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xlibrgb.c

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org Code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * This code is derived from GdkRgb.
 * For more information on GdkRgb, see http://www.levien.com/gdkrgb/
 * Raph Levien <raph@acm.org>
 */

/* Ported by Christopher Blizzard to Xlib.  With permission from the
 * original authors and the copyright holders of this file, the
 * contents of this file are also redistributable under the terms of
 * the Mozilla Public license.  For information about the Mozilla
 * Public License, please see the license information at
 * http://www.mozilla.org/MPL/ */

/* This code is copyright the following authors:
 * Raph Levien          <raph@acm.org>
 * Manish Singh         <manish@gtk.org>
 * Tim Janik            <timj@gtk.org>
 * Peter Mattis         <petm@xcf.berkeley.edu>
 * Spencer Kimball      <spencer@xcf.berkeley.edu>
 * Josh MacDonald       <jmacd@xcf.berkeley.edu>
 * Christopher Blizzard <blizzard@redhat.com>
 * Owen Taylor          <otaylor@redhat.com>
 * Shawn T. Amundson    <amundson@gtk.org>
 * Roland Mainz         <roland.mainz@informatik.med.uni-giessen.de>
 */

#include <math.h>

#if HAVE_CONFIG_H
#  include <config.h>
#  if STDC_HEADERS
#    include <stdio.h>
#    include <stdlib.h>
#    include <string.h>
#  endif
#else
#  include <stdio.h>
#  include <stdlib.h>
#endif /* HAVE_CONFIG_H */

#define ENABLE_GRAYSCALE

#define G_LITTLE_ENDIAN 1
#define G_BIG_ENDIAN    2

/* include this before so that we can get endian definitions if
   they are there... */

#include "xlibrgb.h"

#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */

/* check our endianness */
#ifdef USE_MOZILLA_TYPES

/* check to make sure that we don't have both types defined. */
#ifdef IS_LITTLE_ENDIAN
#ifdef IS_BIG_ENDIAN
#error what the hell?  both endian types are defined!
#endif
#endif

#ifdef IS_LITTLE_ENDIAN
#define G_BYTE_ORDER G_LITTLE_ENDIAN
#else
#define G_BYTE_ORDER G_BIG_ENDIAN
#endif /* IS_LITTLE_ENDIAN */

#else

/* XXX fix this for an autodetect for endian-ness */
#define G_BYTE_ORDER G_LITTLE_ENDIAN

#endif /* USE_MOZILLA_TYPES */

#ifndef MIN
#define MIN(a, b)  (((a) < (b)) ? (a) : (b))
#endif

#ifndef MAX
#define MAX(a, b)  (((a) > (b)) ? (a) : (b))
#endif

typedef enum {
  LSB_FIRST,
  MSB_FIRST
} ByteOrder;

static void xxlib_deregister_handle_by_handle(XlibRgbHandle *handle);

typedef void (*XlibRgbConvFunc) (XlibRgbHandle *handle,
                                 XImage *image,
                                 int ax, int ay,
                                 int width, int height,
                                 unsigned char *buf, int rowstride,
                                 int x_align, int y_align,
                                 XlibRgbCmap *cmap);

#define IMAGE_WIDTH 256
#define STAGE_ROWSTRIDE (IMAGE_WIDTH * 3)
#define IMAGE_HEIGHT 128
#define N_IMAGES 6

/* Some of these fields should go, as they're not being used at all.
   Globals should generally migrate into here - it's very likely that
   we'll want to run more than one GdkRgbInfo context at the same time
   (i.e. some but not all windows have privately installed
   colormaps). */

struct _XlibRgbHandle
{
  Display          *display;
  Screen           *screen;
  int               screen_num;
  XVisualInfo      *x_visual_info;
  Colormap          cmap;
  Visual           *default_visualid;
  Colormap          default_colormap;

  unsigned long    *color_pixels;
  unsigned long    *gray_pixels;
  unsigned long    *reserved_pixels;

  unsigned long     red_shift;
  unsigned long     red_prec;
  unsigned long     blue_shift;
  unsigned long     blue_prec;
  unsigned long     green_shift;
  unsigned long     green_prec;

  unsigned int      nred_shades;
  unsigned int      ngreen_shades;
  unsigned int      nblue_shades;
  unsigned int      ngray_shades;
  unsigned int      nreserved;

  unsigned int      bpp; /* bytes per pixel */
  unsigned int      cmap_alloced;
  double            gamma_val;

  /* Generally, the stage buffer is used to convert 32bit RGB, gray,
     and indexed images into 24 bit packed RGB. */
  unsigned char *stage_buf;

  XlibRgbCmap *gray_cmap;

  Bool dith_default;

  Bool bitmap; /* set true if in 1 bit per pixel mode */
  GC own_gc;

  /* Convert functions */
  XlibRgbConvFunc conv;
  XlibRgbConvFunc conv_d;

  XlibRgbConvFunc conv_32;
  XlibRgbConvFunc conv_32_d;

  XlibRgbConvFunc conv_gray;
  XlibRgbConvFunc conv_gray_d;

  XlibRgbConvFunc conv_indexed;
  XlibRgbConvFunc conv_indexed_d;

  /* misc */
  Bool            xlib_rgb_install_cmap; /* default: FALSE */
  Bool            xlib_rgb_verbose;      /* default: FALSE */
  XImage         *static_image[N_IMAGES];
  int             static_image_idx;
  char           *static_buffer;
  
  uint32         *DM_565;

  unsigned char  *colorcube;
  unsigned char  *colorcube_d;
 
  int             xlib_rgb_min_colors;

  /* image tiling code... */
  Bool            disallow_image_tiling; /* default: FALSE */
  int             horiz_idx;
  int             horiz_y;
  int             vert_idx;
  int             vert_x;
  int             tile_idx;
  int             tile_x;
  int             tile_y1;
  int             tile_y2;

#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
  Bool            xlib_use_shm;
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */
  long            max_request_size;
};

static XImage *
xxlib_normal_ximage(XlibRgbHandle *handle)
{
  XImage *ximage;

  if (handle->bitmap) {
    ximage = XCreateImage(handle->display,
                          handle->x_visual_info->visual,
                          1,
                          XYBitmap,
                          0, 0, IMAGE_WIDTH, IMAGE_HEIGHT,
                          8,
                          0);
  }
  else 
  {  
    ximage = XCreateImage(handle->display,
                          handle->x_visual_info->visual,
                          (unsigned int)handle->x_visual_info->depth,
                          ZPixmap,
                          0, 0,
                          IMAGE_WIDTH,
                          IMAGE_HEIGHT,
                          32, 0);
  }

  if (!ximage)
    return NULL;
    
  ximage->data = malloc(ximage->height * ximage->bytes_per_line);
  if (!ximage->data)
  {
    XDestroyImage(ximage);
    return NULL;
  }
  
  ximage->bitmap_bit_order = MSBFirst;
  ximage->byte_order = MSBFirst;
    
  return ximage;
}

#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
static XImage *
xshm_image_new(XlibRgbHandle *handle)
{
  XShmSegmentInfo *shm_info;
  XImage          *ximage;
    
  shm_info = calloc(1, sizeof(XShmSegmentInfo));
  if (!shm_info)
    return NULL;
    
  shm_info->readOnly = True;

  if (handle->bitmap)
  {
    ximage = XShmCreateImage(handle->display,
                             handle->x_visual_info->visual,
                             1,
                             XYBitmap, NULL, shm_info, IMAGE_WIDTH, IMAGE_HEIGHT);
  }
  else
  {
    ximage = XShmCreateImage(handle->display,
                             handle->x_visual_info->visual,
                             (unsigned int)handle->x_visual_info->depth,
                             ZPixmap, NULL, shm_info, IMAGE_WIDTH, IMAGE_HEIGHT);
  }

  /* most likely shm extension is not loaded */
  if (!ximage)
  {
    free(shm_info);
    return NULL;
  }

  /* allocate a shm chunk of desired size... */
  shm_info->shmid = shmget(IPC_PRIVATE,
                           ximage->height * ximage->bytes_per_line,
                           IPC_CREAT | 0777);

  /* image is probably > SHMMAX */
  if (shm_info->shmid == -1)
  {
    XDestroyImage(ximage);
    free(shm_info);
    return NULL;
  }

  /* find out where in memory it was placed */
  shm_info->shmaddr = shmat(shm_info->shmid, NULL, 0);

  if (shm_info->shmaddr == (void *)-1) {
    XDestroyImage(ximage);
    shmctl(shm_info->shmid, IPC_RMID, NULL);
    free(shm_info);
    return NULL;
  }

  /* image data in shared memory */
  ximage->data = shm_info->shmaddr;
  XShmAttach(handle->display, shm_info);
  XSync(handle->display, False);

  /* set the shm segment as deleted so that it's deleted automatically */
  shmctl(shm_info->shmid, IPC_RMID, NULL);
  
  return ximage;
}
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */

static void
xxlib_image_put(XlibRgbHandle *handle,
               Drawable drawable, GC gc,
               XImage *image,
               int xsrc, int ysrc,
               int xdest, int ydest,
               int width, int height)
{
#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
  if (handle->xlib_use_shm)
  {
    XShmPutImage(handle->display, drawable,
                 gc, image,
                 xsrc, ysrc, xdest, ydest, width, height, False);
  }  
  else
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */  
  {
    XPutImage(handle->display, drawable, gc, image,
              xsrc, ysrc, xdest, ydest,
              (unsigned int)width, (unsigned int)height);
  }
}

#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
static void
xshm_image_check(XlibRgbHandle *handle, XlibRgbArgs *args)
{
  int dummy; 
  
  handle->xlib_use_shm = False;

  if(!args->disallow_mit_shmem)
    /* XlibRGB MIT-SHM support requires the image tiling hack */
    if(!args->disallow_image_tiling)
      if (getenv("MOZILLA_XXLIBRGB_DISABLE_MIT_SHM") == NULL)
        if (XShmQueryExtension(handle->display))
          if (XShmQueryVersion(handle->display,
                               &dummy, &dummy, &dummy) == True)
            handle->xlib_use_shm = True;
}
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */

unsigned long
xxlib_get_prec_from_mask(unsigned long val)
{
  unsigned long retval = 0;
  unsigned int cur_bit = 0;
  /* walk through the number, incrementing the value if
     the bit in question is set. */
  while (cur_bit < (sizeof(unsigned long) * 8)) {
    if ((val >> cur_bit) & 0x1) {
      retval++;
    }
    cur_bit++;
  }
  return retval;
}

unsigned long
xxlib_get_shift_from_mask(unsigned long val)
{
  unsigned long cur_bit = 0;
  /* walk through the number, looking for the first 1 */
  while (cur_bit < (sizeof(unsigned long) * 8)) {
    if ((val >> cur_bit) & 0x1) {
      return cur_bit;
    }
    cur_bit++;
  }
  return cur_bit;
}


static int
xxlib_rgb_cmap_fail (XlibRgbHandle *handle, const char *msg, Colormap cmap, unsigned long *pixels)
{
  unsigned long free_pixels[256];
  int n_free;
  int i;

