/*
 * X11DRV OEM bitmap objects
 *
 * Copyright 1994, 1995 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#include "windef.h"
#include "winbase.h"
#include "x11drv.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(palette);

/* Palette indexed mode:
 *	logical palette -> mapping -> pixel
 *
 *
 * Windows needs contiguous color space ( from 0 to n ) but
 * it is possible only with the private colormap. Otherwise we
 * have to map DC palette indices to real pixel values. With
 * private colormaps it boils down to the identity mapping. The
 * other special case is when we have a fixed color visual with
 * the screendepth > 8 - we abandon palette mappings altogether
 * because pixel values can be calculated without X server
 * assistance.
 */

#define NB_RESERVED_COLORS     20   /* number of fixed colors in system palette */

#define PC_SYS_USED            0x80 /* palentry is used (both system and logical) */
#define PC_SYS_RESERVED        0x40 /* system palentry is not to be mapped to */

static PALETTEENTRY *COLOR_sysPal; /* current system palette */

static int COLOR_gapStart = 256;
static int COLOR_gapEnd = -1;

UINT16   X11DRV_PALETTE_PaletteFlags     = 0;

/* initialize to zero to handle abortive X11DRV_PALETTE_VIRTUAL visuals */
ColorShifts X11DRV_PALETTE_default_shifts = { {0,0,0,}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0}, {0,0,0} };
static int X11DRV_PALETTE_Graymax        = 0;

static int palette_size;

/* First free dynamic color cell, 0 = full palette, -1 = fixed palette */
static int           X11DRV_PALETTE_firstFree = 0;
static unsigned char X11DRV_PALETTE_freeList[256];

static XContext palette_context;  /* X context to associate a color mapping to a palette */

static CRITICAL_SECTION palette_cs;
static CRITICAL_SECTION_DEBUG critsect_debug =
{
    0, 0, &palette_cs,
    { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
      0, 0, { (DWORD_PTR)(__FILE__ ": palette_cs") }
};
static CRITICAL_SECTION palette_cs = { &critsect_debug, -1, 0, 0, 0, 0 };

/**********************************************************************/

   /* Map an EGA index (0..15) to a pixel value in the system color space.  */

int X11DRV_PALETTE_mapEGAPixel[16];

/**********************************************************************/

#define NB_COLORCUBE_START_INDEX	63
#define NB_PALETTE_EMPTY_VALUE          -1

/* Maps entry in the system palette to X pixel value */
int *X11DRV_PALETTE_PaletteToXPixel = NULL;

/* Maps pixel to the entry in the system palette */
int *X11DRV_PALETTE_XPixelToPalette = NULL;

/**********************************************************************/

static BOOL X11DRV_PALETTE_BuildPrivateMap( const PALETTEENTRY *sys_pal_template );
static BOOL X11DRV_PALETTE_BuildSharedMap( const PALETTEENTRY *sys_pal_template );
static void X11DRV_PALETTE_FillDefaultColors( const PALETTEENTRY *sys_pal_template );
static void X11DRV_PALETTE_FormatSystemPalette(void);
static BOOL X11DRV_PALETTE_CheckSysColor( const PALETTEENTRY *sys_pal_template, COLORREF c);
static int X11DRV_PALETTE_LookupSystemXPixel(COLORREF col);


/***********************************************************************
 *           palette_get_mapping
 */
static int *palette_get_mapping( HPALETTE hpal )
{
    int *mapping;

    if (XFindContext( gdi_display, (XID)hpal, palette_context, (char **)&mapping )) mapping = NULL;
    return mapping;
}


/***********************************************************************
 *           palette_set_mapping
 */
static void palette_set_mapping( HPALETTE hpal, int *mapping )
{
    XSaveContext( gdi_display, (XID)hpal, palette_context, (char *)mapping );
}


/***********************************************************************
 *           COLOR_Init
 *
 * Initialize color management.
 */
int X11DRV_PALETTE_Init(void)
{
    int *mapping;
    PALETTEENTRY sys_pal_template[NB_RESERVED_COLORS];

    TRACE("initializing palette manager...\n");

    palette_context = XUniqueContext();
    palette_size = default_visual.colormap_size;

    switch(default_visual.class)
    {
    case DirectColor:
	X11DRV_PALETTE_PaletteFlags |= X11DRV_PALETTE_VIRTUAL;
        /* fall through */
    case GrayScale:
    case PseudoColor:
	if (private_color_map)
	{
	    XSetWindowAttributes win_attr;

            XFreeColormap( gdi_display, default_colormap );
	    default_colormap = XCreateColormap( gdi_display, root_window,
                                                default_visual.visual, AllocAll );
	    if (default_colormap)
	    {
	        X11DRV_PALETTE_PaletteFlags |= X11DRV_PALETTE_PRIVATE;

	        if( root_window != DefaultRootWindow(gdi_display) )
	        {
		    win_attr.colormap = default_colormap;
		    XChangeWindowAttributes( gdi_display, root_window, CWColormap, &win_attr );
		}
	    }
	}
        break;

    case StaticGray:
	X11DRV_PALETTE_PaletteFlags |= X11DRV_PALETTE_FIXED;
        X11DRV_PALETTE_Graymax = (1 << default_visual.depth)-1;
        break;

    case TrueColor:
	X11DRV_PALETTE_PaletteFlags |= X11DRV_PALETTE_VIRTUAL;
        /* fall through */
    case StaticColor:
        X11DRV_PALETTE_PaletteFlags |= X11DRV_PALETTE_FIXED;
        X11DRV_PALETTE_ComputeColorShifts(&X11DRV_PALETTE_default_shifts, default_visual.red_mask, default_visual.green_mask, default_visual.blue_mask);
        break;
    }

    if( X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL )
    {
        palette_size = 0;
    }
    else
    {
        GetPaletteEntries( GetStockObject(DEFAULT_PALETTE), 0, NB_RESERVED_COLORS, sys_pal_template );

        if ((mapping = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(int) * NB_RESERVED_COLORS )))
            palette_set_mapping( GetStockObject(DEFAULT_PALETTE), mapping );

        if (X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_PRIVATE)
            X11DRV_PALETTE_BuildPrivateMap( sys_pal_template );
        else
            X11DRV_PALETTE_BuildSharedMap( sys_pal_template );

