.pad1=0;
+        rmsg.framebufferWidth  = Swap16IfLE(cl->scaledScreen->width);
+        rmsg.framebufferHeigth = Swap16IfLE(cl->scaledScreen->height);
+        rfbLog("Sending a response to a UltraVNC style frameuffer resize event (%dx%d)\n", cl->scaledScreen->width, cl->scaledScreen->height);
+        if (rfbWriteExact(cl, (char *)&rmsg, sz_rfbResizeFrameBufferMsg) < 0) {
+            rfbLogPerror("rfbNewClient: write");
+            rfbCloseClient(cl);
+            rfbClientConnectionGone(cl);
+            return FALSE;
+        }
+    }
+    return TRUE;
+}
+/****************************/
diff --git a/libvncserver/scale.h b/libvncserver/scale.h
new file mode 100644
index 0000000..13dd942
--- /dev/null
+++ b/libvncserver/scale.h
@@ -0,0 +1,10 @@
+
+int ScaleX(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int x);
+int ScaleY(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int y);
+void rfbScaledCorrection(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int *x, int *y, int *w, int *h, char *function);
+void rfbScaledScreenUpdateRect(rfbScreenInfoPtr screen, rfbScreenInfoPtr ptr, int x0, int y0, int w0, int h0);
+void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2);
+rfbScreenInfoPtr rfbScaledScreenAllocate(rfbClientPtr cl, int width, int height);
+rfbScreenInfoPtr rfbScalingFind(rfbClientPtr cl, int width, int height);
+void rfbScalingSetup(rfbClientPtr cl, int width, int height);
+int rfbSendNewScaleSize(rfbClientPtr cl);
diff --git a/libvncserver/stats.c b/libvncserver/stats.c
index 969eeed..ed9a3d0 100755
--- a/libvncserver/stats.c
+++ b/libvncserver/stats.c
@@ -28,7 +28,7 @@
 
 static const char* encNames[] = {
     "raw", "copyRect", "RRE", "[encoding 3]", "CoRRE", "hextile",
-    "zlib", "tight", "[encoding 8]", "[encoding 9]", "[encoding 10]",
+    "zlib", "tight", "[encoding 8]", "ultra", "[encoding 10]",
     "[encoding 11]", "[encoding 12]", "[encoding 13]", "[encoding 14]",
     "[encoding 15]",
     "ZRLE", "[encoding 17]", "[encoding 18]", "[encoding 19]", "[encoding 20]"
diff --git a/libvncserver/tight.c b/libvncserver/tight.c
index 4d76e8f..71ce0d9 100644
--- a/libvncserver/tight.c
+++ b/libvncserver/tight.c
@@ -332,13 +332,13 @@ rfbSendRectEncodingTight(rfbClientPtr cl,
                 if (!SendTightHeader(cl, x_best, y_best, w_best, h_best))
                     return FALSE;
 
-                fbptr = (cl->screen->frameBuffer +
-                         (cl->screen->paddedWidthInBytes * y_best) +
-                         (x_best * (cl->screen->bitsPerPixel / 8)));
+                fbptr = (cl->scaledScreen->frameBuffer +
+                         (cl->scaledScreen->paddedWidthInBytes * y_best) +
+                         (x_best * (cl->scaledScreen->bitsPerPixel / 8)));
 
                 (*cl->translateFn)(cl->translateLookupTable, &cl->screen->serverFormat,
                                    &cl->format, fbptr, tightBeforeBuf,
-                                   cl->screen->paddedWidthInBytes, 1, 1);
+                                   cl->scaledScreen->paddedWidthInBytes, 1, 1);
 
