/*
 * Xephyr - A kdrive X server thats runs in a host X window.
 *          Authored by Matthew Allum <mallum@openedhand.com>
 * 
 * Copyright © 2004 Nokia 
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Nokia not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission. Nokia makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * NOKIA DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL NOKIA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#ifdef HAVE_CONFIG_H
#include <kdrive-config.h>
#endif
#include "ephyr.h"

#include "inputstr.h"
#include "scrnintstr.h"
#include "ephyrlog.h"

#ifdef XF86DRI
#include "ephyrdri.h"
#include "ephyrdriext.h"
#include "ephyrglxext.h"
#endif /* XF86DRI */

#include "xkbsrv.h"

extern int KdTsPhyScreen;
#ifdef GLXEXT
extern Bool noGlxVisualInit;
#endif

KdKeyboardInfo *ephyrKbd;
KdPointerInfo *ephyrMouse;
EphyrKeySyms ephyrKeySyms;
Bool ephyrNoDRI=FALSE ;
Bool ephyrNoXV=FALSE ;

static int mouseState = 0;

typedef struct _EphyrInputPrivate {
    Bool    enabled;
} EphyrKbdPrivate, EphyrPointerPrivate;

Bool   EphyrWantGrayScale = 0;


Bool
ephyrInitialize (KdCardInfo *card, EphyrPriv *priv)
{
  OsSignal(SIGUSR1, hostx_handle_signal);
  
  priv->base = 0;
  priv->bytes_per_line = 0;
  return TRUE;
}

Bool
ephyrCardInit (KdCardInfo *card)
{
  EphyrPriv	*priv;
  
  priv = (EphyrPriv *) malloc(sizeof (EphyrPriv));
  if (!priv)
    return FALSE;
  
  if (!ephyrInitialize (card, priv))
    {
      free(priv);
      return FALSE;
    }
  card->driver = priv;
  
  return TRUE;
}

Bool
ephyrScreenInitialize (KdScreenInfo *screen, EphyrScrPriv *scrpriv)
{
  int width = 640, height = 480; 
  CARD32 redMask, greenMask, blueMask;
  
  if (hostx_want_screen_size(screen, &width, &height)
      || !screen->width || !screen->height)
    {
      screen->width = width;
      screen->height = height;
    }

  if (EphyrWantGrayScale)
    screen->fb.depth = 8;

  if (screen->fb.depth && screen->fb.depth != hostx_get_depth())
    {
      if (screen->fb.depth < hostx_get_depth()
	  && (screen->fb.depth == 24 || screen->fb.depth == 16
	      || screen->fb.depth == 8))
	{
	  hostx_set_server_depth(screen, screen->fb.depth);
	}
      else
	ErrorF("\nXephyr: requested screen depth not supported, setting to match hosts.\n");
    }
  
  screen->fb.depth = hostx_get_server_depth(screen);
  screen->rate = 72;
  
  if (screen->fb.depth <= 8)
    {
      if (EphyrWantGrayScale)
	screen->fb.visuals = ((1 << StaticGray) | (1 << GrayScale));
      else
	screen->fb.visuals = ((1 << StaticGray) |
			      (1 << GrayScale) |
			      (1 << StaticColor) |
			      (1 << PseudoColor) |
			      (1 << TrueColor) |
			      (1 << DirectColor));
      
      screen->fb.redMask   = 0x00;
      screen->fb.greenMask = 0x00;
      screen->fb.blueMask  = 0x00;
      screen->fb.depth        = 8;
      screen->fb.bitsPerPixel = 8;
    }
  else 
    {
      screen->fb.visuals = (1 << TrueColor);
      
      if (screen->fb.depth <= 15)
	{
	  screen->fb.depth = 15;
	  screen->fb.bitsPerPixel = 16;
	}
      else if (screen->fb.depth <= 16)
	{
	  screen->fb.depth = 16;
	  screen->fb.bitsPerPixel = 16;
	}
      else if (screen->fb.depth <= 24)
	{
	  screen->fb.depth = 24;
	  screen->fb.bitsPerPixel = 32;
	}
      else if (screen->fb.depth <= 30)
	{
	  screen->fb.depth = 30;
	  screen->fb.bitsPerPixel = 32;
	}
      else
	{
	  ErrorF("\nXephyr: Unsupported screen depth %d\n",
	         screen->fb.depth);
	  return FALSE;
	}

      hostx_get_visual_masks (screen, &redMask, &greenMask, &blueMask);

      screen->fb.redMask = (Pixel) redMask;
      screen->fb.greenMask = (Pixel) greenMask;
      screen->fb.blueMask = (Pixel) blueMask;