        /* Build free list */

        if( X11DRV_PALETTE_firstFree != -1 )
            X11DRV_PALETTE_FormatSystemPalette();

        X11DRV_PALETTE_FillDefaultColors( sys_pal_template );
        palette_size = default_visual.colormap_size;
    }

    return palette_size;
}

/***********************************************************************
 *		X11DRV_PALETTE_ComputeChannelShift
 *
 * Calculate conversion parameters for a given color mask
 */
static void X11DRV_PALETTE_ComputeChannelShift(unsigned long maskbits, ChannelShift *physical, ChannelShift *to_logical)
{
    int i;

    if (maskbits==0)
    {
        physical->shift=0;
        physical->scale=0;
        physical->max=0;
        to_logical->shift=0;
        to_logical->scale=0;
        to_logical->max=0;
        return;
    }

    for(i=0;!(maskbits&1);i++)
        maskbits >>= 1;

    physical->shift = i;
    physical->max = maskbits;

    for(i=0;maskbits!=0;i++)
        maskbits >>= 1;
    physical->scale = i;

    if (physical->scale>8)
    {
        /* On FreeBSD, VNC's default 32bpp mode is bgrabb (ffc00000,3ff800,7ff)!
         * So we adjust the shifts to also normalize the color fields to
         * the Win32 standard of 8 bits per color.
         */
        to_logical->shift=physical->shift+(physical->scale-8);
        to_logical->scale=8;
        to_logical->max=0xff;
    } else {
        to_logical->shift=physical->shift;
        to_logical->scale=physical->scale;
        to_logical->max=physical->max;
    }
}

/***********************************************************************
 *      X11DRV_PALETTE_ComputeColorShifts
 *
 * Calculate conversion parameters for a given color
 */
void X11DRV_PALETTE_ComputeColorShifts(ColorShifts *shifts, unsigned long redMask, unsigned long greenMask, unsigned long blueMask)
{
    X11DRV_PALETTE_ComputeChannelShift(redMask, &shifts->physicalRed, &shifts->logicalRed);
    X11DRV_PALETTE_ComputeChannelShift(greenMask, &shifts->physicalGreen, &shifts->logicalGreen);
    X11DRV_PALETTE_ComputeChannelShift(blueMask, &shifts->physicalBlue, &shifts->logicalBlue);
}

/***********************************************************************
 *           X11DRV_PALETTE_BuildPrivateMap
 *
 * Allocate colorcells and initialize mapping tables.
 */
static BOOL X11DRV_PALETTE_BuildPrivateMap( const PALETTEENTRY *sys_pal_template )
{
    /* Private colormap - identity mapping */

    XColor color;
    int i;

    if((COLOR_sysPal = HeapAlloc(GetProcessHeap(), 0, sizeof(PALETTEENTRY)*palette_size)) == NULL) {
        WARN("Unable to allocate the system palette\n");
        return FALSE;
    }

    TRACE("Building private map - %i palette entries\n", palette_size);

      /* Allocate system palette colors */

    for( i=0; i < palette_size; i++ )
    {
       if( i < NB_RESERVED_COLORS/2 )
       {
         color.red   = sys_pal_template[i].peRed * 65535 / 255;
         color.green = sys_pal_template[i].peGreen * 65535 / 255;
         color.blue  = sys_pal_template[i].peBlue * 65535 / 255;
	 COLOR_sysPal[i] = sys_pal_template[i];
         COLOR_sysPal[i].peFlags |= PC_SYS_USED;
       }
       else if( i >= palette_size - NB_RESERVED_COLORS/2 )
       {
	 int j = NB_RESERVED_COLORS + i - palette_size;
         color.red   = sys_pal_template[j].peRed * 65535 / 255;
         color.green = sys_pal_template[j].peGreen * 65535 / 255;
         color.blue  = sys_pal_template[j].peBlue * 65535 / 255;
	 COLOR_sysPal[i] = sys_pal_template[j];
         COLOR_sysPal[i].peFlags |= PC_SYS_USED;
       }

       color.flags = DoRed | DoGreen | DoBlue;
       color.pixel = i;
       XStoreColor(gdi_display, default_colormap, &color);

       /* Set EGA mapping if color is from the first or last eight */

       if (i < 8)
           X11DRV_PALETTE_mapEGAPixel[i] = color.pixel;
       else if (i >= palette_size - 8 )
           X11DRV_PALETTE_mapEGAPixel[i - (palette_size - 16)] = color.pixel;
    }

    X11DRV_PALETTE_XPixelToPalette = X11DRV_PALETTE_PaletteToXPixel = NULL;

    COLOR_gapStart = 256; COLOR_gapEnd = -1;

    X11DRV_PALETTE_firstFree = (palette_size > NB_RESERVED_COLORS)?NB_RESERVED_COLORS/2 : -1;

    return FALSE;
}

/***********************************************************************
 *           X11DRV_PALETTE_BuildSharedMap
 *
 * Allocate colorcells and initialize mapping tables.
 */
static BOOL X11DRV_PALETTE_BuildSharedMap( const PALETTEENTRY *sys_pal_template )
{
   XColor		color;
   unsigned long        sysPixel[NB_RESERVED_COLORS];
   unsigned long*	pixDynMapping = NULL;
   unsigned long	plane_masks[1];
   int			i, j, warn = 0;
   int			diff, r, g, b, bp = 0, wp = 1;
   int			step = 1;
   unsigned int max = 256;
   Colormap		defaultCM;
   XColor		defaultColors[256];

   /* Copy the first bunch of colors out of the default colormap to prevent
    * colormap flashing as much as possible.  We're likely to get the most
    * important Window Manager colors, etc in the first 128 colors */
   defaultCM = DefaultColormap( gdi_display, DefaultScreen(gdi_display) );

   if (copy_default_colors > 256) copy_default_colors = 256;
   for (i = 0; i < copy_default_colors; i++)
       defaultColors[i].pixel = (long) i;
   XQueryColors(gdi_display, defaultCM, &defaultColors[0], copy_default_colors);
   for (i = 0; i < copy_default_colors; i++)
       XAllocColor( gdi_display, default_colormap, &defaultColors[i] );

   if (alloc_system_colors > 256) alloc_system_colors = 256;
   else if (alloc_system_colors < 20) alloc_system_colors = 20;
   TRACE("%d colors configured.\n", alloc_system_colors);

