// @(#)root/x11:$Name:  $:$Id: TGX11.cxx,v 1.57 2007/04/19 21:07:02 brun Exp $
// Author: Rene Brun, Olivier Couet, Fons Rademakers   28/11/94

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TGX11                                                                //
//                                                                      //
// This class is the basic interface to the X11 graphics system. It is  //
// an implementation of the abstract TVirtualX class. The companion     //
// class for Win32 is TGWin32.                                          //
//                                                                      //
// This code was initially developed in the context of HIGZ and PAW     //
// by Olivier Couet (package X11INT).                                   //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
#include "TROOT.h"
#include "TColor.h"
#include "TGX11.h"
#include "TPoint.h"
#include "TMath.h"
#include "TStorage.h"
#include "TStyle.h"
#include "TExMap.h"
#include "TEnv.h"
#include "TString.h"
#include "TObjString.h"
#include "TObjArray.h"
#include "RStipples.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#ifdef R__AIX
#   include <sys/socket.h>
#endif

extern float   XRotVersion(char*, int);
extern void    XRotSetMagnification(float);
extern void    XRotSetBoundingBoxPad(int);
extern int     XRotDrawString(Display*, XFontStruct*, float,
                              Drawable, GC, int, int, char*);
extern int     XRotDrawImageString(Display*, XFontStruct*, float,
                                   Drawable, GC, int, int, char*);
extern int     XRotDrawAlignedString(Display*, XFontStruct*, float,
                                     Drawable, GC, int, int, char*, int);
extern int     XRotDrawAlignedImageString(Display*, XFontStruct*, float,
                                          Drawable, GC, int, int, char*, int);
extern XPoint *XRotTextExtents(Display*, XFontStruct*, float,
                               int, int, char*, int);

//---- globals

static XWindow_t *gCws;      // gCws: pointer to the current window
static XWindow_t *gTws;      // gTws: temporary pointer

const Int_t kBIGGEST_RGB_VALUE = 65535;

//
// Primitives Graphic Contexts global for all windows
//
const int kMAXGC = 7;
static GC gGClist[kMAXGC];
static GC *gGCline = &gGClist[0];  // PolyLines
static GC *gGCmark = &gGClist[1];  // PolyMarker
static GC *gGCfill = &gGClist[2];  // Fill areas
static GC *gGCtext = &gGClist[3];  // Text
static GC *gGCinvt = &gGClist[4];  // Inverse text
static GC *gGCdash = &gGClist[5];  // Dashed lines
static GC *gGCpxmp = &gGClist[6];  // Pixmap management

static GC gGCecho;                 // Input echo

static Int_t  gFillHollow;         // Flag if fill style is hollow
static Pixmap gFillPattern = 0;    // Fill pattern

//
// Text management
//
const Int_t kMAXFONT = 4;
static struct {
   XFontStruct *id;
   char         name[80];                    // Font name
} gFont[kMAXFONT];                          // List of fonts loaded

static XFontStruct *gTextFont;              // Current font
static Int_t        gCurrentFontNumber = 0; // Current font number in gFont[]

//
// Markers
//
const Int_t kMAXMK = 100;
static struct {
   int    type;
   int    n;
   XPoint xy[kMAXMK];
} gMarker;                        // Point list to draw marker

//
// Keep style values for line GC
//
static int  gLineWidth = 0;
static int  gLineStyle = LineSolid;
static int  gCapStyle  = CapButt;
static int  gJoinStyle = JoinMiter;
static char gDashList[10];
static int  gDashLength = 0;
static int  gDashOffset = 0;
static int  gDashSize   = 0;

//
// Event masks
//
static ULong_t gMouseMask =   ButtonPressMask   | ButtonReleaseMask |
                              EnterWindowMask   | LeaveWindowMask   |
                              PointerMotionMask | KeyPressMask      |
                              KeyReleaseMask;
static ULong_t gKeybdMask =   ButtonPressMask | KeyPressMask |
                              EnterWindowMask | LeaveWindowMask;

//
// Data to create an invisible cursor
//
const char null_cursor_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
static Cursor gNullCursor = 0;


ClassImp(TGX11)

//______________________________________________________________________________
TGX11::TGX11()
{
   // Default constructor.

   fDisplay      = 0;
   fScreenNumber = 0;
   fVisual       = 0;
   fRootWin      = 0;
   fVisRootWin   = 0;
   fColormap     = 0;
   fBlackPixel   = 0;
   fWhitePixel   = 0;
   fWindows      = 0;
   fColors       = 0;
   fXEvent       = new XEvent;
}

//______________________________________________________________________________
TGX11::TGX11(const char *name, const char *title) : TVirtualX(name, title)
{
   // Normal Constructor.

   fDisplay         = 0;
   fScreenNumber    = 0;
   fVisual          = 0;
   fRootWin         = 0;
   fVisRootWin      = 0;
   fColormap        = 0;
   fBlackPixel      = 0;
   fWhitePixel      = 0;
   fHasTTFonts      = kFALSE;
   fTextAlignH      = 1;
   fTextAlignV      = 1;
   fTextAlign       = 7;
   fTextMagnitude   = 1;
   fCharacterUpX    = 1;
   fCharacterUpY    = 1;
   fDrawMode        = kCopy;
   fXEvent          = new XEvent;

   fMaxNumberOfWindows = 10;
   //fWindows = new XWindow_t[fMaxNumberOfWindows];
   fWindows = (XWindow_t*) TStorage::Alloc(fMaxNumberOfWindows*sizeof(XWindow_t));
   for (int i = 0; i < fMaxNumberOfWindows; i++)
      fWindows[i].fOpen = 0;

   fColors = new TExMap;
}

//______________________________________________________________________________
TGX11::TGX11(const TGX11 &org) : TVirtualX(org)
{
   // Copy constructor. Currently only used by TGX11TTF.

   int i;

   fDisplay         = org.fDisplay;
   fScreenNumber    = org.fScreenNumber;
   fVisual          = org.fVisual;
   fRootWin         = org.fRootWin;
   fVisRootWin      = org.fVisRootWin;
   fColormap        = org.fColormap;
   fBlackPixel      = org.fBlackPixel;
   fWhitePixel      = org.fWhitePixel;
   fHasTTFonts      = org.fHasTTFonts;
   fTextAlignH      = org.fTextAlignH;
   fTextAlignV      = org.fTextAlignV;
   fTextAlign       = org.fTextAlign;
   fTextMagnitude   = org.fTextMagnitude;
   fCharacterUpX    = org.fCharacterUpX;
   fCharacterUpY    = org.fCharacterUpY;
   fDepth           = org.fDepth;
   fRedDiv          = org.fRedDiv;
   fGreenDiv        = org.fGreenDiv;
   fBlueDiv         = org.fBlueDiv;
   fRedShift        = org.fRedShift;
   fGreenShift      = org.fGreenShift;
   fBlueShift       = org.fBlueShift;
   fDrawMode        = org.fDrawMode;
   fXEvent          = new XEvent;

   fMaxNumberOfWindows = org.fMaxNumberOfWindows;
   //fWindows = new XWindow_t[fMaxNumberOfWindows];
   fWindows = (XWindow_t*) TStorage::Alloc(fMaxNumberOfWindows*sizeof(XWindow_t));
   for (i = 0; i < fMaxNumberOfWindows; i++) {
      fWindows[i].fOpen         = org.fWindows[i].fOpen;
      fWindows[i].fDoubleBuffer = org.fWindows[i].fDoubleBuffer;
      fWindows[i].fIsPixmap     = org.fWindows[i].fIsPixmap;
      fWindows[i].fDrawing      = org.fWindows[i].fDrawing;
      fWindows[i].fWindow       = org.fWindows[i].fWindow;
      fWindows[i].fBuffer       = org.fWindows[i].fBuffer;
      fWindows[i].fWidth        = org.fWindows[i].fWidth;
      fWindows[i].fHeight       = org.fWindows[i].fHeight;
      fWindows[i].fClip         = org.fWindows[i].fClip;
      fWindows[i].fXclip        = org.fWindows[i].fXclip;
      fWindows[i].fYclip        = org.fWindows[i].fYclip;
      fWindows[i].fWclip        = org.fWindows[i].fWclip;
      fWindows[i].fHclip        = org.fWindows[i].fHclip;
      fWindows[i].fNewColors    = org.fWindows[i].fNewColors;
      fWindows[i].fNcolors      = org.fWindows[i].fNcolors;
      fWindows[i].fShared       = org.fWindows[i].fShared;
   }

   for (i = 0; i < kNumCursors; i++)
      fCursors[i] = org.fCursors[i];

   fColors = new TExMap;
   Long_t     key, value;
   TExMapIter it(org.fColors);
   while (it.Next(key, value)) {
      XColor_t *colo = (XColor_t *) value;
      XColor_t *col  = new XColor_t;
      col->fPixel   = colo->fPixel;
      col->fRed     = colo->fRed;
      col->fGreen   = colo->fGreen;
      col->fBlue    = colo->fBlue;
      col->fDefined = colo->fDefined;
      fColors->Add(key, (Long_t) col);
   }
}

//______________________________________________________________________________
TGX11::~TGX11()
{
   // Destructor.

   delete fXEvent;
   if (fWindows) TStorage::Dealloc(fWindows);

   if (!fColors) return;
   Long_t     key, value;
   TExMapIter it(fColors);
   while (it.Next(key, value)) {
      XColor_t *col = (XColor_t *) value;
      delete col;
   }
   delete fColors;
}

//______________________________________________________________________________
Bool_t TGX11::Init(void *display)
{
   // Initialize X11 system. Returns kFALSE in case of failure.

   if (OpenDisplay((Display *) display) == -1) return kFALSE;
   return kTRUE;
}

//______________________________________________________________________________
Bool_t TGX11::AllocColor(Colormap cmap, XColor *color)
{
   // Allocate color in colormap. If we are on an <= 8 plane machine
   // we will use XAllocColor. If we are on a >= 15 (15, 16 or 24) plane
   // true color machine we will calculate the pixel value using:
   // for 15 and 16 bit true colors have 6 bits precision per color however
   // only the 5 most significant bits are used in the color index.
   // Except for 16 bits where green uses all 6 bits. I.e.:
   //   15 bits = rrrrrgggggbbbbb
   //   16 bits = rrrrrggggggbbbbb
   // for 24 bits each r, g and b are represented by 8 bits.
   //
   // Since all colors are set with a max of 65535 (16 bits) per r, g, b
   // we just right shift them by 10, 11 and 10 bits for 16 planes, and
   // (10, 10, 10 for 15 planes) and by 8 bits for 24 planes.
   // Returns kFALSE in case color allocation failed.

   if (fRedDiv == -1) {
      if (XAllocColor(fDisplay, cmap, color))
         return kTRUE;
   } else {
      color->pixel = (color->red   >> fRedDiv)   << fRedShift |
                     (color->green >> fGreenDiv) << fGreenShift |
                     (color->blue  >> fBlueDiv)  << fBlueShift;
      return kTRUE;
   }
   return kFALSE;
}

//______________________________________________________________________________
void TGX11::QueryColors(Colormap cmap, XColor *color, Int_t ncolors)
{
   // Returns the current RGB value for the pixel in the XColor structure.

   if (fRedDiv == -1) {
      XQueryColors(fDisplay, cmap, color, ncolors);
   } else {
      ULong_t r, g, b;
      for (Int_t i = 0; i < ncolors; i++) {
         r = (color[i].pixel & fVisual->red_mask) >> fRedShift;
         color[i].red = UShort_t(r*kBIGGEST_RGB_VALUE/(fVisual->red_mask >> fRedShift));

         g = (color[i].pixel & fVisual->green_mask) >> fGreenShift;
         color[i].green = UShort_t(g*kBIGGEST_RGB_VALUE/(fVisual->green_mask >> fGreenShift));

         b = (color[i].pixel & fVisual->blue_mask) >> fBlueShift;
         color[i].blue = UShort_t(b*kBIGGEST_RGB_VALUE/(fVisual->blue_mask >> fBlueShift));

         color[i].flags = DoRed | DoGreen | DoBlue;
      }
   }
}

//______________________________________________________________________________
void TGX11::ClearPixmap(Drawable *pix)
{
   // Clear the pixmap pix.

   Window root;
   int xx, yy;
   unsigned int ww, hh, border, depth;
   XGetGeometry(fDisplay, *pix, &root, &xx, &yy, &ww, &hh, &border, &depth);
   SetColor(*gGCpxmp, 0);
   XFillRectangle(fDisplay, *pix, *gGCpxmp, 0 ,0 ,ww ,hh);
   SetColor(*gGCpxmp, 1);
   XFlush(fDisplay);
}

//______________________________________________________________________________
void TGX11::ClearWindow()
{
   // Clear current window.

   if (!gCws->fIsPixmap && !gCws->fDoubleBuffer) {
      XSetWindowBackground(fDisplay, gCws->fDrawing, GetColor(0).fPixel);
      XClearWindow(fDisplay, gCws->fDrawing);
      XFlush(fDisplay);
   } else {
      SetColor(*gGCpxmp, 0);
      XFillRectangle(fDisplay, gCws->fDrawing, *gGCpxmp,
                     0, 0, gCws->fWidth, gCws->fHeight);
      SetColor(*gGCpxmp, 1);
   }
}

//______________________________________________________________________________
void TGX11::ClosePixmap()
{
   // Delete current pixmap.