                 if (!SendSolidRect(cl))
                     return FALSE;
@@ -486,7 +486,7 @@ CheckSolidTile##bpp(rfbClientPtr cl, int x, int y, int w, int h,              \
     int dx, dy;                                                               \
                                                                               \
     fbptr = (uint##bpp##_t *)                                                 \
-        &cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + x * (bpp/8)]; \
+        &cl->scaledScreen->frameBuffer[y * cl->scaledScreen->paddedWidthInBytes + x * (bpp/8)]; \
                                                                               \
     colorValue = *fbptr;                                                      \
     if (needSameColor && (uint32_t)colorValue != *colorPtr)                   \
@@ -497,7 +497,7 @@ CheckSolidTile##bpp(rfbClientPtr cl, int x, int y, int w, int h,              \
             if (colorValue != fbptr[dx])                                      \
                 return FALSE;                                                 \
         }                                                                     \
-        fbptr = (uint##bpp##_t *)((uint8_t *)fbptr + cl->screen->paddedWidthInBytes); \
+        fbptr = (uint##bpp##_t *)((uint8_t *)fbptr + cl->scaledScreen->paddedWidthInBytes); \
     }                                                                         \
                                                                               \
     *colorPtr = (uint32_t)colorValue;                                         \
@@ -580,12 +580,12 @@ SendSubrect(rfbClientPtr cl,
     if (!SendTightHeader(cl, x, y, w, h))
         return FALSE;
 
-    fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
-             + (x * (cl->screen->bitsPerPixel / 8)));
+    fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
+             + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
     (*cl->translateFn)(cl->translateLookupTable, &cl->screen->serverFormat,
                        &cl->format, fbptr, tightBeforeBuf,
-                       cl->screen->paddedWidthInBytes, w, h);
+                       cl->scaledScreen->paddedWidthInBytes, w, h);
 
     paletteMaxColors = w * h / tightConf[compressLevel].idxMaxColorsDivisor;
     if ( paletteMaxColors < 2 &&
@@ -1723,7 +1723,7 @@ PrepareRowForJpeg24(rfbClientPtr cl,
     uint32_t pix;
 
     fbptr = (uint32_t *)
-        &cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + x * 4];
+        &cl->scaledScreen->frameBuffer[y * cl->scaledScreen->paddedWidthInBytes + x * 4];
 
     while (count--) {
         pix = *fbptr++;
@@ -1742,7 +1742,7 @@ PrepareRowForJpeg##bpp(rfbClientPtr cl, uint8_t *dst, int x, int y, int count) {
     int inRed, inGreen, inBlue;                                             \
                                                                             \
     fbptr = (uint##bpp##_t *)                                               \
-        &cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes +       \
+        &cl->scaledScreen->frameBuffer[y * cl->scaledScreen->paddedWidthInBytes +       \
                              x * (bpp / 8)];                                \
                                                                             \
     while (count--) {                                                       \
diff --git a/libvncserver/ultra.c b/libvncserver/ultra.c
index 5825d5b..e1821bb 100644
--- a/libvncserver/ultra.c
+++ b/libvncserver/ultra.c
@@ -43,8 +43,8 @@ rfbSendOneRectEncodingUltra(rfbClientPtr cl,
     rfbZlibHeader hdr;
     int deflateResult;
     int i;
-    char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
-    	   + (x * (cl->screen->bitsPerPixel / 8)));
+    char *fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
+    	   + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
     int maxRawSize;
     int maxCompSize;
@@ -78,7 +78,7 @@ rfbSendOneRectEncodingUltra(rfbClientPtr cl,
      */
     (*cl->translateFn)(cl->translateLookupTable, &cl->screen->serverFormat,
 		       &cl->format, fbptr, lzoBeforeBuf,
-		       cl->screen->paddedWidthInBytes, w, h);
+		       cl->scaledScreen->paddedWidthInBytes, w, h);
 
     if ( cl->compStreamInitedLZO == FALSE ) {
         cl->compStreamInitedLZO = TRUE;
diff --git a/libvncserver/zlib.c b/libvncserver/zlib.c
index 8503f59..321d86f 100644
--- a/libvncserver/zlib.c
+++ b/libvncserver/zlib.c
@@ -64,13 +64,13 @@ rfbSendOneRectEncodingZlib(rfbClientPtr cl,
     int deflateResult;
     int previousOut;
     int i;
-    char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
-    	   + (x * (cl->screen->bitsPerPixel / 8)));
+    char *fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
+    	   + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
     int maxRawSize;
     int maxCompSize;
 