   TRACE("Building shared map - %i palette entries\n", palette_size);

   /* Be nice and allocate system colors as read-only */

   for( i = 0; i < NB_RESERVED_COLORS; i++ )
     {
        color.red   = sys_pal_template[i].peRed * 65535 / 255;
        color.green = sys_pal_template[i].peGreen * 65535 / 255;
        color.blue  = sys_pal_template[i].peBlue * 65535 / 255;
        color.flags = DoRed | DoGreen | DoBlue;

        if (!XAllocColor( gdi_display, default_colormap, &color ))
        {
	     XColor	best, c;

             if( !warn++ )
	     {
		  WARN("Not enough colors for the full system palette.\n");

	          bp = BlackPixel(gdi_display, DefaultScreen(gdi_display));
	          wp = WhitePixel(gdi_display, DefaultScreen(gdi_display));

	          max = 0xffffffff >> (32 - default_visual.depth);
	          if( max > 256 )
	          {
	  	      step = max/256;
		      max = 256;
	          }
	     }

	     /* reinit color (XAllocColor() may change it)
	      * and map to the best shared colorcell */

             color.red   = sys_pal_template[i].peRed * 65535 / 255;
             color.green = sys_pal_template[i].peGreen * 65535 / 255;
             color.blue  = sys_pal_template[i].peBlue * 65535 / 255;

	     best.pixel = best.red = best.green = best.blue = 0;
	     for( c.pixel = 0, diff = 0x7fffffff; c.pixel < max; c.pixel += step )
	     {
		XQueryColor(gdi_display, default_colormap, &c);
		r = (c.red - color.red)>>8;
		g = (c.green - color.green)>>8;
		b = (c.blue - color.blue)>>8;
		r = r*r + g*g + b*b;
		if( r < diff ) { best = c; diff = r; }
	     }

	     if( XAllocColor(gdi_display, default_colormap, &best) )
		 color.pixel = best.pixel;
	     else color.pixel = (i < NB_RESERVED_COLORS/2)? bp : wp;
        }

        sysPixel[i] = color.pixel;

        TRACE("syscolor(%x) -> pixel %i\n", *(const COLORREF*)(sys_pal_template+i),
              (int)color.pixel);

        /* Set EGA mapping if color in the first or last eight */

        if (i < 8)
            X11DRV_PALETTE_mapEGAPixel[i] = color.pixel;
        else if (i >= NB_RESERVED_COLORS - 8 )
            X11DRV_PALETTE_mapEGAPixel[i - (NB_RESERVED_COLORS-16)] = color.pixel;
     }

   /* now allocate changeable set */

   if( !(X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_FIXED) )
     {
	int c_min = 0, c_max = palette_size, c_val;

	TRACE("Dynamic colormap...\n");

	/* let's become the first client that actually follows
	 * X guidelines and does binary search...
	 */

	if((pixDynMapping = HeapAlloc(GetProcessHeap(), 0, sizeof(long)*palette_size)) == NULL) {
	    WARN("Out of memory while building system palette.\n");
	    return FALSE;
        }

	/* comment this out if you want to debug palette init */
	XGrabServer(gdi_display);

        while( c_max - c_min > 0 )
          {
             c_val = (c_max + c_min)/2 + (c_max + c_min)%2;

             if( !XAllocColorCells(gdi_display, default_colormap, False,
                                   plane_masks, 0, pixDynMapping, c_val) )
                 c_max = c_val - 1;
             else
               {
                 XFreeColors(gdi_display, default_colormap, pixDynMapping, c_val, 0);
                 c_min = c_val;
               }
          }

	if( c_min > alloc_system_colors - NB_RESERVED_COLORS)
	    c_min = alloc_system_colors - NB_RESERVED_COLORS;

	c_min = (c_min/2) + (c_min/2);		/* need even set for split palette */

	if( c_min > 0 )
	  if( !XAllocColorCells(gdi_display, default_colormap, False,
                                plane_masks, 0, pixDynMapping, c_min) )
	    {
	      WARN("Inexplicable failure during colorcell allocation.\n");
	      c_min = 0;
	    }

        palette_size = c_min + NB_RESERVED_COLORS;

	XUngrabServer(gdi_display);

	TRACE("adjusted size %i colorcells\n", palette_size);
     }
   else if( X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL )
	{
          /* virtual colorspace - ToPhysical takes care of
           * color translations but we have to allocate full palette
	   * to maintain compatibility
	   */
	  palette_size = 256;
	  TRACE("Virtual colorspace - screendepth %i\n", default_visual.depth);
	}
   else palette_size = NB_RESERVED_COLORS;	/* system palette only - however we can alloc a bunch
			                 * of colors and map to them */

   TRACE("Shared system palette uses %i colors.\n", palette_size);

   /* set gap to account for pixel shortage. It has to be right in the center
    * of the system palette because otherwise raster ops get screwed. */

   if( palette_size >= 256 )
     { COLOR_gapStart = 256; COLOR_gapEnd = -1; }
   else
     { COLOR_gapStart = palette_size/2; COLOR_gapEnd = 255 - palette_size/2; }

   X11DRV_PALETTE_firstFree = ( palette_size > NB_RESERVED_COLORS &&
		      (X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL || !(X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_FIXED)) )
		     ? NB_RESERVED_COLORS/2 : -1;

   COLOR_sysPal = HeapAlloc(GetProcessHeap(),0,sizeof(PALETTEENTRY)*256);
   if(COLOR_sysPal == NULL) {
       ERR("Unable to allocate the system palette!\n");
       HeapFree(GetProcessHeap(), 0, pixDynMapping);
       return FALSE;
   }

   /* setup system palette entry <-> pixel mappings and fill in 20 fixed entries */

   if (default_visual.depth <= 8)
   {
       X11DRV_PALETTE_XPixelToPalette = HeapAlloc( GetProcessHeap(), 0, 256 * sizeof(int) );
       if(X11DRV_PALETTE_XPixelToPalette == NULL) {
           ERR("Out of memory: XPixelToPalette!\n");
           HeapFree(GetProcessHeap(), 0, pixDynMapping);
           return FALSE;
       }
       for( i = 0; i < 256; i++ )
           X11DRV_PALETTE_XPixelToPalette[i] = NB_PALETTE_EMPTY_VALUE;
   }