   CloseWindow1();
}

//______________________________________________________________________________
void TGX11::CloseWindow()
{
   // Delete current window.

   if (gCws->fShared)
      gCws->fOpen = 0;
   else
      CloseWindow1();

   // Never close connection. TApplication takes care of that
   //   if (!gCws) Close();    // close X when no open window left
}

//______________________________________________________________________________
void TGX11::CloseWindow1()
{
   // Delete current window.

   int wid;

   if (gCws->fIsPixmap)
      XFreePixmap(fDisplay, gCws->fWindow);
   else
      XDestroyWindow(fDisplay, gCws->fWindow);

   if (gCws->fBuffer) XFreePixmap(fDisplay, gCws->fBuffer);

   if (gCws->fNewColors) {
      if (fRedDiv == -1)
         XFreeColors(fDisplay, fColormap, gCws->fNewColors, gCws->fNcolors, 0);
      delete [] gCws->fNewColors;
      gCws->fNewColors = 0;
   }

   XFlush(fDisplay);

   gCws->fOpen = 0;

   // make first window in list the current window
   for (wid = 0; wid < fMaxNumberOfWindows; wid++)
      if (fWindows[wid].fOpen) {
         gCws = &fWindows[wid];
         return;
      }

   gCws = 0;
}

//______________________________________________________________________________
void TGX11::CopyPixmap(int wid, int xpos, int ypos)
{
   // Copy the pixmap wid at the position xpos, ypos in the current window.

   gTws = &fWindows[wid];

   XCopyArea(fDisplay, gTws->fDrawing, gCws->fDrawing, *gGCpxmp, 0, 0, gTws->fWidth,
             gTws->fHeight, xpos, ypos);
   XFlush(fDisplay);
}

//______________________________________________________________________________
void TGX11::CopyWindowtoPixmap(Drawable *pix, int xpos, int ypos )
{
   // Copy area of current window in the pixmap pix.

   Window root;
   int xx, yy;
   unsigned int ww, hh, border, depth;

   XGetGeometry(fDisplay, *pix, &root, &xx, &yy, &ww, &hh, &border, &depth);
   XCopyArea(fDisplay, gCws->fDrawing, *pix, *gGCpxmp, xpos, ypos, ww, hh, 0, 0);
   XFlush(fDisplay);
}

//______________________________________________________________________________
void TGX11::DrawBox(int x1, int y1, int x2, int y2, EBoxMode mode)
{
   // Draw a box.
   // mode=0 hollow  (kHollow)
   // mode=1 solid   (kSolid)

   Int_t x = TMath::Min(x1, x2);
   Int_t y = TMath::Min(y1, y2);
   Int_t w = TMath::Abs(x2 - x1);
   Int_t h = TMath::Abs(y2 - y1);

   switch (mode) {

      case kHollow:
         XDrawRectangle(fDisplay, gCws->fDrawing, *gGCline, x, y, w, h);
         break;

      case kFilled:
         XFillRectangle(fDisplay, gCws->fDrawing, *gGCfill, x, y, w, h);
         break;

      default:
         break;
   }
}

//______________________________________________________________________________
void TGX11::DrawCellArray(int x1, int y1, int x2, int y2, int nx, int ny, int *ic)
{
   // Draw a cell array.
   // x1,y1        : left down corner
   // x2,y2        : right up corner
   // nx,ny        : array size
   // ic           : array
   //
   // Draw a cell array. The drawing is done with the pixel presicion
   // if (X2-X1)/NX (or Y) is not a exact pixel number the position of
   // the top rigth corner may be wrong.

   int i, j, icol, ix, iy, w, h, current_icol;

   current_icol = -1;
   w            = TMath::Max((x2-x1)/(nx),1);
   h            = TMath::Max((y1-y2)/(ny),1);
   ix           = x1;

   for (i = 0; i < nx; i++) {
      iy = y1-h;
      for (j = 0; j < ny; j++) {
         icol = ic[i+(nx*j)];
         if (icol != current_icol) {
            XSetForeground(fDisplay, *gGCfill, GetColor(icol).fPixel);
            current_icol = icol;
         }
         XFillRectangle(fDisplay, gCws->fDrawing, *gGCfill, ix, iy, w, h);
         iy = iy-h;
      }
      ix = ix+w;
   }
}

//______________________________________________________________________________
void TGX11::DrawFillArea(int n, TPoint *xyt)
{
   // Fill area described by polygon.
   // n         : number of points
   // xy(2,n)   : list of points

   XPoint *xy = (XPoint*)xyt;

   if (gFillHollow)
      XDrawLines(fDisplay, gCws->fDrawing, *gGCfill, xy, n, CoordModeOrigin);

   else {
      XFillPolygon(fDisplay, gCws->fDrawing, *gGCfill,
                   xy, n, Nonconvex, CoordModeOrigin);
   }
}

//______________________________________________________________________________
void TGX11::DrawLine(int x1, int y1, int x2, int y2)
{
   // Draw a line.
   // x1,y1        : begin of line
   // x2,y2        : end of line

   if (gLineStyle == LineSolid)
      XDrawLine(fDisplay, gCws->fDrawing, *gGCline, x1, y1, x2, y2);
   else {
      XSetDashes(fDisplay, *gGCdash, gDashOffset, gDashList, gDashSize);
      XDrawLine(fDisplay, gCws->fDrawing, *gGCdash, x1, y1, x2, y2);
   }
}

//______________________________________________________________________________
void TGX11::DrawPolyLine(int n, TPoint *xyt)
{
   // Draw a line through all points.
   // n         : number of points
   // xy        : list of points

   XPoint *xy = (XPoint*)xyt;

   const Int_t kMaxPoints = 1000001;

   if (n > kMaxPoints) {
      int ibeg = 0;
      int iend = kMaxPoints - 1;
      while (iend < n) {
         DrawPolyLine( kMaxPoints, &xyt[ibeg] );
         ibeg = iend;
         iend += kMaxPoints - 1;
      }
      if (ibeg < n) {
         int npt = n - ibeg;
         DrawPolyLine( npt, &xyt[ibeg] );
      }
   } else if (n > 1) {
      if (gLineStyle == LineSolid)
         XDrawLines(fDisplay, gCws->fDrawing, *gGCline, xy, n, CoordModeOrigin);
      else {
         int i;
         XSetDashes(fDisplay, *gGCdash,
                    gDashOffset, gDashList, gDashSize);
         XDrawLines(fDisplay, gCws->fDrawing, *gGCdash, xy, n, CoordModeOrigin);

         // calculate length of line to update dash offset
         for (i = 1; i < n; i++) {
            int dx = xy[i].x - xy[i-1].x;
            int dy = xy[i].y - xy[i-1].y;
            if (dx < 0) dx = - dx;
            if (dy < 0) dy = - dy;
            gDashOffset += dx > dy ? dx : dy;
         }
         gDashOffset %= gDashLength;
      }
   } else {
      int px,py;
      px=xy[0].x;
      py=xy[0].y;
      XDrawPoint(fDisplay, gCws->fDrawing,
                 gLineStyle == LineSolid ? *gGCline : *gGCdash, px, py);
   }
}

//______________________________________________________________________________
void TGX11::DrawPolyMarker(int n, TPoint *xyt)
{
   // Draw n markers with the current attributes at position x, y.
   // n    : number of markers to draw
   // xy   : x,y coordinates of markers

   XPoint *xy = (XPoint*)xyt;

   if (gMarker.n <= 0) {
      const int kNMAX = 1000000;
      int nt = n/kNMAX;
      for (int it=0;it<=nt;it++) {
         if (it < nt) {
            XDrawPoints(fDisplay, gCws->fDrawing, *gGCmark, &xy[it*kNMAX], kNMAX, CoordModeOrigin);
         } else {
            XDrawPoints(fDisplay, gCws->fDrawing, *gGCmark, &xy[it*kNMAX], n-it*kNMAX, CoordModeOrigin);
         }
      }
   } else {
      int r = gMarker.n / 2;
      int m;

      for (m = 0; m < n; m++) {
         int hollow = 0;

         switch (gMarker.type) {
            int i;

            case 0:        // hollow circle
               XDrawArc(fDisplay, gCws->fDrawing, *gGCmark,
                        xy[m].x - r, xy[m].y - r, gMarker.n, gMarker.n, 0, 360*64);
               break;

            case 1:        // filled circle
               XFillArc(fDisplay, gCws->fDrawing, *gGCmark,
                        xy[m].x - r, xy[m].y - r, gMarker.n, gMarker.n, 0, 360*64);
               break;

            case 2:        // hollow polygon
               hollow = 1;
            case 3:        // filled polygon
               for (i = 0; i < gMarker.n; i++) {
                  gMarker.xy[i].x += xy[m].x;
                  gMarker.xy[i].y += xy[m].y;
               }
               if (hollow)
                  XDrawLines(fDisplay, gCws->fDrawing, *gGCmark,
                             gMarker.xy, gMarker.n, CoordModeOrigin);
               else
                  XFillPolygon(fDisplay, gCws->fDrawing, *gGCmark,
                               gMarker.xy, gMarker.n, Nonconvex, CoordModeOrigin);
               for (i = 0; i < gMarker.n; i++) {
                  gMarker.xy[i].x -= xy[m].x;
                  gMarker.xy[i].y -= xy[m].y;
               }
               break;

            case 4:        // segmented line
               for (i = 0; i < gMarker.n; i += 2)
                  XDrawLine(fDisplay, gCws->fDrawing, *gGCmark,
                            xy[m].x + gMarker.xy[i].x, xy[m].y + gMarker.xy[i].y,
                            xy[m].x + gMarker.xy[i+1].x, xy[m].y + gMarker.xy[i+1].y);
               break;
         }
      }
   }
}

//______________________________________________________________________________
void TGX11::DrawText(int x, int y, float angle, float mgn,
                     const char *text, ETextMode mode)
{
   // Draw a text string using current font.
   // mode       : drawing mode
   // mode=0     : the background is not drawn (kClear)
   // mode=1     : the background is drawn (kOpaque)
   // x,y        : text position
   // angle      : text angle
   // mgn        : magnification factor
   // text       : text string

   XRotSetMagnification(mgn);

   if (!text) return;

   switch (mode) {

      case kClear:
         XRotDrawAlignedString(fDisplay, gTextFont, angle,
                      gCws->fDrawing, *gGCtext, x, y, (char*)text, fTextAlign);
         break;

      case kOpaque:
         XRotDrawAlignedImageString(fDisplay, gTextFont, angle,
                      gCws->fDrawing, *gGCtext, x, y, (char*)text, fTextAlign);
         break;

      default:
         break;
   }
}

//______________________________________________________________________________
void TGX11::FindBestVisual()
{
   // Find best visual, i.e. the one with the most planes and TrueColor or
   // DirectColor. Sets fVisual, fDepth, fRootWin, fColormap, fBlackPixel
   // and fWhitePixel.

   Int_t findvis = gEnv->GetValue("X11.FindBestVisual", 1);

   Visual *vis = DefaultVisual(fDisplay, fScreenNumber);
   if (((vis->c_class != TrueColor && vis->c_class != DirectColor) ||
       DefaultDepth(fDisplay, fScreenNumber) < 15) && findvis) {

      // try to find better visual
      static XVisualInfo templates[] = {
         // Visual, visualid, screen, depth, class      , red_mask, green_mask, blue_mask, colormap_size, bits_per_rgb
         { 0     , 0       , 0     , 24   , TrueColor  , 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 32   , TrueColor  , 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 16   , TrueColor  , 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 15   , TrueColor  , 0       , 0         , 0        , 0            , 0 },
         // no suitable TrueColorMode found - now do the same thing to DirectColor
         { 0     , 0       , 0     , 24   , DirectColor, 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 32   , DirectColor, 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 16   , DirectColor, 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 15   , DirectColor, 0       , 0         , 0        , 0            , 0 },
         { 0     , 0       , 0     , 0    , 0          , 0       , 0         , 0        , 0            , 0 },
      };

      Int_t nitems = 0;
      XVisualInfo *vlist = 0;
      for (Int_t i = 0; templates[i].depth != 0; i++) {
         Int_t mask = VisualScreenMask|VisualDepthMask|VisualClassMask;
         templates[i].screen = fScreenNumber;
         if ((vlist = XGetVisualInfo(fDisplay, mask, &(templates[i]), &nitems))) {
            FindUsableVisual(vlist, nitems);
            XFree(vlist);
            vlist = 0;
            if (fVisual)
               break;
         }
      }
   }

   fRootWin = RootWindow(fDisplay, fScreenNumber);

   if (!fVisual) {
      fDepth      = DefaultDepth(fDisplay, fScreenNumber);
      fVisual     = DefaultVisual(fDisplay, fScreenNumber);
      fVisRootWin = fRootWin;
      if (fDepth > 1)
         fColormap = DefaultColormap(fDisplay, fScreenNumber);
      fBlackPixel = BlackPixel(fDisplay, fScreenNumber);
      fWhitePixel = WhitePixel(fDisplay, fScreenNumber);
   }
   if (gDebug > 1)
      Printf("Selected visual 0x%lx: depth %d, class %d, colormap: %s",
             fVisual->visualid, fDepth, fVisual->c_class,
             fColormap == DefaultColormap(fDisplay, fScreenNumber) ? "default" :
             "custom");
}

//______________________________________________________________________________
static Int_t DummyX11ErrorHandler(Display *, XErrorEvent *)
{
   // Dummy error handler for X11. Used by FindUsableVisual().

   return 0;
}

//______________________________________________________________________________
void TGX11::FindUsableVisual(XVisualInfo *vlist, Int_t nitems)
{
   // Check if visual is usable, if so set fVisual, fDepth, fColormap,
   // fBlackPixel and fWhitePixel.

