//
// "$Id$"
//
// X specific code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2018 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//

#if !defined(FL_DOXYGEN)

#  define CONSOLIDATE_MOTION 1
/**** Define this if your keyboard lacks a backspace key... ****/
/* #define BACKSPACE_HACK 1 */

#  include <config.h>
#  include <FL/Fl.H>
#  include <FL/platform.H>
#  include "Fl_Window_Driver.H"
#  include <FL/Fl_Window.H>
#  include <FL/fl_utf8.h>
#  include <FL/Fl_Tooltip.H>
#  include <FL/fl_draw.H>
#  include <FL/Fl_Paged_Device.H>
#  include <FL/Fl_Shared_Image.H>
#  include <FL/fl_ask.H>
#  include <FL/filename.H>
#  include <stdio.h>
#  include <stdlib.h>
#  include "flstring.h"
#  include "drivers/X11/Fl_X11_Screen_Driver.H"
#  include "drivers/X11/Fl_X11_Window_Driver.H"
#  include "drivers/X11/Fl_X11_System_Driver.H"
#  include "drivers/Xlib/Fl_Xlib_Graphics_Driver.H"
#  include <unistd.h>
#  include <time.h>
#  include <sys/time.h>
#  include <math.h>
#  include <X11/Xmd.h>
#  include <X11/Xlocale.h>
#  include <X11/Xlib.h>
#  include <X11/keysym.h>
#  include "Xutf8.h"
#define USE_XRANDR (HAVE_DLSYM && HAVE_DLFCN_H) // means attempt to dynamically load libXrandr.so
#if USE_XRANDR
#include <dlfcn.h>
#define RRScreenChangeNotifyMask  (1L << 0) // from X11/extensions/Xrandr.h
#define RRScreenChangeNotify	0           // from X11/extensions/Xrandr.h
typedef int (*XRRUpdateConfiguration_type)(XEvent *event);
static XRRUpdateConfiguration_type XRRUpdateConfiguration_f;
static int randrEventBase;                  // base of RandR-defined events
#endif

#  if HAVE_XFIXES
#  include <X11/extensions/Xfixes.h>
static int xfixes_event_base = 0;
static bool have_xfixes = false;
#  endif

#  include <X11/cursorfont.h>

#  if HAVE_XCURSOR
#    include <X11/Xcursor/Xcursor.h>
#  endif
#  if HAVE_XRENDER
#    include <X11/extensions/Xrender.h>
#  endif

extern Fl_Widget *fl_selection_requestor;

////////////////////////////////////////////////////////////////
// interface to poll/select call:

#  if USE_POLL

#    include <poll.h>
static pollfd *pollfds = 0;

#  else
#    if HAVE_SYS_SELECT_H
#      include <sys/select.h>
#    endif /* HAVE_SYS_SELECT_H */

// The following #define is only needed for HP-UX 9.x and earlier:
//#define select(a,b,c,d,e) select((a),(int *)(b),(int *)(c),(int *)(d),(e))

static fd_set fdsets[3];
static int maxfd;
#    define POLLIN 1
#    define POLLOUT 4
#    define POLLERR 8

#  endif /* USE_POLL */

static int nfds = 0;
static int fd_array_size = 0;
struct FD {
#  if !USE_POLL
  int fd;
  short events;
#  endif
  void (*cb)(int, void*);
  void* arg;
};

static FD *fd = 0;

void Fl_X11_System_Driver::add_fd(int n, int events, void (*cb)(int, void*), void *v) {
  remove_fd(n,events);
  int i = nfds++;
  if (i >= fd_array_size) {
    FD *temp;
    fd_array_size = 2*fd_array_size+1;

    if (!fd) temp = (FD*)malloc(fd_array_size*sizeof(FD));
    else temp = (FD*)realloc(fd, fd_array_size*sizeof(FD));

    if (!temp) return;
    fd = temp;

#  if USE_POLL
    pollfd *tpoll;

    if (!pollfds) tpoll = (pollfd*)malloc(fd_array_size*sizeof(pollfd));
    else tpoll = (pollfd*)realloc(pollfds, fd_array_size*sizeof(pollfd));

    if (!tpoll) return;
    pollfds = tpoll;
#  endif
  }
  fd[i].cb = cb;
  fd[i].arg = v;
#  if USE_POLL
  pollfds[i].fd = n;
  pollfds[i].events = events;
#  else
  fd[i].fd = n;
  fd[i].events = events;
  if (events & POLLIN) FD_SET(n, &fdsets[0]);
  if (events & POLLOUT) FD_SET(n, &fdsets[1]);
  if (events & POLLERR) FD_SET(n, &fdsets[2]);
  if (n > maxfd) maxfd = n;
#  endif
}

void Fl_X11_System_Driver::add_fd(int n, void (*cb)(int, void*), void* v) {
  add_fd(n, POLLIN, cb, v);
}

void Fl_X11_System_Driver::remove_fd(int n, int events) {
  int i,j;
# if !USE_POLL
  maxfd = -1; // recalculate maxfd on the fly
# endif
  for (i=j=0; i<nfds; i++) {
#  if USE_POLL
    if (pollfds[i].fd == n) {
      int e = pollfds[i].events & ~events;
      if (!e) continue; // if no events left, delete this fd
      pollfds[j].events = e;
    }
#  else
    if (fd[i].fd == n) {
      int e = fd[i].events & ~events;
      if (!e) continue; // if no events left, delete this fd
      fd[i].events = e;
    }
    if (fd[i].fd > maxfd) maxfd = fd[i].fd;
#  endif
    // move it down in the array if necessary:
    if (j<i) {
      fd[j] = fd[i];
#  if USE_POLL
      pollfds[j] = pollfds[i];
#  endif
    }
    j++;
  }
  nfds = j;
#  if !USE_POLL
  if (events & POLLIN) FD_CLR(n, &fdsets[0]);
  if (events & POLLOUT) FD_CLR(n, &fdsets[1]);
  if (events & POLLERR) FD_CLR(n, &fdsets[2]);
#  endif
}

void Fl_X11_System_Driver::remove_fd(int n) {
  remove_fd(n, -1);
}

extern int fl_send_system_handlers(void *e);

#if CONSOLIDATE_MOTION
static Fl_Window* send_motion;
extern Fl_Window* fl_xmousewin;
#endif
static bool in_a_window; // true if in any of our windows, even destroyed ones
static void do_queued_events() {
  in_a_window = true;
  while (XEventsQueued(fl_display,QueuedAfterReading)) {
    XEvent xevent;
    XNextEvent(fl_display, &xevent);
    if (fl_send_system_handlers(&xevent))
      continue;
    fl_handle(xevent);
  }
  // we send FL_LEAVE only if the mouse did not enter some other window:
  if (!in_a_window) Fl::handle(FL_LEAVE, 0);
#if CONSOLIDATE_MOTION
  else if (send_motion == fl_xmousewin) {
    send_motion = 0;
    Fl::handle(FL_MOVE, fl_xmousewin);
  }
#endif
}

// these pointers are set by the Fl::lock() function:
static void nothing() {}
void (*fl_lock_function)() = nothing;
void (*fl_unlock_function)() = nothing;

// This is never called with time_to_wait < 0.0:
// It should return negative on error, 0 if nothing happens before
// timeout, and >0 if any callbacks were done.
int Fl_X11_Screen_Driver::poll_or_select_with_delay(double time_to_wait) {

  // OpenGL and other broken libraries call XEventsQueued
  // unnecessarily and thus cause the file descriptor to not be ready,
  // so we must check for already-read events:
  if (fl_display && XQLength(fl_display)) {do_queued_events(); return 1;}

#  if !USE_POLL
  fd_set fdt[3];
  fdt[0] = fdsets[0];
  fdt[1] = fdsets[1];
  fdt[2] = fdsets[2];
#  endif
  int n;

  fl_unlock_function();

  if (time_to_wait < 2147483.648) {
#  if USE_POLL
    n = ::poll(pollfds, nfds, int(time_to_wait*1000 + .5));
#  else
    timeval t;
    t.tv_sec = int(time_to_wait);
    t.tv_usec = int(1000000 * (time_to_wait-t.tv_sec));
    n = ::select(maxfd+1,&fdt[0],&fdt[1],&fdt[2],&t);
#  endif
  } else {
#  if USE_POLL
    n = ::poll(pollfds, nfds, -1);
#  else
    n = ::select(maxfd+1,&fdt[0],&fdt[1],&fdt[2],0);
#  endif
  }

  fl_lock_function();

  if (n > 0) {
    for (int i=0; i<nfds; i++) {
#  if USE_POLL
      if (pollfds[i].revents) fd[i].cb(pollfds[i].fd, fd[i].arg);
#  else
      int f = fd[i].fd;
      short revents = 0;
      if (FD_ISSET(f,&fdt[0])) revents |= POLLIN;
      if (FD_ISSET(f,&fdt[1])) revents |= POLLOUT;
      if (FD_ISSET(f,&fdt[2])) revents |= POLLERR;
      if (fd[i].events & revents) fd[i].cb(f, fd[i].arg);
#  endif
    }
  }
  return n;
}

// just like Fl_X11_Screen_Driver::poll_or_select_with_delay(0.0) except no callbacks are done:
int Fl_X11_Screen_Driver::poll_or_select() {
  if (XQLength(fl_display)) return 1;
  if (!nfds) return 0; // nothing to select or poll
#  if USE_POLL
  return ::poll(pollfds, nfds, 0);
#  else
  timeval t;
  t.tv_sec = 0;
  t.tv_usec = 0;
  fd_set fdt[3];
  fdt[0] = fdsets[0];
  fdt[1] = fdsets[1];
  fdt[2] = fdsets[2];
  return ::select(maxfd+1,&fdt[0],&fdt[1],&fdt[2],&t);
#  endif
}

// replace \r\n by \n
static void convert_crlf(unsigned char *string, long& len) {
  unsigned char *a, *b;
  a = b = string;
  while (*a) {
    if (*a == '\r' && a[1] == '\n') { a++; len--; }
    else *b++ = *a++;
  }
  *b = 0;
}

////////////////////////////////////////////////////////////////

Display *fl_display;
Window fl_message_window = 0;
int fl_screen;
XVisualInfo *fl_visual;
Colormap fl_colormap;
static XIM fl_xim_im = 0;
XIC fl_xim_ic = 0;
Window fl_xim_win = 0;
char fl_is_over_the_spot = 0;
static XRectangle status_area;

static Atom WM_DELETE_WINDOW;
static Atom WM_PROTOCOLS;
static Atom fl_MOTIF_WM_HINTS;
static Atom TARGETS;
static Atom CLIPBOARD;
static Atom TIMESTAMP;
static Atom PRIMARY_TIMESTAMP;
static Atom CLIPBOARD_TIMESTAMP;
Atom fl_XdndAware;
Atom fl_XdndSelection;
Atom fl_XdndEnter;
Atom fl_XdndTypeList;
Atom fl_XdndPosition;
Atom fl_XdndLeave;
Atom fl_XdndDrop;
Atom fl_XdndStatus;
Atom fl_XdndActionCopy;
Atom fl_XdndFinished;
//Atom fl_XdndProxy;
Atom fl_XdndURIList;
static Atom fl_Xatextplainutf;
static Atom fl_Xatextplainutf2;		// STR#2930 
static Atom fl_Xatextplain;
static Atom fl_XaText;
static Atom fl_XaCompoundText;
Atom fl_XaUtf8String;
static Atom fl_XaTextUriList;
static Atom fl_XaImageBmp;
static Atom fl_XaImagePNG;
static Atom fl_INCR;
static Atom fl_NET_WM_PID;
static Atom fl_NET_WM_NAME;			// utf8 aware window label
static Atom fl_NET_WM_ICON_NAME;		// utf8 aware window icon name
static Atom fl_NET_SUPPORTING_WM_CHECK;
static Atom fl_NET_WM_STATE;
static Atom fl_NET_WM_STATE_FULLSCREEN;
static Atom fl_NET_WM_FULLSCREEN_MONITORS;
Atom fl_NET_WORKAREA;
static Atom fl_NET_WM_ICON;
static Atom fl_NET_ACTIVE_WINDOW;

/*
  X defines 32-bit-entities to have a format value of max. 32,
  although sizeof(atom) can be 8 (64 bits) on a 64-bit OS.
  See also fl_open_display() for sizeof(atom) < 4.
  Used for XChangeProperty (see STR #2419).
*/
static int atom_bits = 32;

static void fd_callback(int,void *) {
  do_queued_events();
}

extern "C" {
  static int io_error_handler(Display*) {
    Fl::fatal("X I/O error");
    return 0;
  }

  static int xerror_handler(Display* d, XErrorEvent* e) {
    char buf1[128], buf2[128];
    sprintf(buf1, "XRequest.%d", e->request_code);
    XGetErrorDatabaseText(d,"",buf1,buf1,buf2,128);
    XGetErrorText(d, e->error_code, buf1, 128);
    Fl::warning("%s: %s 0x%lx", buf2, buf1, e->resourceid);
    return 0;
  }
}

extern char *fl_get_font_xfld(int fnum, int size);

static void fl_new_ic()
{
  XVaNestedList preedit_attr = NULL;
  XVaNestedList status_attr = NULL;
  static XFontSet fs = NULL;
  char *fnt;
  char **missing_list = 0;
  int missing_count = 0;
  char *def_string;
  static XRectangle spot;
  int predit = 0;
  int sarea = 0;
  XIMStyles* xim_styles = NULL;