    }
  
  scrpriv->randr = screen->randr;

  return ephyrMapFramebuffer (screen);
}

Bool
ephyrScreenInit (KdScreenInfo *screen)
{
  EphyrScrPriv *scrpriv;
  
  scrpriv = calloc(1, sizeof (EphyrScrPriv));

  if (!scrpriv)
    return FALSE;

  screen->driver = scrpriv;

  if (!ephyrScreenInitialize (screen, scrpriv))
    {
      screen->driver = 0;
      free(scrpriv);
      return FALSE;
    }

  return TRUE;
}
    
void*
ephyrWindowLinear (ScreenPtr	pScreen,
		   CARD32	row,
		   CARD32	offset,
		   int		mode,
		   CARD32	*size,
		   void		*closure)
{
  KdScreenPriv(pScreen);
  EphyrPriv	    *priv = pScreenPriv->card->driver;
  
  if (!pScreenPriv->enabled)
    return 0;

  *size = priv->bytes_per_line;
  return priv->base + row * priv->bytes_per_line + offset;
}

/**
 * Figure out display buffer size. If fakexa is enabled, allocate a larger
 * buffer so that fakexa has space to put offscreen pixmaps.
 */
int
ephyrBufferHeight(KdScreenInfo *screen)
{
    int buffer_height;
    if (ephyrFuncs.initAccel == NULL)
	buffer_height = screen->height;
    else
	buffer_height = 3 * screen->height;
    return buffer_height;
}


Bool
ephyrMapFramebuffer (KdScreenInfo *screen)
{
  EphyrScrPriv  *scrpriv = screen->driver;
  EphyrPriv	  *priv    = screen->card->driver;
  KdPointerMatrix m;
  int buffer_height;
  
  EPHYR_LOG("screen->width: %d, screen->height: %d index=%d",
	     screen->width, screen->height, screen->mynum);
  
  KdComputePointerMatrix (&m, scrpriv->randr, screen->width, screen->height);
  KdSetPointerMatrix (&m);
  
  priv->bytes_per_line = ((screen->width * screen->fb.bitsPerPixel + 31) >> 5) << 2;

  buffer_height = ephyrBufferHeight(screen);

  priv->base = hostx_screen_init (screen, screen->width, screen->height, buffer_height);

  if ((scrpriv->randr & RR_Rotate_0) && !(scrpriv->randr & RR_Reflect_All))
    {
      scrpriv->shadow = FALSE;
      
      screen->fb.byteStride = priv->bytes_per_line;
      screen->fb.pixelStride = screen->width;
      screen->fb.frameBuffer = (CARD8 *) (priv->base);
    }
  else
    {
      /* Rotated/Reflected so we need to use shadow fb */
      scrpriv->shadow = TRUE;
      
      EPHYR_LOG("allocing shadow");
      
      KdShadowFbAlloc (screen,
		       scrpriv->randr & (RR_Rotate_90|RR_Rotate_270));
    }
  
  return TRUE;
}

void
ephyrSetScreenSizes (ScreenPtr pScreen)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen = pScreenPriv->screen;
  EphyrScrPriv	*scrpriv = screen->driver;
  
  if (scrpriv->randr & (RR_Rotate_0|RR_Rotate_180))
    {
      pScreen->width = screen->width;
      pScreen->height = screen->height;
      pScreen->mmWidth = screen->width_mm;
      pScreen->mmHeight = screen->height_mm;
    }
  else 
    {
      pScreen->width = screen->height;
      pScreen->height = screen->width;
      pScreen->mmWidth = screen->height_mm;
      pScreen->mmHeight = screen->width_mm;
    }
}