#ifdef VERBOSE
  printf ("%s", msg);
#endif
  n_free = 0;
  for (i = 0; i < 256; i++)
    if (pixels[i] < 256)
      free_pixels[n_free++] = pixels[i];
  
  if (n_free)
    XFreeColors(handle->display,
                cmap,
                free_pixels,
                n_free,
                0);
  return 0;
}

static void
xxlib_rgb_make_colorcube (XlibRgbHandle *handle, unsigned long *pixels, int nr, int ng, int nb)
{
  unsigned char rt[16], gt[16], bt[16];
  int i;

  handle->colorcube = calloc(4096, 1);
  for (i = 0; i < 16; i++)
  {
    rt[i] = ng * nb * ((i * 17 * (nr - 1) + 128) >> 8);
    gt[i] = nb * ((i * 17 * (ng - 1) + 128) >> 8);
    bt[i] = ((i * 17 * (nb - 1) + 128) >> 8);
  }

  for (i = 0; i < 4096; i++)
  {
    handle->colorcube[i] = pixels[rt[i >> 8] + gt[(i >> 4) & 0x0f] + bt[i & 0x0f]];
#ifdef VERBOSE
    printf ("%03x %02x %x %x %x\n", i, handle->colorcube[i], rt[i >> 8], gt[(i >> 4) & 0x0f], bt[i & 0x0f]);
#endif
  }
}

/* this is the colorcube suitable for dithering */
static void
xxlib_rgb_make_colorcube_d (XlibRgbHandle *handle, unsigned long *pixels, int nr, int ng, int nb)
{
  int r, g, b;
  int i;

  handle->colorcube_d = calloc(512, 1);
  for (i = 0; i < 512; i++)
  {
    r = MIN (nr - 1, i >> 6);
    g = MIN (ng - 1, (i >> 3) & 7);
    b = MIN (nb - 1, i & 7);
    handle->colorcube_d[i] = pixels[(r * ng + g) * nb + b];
  }
}

/* Try installing a color cube of the specified size.
   Make the colorcube and return TRUE on success */
static int
xxlib_rgb_try_colormap (XlibRgbHandle *handle, int nr, int ng, int nb)
{
  int r, g, b;
  int ri, gi, bi;
  int r0, g0, b0;
  Colormap     cmap;
  XVisualInfo *visual;
  XColor      *colors = NULL;
  XColor       color;
  unsigned long pixels[256];
  unsigned long junk[256];
  int i;
  int d2;
  unsigned int colors_needed;
  int idx;
  int best[256];

  if (nr * ng * nb < handle->xlib_rgb_min_colors)
    return FALSE;

  if (handle->cmap_alloced) {
    cmap = handle->cmap;
    visual = handle->x_visual_info;
  }
  else {
    cmap = handle->default_colormap;
    visual = handle->x_visual_info;
  }
  colors_needed = nr * ng * nb;
  for (i = 0; i < 256; i++)
  {
    best[i] = 192;
    pixels[i] = 256;
  }

#ifndef GAMMA
  if (!handle->xlib_rgb_install_cmap) {
    /* go out and get the colors for this colormap. */
    colors = malloc(sizeof(XColor) * visual->colormap_size);
    for (i=0; i < visual->colormap_size; i++){
      colors[i].pixel = i;
    }
    XQueryColors (handle->display,
                  cmap,
                  colors, visual->colormap_size);
    /* find color cube colors that are already present */
    for (i = 0; i < MIN (256, visual->colormap_size); i++)
    {
      r = colors[i].red >> 8;
      g = colors[i].green >> 8;
      b = colors[i].blue >> 8;
      ri = (r * (nr - 1) + 128) >> 8;
      gi = (g * (ng - 1) + 128) >> 8;
      bi = (b * (nb - 1) + 128) >> 8;
      r0 = ri * 255 / (nr - 1);
      g0 = gi * 255 / (ng - 1);
      b0 = bi * 255 / (nb - 1);
      idx = ((ri * nr) + gi) * nb + bi;
      d2 = (r - r0) * (r - r0) + (g - g0) * (g - g0) + (b - b0) * (b - b0);
      if (d2 < best[idx]) 
      {
        if (pixels[idx] < 256)
        XFreeColors(handle->display,
                    cmap,
                    pixels + idx,
                    1, 0);
        else
          colors_needed--;
        color.pixel = colors[i].pixel;
        color.red = colors[i].red;
        color.green = colors[i].green;
        color.blue = colors[i].blue;
        color.flags = 0;
        if (!XAllocColor(handle->display, cmap, &color))
          return xxlib_rgb_cmap_fail (handle, "error allocating system color\n",
        cmap, pixels);
        pixels[idx] = color.pixel; /* which is almost certainly i */
        best[idx] = d2;
      }
    }
  }

#endif /* !GAMMA */

  if (colors_needed)
  {
    if (!XAllocColorCells(handle->display, cmap, 0, NULL, 0, junk, colors_needed))
    {
      char tmp_str[80];
      
      sprintf (tmp_str,
               "%d %d %d colormap failed (in XAllocColorCells)\n",
               nr, ng, nb);
      return xxlib_rgb_cmap_fail (handle, tmp_str, cmap, pixels);
    }
    XFreeColors(handle->display, cmap, junk, (int)colors_needed, 0);
  }

  for (r = 0, i = 0; r < nr; r++)
    for (g = 0; g < ng; g++)
      for (b = 0; b < nb; b++, i++)
      {
        if (pixels[i] == 256)
          {
            color.red = r * 65535 / (nr - 1);
            color.green = g * 65535 / (ng - 1);
            color.blue = b * 65535 / (nb - 1);

#ifdef GAMMA
            color.red = 65535 * pow (color.red / 65535.0, 0.5);
            color.green = 65535 * pow (color.green / 65535.0, 0.5);
            color.blue = 65535 * pow (color.blue / 65535.0, 0.5);
#endif /* GAMMA */

            /* This should be a raw XAllocColor call */
            if (!XAllocColor(handle->display, cmap, &color))
            {
              char tmp_str[80];

              sprintf (tmp_str, "%d %d %d colormap failed\n",
                       nr, ng, nb);
              return xxlib_rgb_cmap_fail (handle, tmp_str,
                                          cmap, pixels);
            }
            pixels[i] = color.pixel;
          }
#ifdef VERBOSE
          printf ("%d: %lx\n", i, pixels[i]);
#endif /* VERBOSE */
        }

  handle->nred_shades = nr;
  handle->ngreen_shades = ng;
  handle->nblue_shades = nb;
  xxlib_rgb_make_colorcube (handle, pixels, nr, ng, nb);
  xxlib_rgb_make_colorcube_d (handle, pixels, nr, ng, nb);
  if (colors)
    free(colors);
  return TRUE;
}

/* Return TRUE on success. */
static Bool
xxlib_rgb_do_colormaps (XlibRgbHandle *handle)
{
  static const int sizes[][3] = 
  {
    /*    { 6, 7, 6 }, */
    { 6, 6, 6 }, 
    { 6, 6, 5 }, 
    { 6, 6, 4 }, 
    { 5, 5, 5 }, 
    { 5, 5, 4 }, 
    { 4, 4, 4 }, 
    { 4, 4, 3 }, 
    { 3, 3, 3 }, 
    { 2, 2, 2 }
  };
  static const int n_sizes = sizeof(sizes) / (3 * sizeof(int));
  int i;
  
  for (i = 0; i < n_sizes; i++)
    if (xxlib_rgb_try_colormap (handle, sizes[i][0], sizes[i][1], sizes[i][2]))
      return TRUE;
  return FALSE;
}

/* Make a 2 x 2 x 2 colorcube */
static void
xxlib_rgb_colorcube_222 (XlibRgbHandle *handle)
{
  int i;
  XColor color;
  Colormap cmap;

  if (handle->cmap_alloced)
    cmap = handle->cmap;
  else
    cmap = handle->default_colormap;

  handle->colorcube_d = malloc(sizeof(unsigned char) * 512);

  for (i = 0; i < 8; i++)
  {
    color.red = ((i & 4) >> 2) * 65535;
    color.green = ((i & 2) >> 1) * 65535;
    color.blue = (i & 1) * 65535;
    XAllocColor (handle->display, cmap, &color);
    handle->colorcube_d[((i & 4) << 4) | ((i & 2) << 2) | (i & 1)] = color.pixel;
  }
}

/* Make a 6 x 7 x 6 colorcube */
static void
xxlib_rgb_colorcube_676 (XlibRgbHandle *handle)
{
  int i = 0;
  XColor color;
  Colormap cmap;
  int r, g, b, r_max, g_max, b_max;
  unsigned long pixels[256];
  
  r_max = 6;
  g_max = 7;
  b_max = 6;

  if (handle->cmap_alloced)
    cmap = handle->cmap;
  else
    cmap = handle->default_colormap;

  for (r = 0; r < r_max; r++)
  {
    for (g = 0; g < g_max; g++)
    {
      for (b = 0; b < b_max; b++)
      {        
        color.red   = r * 65535 / (r_max-1);
        color.green = g * 65535 / (g_max-1);
        color.blue  = b * 65535 / (b_max-1);
        XAllocColor (handle->display, cmap, &color);
        pixels[i++] = color.pixel;
      }
    }
  }    
      
  handle->nred_shades   = r_max;
  handle->ngreen_shades = g_max;
  handle->nblue_shades  = b_max;
  xxlib_rgb_make_colorcube   (handle, pixels, r_max, g_max, b_max);
  xxlib_rgb_make_colorcube_d (handle, pixels, r_max, g_max, b_max);      
}

void
xxlib_rgb_set_verbose (XlibRgbHandle *handle, Bool verbose)
{
  handle->xlib_rgb_verbose = verbose;
}

void
xxlib_rgb_set_min_colors (XlibRgbHandle *handle, int min_colors)
{
  handle->xlib_rgb_min_colors = min_colors;
}

/* Return a "score" based on the following criteria (in hex):

   x000 is the quality - 1 is 1bpp, 2 is 4bpp,
                         4 is 8bpp,
                         7 is 15bpp truecolor, 8 is 16bpp truecolor,
                         9 is 24bpp truecolor.
   0x00 is the speed - 1 is the normal case,
                       2 means faster than normal
   00x0 gets a point for being the system visual
   000x gets a point for being pseudocolor

   A caveat: in the 8bpp modes, being the system visual seems to be
   quite important. Thus, all of the 8bpp modes should be ranked at
   the same speed.
*/

static uint32
xxlib_rgb_score_visual (XlibRgbHandle *handle, XVisualInfo *visual)
{
  uint32 quality, speed, pseudo, sys;
#ifdef DEBUG
  static const char* visual_names[] =
  {
    "static gray",
    "grayscale",
    "static color",
    "pseudo color",
    "true color",
    "direct color",
  };
#endif /* DEBUG */
  
  quality = 0;
  speed = 1;
  sys = 0;
  if (visual->class == TrueColor ||
      visual->class == DirectColor)
  {
    if (visual->depth == 24)
    {
      quality = 9;
      /* Should test for MSB visual here, and set speed if so. */
    }
    else if (visual->depth == 16)
      quality = 8;
    else if (visual->depth == 15)
      quality = 7;
    else if (visual->depth == 8)
      quality = 4;
    }
    else if (visual->class == PseudoColor ||
           visual->class == StaticColor)
    {
      if (visual->depth == 8)
        quality = 4;
      else if (visual->depth == 4)
        quality = 2;
      else if (visual->depth == 1)
        quality = 1;
    }
  else if (visual->class == StaticGray
#ifdef ENABLE_GRAYSCALE
           || visual->class == GrayScale
#endif /* ENABLE_GRAYSCALE */
           )
    {
      if (visual->depth == 8)
        quality = 4;
      else if (visual->depth == 4)
        quality = 2;
      else if (visual->depth == 1)
        quality = 1;
    }

  if (quality == 0)
    return 0;

  sys = (visual->visualid == handle->default_visualid->visualid);
  
  pseudo = (visual->class == PseudoColor || visual->class == TrueColor);