   /* for hicolor visuals PaletteToPixel mapping is used to skip
    * RGB->pixel calculation in X11DRV_PALETTE_ToPhysical().
    */

   X11DRV_PALETTE_PaletteToXPixel = HeapAlloc(GetProcessHeap(),0,sizeof(int)*256);
   if(X11DRV_PALETTE_PaletteToXPixel == NULL) {
       ERR("Out of memory: PaletteToXPixel!\n");
       HeapFree(GetProcessHeap(), 0, pixDynMapping);
       return FALSE;
   }

   for( i = j = 0; i < 256; i++ )
   {
      if( i >= COLOR_gapStart && i <= COLOR_gapEnd )
      {
         X11DRV_PALETTE_PaletteToXPixel[i] = NB_PALETTE_EMPTY_VALUE;
         COLOR_sysPal[i].peFlags = 0;	/* mark as unused */
         continue;
      }

      if( i < NB_RESERVED_COLORS/2 )
      {
        X11DRV_PALETTE_PaletteToXPixel[i] = sysPixel[i];
        COLOR_sysPal[i] = sys_pal_template[i];
        COLOR_sysPal[i].peFlags |= PC_SYS_USED;
      }
      else if( i >= 256 - NB_RESERVED_COLORS/2 )
      {
        X11DRV_PALETTE_PaletteToXPixel[i] = sysPixel[(i + NB_RESERVED_COLORS) - 256];
        COLOR_sysPal[i] = sys_pal_template[(i + NB_RESERVED_COLORS) - 256];
        COLOR_sysPal[i].peFlags |= PC_SYS_USED;
      }
      else if( pixDynMapping )
             X11DRV_PALETTE_PaletteToXPixel[i] = pixDynMapping[j++];
           else
             X11DRV_PALETTE_PaletteToXPixel[i] = i;

      TRACE("index %i -> pixel %i\n", i, X11DRV_PALETTE_PaletteToXPixel[i]);

      if( X11DRV_PALETTE_XPixelToPalette )
          X11DRV_PALETTE_XPixelToPalette[X11DRV_PALETTE_PaletteToXPixel[i]] = i;
   }

   HeapFree(GetProcessHeap(), 0, pixDynMapping);

   return TRUE;
}

/***********************************************************************
 *      Colormap Initialization
 */
static void X11DRV_PALETTE_FillDefaultColors( const PALETTEENTRY *sys_pal_template )
{
 /* initialize unused entries to what Windows uses as a color
  * cube - based on Greg Kreider's code.
  */

  int i = 0, idx = 0;
  int red, no_r, inc_r;
  int green, no_g, inc_g;
  int blue, no_b, inc_b;

  if (palette_size <= NB_RESERVED_COLORS)
  	return;
  while (i*i*i < (palette_size - NB_RESERVED_COLORS)) i++;
  no_r = no_g = no_b = --i;
  if ((no_r * (no_g+1) * no_b) < (palette_size - NB_RESERVED_COLORS)) no_g++;
  if ((no_r * no_g * (no_b+1)) < (palette_size - NB_RESERVED_COLORS)) no_b++;
  inc_r = (255 - NB_COLORCUBE_START_INDEX)/no_r;
  inc_g = (255 - NB_COLORCUBE_START_INDEX)/no_g;
  inc_b = (255 - NB_COLORCUBE_START_INDEX)/no_b;

  idx = X11DRV_PALETTE_firstFree;

  if( idx != -1 )
    for (blue = NB_COLORCUBE_START_INDEX; blue < 256 && idx; blue += inc_b )
     for (green = NB_COLORCUBE_START_INDEX; green < 256 && idx; green += inc_g )
      for (red = NB_COLORCUBE_START_INDEX; red < 256 && idx; red += inc_r )
      {
	 /* weird but true */

	 if( red == NB_COLORCUBE_START_INDEX && green == red && blue == green ) continue;

         COLOR_sysPal[idx].peRed = red;
         COLOR_sysPal[idx].peGreen = green;
         COLOR_sysPal[idx].peBlue = blue;

	 /* set X color */

	 if( X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL )
	 {
            ColorShifts *shifts = &X11DRV_PALETTE_default_shifts;
            if (shifts->physicalRed.max != 255) no_r = (red * shifts->physicalRed.max) / 255;
            if (shifts->physicalGreen.max != 255) no_g = (green * shifts->physicalGreen.max) / 255;
            if (shifts->physicalBlue.max != 255) no_b = (blue * shifts->physicalBlue.max) / 255;

            X11DRV_PALETTE_PaletteToXPixel[idx] = (no_r << shifts->physicalRed.shift) | (no_g << shifts->physicalGreen.shift) | (no_b << shifts->physicalBlue.shift);
	 }
	 else if( !(X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_FIXED) )
	 {
	   XColor color;
	   color.pixel = (X11DRV_PALETTE_PaletteToXPixel)? X11DRV_PALETTE_PaletteToXPixel[idx] : idx;
	   color.red = COLOR_sysPal[idx].peRed << 8;
	   color.green = COLOR_sysPal[idx].peGreen << 8;
	   color.blue =  COLOR_sysPal[idx].peBlue << 8;
	   color.flags = DoRed | DoGreen | DoBlue;
	   XStoreColor(gdi_display, default_colormap, &color);
	 }
	 idx = X11DRV_PALETTE_freeList[idx];
      }

  /* try to fill some entries in the "gap" with
   * what's already in the colormap - they will be
   * mappable to but not changeable. */

  if( COLOR_gapStart < COLOR_gapEnd && X11DRV_PALETTE_XPixelToPalette )
  {
    XColor	xc;
    int		r, g, b, max;

    max = alloc_system_colors - (256 - (COLOR_gapEnd - COLOR_gapStart));
    for ( i = 0, idx = COLOR_gapStart; i < 256 && idx <= COLOR_gapEnd; i++ )
      if( X11DRV_PALETTE_XPixelToPalette[i] == NB_PALETTE_EMPTY_VALUE )
	{
	  xc.pixel = i;