Bool
ephyrUnmapFramebuffer (KdScreenInfo *screen)
{
  EphyrScrPriv  *scrpriv = screen->driver;
  
  if (scrpriv->shadow)
    KdShadowFbFree (screen);
  
  /* Note, priv->base will get freed when XImage recreated */
  
  return TRUE;
}

void 
ephyrShadowUpdate (ScreenPtr pScreen, shadowBufPtr pBuf)
{
  KdScreenPriv(pScreen);
  KdScreenInfo *screen = pScreenPriv->screen;
  
  EPHYR_LOG("slow paint");
  
  /* FIXME: Slow Rotated/Reflected updates could be much
   * much faster efficiently updating via tranforming 
   * pBuf->pDamage  regions     
  */
  shadowUpdateRotatePacked(pScreen, pBuf);
  hostx_paint_rect(screen, 0,0,0,0, screen->width, screen->height);
}

static void
ephyrInternalDamageRedisplay (ScreenPtr pScreen)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen = pScreenPriv->screen;
  EphyrScrPriv	*scrpriv = screen->driver;
  RegionPtr	 pRegion;

  if (!scrpriv || !scrpriv->pDamage)
    return;

  pRegion = DamageRegion (scrpriv->pDamage);

  if (RegionNotEmpty(pRegion))
    {
      int           nbox;
      BoxPtr        pbox;

      nbox = RegionNumRects (pRegion);
      pbox = RegionRects (pRegion);

      while (nbox--)
        {
          hostx_paint_rect(screen,
                           pbox->x1, pbox->y1,
                           pbox->x1, pbox->y1,
                           pbox->x2 - pbox->x1,
                           pbox->y2 - pbox->y1);
          pbox++;
        }
      DamageEmpty (scrpriv->pDamage);
    }
}

static void
ephyrInternalDamageBlockHandler (pointer   data,
				 OSTimePtr pTimeout,
				 pointer   pRead)
{
  ScreenPtr pScreen = (ScreenPtr) data;
  
  ephyrInternalDamageRedisplay (pScreen);
}

static void
ephyrInternalDamageWakeupHandler (pointer data, int i, pointer LastSelectMask)
{
  /* FIXME: Not needed ? */
}

Bool
ephyrSetInternalDamage (ScreenPtr pScreen)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen = pScreenPriv->screen;
  EphyrScrPriv	*scrpriv = screen->driver;
  PixmapPtr      pPixmap = NULL;
  
  scrpriv->pDamage = DamageCreate ((DamageReportFunc) 0,
				   (DamageDestroyFunc) 0,
				   DamageReportNone,
				   TRUE,
				   pScreen,
				   pScreen);
  
  if (!RegisterBlockAndWakeupHandlers (ephyrInternalDamageBlockHandler,
				       ephyrInternalDamageWakeupHandler,
				       (pointer) pScreen))
    return FALSE;
  
  pPixmap = (*pScreen->GetScreenPixmap) (pScreen);
  
  DamageRegister (&pPixmap->drawable, scrpriv->pDamage);
      
  return TRUE;
}

void
ephyrUnsetInternalDamage (ScreenPtr pScreen)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen = pScreenPriv->screen;
  EphyrScrPriv	*scrpriv = screen->driver;
  PixmapPtr      pPixmap = NULL;
  
  pPixmap = (*pScreen->GetScreenPixmap) (pScreen);
  DamageUnregister (&pPixmap->drawable, scrpriv->pDamage);
  DamageDestroy (scrpriv->pDamage);
  
  RemoveBlockAndWakeupHandlers (ephyrInternalDamageBlockHandler,
				ephyrInternalDamageWakeupHandler,
				(pointer) pScreen);
}

#ifdef RANDR
Bool
ephyrRandRGetInfo (ScreenPtr pScreen, Rotation *rotations)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	    *screen = pScreenPriv->screen;
  EphyrScrPriv	    *scrpriv = screen->driver;
  RRScreenSizePtr	    pSize;
  Rotation		    randr;
  int			    n = 0;
 
  struct { int width, height; } sizes[] = 
    {
      { 1600, 1200 },
      { 1400, 1050 },
      { 1280, 960  },
      { 1280, 1024 },
      { 1152, 864 },
      { 1024, 768 },
      { 832, 624 },
      { 800, 600 },
      { 720, 400 },
      { 480, 640 },
      { 640, 480 },
      { 640, 400 },
      { 320, 240 },
      { 240, 320 },
      { 160, 160 }, 
      { 0, 0 }
    };