#ifdef DEBUG
  if (handle->xlib_rgb_verbose)
    printf ("Visual 0x%x, type = %s, depth = %d, %ld:%ld:%ld%s; score=%x\n",
            (int)visual->visualid,
            visual_names[visual->class],
            visual->depth,
            visual->red_mask,
            visual->green_mask,
            visual->blue_mask,
            sys ? " (system)" : "",
            (quality << 12) | (speed << 8) | (sys << 4) | pseudo);
#endif /* DEBUG */
  return (quality << 12) | (speed << 8) | (sys << 4) | pseudo;
}

static Bool
xxlib_rgb_choose_visual (XlibRgbHandle *handle, XVisualInfo *xtemplate, long xtemplate_mask)
{
  XVisualInfo *visuals;
  XVisualInfo *visual;
  XVisualInfo *best_visual;
  XVisualInfo *final_visual;
  int num_visuals;
  uint32 score, best_score;
  int cur_visual = 1;
  int i;
   
  xtemplate_mask |= VisualScreenMask;
  xtemplate->screen = handle->screen_num;
  visuals = XGetVisualInfo(handle->display, xtemplate_mask,
                           xtemplate, &num_visuals);
  if (!visuals)
    return False;
    
  best_visual = visuals;
  best_score = xxlib_rgb_score_visual (handle, best_visual);

  for (i = cur_visual; i < num_visuals; i++)
  {
    visual = &visuals[i];
    score = xxlib_rgb_score_visual (handle, visual);
    if (score > best_score)
    {
      best_score = score;
      best_visual = visual;
    }
  }
  /* make a copy of the visual so that we can free
   * the allocated visual list above. */
  final_visual = malloc(sizeof(XVisualInfo));
  memcpy(final_visual, best_visual, sizeof(XVisualInfo));
  handle->x_visual_info = final_visual;
  XFree(visuals);
  
  return True;
}

static void xxlib_rgb_select_conv (XlibRgbHandle *handle, XImage *image, ByteOrder byte_order);

static void
xxlib_rgb_set_gray_cmap (XlibRgbHandle *handle, Colormap cmap)
{
  int i;
  XColor color;
  int status;
  unsigned long pixels[256];
  int r, g, b, gray;

  for (i = 0; i < 256; i++)
  {
    color.pixel = i;
    color.red   = i * 257;
    color.green = i * 257;
    color.blue  = i * 257;
    status = XAllocColor(handle->display, cmap, &color);
    pixels[i] = color.pixel;
#ifdef VERBOSE
    printf ("allocating pixel %d, %x %x %x, result %d\n",
            color.pixel, color.red, color.green, color.blue, status);
#endif /* VERBOSE */
  }

  /* Now, we make fake colorcubes - we ultimately just use the pseudocolor
     methods. */

  handle->colorcube = handle->colorcube_d = malloc(sizeof(unsigned char) * 4096);

  for (i = 0; i < 4096; i++)
  {
    r = (i >> 4) & 0xf0;
    r = r | r >> 4;
    g = i & 0xf0;
    g = g | g >> 4;
    b = (i << 4 & 0xf0);
    b = b | b >> 4;
    gray = (g + ((r + b) >> 1)) >> 1;
    handle->colorcube[i] = handle->colorcube_d[i] = pixels[gray];
  }
}

void
xxlib_rgb_destroy_handle (XlibRgbHandle *handle)
{
  int i;

  for( i = 0 ; i < N_IMAGES ; i++ )
  {
    if (handle->static_image[i])
      XDestroyImage(handle->static_image[i]);
  }
  
  if (handle->cmap_alloced)
  {
    XFreeColormap(handle->display, handle->cmap);
  }
  
  if (handle->own_gc)
    XFreeGC(handle->display, handle->own_gc);
  
  if (handle->colorcube)
    free(handle->colorcube);

  if (handle->colorcube_d && (handle->colorcube_d != handle->colorcube))
    free(handle->colorcube_d);
  
  if (handle->DM_565)
    free(handle->DM_565);
  
  if (handle->stage_buf)
    free(handle->stage_buf);

  xxlib_deregister_handle_by_handle(handle);
  
#ifdef DEBUG
    /* force crash if someone tries to touch the handle... */
    memset(handle, 0, sizeof(XlibRgbHandle));
#endif  
            
  /* done... */
  free(handle); 
}

/* Create a XlibRgbHandle object
 * It is possible to register the handle automagically with a |name|.
 * Handle names must be unique, but it is possible to register a handle 
 * with more than one name via |xxlib_register_handle()|.
 */                     
XlibRgbHandle *
xxlib_rgb_create_handle(Display *display, Screen *screen,
                        XlibRgbArgs *args)
{
  XlibRgbHandle *handle = NULL;
  int i;
  static const int byte_order[1] = { 1 };

#ifdef DEBUG
  printf("xxlib_rgb_create_handle: pseudogray=%d, install_colormap=%d, "
         "disallow_image_tiling=%d, disallow_mit_shmem=%d, verbose=%d\n",
         (int)args->pseudogray,
         (int)args->install_colormap,
         (int)args->disallow_image_tiling,
         (int)args->disallow_mit_shmem,
         (int)args->verbose);
#endif /* DEBUG */

  /* check endian sanity */
#if G_BYTE_ORDER == G_BIG_ENDIAN
  if (((char *)byte_order)[0] == 1) {
    fprintf (stderr, "xxlib_rgb_create_handle_with_depth: "
             "compiled for big endian, but this is a little endian machine.\n\n");
    abort();
  }
#else
  if (((char *)byte_order)[0] != 1) {
    fprintf (stderr, "xxlib_rgb_create_handle_with_depth: "
             "compiled for little endian, but this is a big endian machine.\n\n");
    abort();
  }
#endif /* G_BYTE_ORDER == G_BIG_ENDIAN */

#ifndef XLIBRGB_MIT_SHM_SUPPORT_HAS_BEEN_FIXED
    /* We still have issues with MIT_SHM support on LSB platforms... ;-( */
    args->disallow_mit_shmem = True;
#endif /* XLIBRGB_MIT_SHM_SUPPORT_HAS_BEEN_FIXED */    
       
    if (!(handle = malloc(sizeof(XlibRgbHandle))))
      return NULL;      
    memset(handle, 0, sizeof(XlibRgbHandle));

    /* should we register this handle ? */
    if (args->handle_name)
    {
      if (!xxlib_register_handle(args->handle_name, handle))
      {
#ifdef DEBUG
        puts("xxlib_rgb_create_handle: cannot register handle");
#endif /* DEBUG */      
        free(handle);
        return NULL;
      }  
    }
    
    /* Emulate StaticGray via PseudoColor visual ? */
    if (args->pseudogray)
    {
      args->xtemplate.class = PseudoColor;
      args->xtemplate.depth = 8;
      args->xtemplate_mask |= VisualClassMask|VisualDepthMask;
    } 
        
    handle->display = display;
    handle->screen = screen;
    handle->screen_num = XScreenNumberOfScreen(screen);
    handle->x_visual_info = NULL;
    handle->cmap = None;
    handle->default_visualid = XDefaultVisual(display, handle->screen_num);
    handle->default_colormap = XDefaultColormap(display, handle->screen_num);
    handle->max_request_size = XMaxRequestSize(display);

#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
    xshm_image_check(handle, args);
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */
    handle->disallow_image_tiling  = args->disallow_image_tiling;
    handle->xlib_rgb_install_cmap  = args->install_colormap;
    
    handle->color_pixels = NULL;
    handle->gray_pixels = NULL;
    handle->reserved_pixels = NULL;

    handle->nred_shades = 6;
    handle->ngreen_shades = 6;
    handle->nblue_shades = 4;
    handle->ngray_shades = 24;
    handle->nreserved = 0;

    handle->bpp = 0;
    handle->cmap_alloced = False;
    handle->gamma_val = 1.0;

    handle->stage_buf = NULL;

    handle->own_gc = None;
    
    handle->red_shift = 0;
    handle->red_prec = 0;
    handle->green_shift = 0;
    handle->green_prec = 0;
    handle->blue_shift = 0;
    handle->blue_prec = 0;

    handle->xlib_rgb_min_colors = 5 * 5 * 5;

    handle->horiz_y = IMAGE_HEIGHT;
    handle->vert_x  = IMAGE_WIDTH;
    handle->tile_x  = IMAGE_WIDTH;
    handle->tile_y1 = IMAGE_HEIGHT;
    handle->tile_y2 = IMAGE_HEIGHT;  

    if (!xxlib_rgb_choose_visual (handle, &args->xtemplate, args->xtemplate_mask))
    {
#ifdef DEBUG
      puts("xxlib_rgb_choose_visual failure");
#endif /* DEBUG */
      xxlib_rgb_destroy_handle(handle);
      return NULL;
    }

    handle->bitmap = (handle->x_visual_info->depth == 1);
      
    /* set up the shift and the precision for the red, green and blue.
       this only applies to cool visuals like true color and direct color. */
    if (handle->x_visual_info->class == TrueColor ||
        handle->x_visual_info->class == DirectColor) {
      handle->red_shift   = xxlib_get_shift_from_mask(handle->x_visual_info->red_mask);
      handle->red_prec    = xxlib_get_prec_from_mask(handle->x_visual_info->red_mask);
      handle->green_shift = xxlib_get_shift_from_mask(handle->x_visual_info->green_mask);
      handle->green_prec  = xxlib_get_prec_from_mask(handle->x_visual_info->green_mask);
      handle->blue_shift  = xxlib_get_shift_from_mask(handle->x_visual_info->blue_mask);
      handle->blue_prec   = xxlib_get_prec_from_mask(handle->x_visual_info->blue_mask);
    }
    
    if (args->pseudogray)
    {
      if (handle->xlib_rgb_install_cmap)
      {
        handle->cmap = XCreateColormap(handle->display,
                                       XRootWindow(handle->display, handle->screen_num),
                                       handle->x_visual_info->visual,
                                       AllocNone);
        xxlib_rgb_set_gray_cmap (handle, handle->cmap);
        handle->cmap_alloced = TRUE;
      }
      else
      {
        handle->cmap = handle->default_colormap;
        xxlib_rgb_set_gray_cmap (handle, handle->cmap);
      }  
    }
    else if ((handle->x_visual_info->class == PseudoColor ||
           handle->x_visual_info->class == StaticColor) &&
           handle->x_visual_info->depth < 8 &&
           handle->x_visual_info->depth >= 3)
    {
      handle->cmap = handle->default_colormap;
      xxlib_rgb_colorcube_222 (handle);
    }
    else if (handle->x_visual_info->class == StaticColor)
    {
      handle->cmap = XCreateColormap(handle->display,
                                     XRootWindow(handle->display, handle->screen_num),
                                     handle->x_visual_info->visual,
                                     AllocNone);
      handle->cmap_alloced = TRUE;
      xxlib_rgb_colorcube_676(handle);
    }
    else if (handle->x_visual_info->class == PseudoColor)
    {
      if (handle->xlib_rgb_install_cmap ||
          handle->x_visual_info->visualid != handle->default_visualid->visualid)
      {
        handle->cmap = XCreateColormap(handle->display,
                                       XRootWindow(handle->display, handle->screen_num),
                                       handle->x_visual_info->visual,
                                       AllocNone);
        handle->cmap_alloced = TRUE;
      }
      
      if (!xxlib_rgb_do_colormaps (handle))
      {
        handle->cmap = XCreateColormap(handle->display,
                                       XRootWindow(handle->display, handle->screen_num),
                                       handle->x_visual_info->visual,
                                       AllocNone);
        handle->cmap_alloced = TRUE;
        xxlib_rgb_do_colormaps (handle);
      }
      if (handle->xlib_rgb_verbose)
        printf ("color cube: %d x %d x %d\n",
                handle->nred_shades,
                handle->ngreen_shades,
                handle->nblue_shades);

      if (!handle->cmap_alloced)
        handle->cmap = handle->default_colormap;
     }
#ifdef ENABLE_GRAYSCALE
    else if (handle->x_visual_info->class == GrayScale)
    {
      handle->cmap = XCreateColormap(handle->display,
                                     XRootWindow(handle->display, handle->screen_num),
                                     handle->x_visual_info->visual,
                                     AllocNone);
      xxlib_rgb_set_gray_cmap (handle, handle->cmap);
      handle->cmap_alloced = TRUE;
    }
#endif /* ENABLE_GRAYSCALE */
    else if (handle->x_visual_info->class != DirectColor && 
             handle->x_visual_info->visualid == handle->default_visualid->visualid)
    {
      handle->cmap = handle->default_colormap;
    }  
    else
    {
      /* Always install colormap in direct color. */
      handle->cmap = XCreateColormap(handle->display,
                                     XRootWindow(handle->display, handle->screen_num),
                                     handle->x_visual_info->visual,
                                     AllocNone);
      handle->cmap_alloced = TRUE;
    }