	  XQueryColor(gdi_display, default_colormap, &xc);
	  r = xc.red>>8; g = xc.green>>8; b = xc.blue>>8;

	  if( xc.pixel < 256 && X11DRV_PALETTE_CheckSysColor( sys_pal_template, RGB(r, g, b)) &&
	      XAllocColor(gdi_display, default_colormap, &xc) )
	  {
	     X11DRV_PALETTE_XPixelToPalette[xc.pixel] = idx;
	     X11DRV_PALETTE_PaletteToXPixel[idx] = xc.pixel;
           *(COLORREF*)(COLOR_sysPal + idx) = RGB(r, g, b);
	     COLOR_sysPal[idx++].peFlags |= PC_SYS_USED;
	     if( --max <= 0 ) break;
	  }
	}
  }
}


/***********************************************************************
 *           X11DRV_IsSolidColor
 *
 * Check whether 'color' can be represented with a solid color.
 */
BOOL X11DRV_IsSolidColor( COLORREF color )
{
    int i;
    const PALETTEENTRY *pEntry = COLOR_sysPal;

    if (color & 0xff000000) return TRUE;  /* indexed color */

    if (!color || (color == 0xffffff)) return TRUE;  /* black or white */

    if (X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL) return TRUE;  /* no palette */

    EnterCriticalSection( &palette_cs );
    for (i = 0; i < palette_size ; i++, pEntry++)
    {
        if( i < COLOR_gapStart || i > COLOR_gapEnd )
            if ((GetRValue(color) == pEntry->peRed) &&
                (GetGValue(color) == pEntry->peGreen) &&
                (GetBValue(color) == pEntry->peBlue))
            {
                LeaveCriticalSection( &palette_cs );
                return TRUE;
            }
    }
    LeaveCriticalSection( &palette_cs );
    return FALSE;
}


/***********************************************************************
 *           X11DRV_PALETTE_ToLogical
 *
 * Return RGB color for given X pixel.
 */
COLORREF X11DRV_PALETTE_ToLogical(X11DRV_PDEVICE *physDev, int pixel)
{
    XColor color;

    /* check for hicolor visuals first */

    if ( (X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_FIXED) && !X11DRV_PALETTE_Graymax )
    {
         ColorShifts *shifts = &X11DRV_PALETTE_default_shifts;

         if(physDev->color_shifts)
             shifts = physDev->color_shifts;

         color.red = (pixel >> shifts->logicalRed.shift) & shifts->logicalRed.max;
         if (shifts->logicalRed.scale<8)
             color.red=  color.red   << (8-shifts->logicalRed.scale) |
                         color.red   >> (2*shifts->logicalRed.scale-8);
         color.green = (pixel >> shifts->logicalGreen.shift) & shifts->logicalGreen.max;
         if (shifts->logicalGreen.scale<8)
             color.green=color.green << (8-shifts->logicalGreen.scale) |
                         color.green >> (2*shifts->logicalGreen.scale-8);
         color.blue = (pixel >> shifts->logicalBlue.shift) & shifts->logicalBlue.max;
         if (shifts->logicalBlue.scale<8)
             color.blue= color.blue  << (8-shifts->logicalBlue.scale)  |
                         color.blue  >> (2*shifts->logicalBlue.scale-8);
         return RGB(color.red,color.green,color.blue);
    }

    /* check if we can bypass X */

    if ((default_visual.depth <= 8) && (pixel < 256) &&
        !(X11DRV_PALETTE_PaletteFlags & (X11DRV_PALETTE_VIRTUAL | X11DRV_PALETTE_FIXED)) ) {
        COLORREF ret;
        EnterCriticalSection( &palette_cs );
        ret = *(COLORREF *)(COLOR_sysPal + (X11DRV_PALETTE_XPixelToPalette ? X11DRV_PALETTE_XPixelToPalette[pixel]: pixel)) & 0x00ffffff;
        LeaveCriticalSection( &palette_cs );
        return ret;
    }

    color.pixel = pixel;
    XQueryColor(gdi_display, default_colormap, &color);
    return RGB(color.red >> 8, color.green >> 8, color.blue >> 8);
}


/***********************************************************************
 *	     X11DRV_SysPaletteLookupPixel
 */
static int X11DRV_SysPaletteLookupPixel( COLORREF col, BOOL skipReserved )
{
    int i, best = 0, diff = 0x7fffffff;
    int r,g,b;

    for( i = 0; i < palette_size && diff ; i++ )
    {
        if( !(COLOR_sysPal[i].peFlags & PC_SYS_USED) ||
            (skipReserved && COLOR_sysPal[i].peFlags  & PC_SYS_RESERVED) )
            continue;

        r = COLOR_sysPal[i].peRed - GetRValue(col);
        g = COLOR_sysPal[i].peGreen - GetGValue(col);
        b = COLOR_sysPal[i].peBlue - GetBValue(col);

        r = r*r + g*g + b*b;

        if( r < diff ) { best = i; diff = r; }
    }
    return best;
}

 
static inline BOOL colour_is_brighter(RGBQUAD c1, RGBQUAD c2)
{
    return (c1.rgbRed * c1.rgbRed + c1.rgbGreen * c1.rgbGreen + c1.rgbBlue * c1.rgbBlue) > 
        (c2.rgbRed * c2.rgbRed + c2.rgbGreen * c2.rgbGreen + c2.rgbBlue * c2.rgbBlue);
}

/***********************************************************************
 *           X11DRV_PALETTE_GetColor
 *
 * Resolve PALETTEINDEX/PALETTERGB/DIBINDEX COLORREFs to an RGB COLORREF.
 */
COLORREF X11DRV_PALETTE_GetColor( X11DRV_PDEVICE *physDev, COLORREF color )
{
    HPALETTE             hPal = GetCurrentObject(physDev->dev.hdc, OBJ_PAL );
    PALETTEENTRY         entry;

    if (color & (1 << 24))  /* PALETTEINDEX */
    {
        unsigned int idx = LOWORD(color);
        if (!GetPaletteEntries( hPal, idx, 1, &entry )) return 0;
        return RGB( entry.peRed, entry.peGreen, entry.peBlue );
    }

    if (color >> 24 == 2)  /* PALETTERGB */
    {
        unsigned int idx = GetNearestPaletteIndex( hPal, color & 0xffffff );
        if (!GetPaletteEntries( hPal, idx, 1, &entry )) return 0;
        return RGB( entry.peRed, entry.peGreen, entry.peBlue );
    }