  EPHYR_LOG("mark");

  *rotations = RR_Rotate_All|RR_Reflect_All;

  if (!hostx_want_preexisting_window (screen)
      && !hostx_want_fullscreen ()) /* only if no -parent switch */
    {
      while (sizes[n].width != 0 && sizes[n].height != 0)
	{
	  RRRegisterSize (pScreen,
			  sizes[n].width,
			  sizes[n].height, 
			  (sizes[n].width * screen->width_mm)/screen->width,
			  (sizes[n].height *screen->height_mm)/screen->height
			  );
	  n++;
	}
    }
  
  pSize = RRRegisterSize (pScreen,
			  screen->width,
			  screen->height, 
			  screen->width_mm,
			  screen->height_mm);
    
  randr = KdSubRotation (scrpriv->randr, screen->randr);
  
  RRSetCurrentConfig (pScreen, randr, 0, pSize);
    
  return TRUE;
}

Bool
ephyrRandRSetConfig (ScreenPtr		pScreen,
		     Rotation		randr,
		     int		rate,
		     RRScreenSizePtr	pSize)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen    = pScreenPriv->screen;
  EphyrScrPriv	*scrpriv   = screen->driver;
  Bool		wasEnabled = pScreenPriv->enabled;
  EphyrScrPriv	oldscr;
  int		oldwidth, oldheight, oldmmwidth, oldmmheight;
  Bool          oldshadow;
  int		newwidth, newheight;
  
  if (screen->randr & (RR_Rotate_0|RR_Rotate_180))
    {
      newwidth = pSize->width;
      newheight = pSize->height;
    }
  else
    {
      newwidth = pSize->height;
      newheight = pSize->width;
    }
  
  if (wasEnabled)
    KdDisableScreen (pScreen);

  oldscr = *scrpriv;
    
  oldwidth    = screen->width;
  oldheight   = screen->height;
  oldmmwidth  = pScreen->mmWidth;
  oldmmheight = pScreen->mmHeight;
  oldshadow   = scrpriv->shadow;
  
  /*
   * Set new configuration
   */
  
  scrpriv->randr = KdAddRotation (screen->randr, randr);
  
  ephyrUnmapFramebuffer (screen); 
  
  screen->width  = newwidth;
  screen->height = newheight;
  
  if (!ephyrMapFramebuffer (screen))
    goto bail4;
  
  /* FIXME below should go in own call */
  
  if (oldshadow)
    KdShadowUnset (screen->pScreen);
  else
    ephyrUnsetInternalDamage(screen->pScreen);
  
  if (scrpriv->shadow)
    {
      if (!KdShadowSet (screen->pScreen, 
			scrpriv->randr, 
			ephyrShadowUpdate, 
			ephyrWindowLinear))
	goto bail4;
    }
  else
    {
      /* Without shadow fb ( non rotated ) we need 
       * to use damage to efficiently update display
       * via signal regions what to copy from 'fb'.
       */
      if (!ephyrSetInternalDamage(screen->pScreen))
	goto bail4;
    }
  
  ephyrSetScreenSizes (screen->pScreen);
  
  /*
   * Set frame buffer mapping
   */
  (*pScreen->ModifyPixmapHeader) (fbGetScreenPixmap (pScreen),
				  pScreen->width,
				  pScreen->height,
				  screen->fb.depth,
				  screen->fb.bitsPerPixel,
				  screen->fb.byteStride,
				  screen->fb.frameBuffer);
  