#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
    if (handle->xlib_use_shm)
    {
      /* try to allocate N_IMAGES shm X images */
      for (i = 0; i < N_IMAGES; i++)
      {
        handle->static_image[i] = xshm_image_new(handle);
        if (!handle->static_image[i])
        {
          handle->xlib_use_shm = False;
          break;
        }
      }
      
      /* Failure ? Then clean-up and use the standard method below... */
      if (!handle->xlib_use_shm)
      {
#ifdef DEBUG
        printf("Failed to set-up MIT-SHMEM after %d images\n", i);
#endif /* DEBUG */
        for (i = 0; i < N_IMAGES; i++)
        {
          if (handle->static_image[i])
          {
            XDestroyImage(handle->static_image[i]);
            handle->static_image[i] = NULL;
          }  
        } 
      }
    }  

    /* Allocate "normal" images "*/
    if (!handle->xlib_use_shm)
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */
    {    
      for (i = 0; i < N_IMAGES; i++) 
      {
        handle->static_image[i] = xxlib_normal_ximage(handle);
      }
    }  

    /* ok, so apparently, handle->bpp is actually
     * BYTES per pixel.  What fun! */
    handle->bpp = (handle->static_image[0]->bits_per_pixel + 7) / 8;

    xxlib_rgb_select_conv (handle, handle->static_image[0], MSB_FIRST);
    
    return handle;
}

/* convert an rgb value into an X pixel code */
unsigned long
xxlib_rgb_xpixel_from_rgb (XlibRgbHandle *handle, uint32 rgb)
{
  unsigned long pixel = 0;

  if (handle->bitmap)
  {
    return ((rgb & 0xff0000) >> 16) +
           ((rgb & 0xff00) >> 7) +
            (rgb & 0xff) > 510;
  }
  else if (handle->x_visual_info->class == PseudoColor)
    pixel = handle->colorcube[((rgb & 0xf00000) >> 12) |
                              ((rgb & 0xf000) >> 8) |
                              ((rgb & 0xf0) >> 4)];
  else if (handle->x_visual_info->depth < 8 &&
           handle->x_visual_info->class == StaticColor)
  {
    pixel = handle->colorcube_d[((rgb & 0x800000) >> 17) |
                                ((rgb & 0x8000) >> 12) |
                                ((rgb & 0x80) >> 7)];
  }
  else if (handle->x_visual_info->class == StaticColor)
  {
    pixel = handle->colorcube[((rgb & 0xf00000) >> 12) |
                              ((rgb & 0xf000) >> 8) |
                              ((rgb & 0xf0) >> 4)];  
  }
  else if (handle->x_visual_info->class == TrueColor ||
           handle->x_visual_info->class == DirectColor)
  {
#ifdef VERBOSE
    printf ("shift, prec: r %d %d g %d %d b %d %d\n",
            handle->red_shift,
            handle->red_prec,
            handle->green_shift,
            handle->green_prec,
            handle->blue_shift,
            handle->blue_prec);
#endif

    pixel = (((((rgb & 0xff0000) >> 16) >>
               (8 - handle->red_prec)) <<
              handle->red_shift) +
             ((((rgb & 0xff00) >> 8)  >>
               (8 - handle->green_prec)) <<
              handle->green_shift) +
             (((rgb & 0xff) >>
               (8 - handle->blue_prec)) <<
              handle->blue_shift));
  }
  else if (handle->x_visual_info->class == StaticGray ||
           handle->x_visual_info->class == GrayScale)
  {
    int gray = ((rgb & 0xff0000) >> 16) +
               ((rgb & 0xff00) >> 7) +
                (rgb & 0xff);

    return gray >> (10 - handle->x_visual_info->depth);
  }

  return pixel;
}

void
xxlib_rgb_gc_set_foreground (XlibRgbHandle *handle, GC gc, uint32 rgb)
{
  unsigned long color;

  color = xxlib_rgb_xpixel_from_rgb (handle, rgb);
  XSetForeground(handle->display, gc, color);
}

void
xxlib_rgb_gc_set_background (XlibRgbHandle *handle, GC gc, uint32 rgb)
{
  unsigned long color;

  color = xxlib_rgb_xpixel_from_rgb (handle, rgb);
  XSetBackground(handle->display, gc, color);
}

#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define HAIRY_CONVERT_8
#endif

#ifdef HAIRY_CONVERT_8
static void
xxlib_rgb_convert_8 (XlibRgbHandle *handle, XImage *image,
                   int ax, int ay, int width, int height,
                   unsigned char *buf, int rowstride,
                   int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
        {
          for (x = 0; x < width; x++)
            {
              r = *bp2++;
              g = *bp2++;
              b = *bp2++;
              obptr[0] = handle->colorcube[((r & 0xf0) << 4) |
                                  (g & 0xf0) |
                                  (b >> 4)];
              obptr++;
            }
        }
      else
        {
          for (x = 0; x < width - 3; x += 4)
            {
              uint32 r1b0g0r0;
              uint32 g2r2b1g1;
              uint32 b3g3r3b2;

              r1b0g0r0 = ((uint32 *)bp2)[0];
              g2r2b1g1 = ((uint32 *)bp2)[1];
              b3g3r3b2 = ((uint32 *)bp2)[2];
              ((uint32 *)obptr)[0] =
                handle->colorcube[((r1b0g0r0 & 0xf0) << 4) | 
                         ((r1b0g0r0 & 0xf000) >> 8) |
                         ((r1b0g0r0 & 0xf00000) >> 20)] |
                (handle->colorcube[((r1b0g0r0 & 0xf0000000) >> 20) |
                          (g2r2b1g1 & 0xf0) |
                          ((g2r2b1g1 & 0xf000) >> 12)] << 8) |
                (handle->colorcube[((g2r2b1g1 & 0xf00000) >> 12) |
                          ((g2r2b1g1 & 0xf0000000) >> 24) |
                          ((b3g3r3b2 & 0xf0) >> 4)] << 16) |
                (handle->colorcube[((b3g3r3b2 & 0xf000) >> 4) |
                          ((b3g3r3b2 & 0xf00000) >> 16) |
                          (b3g3r3b2 >> 28)] << 24);
              bp2 += 12;
              obptr += 4;
            }
          for (; x < width; x++)
            {
              r = *bp2++;
              g = *bp2++;
              b = *bp2++;
              obptr[0] = handle->colorcube[((r & 0xf0) << 4) |
                                  (g & 0xf0) |
                                  (b >> 4)];
              obptr++;
            }
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#else
static void
xxlib_rgb_convert_8 (XlibRgbHandle *handle, XImage *image,
                   int ax, int ay, int width, int height,
                   unsigned char *buf, int rowstride,
                   int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          obptr[0] = handle->colorcube[((r & 0xf0) << 4) |
                              (g & 0xf0) |
                              (b >> 4)];
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#endif

#if 1

/* This dither table was generated by Raph Levien using patented
   technology (US Patent 5,276,535). The dither table itself is in the
   public domain. */