    if (color >> 16 == 0x10ff)  /* DIBINDEX */
        return 0;

    return color & 0xffffff;
}

/***********************************************************************
 *           X11DRV_PALETTE_ToPhysical
 *
 * Return the physical color closest to 'color'.
 */
int X11DRV_PALETTE_ToPhysical( X11DRV_PDEVICE *physDev, COLORREF color )
{
    WORD 		 index = 0;
    HPALETTE 		 hPal = GetCurrentObject(physDev->dev.hdc, OBJ_PAL );
    int *mapping = palette_get_mapping( hPal );
    PALETTEENTRY entry;
    ColorShifts *shifts = &X11DRV_PALETTE_default_shifts;

    if(physDev->color_shifts)
        shifts = physDev->color_shifts;

    if ( X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_FIXED )
    {
        /* there is no colormap limitation; we are going to have to compute
         * the pixel value from the visual information stored earlier
	 */
	unsigned long red, green, blue;

        if (color & (1 << 24))  /* PALETTEINDEX */
        {
            unsigned int idx = LOWORD( color );

            if (!GetPaletteEntries( hPal, idx, 1, &entry ))
            {
                WARN("PALETTEINDEX(%x) : idx %d is out of bounds, assuming black\n", color, idx);
                return 0;
            }
            if (mapping) return mapping[idx];
            red   = entry.peRed;
            green = entry.peGreen;
            blue  = entry.peBlue;
        }
        else if (color >> 16 == 0x10ff)  /* DIBINDEX */
        {
            return 0;
        }
        else  /* RGB */
        {
            if (physDev->depth == 1)
                return (((color >> 16) & 0xff) +
                        ((color >> 8) & 0xff) + (color & 0xff) > 255*3/2) ? 1 : 0;
            red   = GetRValue( color );
            green = GetGValue( color );
            blue  = GetBValue( color );
        }

        if (X11DRV_PALETTE_Graymax)
        {
            /* grayscale only; return scaled value */
            return ( (red * 30 + green * 59 + blue * 11) * X11DRV_PALETTE_Graymax) / 25500;
        }
        else
        {
            /* scale each individually and construct the TrueColor pixel value */
            if (shifts->physicalRed.scale < 8)
                red = red >> (8-shifts->physicalRed.scale);
            else if (shifts->physicalRed.scale > 8)
                red = red << (shifts->physicalRed.scale-8) |
                      red >> (16-shifts->physicalRed.scale);
            if (shifts->physicalGreen.scale < 8)
                green = green >> (8-shifts->physicalGreen.scale);
            else if (shifts->physicalGreen.scale > 8)
                green = green << (shifts->physicalGreen.scale-8) |
                        green >> (16-shifts->physicalGreen.scale);
            if (shifts->physicalBlue.scale < 8)
                blue =  blue >> (8-shifts->physicalBlue.scale);
            else if (shifts->physicalBlue.scale > 8)
                blue =  blue << (shifts->physicalBlue.scale-8) |
                        blue >> (16-shifts->physicalBlue.scale);

            return (red << shifts->physicalRed.shift) | (green << shifts->physicalGreen.shift) | (blue << shifts->physicalBlue.shift);
        }
    }
    else
    {
        if (!mapping)
            WARN("Palette %p is not realized\n", hPal);

        if (color & (1 << 24))  /* PALETTEINDEX */
        {
            index = LOWORD( color );
            if (!GetPaletteEntries( hPal, index, 1, &entry ))
                WARN("PALETTEINDEX(%x) : index %i is out of bounds\n", color, index);
            else if (mapping) index = mapping[index];
        }
        else if (color >> 24 == 2)  /* PALETTERGB */
        {
            index = GetNearestPaletteIndex( hPal, color );
            if (mapping) index = mapping[index];
        }
        else if (color >> 16 == 0x10ff)  /* DIBINDEX */
        {
            return 0;
        }
        else  /* RGB */
        {
            if (physDev->depth == 1)
                return (((color >> 16) & 0xff) +
                        ((color >> 8) & 0xff) + (color & 0xff) > 255*3/2) ? 1 : 0;

            EnterCriticalSection( &palette_cs );
            index = X11DRV_SysPaletteLookupPixel( color & 0xffffff, FALSE);
            if (X11DRV_PALETTE_PaletteToXPixel) index = X11DRV_PALETTE_PaletteToXPixel[index];
            LeaveCriticalSection( &palette_cs );
        }
    }
    return index;
}

/***********************************************************************
 *           X11DRV_PALETTE_LookupPixel
 */
static int X11DRV_PALETTE_LookupPixel(ColorShifts *shifts, COLORREF color )
{
    unsigned char spec_type = color >> 24;

    /* Only accept RGB which has spec_type = 0 */
    if(spec_type)
        return 0;

    color &= 0xffffff;

    if ( X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_FIXED )
    {
        unsigned long red, green, blue;
        red = GetRValue(color); green = GetGValue(color); blue = GetBValue(color);

        if (X11DRV_PALETTE_Graymax)
        {
            /* grayscale only; return scaled value */
            return ( (red * 30 + green * 59 + blue * 11) * X11DRV_PALETTE_Graymax) / 25500;
        }
        else
        {
            /* No shifts are set in case of 1-bit */
            if(!shifts) shifts = &X11DRV_PALETTE_default_shifts;

            /* scale each individually and construct the TrueColor pixel value */
            if (shifts->physicalRed.scale < 8)
                red = red >> (8-shifts->physicalRed.scale);
            else if (shifts->physicalRed.scale > 8)
                red = red << (shifts->physicalRed.scale-8) |
                      red >> (16-shifts->physicalRed.scale);
            if (shifts->physicalGreen.scale < 8)
                green = green >> (8-shifts->physicalGreen.scale);
            else if (shifts->physicalGreen.scale > 8)
                green = green << (shifts->physicalGreen.scale-8) |
                        green >> (16-shifts->physicalGreen.scale);
            if (shifts->physicalBlue.scale < 8)
                blue =  blue >> (8-shifts->physicalBlue.scale);
            else if (shifts->physicalBlue.scale > 8)
                blue =  blue << (shifts->physicalBlue.scale-8) |
                        blue >> (16-shifts->physicalBlue.scale);

            return (red << shifts->physicalRed.shift) | (green << shifts->physicalGreen.shift) | (blue << shifts->physicalBlue.shift);
        }
    }
    else
    {
        WORD index;
        HPALETTE hPal = GetStockObject(DEFAULT_PALETTE);
        int *mapping = palette_get_mapping( hPal );

        if (!mapping)
            WARN("Palette %p is not realized\n", hPal);