   Int_t (*oldErrorHandler)(Display *, XErrorEvent *) =
       XSetErrorHandler(DummyX11ErrorHandler);

   XSetWindowAttributes attr;
   memset(&attr, 0, sizeof(attr));

   Window root = RootWindow(fDisplay, fScreenNumber);

   for (Int_t i = 0; i < nitems; i++) {
      Window w = None, wjunk;
      UInt_t width, height, ujunk;
      Int_t  junk;

      // try and use default colormap when possible
      if (vlist[i].visual == DefaultVisual(fDisplay, fScreenNumber)) {
         attr.colormap = DefaultColormap(fDisplay, fScreenNumber);
      } else {
         attr.colormap = XCreateColormap(fDisplay, root, vlist[i].visual, AllocNone);
      }

      static XColor black_xcol = { 0, 0x0000, 0x0000, 0x0000, DoRed|DoGreen|DoBlue, 0 };
      static XColor white_xcol = { 0, 0xFFFF, 0xFFFF, 0xFFFF, DoRed|DoGreen|DoBlue, 0 };
      XAllocColor(fDisplay, attr.colormap, &black_xcol);
      XAllocColor(fDisplay, attr.colormap, &white_xcol);
      attr.border_pixel = black_xcol.pixel;
      attr.override_redirect = True;

      w = XCreateWindow(fDisplay, root, -20, -20, 10, 10, 0, vlist[i].depth,
                        CopyFromParent, vlist[i].visual,
                        CWColormap|CWBorderPixel|CWOverrideRedirect, &attr);
      if (w != None && XGetGeometry(fDisplay, w, &wjunk, &junk, &junk,
                                    &width, &height, &ujunk, &ujunk)) {
         fVisual     = vlist[i].visual;
         fDepth      = vlist[i].depth;
         fColormap   = attr.colormap;
         fBlackPixel = black_xcol.pixel;
         fWhitePixel = white_xcol.pixel;
         fVisRootWin = w;
         break;
      }
      if (attr.colormap != DefaultColormap(fDisplay, fScreenNumber))
         XFreeColormap(fDisplay, attr.colormap);
   }
   XSetErrorHandler(oldErrorHandler);
}

//______________________________________________________________________________
void TGX11::GetCharacterUp(Float_t &chupx, Float_t &chupy)
{
   // Return character up vector.

   chupx = fCharacterUpX;
   chupy = fCharacterUpY;
}

//______________________________________________________________________________
XColor_t &TGX11::GetColor(Int_t cid)
{
   // Return reference to internal color structure associated
   // to color index cid.

   XColor_t *col = (XColor_t*) fColors->GetValue(cid);
   if (!col) {
      col = new XColor_t;
      fColors->Add(cid, (Long_t) col);
   }
   return *col;
}

//______________________________________________________________________________
Window_t TGX11::GetCurrentWindow() const
{
   // Return current window pointer. Protected method used by TGX11TTF.

   return (Window_t)(gCws ? gCws->fDrawing : 0);
}

//______________________________________________________________________________
GC *TGX11::GetGC(Int_t which) const
{
   // Return desired Graphics Context ("which" maps directly on gGCList[]).
   // Protected method used by TGX11TTF.

   if (which >= kMAXGC || which < 0) {
      Error("GetGC", "trying to get illegal GC (which = %d)", which);
      return 0;
   }
   return &gGClist[which];
}

//______________________________________________________________________________
Int_t TGX11::GetDoubleBuffer(int wid)
{
   // Query the double buffer value for the window wid.

   gTws = &fWindows[wid];
   if (!gTws->fOpen)
      return -1;
   else
      return gTws->fDoubleBuffer;
}

//______________________________________________________________________________
void TGX11::GetGeometry(int wid, int &x, int &y, unsigned int &w, unsigned int &h)
{
   // Return position and size of window wid.
   // wid        : window identifier
   // x,y        : window position (output)
   // w,h        : window size (output)
   // if wid < 0 the size of the display is returned

   Window junkwin=0;

   if (wid < 0) {
      x = 0;
      y = 0;
      w = DisplayWidth(fDisplay,fScreenNumber);
      h = DisplayHeight(fDisplay,fScreenNumber);
   } else {
      Window root;
      unsigned int border, depth;
      unsigned int width, height;

      gTws = &fWindows[wid];
      XGetGeometry(fDisplay, gTws->fWindow, &root, &x, &y,
                   &width, &height, &border, &depth);
      XTranslateCoordinates(fDisplay, gTws->fWindow, fRootWin,
                            0, 0, &x, &y, &junkwin);
      if (width >= 65535)
         width = 1;
      if (height >= 65535)
         height = 1;
      if (width > 0 && height > 0) {
         gTws->fWidth  = width;
         gTws->fHeight = height;
      }
      w = gTws->fWidth;
      h = gTws->fHeight;
   }
}

//______________________________________________________________________________
const char *TGX11::DisplayName(const char *dpyName)
{
   // Return hostname on which the display is opened.

   return XDisplayName(dpyName);
}

//______________________________________________________________________________
ULong_t TGX11::GetPixel(Color_t ci)
{
   // Return pixel value associated to specified ROOT color number.

   TColor *color = gROOT->GetColor(ci);
   if (color)
      SetRGB(ci, color->GetRed(), color->GetGreen(), color->GetBlue());
//   else
//      Warning("GetPixel", "color with index %d not defined", ci);

   XColor_t &col = GetColor(ci);
   return col.fPixel;
}

//______________________________________________________________________________
void TGX11::GetPlanes(int &nplanes)
{
   // Get maximum number of planes.

   nplanes = fDepth;
}

//______________________________________________________________________________
void TGX11::GetRGB(int index, float &r, float &g, float &b)
{
   // Get rgb values for color "index".

   if (index == 0) {
      r = g = b = 1.0;
   } else if (index == 1) {
      r = g = b = 0.0;
   } else {
      XColor_t &col = GetColor(index);
      r = ((float) col.fRed) / ((float) kBIGGEST_RGB_VALUE);
      g = ((float) col.fGreen) / ((float) kBIGGEST_RGB_VALUE);
      b = ((float) col.fBlue) / ((float) kBIGGEST_RGB_VALUE);
   }
}

//______________________________________________________________________________
void TGX11::GetTextExtent(unsigned int &w, unsigned int &h, char *mess)
{
   // Return the size of a character string.
   // iw          : text width
   // ih          : text height
   // mess        : message

   w=0; h=0;
   if (strlen(mess)==0) return;

   XPoint *cBox;
   XRotSetMagnification(fTextMagnitude);
   cBox = XRotTextExtents(fDisplay, gTextFont, 0., 0, 0, mess, 0);
   w    = cBox[2].x;
   h    = -cBox[2].y;
   free((char *)cBox);
}

//______________________________________________________________________________
Window_t TGX11::GetWindowID(int wid)
{
   // Return the X11 window identifier.
   // wid      : Workstation identifier (input)

   return (Window_t) fWindows[wid].fWindow;
}

//______________________________________________________________________________
void TGX11::MoveWindow(int wid, int x, int y)
{
   // Move the window wid.
   // wid  : Window identifier.
   // x    : x new window position
   // y    : y new window position

   gTws = &fWindows[wid];
   if (!gTws->fOpen) return;

   XMoveWindow(fDisplay, gTws->fWindow, x, y);
}

//______________________________________________________________________________
Int_t TGX11::OpenDisplay(Display *disp)
{
   // Open the display. Return -1 if the opening fails, 0 when ok.

   Pixmap  pixmp1, pixmp2;
   XColor  fore, back;
   char  **fontlist;
   int     fontcount = 0;
   int     i;

   if (fDisplay) return 0;

   fDisplay      = disp;
   fScreenNumber = DefaultScreen(fDisplay);

   FindBestVisual();

   GetColor(1).fDefined = kTRUE; // default foreground
   GetColor(1).fPixel = fBlackPixel;
   GetColor(0).fDefined = kTRUE; // default background
   GetColor(0).fPixel = fWhitePixel;

   // Inquire the the XServer Vendor
   char vendor[132];
   strcpy(vendor, XServerVendor(fDisplay));

   // Create primitives graphic contexts
   for (i = 0; i < kMAXGC; i++)
      gGClist[i] = XCreateGC(fDisplay, fVisRootWin, 0, 0);

   XGCValues values;
   if (XGetGCValues(fDisplay, *gGCtext, GCForeground|GCBackground, &values)) {
      XSetForeground(fDisplay, *gGCinvt, values.background);
      XSetBackground(fDisplay, *gGCinvt, values.foreground);
   } else {
      Error("OpenDisplay", "cannot get GC values");
   }

   // Turn-off GraphicsExpose and NoExpose event reporting for the pixmap
   // manipulation GC, this to prevent these events from being stacked up
   // without ever being processed and thereby wasting a lot of memory.
   XSetGraphicsExposures(fDisplay, *gGCpxmp, False);

   // Create input echo graphic context
   XGCValues echov;
   echov.foreground = fBlackPixel;
   echov.background = fWhitePixel;
   if (strstr(vendor,"Hewlett"))
      echov.function   = GXxor;
   else
      echov.function   = GXinvert;

   gGCecho = XCreateGC(fDisplay, fVisRootWin,
                       GCForeground | GCBackground | GCFunction,
                       &echov);

   // Load a default Font
   static int isdisp = 0;
   if (!isdisp) {
      for (i = 0; i < kMAXFONT; i++) {
         gFont[i].id = 0;
         strcpy(gFont[i].name, " ");
      }
      fontlist = XListFonts(fDisplay, "*courier*", 1, &fontcount);
      if (fontcount != 0) {
         gFont[gCurrentFontNumber].id = XLoadQueryFont(fDisplay, fontlist[0]);
         gTextFont = gFont[gCurrentFontNumber].id;
         strcpy(gFont[gCurrentFontNumber].name, "*courier*");
         gCurrentFontNumber++;
         XFreeFontNames(fontlist);
      } else {
         // emergency: try fixed font
         fontlist = XListFonts(fDisplay, "fixed", 1, &fontcount);
         if (fontcount != 0) {
            gFont[gCurrentFontNumber].id = XLoadQueryFont(fDisplay, fontlist[0]);
            gTextFont = gFont[gCurrentFontNumber].id;
            strcpy(gFont[gCurrentFontNumber].name, "fixed");
            gCurrentFontNumber++;
            XFreeFontNames(fontlist);
         } else {
            Warning("OpenDisplay", "no default font loaded");
         }
      }
      isdisp = 1;
   }

   // Create a null cursor
   pixmp1 = XCreateBitmapFromData(fDisplay, fRootWin,
                                  null_cursor_bits, 16, 16);
   pixmp2 = XCreateBitmapFromData(fDisplay, fRootWin,
                                  null_cursor_bits, 16, 16);
   gNullCursor = XCreatePixmapCursor(fDisplay,pixmp1,pixmp2,&fore,&back,0,0);

   // Create cursors
   fCursors[kBottomLeft]  = XCreateFontCursor(fDisplay, XC_bottom_left_corner);
   fCursors[kBottomRight] = XCreateFontCursor(fDisplay, XC_bottom_right_corner);
   fCursors[kTopLeft]     = XCreateFontCursor(fDisplay, XC_top_left_corner);
   fCursors[kTopRight]    = XCreateFontCursor(fDisplay, XC_top_right_corner);
   fCursors[kBottomSide]  = XCreateFontCursor(fDisplay, XC_bottom_side);
   fCursors[kLeftSide]    = XCreateFontCursor(fDisplay, XC_left_side);
   fCursors[kTopSide]     = XCreateFontCursor(fDisplay, XC_top_side);
   fCursors[kRightSide]   = XCreateFontCursor(fDisplay, XC_right_side);
   fCursors[kMove]        = XCreateFontCursor(fDisplay, XC_fleur);
   fCursors[kCross]       = XCreateFontCursor(fDisplay, XC_tcross);
   fCursors[kArrowHor]    = XCreateFontCursor(fDisplay, XC_sb_h_double_arrow);
   fCursors[kArrowVer]    = XCreateFontCursor(fDisplay, XC_sb_v_double_arrow);
   fCursors[kHand]        = XCreateFontCursor(fDisplay, XC_hand2);
   fCursors[kRotate]      = XCreateFontCursor(fDisplay, XC_exchange);
   fCursors[kPointer]     = XCreateFontCursor(fDisplay, XC_left_ptr);
   fCursors[kArrowRight]  = XCreateFontCursor(fDisplay, XC_arrow);
   fCursors[kCaret]       = XCreateFontCursor(fDisplay, XC_xterm);
   fCursors[kWatch]       = XCreateFontCursor(fDisplay, XC_watch);
   fCursors[kNoDrop]      = XCreateFontCursor(fDisplay, XC_pirate);

   // Setup color information
   fRedDiv = fGreenDiv = fBlueDiv = fRedShift = fGreenShift = fBlueShift = -1;

   if (fVisual->c_class == TrueColor) {
      int i;
      for (i = 0; i < int(sizeof(fVisual->blue_mask)*kBitsPerByte); i++) {
         if (fBlueShift == -1 && ((fVisual->blue_mask >> i) & 1))
            fBlueShift = i;
         if ((fVisual->blue_mask >> i) == 1) {
            fBlueDiv = sizeof(UShort_t)*kBitsPerByte - i - 1 + fBlueShift;
            break;
         }
      }
      for (i = 0; i < int(sizeof(fVisual->green_mask)*kBitsPerByte); i++) {
         if (fGreenShift == -1 && ((fVisual->green_mask >> i) & 1))
            fGreenShift = i;
         if ((fVisual->green_mask >> i) == 1) {
            fGreenDiv = sizeof(UShort_t)*kBitsPerByte - i - 1 + fGreenShift;
            break;
         }
      }
      for (i = 0; i < int(sizeof(fVisual->red_mask)*kBitsPerByte); i++) {
         if (fRedShift == -1 && ((fVisual->red_mask >> i) & 1))
            fRedShift = i;
         if ((fVisual->red_mask >> i) == 1) {
            fRedDiv = sizeof(UShort_t)*kBitsPerByte - i - 1 + fRedShift;
            break;
         }
      }
      //printf("fRedDiv = %d, fGreenDiv = %d, fBlueDiv = %d, fRedShift = %d, fGreenShift = %d, fBlueShift = %d\n",
      //       fRedDiv, fGreenDiv, fBlueDiv, fRedShift, fGreenShift, fBlueShift);
   }

   return 0;
}

//______________________________________________________________________________
Int_t TGX11::OpenPixmap(unsigned int w, unsigned int h)
{
   // Open a new pixmap.
   // w,h : Width and height of the pixmap.