#define DM_WIDTH 128
#define DM_WIDTH_SHIFT 7
#define DM_HEIGHT 128
static const unsigned char DM[128][128] =
{
  { 0, 41, 23, 5, 17, 39, 7, 15, 62, 23, 40, 51, 31, 47, 9, 32, 52, 27, 57, 25, 6, 61, 27, 52, 37, 7, 40, 63, 18, 36, 10, 42, 25, 62, 45, 34, 20, 42, 37, 14, 35, 29, 50, 10, 61, 2, 40, 8, 37, 12, 58, 22, 5, 41, 10, 39, 0, 60, 11, 46, 2, 55, 38, 17, 36, 59, 13, 54, 37, 56, 8, 29, 16, 13, 63, 22, 41, 55, 7, 20, 49, 14, 23, 55, 37, 23, 19, 36, 15, 49, 23, 63, 30, 14, 38, 27, 53, 13, 22, 41, 19, 31, 7, 19, 50, 30, 49, 16, 3, 32, 56, 40, 29, 34, 8, 48, 19, 45, 4, 51, 12, 46, 35, 49, 16, 42, 12, 62 },
  { 30, 57, 36, 54, 47, 34, 52, 27, 43, 4, 28, 7, 17, 36, 62, 13, 44, 7, 18, 48, 33, 21, 44, 14, 30, 47, 12, 33, 5, 55, 31, 58, 13, 30, 4, 17, 52, 10, 60, 26, 46, 0, 39, 27, 42, 22, 47, 25, 60, 32, 9, 38, 48, 17, 59, 30, 49, 18, 34, 25, 51, 19, 5, 48, 21, 8, 28, 46, 1, 32, 41, 19, 54, 47, 37, 18, 28, 11, 44, 30, 39, 56, 2, 33, 8, 42, 61, 28, 58, 8, 46, 9, 41, 4, 58, 7, 21, 48, 59, 10, 52, 14, 42, 57, 12, 25, 7, 53, 42, 24, 11, 50, 17, 59, 42, 2, 36, 60, 32, 17, 63, 29, 21, 7, 59, 32, 24, 39 },
  { 22, 8, 16, 32, 3, 25, 13, 57, 18, 45, 58, 39, 55, 20, 5, 42, 23, 34, 63, 1, 51, 10, 58, 4, 60, 23, 53, 27, 44, 21, 3, 48, 8, 50, 43, 54, 27, 32, 5, 55, 21, 58, 12, 53, 6, 36, 14, 50, 17, 29, 53, 15, 24, 52, 7, 36, 13, 42, 4, 53, 9, 35, 61, 26, 56, 32, 49, 15, 62, 23, 6, 60, 2, 31, 4, 48, 58, 38, 15, 61, 5, 25, 47, 28, 50, 15, 7, 40, 3, 32, 33, 52, 25, 50, 35, 42, 61, 3, 28, 36, 23, 63, 4, 33, 46, 62, 36, 23, 60, 6, 54, 28, 4, 37, 23, 55, 25, 8, 42, 54, 14, 6, 56, 38, 19, 52, 4, 46 },
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  { 30, 62, 18, 55, 5, 23, 39, 29, 49, 30, 15, 36, 28, 46, 60, 25, 39, 46, 4, 32, 61, 40, 15, 30, 36, 45, 14, 2, 49, 33, 57, 45, 18, 32, 3, 45, 30, 2, 35, 52, 40, 27, 13, 21, 38, 63, 20, 28, 37, 23, 16, 10, 13, 55, 2, 62, 21, 32, 60, 17, 58, 23, 5, 40, 16, 48, 7, 45, 10, 26, 43, 19, 6, 31, 52, 21, 39, 16, 48, 9, 37, 28, 36, 55, 7, 48, 3, 59, 15, 45, 25, 1, 53, 13, 47, 7, 62, 15, 4, 25, 12, 41, 18, 60, 38, 11, 34, 19, 39, 31, 29, 56, 23, 42, 3, 27, 60, 41, 8, 16, 61, 29, 43, 9, 32, 2, 60, 34 },
  { 3, 38, 13, 37, 52, 44, 2, 19, 12, 42, 63, 19, 40, 1, 20, 50, 12, 55, 15, 56, 27, 1, 54, 11, 57, 18, 32, 63, 44, 4, 29, 13, 37, 61, 35, 16, 42, 57, 12, 22, 6, 55, 43, 10, 50, 5, 44, 11, 48, 52, 34, 58, 28, 41, 38, 30, 7, 52, 11, 49, 30, 14, 45, 27, 59, 34, 21, 38, 32, 58, 11, 36, 56, 42, 9, 41, 3, 54, 31, 42, 0, 60, 16, 11, 39, 24, 52, 33, 6, 36, 10, 40, 32, 60, 26, 20, 39, 28, 47, 34, 63, 8, 54, 3, 24, 56, 0, 51, 13, 47, 16, 40, 7, 35, 52, 11, 36, 4, 57, 30, 39, 13, 18, 50, 58, 28, 12, 48 },
  { 57, 24, 49, 21, 10, 31, 61, 36, 56, 0, 22, 53, 11, 56, 32, 7, 36, 27, 41, 9, 46, 19, 34, 42, 25, 7, 50, 9, 28, 21, 54, 8, 50, 7, 27, 59, 10, 25, 48, 62, 37, 0, 33, 58, 25, 18, 32, 61, 0, 15, 45, 5, 50, 3, 23, 55, 47, 17, 40, 6, 60, 34, 53, 8, 41, 0, 61, 13, 54, 4, 46, 28, 0, 17, 48, 27, 58, 13, 23, 61, 33, 21, 50, 30, 62, 8, 14, 29, 56, 27, 61, 49, 17, 2, 44, 11, 51, 0, 59, 17, 40, 20, 32, 47, 36, 21, 42, 28, 60, 4, 54, 10, 59, 17, 30, 62, 21, 43, 26, 48, 0, 56, 36, 25, 8, 44, 39, 17 },
  { 10, 42, 4, 59, 27, 47, 8, 23, 51, 32, 45, 6, 37, 26, 48, 43, 62, 0, 21, 53, 38, 12, 51, 5, 60, 47, 24, 37, 59, 15, 35, 47, 22, 55, 0, 50, 21, 40, 6, 29, 15, 52, 24, 8, 41, 55, 13, 29, 40, 56, 24, 31, 19, 33, 61, 15, 0, 35, 24, 42, 21, 2, 19, 57, 24, 15, 30, 50, 20, 25, 40, 16, 57, 34, 61, 8, 29, 45, 6, 49, 11, 47, 2, 44, 19, 57, 38, 50, 12, 42, 21, 4, 35, 52, 28, 56, 23, 36, 13, 45, 4, 52, 27, 14, 6, 62, 9, 45, 21, 37, 25, 46, 33, 49, 0, 44, 7, 53, 13, 19, 53, 31, 3, 47, 15, 56, 22, 51 },
  { 35, 28, 53, 32, 1, 16, 54, 40, 9, 17, 25, 58, 14, 59, 3, 22, 16, 51, 31, 5, 23, 58, 28, 17, 35, 20, 0, 42, 11, 52, 3, 31, 41, 17, 43, 13, 32, 54, 18, 60, 32, 45, 17, 49, 2, 36, 51, 22, 7, 36, 9, 63, 48, 12, 46, 26, 43, 28, 63, 13, 48, 37, 51, 33, 5, 47, 55, 9, 42, 63, 7, 51, 24, 12, 37, 19, 55, 34, 18, 38, 15, 28, 54, 34, 5, 43, 22, 0, 48, 14, 54, 24, 58, 9, 38, 5, 32, 55, 21, 30, 49, 9, 59, 43, 30, 51, 35, 26, 7, 53, 2, 22, 14, 27, 57, 18, 38, 24, 33, 45, 10, 41, 20, 60, 37, 5, 32, 0 },
  { 63, 19, 15, 40, 62, 35, 14, 28, 46, 61, 4, 49, 35, 10, 29, 54, 33, 8, 45, 62, 37, 1, 43, 55, 10, 52, 61, 30, 19, 40, 25, 62, 11, 38, 27, 58, 36, 3, 46, 8, 39, 4, 62, 28, 47, 20, 4, 54, 47, 27, 43, 1, 21, 38, 8, 58, 10, 54, 4, 56, 9, 26, 12, 39, 60, 27, 18, 37, 1, 31, 35, 5, 45, 50, 2, 43, 26, 1, 59, 23, 56, 40, 7, 26, 58, 17, 32, 63, 25, 39, 7, 31, 45, 19, 63, 15, 48, 8, 37, 61, 16, 34, 1, 56, 18, 3, 15, 58, 49, 32, 63, 41, 55, 5, 40, 22, 50, 6, 59, 2, 63, 23, 52, 11, 26, 61, 44, 23 },
  { 11, 56, 46, 6, 22, 43, 58, 3, 34, 21, 38, 30, 18, 44, 52, 13, 41, 57, 17, 28, 14, 49, 25, 7, 33, 39, 26, 6, 56, 48, 1, 20, 56, 5, 46, 9, 19, 51, 30, 25, 56, 21, 35, 14, 57, 42, 16, 33, 10, 57, 17, 59, 41, 25, 53, 37, 20, 40, 30, 18, 31, 62, 44, 22, 3, 44, 11, 48, 23, 53, 18, 60, 29, 22, 62, 15, 53, 47, 10, 41, 3, 19, 52, 36, 13, 46, 10, 35, 3, 61, 41, 16, 1, 50, 26, 42, 18, 46, 2, 25, 54, 20, 39, 23, 47, 31, 41, 12, 38, 17, 8, 19, 31, 48, 12, 61, 9, 54, 29, 35, 15, 38, 6, 43, 34, 14, 7, 47 },
  { 39, 2, 33, 26, 53, 8, 18, 50, 41, 12, 53, 1, 63, 24, 19, 39, 2, 24, 47, 10, 60, 38, 19, 63, 48, 4, 15, 45, 32, 14, 60, 36, 29, 53, 23, 63, 34, 12, 61, 1, 43, 11, 53, 30, 1, 26, 60, 45, 23, 39, 3, 29, 12, 50, 4, 16, 51, 3, 45, 36, 50, 1, 16, 54, 35, 14, 57, 30, 58, 9, 46, 14, 41, 10, 32, 38, 4, 30, 21, 51, 32, 63, 25, 1, 60, 27, 53, 18, 51, 22, 28, 55, 34, 12, 40, 3, 60, 29, 57, 41, 6, 44, 11, 53, 8, 61, 24, 57, 1, 28, 44, 59, 36, 3, 34, 25, 41, 31, 16, 44, 22, 47, 28, 58, 1, 49, 54, 29 },
  { 58, 25, 50, 13, 38, 30, 60, 24, 6, 57, 27, 42, 9, 45, 6, 61, 30, 50, 4, 34, 29, 3, 46, 13, 22, 42, 58, 28, 9, 39, 23, 44, 7, 15, 44, 2, 40, 15, 47, 41, 23, 37, 7, 59, 38, 11, 34, 6, 62, 14, 52, 35, 55, 19, 32, 61, 33, 24, 57, 6, 22, 59, 29, 7, 49, 25, 40, 3, 17, 39, 27, 52, 0, 55, 16, 57, 24, 61, 36, 6, 29, 12, 48, 39, 20, 44, 6, 40, 33, 5, 48, 10, 57, 36, 22, 51, 33, 9, 24, 12, 62, 29, 50, 35, 14, 43, 5, 33, 47, 52, 13, 23, 10, 51, 56, 16, 46, 1, 49, 4, 61, 9, 52, 18, 31, 21, 36, 17 },
  { 19, 42, 9, 48, 2, 44, 11, 37, 48, 20, 33, 16, 55, 35, 49, 15, 37, 20, 59, 16, 53, 22, 56, 31, 50, 11, 34, 54, 16, 51, 4, 49, 33, 53, 21, 28, 56, 24, 31, 9, 52, 16, 48, 24, 44, 13, 51, 20, 31, 49, 18, 6, 34, 2, 44, 14, 47, 8, 15, 43, 13, 41, 33, 52, 20, 61, 7, 51, 34, 62, 4, 20, 36, 33, 43, 8, 46, 13, 53, 17, 45, 42, 9, 31, 52, 11, 30, 56, 13, 59, 17, 44, 27, 6, 62, 11, 43, 17, 49, 38, 26, 2, 16, 27, 58, 21, 54, 18, 26, 5, 35, 61, 43, 27, 7, 39, 14, 58, 37, 55, 20, 33, 13, 40, 62, 10, 55, 5 },
  { 51, 14, 61, 29, 59, 20, 55, 31, 0, 49, 11, 60, 3, 26, 22, 56, 0, 40, 12, 43, 41, 8, 36, 0, 17, 57, 24, 2, 46, 26, 61, 18, 0, 38, 12, 59, 6, 49, 3, 57, 19, 63, 5, 33, 18, 54, 28, 56, 0, 43, 26, 46, 63, 27, 56, 22, 27, 54, 38, 28, 63, 24, 10, 45, 0, 31, 42, 21, 12, 25, 44, 49, 59, 6, 26, 50, 3, 34, 27, 59, 0, 35, 62, 16, 4, 58, 47, 0, 43, 24, 37, 2, 54, 20, 46, 31, 0, 56, 34, 5, 55, 45, 60, 37, 0, 40, 10, 38, 63, 46, 15, 20, 0, 53, 21, 62, 30, 11, 24, 27, 40, 0, 57, 26, 3, 45, 27, 35 },
};

#else
#define DM_WIDTH 8
#define DM_WIDTH_SHIFT 3
#define DM_HEIGHT 8
static const unsigned char DM[8][8] =
{
  { 0,  32, 8,  40, 2,  34, 10, 42 },
  { 48, 16, 56, 24, 50, 18, 58, 26 },
  { 12, 44, 4,  36, 14, 46, 6,  38 },
  { 60, 28, 52, 20, 62, 30, 54, 22 },
  { 3,  35, 11, 43, 1,  33, 9,  41 },
  { 51, 19, 59, 27, 49, 17, 57, 25 },
  { 15, 47, 7,  39, 13, 45, 5,  37 },
  { 63, 31, 55, 23, 61, 29, 53, 21 }
};
#endif


static void
xxlib_rgb_preprocess_dm_565 (XlibRgbHandle *handle)
{
  int i;
  uint32 dith;

  if (handle->DM_565 == NULL)
    {
      handle->DM_565 = malloc(sizeof(uint32) * DM_WIDTH * DM_HEIGHT);
      for (i = 0; i < DM_WIDTH * DM_HEIGHT; i++)
        {
          dith = DM[i / DM_WIDTH][i % DM_WIDTH] >> 3;
          handle->DM_565[i] = (dith << 20) | dith | (((7 - dith) >> 1) << 10);
#ifdef VERBOSE
          printf ("%i %x %x\n", i, dith, handle->DM_565[i]);
#endif
        }
    }
}