#if USE_XFT

#if defined(__GNUC__)
// FIXME: warning XFT support here
#endif /*__GNUC__*/

  if (!fs) {
    fnt = (char*)"-misc-fixed-*";
    fs = XCreateFontSet(fl_display, fnt, &missing_list,
                        &missing_count, &def_string);
  }
#else
  if (!fs) {
    bool must_free_fnt = true;
    fnt = fl_get_font_xfld(0, 14);
    if (!fnt) {fnt = (char*)"-misc-fixed-*";must_free_fnt=false;}
    fs = XCreateFontSet(fl_display, fnt, &missing_list,
                        &missing_count, &def_string);
    if (must_free_fnt) free(fnt);
  }
#endif

  if (missing_list) XFreeStringList(missing_list);

  preedit_attr = XVaCreateNestedList(0,
                                     XNSpotLocation, &spot,
                                     XNFontSet, fs, NULL);
  status_attr = XVaCreateNestedList(0,
                                    XNAreaNeeded, &status_area,
                                    XNFontSet, fs, NULL);

  if (!XGetIMValues(fl_xim_im, XNQueryInputStyle,
                    &xim_styles, NULL, NULL)) {
    int i;
    XIMStyle *style;
    for (i = 0, style = xim_styles->supported_styles;
         i < xim_styles->count_styles; i++, style++) {
      if (*style == (XIMPreeditPosition | XIMStatusArea)) {
        sarea = 1;
        predit = 1;
      } else if (*style == (XIMPreeditPosition | XIMStatusNothing)) {
        predit = 1;
      }
    }
  }
  XFree(xim_styles);

  if (sarea) {
    fl_xim_ic = XCreateIC(fl_xim_im,
                          XNInputStyle, (XIMPreeditPosition | XIMStatusArea),
                          XNPreeditAttributes, preedit_attr,
                          XNStatusAttributes, status_attr,
                          NULL);
  }

  if (!fl_xim_ic && predit) {
    fl_xim_ic = XCreateIC(fl_xim_im,
                          XNInputStyle, (XIMPreeditPosition | XIMStatusNothing),
                          XNPreeditAttributes, preedit_attr,
                          NULL);
  }
  XFree(preedit_attr);
  XFree(status_attr);
  if (!fl_xim_ic) {
    fl_is_over_the_spot = 0;
    fl_xim_ic = XCreateIC(fl_xim_im,
                          XNInputStyle, (XIMPreeditNothing | XIMStatusNothing),
                          NULL);
  } else {
    fl_is_over_the_spot = 1;
    XVaNestedList status_attr = NULL;
    status_attr = XVaCreateNestedList(0, XNAreaNeeded, &status_area, NULL);

    XGetICValues(fl_xim_ic, XNStatusAttributes, status_attr, NULL);
    XFree(status_attr);
  }
}


void fl_set_status(int x, int y, int w, int h)
{
  XVaNestedList status_attr;
  status_area.x = x;
  status_area.y = y;
  status_area.width = w;
  status_area.height = h;
  if (!fl_xim_ic) return;
  status_attr = XVaCreateNestedList(0, XNArea, &status_area, NULL);

  XSetICValues(fl_xim_ic, XNStatusAttributes, status_attr, NULL);
  XFree(status_attr);
}

static void fl_init_xim() {
  static int xim_warning = 2;
  if (xim_warning > 0) xim_warning--;

  //XIMStyle *style;
  XIMStyles *xim_styles;
  if (!fl_display) return;
  if (fl_xim_im) return;

  fl_xim_im = XOpenIM(fl_display, NULL, NULL, NULL);
  xim_styles = NULL;
  fl_xim_ic = NULL;

  if (fl_xim_im) {
    XGetIMValues (fl_xim_im, XNQueryInputStyle,
                  &xim_styles, NULL, NULL);
  } else {
    if (xim_warning)
      Fl::warning("XOpenIM() failed");
    // if xim_styles is allocated, free it now
    if (xim_styles) XFree(xim_styles);
    return;
  }

  if (xim_styles && xim_styles->count_styles) {
    fl_new_ic();
   } else {
     if (xim_warning)
       Fl::warning("No XIM style found");
     XCloseIM(fl_xim_im);
     fl_xim_im = NULL;
     // if xim_styles is allocated, free it now
     if (xim_styles) XFree(xim_styles);
     return;
  }
  if (!fl_xim_ic) {
    if (xim_warning)
      Fl::warning("XCreateIC() failed");
    XCloseIM(fl_xim_im);
    fl_xim_im = NULL;
  }
  // if xim_styles is still allocated, free it now
  if(xim_styles) XFree(xim_styles);
}

void fl_xim_deactivate(void);

extern XRectangle fl_spot;
extern int fl_spotf;
extern int fl_spots;

void fl_xim_activate(Window xid) {
  if (!fl_xim_im)
    return;

  // If the focused window has changed, then use the brute force method
  // of completely recreating the input context.
  if (fl_xim_win != xid) {
    fl_xim_deactivate();

    fl_new_ic();
    fl_xim_win = xid;

    XSetICValues(fl_xim_ic,
                 XNFocusWindow, fl_xim_win,
                 XNClientWindow, fl_xim_win,
                 NULL);
  }

  fl_set_spot(fl_spotf, fl_spots, fl_spot.x, fl_spot.y, fl_spot.width, fl_spot.height);
}

void fl_xim_deactivate(void) {
  if (!fl_xim_ic)
    return;

  XDestroyIC(fl_xim_ic);
  fl_xim_ic = NULL;

  fl_xim_win = 0;
}

void Fl_X11_Screen_Driver::enable_im() {
  Fl_Window *win;

  win = Fl::first_window();
  if (win && win->shown()) {
    fl_xim_activate(fl_xid(win));
    XSetICFocus(fl_xim_ic);
  } else {
    fl_new_ic();
  }
}

void Fl_X11_Screen_Driver::disable_im() {
  fl_xim_deactivate();
}

void Fl_X11_Screen_Driver::open_display_platform() {
  if (fl_display) return;

  setlocale(LC_CTYPE, "");
  XSetLocaleModifiers("@im=");

  XSetIOErrorHandler(io_error_handler);
  XSetErrorHandler(xerror_handler);

  Display *d = XOpenDisplay(0);
  if (!d) Fl::fatal("Can't open display: %s",XDisplayName(0));

  fl_open_display(d);
  // the unique GC used by all X windows
  GC gc = XCreateGC(fl_display, RootWindow(fl_display, fl_screen), 0, 0);
  Fl_Graphics_Driver::default_driver().gc(gc);
}


void fl_open_display(Display* d) {
  fl_display = d;

  WM_DELETE_WINDOW      = XInternAtom(d, "WM_DELETE_WINDOW",    0);
  WM_PROTOCOLS          = XInternAtom(d, "WM_PROTOCOLS",        0);
  fl_MOTIF_WM_HINTS     = XInternAtom(d, "_MOTIF_WM_HINTS",     0);
  TARGETS               = XInternAtom(d, "TARGETS",             0);
  CLIPBOARD             = XInternAtom(d, "CLIPBOARD",           0);
  TIMESTAMP             = XInternAtom(d, "TIMESTAMP",           0);
  PRIMARY_TIMESTAMP     = XInternAtom(d, "PRIMARY_TIMESTAMP",   0);
  CLIPBOARD_TIMESTAMP   = XInternAtom(d, "CLIPBOARD_TIMESTAMP", 0);
  fl_XdndAware          = XInternAtom(d, "XdndAware",           0);
  fl_XdndSelection      = XInternAtom(d, "XdndSelection",       0);
  fl_XdndEnter          = XInternAtom(d, "XdndEnter",           0);
  fl_XdndTypeList       = XInternAtom(d, "XdndTypeList",        0);
  fl_XdndPosition       = XInternAtom(d, "XdndPosition",        0);
  fl_XdndLeave          = XInternAtom(d, "XdndLeave",           0);
  fl_XdndDrop           = XInternAtom(d, "XdndDrop",            0);
  fl_XdndStatus         = XInternAtom(d, "XdndStatus",          0);
  fl_XdndActionCopy     = XInternAtom(d, "XdndActionCopy",      0);
  fl_XdndFinished       = XInternAtom(d, "XdndFinished",        0);
  //fl_XdndProxy        = XInternAtom(d, "XdndProxy",           0);
  fl_XdndEnter          = XInternAtom(d, "XdndEnter",           0);
  fl_XdndURIList        = XInternAtom(d, "text/uri-list",       0);
  fl_Xatextplainutf     = XInternAtom(d, "text/plain;charset=UTF-8",0);
  fl_Xatextplainutf2    = XInternAtom(d, "text/plain;charset=utf-8",0);	// Firefox/Thunderbird needs this - See STR#2930
  fl_Xatextplain        = XInternAtom(d, "text/plain",          0);
  fl_XaText             = XInternAtom(d, "TEXT",                0);
  fl_XaCompoundText     = XInternAtom(d, "COMPOUND_TEXT",       0);
  fl_XaUtf8String       = XInternAtom(d, "UTF8_STRING",         0);
  fl_XaTextUriList      = XInternAtom(d, "text/uri-list",       0);
  fl_XaImageBmp         = XInternAtom(d, "image/bmp",           0);
  fl_XaImagePNG         = XInternAtom(d, "image/png",           0);
  fl_INCR               = XInternAtom(d, "INCR",                0);
  fl_NET_WM_PID         = XInternAtom(d, "_NET_WM_PID",         0);
  fl_NET_WM_NAME        = XInternAtom(d, "_NET_WM_NAME",        0);
  fl_NET_WM_ICON_NAME   = XInternAtom(d, "_NET_WM_ICON_NAME",   0);
  fl_NET_SUPPORTING_WM_CHECK = XInternAtom(d, "_NET_SUPPORTING_WM_CHECK", 0);
  fl_NET_WM_STATE       = XInternAtom(d, "_NET_WM_STATE",       0);
  fl_NET_WM_STATE_FULLSCREEN = XInternAtom(d, "_NET_WM_STATE_FULLSCREEN", 0);
  fl_NET_WM_FULLSCREEN_MONITORS = XInternAtom(d, "_NET_WM_FULLSCREEN_MONITORS", 0);
  fl_NET_WORKAREA       = XInternAtom(d, "_NET_WORKAREA",       0);
  fl_NET_WM_ICON        = XInternAtom(d, "_NET_WM_ICON",        0);
  fl_NET_ACTIVE_WINDOW  = XInternAtom(d, "_NET_ACTIVE_WINDOW",  0);

  if (sizeof(Atom) < 4)
    atom_bits = sizeof(Atom) * 8;

  Fl::add_fd(ConnectionNumber(d), POLLIN, fd_callback);

  fl_screen = DefaultScreen(d);

  fl_message_window =
    XCreateSimpleWindow(d, RootWindow(d,fl_screen), 0,0,1,1,0, 0, 0);

// construct an XVisualInfo that matches the default Visual:
  XVisualInfo templt; int num;
  templt.visualid = XVisualIDFromVisual(DefaultVisual(d, fl_screen));
  fl_visual = XGetVisualInfo(d, VisualIDMask, &templt, &num);
  fl_colormap = DefaultColormap(d, fl_screen);
  fl_init_xim();

#if !USE_COLORMAP
  Fl::visual(FL_RGB);
#endif

#if HAVE_XFIXES
  int error_base;
  if (XFixesQueryExtension(fl_display, &xfixes_event_base, &error_base))
    have_xfixes = true;
  else
    have_xfixes = false;
#endif

#if USE_XRANDR
  void *libxrandr_addr = dlopen("libXrandr.so.2", RTLD_LAZY);
  if (!libxrandr_addr)  libxrandr_addr = dlopen("libXrandr.so", RTLD_LAZY);
  if (libxrandr_addr) {
    int error_base;
    typedef Bool (*XRRQueryExtension_type)(Display*, int*, int*);
    typedef void (*XRRSelectInput_type)(Display*, Window, int);
    XRRQueryExtension_type XRRQueryExtension_f = (XRRQueryExtension_type)dlsym(libxrandr_addr, "XRRQueryExtension");
    XRRSelectInput_type XRRSelectInput_f = (XRRSelectInput_type)dlsym(libxrandr_addr, "XRRSelectInput");
    XRRUpdateConfiguration_f = (XRRUpdateConfiguration_type)dlsym(libxrandr_addr, "XRRUpdateConfiguration");
    if (XRRQueryExtension_f && XRRSelectInput_f && XRRQueryExtension_f(d, &randrEventBase, &error_base))
      XRRSelectInput_f(d, RootWindow(d, fl_screen), RRScreenChangeNotifyMask);
    else XRRUpdateConfiguration_f = NULL;
    }
#endif

  // Listen for changes to _NET_WORKAREA
  XSelectInput(d, RootWindow(d, fl_screen), PropertyChangeMask);
}

void Fl_X11_Screen_Driver::close_display() {
  Fl::remove_fd(ConnectionNumber(fl_display));
  XCloseDisplay(fl_display);
}

int Fl_X11_Screen_Driver::get_mouse_unscaled(int &mx, int &my) {
  open_display();
  Window root = RootWindow(fl_display, fl_screen);
  Window c; int cx,cy; unsigned int mask;
  XQueryPointer(fl_display, root, &root, &c, &mx, &my, &cx, &cy, &mask);
#if USE_XFT
  int screen = screen_num_unscaled(mx, my);
  return screen >= 0 ? screen : 0;
#else
  return screen_num(mx, my);
#endif
}


int Fl_X11_Screen_Driver::get_mouse(int &xx, int &yy) {
  int snum = get_mouse_unscaled(xx, yy);
  float s = scale(snum);
  xx = xx/s;
  yy = yy/s;
  return snum;
}

////////////////////////////////////////////////////////////////
// Code used for paste and DnD into the program:

char *fl_selection_buffer[2];
int fl_selection_length[2];
const char * fl_selection_type[2];
int fl_selection_buffer_length[2];
char fl_i_own_selection[2] = {0,0};