        EnterCriticalSection( &palette_cs );
        index = X11DRV_SysPaletteLookupPixel( color, FALSE);
        if (X11DRV_PALETTE_PaletteToXPixel)
            index = X11DRV_PALETTE_PaletteToXPixel[index];
        LeaveCriticalSection( &palette_cs );
        return index;
    }
}


/***********************************************************************
 *           X11DRV_PALETTE_LookupSystemXPixel
 */
static int X11DRV_PALETTE_LookupSystemXPixel(COLORREF col)
{
 int            i, best = 0, diff = 0x7fffffff;
 int            size = palette_size;
 int            r,g,b;

 for( i = 0; i < size && diff ; i++ )
    {
      if( i == NB_RESERVED_COLORS/2 )
      {
      	int newi = size - NB_RESERVED_COLORS/2;
	if (newi>i) i=newi;
      }

      r = COLOR_sysPal[i].peRed - GetRValue(col);
      g = COLOR_sysPal[i].peGreen - GetGValue(col);
      b = COLOR_sysPal[i].peBlue - GetBValue(col);

      r = r*r + g*g + b*b;

      if( r < diff ) { best = i; diff = r; }
    }

 return (X11DRV_PALETTE_PaletteToXPixel)? X11DRV_PALETTE_PaletteToXPixel[best] : best;
}

/***********************************************************************
 *           X11DRV_PALETTE_FormatSystemPalette
 */
static void X11DRV_PALETTE_FormatSystemPalette(void)
{
 /* Build free list so we'd have an easy way to find
  * out if there are any available colorcells.
  */

  int i, j = X11DRV_PALETTE_firstFree = NB_RESERVED_COLORS/2;

  COLOR_sysPal[j].peFlags = 0;
  for( i = NB_RESERVED_COLORS/2 + 1 ; i < 256 - NB_RESERVED_COLORS/2 ; i++ )
    if( i < COLOR_gapStart || i > COLOR_gapEnd )
      {
	COLOR_sysPal[i].peFlags = 0;  /* unused tag */
	X11DRV_PALETTE_freeList[j] = i;	  /* next */
        j = i;
      }
  X11DRV_PALETTE_freeList[j] = 0;
}

/***********************************************************************
 *           X11DRV_PALETTE_CheckSysColor
 */
static BOOL X11DRV_PALETTE_CheckSysColor( const PALETTEENTRY *sys_pal_template, COLORREF c)
{
  int i;
  for( i = 0; i < NB_RESERVED_COLORS; i++ )
       if( c == (*(const COLORREF*)(sys_pal_template + i) & 0x00ffffff) )
	   return 0;
  return 1;
}


/***********************************************************************
 *	     X11DRV_LookupSysPaletteExact
 */
static int X11DRV_LookupSysPaletteExact( BYTE r, BYTE g, BYTE b )
{
    int i;
    for( i = 0; i < palette_size; i++ )
    {
        if( COLOR_sysPal[i].peFlags & PC_SYS_USED )  /* skips gap */
            if( COLOR_sysPal[i].peRed == r &&
                COLOR_sysPal[i].peGreen == g &&
                COLOR_sysPal[i].peBlue == b )
                return i;
    }
    return -1;
}


/***********************************************************************
 *              RealizePalette    (X11DRV.@)
 */
UINT X11DRV_RealizePalette( PHYSDEV dev, HPALETTE hpal, BOOL primary )
{
    X11DRV_PDEVICE *physDev = get_x11drv_dev( dev );
    char flag;
    int  index;
    UINT i, iRemapped = 0;
    int *prev_mapping, *mapping;
    PALETTEENTRY entries[256];
    WORD num_entries;

    if (X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL) return 0;

    if (!GetObjectW( hpal, sizeof(num_entries), &num_entries )) return 0;

    /* initialize palette mapping table */
    prev_mapping = palette_get_mapping( hpal );
    if (prev_mapping)
        mapping = HeapReAlloc( GetProcessHeap(), 0, prev_mapping, sizeof(int)*num_entries);
    else 
	mapping = HeapAlloc( GetProcessHeap(), 0, sizeof(int)*num_entries);

    if(mapping == NULL) {
        ERR("Unable to allocate new mapping -- memory exhausted!\n");
        return 0;
    }
    palette_set_mapping( hpal, mapping );

    if (num_entries > 256)
    {
        FIXME( "more than 256 entries not supported\n" );
        num_entries = 256;
    }
    if (!(num_entries = GetPaletteEntries( hpal, 0, num_entries, entries ))) return 0;

    /* reset dynamic system palette entries */

    EnterCriticalSection( &palette_cs );
    if( primary && X11DRV_PALETTE_firstFree != -1)
         X11DRV_PALETTE_FormatSystemPalette();

    for (i = 0; i < num_entries; i++)
    {
        index = -1;
        flag = PC_SYS_USED;

        /* Even though the docs say that only one flag is to be set,
         * they are a bitmask. At least one app sets more than one at
         * the same time. */
        if ( entries[i].peFlags & PC_EXPLICIT ) {
	    /* palette entries are indices into system palette */
            index = *(WORD*)&entries[i];
            if( index > 255 || (index >= COLOR_gapStart && index <= COLOR_gapEnd) )
            {
                WARN("PC_EXPLICIT: idx %d out of system palette, assuming black.\n", index);
                index = 0;
            }
            if( X11DRV_PALETTE_PaletteToXPixel ) index = X11DRV_PALETTE_PaletteToXPixel[index];
        } else {
            if ( entries[i].peFlags & PC_RESERVED ) {
	        /* forbid future mappings to this entry */
                flag |= PC_SYS_RESERVED;
            }
            
            if (! (entries[i].peFlags & PC_NOCOLLAPSE) ) {
	        /* try to collapse identical colors */
                index = X11DRV_LookupSysPaletteExact( entries[i].peRed, entries[i].peGreen, entries[i].peBlue );
            }

            if( index < 0 )
            {
                if( X11DRV_PALETTE_firstFree > 0 )
                {
                    XColor color;
                    index = X11DRV_PALETTE_firstFree;  /* ought to be available */
                    X11DRV_PALETTE_firstFree = X11DRV_PALETTE_freeList[index];

                    color.pixel = (X11DRV_PALETTE_PaletteToXPixel) ? X11DRV_PALETTE_PaletteToXPixel[index] : index;
                    color.red = entries[i].peRed << 8;
                    color.green = entries[i].peGreen << 8;
                    color.blue = entries[i].peBlue << 8;
                    color.flags = DoRed | DoGreen | DoBlue;
                    XStoreColor(gdi_display, default_colormap, &color);