static void
xxlib_rgb_convert_8_d666 (XlibRgbHandle *handle, XImage *image,
                        int ax, int ay, int width, int height,
                        unsigned char *buf, int rowstride,
                        int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  const unsigned char *dmp;
  int dith;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) | 7;
          r = ((r * 5) + dith) >> 8;
          g = ((g * 5) + (262 - dith)) >> 8;
          b = ((b * 5) + dith) >> 8;
          obptr[0] = handle->colorcube_d[(r << 6) | (g << 3) | b];
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_8_d (XlibRgbHandle *handle, XImage *image,
                     int ax, int ay, int width, int height,
                     unsigned char *buf, int rowstride,
                     int x_align, int y_align,
                     XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  const unsigned char *dmp;
  int dith;
  int rs, gs, bs;

  bptr = buf;
  bpl = image->bytes_per_line;
  rs = handle->nred_shades - 1;
  gs = handle->ngreen_shades - 1;
  bs = handle->nblue_shades - 1;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) | 7;
          r = ((r * rs) + dith) >> 8;
          g = ((g * gs) + (262 - dith)) >> 8;
          b = ((b * bs) + dith) >> 8;
          obptr[0] = handle->colorcube_d[(r << 6) | (g << 3) | b];
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_8_indexed (XlibRgbHandle *handle, XImage *image,
                           int ax, int ay, int width, int height,
                           unsigned char *buf, int rowstride,
                           int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  unsigned char c;
  unsigned char *lut;

  lut = cmap->lut;
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          c = *bp2++;
          obptr[0] = lut[c];
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_gray8 (XlibRgbHandle *handle, XImage *image,
                       int ax, int ay, int width, int height,
                       unsigned char *buf, int rowstride,
                       int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          obptr[0] = (g + ((b + r) >> 1)) >> 1;
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_gray8_gray (XlibRgbHandle *handle, XImage *image,
                            int ax, int ay, int width, int height,
                            unsigned char *buf, int rowstride,
                            int x_align, int y_align, XlibRgbCmap *cmap)
{
  int y;
  int bpl;
  unsigned char *obuf;
  unsigned char *bptr;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      memcpy (obuf, bptr, (unsigned int)width);
      bptr += rowstride;
      obuf += bpl;
    }
}

#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define HAIRY_CONVERT_565
#endif

#ifdef HAIRY_CONVERT_565
/* Render a 24-bit RGB image in buf into the XImage, without dithering.
   This assumes native byte ordering - what should really be done is to
   check whether handle->static_image->byte_order is consistent with 
   the _ENDIAN config flag, and if not, use a different function.

   This one is even faster than the one below - its inner loop loads 3
   words (i.e. 4 24-bit pixels), does a lot of shifting and masking,
   then writes 2 words. */
static void
xxlib_rgb_convert_565 (XlibRgbHandle *handle, XImage *image,
                     int ax, int ay, int width, int height,
                     unsigned char *buf, int rowstride,
                     int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
        {
          for (x = 0; x < width; x++)
            {
              r = *bp2++;
              g = *bp2++;
              b = *bp2++;
              ((uint16 *)obptr)[0] = ((r & 0xf8) << 8) |
                ((g & 0xfc) << 3) |
                (b >> 3);
              obptr += 2;
            }
        }
      else
        {
          for (x = 0; x < width - 3; x += 4)
            {
              uint32 r1b0g0r0;
              uint32 g2r2b1g1;
              uint32 b3g3r3b2;

              r1b0g0r0 = ((uint32 *)bp2)[0];
              g2r2b1g1 = ((uint32 *)bp2)[1];
              b3g3r3b2 = ((uint32 *)bp2)[2];
              ((uint32 *)obptr)[0] =
                ((r1b0g0r0 & 0xf8) << 8) |
                ((r1b0g0r0 & 0xfc00) >> 5) |
                ((r1b0g0r0 & 0xf80000) >> 19) |
                (r1b0g0r0 & 0xf8000000) |
                ((g2r2b1g1 & 0xfc) << 19) |
                ((g2r2b1g1 & 0xf800) << 5);
              ((uint32 *)obptr)[1] =
                ((g2r2b1g1 & 0xf80000) >> 8) |
                ((g2r2b1g1 & 0xfc000000) >> 21) |
                ((b3g3r3b2 & 0xf8) >> 3) |
                ((b3g3r3b2 & 0xf800) << 16) |
                ((b3g3r3b2 & 0xfc0000) << 3) |
                ((b3g3r3b2 & 0xf8000000) >> 11);
              bp2 += 12;
              obptr += 8;
            }
          for (; x < width; x++)
            {
              r = *bp2++;
              g = *bp2++;
              b = *bp2++;
              ((uint16 *)obptr)[0] = ((r & 0xf8) << 8) |
                ((g & 0xfc) << 3) |
                (b >> 3);
              obptr += 2;
            }
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#else
/* Render a 24-bit RGB image in buf into the XImage, without dithering.
   This assumes native byte ordering - what should really be done is to
   check whether handle->static_image->byte_order is consistent with the
    _ENDIAN config flag, and if not, use a different function.

   This routine is faster than the one included with Gtk 1.0 for a number
   of reasons:

   1. Shifting instead of lookup tables (less memory traffic).

   2. Much less register pressure, especially because shifts are
   in the code.

   3. A memcpy is avoided (i.e. the transfer function).

   4. On big-endian architectures, byte swapping is avoided.

   That said, it wouldn't be hard to make it even faster - just make an
   inner loop that reads 3 words (i.e. 4 24-bit pixels), does a lot of
   shifting and masking, then writes 2 words.
*/
static void
xxlib_rgb_convert_565 (XlibRgbHandle *handle, XImage *image,
                     int ax, int ay, int width, int height,
                     unsigned char *buf, int rowstride,
                     int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          ((unsigned short *)obuf)[x] = ((r & 0xf8) << 8) |
            ((g & 0xfc) << 3) |
            (b >> 3);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#endif

#ifdef HAIRY_CONVERT_565
static void
xxlib_rgb_convert_565_gray (XlibRgbHandle *handle, XImage *image,
                          int ax, int ay, int width, int height,
                          unsigned char *buf, int rowstride,
                          int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char g;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
        {
          for (x = 0; x < width; x++)
            {
              g = *bp2++;
              ((uint16 *)obptr)[0] = ((g & 0xf8) << 8) |
                ((g & 0xfc) << 3) |
                (g >> 3);
              obptr += 2;
            }
        }
      else
        {
          for (x = 0; x < width - 3; x += 4)
            {
              uint32 g3g2g1g0;

              g3g2g1g0 = ((uint32 *)bp2)[0];
              ((uint32 *)obptr)[0] =
                ((g3g2g1g0 & 0xf8) << 8) |
                ((g3g2g1g0 & 0xfc) << 3) |
                ((g3g2g1g0 & 0xf8) >> 3) |
                (g3g2g1g0 & 0xf800) << 16 |
                ((g3g2g1g0 & 0xfc00) << 11) |
                ((g3g2g1g0 & 0xf800) << 5);
              ((uint32 *)obptr)[1] =
                ((g3g2g1g0 & 0xf80000) >> 8) |
                ((g3g2g1g0 & 0xfc0000) >> 13) |
                ((g3g2g1g0 & 0xf80000) >> 19) |
                (g3g2g1g0 & 0xf8000000) |
                ((g3g2g1g0 & 0xfc000000) >> 5) |
                ((g3g2g1g0 & 0xf8000000) >> 11);
              bp2 += 4;
              obptr += 8;
            }
          for (; x < width; x++)
            {
              g = *bp2++;
              ((uint16 *)obptr)[0] = ((g & 0xf8) << 8) |
                ((g & 0xfc) << 3) |
                (g >> 3);
              obptr += 2;
            }
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#else
static void
xxlib_rgb_convert_565_gray (XlibRgbHandle *handle, XImage *image,
                          int ax, int ay, int width, int height,
                          unsigned char *buf, int rowstride,
                          int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char g;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          g = *bp2++;
          ((uint16 *)obuf)[x] = ((g & 0xf8) << 8) |
            ((g & 0xfc) << 3) |
            (g >> 3);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#endif

static void
xxlib_rgb_convert_565_br (XlibRgbHandle *handle, XImage *image,
                         int ax, int ay, int width, int height,
                         unsigned char *buf, int rowstride,
                         int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          /* final word is:
             g4 g3 g2 b7 b6 b5 b4 b3  r7 r6 r5 r4 r3 g7 g6 g5
           */
          ((unsigned short *)obuf)[x] = (r & 0xf8) |
            ((g & 0xe0) >> 5) |
            ((g & 0x1c) << 11) |
            ((b & 0xf8) << 5);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

/* Thanks to Ray Lehtiniemi for a patch that resulted in a ~25% speedup
   in this mode. */
#ifdef HAIRY_CONVERT_565
static void
xxlib_rgb_convert_565_d (XlibRgbHandle *handle, XImage *image,
                     int ax, int ay, int width, int height,
                     unsigned char *buf, int rowstride,
                     int x_align, int y_align, XlibRgbCmap *cmap)
{
  /* Now this is what I'd call some highly tuned code! */
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;

  width += x_align;
  height += y_align;
  
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = y_align; y < height; y++)
    {
      uint32 *dmp = handle->DM_565 + ((y & (DM_HEIGHT - 1)) << DM_WIDTH_SHIFT);
      bp2 = bptr;
      obptr = obuf;
      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
        {
          for (x = x_align; x < width; x++)
            {
              int32 rgb = *bp2++ << 20;
              rgb += *bp2++ << 10;
              rgb += *bp2++;
              rgb += dmp[x & (DM_WIDTH - 1)];
              rgb += 0x10040100
                - ((rgb & 0x1e0001e0) >> 5)
                - ((rgb & 0x00070000) >> 6);

              ((unsigned short *)obptr)[0] =
                ((rgb & 0x0f800000) >> 12) |
                ((rgb & 0x0003f000) >> 7) |
                ((rgb & 0x000000f8) >> 3);
              obptr += 2;
            }
        }
      else
        {
          for (x = x_align; x < width - 3; x += 4)
            {
              uint32 r1b0g0r0;
              uint32 g2r2b1g1;
              uint32 b3g3r3b2;
              uint32 rgb02, rgb13;

              r1b0g0r0 = ((uint32 *)bp2)[0];
              g2r2b1g1 = ((uint32 *)bp2)[1];
              b3g3r3b2 = ((uint32 *)bp2)[2];
              rgb02 =
                ((r1b0g0r0 & 0xff) << 20) +
                ((r1b0g0r0 & 0xff00) << 2) +
                ((r1b0g0r0 & 0xff0000) >> 16) +
                dmp[x & (DM_WIDTH - 1)];
              rgb02 += 0x10040100
                - ((rgb02 & 0x1e0001e0) >> 5)
                - ((rgb02 & 0x00070000) >> 6);
              rgb13 =
                ((r1b0g0r0 & 0xff000000) >> 4) +
                ((g2r2b1g1 & 0xff) << 10) +
                ((g2r2b1g1 & 0xff00) >> 8) +
                dmp[(x + 1) & (DM_WIDTH - 1)];
              rgb13 += 0x10040100
                - ((rgb13 & 0x1e0001e0) >> 5)
                - ((rgb13 & 0x00070000) >> 6);
              ((uint32 *)obptr)[0] =
                ((rgb02 & 0x0f800000) >> 12) |
                ((rgb02 & 0x0003f000) >> 7) |
                ((rgb02 & 0x000000f8) >> 3) |
                ((rgb13 & 0x0f800000) << 4) |
                ((rgb13 & 0x0003f000) << 9) |
                ((rgb13 & 0x000000f8) << 13);
              rgb02 =
                ((g2r2b1g1 & 0xff0000) << 4) +
                ((g2r2b1g1 & 0xff000000) >> 14) +
                (b3g3r3b2 & 0xff) +
                dmp[(x + 2) & (DM_WIDTH - 1)];
              rgb02 += 0x10040100
                - ((rgb02 & 0x1e0001e0) >> 5)
                - ((rgb02 & 0x00070000) >> 6);
              rgb13 =
                ((b3g3r3b2 & 0xff00) << 12) +
                ((b3g3r3b2 & 0xff0000) >> 6) +
                ((b3g3r3b2 & 0xff000000) >> 24) +
                dmp[(x + 3) & (DM_WIDTH - 1)];
              rgb13 += 0x10040100
                - ((rgb13 & 0x1e0001e0) >> 5)
                - ((rgb13 & 0x00070000) >> 6);
              ((uint32 *)obptr)[1] =
                ((rgb02 & 0x0f800000) >> 12) |
                ((rgb02 & 0x0003f000) >> 7) |
                ((rgb02 & 0x000000f8) >> 3) |
                ((rgb13 & 0x0f800000) << 4) |
                ((rgb13 & 0x0003f000) << 9) |
                ((rgb13 & 0x000000f8) << 13);
              bp2 += 12;
              obptr += 8;
            }
          for (; x < width; x++)
            {
              int32 rgb = *bp2++ << 20;
              rgb += *bp2++ << 10;
              rgb += *bp2++;
              rgb += dmp[x & (DM_WIDTH - 1)];
              rgb += 0x10040100
                - ((rgb & 0x1e0001e0) >> 5)
                - ((rgb & 0x00070000) >> 6);