// Call this when a "paste" operation happens:
void Fl_X11_System_Driver::paste(Fl_Widget &receiver, int clipboard, const char *type) {
  if (fl_i_own_selection[clipboard]) {
    // We already have it, do it quickly without window server.
    // Notice that the text is clobbered if set_selection is
    // called in response to FL_PASTE!
    // However, for now, we only paste text in this function
    if (fl_selection_type[clipboard] != Fl::clipboard_plain_text) return; //TODO: allow copy/paste of image within same app
    Fl::e_text = fl_selection_buffer[clipboard];
    Fl::e_length = fl_selection_length[clipboard];
    if (!Fl::e_text) Fl::e_text = (char *)"";
    receiver.handle(FL_PASTE);
    return;
  }
  // otherwise get the window server to return it:
  fl_selection_requestor = &receiver;
  Atom property = clipboard ? CLIPBOARD : XA_PRIMARY;
  Fl::e_clipboard_type = type;
  XConvertSelection(fl_display, property, TARGETS, property,
                    fl_xid(Fl::first_window()), fl_event_time);
}

int Fl_X11_System_Driver::clipboard_contains(const char *type)
{
  XEvent event;
  Atom actual; int format; unsigned long count, remaining, i = 0;
  unsigned char* portion = NULL;
  Fl_Window *win = Fl::first_window();
  if (!win || !fl_xid(win)) return 0;
  XConvertSelection(fl_display, CLIPBOARD, TARGETS, CLIPBOARD, fl_xid(win), CurrentTime);
  XFlush(fl_display);
  do  { 
    XNextEvent(fl_display, &event); 
    if (event.type == SelectionNotify && event.xselection.property == None) return 0;
    i++; 
  }
  while (i < 20 && event.type != SelectionNotify);
  if (i >= 20) return 0;
  XGetWindowProperty(fl_display,
		     event.xselection.requestor,
		     event.xselection.property,
		     0, 4000, 0, 0,
		     &actual, &format, &count, &remaining, &portion);
  if (actual != XA_ATOM) return 0;
  Atom t;
  int retval = 0;
  if (strcmp(type, Fl::clipboard_plain_text) == 0) {
    for (i = 0; i<count; i++) { // searching for text data
      t = ((Atom*)portion)[i];
      if (t == fl_Xatextplainutf ||
	  t == fl_Xatextplainutf2 ||
	  t == fl_Xatextplain ||
	  t == fl_XaUtf8String) {
	retval = 1;
	break;
      }
    }	
  }
  else if (strcmp(type, Fl::clipboard_image) == 0) {
    for (i = 0; i<count; i++) { // searching for image data
      t = ((Atom*)portion)[i];
      if (t == fl_XaImageBmp || t == fl_XaImagePNG) {
	retval = 1;
	break;
      }
    }	
  }
  XFree(portion);
  return retval;
}

static Window fl_dnd_source_window;
static Atom *fl_dnd_source_types; // null-terminated list of data types being supplied
static Atom fl_dnd_type;
static Atom fl_dnd_source_action;
static Atom fl_dnd_action;

void fl_sendClientMessage(Window window, Atom message,
                                 unsigned long d0,
                                 unsigned long d1=0,
                                 unsigned long d2=0,
                                 unsigned long d3=0,
                                 unsigned long d4=0)
{
  XEvent e;
  e.xany.type = ClientMessage;
  e.xany.window = window;
  e.xclient.message_type = message;
  e.xclient.format = 32;
  e.xclient.data.l[0] = (long)d0;
  e.xclient.data.l[1] = (long)d1;
  e.xclient.data.l[2] = (long)d2;
  e.xclient.data.l[3] = (long)d3;
  e.xclient.data.l[4] = (long)d4;
  XSendEvent(fl_display, window, 0, 0, &e);
}


/*
   Get window property value (32 bit format)
   Returns zero on success, -1 on error

   'data' should be freed with XFree() using this pattern:

        unsigned long *data = 0;
        if (0 == get_xwinprop(....., &nitems, &data) ) { ..success.. }
        else { ..fail.. }
        if ( data ) { XFree(data); data=0; }
	
    Note: 'data' can be non-zero, even if the return value is -1 (error) and
    should hence be XFree'd *after* the if/else statement, as described above.
*/
static int get_xwinprop(Window wnd, Atom prop, long max_length,
                        unsigned long *nitems, unsigned long **data) {
  Atom actual;
  int format;
  unsigned long bytes_after;
  
  if (Success != XGetWindowProperty(fl_display, wnd, prop, 0, max_length, 
                                    False, AnyPropertyType, &actual, &format, 
                                    nitems, &bytes_after, (unsigned char**)data)) {
    return -1;
  }

  if (actual == None || format != 32) {
    return -1;
  }

  return 0;
}


////////////////////////////////////////////////////////////////
// Code for copying to clipboard and DnD out of the program:

void Fl_X11_System_Driver::copy(const char *stuff, int len, int clipboard, const char *type) {
  if (!stuff || len<0) return;

  if (clipboard >= 2) {
    copy(stuff, len, 0, type);
    copy(stuff, len, 1, type);
    return;
  }

  if (len+1 > fl_selection_buffer_length[clipboard]) {
    delete[] fl_selection_buffer[clipboard];
    fl_selection_buffer[clipboard] = new char[len+100];
    fl_selection_buffer_length[clipboard] = len+100;
  }
  memcpy(fl_selection_buffer[clipboard], stuff, len);
  fl_selection_buffer[clipboard][len] = 0; // needed for direct paste
  fl_selection_length[clipboard] = len;
  fl_i_own_selection[clipboard] = 1;
  fl_selection_type[clipboard] = Fl::clipboard_plain_text;
  Atom property = clipboard ? CLIPBOARD : XA_PRIMARY;
  XSetSelectionOwner(fl_display, property, fl_message_window, fl_event_time);
}

static void write_short(unsigned char **cp,short i){
  unsigned char *c=*cp;
  *c++=i&0xFF;i>>=8;
  *c++=i&0xFF;i>>=8;
  *cp=c;
}

static void write_int(unsigned char **cp,int i){
  unsigned char *c=*cp;
  *c++=i&0xFF;i>>=8;
  *c++=i&0xFF;i>>=8;
  *c++=i&0xFF;i>>=8;
  *c++=i&0xFF;i>>=8;
  *cp=c;
}

static unsigned char *create_bmp(const unsigned char *data, int W, int H, int *return_size){
  int R=(3*W+3)/4 * 4; // the number of bytes per row, rounded up to multiple of 4
  int s=H*R;
  int fs=14+40+s;
  unsigned char *b=new unsigned char[fs];
  unsigned char *c=b;
  // BMP header
  *c++='B';
  *c++='M';
  write_int(&c,fs);
  write_int(&c,0);
  write_int(&c,14+40);
  // DIB header:
  write_int(&c,40);
  write_int(&c,W);
  write_int(&c,H);
  write_short(&c,1);
  write_short(&c,24);//bits ber pixel
  write_int(&c,0);//RGB
  write_int(&c,s);
  write_int(&c,0);// horizontal resolution
  write_int(&c,0);// vertical resolution
  write_int(&c,0);//number of colors. 0 -> 1<<bits_per_pixel
  write_int(&c,0);
  // Pixel data
  data+=3*W*H;
  for (int y=0;y<H;++y){
    data-=3*W;
    const unsigned char *s=data;
    unsigned char *p=c;
    for (int x=0;x<W;++x){
      *p++=s[2];
      *p++=s[1];
      *p++=s[0];
      s+=3;
    }
    c+=R;
  }
  *return_size = fs;
  return b;
}

// takes a raw RGB image and puts it in the copy/paste buffer
void Fl_X11_Screen_Driver::copy_image(const unsigned char *data, int W, int H, int clipboard){
  if (!data || W <= 0 || H <= 0) return;
  delete[] fl_selection_buffer[clipboard];
  fl_selection_buffer[clipboard] = (char *) create_bmp(data,W,H,&fl_selection_length[clipboard]);
  fl_selection_buffer_length[clipboard] = fl_selection_length[clipboard];
  fl_i_own_selection[clipboard] = 1;
  fl_selection_type[clipboard] = Fl::clipboard_image;
  Atom property = clipboard ? CLIPBOARD : XA_PRIMARY;
  XSetSelectionOwner(fl_display, property, fl_message_window, fl_event_time);
}

////////////////////////////////////////////////////////////////
// Code for tracking clipboard changes:

static Time primary_timestamp = (Time)-1;
static Time clipboard_timestamp = (Time)-1;

extern bool fl_clipboard_notify_empty(void);
extern void fl_trigger_clipboard_notify(int source);

static void poll_clipboard_owner(void) {
  Window xid;

#if HAVE_XFIXES
  // No polling needed with Xfixes
  if (have_xfixes)
    return;
#endif

  // No one is interested, so no point polling
  if (fl_clipboard_notify_empty())
    return;

  // We need a window for this to work
  if (!Fl::first_window())
    return;
  xid = fl_xid(Fl::first_window());
  if (!xid)
    return;

  // Request an update of the selection time for both the primary and
  // clipboard selections. Magic continues when we get a SelectionNotify.
  if (!fl_i_own_selection[0])
    XConvertSelection(fl_display, XA_PRIMARY, TIMESTAMP, PRIMARY_TIMESTAMP,
                      xid, fl_event_time);
  if (!fl_i_own_selection[1])
    XConvertSelection(fl_display, CLIPBOARD, TIMESTAMP, CLIPBOARD_TIMESTAMP,
                      xid, fl_event_time);
}

static void clipboard_timeout(void *data)
{
  // No one is interested, so stop polling
  if (fl_clipboard_notify_empty())
    return;

  poll_clipboard_owner();

  Fl::repeat_timeout(0.5, clipboard_timeout);
}

static void handle_clipboard_timestamp(int clipboard, Time time)
{
  Time *timestamp;

  timestamp = clipboard ? &clipboard_timestamp : &primary_timestamp;

#if HAVE_XFIXES
  if (!have_xfixes)
#endif
  {
    // Initial scan, just store the value
    if (*timestamp == (Time)-1) {
      *timestamp = time;
      return;
    }
  }

  // Same selection
  if (time == *timestamp)
    return;

  *timestamp = time;

  // The clipboard change is the event that caused us to request
  // the clipboard data, so use that time as the latest event.
  if (time > fl_event_time)
    fl_event_time = time;

  // Something happened! Let's tell someone!
  fl_trigger_clipboard_notify(clipboard);
}

void Fl_X11_System_Driver::clipboard_notify_change() {
  // Reset the timestamps if we've going idle so that you don't
  // get a bogus immediate trigger next time they're activated.
  if (fl_clipboard_notify_empty()) {
    primary_timestamp = (Time)-1;
    clipboard_timestamp = (Time)-1;
  } else {
#if HAVE_XFIXES
    if (!have_xfixes)
#endif
    {
      poll_clipboard_owner();

      if (!Fl::has_timeout(clipboard_timeout))
        Fl::add_timeout(0.5, clipboard_timeout);
    }
  }
}

////////////////////////////////////////////////////////////////

const XEvent* fl_xevent; // the current x event
ulong fl_event_time; // the last timestamp from an x event

char fl_key_vector[32]; // used by Fl::get_key()

// Record event mouse position and state from an XEvent:

static int px, py;
static ulong ptime;

static void set_event_xy(Fl_Window *win) {
#  if CONSOLIDATE_MOTION
  send_motion = 0;
#  endif
  float s = 1;
#if USE_XFT
  s = Fl::screen_driver()->scale(Fl_Window_Driver::driver(win)->screen_num());
#endif
  Fl::e_x_root  = fl_xevent->xbutton.x_root/s;
  Fl::e_x       = fl_xevent->xbutton.x/s;
  Fl::e_y_root  = fl_xevent->xbutton.y_root/s;
  Fl::e_y       = fl_xevent->xbutton.y/s;
  Fl::e_state   = fl_xevent->xbutton.state << 16;
  fl_event_time = fl_xevent->xbutton.time;
#  ifdef __sgi
  // get the meta key off PC keyboards:
  if (fl_key_vector[18]&0x18) Fl::e_state |= FL_META;
#  endif
  // turn off is_click if enough time or mouse movement has passed:
  if (abs(Fl::e_x_root-px)+abs(Fl::e_y_root-py) > 3 ||
      fl_event_time >= ptime+1000)
    Fl::e_is_click = 0;
}

// if this is same event as last && is_click, increment click count:
static inline void checkdouble() {
  if (Fl::e_is_click == Fl::e_keysym)
    Fl::e_clicks++;
  else {
    Fl::e_clicks = 0;
    Fl::e_is_click = Fl::e_keysym;
  }
  px = Fl::e_x_root;
  py = Fl::e_y_root;
  ptime = fl_event_time;
}

static Fl_Window* resize_bug_fix;

////////////////////////////////////////////////////////////////

static char unknown[] = "<unknown>";
const int unknown_len = 10;

extern "C" {

static int xerror = 0;

static int ignoreXEvents(Display *display, XErrorEvent *event) {
  xerror = 1;
  return 0;
}

static XErrorHandler catchXExceptions() {
  xerror = 0;
  return ignoreXEvents;
}

static int wasXExceptionRaised() {
  return xerror;
}

}

static bool getNextEvent(XEvent *event_return)
{
  time_t t = time(NULL);
  while (!XPending(fl_display))
  {
    if(time(NULL) - t > 10.0)
    {
      // fprintf(stderr,"Error: The XNextEvent never came...\n");
      return false; 
    }
  }
  XNextEvent(fl_display, event_return);
  return true;
}

static long getIncrData(uchar* &data, const XSelectionEvent& selevent, long lower_bound)
{
  // fprintf(stderr,"Incremental transfer starting due to INCR property\n");
  size_t total = 0;
  XEvent event;
  XDeleteProperty(fl_display, selevent.requestor, selevent.property);  
  data = (uchar*)realloc(data, lower_bound);
  for (;;)
  {
    if (!getNextEvent(&event)) break;
    if (event.type == PropertyNotify)
    {
      if (event.xproperty.state != PropertyNewValue) continue;
      Atom actual_type;
      int actual_format;
      unsigned long nitems;
      unsigned long bytes_after;
      unsigned char* prop = 0;
      long offset = 0;
      size_t num_bytes;
      // size_t slice_size = 0;
      do
      {
	XGetWindowProperty(fl_display, selevent.requestor, selevent.property, offset, 70000, True,
			   AnyPropertyType, &actual_type, &actual_format, &nitems, &bytes_after, &prop);
	num_bytes = nitems * (actual_format / 8);
	offset += num_bytes/4;
	// slice_size += num_bytes;
	if (total + num_bytes > (size_t)lower_bound) data = (uchar*)realloc(data, total + num_bytes);
	memcpy(data + total, prop, num_bytes); total += num_bytes;
	if (prop) XFree(prop);
      } while (bytes_after != 0);
      // fprintf(stderr,"INCR data size:%ld\n", slice_size);
      if (num_bytes == 0) break;
    }
    else break;
  }
  XDeleteProperty(fl_display, selevent.requestor, selevent.property);
  return (long)total;
}

/* Internal function to reduce "deprecated" warnings for XKeycodeToKeysym().
   This way we get only one warning. The option to use XkbKeycodeToKeysym()
   instead would not help much - see STR #2913 for more information.
*/
static KeySym fl_KeycodeToKeysym(Display *d, KeyCode k, unsigned i) {
  return XKeycodeToKeysym(d, k, i);
}