  /* set the subpixel order */
  
  KdSetSubpixelOrder (pScreen, scrpriv->randr);
  
  if (wasEnabled)
    KdEnableScreen (pScreen);
  
  return TRUE;
  
 bail4:
  EPHYR_LOG("bailed");
  
  ephyrUnmapFramebuffer (screen);
  *scrpriv = oldscr;
  (void) ephyrMapFramebuffer (screen);
  
  pScreen->width = oldwidth;
  pScreen->height = oldheight;
  pScreen->mmWidth = oldmmwidth;
  pScreen->mmHeight = oldmmheight;
  
  if (wasEnabled)
    KdEnableScreen (pScreen);
  return FALSE;
}

Bool
ephyrRandRInit (ScreenPtr pScreen)
{
  rrScrPrivPtr    pScrPriv;
  
  if (!RRScreenInit (pScreen))
    return FALSE;
  
  pScrPriv = rrGetScrPriv(pScreen);
  pScrPriv->rrGetInfo = ephyrRandRGetInfo;
  pScrPriv->rrSetConfig = ephyrRandRSetConfig;
  return TRUE;
}
#endif

Bool
ephyrCreateColormap (ColormapPtr pmap)
{
  return fbInitializeColormap (pmap);
}

Bool
ephyrInitScreen (ScreenPtr pScreen)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen    = pScreenPriv->screen;

  EPHYR_LOG ("pScreen->myNum:%d\n", pScreen->myNum) ;
  hostx_set_screen_number (screen, pScreen->myNum);
  hostx_set_win_title (screen, "(ctrl+shift grabs mouse and keyboard)") ;
  pScreen->CreateColormap = ephyrCreateColormap;

#ifdef XV
  if (!ephyrNoXV) {
      if (!ephyrInitVideo (pScreen)) {
          EPHYR_LOG_ERROR ("failed to initialize xvideo\n") ;
      } else {
          EPHYR_LOG ("initialized xvideo okay\n") ;
      }
  }
#endif /*XV*/

#ifdef XF86DRI
  if (!ephyrNoDRI && !hostx_has_dri ()) {
      EPHYR_LOG ("host x does not support DRI. Disabling DRI forwarding\n") ;
      ephyrNoDRI = TRUE ;
#ifdef GLXEXT
      noGlxVisualInit = FALSE ;
#endif
  }
  if (!ephyrNoDRI) {
    ephyrDRIExtensionInit (pScreen) ;
    ephyrHijackGLXExtension () ;
  }
#endif

#ifdef GLXEXT
  if (ephyrNoDRI) {
      noGlxVisualInit = FALSE ;
  }
#endif

  return TRUE;
}

Bool
ephyrFinishInitScreen (ScreenPtr pScreen)
{
  /* FIXME: Calling this even if not using shadow.  
   * Seems harmless enough. But may be safer elsewhere.
   */
  if (!shadowSetup (pScreen))
    return FALSE;

#ifdef RANDR
  if (!ephyrRandRInit (pScreen))
    return FALSE;
#endif

  return TRUE;
}

Bool
ephyrCreateResources (ScreenPtr pScreen)
{
  KdScreenPriv(pScreen);
  KdScreenInfo	*screen    = pScreenPriv->screen;
  EphyrScrPriv	*scrpriv   = screen->driver;

  EPHYR_LOG("mark pScreen=%p mynum=%d shadow=%d",
            pScreen, pScreen->myNum, scrpriv->shadow);

  if (scrpriv->shadow) 
    return KdShadowSet (pScreen, 
			scrpriv->randr, 
			ephyrShadowUpdate, 
			ephyrWindowLinear);
  else
    return ephyrSetInternalDamage(pScreen); 
}

void
ephyrPreserve (KdCardInfo *card)
{
}

Bool
ephyrEnable (ScreenPtr pScreen)
{
  return TRUE;
}

Bool
ephyrDPMS (ScreenPtr pScreen, int mode)
{
  return TRUE;
}

void
ephyrDisable (ScreenPtr pScreen)
{
}

void
ephyrRestore (KdCardInfo *card)
{
}

void
ephyrScreenFini (KdScreenInfo *screen)
{
    EphyrScrPriv  *scrpriv = screen->driver;
    if (scrpriv->shadow) {
        KdShadowFbFree (screen);
    }
    free(screen->driver);
    screen->driver = NULL;
}