   Window root;
   unsigned int wval, hval;
   int xx, yy, i, wid;
   unsigned int ww, hh, border, depth;
   wval = w;
   hval = h;

   // Select next free window number

again:
   for (wid = 0; wid < fMaxNumberOfWindows; wid++)
      if (!fWindows[wid].fOpen) {
         fWindows[wid].fOpen = 1;
         gCws = &fWindows[wid];
         break;
      }

   if (wid == fMaxNumberOfWindows) {
      int newsize = fMaxNumberOfWindows + 10;
      fWindows = (XWindow_t*) TStorage::ReAlloc(fWindows, newsize*sizeof(XWindow_t),
                                                fMaxNumberOfWindows*sizeof(XWindow_t));
      for (i = fMaxNumberOfWindows; i < newsize; i++)
         fWindows[i].fOpen = 0;
      fMaxNumberOfWindows = newsize;
      goto again;
   }

   gCws->fWindow = XCreatePixmap(fDisplay, fRootWin, wval, hval, fDepth);
   XGetGeometry(fDisplay, gCws->fWindow, &root, &xx, &yy, &ww, &hh, &border, &depth);

   for (i = 0; i < kMAXGC; i++)
      XSetClipMask(fDisplay, gGClist[i], None);

   SetColor(*gGCpxmp, 0);
   XFillRectangle(fDisplay, gCws->fWindow, *gGCpxmp, 0, 0, ww, hh);
   SetColor(*gGCpxmp, 1);

   // Initialise the window structure
   gCws->fDrawing       = gCws->fWindow;
   gCws->fBuffer        = 0;
   gCws->fDoubleBuffer  = 0;
   gCws->fIsPixmap      = 1;
   gCws->fClip          = 0;
   gCws->fWidth         = wval;
   gCws->fHeight        = hval;
   gCws->fNewColors     = 0;
   gCws->fShared        = kFALSE;

   return wid;
}

//______________________________________________________________________________
Int_t TGX11::InitWindow(ULong_t win)
{
   // Open window and return window number.
   // Return -1 if window initialization fails.

   XSetWindowAttributes attributes;
   ULong_t attr_mask = 0;
   int wid;
   int xval, yval;
   unsigned int wval, hval, border, depth;
   Window root;

   Window wind = (Window) win;

   XGetGeometry(fDisplay, wind, &root, &xval, &yval, &wval, &hval, &border, &depth);

   // Select next free window number

again:
   for (wid = 0; wid < fMaxNumberOfWindows; wid++)
      if (!fWindows[wid].fOpen) {
         fWindows[wid].fOpen = 1;
         fWindows[wid].fDoubleBuffer = 0;
         gCws = &fWindows[wid];
         break;
      }

   if (wid == fMaxNumberOfWindows) {
      int newsize = fMaxNumberOfWindows + 10;
      fWindows = (XWindow_t*) TStorage::ReAlloc(fWindows, newsize*sizeof(XWindow_t),
                                                fMaxNumberOfWindows*sizeof(XWindow_t));
      for (int i = fMaxNumberOfWindows; i < newsize; i++)
         fWindows[i].fOpen = 0;
      fMaxNumberOfWindows = newsize;
      goto again;
   }

   // Create window

   attributes.background_pixel = GetColor(0).fPixel;
   attr_mask |= CWBackPixel;
   attributes.border_pixel = GetColor(1).fPixel;
   attr_mask |= CWBorderPixel;
   attributes.event_mask = NoEventMask;
   attr_mask |= CWEventMask;
   attributes.backing_store = Always;
   attr_mask |= CWBackingStore;
   attributes.bit_gravity = NorthWestGravity;
   attr_mask |= CWBitGravity;
   if (fColormap) {
      attributes.colormap = fColormap;
      attr_mask |= CWColormap;
   }

   gCws->fWindow = XCreateWindow(fDisplay, wind,
                                 xval, yval, wval, hval, 0, fDepth,
                                 InputOutput, fVisual,
                                 attr_mask, &attributes);

   XMapWindow(fDisplay, gCws->fWindow);
   XFlush(fDisplay);

   // Initialise the window structure

   gCws->fDrawing      = gCws->fWindow;
   gCws->fBuffer       = 0;
   gCws->fDoubleBuffer = 0;
   gCws->fIsPixmap     = 0;
   gCws->fClip         = 0;
   gCws->fWidth        = wval;
   gCws->fHeight       = hval;
   gCws->fNewColors    = 0;
   gCws->fShared       = kFALSE;

   return wid;
}

//______________________________________________________________________________
Int_t TGX11::AddWindow(ULong_t qwid, UInt_t w, UInt_t h)
{
   // Register a window created by Qt as a ROOT window (like InitWindow()).

   Int_t wid;

   // Select next free window number

again:
   for (wid = 0; wid < fMaxNumberOfWindows; wid++)
      if (!fWindows[wid].fOpen) {
         fWindows[wid].fOpen = 1;
         fWindows[wid].fDoubleBuffer = 0;
         gCws = &fWindows[wid];
         break;
      }

   if (wid == fMaxNumberOfWindows) {
      int newsize = fMaxNumberOfWindows + 10;
      fWindows = (XWindow_t*) TStorage::ReAlloc(fWindows, newsize*sizeof(XWindow_t),
                                                fMaxNumberOfWindows*sizeof(XWindow_t));
      for (int i = fMaxNumberOfWindows; i < newsize; i++)
         fWindows[i].fOpen = 0;
      fMaxNumberOfWindows = newsize;
      goto again;
   }

   gCws->fWindow = qwid;

   //init Xwindow_t struct
   gCws->fDrawing       = gCws->fWindow;
   gCws->fBuffer        = 0;
   gCws->fDoubleBuffer  = 0;
   gCws->fIsPixmap      = 0;
   gCws->fClip          = 0;
   gCws->fWidth         = w;
   gCws->fHeight        = h;
   gCws->fNewColors     = 0;
   gCws->fShared        = kTRUE;

   return wid;
}

//______________________________________________________________________________
void TGX11::RemoveWindow(ULong_t qwid)
{
   // Remove a window created by Qt (like CloseWindow1()).

   SelectWindow((int)qwid);

   if (gCws->fBuffer) XFreePixmap(fDisplay, gCws->fBuffer);

   if (gCws->fNewColors) {
      if (fRedDiv == -1)
         XFreeColors(fDisplay, fColormap, gCws->fNewColors, gCws->fNcolors, 0);
      delete [] gCws->fNewColors;
      gCws->fNewColors = 0;
   }

   gCws->fOpen = 0;

   // make first window in list the current window
   for (Int_t wid = 0; wid < fMaxNumberOfWindows; wid++)
      if (fWindows[wid].fOpen) {
         gCws = &fWindows[wid];
         return;
      }

   gCws = 0;
}

//______________________________________________________________________________
void TGX11::QueryPointer(int &ix, int &iy)
{
   // Query pointer position.
   // ix       : X coordinate of pointer
   // iy       : Y coordinate of pointer
   // (both coordinates are relative to the origin of the root window)

   Window    root_return, child_return;
   int       win_x_return, win_y_return;
   int       root_x_return, root_y_return;
   unsigned int mask_return;

   XQueryPointer(fDisplay,gCws->fWindow, &root_return,
                 &child_return, &root_x_return, &root_y_return, &win_x_return,
                 &win_y_return, &mask_return);

   ix = root_x_return;
   iy = root_y_return;
}

//______________________________________________________________________________
void  TGX11::RemovePixmap(Drawable *pix)
{
   // Remove the pixmap pix.

   XFreePixmap(fDisplay,*pix);
}

//______________________________________________________________________________
Int_t TGX11::RequestLocator(int mode, int ctyp, int &x, int &y)
{
   // Request Locator position.
   // x,y       : cursor position at moment of button press (output)
   // ctyp      : cursor type (input)
   //   ctyp=1 tracking cross
   //   ctyp=2 cross-hair
   //   ctyp=3 rubber circle
   //   ctyp=4 rubber band
   //   ctyp=5 rubber rectangle
   //
   // mode      : input mode
   //   mode=0 request
   //   mode=1 sample
   //
   // Request locator:
   // return button number  1 = left is pressed
   //                       2 = middle is pressed
   //                       3 = right is pressed
   //        in sample mode:
   //                      11 = left is released
   //                      12 = middle is released
   //                      13 = right is released
   //                      -1 = nothing is pressed or released
   //                      -2 = leave the window
   //                    else = keycode (keyboard is pressed)

   static int xloc  = 0;
   static int yloc  = 0;
   static int xlocp = 0;
   static int ylocp = 0;
   static Cursor cursor = 0;

   XEvent event;
   int button_press;
   int radius;

   // Change the cursor shape
   if (cursor == 0) {
      if (ctyp > 1) {
         XDefineCursor(fDisplay, gCws->fWindow, gNullCursor);
         XSetForeground(fDisplay, gGCecho, GetColor(0).fPixel);
      } else {
         cursor = XCreateFontCursor(fDisplay, XC_crosshair);
         XDefineCursor(fDisplay, gCws->fWindow, cursor);
      }
   }

   // Event loop

   button_press = 0;

   while (button_press == 0) {

      switch (ctyp) {

         case 1 :
            break;

         case 2 :
            XDrawLine(fDisplay, gCws->fWindow, gGCecho,
                      xloc, 0, xloc, gCws->fHeight);
            XDrawLine(fDisplay, gCws->fWindow, gGCecho,
                      0, yloc, gCws->fWidth, yloc);
            break;

         case 3 :
            radius = (int) TMath::Sqrt((double)((xloc-xlocp)*(xloc-xlocp) +
                                       (yloc-ylocp)*(yloc-ylocp)));
            XDrawArc(fDisplay, gCws->fWindow, gGCecho,
                     xlocp-radius, ylocp-radius,
                     2*radius, 2*radius, 0, 23040);
            break;

         case 4 :
            XDrawLine(fDisplay, gCws->fWindow, gGCecho,
                      xlocp, ylocp, xloc, yloc);
            break;

         case 5 :
            XDrawRectangle(fDisplay, gCws->fWindow, gGCecho,
                           TMath::Min(xlocp,xloc), TMath::Min(ylocp,yloc),
                           TMath::Abs(xloc-xlocp), TMath::Abs(yloc-ylocp));
            break;

         default:
            break;
      }

      while (XEventsQueued( fDisplay, QueuedAlready) > 1) {
         XNextEvent(fDisplay, &event);
      }
      XWindowEvent(fDisplay, gCws->fWindow, gMouseMask, &event);

      switch (ctyp) {

         case 1 :
            break;

         case 2 :
            XDrawLine(fDisplay, gCws->fWindow, gGCecho,
                      xloc, 0, xloc, gCws->fHeight);
            XDrawLine(fDisplay, gCws->fWindow, gGCecho,
                      0, yloc, gCws->fWidth, yloc);
            break;

         case 3 :
            radius = (int) TMath::Sqrt((double)((xloc-xlocp)*(xloc-xlocp) +
                                           (yloc-ylocp)*(yloc-ylocp)));
            XDrawArc(fDisplay, gCws->fWindow, gGCecho,
                     xlocp-radius, ylocp-radius,
                     2*radius, 2*radius, 0, 23040);
            break;

         case 4 :
            XDrawLine(fDisplay, gCws->fWindow, gGCecho,
                      xlocp, ylocp, xloc, yloc);
            break;

         case 5 :
            XDrawRectangle(fDisplay, gCws->fWindow, gGCecho,
                           TMath::Min(xlocp,xloc), TMath::Min(ylocp,yloc),
                           TMath::Abs(xloc-xlocp), TMath::Abs(yloc-ylocp));
            break;

         default:
            break;
      }

      xloc = event.xbutton.x;
      yloc = event.xbutton.y;

      switch (event.type) {

         case LeaveNotify :
            if (mode == 0) {
               while (1) {
                  XNextEvent(fDisplay, &event);
                  if (event.type == EnterNotify) break;
               }
            } else {
               button_press = -2;
            }
            break;

         case ButtonPress :
            button_press = event.xbutton.button ;
            xlocp = event.xbutton.x;
            ylocp = event.xbutton.y;
            XUndefineCursor( fDisplay, gCws->fWindow );
            cursor = 0;
            break;

         case ButtonRelease :
            if (mode == 1) {
               button_press = 10+event.xbutton.button ;
               xlocp = event.xbutton.x;
               ylocp = event.xbutton.y;
            }
            break;

         case KeyPress :
            if (mode == 1) {
               button_press = event.xkey.keycode;
               xlocp = event.xbutton.x;
               ylocp = event.xbutton.y;
            }
            break;

         case KeyRelease :
            if (mode == 1) {
               button_press = -event.xkey.keycode;
               xlocp = event.xbutton.x;
               ylocp = event.xbutton.y;
            }
            break;

         default :
            break;
      }

      if (mode == 1) {
         if (button_press == 0)
            button_press = -1;
         break;
      }
   }
   x = event.xbutton.x;
   y = event.xbutton.y;

   return button_press;
}

//______________________________________________________________________________
Int_t TGX11::RequestString(int x, int y, char *text)
{
   // Request a string.
   // x,y         : position where text is displayed
   // text        : text displayed (input), edited text (output)
   //
   // Request string:
   // text is displayed and can be edited with Emacs-like keybinding
   // return termination code (0 for ESC, 1 for RETURN)

   static Cursor cursor = 0;
   static int percent = 0;  // bell volume
   Window focuswindow;
   int focusrevert;
   XEvent event;
   KeySym keysym;
   int key = -1;
   int len_text = strlen(text);
   int nt;         // defined length of text
   int pt;         // cursor position in text