#if USE_XRANDR
static void react_to_screen_reconfiguration() {
#if USE_XFT
  // memorize previous screen sizes and scales
  int old_count = Fl::screen_count();
  int (*sizes)[4] =  new int[old_count][4];
  float *scales = new float[old_count];
  for (int screen = 0; screen < old_count; screen++) {
    Fl::screen_xywh(sizes[screen][0], sizes[screen][1], sizes[screen][2], sizes[screen][3], screen);
    scales[screen] = Fl::screen_scale(screen);
  }
#endif // USE_XFT
  Fl::call_screen_init(); // compute new screen sizes
#if USE_XFT
  // detect whether screen sizes were unchanged
  bool nochange = (old_count == Fl::screen_count());
  if (nochange) {
    for (int screen = 0; screen < old_count; screen++) {
      int X,Y,W,H;
      Fl::screen_xywh(X,Y,W,H, screen);
      X /= scales[screen];
      Y /= scales[screen];
      W /= scales[screen];
      H /= scales[screen];
      if (X != sizes[screen][0] || Y != sizes[screen][1] || W != sizes[screen][2] || H != sizes[screen][3]) {
        nochange = false;
        break;
      }
    }
  }
  delete[] sizes;
  if (nochange) { // screen sizes did not change: re-use previous screen scale values
    for (int screen = 0; screen < old_count; screen++)
      Fl::screen_driver()->scale(screen, scales[screen]);
  } else {
    float factor = Fl::screen_driver()->use_startup_scale_factor();
    for (int screen = 0; screen < Fl::screen_count(); screen++)
      Fl::screen_driver()->rescale_all_windows_from_screen(screen, factor);
  }
  delete[] scales;
#endif // USE_XFT
}
#endif // USE_XRANDR


int fl_handle(const XEvent& thisevent)
{
  XEvent xevent = thisevent;
  fl_xevent = &thisevent;
  Window xid = xevent.xany.window;

  if (fl_xim_ic && xevent.type == DestroyNotify &&
        xid != fl_xim_win && !fl_find(xid))
  {
    XIM xim_im;
    xim_im = XOpenIM(fl_display, NULL, NULL, NULL);
    if (!xim_im) {
      /*  XIM server has crashed */
      XSetLocaleModifiers("@im=");
      fl_xim_im = NULL;
      fl_init_xim();
    } else {
      XCloseIM(xim_im);	// see STR 2185 for comment
    }
    return 0;
  }

  if (fl_xim_ic && (xevent.type == FocusIn))
    fl_xim_activate(xid);

  if (fl_xim_ic && XFilterEvent((XEvent *)&xevent, 0))
      return(1);
  
#if USE_XRANDR  
  if( XRRUpdateConfiguration_f && xevent.type == randrEventBase + RRScreenChangeNotify) {
    XRRUpdateConfiguration_f(&xevent);
    react_to_screen_reconfiguration();
    Fl::handle(FL_SCREEN_CONFIGURATION_CHANGED, NULL);
  }
#endif // USE_XRANDR

  if (xevent.type == PropertyNotify && xevent.xproperty.atom == fl_NET_WORKAREA) {
    ((Fl_X11_Screen_Driver*)Fl::screen_driver())->init_workarea();
  }
  
  switch (xevent.type) {

  case KeymapNotify:
    memcpy(fl_key_vector, xevent.xkeymap.key_vector, 32);
    return 0;

  case MappingNotify:
    XRefreshKeyboardMapping((XMappingEvent*)&xevent.xmapping);
    return 0;

  case SelectionNotify: {
    static unsigned char* sn_buffer = 0;
    //static const char *buffer_format = 0;
    if (sn_buffer) {XFree(sn_buffer); sn_buffer = 0;}
    long bytesread = 0;
    if (fl_xevent->xselection.property) for (;;) {
      // The Xdnd code pastes 64K chunks together, possibly to avoid
      // bugs in X servers, or maybe to avoid an extra round-trip to
      // get the property length.  I copy this here:
      Atom actual; int format; unsigned long count, remaining;
      unsigned char* portion = NULL;
      if (XGetWindowProperty(fl_display,
                             fl_xevent->xselection.requestor,
                             fl_xevent->xselection.property,
                             bytesread/4, 65536, 1, AnyPropertyType,
                             &actual, &format, &count, &remaining,
                             &portion)) break; // quit on error

      if ((fl_xevent->xselection.property == PRIMARY_TIMESTAMP) ||
          (fl_xevent->xselection.property == CLIPBOARD_TIMESTAMP)) {
        if (portion && format == 32 && count == 1) {
          Time t = *(unsigned int*)portion;
          if (fl_xevent->xselection.property == CLIPBOARD_TIMESTAMP)
            handle_clipboard_timestamp(1, t);
          else
            handle_clipboard_timestamp(0, t);
        }
	XFree(portion); portion = 0;
        return true;
      }

      if (actual == TARGETS || actual == XA_ATOM) {
	/*for (unsigned i = 0; i<count; i++) {
	    fprintf(stderr," %s", XGetAtomName(fl_display, ((Atom*)portion)[i]) );
	  }
	  fprintf(stderr,"\n");
	*/
	Atom t, type = XA_STRING;
	if (Fl::e_clipboard_type == Fl::clipboard_image) { // searching for image data
	  for (unsigned i = 0; i<count; i++) { 
	    t = ((Atom*)portion)[i];
	    if (t == fl_XaImageBmp || t == fl_XaImagePNG) {
	      type = t;
	      goto found;
	    }
	  }
	  XFree(portion);
	  return true;
	}
	for (unsigned i = 0; i<count; i++) { // searching for text data
	  t = ((Atom*)portion)[i];
	  if (t == fl_Xatextplainutf ||
	      t == fl_Xatextplainutf2 ||
	      t == fl_Xatextplain ||
	      t == fl_XaUtf8String) {
	    type = t;
	    break;
	  }
	  // rest are only used if no UTF-8 available:
	  if (t == fl_XaText ||
	      t == fl_XaTextUriList ||
	      t == fl_XaCompoundText) type = t;
	}
      found:
	XFree(portion); portion = 0;
	Atom property = xevent.xselection.property;
	XConvertSelection(fl_display, property, type, property,
	      fl_xid(Fl::first_window()),
	      fl_event_time);
	if (type == fl_XaImageBmp) {
	  Fl::e_clipboard_type = Fl::clipboard_image;
	  //buffer_format = "image/bmp";
	  }
	else if (type == fl_XaImagePNG) {
	  Fl::e_clipboard_type = Fl::clipboard_image;
	  //buffer_format = "image/png";
	  }
	else {
	  Fl::e_clipboard_type = Fl::clipboard_plain_text;
	  // buffer_format = Fl::clipboard_plain_text;
	  }
	  // fprintf(stderr,"used format=%s\n", buffer_format);
	return true;
      }
	if (actual == fl_INCR) {
	  bytesread = getIncrData(sn_buffer, xevent.xselection, *(long*)portion);
	  XFree(portion);
	  break;
	}
	// Make sure we got something sane...
      if ((portion == NULL) || (format != 8) || (count == 0)) {
	if (portion) { XFree(portion); portion = 0; }
        return true;
      }
      sn_buffer = (unsigned char*)realloc(sn_buffer, bytesread+count+remaining+1);
      memcpy(sn_buffer+bytesread, portion, count);
      if (portion) { XFree(portion); portion = 0; }
      bytesread += count;
      // Cannot trust data to be null terminated
      sn_buffer[bytesread] = '\0';
      if (!remaining) break;
    }
    if (sn_buffer && Fl::e_clipboard_type == Fl::clipboard_plain_text) {
      sn_buffer[bytesread] = 0;
      convert_crlf(sn_buffer, bytesread);
    }
    if (!fl_selection_requestor) return 0;
    if (Fl::e_clipboard_type == Fl::clipboard_image) {
      if (bytesread == 0) return 0;
      static char tmp_fname[21];
      static Fl_Shared_Image *shared = 0;
      strcpy(tmp_fname, "/tmp/clipboardXXXXXX");
      int fd = mkstemp(tmp_fname);
      if (fd == -1) return 0;
      uchar *p = sn_buffer; ssize_t towrite = bytesread, written;
      while (towrite) {
	written = write(fd, p, towrite);
	p += written; towrite -= written;
	}
      close(fd);
      free(sn_buffer); sn_buffer = 0;
      shared = Fl_Shared_Image::get(tmp_fname);
      fl_unlink(tmp_fname);
      if (!shared) return 0;
      uchar *rgb = new uchar[shared->w() * shared->h() * shared->d()];
      memcpy(rgb, shared->data()[0], shared->w() * shared->h() * shared->d());
      Fl_RGB_Image *image = new Fl_RGB_Image(rgb, shared->w(), shared->h(), shared->d());
      shared->release();
      image->alloc_array = 1;
      Fl::e_clipboard_data = (void*)image;
    }
    else if (Fl::e_clipboard_type == Fl::clipboard_plain_text) {
      Fl::e_text = sn_buffer ? (char*)sn_buffer : (char *)"";
      Fl::e_length = bytesread;
      }
    int old_event = Fl::e_number;
    int retval = fl_selection_requestor->handle(Fl::e_number = FL_PASTE);
    if (!retval && Fl::e_clipboard_type == Fl::clipboard_image) {
      delete (Fl_RGB_Image*)Fl::e_clipboard_data;
      Fl::e_clipboard_data= NULL;
    }
    Fl::e_number = old_event;
    // Detect if this paste is due to Xdnd by the property name (I use
    // XA_SECONDARY for that) and send an XdndFinished message. It is not
    // clear if this has to be delayed until now or if it can be done
    // immediately after calling XConvertSelection.
    if (fl_xevent->xselection.property == XA_SECONDARY &&
        fl_dnd_source_window) {
      fl_sendClientMessage(fl_dnd_source_window, fl_XdndFinished,
                           fl_xevent->xselection.requestor);
      fl_dnd_source_window = 0; // don't send a second time
    }
    return 1;}

  case SelectionClear: {
    int clipboard = fl_xevent->xselectionclear.selection == CLIPBOARD;
    fl_i_own_selection[clipboard] = 0;
    poll_clipboard_owner();
    return 1;}

  case SelectionRequest: {
    XSelectionEvent e;
    e.type = SelectionNotify;
    e.requestor = fl_xevent->xselectionrequest.requestor;
    e.selection = fl_xevent->xselectionrequest.selection;
    int clipboard = e.selection == CLIPBOARD;
    e.target = fl_xevent->xselectionrequest.target;
    e.time = fl_xevent->xselectionrequest.time;
    e.property = fl_xevent->xselectionrequest.property;
    if (fl_selection_type[clipboard] == Fl::clipboard_plain_text) {
      if (e.target == TARGETS) {
	Atom a[3] = {fl_XaUtf8String, XA_STRING, fl_XaText};
	XChangeProperty(fl_display, e.requestor, e.property,
	                XA_ATOM, atom_bits, 0, (unsigned char*)a, 3);
      } else {
	if (/*e.target == XA_STRING &&*/ fl_selection_length[clipboard]) {
	  if (e.target == fl_XaUtf8String ||
	      e.target == XA_STRING ||
	      e.target == fl_XaCompoundText ||
	      e.target == fl_XaText ||
	      e.target == fl_Xatextplain ||
	      e.target == fl_Xatextplainutf ||
	      e.target == fl_Xatextplainutf2) {
	    // clobber the target type, this seems to make some applications
	    // behave that insist on asking for XA_TEXT instead of UTF8_STRING
	    // Does not change XA_STRING as that breaks xclipboard.
	    if (e.target != XA_STRING) e.target = fl_XaUtf8String;
	    XChangeProperty(fl_display, e.requestor, e.property,
		            e.target, 8, 0,
		            (unsigned char *)fl_selection_buffer[clipboard],
		            fl_selection_length[clipboard]);
	  }
	} else {
	  //    char* x = XGetAtomName(fl_display,e.target);
	  //    fprintf(stderr,"selection request of %s\n",x);
	  //    XFree(x);
	  e.property = 0;
	}
      }
    } else { // image in clipboard
      if (e.target == TARGETS) {
	Atom a[1] = {fl_XaImageBmp};
	XChangeProperty(fl_display, e.requestor, e.property,
	                XA_ATOM, atom_bits, 0, (unsigned char*)a, 1);
      } else {
	if (e.target == fl_XaImageBmp && fl_selection_length[clipboard]) {
	    XChangeProperty(fl_display, e.requestor, e.property,
		            e.target, 8, 0,
		            (unsigned char *)fl_selection_buffer[clipboard],
		            fl_selection_length[clipboard]);
	} else {
	  e.property = 0;
	}
      }
    }
    XSendEvent(fl_display, e.requestor, 0, 0, (XEvent *)&e);}
    return 1;

  // events where interesting window id is in a different place:
  case CirculateNotify:
  case CirculateRequest:
  case ConfigureNotify:
  case ConfigureRequest:
  case CreateNotify:
  case DestroyNotify:
  case GravityNotify:
  case MapNotify:
  case MapRequest:
  case ReparentNotify:
  case UnmapNotify:
    xid = xevent.xmaprequest.window;
    break;
  }

  int event = 0;
  Fl_Window* window = fl_find(xid);

  if (window) switch (xevent.type) {

    case DestroyNotify: { // an X11 window was closed externally from the program
      Fl::handle(FL_CLOSE, window);
      Fl_X* X = Fl_X::i(window);
      if (X) { // indicates the FLTK window was not closed
	X->xid = (Window)0; // indicates the X11 window was already destroyed
	window->hide();
	int oldx = window->x(), oldy = window->y();
	window->position(0, 0);
	window->position(oldx, oldy);
	window->show(); // recreate the X11 window in support of the FLTK window
	}
      return 1;
    }
  case ClientMessage: {
    Atom message = fl_xevent->xclient.message_type;
    const long* data = fl_xevent->xclient.data.l;
    if ((Atom)(data[0]) == WM_DELETE_WINDOW) {
      event = FL_CLOSE;
    } else if (message == fl_XdndEnter) {
      fl_xmousewin = window;
      in_a_window = true;
      fl_dnd_source_window = data[0];
      // version number is data[1]>>24
//      printf("XdndEnter, version %ld\n", data[1] >> 24);
      if (data[1]&1) {
        // get list of data types:
        Atom actual; int format; unsigned long count, remaining;
        unsigned char *cm_buffer = 0;
        XGetWindowProperty(fl_display, fl_dnd_source_window, fl_XdndTypeList,
                           0, 0x8000000L, False, XA_ATOM, &actual, &format,
                           &count, &remaining, &cm_buffer);
        if (actual != XA_ATOM || format != 32 || count<4 || !cm_buffer) {
          if ( cm_buffer ) { XFree(cm_buffer); cm_buffer = 0; }
          goto FAILED;
	}
        delete [] fl_dnd_source_types;
        fl_dnd_source_types = new Atom[count+1];
        for (unsigned i = 0; i < count; i++) {
          fl_dnd_source_types[i] = ((Atom*)cm_buffer)[i];
        }
        fl_dnd_source_types[count] = 0;
        XFree(cm_buffer); cm_buffer = 0;
      } else {
      FAILED:
        // less than four data types, or if the above messes up:
        if (!fl_dnd_source_types) fl_dnd_source_types = new Atom[4];
        fl_dnd_source_types[0] = data[2];
        fl_dnd_source_types[1] = data[3];
        fl_dnd_source_types[2] = data[4];
        fl_dnd_source_types[3] = 0;
      }