/*  
 * Port of Mark McLoughlin's Xnest fix for focus in + modifier bug.
 * See https://bugs.freedesktop.org/show_bug.cgi?id=3030
 */
void
ephyrUpdateModifierState(unsigned int state)
{

  DeviceIntPtr pDev = inputInfo.keyboard;
  KeyClassPtr keyc = pDev->key;
  int i;
  CARD8 mask;
  int xkb_state;
  
  if (!pDev)
      return;

  xkb_state = XkbStateFieldFromRec(&pDev->key->xkbInfo->state);
  state = state & 0xff;

  if (xkb_state == state)
    return;
      
  for (i = 0, mask = 1; i < 8; i++, mask <<= 1) {
    int key;

    /* Modifier is down, but shouldn't be
     */
    if ((xkb_state & mask) && !(state & mask)) {
      int count = keyc->modifierKeyCount[i];

      for (key = 0; key < MAP_LENGTH; key++)
        if (keyc->xkbInfo->desc->map->modmap[key] & mask) {
          if (key_is_down(pDev, key, KEY_PROCESSED))
	        KdEnqueueKeyboardEvent (ephyrKbd, key, TRUE);

          if (--count == 0)
            break;
        }
    }

    /* Modifier shoud be down, but isn't
     */
    if (!(xkb_state & mask) && (state & mask))
      for (key = 0; key < MAP_LENGTH; key++)
        if (keyc->xkbInfo->desc->map->modmap[key] & mask) {
	        KdEnqueueKeyboardEvent (ephyrKbd, key, FALSE);
          break;
        }
  }
}

static void
ephyrBlockSigio (void)
{
    sigset_t set;

    sigemptyset (&set);
    sigaddset (&set, SIGIO);
    sigprocmask (SIG_BLOCK, &set, 0);
}

static void
ephyrUnblockSigio (void)
{
    sigset_t set;

    sigemptyset (&set);
    sigaddset (&set, SIGIO);
    sigprocmask (SIG_UNBLOCK, &set, 0);
}

static Bool
ephyrCursorOffScreen(ScreenPtr *ppScreen, int *x, int *y)
{
  return FALSE;
}

static void
ephyrCrossScreen (ScreenPtr pScreen, Bool entering)
{
}

int ephyrCurScreen; /*current event screen*/

static void
ephyrWarpCursor (DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y)
{
    ephyrBlockSigio ();
    ephyrCurScreen = pScreen->myNum;
    miPointerWarpCursor (inputInfo.pointer, pScreen, x, y);
    ephyrUnblockSigio ();
}

miPointerScreenFuncRec ephyrPointerScreenFuncs =
{
  ephyrCursorOffScreen,
  ephyrCrossScreen,
  ephyrWarpCursor,
  NULL,
  NULL
};

#ifdef XF86DRI
/**
 * find if the remote window denoted by a_remote
 * is paired with an internal Window within the Xephyr server.
 * If the remove window is paired with an internal window, send an
 * expose event to the client insterested in the internal window expose event.
 *
 * Pairing happens when a drawable inside Xephyr is associated with
 * a GL surface in a DRI environment.
 * Look at the function ProcXF86DRICreateDrawable in ephyrdriext.c to
 * know a paired window is created.
 *
 * This is useful to make GL drawables (only windows for now) handle
 * expose events and send those events to clients.
 */
static void
ephyrExposePairedWindow (int a_remote)
{
    EphyrWindowPair *pair = NULL;
    RegionRec reg;
    ScreenPtr screen;

    if (!findWindowPairFromRemote (a_remote, &pair)) {
	EPHYR_LOG ("did not find a pair for this window\n");
	return;
    }
    screen = pair->local->drawable.pScreen;
    RegionNull(&reg);
    RegionCopy(&reg, &pair->local->clipList);
    screen->WindowExposures (pair->local, &reg, NullRegion);
    RegionUninit(&reg);
}
#endif /* XF86DRI */

void
ephyrPoll(void)
{
  EphyrHostXEvent ev;