   // change the cursor shape
   if (cursor == 0) {
      XKeyboardState kbstate;
      cursor = XCreateFontCursor(fDisplay, XC_question_arrow);
      XGetKeyboardControl(fDisplay, &kbstate);
      percent = kbstate.bell_percent;
   }
   if (cursor != 0)
      XDefineCursor(fDisplay, gCws->fWindow, cursor);
   for (nt = len_text; nt > 0 && text[nt-1] == ' '; nt--);
      pt = nt;
   XGetInputFocus(fDisplay, &focuswindow, &focusrevert);
   XSetInputFocus(fDisplay, gCws->fWindow, focusrevert, CurrentTime);
   while (key < 0) {
      char keybuf[8];
      char nbytes;
      int dx;
      int i;
      XDrawImageString(fDisplay, gCws->fWindow, *gGCtext, x, y, text, nt);
      dx = XTextWidth(gTextFont, text, nt);
      XDrawImageString(fDisplay, gCws->fWindow, *gGCtext, x + dx, y, " ", 1);
      dx = pt == 0 ? 0 : XTextWidth(gTextFont, text, pt);
      XDrawImageString(fDisplay, gCws->fWindow, *gGCinvt,
                       x + dx, y, pt < len_text ? &text[pt] : " ", 1);
      XWindowEvent(fDisplay, gCws->fWindow, gKeybdMask, &event);
      switch (event.type) {
         case ButtonPress:
         case EnterNotify:
            XSetInputFocus(fDisplay, gCws->fWindow, focusrevert, CurrentTime);
            break;
         case LeaveNotify:
            XSetInputFocus(fDisplay, focuswindow, focusrevert, CurrentTime);
            break;
         case KeyPress:
            nbytes = XLookupString(&event.xkey, keybuf, sizeof(keybuf),
                                   &keysym, 0);
            switch (keysym) {      // map cursor keys
               case XK_Left:
                  keybuf[0] = '\002';  // Control-B
                  nbytes = 1;
                  break;
               case XK_Right:
                  keybuf[0] = '\006';  // Control-F
                  nbytes = 1;
                  break;
            }
            if (nbytes == 1) {
            if (isascii(keybuf[0]) && isprint(keybuf[0])) {
               // insert character
               if (nt < len_text)
                  nt++;
               for (i = nt - 1; i > pt; i--)
                  text[i] = text[i-1];
               if (pt < len_text) {
                  text[pt] = keybuf[0];
                  pt++;
               }
            } else
               switch (keybuf[0]) {
                  // Emacs-like editing keys

                  case '\010':    // backspace
                  case '\177':    // delete
                     // delete backward
                     if (pt > 0) {
                        for (i = pt; i < nt; i++)
                           text[i-1] = text[i];
                        text[nt-1] = ' ';
                        nt--;
                        pt--;
                     }
                     break;
                  case '\001':    // ^A
                     // beginning of line
                     pt = 0;
                     break;
                  case '\002':    // ^B
                     // move backward
                     if (pt > 0)
                        pt--;
                     break;
                  case '\004':    // ^D
                     // delete forward
                     if (pt > 0) {
                        for (i = pt; i < nt; i++)
                           text[i-1] = text[i];
                        text[nt-1] = ' ';
                        pt--;
                     }
                     break;
                  case '\005':    // ^E
                     // end of line
                     pt = nt;
                     break;

                  case '\006':    // ^F
                     // move forward
                     if (pt < nt)
                        pt++;
                     break;
                  case '\013':    // ^K
                     // delete to end of line
                     for (i = pt; i < nt; i++)
                        text[i] = ' ';
                     nt = pt;
                     break;
                  case '\024':    // ^T
                     // transpose
                     if (pt > 0) {
                        char c = text[pt];
                        text[pt] = text[pt-1];
                        text[pt-1] = c;
                     }
                     break;
                  case '\012':    // newline
                  case '\015':    // return
                     key = 1;
                     break;
                  case '\033':    // escape
                     key = 0;
                     break;

                  default:
                     XBell(fDisplay, percent);
               }
            }
      }
   }
   XSetInputFocus(fDisplay, focuswindow, focusrevert, CurrentTime);

   if (cursor != 0) {
      XUndefineCursor(fDisplay, gCws->fWindow);
      cursor = 0;
   }

   return key;
}

//______________________________________________________________________________
void TGX11::RescaleWindow(int wid, unsigned int w, unsigned int h)
{
   // Rescale the window wid.
   // wid  : Window identifier
   // w    : Width
   // h    : Heigth

   int i;

   gTws = &fWindows[wid];
   if (!gTws->fOpen) return;

   // don't do anything when size did not change
   if (gTws->fWidth == w && gTws->fHeight == h) return;

   XResizeWindow(fDisplay, gTws->fWindow, w, h);

   if (gTws->fBuffer) {
      // don't free and recreate pixmap when new pixmap is smaller
      if (gTws->fWidth < w || gTws->fHeight < h) {
         XFreePixmap(fDisplay,gTws->fBuffer);
         gTws->fBuffer = XCreatePixmap(fDisplay, fRootWin, w, h, fDepth);
      }
      for (i = 0; i < kMAXGC; i++) XSetClipMask(fDisplay, gGClist[i], None);
      SetColor(*gGCpxmp, 0);
      XFillRectangle( fDisplay, gTws->fBuffer, *gGCpxmp, 0, 0, w, h);
      SetColor(*gGCpxmp, 1);
      if (gTws->fDoubleBuffer) gTws->fDrawing = gTws->fBuffer;
   }
   gTws->fWidth  = w;
   gTws->fHeight = h;
}

//______________________________________________________________________________
int TGX11::ResizePixmap(int wid, unsigned int w, unsigned int h)
{
   // Resize a pixmap.
   // wid : pixmap to be resized
   // w,h : Width and height of the pixmap

   Window root;
   unsigned int wval, hval;
   int xx, yy, i;
   unsigned int ww, hh, border, depth;
   wval = w;
   hval = h;

   gTws = &fWindows[wid];

   // don't do anything when size did not change
   //  if (gTws->fWidth == wval && gTws->fHeight == hval) return 0;

   // due to round-off errors in TPad::Resize() we might get +/- 1 pixel
   // change, in those cases don't resize pixmap
   if (gTws->fWidth  >= wval-1 && gTws->fWidth  <= wval+1 &&
       gTws->fHeight >= hval-1 && gTws->fHeight <= hval+1) return 0;

   // don't free and recreate pixmap when new pixmap is smaller
   if (gTws->fWidth < wval || gTws->fHeight < hval) {
      XFreePixmap(fDisplay, gTws->fWindow);
      gTws->fWindow = XCreatePixmap(fDisplay, fRootWin, wval, hval, fDepth);
   }
   XGetGeometry(fDisplay, gTws->fWindow, &root, &xx, &yy, &ww, &hh, &border, &depth);

   for (i = 0; i < kMAXGC; i++)
      XSetClipMask(fDisplay, gGClist[i], None);

   SetColor(*gGCpxmp, 0);
   XFillRectangle(fDisplay, gTws->fWindow, *gGCpxmp, 0, 0, ww, hh);
   SetColor(*gGCpxmp, 1);

   // Initialise the window structure
   gTws->fDrawing = gTws->fWindow;
   gTws->fWidth   = wval;
   gTws->fHeight  = hval;

   return 1;
}

//______________________________________________________________________________
void TGX11::ResizeWindow(int wid)
{
   // Resize the current window if necessary.

   int i;
   int xval=0, yval=0;
   Window win, root=0;
   unsigned int wval=0, hval=0, border=0, depth=0;

   gTws = &fWindows[wid];

   win = gTws->fWindow;

   XGetGeometry(fDisplay, win, &root,
                &xval, &yval, &wval, &hval, &border, &depth);
   if (wval >= 65500) wval = 1;
   if (hval >= 65500) hval = 1;

   // don't do anything when size did not change
   if (gTws->fWidth == wval && gTws->fHeight == hval) return;

   XResizeWindow(fDisplay, gTws->fWindow, wval, hval);

   if (gTws->fBuffer) {
      if (gTws->fWidth < wval || gTws->fHeight < hval) {
         XFreePixmap(fDisplay,gTws->fBuffer);
         gTws->fBuffer = XCreatePixmap(fDisplay, fRootWin, wval, hval, fDepth);
      }
      for (i = 0; i < kMAXGC; i++) XSetClipMask(fDisplay, gGClist[i], None);
      SetColor(*gGCpxmp, 0);
      XFillRectangle(fDisplay, gTws->fBuffer, *gGCpxmp, 0, 0, wval, hval);
      SetColor(*gGCpxmp, 1);
      if (gTws->fDoubleBuffer) gTws->fDrawing = gTws->fBuffer;
   }
   gTws->fWidth  = wval;
   gTws->fHeight = hval;
}

//______________________________________________________________________________
void TGX11::SelectWindow(int wid)
{
   // Select window to which subsequent output is directed.

   XRectangle region;
   int i;

   if (wid < 0 || wid >= fMaxNumberOfWindows || !fWindows[wid].fOpen) return;

   gCws = &fWindows[wid];

   if (gCws->fClip && !gCws->fIsPixmap && !gCws->fDoubleBuffer) {
      region.x      = gCws->fXclip;
      region.y      = gCws->fYclip;
      region.width  = gCws->fWclip;
      region.height = gCws->fHclip;
      for (i = 0; i < kMAXGC; i++)
         XSetClipRectangles(fDisplay, gGClist[i], 0, 0, &region, 1, YXBanded);
   } else {
      for (i = 0; i < kMAXGC; i++)
         XSetClipMask(fDisplay, gGClist[i], None);
   }
}

//______________________________________________________________________________
void TGX11::SetCharacterUp(Float_t chupx, Float_t chupy)
{
   // Set character up vector.

   if (chupx == fCharacterUpX  && chupy == fCharacterUpY) return;

   if      (chupx == 0  && chupy == 0)  fTextAngle = 0;
   else if (chupx == 0  && chupy == 1)  fTextAngle = 0;
   else if (chupx == -1 && chupy == 0)  fTextAngle = 90;
   else if (chupx == 0  && chupy == -1) fTextAngle = 180;
   else if (chupx == 1  && chupy ==  0) fTextAngle = 270;
   else {
      fTextAngle = ((TMath::ACos(chupx/TMath::Sqrt(chupx*chupx +chupy*chupy))*180.)/TMath::Pi())-90;
      if (chupy < 0) fTextAngle = 180 - fTextAngle;
      if (TMath::Abs(fTextAngle) <= 0.01) fTextAngle = 0;
   }
   fCharacterUpX = chupx;
   fCharacterUpY = chupy;
}

//______________________________________________________________________________
void TGX11::SetClipOFF(int wid)
{
   // Turn off the clipping for the window wid.

   gTws       = &fWindows[wid];
   gTws->fClip = 0;

   for (int i = 0; i < kMAXGC; i++)
      XSetClipMask( fDisplay, gGClist[i], None );
}

//______________________________________________________________________________
void TGX11::SetClipRegion(int wid, int x, int y, unsigned int w, unsigned int h)
{
   // Set clipping region for the window wid.
   // wid        : Window indentifier
   // x,y        : origin of clipping rectangle
   // w,h        : size of clipping rectangle;


   gTws = &fWindows[wid];
   gTws->fXclip = x;
   gTws->fYclip = y;
   gTws->fWclip = w;
   gTws->fHclip = h;
   gTws->fClip  = 1;
   if (gTws->fClip && !gTws->fIsPixmap && !gTws->fDoubleBuffer) {
      XRectangle region;
      region.x      = gTws->fXclip;
      region.y      = gTws->fYclip;
      region.width  = gTws->fWclip;
      region.height = gTws->fHclip;
      for (int i = 0; i < kMAXGC; i++)
         XSetClipRectangles(fDisplay, gGClist[i], 0, 0, &region, 1, YXBanded);
   }
}

//______________________________________________________________________________
void  TGX11::SetColor(GC gc, int ci)
{
   // Set the foreground color in GC.

   TColor *color = gROOT->GetColor(ci);
   if (color)
      SetRGB(ci, color->GetRed(), color->GetGreen(), color->GetBlue());
//   else
//      Warning("SetColor", "color with index %d not defined", ci);

   XColor_t &col = GetColor(ci);
   if (fColormap && !col.fDefined) {
      col = GetColor(0);
   } else if (!fColormap && (ci < 0 || ci > 1)) {
      col = GetColor(0);
   }

   if (fDrawMode == kXor) {
      XGCValues values;
      XGetGCValues(fDisplay, gc, GCBackground, &values);
      XSetForeground(fDisplay, gc, col.fPixel ^ values.background);
   } else {
      XSetForeground(fDisplay, gc, col.fPixel);

      // make sure that foreground and background are different
      XGCValues values;
      XGetGCValues(fDisplay, gc, GCForeground | GCBackground, &values);
      if (values.foreground == values.background)
         XSetBackground(fDisplay, gc, GetColor(!ci).fPixel);
   }
}

//______________________________________________________________________________
void  TGX11::SetCursor(int wid, ECursor cursor)
{
   // Set the cursor.

   gTws = &fWindows[wid];
   XDefineCursor(fDisplay, gTws->fWindow, fCursors[cursor]);
}

//______________________________________________________________________________
void TGX11::SetDoubleBuffer(int wid, int mode)
{
   // Set the double buffer on/off on window wid.
   // wid  : Window identifier.
   //        999 means all the opened windows.
   // mode : 1 double buffer is on
   //        0 double buffer is off

   if (wid == 999) {
      for (int i = 0; i < fMaxNumberOfWindows; i++) {
         gTws = &fWindows[i];
         if (gTws->fOpen) {
            switch (mode) {
               case 1 :
                  SetDoubleBufferON();
                  break;
               default:
                  SetDoubleBufferOFF();
                  break;
            }
         }
      }
   } else {
      gTws = &fWindows[wid];
      if (!gTws->fOpen) return;
      switch (mode) {
         case 1 :
            SetDoubleBufferON();
            return;
         default:
            SetDoubleBufferOFF();
            return;
      }
   }
}

//______________________________________________________________________________
void TGX11::SetDoubleBufferOFF()
{
   // Turn double buffer mode off.

   if (!gTws->fDoubleBuffer) return;
   gTws->fDoubleBuffer = 0;
   gTws->fDrawing      = gTws->fWindow;
}

//______________________________________________________________________________
void TGX11::SetDoubleBufferON()
{
   // Turn double buffer mode on.

   if (gTws->fDoubleBuffer || gTws->fIsPixmap) return;
   if (!gTws->fBuffer) {
      gTws->fBuffer = XCreatePixmap(fDisplay, fRootWin,
                                   gTws->fWidth, gTws->fHeight, fDepth);
      SetColor(*gGCpxmp, 0);
      XFillRectangle(fDisplay, gTws->fBuffer, *gGCpxmp, 0, 0, gTws->fWidth, gTws->fHeight);
      SetColor(*gGCpxmp, 1);
   }
   for (int i = 0; i < kMAXGC; i++) XSetClipMask(fDisplay, gGClist[i], None);
   gTws->fDoubleBuffer  = 1;
   gTws->fDrawing       = gTws->fBuffer;
}