      // Loop through the source types and pick the first text type...
      unsigned i;
      Atom type = ((Atom*)fl_dnd_source_types)[0];
      for (i = 0; fl_dnd_source_types[i]; i ++) {
        Atom t = ((Atom*)fl_dnd_source_types)[i];
        //printf("fl_dnd_source_types[%d]=%ld(%s)\n",i,t,XGetAtomName(fl_display,t));
        if (t == fl_Xatextplainutf ||		// "text/plain;charset=UTF-8"
            t == fl_Xatextplainutf2 ||		// "text/plain;charset=utf-8" -- See STR#2930
            t == fl_Xatextplain ||		// "text/plain"
            t == fl_XaUtf8String) {		// "UTF8_STRING"
          type = t;
          break;
	}
        // rest are only used if no UTF-8 available:
        if (t == fl_XaText ||			// "TEXT"
            t == fl_XaTextUriList ||		// "text/uri-list"
            t == fl_XaCompoundText) type = t;	// "COMPOUND_TEXT"
      }
      fl_dnd_type = type;

      event = FL_DND_ENTER;
      Fl::e_text = unknown;
      Fl::e_length = unknown_len;
      break;

    } else if (message == fl_XdndPosition) {
      fl_xmousewin = window;
      in_a_window = true;
      fl_dnd_source_window = data[0];
      Fl::e_x_root = data[2]>>16;
      Fl::e_y_root = data[2]&0xFFFF;
      if (window) {
        Fl::e_x = Fl::e_x_root-window->x();
        Fl::e_y = Fl::e_y_root-window->y();
      }
      fl_event_time = data[3];
      fl_dnd_source_action = data[4];
      fl_dnd_action = fl_XdndActionCopy;
      Fl::e_text = unknown;
      Fl::e_length = unknown_len;
      int accept = Fl::handle(FL_DND_DRAG, window);
      fl_sendClientMessage(data[0], fl_XdndStatus,
                           fl_xevent->xclient.window,
                           accept ? 1 : 0,
                           0, // used for xy rectangle to not send position inside
                           0, // used for width+height of rectangle
                           accept ? fl_dnd_action : None);
      return 1;

    } else if (message == fl_XdndLeave) {
      fl_dnd_source_window = 0; // don't send a finished message to it
      event = FL_DND_LEAVE;
      Fl::e_text = unknown;
      Fl::e_length = unknown_len;
      break;

    } else if (message == fl_XdndDrop) {
      fl_xmousewin = window;
      in_a_window = true;
      fl_dnd_source_window = data[0];
      fl_event_time = data[2];
      Window to_window = fl_xevent->xclient.window;
      Fl::e_text = unknown;
      Fl::e_length = unknown_len;
      if (Fl::handle(FL_DND_RELEASE, window)) {
        fl_selection_requestor = Fl::belowmouse();
        Fl::e_clipboard_type = Fl::clipboard_plain_text;
        XConvertSelection(fl_display, fl_XdndSelection,
                          fl_dnd_type, XA_SECONDARY,
                          to_window, fl_event_time);
      } else {
        // Send the finished message if I refuse the drop.
        // It is not clear whether I can just send finished always,
        // or if I have to wait for the SelectionNotify event as the
        // code is currently doing.
        fl_sendClientMessage(fl_dnd_source_window, fl_XdndFinished, to_window);
        fl_dnd_source_window = 0;
      }
      return 1;

    }
    break;}

  case UnmapNotify:
    event = FL_HIDE;
    break;

  case Expose:
    Fl_Window_Driver::driver(window)->wait_for_expose_value = 0;
#  if 0
    // try to keep windows on top even if WM_TRANSIENT_FOR does not work:
    // opaque move/resize window managers do not like this, so I disabled it.
    if (Fl::first_window()->non_modal() && window != Fl::first_window())
      Fl::first_window()->show();
#  endif

  case GraphicsExpose:
    {
#if USE_XFT
      int ns = Fl_Window_Driver::driver(window)->screen_num();
      float s = Fl::screen_driver()->scale(ns);
      window->damage(FL_DAMAGE_EXPOSE, xevent.xexpose.x/s, xevent.xexpose.y/s,
                     xevent.xexpose.width/s + 2, xevent.xexpose.height/s + 2);
#else
      window->damage(FL_DAMAGE_EXPOSE, xevent.xexpose.x, xevent.xexpose.y,
                     xevent.xexpose.width, xevent.xexpose.height);
#endif
     }
    return 1;

  case FocusIn:
    if (fl_xim_ic) XSetICFocus(fl_xim_ic);
    event = FL_FOCUS;
    // If the user has toggled from another application to this one,
    // then it's a good time to check for clipboard changes.
    poll_clipboard_owner();
    break;

  case FocusOut:
    if (fl_xim_ic) XUnsetICFocus(fl_xim_ic);
    event = FL_UNFOCUS;
    break;

  case KeyPress:
  case KeyRelease: {
  KEYPRESS:
    int keycode = xevent.xkey.keycode;
    fl_key_vector[keycode/8] |= (1 << (keycode%8));
    static char *kp_buffer = NULL;
    static int kp_buffer_len = 0;
    int len=0;
    KeySym keysym;
    if (kp_buffer_len == 0) {
      kp_buffer_len = 4096;
      kp_buffer = (char*) malloc(kp_buffer_len);
    }
    if (xevent.type == KeyPress) {
      event = FL_KEYDOWN;
      len = 0;

      if (fl_xim_ic) {
	Status status;
	len = XUtf8LookupString(fl_xim_ic, (XKeyPressedEvent *)&xevent.xkey,
			     kp_buffer, kp_buffer_len, &keysym, &status);

	while (status == XBufferOverflow && kp_buffer_len < 50000) {
	  kp_buffer_len = kp_buffer_len * 5 + 1;
	  kp_buffer = (char*)realloc(kp_buffer, kp_buffer_len);
	  len = XUtf8LookupString(fl_xim_ic, (XKeyPressedEvent *)&xevent.xkey,
			     kp_buffer, kp_buffer_len, &keysym, &status);
	}
	keysym = fl_KeycodeToKeysym(fl_display, keycode, 0);
      } else {
        //static XComposeStatus compose;
        len = XLookupString((XKeyEvent*)&(xevent.xkey),
                             kp_buffer, kp_buffer_len, &keysym, 0/*&compose*/);
        if (keysym && keysym < 0x400) { // a character in latin-1,2,3,4 sets
          // force it to type a character (not sure if this ever is needed):
          // if (!len) {kp_buffer[0] = char(keysym); len = 1;}
          len = fl_utf8encode(XKeysymToUcs(keysym), kp_buffer);
          if (len < 1) len = 1;
          // ignore all effects of shift on the keysyms, which makes it a lot
          // easier to program shortcuts and is Windoze-compatible:
          keysym = fl_KeycodeToKeysym(fl_display, keycode, 0);
        }
      }
      kp_buffer[len] = 0;
      Fl::e_text = kp_buffer;
      Fl::e_length = len;
    } else {
      // Stupid X sends fake key-up events when a repeating key is held
      // down, probably due to some back compatibility problem. Fortunately
      // we can detect this because the repeating KeyPress event is in
      // the queue, get it and execute it instead:

      // Bool XkbSetDetectableAutoRepeat ( display, detectable, supported_rtrn )
      // Display * display ;
      // Bool detectable ;
      // Bool * supported_rtrn ;
      // ...would be the easy way to correct this issue. Unfortunately, this call is also
      // broken on many Unix distros including Ubuntu and Solaris (as of Dec 2009)

      // Bogus KeyUp events are generated by repeated KeyDown events. One
      // necessary condition is an identical key event pending right after
      // the bogus KeyUp.
      // The new code introduced Dec 2009 differs in that it only checks the very
      // next event in the queue, not the entire queue of events.
      // This function wrongly detects a repeat key if a software keyboard
      // sends a burst of events containing two consecutive equal keys. However,
      // in every non-gaming situation, this is no problem because both KeyPress
      // events will cause the expected behavior.
      XEvent peekevent;
      if (XPending(fl_display)) {
        XPeekEvent(fl_display, &peekevent);
        if (   (peekevent.type == KeyPress) // must be a KeyPress event
            && (peekevent.xkey.keycode == xevent.xkey.keycode) // must be the same key
            && (peekevent.xkey.time == xevent.xkey.time) // must be sent at the exact same time
            ) {
          XNextEvent(fl_display, &xevent);
          goto KEYPRESS;
        }
      }

      event = FL_KEYUP;
      fl_key_vector[keycode/8] &= ~(1 << (keycode%8));
      // keyup events just get the unshifted keysym:
      keysym = fl_KeycodeToKeysym(fl_display, keycode, 0);
    }
#  ifdef __sgi
    // You can plug a microsoft keyboard into an sgi but the extra shift
    // keys are not translated.  Make them translate like XFree86 does:
    if (!keysym) switch(keycode) {
    case 147: keysym = FL_Meta_L; break;
    case 148: keysym = FL_Meta_R; break;
    case 149: keysym = FL_Menu; break;
    }
#  endif
#  ifdef BACKSPACE_HACK
    // Attempt to fix keyboards that send "delete" for the key in the
    // upper-right corner of the main keyboard.  But it appears that
    // very few of these remain?
    static int got_backspace = 0;
    if (!got_backspace) {
      if (keysym == FL_Delete) keysym = FL_BackSpace;
      else if (keysym == FL_BackSpace) got_backspace = 1;
    }
#  endif
    // For the first few years, there wasn't a good consensus on what the
    // Windows keys should be mapped to for X11. So we need to help out a
    // bit and map all variants to the same FLTK key...
    switch (keysym) {
	case XK_Meta_L:
	case XK_Hyper_L:
	case XK_Super_L:
	  keysym = FL_Meta_L;
	  break;
	case XK_Meta_R:
	case XK_Hyper_R:
	case XK_Super_R:
	  keysym = FL_Meta_R;
	  break;
      }
    // Convert the multimedia keys to safer, portable values
    switch (keysym) { // XF names come from X11/XF86keysym.h
      case 0x1008FF11: // XF86XK_AudioLowerVolume:
	keysym = FL_Volume_Down;
	break;
      case 0x1008FF12: // XF86XK_AudioMute:
	keysym = FL_Volume_Mute;
	break;
      case 0x1008FF13: // XF86XK_AudioRaiseVolume:
	keysym = FL_Volume_Up;
	break;
      case 0x1008FF14: // XF86XK_AudioPlay:
	keysym = FL_Media_Play;
	break;
      case 0x1008FF15: // XF86XK_AudioStop:
	keysym = FL_Media_Stop;
	break;
      case 0x1008FF16: // XF86XK_AudioPrev:
	keysym = FL_Media_Prev;
	break;
      case 0x1008FF17: // XF86XK_AudioNext:
	keysym = FL_Media_Next;
	break;
      case 0x1008FF18: // XF86XK_HomePage:
	keysym = FL_Home_Page;
	break;
      case 0x1008FF19: // XF86XK_Mail:
	keysym = FL_Mail;
	break;
      case 0x1008FF1B: // XF86XK_Search:
	keysym = FL_Search;
	break;
      case 0x1008FF26: // XF86XK_Back:
	keysym = FL_Back;
	break;
      case 0x1008FF27: // XF86XK_Forward:
	keysym = FL_Forward;
	break;
      case 0x1008FF28: // XF86XK_Stop:
	keysym = FL_Stop;
	break;
      case 0x1008FF29: // XF86XK_Refresh:
	keysym = FL_Refresh;
	break;
      case 0x1008FF2F: // XF86XK_Sleep:
	keysym = FL_Sleep;
	break;
      case 0x1008FF30: // XF86XK_Favorites:
	keysym = FL_Favorites;
	break;
    }
    // We have to get rid of the XK_KP_function keys, because they are
    // not produced on Windoze and thus case statements tend not to check
    // for them.  There are 15 of these in the range 0xff91 ... 0xff9f
    if (keysym >= 0xff91 && keysym <= 0xff9f) {
      // Map keypad keysym to character or keysym depending on
      // numlock state...
      unsigned long keysym1 = fl_KeycodeToKeysym(fl_display, keycode, 1);
      if (keysym1 <= 0x7f || (keysym1 > 0xff9f && keysym1 <= FL_KP_Last))
        Fl::e_original_keysym = (int)(keysym1 | FL_KP);
      if ((xevent.xkey.state & Mod2Mask) &&
          (keysym1 <= 0x7f || (keysym1 > 0xff9f && keysym1 <= FL_KP_Last))) {
        // Store ASCII numeric keypad value...
        keysym = keysym1 | FL_KP;
        kp_buffer[0] = char(keysym1) & 0x7F;
        len = 1;
      } else {
        // Map keypad to special key...
        static const unsigned short table[15] = {
          FL_F+1, FL_F+2, FL_F+3, FL_F+4,
          FL_Home, FL_Left, FL_Up, FL_Right,
          FL_Down, FL_Page_Up, FL_Page_Down, FL_End,
          0xff0b/*XK_Clear*/, FL_Insert, FL_Delete};
        keysym = table[keysym-0xff91];
      }
    } else {
      // Store this so we can later know if the KP was used
      Fl::e_original_keysym = (int)keysym;
    }
    Fl::e_keysym = int(keysym);