  while (hostx_get_event(&ev))
    {
      switch (ev.type)
        {
        case EPHYR_EV_MOUSE_MOTION:
          if (!ephyrMouse ||
              !((EphyrPointerPrivate *)ephyrMouse->driverPrivate)->enabled) {
              EPHYR_LOG ("skipping mouse motion:%d\n", ephyrCurScreen) ;
              continue;
          }
          {
            if (ev.data.mouse_motion.screen >=0
                && (ephyrCurScreen != ev.data.mouse_motion.screen))
              {
                  EPHYR_LOG ("warping mouse cursor. "
                             "cur_screen%d, motion_screen:%d\n",
                             ephyrCurScreen, ev.data.mouse_motion.screen) ;
                  if (ev.data.mouse_motion.screen >= 0)
                    {
                      ephyrWarpCursor
                            (inputInfo.pointer, screenInfo.screens[ev.data.mouse_motion.screen],
                             ev.data.mouse_motion.x,
                             ev.data.mouse_motion.y );
                    }
              }
            else
              {
                  int x=0, y=0;
#ifdef XF86DRI
                  EphyrWindowPair *pair = NULL;
#endif
                  EPHYR_LOG ("enqueuing mouse motion:%d\n", ephyrCurScreen) ;
                  x = ev.data.mouse_motion.x;
                  y = ev.data.mouse_motion.y;
                  EPHYR_LOG ("initial (x,y):(%d,%d)\n", x, y) ;
#ifdef XF86DRI
                  EPHYR_LOG ("is this window peered by a gl drawable ?\n") ;
                  if (findWindowPairFromRemote (ev.data.mouse_motion.window,
                                                &pair))
                    {
                        EPHYR_LOG ("yes, it is peered\n") ;
                        x += pair->local->drawable.x;
                        y += pair->local->drawable.y;
                    }
                  else
                    {
                        EPHYR_LOG ("no, it is not peered\n") ;
                    }
                  EPHYR_LOG ("final (x,y):(%d,%d)\n", x, y) ;
#endif
                  KdEnqueuePointerEvent(ephyrMouse, mouseState, x, y, 0);
              }
          }
          break;

        case EPHYR_EV_MOUSE_PRESS:
          if (!ephyrMouse ||
              !((EphyrPointerPrivate *)ephyrMouse->driverPrivate)->enabled) {
              EPHYR_LOG ("skipping mouse press:%d\n", ephyrCurScreen) ;
              continue;
          }
          EPHYR_LOG ("enqueuing mouse press:%d\n", ephyrCurScreen) ;
	  ephyrUpdateModifierState(ev.key_state);
	  mouseState |= ev.data.mouse_down.button_num;
	  KdEnqueuePointerEvent(ephyrMouse, mouseState|KD_MOUSE_DELTA, 0, 0, 0);
	  break;

	case EPHYR_EV_MOUSE_RELEASE:
          if (!ephyrMouse ||
              !((EphyrPointerPrivate *)ephyrMouse->driverPrivate)->enabled)
              continue;
	  ephyrUpdateModifierState(ev.key_state);
	  mouseState &= ~ev.data.mouse_up.button_num;
          EPHYR_LOG ("enqueuing mouse release:%d\n", ephyrCurScreen) ;
	  KdEnqueuePointerEvent(ephyrMouse, mouseState|KD_MOUSE_DELTA, 0, 0, 0);
	  break;

	case EPHYR_EV_KEY_PRESS:
          if (!ephyrKbd ||
              !((EphyrKbdPrivate *)ephyrKbd->driverPrivate)->enabled)
              continue;
	  ephyrUpdateModifierState(ev.key_state);
	  KdEnqueueKeyboardEvent (ephyrKbd, ev.data.key_down.scancode, FALSE);
	  break;

	case EPHYR_EV_KEY_RELEASE:
          if (!ephyrKbd ||
              !((EphyrKbdPrivate *)ephyrKbd->driverPrivate)->enabled)
              continue;
	  ephyrUpdateModifierState(ev.key_state);
	  KdEnqueueKeyboardEvent (ephyrKbd, ev.data.key_up.scancode, TRUE);
	  break;