//______________________________________________________________________________
void TGX11::SetDrawMode(EDrawMode mode)
{
   // Set the drawing mode.
   // mode : drawing mode
   //   mode=1 copy
   //   mode=2 xor
   //   mode=3 invert
   //   mode=4 set the suitable mode for cursor echo according to
   //          the vendor

   int i;
   switch (mode) {
      case kCopy:
         for (i = 0; i < kMAXGC; i++) XSetFunction(fDisplay, gGClist[i], GXcopy);
         break;

      case kXor:
         for (i = 0; i < kMAXGC; i++) XSetFunction(fDisplay, gGClist[i], GXxor);
         break;

      case kInvert:
         for (i = 0; i < kMAXGC; i++) XSetFunction(fDisplay, gGClist[i], GXinvert);
         break;
   }
   fDrawMode = mode;
}

//______________________________________________________________________________
void TGX11::SetFillColor(Color_t cindex)
{
   // Set color index for fill areas.

   if (!gStyle->GetFillColor() && cindex > 1) cindex = 0;
   if (cindex >= 0) SetColor(*gGCfill, Int_t(cindex));
   fFillColor = cindex;

   // invalidate fill pattern
   if (gFillPattern != 0) {
      XFreePixmap(fDisplay, gFillPattern);
      gFillPattern = 0;
   }
}

//______________________________________________________________________________
void TGX11::SetFillStyle(Style_t fstyle)
{
   // Set fill area style.
   // fstyle   : compound fill area interior style
   //    fstyle = 1000*interiorstyle + styleindex

   if (fFillStyle == fstyle) return;
   fFillStyle = fstyle;
   Int_t style = fstyle/1000;
   Int_t fasi  = fstyle%1000;
   SetFillStyleIndex(style,fasi);
}

//______________________________________________________________________________
void TGX11::SetFillStyleIndex(Int_t style, Int_t fasi)
{
   // Set fill area style index.

   static int current_fasi = 0;

   fFillStyle = 1000*style + fasi;

   switch (style) {

      case 1:         // solid
         gFillHollow = 0;
         XSetFillStyle(fDisplay, *gGCfill, FillSolid);
         break;

      case 2:         // pattern
         gFillHollow = 1;
         break;

      case 3:         // hatch
         gFillHollow = 0;
         XSetFillStyle(fDisplay, *gGCfill, FillStippled);
         if (fasi != current_fasi) {
            if (gFillPattern != 0) {
               XFreePixmap(fDisplay, gFillPattern);
               gFillPattern = 0;
            }
            int stn = (fasi >= 1 && fasi <=25) ? fasi : 2;

            gFillPattern = XCreateBitmapFromData(fDisplay, fRootWin,
                                                 gStipples[stn], 16, 16);

            XSetStipple( fDisplay, *gGCfill, gFillPattern );
            current_fasi = fasi;
         }
         break;

      default:
         gFillHollow = 1;
   }
}

//______________________________________________________________________________
void TGX11::SetInput(int inp)
{
   // Set input on or off.

   XSetWindowAttributes attributes;
   ULong_t attr_mask;

   if (inp == 1) {
      attributes.event_mask = gMouseMask | gKeybdMask;
      attr_mask = CWEventMask;
      XChangeWindowAttributes(fDisplay, gCws->fWindow, attr_mask, &attributes);
   } else {
      attributes.event_mask = NoEventMask;
      attr_mask = CWEventMask;
      XChangeWindowAttributes(fDisplay, gCws->fWindow, attr_mask, &attributes);
   }
}

//______________________________________________________________________________
void TGX11::SetLineColor(Color_t cindex)
{
   // Set color index for lines.

   if (cindex < 0) return;

   SetColor(*gGCline, Int_t(cindex));
   SetColor(*gGCdash, Int_t(cindex));
}

//______________________________________________________________________________
void TGX11::SetLineType(int n, int *dash)
{
   // Set line type.
   // n         : length of dash list
   // dash(n)   : dash segment lengths
   //
   // if n <= 0 use solid lines
   // if n >  0 use dashed lines described by DASH(N)
   //    e.g. N=4,DASH=(6,3,1,3) gives a dashed-dotted line with dash length 6
   //    and a gap of 7 between dashes

   if (n <= 0) {
      gLineStyle = LineSolid;
      XSetLineAttributes(fDisplay, *gGCline, gLineWidth,
                         gLineStyle, gCapStyle, gJoinStyle);
   } else {
      gDashSize = TMath::Min((int)sizeof(gDashList),n);
      gDashLength = 0;
      for (int i = 0; i < gDashSize; i++ ) {
         gDashList[i] = dash[i];
         gDashLength += gDashList[i];
      }
      gDashOffset = 0;
      gLineStyle = LineOnOffDash;
      XSetLineAttributes(fDisplay, *gGCline, gLineWidth,
                         gLineStyle, gCapStyle, gJoinStyle);
      XSetLineAttributes(fDisplay, *gGCdash, gLineWidth,
                         gLineStyle, gCapStyle, gJoinStyle);
   }
}

//______________________________________________________________________________
void TGX11::SetLineStyle(Style_t lstyle)
{
   // Set line style.

   static Int_t dashed[2] = {3,3};
   static Int_t dotted[2] = {1,2};
   static Int_t dasheddotted[4] = {3,4,1,4};

   if (fLineStyle != lstyle) { //set style index only if different
      fLineStyle = lstyle;
      if (lstyle <= 1 ) {
         SetLineType(0,0);
      } else if (lstyle == 2 ) {
         SetLineType(2,dashed);
      } else if (lstyle == 3 ) {
         SetLineType(2,dotted);
      } else if (lstyle == 4 ) {
         SetLineType(4,dasheddotted);
      } else {
         TString st = (TString)gStyle->GetLineStyleString(lstyle);
         TObjArray *tokens = st.Tokenize(" ");
         Int_t nt;
         nt = tokens->GetEntries();
         Int_t *linestyle = new Int_t[nt];
         for (Int_t j = 0; j<nt; j++) {
            Int_t it;
            sscanf(((TObjString*)tokens->At(j))->GetName(), "%d", &it);
            linestyle[j] = (Int_t)(it/4);
         }
         SetLineType(nt,linestyle);
         delete [] linestyle;
         delete tokens;
      }
   }
}

//______________________________________________________________________________
void TGX11::SetLineWidth(Width_t width )
{
   // Set line width.
   // width   : line width in pixels

   if (fLineWidth == width) return;
   if (width == 1) gLineWidth = 0;
   else            gLineWidth = width;

   fLineWidth = gLineWidth;
   if (gLineWidth < 0) return;

   XSetLineAttributes(fDisplay, *gGCline, gLineWidth,
                      gLineStyle, gCapStyle, gJoinStyle);
   XSetLineAttributes(fDisplay, *gGCdash, gLineWidth,
              gLineStyle, gCapStyle, gJoinStyle);
}

//______________________________________________________________________________
void TGX11::SetMarkerColor(Color_t cindex)
{
   // Set color index for markers.

   if (cindex < 0) return;

   SetColor(*gGCmark, Int_t(cindex));
}

//______________________________________________________________________________
void TGX11::SetMarkerSize(Float_t msize)
{
   // Set marker size index.
   // msize  : marker scale factor

   if (msize == fMarkerSize) return;

   fMarkerSize = msize;
   if (msize < 0) return;

   SetMarkerStyle(-fMarkerStyle);
}

//______________________________________________________________________________
void TGX11::SetMarkerType(int type, int n, XPoint *xy)
{
   // Set marker type.
   // type      : marker type
   // n         : length of marker description
   // xy        : list of points describing marker shape
   //
   // if n == 0 marker is a single point
   // if TYPE == 0 marker is hollow circle of diameter N
   // if TYPE == 1 marker is filled circle of diameter N
   // if TYPE == 2 marker is a hollow polygon describe by line XY
   // if TYPE == 3 marker is a filled polygon describe by line XY
   // if TYPE == 4 marker is described by segmented line XY
   //   e.g. TYPE=4,N=4,XY=(-3,0,3,0,0,-3,0,3) sets a plus shape of 7x7 pixels

   gMarker.type = type;
   gMarker.n = n < kMAXMK ? n : kMAXMK;
   if (gMarker.type >= 2)
      for (int i = 0; i < gMarker.n; i++)
         gMarker.xy[i] = xy[i];
}

//______________________________________________________________________________
void TGX11::SetMarkerStyle(Style_t markerstyle)
{
   // Set marker style.

   if (fMarkerStyle == markerstyle) return;
   static XPoint shape[15];
   if (markerstyle >= 31) return;
   markerstyle  = TMath::Abs(markerstyle);
   fMarkerStyle = markerstyle;
   Int_t im = Int_t(4*fMarkerSize + 0.5);
   if (markerstyle == 2) {
      // + shaped marker
      shape[0].x = -im;  shape[0].y = 0;
      shape[1].x =  im;  shape[1].y = 0;
      shape[2].x = 0  ;  shape[2].y = -im;
      shape[3].x = 0  ;  shape[3].y = im;
      SetMarkerType(4,4,shape);
   } else if (markerstyle == 3) {
      // * shaped marker
      shape[0].x = -im;  shape[0].y = 0;
      shape[1].x =  im;  shape[1].y = 0;
      shape[2].x = 0  ;  shape[2].y = -im;
      shape[3].x = 0  ;  shape[3].y = im;
      im = Int_t(0.707*Float_t(im) + 0.5);
      shape[4].x = -im;  shape[4].y = -im;
      shape[5].x =  im;  shape[5].y = im;
      shape[6].x = -im;  shape[6].y = im;
      shape[7].x =  im;  shape[7].y = -im;
      SetMarkerType(4,8,shape);
   } else if (markerstyle == 4 || markerstyle == 24) {
      // O shaped marker
      SetMarkerType(0,im*2,shape);
   } else if (markerstyle == 5) {
      // X shaped marker
      im = Int_t(0.707*Float_t(im) + 0.5);
      shape[0].x = -im;  shape[0].y = -im;
      shape[1].x =  im;  shape[1].y = im;
      shape[2].x = -im;  shape[2].y = im;
      shape[3].x =  im;  shape[3].y = -im;
      SetMarkerType(4,4,shape);
   } else if (markerstyle == 6) {
      // + shaped marker (with 1 pixel)
      shape[0].x = -1 ;  shape[0].y = 0;
      shape[1].x =  1 ;  shape[1].y = 0;
      shape[2].x =  0 ;  shape[2].y = -1;
      shape[3].x =  0 ;  shape[3].y = 1;
      SetMarkerType(4,4,shape);
   } else if (markerstyle == 7) {
      // . shaped marker (with 9 pixel)
      shape[0].x = -1 ;  shape[0].y = 1;
      shape[1].x =  1 ;  shape[1].y = 1;
      shape[2].x = -1 ;  shape[2].y = 0;
      shape[3].x =  1 ;  shape[3].y = 0;
      shape[4].x = -1 ;  shape[4].y = -1;
      shape[5].x =  1 ;  shape[5].y = -1;
      SetMarkerType(4,6,shape);
   } else if (markerstyle == 8 || markerstyle == 20) {
      // O shaped marker (filled)
      SetMarkerType(1,im*2,shape);
   } else if (markerstyle == 21) {   // here start the old HIGZ symbols
      // HIGZ full square
      shape[0].x = -im;  shape[0].y = -im;
      shape[1].x =  im;  shape[1].y = -im;
      shape[2].x =  im;  shape[2].y = im;
      shape[3].x = -im;  shape[3].y = im;
      shape[4].x = -im;  shape[4].y = -im;
      SetMarkerType(3,5,shape);
   } else if (markerstyle == 22) {
      // HIGZ full triangle up
      shape[0].x = -im;  shape[0].y = im;
      shape[1].x =  im;  shape[1].y = im;
      shape[2].x =   0;  shape[2].y = -im;
      shape[3].x = -im;  shape[3].y = im;
      SetMarkerType(3,4,shape);
   } else if (markerstyle == 23) {
      // HIGZ full triangle down
      shape[0].x =   0;  shape[0].y = im;
      shape[1].x =  im;  shape[1].y = -im;
      shape[2].x = -im;  shape[2].y = -im;
      shape[3].x =   0;  shape[3].y = im;
      SetMarkerType(3,4,shape);
   } else if (markerstyle == 25) {
      // HIGZ open square
      shape[0].x = -im;  shape[0].y = -im;
      shape[1].x =  im;  shape[1].y = -im;
      shape[2].x =  im;  shape[2].y = im;
      shape[3].x = -im;  shape[3].y = im;
      shape[4].x = -im;  shape[4].y = -im;
      SetMarkerType(2,5,shape);
   } else if (markerstyle == 26) {
      // HIGZ open triangle up
      shape[0].x = -im;  shape[0].y = im;
      shape[1].x =  im;  shape[1].y = im;
      shape[2].x =   0;  shape[2].y = -im;
      shape[3].x = -im;  shape[3].y = im;
      SetMarkerType(2,4,shape);
   } else if (markerstyle == 27) {
      // HIGZ open losange
      Int_t imx = Int_t(2.66*fMarkerSize + 0.5);
      shape[0].x =-imx;  shape[0].y = 0;
      shape[1].x =   0;  shape[1].y = -im;
      shape[2].x = imx;  shape[2].y = 0;
      shape[3].x =   0;  shape[3].y = im;
      shape[4].x =-imx;  shape[4].y = 0;
      SetMarkerType(2,5,shape);
   } else if (markerstyle == 28) {
      // HIGZ open cross
      Int_t imx = Int_t(1.33*fMarkerSize + 0.5);
      shape[0].x = -im;  shape[0].y =-imx;
      shape[1].x =-imx;  shape[1].y =-imx;
      shape[2].x =-imx;  shape[2].y = -im;
      shape[3].x = imx;  shape[3].y = -im;
      shape[4].x = imx;  shape[4].y =-imx;
      shape[5].x =  im;  shape[5].y =-imx;
      shape[6].x =  im;  shape[6].y = imx;
      shape[7].x = imx;  shape[7].y = imx;
      shape[8].x = imx;  shape[8].y = im;
      shape[9].x =-imx;  shape[9].y = im;
      shape[10].x=-imx;  shape[10].y= imx;
      shape[11].x= -im;  shape[11].y= imx;
      shape[12].x= -im;  shape[12].y=-imx;
      SetMarkerType(2,13,shape);
   } else if (markerstyle == 29) {
      // HIGZ full star pentagone
      Int_t im1 = Int_t(0.66*fMarkerSize + 0.5);
      Int_t im2 = Int_t(2.00*fMarkerSize + 0.5);
      Int_t im3 = Int_t(2.66*fMarkerSize + 0.5);
      Int_t im4 = Int_t(1.33*fMarkerSize + 0.5);
      shape[0].x = -im;  shape[0].y = im4;
      shape[1].x =-im2;  shape[1].y =-im1;
      shape[2].x =-im3;  shape[2].y = -im;
      shape[3].x =   0;  shape[3].y =-im2;
      shape[4].x = im3;  shape[4].y = -im;
      shape[5].x = im2;  shape[5].y =-im1;
      shape[6].x =  im;  shape[6].y = im4;
      shape[7].x = im4;  shape[7].y = im4;
      shape[8].x =   0;  shape[8].y = im;
      shape[9].x =-im4;  shape[9].y = im4;
      shape[10].x= -im;  shape[10].y= im4;
      SetMarkerType(3,11,shape);
   } else if (markerstyle == 30) {
      // HIGZ open star pentagone
      Int_t im1 = Int_t(0.66*fMarkerSize + 0.5);
      Int_t im2 = Int_t(2.00*fMarkerSize + 0.5);
      Int_t im3 = Int_t(2.66*fMarkerSize + 0.5);
      Int_t im4 = Int_t(1.33*fMarkerSize + 0.5);
      shape[0].x = -im;  shape[0].y = im4;
      shape[1].x =-im2;  shape[1].y =-im1;
      shape[2].x =-im3;  shape[2].y = -im;
      shape[3].x =   0;  shape[3].y =-im2;
      shape[4].x = im3;  shape[4].y = -im;
      shape[5].x = im2;  shape[5].y =-im1;
      shape[6].x =  im;  shape[6].y = im4;
      shape[7].x = im4;  shape[7].y = im4;
      shape[8].x =   0;  shape[8].y = im;
      shape[9].x =-im4;  shape[9].y = im4;
      shape[10].x= -im;  shape[10].y= im4;
      SetMarkerType(2,11,shape);
   } else if (markerstyle == 31) {
      // HIGZ +&&x (kind of star)
      SetMarkerType(1,im*2,shape);
   } else {
      // single dot
      SetMarkerType(0,0,shape);
   }
}