              ((unsigned short *)obptr)[0] =
                ((rgb & 0x0f800000) >> 12) |
                ((rgb & 0x0003f000) >> 7) |
                ((rgb & 0x000000f8) >> 3);
              obptr += 2;
            }
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#else
static void
xxlib_rgb_convert_565_d (XlibRgbHandle *handle, XImage *image,
                       int ax, int ay, int width, int height,
                       unsigned char *buf, int rowstride,
                       int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr;

  width += x_align;
  height += y_align;
  
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + (ax - x_align) * 2;

  for (y = y_align; y < height; y++)
    {
      uint32 *dmp = handle->DM_565 + ((y & (DM_HEIGHT - 1)) << DM_WIDTH_SHIFT);
      unsigned char *bp2 = bptr;

      for (x = x_align; x < width; x++)
        {
          int32 rgb = *bp2++ << 20;
          rgb += *bp2++ << 10;
          rgb += *bp2++;
          rgb += dmp[x & (DM_WIDTH - 1)];
          rgb += 0x10040100
            - ((rgb & 0x1e0001e0) >> 5)
            - ((rgb & 0x00070000) >> 6);

          ((unsigned short *)obuf)[x] =
            ((rgb & 0x0f800000) >> 12) |
            ((rgb & 0x0003f000) >> 7) |
            ((rgb & 0x000000f8) >> 3);
        }

      bptr += rowstride;
      obuf += bpl;
    }
}
#endif

static void
xxlib_rgb_convert_555 (XlibRgbHandle *handle, XImage *image,
                     int ax, int ay, int width, int height,
                     unsigned char *buf, int rowstride,
                     int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          ((unsigned short *)obuf)[x] = ((r & 0xf8) << 7) |
            ((g & 0xf8) << 2) |
            (b >> 3);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_555_br (XlibRgbHandle *handle, XImage *image,
                        int ax, int ay, int width, int height,
                        unsigned char *buf, int rowstride,
                        int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  unsigned char r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 2;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          /* final word is:
             g5 g4 g3 b7 b6 b5 b4 b3  0 r7 r6 r5 r4 r3 g7 g6
           */
          ((unsigned short *)obuf)[x] = ((r & 0xf8) >> 1) |
            ((g & 0xc0) >> 6) |
            ((g & 0x18) << 10) |
            ((b & 0xf8) << 5);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_888_msb (XlibRgbHandle *handle, XImage *image,
                         int ax, int ay, int width, int height,
                         unsigned char *buf, int rowstride,
                         int x_align, int y_align, XlibRgbCmap *cmap)
{
  int y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 3;
  for (y = 0; y < height; y++)
    {
      memcpy (obuf, bptr, (unsigned int)(width + width + width));
      bptr += rowstride;
      obuf += bpl;
    }
}

/* todo: optimize this */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define HAIRY_CONVERT_888
#endif

#ifdef HAIRY_CONVERT_888
static void
xxlib_rgb_convert_888_lsb (XlibRgbHandle *handle, XImage *image,
                          int ax, int ay, int width, int height,
                          unsigned char *buf, int rowstride,
                          int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 3;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      if (((unsigned long)obuf | (unsigned long) bp2) & 3)
        {
          for (x = 0; x < width; x++)
            {
              r = bp2[0];
              g = bp2[1];
              b = bp2[2];
              *obptr++ = b;
              *obptr++ = g;
              *obptr++ = r;
              bp2 += 3;
            }
        }
      else
        {
          for (x = 0; x < width - 3; x += 4)
            {
              uint32 r1b0g0r0;
              uint32 g2r2b1g1;
              uint32 b3g3r3b2;

              r1b0g0r0 = ((uint32 *)bp2)[0];
              g2r2b1g1 = ((uint32 *)bp2)[1];
              b3g3r3b2 = ((uint32 *)bp2)[2];
              ((uint32 *)obptr)[0] =
                (r1b0g0r0 & 0xff00) |
                ((r1b0g0r0 & 0xff0000) >> 16) |
                (((g2r2b1g1 & 0xff00) | (r1b0g0r0 & 0xff)) << 16);
              ((uint32 *)obptr)[1] =
                (g2r2b1g1 & 0xff0000ff) |
                ((r1b0g0r0 & 0xff000000) >> 16) |
                ((b3g3r3b2 & 0xff) << 16);
              ((uint32 *)obptr)[2] =
                (((g2r2b1g1 & 0xff0000) | (b3g3r3b2 & 0xff000000)) >> 16) |
                ((b3g3r3b2 & 0xff00) << 16) |
                ((b3g3r3b2 & 0xff0000));
              bp2 += 12;
              obptr += 12;
            }
          for (; x < width; x++)
            {
              r = bp2[0];
              g = bp2[1];
              b = bp2[2];
              *obptr++ = b;
              *obptr++ = g;
              *obptr++ = r;
              bp2 += 3;
            }
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#else
static void
xxlib_rgb_convert_888_lsb (XlibRgbHandle *handle, XImage *image,
                         int ax, int ay, int width, int height,
                         unsigned char *buf, int rowstride,
                         int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 3;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          obuf[x * 3] = b;
          obuf[x * 3 + 1] = g;
          obuf[x * 3 + 2] = r;
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}
#endif

/* convert 24-bit packed to 32-bit unpacked */
/* todo: optimize this */
static void
xxlib_rgb_convert_0888 (XlibRgbHandle *handle, XImage *image,
                      int ax, int ay, int width, int height,
                      unsigned char *buf, int rowstride,
                      int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 4;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          ((uint32 *)obuf)[x] = (r << 16) | (g << 8) | b;
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_0888_br (XlibRgbHandle *handle, XImage *image,
                         int ax, int ay, int width, int height,
                         unsigned char *buf, int rowstride,
                         int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 4;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          ((uint32 *)obuf)[x] = (b << 24) | (g << 16) | (r << 8);
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_8880_br (XlibRgbHandle *handle, XImage *image,
                         int ax, int ay, int width, int height,
                         unsigned char *buf, int rowstride,
                         int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * 4;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          ((uint32 *)obuf)[x] = (b << 16) | (g << 8) | r;
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

/* Generic truecolor/directcolor conversion function. Slow, but these
   are oddball modes. */
static void
xxlib_rgb_convert_truecolor_lsb (XlibRgbHandle *handle, XImage *image,
                               int ax, int ay, int width, int height,
                               unsigned char *buf, int rowstride,
                               int x_align, int y_align,
                               XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;
  int r_right, r_left;
  int g_right, g_left;
  int b_right, b_left;
  int bpp;
  uint32 pixel;
  int i;

  r_right = 8 - handle->red_prec;
  r_left = handle->red_shift;
  g_right = 8 - handle->green_prec;
  g_left = handle->green_shift;
  b_right = 8 - handle->blue_prec;
  b_left = handle->blue_shift;
  bpp = handle->bpp;
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * bpp;
  for (y = 0; y < height; y++)
    {
      obptr = obuf;
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          pixel = ((r >> r_right) << r_left) |
            ((g >> g_right) << g_left) |
            ((b >> b_right) << b_left);
          for (i = 0; i < bpp; i++)
            {
              *obptr++ = pixel & 0xff;
              pixel >>= 8;
            }
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_truecolor_lsb_d (XlibRgbHandle *handle, XImage *image,
                                 int ax, int ay, int width, int height,
                                 unsigned char *buf, int rowstride,
                                 int x_align, int y_align,
                                 XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;
  int r_right, r_left, r_prec;
  int g_right, g_left, g_prec;
  int b_right, b_left, b_prec;
  int bpp;
  uint32 pixel;
  int i;
  int dith;
  int r1, g1, b1;
  const unsigned char *dmp;

  r_right = 8 - handle->red_prec;
  r_left = handle->red_shift;
  r_prec = handle->red_prec;
  g_right = 8 - handle->green_prec;
  g_left = handle->green_shift;
  g_prec = handle->green_prec;
  b_right = 8 - handle->blue_prec;
  b_left = handle->blue_shift;
  b_prec = handle->blue_prec;
  bpp = handle->bpp;
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * bpp;
  for (y = 0; y < height; y++)
    {
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      obptr = obuf;
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          dith = dmp[(x_align + x) & (DM_WIDTH - 1)] << 2;
          r1 = r + (dith >> r_prec);
          g1 = g + ((252 - dith) >> g_prec);
          b1 = b + (dith >> b_prec);
          pixel = (((r1 - (r1 >> r_prec)) >> r_right) << r_left) |
            (((g1 - (g1 >> g_prec)) >> g_right) << g_left) |
            (((b1 - (b1 >> b_prec)) >> b_right) << b_left);
          for (i = 0; i < bpp; i++)
            {
              *obptr++ = pixel & 0xff;
              pixel >>= 8;
            }
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_truecolor_msb (XlibRgbHandle *handle, XImage *image,
                               int ax, int ay, int width, int height,
                               unsigned char *buf, int rowstride,
                               int x_align, int y_align,
                               XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;
  int r_right, r_left;
  int g_right, g_left;
  int b_right, b_left;
  int bpp;
  uint32 pixel;
  int shift, shift_init;

  r_right = 8 - handle->red_prec;
  r_left = handle->red_shift;
  g_right = 8 - handle->green_prec;
  g_left = handle->green_shift;
  b_right = 8 - handle->blue_prec;
  b_left = handle->blue_shift;
  bpp = handle->bpp;
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * bpp;
  shift_init = (bpp - 1) << 3;
  for (y = 0; y < height; y++)
    {
      obptr = obuf;
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          pixel = ((r >> r_right) << r_left) |
            ((g >> g_right) << g_left) |
            ((b >> b_right) << b_left);
          for (shift = shift_init; shift >= 0; shift -= 8)
            {
              *obptr++ = (pixel >> shift) & 0xff;
            }
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_truecolor_msb_d (XlibRgbHandle *handle, XImage *image,
                                 int ax, int ay, int width, int height,
                                 unsigned char *buf, int rowstride,
                                 int x_align, int y_align,
                                 XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *obuf, *obptr;
  int bpl;
  unsigned char *bptr, *bp2;
  int r, g, b;
  int r_right, r_left, r_prec;
  int g_right, g_left, g_prec;
  int b_right, b_left, b_prec;
  int bpp;
  uint32 pixel;
  int shift, shift_init;
  int dith;
  int r1, g1, b1;
  const unsigned char *dmp;

  r_right = 8 - handle->red_prec;
  r_left = handle->red_shift;
  r_prec = handle->red_prec;
  g_right = 8 - handle->green_prec;
  g_left = handle->green_shift;
  g_prec = handle->green_prec;
  b_right = 8 - handle->blue_prec;
  b_left = handle->blue_shift;
  b_prec = handle->blue_prec;
  bpp = handle->bpp;
  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax * bpp;
  shift_init = (bpp - 1) << 3;
  for (y = 0; y < height; y++)
    {
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      obptr = obuf;
      bp2 = bptr;
      for (x = 0; x < width; x++)
        {
          r = bp2[0];
          g = bp2[1];
          b = bp2[2];
          dith = dmp[(x_align + x) & (DM_WIDTH - 1)] << 2;
          r1 = r + (dith >> r_prec);
          g1 = g + ((252 - dith) >> g_prec);
          b1 = b + (dith >> b_prec);
          pixel = (((r1 - (r1 >> r_prec)) >> r_right) << r_left) |
            (((g1 - (g1 >> g_prec)) >> g_right) << g_left) |
            (((b1 - (b1 >> b_prec)) >> b_right) << b_left);
          for (shift = shift_init; shift >= 0; shift -= 8)
            {
              *obptr++ = (pixel >> shift) & 0xff;
            }
          bp2 += 3;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