#ifdef XF86DRI
	case EPHYR_EV_EXPOSE:
	  /*
	   * We only receive expose events when the expose event have
	   * be generated for a drawable that is a host X window managed
	   * by Xephyr. Host X windows managed by Xephyr exists for instance
	   * when Xephyr is asked to create a GL drawable in a DRI environment.
	   */
	  ephyrExposePairedWindow (ev.data.expose.window);
	  break;
#endif /* XF86DRI */

	default:
	  break;
	}
    }
}

void
ephyrCardFini (KdCardInfo *card)
{
  EphyrPriv	*priv = card->driver;
  free(priv);
}

void
ephyrGetColors (ScreenPtr pScreen, int n, xColorItem *pdefs)
{
  /* XXX Not sure if this is right */
  
  EPHYR_LOG("mark");
  
  while (n--)
    {
      pdefs->red = 0;
      pdefs->green = 0;
      pdefs->blue = 0;
      pdefs++;
    }

}

void
ephyrPutColors (ScreenPtr pScreen, int n, xColorItem *pdefs)
{
  int min, max, p;

  /* XXX Not sure if this is right */

  min = 256;
  max = 0;
  
  while (n--)
    {
      p = pdefs->pixel;
      if (p < min)
	min = p;
      if (p > max)
	max = p;

      hostx_set_cmap_entry(p, 		
			   pdefs->red >> 8,
			   pdefs->green >> 8,
			   pdefs->blue >> 8);
      pdefs++;
    }
}

/* Mouse calls */

static Status
MouseInit (KdPointerInfo *pi)
{
    pi->driverPrivate = (EphyrPointerPrivate *)
                         calloc(sizeof(EphyrPointerPrivate), 1);
    ((EphyrPointerPrivate *)pi->driverPrivate)->enabled = FALSE;
    pi->nAxes = 3;
    pi->nButtons = 32;
    free(pi->name);
    pi->name = strdup("Xephyr virtual mouse");
    ephyrMouse = pi;
    return Success;
}

static Status
MouseEnable (KdPointerInfo *pi)
{
    ((EphyrPointerPrivate *)pi->driverPrivate)->enabled = TRUE;
    return Success;
}

static void
MouseDisable (KdPointerInfo *pi)
{
    ((EphyrPointerPrivate *)pi->driverPrivate)->enabled = FALSE;
    return;
}

static void
MouseFini (KdPointerInfo *pi)
{
    ephyrMouse = NULL; 
    return;
}

KdPointerDriver EphyrMouseDriver = {
    "ephyr",
    MouseInit,
    MouseEnable,
    MouseDisable,
    MouseFini,
    NULL,
};

/* Keyboard */

static Status
EphyrKeyboardInit (KdKeyboardInfo *ki)
{
  ki->driverPrivate = (EphyrKbdPrivate *)
                       calloc(sizeof(EphyrKbdPrivate), 1);
  hostx_load_keymap();
  if (!ephyrKeySyms.map) {
      ErrorF("Couldn't load keymap from host\n");
      return BadAlloc;
  }
  ki->minScanCode = ephyrKeySyms.minKeyCode;
  ki->maxScanCode = ephyrKeySyms.maxKeyCode;
  free(ki->name);
  ki->name = strdup("Xephyr virtual keyboard");
  ephyrKbd = ki;
  return Success;
}

static Status
EphyrKeyboardEnable (KdKeyboardInfo *ki)
{
    ((EphyrKbdPrivate *)ki->driverPrivate)->enabled = TRUE;

    return Success;
}

static void
EphyrKeyboardDisable (KdKeyboardInfo *ki)
{
    ((EphyrKbdPrivate *)ki->driverPrivate)->enabled = FALSE;
}

static void
EphyrKeyboardFini (KdKeyboardInfo *ki)
{
    ephyrKbd = NULL;
    return;
}

static void
EphyrKeyboardLeds (KdKeyboardInfo *ki, int leds)
{
}

static void
EphyrKeyboardBell (KdKeyboardInfo *ki, int volume, int frequency, int duration)
{
}


KdKeyboardDriver EphyrKeyboardDriver = {
    "ephyr",
    EphyrKeyboardInit,
    EphyrKeyboardEnable,
    EphyrKeyboardLeds,
    EphyrKeyboardBell,
    EphyrKeyboardDisable,
    EphyrKeyboardFini,
    NULL,
};