//______________________________________________________________________________
void TGX11::SetOpacity(Int_t percent)
{
   // Set opacity of a window. This image manipulation routine works
   // by adding to a percent amount of neutral to each pixels RGB.
   // Since it requires quite some additional color map entries is it
   // only supported on displays with more than > 8 color planes (> 256
   // colors).

   if (fDepth <= 8) return;
   if (percent == 0) return;
   // if 100 percent then just make white

   ULong_t *orgcolors = 0, *tmpc = 0;
   Int_t    maxcolors = 0, ncolors, ntmpc = 0;

   // save previous allocated colors, delete at end when not used anymore
   if (gCws->fNewColors) {
      tmpc = gCws->fNewColors;
      ntmpc = gCws->fNcolors;
   }

   // get pixmap from server as image
   XImage *image = XGetImage(fDisplay, gCws->fDrawing, 0, 0, gCws->fWidth,
                             gCws->fHeight, AllPlanes, ZPixmap);

   // collect different image colors
   int x, y;
   for (y = 0; y < (int) gCws->fHeight; y++) {
      for (x = 0; x < (int) gCws->fWidth; x++) {
         ULong_t pixel = XGetPixel(image, x, y);
         CollectImageColors(pixel, orgcolors, ncolors, maxcolors);
      }
   }
   if (ncolors == 0) {
      XDestroyImage(image);
      ::operator delete(orgcolors);
      return;
   }

   // create opaque counter parts
   MakeOpaqueColors(percent, orgcolors, ncolors);

   // put opaque colors in image
   for (y = 0; y < (int) gCws->fHeight; y++) {
      for (x = 0; x < (int) gCws->fWidth; x++) {
         ULong_t pixel = XGetPixel(image, x, y);
         Int_t idx = FindColor(pixel, orgcolors, ncolors);
         XPutPixel(image, x, y, gCws->fNewColors[idx]);
      }
   }

   // put image back in pixmap on server
   XPutImage(fDisplay, gCws->fDrawing, *gGCpxmp, image, 0, 0, 0, 0,
             gCws->fWidth, gCws->fHeight);
   XFlush(fDisplay);

   // clean up
   if (tmpc) {
      if (fRedDiv == -1)
         XFreeColors(fDisplay, fColormap, tmpc, ntmpc, 0);
      delete [] tmpc;
   }
   XDestroyImage(image);
   ::operator delete(orgcolors);
}

//______________________________________________________________________________
void TGX11::CollectImageColors(ULong_t pixel, ULong_t *&orgcolors, Int_t &ncolors,
                               Int_t &maxcolors)
{
   // Collect in orgcolors all different original image colors.

   if (maxcolors == 0) {
      ncolors   = 0;
      maxcolors = 100;
      orgcolors = (ULong_t*) ::operator new(maxcolors*sizeof(ULong_t));
   }

   for (int i = 0; i < ncolors; i++)
      if (pixel == orgcolors[i]) return;

   if (ncolors >= maxcolors) {
      orgcolors = (ULong_t*) TStorage::ReAlloc(orgcolors,
          maxcolors*2*sizeof(ULong_t), maxcolors*sizeof(ULong_t));
      maxcolors *= 2;
   }

   orgcolors[ncolors++] = pixel;
}

//______________________________________________________________________________
void TGX11::MakeOpaqueColors(Int_t percent, ULong_t *orgcolors, Int_t ncolors)
{
   // Get RGB values for orgcolors, add percent neutral to the RGB and
   // allocate fNewColors.

   if (ncolors == 0) return;

   XColor *xcol = new XColor[ncolors];

   int i;
   for (i = 0; i < ncolors; i++) {
      xcol[i].pixel = orgcolors[i];
      xcol[i].red   = xcol[i].green = xcol[i].blue = 0;
      xcol[i].flags = DoRed | DoGreen | DoBlue;
   }
   QueryColors(fColormap, xcol, ncolors);

   UShort_t add = percent * kBIGGEST_RGB_VALUE / 100;

   Int_t val;
   for (i = 0; i < ncolors; i++) {
      val = xcol[i].red + add;
      if (val > kBIGGEST_RGB_VALUE) val = kBIGGEST_RGB_VALUE;
      xcol[i].red = (UShort_t) val;
      val = xcol[i].green + add;
      if (val > kBIGGEST_RGB_VALUE) val = kBIGGEST_RGB_VALUE;
      xcol[i].green = (UShort_t) val;
      val = xcol[i].blue + add;
      if (val > kBIGGEST_RGB_VALUE) val = kBIGGEST_RGB_VALUE;
      xcol[i].blue = (UShort_t) val;
      if (!AllocColor(fColormap, &xcol[i]))
         Warning("MakeOpaqueColors", "failed to allocate color %hd, %hd, %hd",
                 xcol[i].red, xcol[i].green, xcol[i].blue);
      // assumes that in case of failure xcol[i].pixel is not changed
   }

   gCws->fNewColors = new ULong_t[ncolors];
   gCws->fNcolors   = ncolors;

   for (i = 0; i < ncolors; i++)
      gCws->fNewColors[i] = xcol[i].pixel;

   delete [] xcol;
}

//______________________________________________________________________________
Int_t TGX11::FindColor(ULong_t pixel, ULong_t *orgcolors, Int_t ncolors)
{
   // Returns index in orgcolors (and fNewColors) for pixel.

   for (int i = 0; i < ncolors; i++)
      if (pixel == orgcolors[i]) return i;

   Error("FindColor", "did not find color, should never happen!");

   return 0;
}

//______________________________________________________________________________
void TGX11::SetRGB(int cindex, float r, float g, float b)
{
   // Set color intensities for given color index.
   // cindex     : color index
   // r,g,b      : red, green, blue intensities between 0.0 and 1.0

   if (fColormap) {
      XColor xcol;
      xcol.red   = (UShort_t)(r * kBIGGEST_RGB_VALUE);
      xcol.green = (UShort_t)(g * kBIGGEST_RGB_VALUE);
      xcol.blue  = (UShort_t)(b * kBIGGEST_RGB_VALUE);
      xcol.flags = DoRed || DoGreen || DoBlue;
      XColor_t &col = GetColor(cindex);
      if (col.fDefined) {
         // if color is already defined with same rgb just return
         if (col.fRed  == xcol.red && col.fGreen == xcol.green &&
             col.fBlue == xcol.blue)
            return;
         col.fDefined = kFALSE;
         if (fRedDiv == -1)
            XFreeColors(fDisplay, fColormap, &col.fPixel, 1, 0);
      }
      if (AllocColor(fColormap, &xcol)) {
         col.fDefined = kTRUE;
         col.fPixel  = xcol.pixel;
         col.fRed     = xcol.red;
         col.fGreen   = xcol.green;
         col.fBlue    = xcol.blue;
      }
   }
}

//______________________________________________________________________________
void TGX11::SetTextAlign(Short_t talign)
{
   // Set text alignment.
   // txalh   : horizontal text alignment
   // txalv   : vertical text alignment

   Int_t txalh = talign/10;
   Int_t txalv = talign%10;
   fTextAlignH = txalh;
   fTextAlignV = txalv;

   switch (txalh) {

      case 0 :
      case 1 :
         switch (txalv) {  //left
            case 1 :
               fTextAlign = 7;   //bottom
               break;
            case 2 :
               fTextAlign = 4;   //center
               break;
            case 3 :
               fTextAlign = 1;   //top
               break;
         }
         break;
      case 2 :
         switch (txalv) { //center
            case 1 :
               fTextAlign = 8;   //bottom
               break;
            case 2 :
               fTextAlign = 5;   //center
               break;
            case 3 :
               fTextAlign = 2;   //top
               break;
         }
         break;
      case 3 :
         switch (txalv) {  //right
            case 1 :
               fTextAlign = 9;   //bottom
               break;
            case 2 :
               fTextAlign = 6;   //center
               break;
            case 3 :
               fTextAlign = 3;   //top
               break;
         }
         break;
   }
}

//______________________________________________________________________________
void TGX11::SetTextColor(Color_t cindex)
{
   // Set color index for text.

   if (cindex < 0) return;

   SetColor(*gGCtext, Int_t(cindex));

   XGCValues values;
   if (XGetGCValues(fDisplay, *gGCtext, GCForeground | GCBackground, &values)) {
      XSetForeground( fDisplay, *gGCinvt, values.background );
      XSetBackground( fDisplay, *gGCinvt, values.foreground );
   } else {
      Error("SetTextColor", "cannot get GC values");
   }
   XSetBackground(fDisplay, *gGCtext, GetColor(0).fPixel);
}

//______________________________________________________________________________
Int_t TGX11::SetTextFont(char *fontname, ETextSetMode mode)
{
   // Set text font to specified name.
   // mode       : loading flag
   // mode=0     : search if the font exist (kCheck)
   // mode=1     : search the font and load it if it exists (kLoad)
   // font       : font name
   //
   // Set text font to specified name. This function returns 0 if
   // the specified font is found, 1 if not.

   char **fontlist;
   int fontcount;
   int i;

   if (mode == kLoad) {
      for (i = 0; i < kMAXFONT; i++) {
         if (strcmp(fontname, gFont[i].name) == 0) {
            gTextFont = gFont[i].id;
            XSetFont(fDisplay, *gGCtext, gTextFont->fid);
            XSetFont(fDisplay, *gGCinvt, gTextFont->fid);
            return 0;
         }
      }
   }

   fontlist = XListFonts(fDisplay, fontname, 1, &fontcount);

   if (fontcount != 0) {
      if (mode == kLoad) {
         if (gFont[gCurrentFontNumber].id)
            XFreeFont(fDisplay, gFont[gCurrentFontNumber].id);
         gTextFont = XLoadQueryFont(fDisplay, fontlist[0]);
         XSetFont(fDisplay, *gGCtext, gTextFont->fid);
         XSetFont(fDisplay, *gGCinvt, gTextFont->fid);
         gFont[gCurrentFontNumber].id = gTextFont;
         strcpy(gFont[gCurrentFontNumber].name,fontname);
         gCurrentFontNumber++;
         if (gCurrentFontNumber == kMAXFONT) gCurrentFontNumber = 0;
      }
      XFreeFontNames(fontlist);
      return 0;
   } else {
      return 1;
   }
}

//______________________________________________________________________________
void TGX11::SetTextFont(Font_t fontnumber)
{
   // Set current text font number.

   fTextFont = fontnumber;
}

//______________________________________________________________________________
void TGX11::SetTextSize(Float_t textsize)
{
   // Set current text size.

   fTextSize = textsize;
}

//______________________________________________________________________________
void TGX11::Sync(int mode)
{
   // Set synchronisation on or off.
   // mode : synchronisation on/off
   //    mode=1  on
   //    mode<>0 off

   switch (mode) {

      case 1 :
         XSynchronize(fDisplay,1);
         break;

      default:
         XSynchronize(fDisplay,0);
         break;
   }
}

//______________________________________________________________________________
void TGX11::UpdateWindow(int mode)
{
   // Update display.
   // mode : (1) update
   //        (0) sync
   //
   // Synchronise client and server once (not permanent).
   // Copy the pixmap gCws->fDrawing on the window gCws->fWindow
   // if the double buffer is on.

   if (gCws->fDoubleBuffer) {
      XCopyArea(fDisplay, gCws->fDrawing, gCws->fWindow,
                *gGCpxmp, 0, 0, gCws->fWidth, gCws->fHeight, 0, 0);
   }
   if (mode == 1) {
      XFlush(fDisplay);
   } else {
      XSync(fDisplay, False);
   }
}