    // replace XK_ISO_Left_Tab (Shift-TAB) with FL_Tab (modifier flags are set correctly by X11)
    if (Fl::e_keysym == 0xfe20) Fl::e_keysym = FL_Tab;

    set_event_xy(window);
    Fl::e_is_click = 0; }
    break;
  
  case ButtonPress:
    Fl::e_keysym = FL_Button + xevent.xbutton.button;
    set_event_xy(window);
    Fl::e_dx = Fl::e_dy = 0;
    if (xevent.xbutton.button == Button4) {
      Fl::e_dy = -1; // Up
      event = FL_MOUSEWHEEL;
    } else if (xevent.xbutton.button == Button5) {
      Fl::e_dy = +1; // Down
      event = FL_MOUSEWHEEL;
    } else if (xevent.xbutton.button == 6) {
	Fl::e_dx = -1; // Left
	event = FL_MOUSEWHEEL;
    } else if (xevent.xbutton.button == 7) {
	Fl::e_dx = +1; // Right
	event = FL_MOUSEWHEEL;
    } else {
      Fl::e_state |= (FL_BUTTON1 << (xevent.xbutton.button-1));
      event = FL_PUSH;
      checkdouble();
    }

    fl_xmousewin = window;
    in_a_window = true;
    break;

  case PropertyNotify:
    if (xevent.xproperty.atom == fl_NET_WM_STATE) {
      int fullscreen_state = 0;
      if (xevent.xproperty.state != PropertyDelete) {
        unsigned long nitems;
        unsigned long *words = 0;
        if (0 == get_xwinprop(xid, fl_NET_WM_STATE, 64, &nitems, &words) ) { 
          for (unsigned long item = 0; item < nitems; item++) {
            if (words[item] == fl_NET_WM_STATE_FULLSCREEN) {
              fullscreen_state = 1;
            }
          }
        }
	if ( words ) { XFree(words); words = 0; }
      }
      if (window->fullscreen_active() && !fullscreen_state) {
        window->_clear_fullscreen();
        event = FL_FULLSCREEN;
      }
      if (!window->fullscreen_active() && fullscreen_state) {
        window->_set_fullscreen();
        event = FL_FULLSCREEN;
      }
    }
    break;

  case MotionNotify:
    set_event_xy(window);
#  if CONSOLIDATE_MOTION
    send_motion = fl_xmousewin = window;
    in_a_window = true;
    return 0;
#  else
    event = FL_MOVE;
    fl_xmousewin = window;
    in_a_window = true;
    break;
#  endif

  case ButtonRelease:
    Fl::e_keysym = FL_Button + xevent.xbutton.button;
    set_event_xy(window);
    Fl::e_state &= ~(FL_BUTTON1 << (xevent.xbutton.button-1));
    if (xevent.xbutton.button == Button4 ||
        xevent.xbutton.button == Button5) return 0;
    event = FL_RELEASE;

    fl_xmousewin = window;
    in_a_window = true;
    break;

  case EnterNotify:
    if (xevent.xcrossing.detail == NotifyInferior) break;
    // XInstallColormap(fl_display, Fl_X::i(window)->colormap);
    set_event_xy(window);
    Fl::e_state = xevent.xcrossing.state << 16;
    event = FL_ENTER;

    fl_xmousewin = window;
    in_a_window = true;
    { XIMStyles *xim_styles = NULL;
      if(!fl_xim_im || XGetIMValues(fl_xim_im, XNQueryInputStyle, &xim_styles, NULL, NULL)) {
	fl_init_xim();
      }
      if (xim_styles) XFree(xim_styles);
    }
    break;

  case LeaveNotify:
    if (xevent.xcrossing.detail == NotifyInferior) break;
    set_event_xy(window);
    Fl::e_state = xevent.xcrossing.state << 16;
    fl_xmousewin = 0;
    in_a_window = false; // make do_queued_events produce FL_LEAVE event
    return 0;

  // We cannot rely on the x,y position in the configure notify event.
  // I now think this is an unavoidable problem with X: it is impossible
  // for a window manager to prevent the "real" notify event from being
  // sent when it resizes the contents, even though it can send an
  // artificial event with the correct position afterwards (and some
  // window managers do not send this fake event anyway)
  // So anyway, do a round trip to find the correct x,y:
  case MapNotify:
    event = FL_SHOW;

  case ConfigureNotify: {
    if (window->parent()) break; // ignore child windows

    // figure out where OS really put window
    XWindowAttributes actual;
    XGetWindowAttributes(fl_display, fl_xid(window), &actual);
    Window cr; int X, Y, W = actual.width, H = actual.height;
    XTranslateCoordinates(fl_display, fl_xid(window), actual.root,
                          0, 0, &X, &Y, &cr);
#if USE_XFT // detect when window centre changes screen
    Fl_X11_Screen_Driver *d = (Fl_X11_Screen_Driver*)Fl::screen_driver();
    Fl_X11_Window_Driver *wd = Fl_X11_Window_Driver::driver(window);
    int olds = wd->screen_num();
    int num = d->screen_num_unscaled(X+ actual.width/2, Y +actual.height/2);
    if (num == -1) num = olds;
    float s = d->scale(num);
    if (num != olds) {
      if (s != d->scale(olds) &&
          !Fl_X11_Window_Driver::data_for_resize_window_between_screens_.busy &&
          window->user_data() != &Fl_X11_Screen_Driver::transient_scale_display) {
        Fl_X11_Window_Driver::data_for_resize_window_between_screens_.busy = true;
        Fl_X11_Window_Driver::data_for_resize_window_between_screens_.screen = num;
        // resize_after_screen_change() works also if called here, but calling it
        // a second later gives a more pleasant user experience when moving windows between distinct screens
        Fl::add_timeout(1, Fl_X11_Window_Driver::resize_after_screen_change, window);
      }
      wd->screen_num(num);
    }
#endif // USE_XFT

    // tell Fl_Window about it and set flag to prevent echoing:
    resize_bug_fix = window;
#if USE_XFT    
    if (!Fl_X11_Window_Driver::data_for_resize_window_between_screens_.busy &&
      ( ceil(W/s) != window->w() || ceil(H/s) != window->h() ) ) {
        window->resize(X/s, Y/s, ceil(W/s), ceil(H/s));
    } else {
      window->position(X/s, Y/s);
    }
#else
    window->resize(X, Y, W, H);
#endif
    break; // allow add_handler to do something too
    }

  case ReparentNotify: {
    int xpos, ypos;
    Window junk;

    // on some systems, the ReparentNotify event is not handled as we would expect.
    XErrorHandler oldHandler = XSetErrorHandler(catchXExceptions());

    //ReparentNotify gives the new position of the window relative to
    //the new parent. FLTK cares about the position on the root window.
    XTranslateCoordinates(fl_display, xevent.xreparent.parent,
                          XRootWindow(fl_display, fl_screen),
                          xevent.xreparent.x, xevent.xreparent.y,
                          &xpos, &ypos, &junk);
    XSetErrorHandler(oldHandler);

    // tell Fl_Window about it and set flag to prevent echoing:
    if ( !wasXExceptionRaised() ) {
      resize_bug_fix = window;
#if USE_XFT
      int ns = Fl_Window_Driver::driver(window)->screen_num();
      float s = Fl::screen_driver()->scale(ns);
#else
      float s = 1;
#endif
      window->position(xpos/s, ypos/s);
    }
    break;
    }
  }

#if HAVE_XFIXES
  switch (xevent.type - xfixes_event_base) {
  case XFixesSelectionNotify: {
    // Someone feeding us bogus events?
    if (!have_xfixes)
      return true;

    XFixesSelectionNotifyEvent *selection_notify = (XFixesSelectionNotifyEvent *)&xevent;

    if ((selection_notify->selection == XA_PRIMARY) && !fl_i_own_selection[0])
      handle_clipboard_timestamp(0, selection_notify->selection_timestamp);
    else if ((selection_notify->selection == CLIPBOARD) && !fl_i_own_selection[1])
      handle_clipboard_timestamp(1, selection_notify->selection_timestamp);

    return true;
    }
  }
#endif

  return Fl::handle(event, window);
}

////////////////////////////////////////////////////////////////

void Fl_X11_Window_Driver::resize(int X,int Y,int W,int H) {
  int is_a_move = (X != x() || Y != y() || is_a_rescale());
  int is_a_resize = (W != w() || H != h() || is_a_rescale());
  int resize_from_program = (pWindow != resize_bug_fix);
  if (!resize_from_program) resize_bug_fix = 0;
  if (is_a_move && resize_from_program) force_position(1);
  else if (!is_a_resize && !is_a_move) return;
  if (is_a_resize) {
    pWindow->Fl_Group::resize(X,Y,W,H);
    if (shown()) {pWindow->redraw();}
  } else {
    x(X); y(Y);
  }

  if (resize_from_program && is_a_resize && !pWindow->resizable()) {
    pWindow->size_range(w(), h(), w(), h());
  }

  if (resize_from_program && shown()) {
    float s = Fl::screen_driver()->scale(screen_num());
    if (is_a_resize) {
      if (!pWindow->resizable()) pWindow->size_range(w(), h(), w(), h());
      if (is_a_move) {
        XMoveResizeWindow(fl_display, fl_xid(pWindow), X*s, Y*s, W>0 ? W*s : 1, H>0 ? H*s : 1);
      } else {
        XResizeWindow(fl_display, fl_xid(pWindow), W>0 ? W*s : 1, H>0 ? H*s : 1);
      }
    } else
      XMoveWindow(fl_display, fl_xid(pWindow), X*s, Y*s);
  }
}

////////////////////////////////////////////////////////////////

#define _NET_WM_STATE_REMOVE        0  /* remove/unset property */
#define _NET_WM_STATE_ADD           1  /* add/set property */
#define _NET_WM_STATE_TOGGLE        2  /* toggle property  */

static void send_wm_event(Window wnd, Atom message,
                          unsigned long d0, unsigned long d1=0,
                          unsigned long d2=0, unsigned long d3=0,
                          unsigned long d4=0) {
  XEvent e;
  e.xany.type = ClientMessage;
  e.xany.window = wnd;
  e.xclient.message_type = message;
  e.xclient.format = 32;
  e.xclient.data.l[0] = d0;
  e.xclient.data.l[1] = d1;
  e.xclient.data.l[2] = d2;
  e.xclient.data.l[3] = d3;
  e.xclient.data.l[4] = d4;
  XSendEvent(fl_display, RootWindow(fl_display, fl_screen),
             0, SubstructureNotifyMask | SubstructureRedirectMask,
             &e);
}

static void send_wm_state_event(Window wnd, int add, Atom prop) {
  send_wm_event(wnd, fl_NET_WM_STATE,
                add ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE, prop);
}

int Fl_X11_Screen_Driver::ewmh_supported() {
  static int result = -1;

  if (result == -1) {
    fl_open_display();
    result = 0;
    unsigned long nitems;
    unsigned long *words = 0;
    if (0 == get_xwinprop(XRootWindow(fl_display, fl_screen), fl_NET_SUPPORTING_WM_CHECK, 64,
                          &nitems, &words) && nitems == 1) {
      Window child = words[0];
      if ( words ) { XFree(words); words = 0; }
      if (0 == get_xwinprop(child, fl_NET_SUPPORTING_WM_CHECK, 64,
                           &nitems, &words) ) {
        if ( nitems == 1) result = (child == words[0]);
      }
    }
    if ( words ) { XFree(words); words = 0; }
  }

  return result;
}

#if HAVE_XRENDER
static int xrender_supported() {
  int nop1, nop2;
  fl_open_display();
  return XRenderQueryExtension(fl_display, &nop1, &nop2);
}
#endif

char Fl_Xlib_Graphics_Driver::can_do_alpha_blending() {
#if HAVE_XRENDER
  static char result = (char)xrender_supported();
  return result;
#else
  return 0;
#endif
}

extern Fl_Window *fl_xfocus;

void Fl_X11_Window_Driver::activate_window() {
  Window w = fl_xid(pWindow);
  if (!Fl_X11_Screen_Driver::ewmh_supported())
    return;

  Window prev = 0;

  if (fl_xfocus) {
    Fl_X *x = Fl_X::i(fl_xfocus);
    if (!x)
      return;
    prev = x->xid;
  }

  send_wm_event(w, fl_NET_ACTIVE_WINDOW, 1 /* application */,
                0 /* timestamp */, prev /* previously active window */);
}

/* Change an existing window to fullscreen */
void Fl_X11_Window_Driver::fullscreen_on() {
  if (Fl_X11_Screen_Driver::ewmh_supported()) {
    int top, bottom, left, right;
    
    top = fullscreen_screen_top();
    bottom = fullscreen_screen_bottom();
    left = fullscreen_screen_left();
    right = fullscreen_screen_right();
    
    if ((top < 0) || (bottom < 0) || (left < 0) || (right < 0)) {
      top = screen_num();
      bottom = top;
      left = top;
      right = top;
    }
    
    send_wm_event(fl_xid(pWindow), fl_NET_WM_FULLSCREEN_MONITORS,
                  top, bottom, left, right);
    send_wm_state_event(fl_xid(pWindow), 1, fl_NET_WM_STATE_FULLSCREEN);
  } else {
    pWindow->_set_fullscreen();
    hide();
    show();
    /* We want to grab the window, not a widget, so we cannot use Fl::grab */
    XGrabKeyboard(fl_display, fl_xid(pWindow), 1, GrabModeAsync, GrabModeAsync, fl_event_time);
    Fl::handle(FL_FULLSCREEN, pWindow);
  }
}

void Fl_X11_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
  if (Fl_X11_Screen_Driver::ewmh_supported()) {
    send_wm_state_event(fl_xid(pWindow), 0, fl_NET_WM_STATE_FULLSCREEN);
  } else {
    pWindow->_clear_fullscreen();
    /* The grab will be lost when the window is destroyed */
    hide();
    resize(X,Y,W,H);
    show();
    Fl::handle(FL_FULLSCREEN, pWindow);
  }
}

////////////////////////////////////////////////////////////////

// A subclass of Fl_Window may call this to associate an X window it
// creates with the Fl_Window:

void fl_fix_focus(); // in Fl.cxx

Fl_X* Fl_X::set_xid(Fl_Window* win, Window winxid) {
  Fl_X *xp = new Fl_X;
  xp->xid = winxid;
  Fl_Window_Driver::driver(win)->other_xid = 0;
  xp->w = win; win->i = xp;
  xp->next = Fl_X::first;
  xp->region = 0;
  Fl_Window_Driver::driver(win)->wait_for_expose_value = 1;
#ifdef USE_XDBE
  Fl_X11_Window_Driver::driver(win)->backbuffer_bad = 1;
#endif
  Fl_X::first = xp;
  if (win->modal()) {Fl::modal_ = win; fl_fix_focus();}
  return xp;
}