-    maxRawSize = (cl->screen->width * cl->screen->height
+    maxRawSize = (cl->scaledScreen->width * cl->scaledScreen->height
                   * (cl->format.bitsPerPixel / 8));
 
     if (zlibBeforeBufSize < maxRawSize) {
@@ -84,7 +84,7 @@ rfbSendOneRectEncodingZlib(rfbClientPtr cl,
     /* zlib compression is not useful for very small data sets.
      * So, we just send these raw without any compression.
      */
-    if (( w * h * (cl->screen->bitsPerPixel / 8)) <
+    if (( w * h * (cl->scaledScreen->bitsPerPixel / 8)) <
           VNC_ENCODE_ZLIB_MIN_COMP_SIZE ) {
 
         int result;
@@ -126,7 +126,7 @@ rfbSendOneRectEncodingZlib(rfbClientPtr cl,
      */
     (*cl->translateFn)(cl->translateLookupTable, &cl->screen->serverFormat,
 		       &cl->format, fbptr, zlibBeforeBuf,
-		       cl->screen->paddedWidthInBytes, w, h);
+		       cl->scaledScreen->paddedWidthInBytes, w, h);
 
     cl->compStream.next_in = ( Bytef * )zlibBeforeBuf;
     cl->compStream.avail_in = w * h * (cl->format.bitsPerPixel / 8);
diff --git a/libvncserver/zrle.c b/libvncserver/zrle.c
index da9e67b..76123a0 100644
--- a/libvncserver/zrle.c
+++ b/libvncserver/zrle.c
@@ -30,13 +30,13 @@
 
 
 #define GET_IMAGE_INTO_BUF(tx,ty,tw,th,buf)                                \
-{  char *fbptr = (cl->screen->frameBuffer                                   \
-		 + (cl->screen->paddedWidthInBytes * ty)                   \
-                 + (tx * (cl->screen->bitsPerPixel / 8)));                 \
+{  char *fbptr = (cl->scaledScreen->frameBuffer                                   \
+		 + (cl->scaledScreen->paddedWidthInBytes * ty)                   \
+                 + (tx * (cl->scaledScreen->bitsPerPixel / 8)));                 \
                                                                            \
   (*cl->translateFn)(cl->translateLookupTable, &cl->screen->serverFormat,\
                      &cl->format, fbptr, (char*)buf,                       \
-                     cl->screen->paddedWidthInBytes, tw, th); }
+                     cl->scaledScreen->paddedWidthInBytes, tw, th); }
 
 #define EXTRA_ARGS , rfbClientPtr cl
 
diff --git a/rfb/rfb.h b/rfb/rfb.h
index 06ffa8f..23d64d4 100644
--- a/rfb/rfb.h
+++ b/rfb/rfb.h
@@ -201,6 +201,10 @@ typedef struct _rfbExtensionData {
 
 typedef struct _rfbScreenInfo
 {
+    /* this structure has children that are scaled versions of this screen */
+    struct _rfbScreenInfo *scaledScreenNext;
+    int scaledScreenRefCount;
+
     int width;
     int paddedWidthInBytes;
     int height;
@@ -348,6 +352,12 @@ typedef struct _rfbClientRec {
   
     /* back pointer to the screen */
     rfbScreenInfoPtr screen;
+
+     /* points to a scaled version of the screen buffer in cl->scaledScreenList */
+     rfbScreenInfoPtr scaledScreen;
+     /* how did the client tell us it wanted the screen changed?  Ultra style or palm style? */
+     rfbBool PalmVNC;
+    
   
     /* private data. You should put any application client specific data
      * into a struct and let clientData point to it. Don't forget to