                    COLOR_sysPal[index] = entries[i];
                    COLOR_sysPal[index].peFlags = flag;
		    X11DRV_PALETTE_freeList[index] = 0;

                    if( X11DRV_PALETTE_PaletteToXPixel ) index = X11DRV_PALETTE_PaletteToXPixel[index];
                }
                else if ( X11DRV_PALETTE_PaletteFlags & X11DRV_PALETTE_VIRTUAL )
                {
                    index = X11DRV_PALETTE_LookupPixel( physDev->color_shifts, RGB( entries[i].peRed, entries[i].peGreen, entries[i].peBlue ));
                }

                /* we have to map to existing entry in the system palette */

                index = X11DRV_SysPaletteLookupPixel( RGB( entries[i].peRed, entries[i].peGreen, entries[i].peBlue ),
                                                      TRUE );
            }

            if( X11DRV_PALETTE_PaletteToXPixel ) index = X11DRV_PALETTE_PaletteToXPixel[index];
        }

        if( !prev_mapping || mapping[i] != index ) iRemapped++;
        mapping[i] = index;

        TRACE("entry %i (%x) -> pixel %i\n", i, *(COLORREF*)&entries[i], index);

    }
    LeaveCriticalSection( &palette_cs );
    return iRemapped;
}


/***********************************************************************
 *              UnrealizePalette    (X11DRV.@)
 */
BOOL X11DRV_UnrealizePalette( HPALETTE hpal )
{
    int *mapping = palette_get_mapping( hpal );

    if (mapping)
    {
        XDeleteContext( gdi_display, (XID)hpal, palette_context );
        HeapFree( GetProcessHeap(), 0, mapping );
    }
    return TRUE;
}


/***********************************************************************
 *              GetSystemPaletteEntries   (X11DRV.@)
 */
UINT X11DRV_GetSystemPaletteEntries( PHYSDEV dev, UINT start, UINT count, LPPALETTEENTRY entries )
{
    UINT i;

    if (!entries) return palette_size;
    if (start >= palette_size) return 0;
    if (start + count >= palette_size) count = palette_size - start;

    EnterCriticalSection( &palette_cs );
    for (i = 0; i < count; i++)
    {
        entries[i].peRed   = COLOR_sysPal[start + i].peRed;
        entries[i].peGreen = COLOR_sysPal[start + i].peGreen;
        entries[i].peBlue  = COLOR_sysPal[start + i].peBlue;
        entries[i].peFlags = 0;
        TRACE("\tidx(%02x) -> RGB(%08x)\n", start + i, *(COLORREF*)(entries + i) );
    }
    LeaveCriticalSection( &palette_cs );
    return count;
}


/***********************************************************************
 *              GetNearestColor   (X11DRV.@)
 */
COLORREF X11DRV_GetNearestColor( PHYSDEV dev, COLORREF color )
{
    unsigned char spec_type = color >> 24;
    COLORREF nearest;

    if (!palette_size) return color;

    if (spec_type == 1 || spec_type == 2)
    {
        /* we need logical palette for PALETTERGB and PALETTEINDEX colorrefs */

        UINT index;
        PALETTEENTRY entry;
        HPALETTE hpal = GetCurrentObject( dev->hdc, OBJ_PAL );

        if (!hpal) hpal = GetStockObject( DEFAULT_PALETTE );

        if (spec_type == 2) /* PALETTERGB */
            index = GetNearestPaletteIndex( hpal, color );
        else  /* PALETTEINDEX */
            index = LOWORD(color);

        if (!GetPaletteEntries( hpal, index, 1, &entry ))
        {
            WARN("RGB(%x) : idx %d is out of bounds, assuming NULL\n", color, index );
            if (!GetPaletteEntries( hpal, 0, 1, &entry )) return CLR_INVALID;
        }
        color = RGB( entry.peRed,  entry.peGreen, entry.peBlue );
    }
    color &= 0x00ffffff;
    EnterCriticalSection( &palette_cs );
    nearest = (0x00ffffff & *(COLORREF*)(COLOR_sysPal + X11DRV_SysPaletteLookupPixel(color, FALSE)));
    LeaveCriticalSection( &palette_cs );

    TRACE("(%06x): returning %06x\n", color, nearest );
    return nearest;
}


/***********************************************************************
 *              RealizeDefaultPalette    (X11DRV.@)
 */
UINT X11DRV_RealizeDefaultPalette( PHYSDEV dev )
{
    UINT ret = 0;

    if (palette_size && GetObjectType(dev->hdc) != OBJ_MEMDC)
    {
        /* lookup is needed to account for SetSystemPaletteUse() stuff */
        int i, index, *mapping = palette_get_mapping( GetStockObject(DEFAULT_PALETTE) );
        PALETTEENTRY entries[NB_RESERVED_COLORS];

        GetPaletteEntries( GetStockObject(DEFAULT_PALETTE), 0, NB_RESERVED_COLORS, entries );
        EnterCriticalSection( &palette_cs );
        for( i = 0; i < NB_RESERVED_COLORS; i++ )
        {
            index = X11DRV_PALETTE_LookupSystemXPixel( RGB(entries[i].peRed,
                                                           entries[i].peGreen,
                                                           entries[i].peBlue) );
            /* mapping is allocated in COLOR_InitPalette() */
            if( index != mapping[i] )
            {
                mapping[i]=index;
                ret++;
            }
        }
        LeaveCriticalSection( &palette_cs );
    }
    return ret;
}