// More commonly a subclass calls this, because it hides the really
// ugly parts of X and sets all the stuff for a window that is set
// normally.  The global variables like fl_show_iconic are so that
// subclasses of *that* class may change the behavior...

int fl_background_pixel = -1; // hack to speed up bg box drawing
int fl_disable_transient_for; // secret method of removing TRANSIENT_FOR

static const int childEventMask = ExposureMask;

static const int XEventMask =
ExposureMask|StructureNotifyMask
|KeyPressMask|KeyReleaseMask|KeymapStateMask|FocusChangeMask
|ButtonPressMask|ButtonReleaseMask
|EnterWindowMask|LeaveWindowMask
|PropertyChangeMask
|PointerMotionMask;

void Fl_X::make_xid(Fl_Window* win, XVisualInfo *visual, Colormap colormap)
{
  Fl_Group::current(0); // get rid of very common user bug: forgot end()

  int X = win->x();
  int Y = win->y();
  int W = win->w();
  if (W <= 0) W = 1; // X don't like zero...
  int H = win->h();
  if (H <= 0) H = 1; // X don't like zero...
  if (!win->parent() && !Fl::grab()) {
    // center windows in case window manager does not do anything:
#ifdef FL_CENTER_WINDOWS
    if (!win->force_position()) {
      win->x(X = scr_x+(scr_w-W)/2);
      win->y(Y = scr_y+(scr_h-H)/2);
    }
#endif // FL_CENTER_WINDOWS

    // force the window to be on-screen.  Usually the X window manager
    // does this, but a few don't, so we do it here for consistency:
    int scr_x, scr_y, scr_w, scr_h;
    Fl::screen_xywh(scr_x, scr_y, scr_w, scr_h, X, Y, W, H);

    if (win->border()) {
      // ensure border is on screen:
      // (assume extremely minimal dimensions for this border)
      const int top = 20;
      const int left = 1;
      const int right = 1;
      const int bottom = 1;
      if (X+W+right > scr_x+scr_w) X = scr_x+scr_w-right-W;
      if (X-left < scr_x) X = scr_x+left;
      if (Y+H+bottom > scr_y+scr_h) Y = scr_y+scr_h-bottom-H;
      if (Y-top < scr_y) Y = scr_y+top;
    }
    // now insure contents are on-screen (more important than border):
    if (X+W > scr_x+scr_w) X = scr_x+scr_w-W;
    if (X < scr_x) X = scr_x;
    if (Y+H > scr_y+scr_h) Y = scr_y+scr_h-H;
    if (Y < scr_y) Y = scr_y;
  }

  // if the window is a subwindow and our parent is not mapped yet, we
  // mark this window visible, so that mapping the parent at a later
  // point in time will call this function again to finally map the subwindow.
  if (win->parent() && !Fl_X::i(win->window())) {
    win->set_visible();
    return;
  }

  // Compute which screen(s) we should be on if we want to go fullscreen
  int fullscreen_top, fullscreen_bottom, fullscreen_left, fullscreen_right;

  fullscreen_top = win->fullscreen_screen_top;
  fullscreen_bottom = win->fullscreen_screen_bottom;
  fullscreen_left = win->fullscreen_screen_left;
  fullscreen_right = win->fullscreen_screen_right;

  if ((fullscreen_top < 0) || (fullscreen_bottom < 0) ||
      (fullscreen_left < 0) || (fullscreen_right < 0)) {
    fullscreen_top = Fl::screen_num(X, Y, W, H);
    fullscreen_bottom = fullscreen_top;
    fullscreen_left = fullscreen_top;
    fullscreen_right = fullscreen_top;
  }


  ulong root = win->parent() ?
    fl_xid(win->window()) : RootWindow(fl_display, fl_screen);

  XSetWindowAttributes attr;
  int mask = CWBorderPixel|CWColormap|CWEventMask|CWBitGravity;
  attr.event_mask = win->parent() ? childEventMask : XEventMask;
  attr.colormap = colormap;
  attr.border_pixel = 0;
  attr.bit_gravity = 0; // StaticGravity;
  if (win->override()) {
    attr.override_redirect = 1;
    attr.save_under = 1;
    mask |= CWOverrideRedirect | CWSaveUnder;
  } else attr.override_redirect = 0;
  if (Fl::grab()) {
    attr.save_under = 1; mask |= CWSaveUnder;
    if (!win->border()) {attr.override_redirect = 1; mask |= CWOverrideRedirect;}
  }
  // For the non-EWMH fullscreen case, we cannot use the code above,
  // since we do not want save_under, do not want to turn off the
  // border, and cannot grab without an existing window. Besides, 
  // there is no clear_override(). 
  if (win->fullscreen_active() && !Fl_X11_Screen_Driver::ewmh_supported()) {
    int sx, sy, sw, sh;
    attr.override_redirect = 1;
    mask |= CWOverrideRedirect;
    Fl::screen_xywh(sx, sy, sw, sh, fullscreen_left);
    X = sx;
    Fl::screen_xywh(sx, sy, sw, sh, fullscreen_right);
    W = sx + sw - X;
    Fl::screen_xywh(sx, sy, sw, sh, fullscreen_top);
    Y = sy;
    Fl::screen_xywh(sx, sy, sw, sh, fullscreen_bottom);
    H = sy + sh - Y;
  }

  if (fl_background_pixel >= 0) {
    attr.background_pixel = fl_background_pixel;
    fl_background_pixel = -1;
    mask |= CWBackPixel;
  }
  float s = 1;
#if USE_XFT
  //compute adequate screen where to put the window
  int nscreen = 0;
  if (win->parent()) {
    nscreen = Fl_Window_Driver::driver(win->top_window())->screen_num();
  } else if (win->force_position() && Fl_X11_Window_Driver::driver(win)->screen_num_ >= 0) {
    nscreen = Fl_Window_Driver::driver(win)->screen_num();
  } else {
    Fl_Window *hint = Fl::first_window();
    if (hint) {
      nscreen = Fl_Window_Driver::driver(hint->top_window())->screen_num();
    }
  }
  Fl_X11_Window_Driver::driver(win)->screen_num(nscreen);
  s = Fl::screen_driver()->scale(nscreen);
//if (!win->parent()) printf("win creation on screen #%d\n", nscreen);
#endif
  Fl_X* xp =
    set_xid(win, XCreateWindow(fl_display,
                               root,
                               X*s, Y*s, W*s, H*s,
                               0, // borderwidth
                               visual->depth,
                               InputOutput,
                               visual->visual,
                               mask, &attr));
  int showit = 1;

  // Set WM_CLIENT_MACHINE and WM_LOCALE_NAME
  XSetWMProperties(fl_display, xp->xid, NULL, NULL, NULL, 0, NULL, NULL, NULL);

  // Set _NET_WM_PID
  long pid;
  pid = getpid();
  XChangeProperty(fl_display, xp->xid, fl_NET_WM_PID,
		  XA_CARDINAL, 32, 0, (unsigned char *)&pid, 1);

  if (!win->parent() && !attr.override_redirect) {
    // Communicate all kinds 'o junk to the X Window Manager:

    win->label(win->label(), win->iconlabel());

    XChangeProperty(fl_display, xp->xid, WM_PROTOCOLS,
                    XA_ATOM, 32, 0, (uchar*)&WM_DELETE_WINDOW, 1);

    // send size limits and border:
    Fl_X11_Window_Driver::driver(win)->sendxjunk();

    // set the class property, which controls the icon used:
    if (win->xclass()) {
      char buffer[1024];
      const char *xclass = win->xclass();
      const int len = strlen(xclass);
      // duplicate the xclass string for use as XA_WM_CLASS
      strcpy(buffer, xclass);
      strcpy(buffer + len + 1, xclass);
      // create the capitalized version:
      buffer[len + 1] = toupper(buffer[len + 1]);
      if (buffer[len + 1] == 'X')
        buffer[len + 2] = toupper(buffer[len + 2]);
      XChangeProperty(fl_display, xp->xid, XA_WM_CLASS, XA_STRING, 8, 0,
                      (unsigned char *)buffer, len * 2 + 2);
    }

    if (win->non_modal() && xp->next && !fl_disable_transient_for) {
      // find some other window to be "transient for":
      Fl_Window* wp = xp->next->w;
      while (wp->parent()) wp = wp->window();
      XSetTransientForHint(fl_display, xp->xid, fl_xid(wp));
      if (!wp->visible()) showit = 0; // guess that wm will not show it
      if (win->modal()) {
        Atom net_wm_state = XInternAtom (fl_display, "_NET_WM_STATE", 0);
        Atom net_wm_state_skip_taskbar = XInternAtom (fl_display, "_NET_WM_STATE_MODAL", 0);
        XChangeProperty (fl_display, xp->xid, net_wm_state, XA_ATOM, 32,
            PropModeAppend, (unsigned char*) &net_wm_state_skip_taskbar, 1);
      }
    }

    // Make sure that borderless windows do not show in the task bar
    if (!win->border()) {
      Atom net_wm_state = XInternAtom (fl_display, "_NET_WM_STATE", 0);
      Atom net_wm_state_skip_taskbar = XInternAtom (fl_display, "_NET_WM_STATE_SKIP_TASKBAR", 0);
      XChangeProperty (fl_display, xp->xid, net_wm_state, XA_ATOM, 32,
          PropModeAppend, (unsigned char*) &net_wm_state_skip_taskbar, 1);
    }

    // If asked for, create fullscreen
    if (win->fullscreen_active() && Fl_X11_Screen_Driver::ewmh_supported()) {
      unsigned long data[4];
      data[0] = fullscreen_top;
      data[1] = fullscreen_bottom;
      data[2] = fullscreen_left;
      data[3] = fullscreen_right;
      XChangeProperty (fl_display, xp->xid, fl_NET_WM_FULLSCREEN_MONITORS, XA_ATOM, 32,
                       PropModeReplace, (unsigned char*) data, 4);
      XChangeProperty (fl_display, xp->xid, fl_NET_WM_STATE, XA_ATOM, 32,
                       PropModeAppend, (unsigned char*) &fl_NET_WM_STATE_FULLSCREEN, 1);
    }

    // Make it receptive to DnD:
    long version = 4;
    XChangeProperty(fl_display, xp->xid, fl_XdndAware,
                    XA_ATOM, sizeof(int)*8, 0, (unsigned char*)&version, 1);

    XWMHints *hints = XAllocWMHints();
    hints->input = True;
    hints->flags = InputHint;
    if (Fl_Window::show_iconic_) {
      hints->flags |= StateHint;
      hints->initial_state = IconicState;
      Fl_Window::show_iconic_ = 0;
      showit = 0;
    }
    if (Fl_X11_Window_Driver::driver(win)->icon_->legacy_icon) {
      hints->icon_pixmap = (Pixmap)Fl_X11_Window_Driver::driver(win)->icon_->legacy_icon;
      hints->flags       |= IconPixmapHint;
    }
    XSetWMHints(fl_display, xp->xid, hints);
    XFree(hints);

    Fl_X11_Window_Driver::driver(win)->set_icons();
  }

  // set the window type for menu and tooltip windows to avoid animations (compiz)
  if (win->menu_window() || win->tooltip_window()) {
    Atom net_wm_type = XInternAtom(fl_display, "_NET_WM_WINDOW_TYPE", False);
    Atom net_wm_type_kind = XInternAtom(fl_display, "_NET_WM_WINDOW_TYPE_MENU", False);
    XChangeProperty(fl_display, xp->xid, net_wm_type, XA_ATOM, 32, PropModeReplace, (unsigned char*)&net_wm_type_kind, 1);
  }

#if HAVE_XFIXES
  // register for clipboard change notifications
  if (have_xfixes && !win->parent()) {
    XFixesSelectSelectionInput(fl_display, xp->xid, XA_PRIMARY,
                               XFixesSetSelectionOwnerNotifyMask);
    XFixesSelectSelectionInput(fl_display, xp->xid, CLIPBOARD,
                               XFixesSetSelectionOwnerNotifyMask);
  }
#endif

  if (win->is_shaped()) {
    Fl_X11_Window_Driver::driver(win)->combine_mask();
    }
  XMapWindow(fl_display, xp->xid);
  if (showit) {
    win->set_visible();
    int old_event = Fl::e_number;
    win->handle(Fl::e_number = FL_SHOW); // get child windows to appear
    Fl::e_number = old_event;
    win->redraw();
  }

  // non-EWMH fullscreen case, need grab
  if (win->fullscreen_active() && !Fl_X11_Screen_Driver::ewmh_supported()) {
    XGrabKeyboard(fl_display, xp->xid, 1, GrabModeAsync, GrabModeAsync, fl_event_time);
  }

}

////////////////////////////////////////////////////////////////
// Send X window stuff that can be changed over time:

void Fl_X11_Window_Driver::sendxjunk() {
  Fl_Window *w = pWindow;
  if (w->parent() || w->override()) return; // it's not a window manager window!

  if (!size_range_set()) { // default size_range based on resizable():
    if (w->resizable()) {
      Fl_Widget *o = w->resizable();
      int minw = o->w(); if (minw > 100) minw = 100;
      int minh = o->h(); if (minh > 100) minh = 100;
      w->size_range(w->w() - o->w() + minw, w->h() - o->h() + minh, 0, 0);
    } else {
      w->size_range(w->w(), w->h(), w->w(), w->h());
    }
    return; // because this recursively called here
  }

  XSizeHints *hints = XAllocSizeHints();
  // memset(&hints, 0, sizeof(hints)); jreiser suggestion to fix purify?
  float s = Fl::screen_driver()->scale(screen_num());

  hints->min_width = s*minw();
  hints->min_height = s*minh();
  hints->max_width = s*maxw();
  hints->max_height = s*maxh();
  if (int(s) == s) { // use win size increment value only if scale is an integer. Is it possible to do better?
    hints->width_inc = s*dw();
    hints->height_inc = s*dh();
  } else {
    hints->width_inc = 0;
    hints->height_inc = 0;
  }
  
  hints->win_gravity = StaticGravity;