//______________________________________________________________________________
void TGX11::Warp(Int_t ix, Int_t iy, Window_t id)
{
   // Set pointer position.
   // ix       : New X coordinate of pointer
   // iy       : New Y coordinate of pointer
   // Coordinates are relative to the origin of the window id
   // or to the origin of the current window if id == 0.

   if (!id) {
      // Causes problems when calling ProcessEvents()... BadWindow
      //XWarpPointer(fDisplay, None, gCws->fWindow, 0, 0, 0, 0, ix, iy);
   } else {
      XWarpPointer(fDisplay, None, (Window) id, 0, 0, 0, 0, ix, iy);
   }
}

//______________________________________________________________________________
void TGX11::WritePixmap(int wid, unsigned int w, unsigned int h, char *pxname)
{
   // Write the pixmap wid in the bitmap file pxname.
   // wid         : Pixmap address
   // w,h         : Width and height of the pixmap.
   // lenname     : pixmap name length
   // pxname      : pixmap name

   unsigned int wval, hval;
   wval = w;
   hval = h;

   gTws = &fWindows[wid];
   XWriteBitmapFile(fDisplay, pxname, gTws->fDrawing, wval, hval, -1, -1);
}


//
// Functions for GIFencode()
//

static FILE *gOut;                      // output unit used WriteGIF and PutByte
static XImage *gXimage = 0;             // image used in WriteGIF and GetPixel

extern "C" {
   int GIFquantize(UInt_t width, UInt_t height, Int_t *ncol, Byte_t *red, Byte_t *green,
                   Byte_t *blue, Byte_t *outputBuf, Byte_t *outputCmap);
   long GIFencode(int Width, int Height, Int_t Ncol, Byte_t R[], Byte_t G[], Byte_t B[], Byte_t ScLine[],
                  void (*get_scline) (int, int, Byte_t *), void (*pb)(Byte_t));
   int GIFdecode(Byte_t *gifArr, Byte_t *pixArr, int *Width, int *Height, int *Ncols, Byte_t *R, Byte_t *G, Byte_t *B);
   int GIFinfo(Byte_t *gifArr, int *Width, int *Height, int *Ncols);
}

//______________________________________________________________________________
static void GetPixel(int y, int width, Byte_t *scline)
{
   // Get pixels in line y and put in array scline.

   for (int i = 0; i < width; i++)
      scline[i] = Byte_t(XGetPixel(gXimage, i, y));
}

//______________________________________________________________________________
static void PutByte(Byte_t b)
{
   // Put byte b in output stream.

   if (ferror(gOut) == 0) fputc(b, gOut);
}

//______________________________________________________________________________
void TGX11::ImgPickPalette(XImage *image, Int_t &ncol, Int_t *&R, Int_t *&G, Int_t *&B)
{
   // Returns in R G B the ncol colors of the palette used by the image.
   // The image pixels are changed to index values in these R G B arrays.
   // This produces a colormap with only the used colors (so even on displays
   // with more than 8 planes we will be able to create GIF's when the image
   // contains no more than 256 different colors). If it does contain more
   // colors we will have to use GIFquantize to reduce the number of colors.
   // The R G B arrays must be deleted by the caller.

   ULong_t *orgcolors = 0;
   Int_t    maxcolors = 0, ncolors;

   // collect different image colors
   int x, y;
   for (x = 0; x < (int) gCws->fWidth; x++) {
      for (y = 0; y < (int) gCws->fHeight; y++) {
         ULong_t pixel = XGetPixel(image, x, y);
         CollectImageColors(pixel, orgcolors, ncolors, maxcolors);
      }
   }

   // get RGB values belonging to pixels
   XColor *xcol = new XColor[ncolors];

   int i;
   for (i = 0; i < ncolors; i++) {
      xcol[i].pixel = orgcolors[i];
      xcol[i].red   = xcol[i].green = xcol[i].blue = 0;
      xcol[i].flags = DoRed | DoGreen | DoBlue;
   }
   QueryColors(fColormap, xcol, ncolors);

   // create RGB arrays and store RGB's for each color and set number of colors
   // (space must be delete by caller)
   R = new Int_t[ncolors];
   G = new Int_t[ncolors];
   B = new Int_t[ncolors];

   for (i = 0; i < ncolors; i++) {
      R[i] = xcol[i].red;
      G[i] = xcol[i].green;
      B[i] = xcol[i].blue;
   }
   ncol = ncolors;

   // update image with indices (pixels) into the new RGB colormap
   for (x = 0; x < (int) gCws->fWidth; x++) {
      for (y = 0; y < (int) gCws->fHeight; y++) {
         ULong_t pixel = XGetPixel(image, x, y);
         Int_t idx = FindColor(pixel, orgcolors, ncolors);
         XPutPixel(image, x, y, idx);
      }
   }

   // cleanup
   delete [] xcol;
   ::operator delete(orgcolors);
}

//______________________________________________________________________________
Int_t TGX11::WriteGIF(char *name)
{
   // Writes the current window into GIF file. Returns 1 in case of success,
   // 0 otherwise.

   Byte_t    scline[2000], r[256], b[256], g[256];
   Int_t    *red, *green, *blue;
   Int_t     ncol, maxcol, i;

   if (gXimage) {
      XDestroyImage(gXimage);
      gXimage = 0;
   }

   gXimage = XGetImage(fDisplay, gCws->fDrawing, 0, 0,
                       gCws->fWidth, gCws->fHeight,
                       AllPlanes, ZPixmap);

   ImgPickPalette(gXimage, ncol, red, green, blue);

   if (ncol > 256) {
      //GIFquantize(...);
      Error("WriteGIF", "can not create GIF of image containing more than 256 colors");
      delete [] red;
      delete [] green;
      delete [] blue;
      return 0;
   }

   maxcol = 0;
   for (i = 0; i < ncol; i++) {
      if (maxcol < red[i] )   maxcol = red[i];
      if (maxcol < green[i] ) maxcol = green[i];
      if (maxcol < blue[i] )  maxcol = blue[i];
      r[i] = 0;
      g[i] = 0;
      b[i] = 0;
   }
   if (maxcol != 0) {
      for (i = 0; i < ncol; i++) {
         r[i] = red[i] * 255/maxcol;
         g[i] = green[i] * 255/maxcol;
         b[i] = blue[i] * 255/maxcol;
      }
   }

   gOut = fopen(name, "w+");

   if (gOut) {
      GIFencode(gCws->fWidth, gCws->fHeight,
             ncol, r, g, b, scline, ::GetPixel, PutByte);
      fclose(gOut);
      i = 1;
   } else {
      Error("WriteGIF","cannot write file: %s",name);
      i = 0;
   }
   delete [] red;
   delete [] green;
   delete [] blue;
   return i;
}

//______________________________________________________________________________
void TGX11::PutImage(int offset,int itran,int x0,int y0,int nx,int ny,int xmin,
                     int ymin,int xmax,int ymax, unsigned char *image,Drawable_t wid)
{
   // Draw image.

   const int maxSegment = 20;
   int           i, n, x, y, xcur, x1, x2, y1, y2;
   unsigned char *jimg, *jbase, icol;
   int           nlines[256];
   XSegment      lines[256][maxSegment];
   Drawable_t    id;

   if (wid) {
      id = wid;
   } else {
      id = gCws->fDrawing;
   }

   for (i = 0; i < 256; i++) nlines[i] = 0;

   x1 = x0 + xmin; y1 = y0 + ny - ymax - 1;
   x2 = x0 + xmax; y2 = y0 + ny - ymin - 1;
   jbase = image + (ymin-1)*nx + xmin;

   for (y = y2; y >= y1; y--) {
      xcur = x1; jbase += nx;
      for (jimg = jbase, icol = *jimg++, x = x1+1; x <= x2; jimg++, x++) {
         if (icol != *jimg) {
            if (icol != itran) {
               n = nlines[icol]++;
               lines[icol][n].x1 = xcur; lines[icol][n].y1 = y;
               lines[icol][n].x2 = x-1;  lines[icol][n].y2 = y;
               if (nlines[icol] == maxSegment) {
                  SetColor(*gGCline,(int)icol+offset);
                  XDrawSegments(fDisplay,id,*gGCline,&lines[icol][0],
                                maxSegment);
                  nlines[icol] = 0;
               }
            }
            icol = *jimg; xcur = x;
         }
      }
      if (icol != itran) {
         n = nlines[icol]++;
         lines[icol][n].x1 = xcur; lines[icol][n].y1 = y;
         lines[icol][n].x2 = x-1;  lines[icol][n].y2 = y;
         if (nlines[icol] == maxSegment) {
            SetColor(*gGCline,(int)icol+offset);
            XDrawSegments(fDisplay,id,*gGCline,&lines[icol][0],
                          maxSegment);
            nlines[icol] = 0;
         }
      }
   }

   for (i = 0; i < 256; i++) {
      if (nlines[i] != 0) {
         SetColor(*gGCline,i+offset);
         XDrawSegments(fDisplay,id,*gGCline,&lines[i][0],nlines[i]);
      }
   }
}

//______________________________________________________________________________
Pixmap_t TGX11::ReadGIF(int x0, int y0, const char *file, Window_t id)
{
   // If id is NULL - loads the specified gif file at position [x0,y0] in the
   // current window. Otherwise creates pixmap from gif file

   FILE  *fd;
   Seek_t filesize;
   unsigned char *gifArr, *pixArr, red[256], green[256], blue[256], *j1, *j2, icol;
   int   i, j, k, width, height, ncolor, irep, offset;
   float rr, gg, bb;
   Pixmap_t pic = 0;

   fd = fopen(file, "r");
   if (!fd) {
      Error("ReadGIF", "unable to open GIF file");
      return pic;
   }

   fseek(fd, 0L, 2);
   filesize = Seek_t(ftell(fd));
   fseek(fd, 0L, 0);

   if (!(gifArr = (unsigned char *) calloc(filesize+256,1))) {
      Error("ReadGIF", "unable to allocate array for gif");
      fclose(fd);
      return pic;
   }

   if (fread(gifArr, filesize, 1, fd) != 1) {
      Error("ReadGIF", "GIF file read failed");
      free(gifArr);
      fclose(fd);
      return pic;
   }
   fclose(fd);

   irep = GIFinfo(gifArr, &width, &height, &ncolor);
   if (irep != 0) {
      free(gifArr);
      return pic;
   }

   if (!(pixArr = (unsigned char *) calloc((width*height),1))) {
      Error("ReadGIF", "unable to allocate array for image");
      free(gifArr);
      return pic;
   }

   irep = GIFdecode(gifArr, pixArr, &width, &height, &ncolor, red, green, blue);
   if (irep != 0) {
      free(gifArr);
      free(pixArr);
      return pic;
   }

   // S E T   P A L E T T E

   offset = 8;

   for (i = 0; i < ncolor; i++) {
      rr = red[i]/255.;
      gg = green[i]/255.;
      bb = blue[i]/255.;
      j = i+offset;
      SetRGB(j,rr,gg,bb);
   }

   // O U T P U T   I M A G E

   for (i = 1; i <= height/2; i++) {
      j1 = pixArr + (i-1)*width;
      j2 = pixArr + (height-i)*width;
      for (k = 0; k < width; k++) {
         icol = *j1; *j1++ = *j2; *j2++ = icol;
      }
   }
   if (id) pic = CreatePixmap(id, width, height);
   PutImage(offset,-1,x0,y0,width,height,0,0,width-1,height-1,pixArr,pic);

   free(gifArr);
   free(pixArr);

   if (pic)
      return pic;
   else if (gCws->fDrawing)
      return (Pixmap_t)gCws->fDrawing;
   return 0;
}

//______________________________________________________________________________
unsigned char *TGX11::GetColorBits(Drawable_t /*wid*/, Int_t /*x*/, Int_t /*y*/, 
                                       UInt_t /*w*/, UInt_t /*h*/)
{
   // Returns an array of pixels created from a part of drawable (defined by x, y, w, h) 
   // in format:
   // b1, g1, r1, 0,  b2, g2, r2, 0 ... bn, gn, rn, 0 ..
   //
   // Pixels are numbered from left to right and from top to bottom.
   // By default all pixels from the whole drawable are returned.
   //
   // Note that return array is 32-bit aligned

   return 0;
}

//______________________________________________________________________________
Pixmap_t TGX11::CreatePixmapFromData(unsigned char * /*bits*/, UInt_t /*width*/, 
                                       UInt_t /*height*/)
{
   // create pixmap from RGB data. RGB data is in format :
   // b1, g1, r1, 0,  b2, g2, r2, 0 ... bn, gn, rn, 0 ..
   //
   // Pixels are numbered from left to right and from top to bottom.
   // Note that data must be 32-bit aligned

   return (Pixmap_t)0;
}

//______________________________________________________________________________
Int_t TGX11::AddPixmap(ULong_t pixid, UInt_t w, UInt_t h)
{
   // Register pixmap created by gVirtualGL
   // w,h : Width and height of the pixmap.
   //register new pixmap
   Int_t wid = 0;

   // Select next free window number
   for (; wid < fMaxNumberOfWindows; ++wid) 
      if (!fWindows[wid].fOpen)
         break;
      
   if (wid == fMaxNumberOfWindows) {
      Int_t newsize = fMaxNumberOfWindows + 10;
      fWindows = (XWindow_t*) TStorage::ReAlloc(
                                                fWindows, newsize * sizeof(XWindow_t),
                                                fMaxNumberOfWindows*sizeof(XWindow_t)
                                               );
                                                  
      for (Int_t i = fMaxNumberOfWindows; i < newsize; ++i)
         fWindows[i].fOpen = 0;
         
      fMaxNumberOfWindows = newsize;
   }
      
   fWindows[wid].fOpen = 1;
   gCws = fWindows + wid;
   gCws->fWindow = pixid;
   gCws->fDrawing = gCws->fWindow;
   gCws->fBuffer = 0;
   gCws->fDoubleBuffer = 0;
   gCws->fIsPixmap = 1;
   gCws->fClip = 0;
   gCws->fWidth = w;
   gCws->fHeight = h;
   gCws->fNewColors = 0;
   gCws->fShared = kFALSE;
      
   return wid;
}