  // see the file /usr/include/X11/Xm/MwmUtil.h:
  // fill all fields to avoid bugs in kwm and perhaps other window managers:
  // 0, MWM_FUNC_ALL, MWM_DECOR_ALL
  long prop[5] = {0, 1, 1, 0, 0};

  if (hints->min_width != hints->max_width ||
      hints->min_height != hints->max_height) { // resizable
    hints->flags = PMinSize|PWinGravity;
    if (hints->max_width >= hints->min_width ||
        hints->max_height >= hints->min_height) {
      hints->flags = PMinSize|PMaxSize|PWinGravity;
      // unfortunately we can't set just one maximum size.  Guess a
      // value for the other one.  Some window managers will make the
      // window fit on screen when maximized, others will put it off screen:
      if (hints->max_width < hints->min_width) hints->max_width = Fl::w()*s;
      if (hints->max_height < hints->min_height) hints->max_height = Fl::h()*s;
    }
    if (hints->width_inc && hints->height_inc) hints->flags |= PResizeInc;
    if (aspect()) {
      // stupid X!  It could insist that the corner go on the
      // straight line between min and max...
      hints->min_aspect.x = hints->max_aspect.x = hints->min_width;
      hints->min_aspect.y = hints->max_aspect.y = hints->min_height;
      hints->flags |= PAspect;
    }
  } else { // not resizable:
    hints->flags = PMinSize|PMaxSize|PWinGravity;
    prop[0] = 1; // MWM_HINTS_FUNCTIONS
    prop[1] = 1|2|16; // MWM_FUNC_ALL | MWM_FUNC_RESIZE | MWM_FUNC_MAXIMIZE
  }

  if (force_position()) {
    hints->flags |= USPosition;
    hints->x = s*w->x();
    hints->y = s*w->y();
  }

  if (!w->border()) {
    prop[0] |= 2; // MWM_HINTS_DECORATIONS
    prop[2] = 0; // no decorations
  }

  XSetWMNormalHints(fl_display, fl_xid(w), hints);
  XChangeProperty(fl_display, fl_xid(w),
                  fl_MOTIF_WM_HINTS, fl_MOTIF_WM_HINTS,
                  32, 0, (unsigned char *)prop, 5);
  XFree(hints);
}

////////////////////////////////////////////////////////////////

static unsigned long *default_net_wm_icons = 0L;
static size_t default_net_wm_icons_size = 0;

// Note: icons[] *must* contain at least <count> valid image pointers (!NULL),
//  but: <count> *may* be 0
static void icons_to_property(const Fl_RGB_Image *icons[], int count,
                              unsigned long **property, size_t *len) {
  size_t sz;
  unsigned long *data;

  sz = 0;
  for (int i = 0;i < count;i++)
    sz += 2 + icons[i]->w() * icons[i]->h();

  // FIXME: Might want to sort the icons

  *property = data = new unsigned long[sz];
  *len = sz;

  for (int i = 0;i < count;i++) {
    const Fl_RGB_Image *image;

    image = icons[i];

    data[0] = image->w();
    data[1] = image->h();
    data += 2;

    const int extra_data = image->ld() ? (image->ld()-image->w()*image->d()) : 0;

    const uchar *in = (const uchar*)*image->data();
    for (int y = 0; y < image->h(); y++) {
      for (int x = 0; x < image->w(); x++) {
        switch (image->d()) {
        case 1:
          *data = ( 0xff<<24) | (in[0]<<16) | (in[0]<<8) | in[0];
          break;
        case 2:
          *data = (in[1]<<24) | (in[0]<<16) | (in[0]<<8) | in[0];
          break;
        case 3:
          *data = ( 0xff<<24) | (in[0]<<16) | (in[1]<<8) | in[2];
          break;
        case 4:
          *data = (in[3]<<24) | (in[0]<<16) | (in[1]<<8) | in[2];
          break;
        }
        in += image->d();
        data++;
      }
      in += extra_data;
    }
  }
}

void Fl_Window_Driver::default_icons(const Fl_RGB_Image *icons[], int count) {
  if (default_net_wm_icons) {
    delete [] default_net_wm_icons;
    default_net_wm_icons = 0L;
    default_net_wm_icons_size = 0;
  }

  if (count > 0)
    icons_to_property(icons, count,
                      &default_net_wm_icons, &default_net_wm_icons_size);
}

void Fl_X11_Window_Driver::set_icons() {
  unsigned long *net_wm_icons;
  size_t net_wm_icons_size;

  if (icon_->count) {
    icons_to_property((const Fl_RGB_Image **)icon_->icons, icon_->count,
                      &net_wm_icons, &net_wm_icons_size);
  } else {
    net_wm_icons = default_net_wm_icons;
    net_wm_icons_size = default_net_wm_icons_size;
  }

  XChangeProperty (fl_display, fl_xid(pWindow), fl_NET_WM_ICON, XA_CARDINAL, 32,
      PropModeReplace, (unsigned char*) net_wm_icons, net_wm_icons_size);

  if (icon_->count) {
    delete [] net_wm_icons;
    net_wm_icons = 0L;
    net_wm_icons_size = 0;
  }
}

////////////////////////////////////////////////////////////////

int Fl_X11_Window_Driver::set_cursor(Fl_Cursor c) {

  /* The cursors are cached, because creating one takes 0.5ms including
     opening, reading, and closing theme files. They are kept until program
     exit by design, which valgrind will note as reachable. */
  static Cursor xc_arrow = None;
  static Cursor xc_cross = None;
  static Cursor xc_wait = None;
  static Cursor xc_insert = None;
  static Cursor xc_hand = None;
  static Cursor xc_help = None;
  static Cursor xc_move = None;
  static Cursor xc_ns = None;
  static Cursor xc_we = None;
  static Cursor xc_ne = None;
  static Cursor xc_n = None;
  static Cursor xc_nw = None;
  static Cursor xc_e = None;
  static Cursor xc_w = None;
  static Cursor xc_se = None;
  static Cursor xc_s = None;
  static Cursor xc_sw = None;

  Cursor xc;

#define cache_cursor(name, var) if (var == None) { \
                                  var = XCreateFontCursor(fl_display, name); \
                                } \
                                xc = var

  switch (c) {
  case FL_CURSOR_ARROW:   cache_cursor(XC_left_ptr, xc_arrow); break;
  case FL_CURSOR_CROSS:   cache_cursor(XC_tcross, xc_cross); break;
  case FL_CURSOR_WAIT:    cache_cursor(XC_watch, xc_wait); break;
  case FL_CURSOR_INSERT:  cache_cursor(XC_xterm, xc_insert); break;
  case FL_CURSOR_HAND:    cache_cursor(XC_hand2, xc_hand); break;
  case FL_CURSOR_HELP:    cache_cursor(XC_question_arrow, xc_help); break;
  case FL_CURSOR_MOVE:    cache_cursor(XC_fleur, xc_move); break;
  case FL_CURSOR_NS:      cache_cursor(XC_sb_v_double_arrow, xc_ns); break;
  case FL_CURSOR_WE:      cache_cursor(XC_sb_h_double_arrow, xc_we); break;
  case FL_CURSOR_NE:      cache_cursor(XC_top_right_corner, xc_ne); break;
  case FL_CURSOR_N:       cache_cursor(XC_top_side, xc_n); break;
  case FL_CURSOR_NW:      cache_cursor(XC_top_left_corner, xc_nw); break;
  case FL_CURSOR_E:       cache_cursor(XC_right_side, xc_e); break;
  case FL_CURSOR_W:       cache_cursor(XC_left_side, xc_w); break;
  case FL_CURSOR_SE:      cache_cursor(XC_bottom_right_corner, xc_se); break;
  case FL_CURSOR_S:       cache_cursor(XC_bottom_side, xc_s); break;
  case FL_CURSOR_SW:      cache_cursor(XC_bottom_left_corner, xc_sw); break;
  default:
    return 0;
  }

#undef cache_cursor

  XDefineCursor(fl_display, fl_xid(pWindow), xc);

  return 1;
}

int Fl_X11_Window_Driver::set_cursor(const Fl_RGB_Image *image, int hotx, int hoty) {
#if ! HAVE_XCURSOR
  return 0;
#else
  XcursorImage *cursor;
  Cursor xc;

  if ((hotx < 0) || (hotx >= image->w()))
    return 0;
  if ((hoty < 0) || (hoty >= image->h()))
    return 0;

  cursor = XcursorImageCreate(image->w(), image->h());
  if (!cursor)
    return 0;

  const int extra_data = image->ld() ? (image->ld()-image->w()*image->d()) : 0;
  const uchar *i = (const uchar*)*image->data();
  XcursorPixel *o = cursor->pixels;
  for (int y = 0;y < image->h();y++) {
    for (int x = 0;x < image->w();x++) {
      uchar r, g, b, a;
      switch (image->d()) {
      case 1:
        r = g = b = i[0];
        a = 0xff;
        break;
      case 2:
        r = g = b = i[0];
        a = i[1];
        break;
      case 3:
        r = i[0];
        g = i[1];
        b = i[2];
        a = 0xff;
        break;
      case 4:
        r = i[0];
        g = i[1];
        b = i[2];
        a = i[3];
        break;
      default:
        return 0;
      }
      // Alpha needs to be pre-multiplied for X11
      r = (uchar)((unsigned)r * a / 255);
      g = (uchar)((unsigned)g * a / 255);
      b = (uchar)((unsigned)b * a / 255);

      *o = (a<<24) | (r<<16) | (g<<8) | b;
      i += image->d();
      o++;
    }
    i += extra_data;
  }

  cursor->xhot = hotx;
  cursor->yhot = hoty;

  xc = XcursorImageLoadCursor(fl_display, cursor);
  XDefineCursor(fl_display, fl_xid(pWindow), xc);
  XFreeCursor(fl_display, xc);

  XcursorImageDestroy(cursor);

  return 1;
#endif
}

////////////////////////////////////////////////////////////////

// returns pointer to the filename, or null if name ends with '/'
const char *Fl_X11_System_Driver::filename_name(const char *name) {
  const char *p,*q;
  if (!name) return (0);
  for (p=q=name; *p;) if (*p++ == '/') q = p;
  return q;
}

void Fl_X11_Window_Driver::label(const char *name, const char *iname) {
  if (shown() && !parent()) {
    if (!name) name = "";
    int namelen = strlen(name);
    if (!iname) iname = fl_filename_name(name);
    int inamelen = strlen(iname);
    Window win = fl_xid(pWindow);
    XChangeProperty(fl_display, win, fl_NET_WM_NAME,      fl_XaUtf8String, 8, 0, (uchar*)name,  namelen);	// utf8
    XChangeProperty(fl_display, win, XA_WM_NAME,          XA_STRING,       8, 0, (uchar*)name,  namelen);	// non-utf8
    XChangeProperty(fl_display, win, fl_NET_WM_ICON_NAME, fl_XaUtf8String, 8, 0, (uchar*)iname, inamelen);	// utf8
    XChangeProperty(fl_display, win, XA_WM_ICON_NAME,     XA_STRING,       8, 0, (uchar*)iname, inamelen);	// non-utf8
  }
}

////////////////////////////////////////////////////////////////
// Implement the virtual functions for the base Fl_Window class:

// If the box is a filled rectangle, we can make the redisplay *look*
// faster by using X's background pixel erasing.  We can make it
// actually *be* faster by drawing the frame only, this is done by
// setting fl_boxcheat, which is seen by code in fl_drawbox.cxx:
//
// On XFree86 (and prehaps all X's) this has a problem if the window
// is resized while a save-behind window is atop it.  The previous
// contents are restored to the area, but this assumes the area
// is cleared to background color.  So this is disabled in this version.
// Fl_Window *fl_boxcheat;
static inline int can_boxcheat(uchar b) {return (b==1 || ((b&2) && b<=15));}

void Fl_X11_Window_Driver::show() {
  if (!shown()) {
    fl_open_display();
    // Don't set background pixel for double-buffered windows...
    if (pWindow->type() != FL_DOUBLE_WINDOW && can_boxcheat(pWindow->box())) {
      fl_background_pixel = int(fl_xpixel(pWindow->color()));
    }
    makeWindow();
  } else {
    XMapRaised(fl_display, fl_xid(pWindow));
  }
}


//#define USE_PRINT_BUTTON 1
#ifdef USE_PRINT_BUTTON

// to test the Fl_Printer class creating a "Print front window" button in a separate window
#include <FL/Fl_Printer.H>
#include <FL/Fl_Button.H>

void printFront(Fl_Widget *o, void *data)
{
  Fl_Printer printer;
  o->window()->hide();
  Fl_Window *win = Fl::first_window();
  if(!win) return;
  int w, h;
  if( printer.begin_job(1) ) { o->window()->show(); return; }
  if( printer.begin_page() ) { o->window()->show(); return; }
  printer.printable_rect(&w,&h);
  // scale the printer device so that the window fits on the page
  float scale = 1;
  int ww = win->decorated_w();
  int wh = win->decorated_h();
  if (ww > w || wh > h) {
    scale = (float)w/ww;
    if ((float)h/wh < scale) scale = (float)h/wh;
    printer.scale(scale, scale);
  }

// #define ROTATE 20.0
#ifdef ROTATE
  printer.scale(scale * 0.8, scale * 0.8);
  printer.printable_rect(&w, &h);
  printer.origin(w/2, h/2 );
  printer.rotate(ROTATE);
  printer.print_widget( win, - win->w()/2, - win->h()/2 );
  //printer.print_window_part( win, 0,0, win->w(), win->h(), - win->w()/2, - win->h()/2 );
#else  
  printer.print_window(win);
  //printer.print_window_part( win, 0,0, win->w(), win->h(), 0,0 );
#endif

  printer.end_page();
  printer.end_job();
  o->window()->show();
}

#include <FL/Fl_Copy_Surface.H>
void copyFront(Fl_Widget *o, void *data)
{
  o->window()->hide();
  Fl_Window *win = Fl::first_window();
  if (!win) return;
  Fl_Copy_Surface *surf = new Fl_Copy_Surface(win->decorated_w(), win->decorated_h());
  Fl_Surface_Device::push_current(surf);
  surf->draw_decorated_window(win); // draw the window content
  Fl_Surface_Device::pop_current();
  delete surf; // put the window on the clipboard
  o->window()->show();
}

static int prepare_print_button() {
  static Fl_Window w(0,0,140,60);
  static Fl_Button bp(0,0,w.w(),30, "Print front window");
  bp.callback(printFront);
  static Fl_Button bc(0,30,w.w(),30, "Copy front window");
  bc.callback(copyFront);
  w.end();
  w.show();
  return 0;
}

static int unused = prepare_print_button();

#endif // USE_PRINT_BUTTON

#endif // !defined(FL_DOXYGEN)

//
// End of "$Id$".
//