/* This actually works for depths from 3 to 7 */
static void
xxlib_rgb_convert_4 (XlibRgbHandle *handle, XImage *image,
                   int ax, int ay, int width, int height,
                   unsigned char *buf, int rowstride,
                   int x_align, int y_align,
                   XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  const unsigned char *dmp;
  int dith;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  for (y = 0; y < height; y++)
    {
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x += 1)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) | 3;
          obptr[0] = handle->colorcube_d[(((r + dith) & 0x100) >> 2) |
                                (((g + 258 - dith) & 0x100) >> 5) |
                                (((b + dith) & 0x100) >> 8)];
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

/* This actually works for depths from 3 to 7 */
static void
xxlib_rgb_convert_gray4 (XlibRgbHandle *handle, XImage *image,
                       int ax, int ay, int width, int height,
                       unsigned char *buf, int rowstride,
                       int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  int shift;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  shift = 9 - handle->x_visual_info->depth;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          obptr[0] = (g + ((b + r) >> 1)) >> shift;
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_gray4_pack (XlibRgbHandle *handle, XImage *image,
                            int ax, int ay, int width, int height,
                            unsigned char *buf, int rowstride,
                            int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  int shift;
  unsigned char pix0, pix1;
  /* todo: this is hardcoded to big-endian. Make endian-agile. */

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + (ax >> 1);
  shift = 9 - handle->x_visual_info->depth;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x += 2)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          pix0 = (g + ((b + r) >> 1)) >> shift;
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          pix1 = (g + ((b + r) >> 1)) >> shift;
          obptr[0] = (pix0 << 4) | pix1;
          obptr++;
        }
      if (width & 1)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          pix0 = (g + ((b + r) >> 1)) >> shift;
          obptr[0] = (pix0 << 4);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

/* This actually works for depths from 3 to 7 */
static void
xxlib_rgb_convert_gray4_d (XlibRgbHandle *handle, XImage *image,
                       int ax, int ay, int width, int height,
                       unsigned char *buf, int rowstride,
                       int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  const unsigned char *dmp;
  int prec, right;
  int gray;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + ax;
  prec = handle->x_visual_info->depth;
  right = 8 - prec;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          gray = (g + ((b + r) >> 1)) >> 1;
          gray += (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) >> prec;
          obptr[0] = (gray - (gray >> prec)) >> right;
          obptr++;
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_gray4_d_pack (XlibRgbHandle *handle, XImage *image,
                              int ax, int ay, int width, int height,
                              unsigned char *buf, int rowstride,
                              int x_align, int y_align, XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  const unsigned char *dmp;
  int prec, right;
  int gray;
  unsigned char pix0, pix1;
  /* todo: this is hardcoded to big-endian. Make endian-agile. */

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + (ax >> 1);
  prec = handle->x_visual_info->depth;
  right = 8 - prec;
  for (y = 0; y < height; y++)
    {
      bp2 = bptr;
      obptr = obuf;
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      for (x = 0; x < width; x += 2)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          gray = (g + ((b + r) >> 1)) >> 1;
          gray += (dmp[(x_align + x) & (DM_WIDTH - 1)] << 2) >> prec;
          pix0 = (gray - (gray >> prec)) >> right;
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          gray = (g + ((b + r) >> 1)) >> 1;
          gray += (dmp[(x_align + x + 1) & (DM_WIDTH - 1)] << 2) >> prec;
          pix1 = (gray - (gray >> prec)) >> right;
          obptr[0] = (pix0 << 4) | pix1;
          obptr++;
        }
      if (width & 1)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          gray = (g + ((b + r) >> 1)) >> 1;
          gray += (dmp[(x_align + x + 1) & (DM_WIDTH - 1)] << 2) >> prec;
          pix0 = (gray - (gray >> prec)) >> right;
          obptr[0] = (pix0 << 4);
        }
      bptr += rowstride;
      obuf += bpl;
    }
}

static void
xxlib_rgb_convert_1 (XlibRgbHandle *handle, XImage *image,
                   int ax, int ay, int width, int height,
                   unsigned char *buf, int rowstride,
                   int x_align, int y_align,
                   XlibRgbCmap *cmap)
{
  int x, y;
  int bpl;
  unsigned char *obuf, *obptr;
  unsigned char *bptr, *bp2;
  int r, g, b;
  const unsigned char *dmp;
  int dith;
  unsigned char byte;

  bptr = buf;
  bpl = image->bytes_per_line;
  obuf = ((unsigned char *)image->data) + ay * bpl + (ax >> 3);
  byte = 0; /* unnecessary, but it keeps gcc from complaining */
  for (y = 0; y < height; y++)
    {
      dmp = DM[(y_align + y) & (DM_HEIGHT - 1)];
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++)
        {
          r = *bp2++;
          g = *bp2++;
          b = *bp2++;
          dith = (dmp[(x_align + x) & (DM_WIDTH - 1)] << 4) | 4;
          byte += byte + (r + g + g + b + dith > 1020);
          if ((x & 7) == 7)
            {
              obptr[0] = byte;
              obptr++;
            }
        }
      if (x & 7)
        obptr[0] = byte << (8 - (x & 7));
      bptr += rowstride;
      obuf += bpl;
    }
}

/* Returns a pointer to the stage buffer. */
static unsigned char *
xxlib_rgb_ensure_stage (XlibRgbHandle *handle)
{
  if (handle->stage_buf == NULL)
    handle->stage_buf = malloc (IMAGE_HEIGHT * STAGE_ROWSTRIDE);
  return handle->stage_buf;
}

/* This is slow. Speed me up, please. */
static void
xxlib_rgb_32_to_stage (XlibRgbHandle *handle, unsigned char *buf, int rowstride, int width, int height)
{
  int x, y;
  unsigned char *pi_start, *po_start;
  unsigned char *pi, *po;

  pi_start = buf;
  po_start = xxlib_rgb_ensure_stage (handle);
  for (y = 0; y < height; y++)
    {
      pi = pi_start;
      po = po_start;
      for (x = 0; x < width; x++)
        {
          *po++ = *pi++;
          *po++ = *pi++;
          *po++ = *pi++;
          pi++;
        }
      pi_start += rowstride;
      po_start += STAGE_ROWSTRIDE;
    }
}

/* Generic 32bit RGB conversion function - convert to 24bit packed, then
   go from there. */
static void
xxlib_rgb_convert_32_generic (XlibRgbHandle *handle, XImage *image,
                            int ax, int ay, int width, int height,
                            unsigned char *buf, int rowstride,
                            int x_align, int y_align, XlibRgbCmap *cmap)
{
  xxlib_rgb_32_to_stage (handle, buf, rowstride, width, height);

  (*handle->conv) (handle, image, ax, ay, width, height,
                       handle->stage_buf, STAGE_ROWSTRIDE,
                       x_align, y_align, cmap);
}

/* Generic 32bit RGB conversion function - convert to 24bit packed, then
   go from there. */
static void
xxlib_rgb_convert_32_generic_d (XlibRgbHandle *handle, XImage *image,
                              int ax, int ay, int width, int height,
                              unsigned char *buf, int rowstride,
                              int x_align, int y_align, XlibRgbCmap *cmap)
{
  xxlib_rgb_32_to_stage (handle, buf, rowstride, width, height);

  (*handle->conv_d) (handle, image, ax, ay, width, height,
                         handle->stage_buf, STAGE_ROWSTRIDE,
                         x_align, y_align, cmap);
}

/* This is slow. Speed me up, please. */
static void
xxlib_rgb_gray_to_stage (XlibRgbHandle *handle, unsigned char *buf, int rowstride, int width, int height)
{
  int x, y;
  unsigned char *pi_start, *po_start;
  unsigned char *pi, *po;
  unsigned char gray;

  pi_start = buf;
  po_start = xxlib_rgb_ensure_stage (handle);
  for (y = 0; y < height; y++)
    {
      pi = pi_start;
      po = po_start;
      for (x = 0; x < width; x++)
        {
          gray = *pi++;
          *po++ = gray;
          *po++ = gray;
          *po++ = gray;
        }
      pi_start += rowstride;
      po_start += STAGE_ROWSTRIDE;
    }
}

/* Generic gray conversion function - convert to 24bit packed, then go
   from there. */
static void
xxlib_rgb_convert_gray_generic (XlibRgbHandle *handle, XImage *image,
                              int ax, int ay, int width, int height,
                              unsigned char *buf, int rowstride,
                              int x_align, int y_align, XlibRgbCmap *cmap)
{
  xxlib_rgb_gray_to_stage (handle, buf, rowstride, width, height);

  (*handle->conv) (handle, image, ax, ay, width, height,
                       handle->stage_buf, STAGE_ROWSTRIDE,
                       x_align, y_align, cmap);
}

static void
xxlib_rgb_convert_gray_generic_d (XlibRgbHandle *handle, XImage *image,
                                int ax, int ay, int width, int height,
                                unsigned char *buf, int rowstride,
                                int x_align, int y_align, XlibRgbCmap *cmap)
{
  xxlib_rgb_gray_to_stage (handle, buf, rowstride, width, height);

  (*handle->conv_d) (handle, image, ax, ay, width, height,
                         handle->stage_buf, STAGE_ROWSTRIDE,
                         x_align, y_align, cmap);
}

/* Render grayscale using indexed method. */
static void
xxlib_rgb_convert_gray_cmap (XlibRgbHandle *handle, XImage *image,
                           int ax, int ay, int width, int height,
                           unsigned char *buf, int rowstride,
                           int x_align, int y_align, XlibRgbCmap *cmap)
{
  (*handle->conv_indexed) (handle, image, ax, ay, width, height,
                               buf, rowstride,
                               x_align, y_align, handle->gray_cmap);
}

#if 0
static void
xxlib_rgb_convert_gray_cmap_d (XlibRgbHandle *handle, XImage *image,
                                int ax, int ay, int width, int height,
                                unsigned char *buf, int rowstride,
                                int x_align, int y_align, XlibRgbCmap *cmap)
{
  (*handle->conv_indexed_d) (handle, image, ax, ay, width, height,
                                 buf, rowstride,
                                 x_align, y_align, handle->gray_cmap);
}
#endif

/* This is slow. Speed me up, please. */
static void
xxlib_rgb_indexed_to_stage (XlibRgbHandle *handle, unsigned char *buf, int rowstride, int width, int height,
                          XlibRgbCmap *cmap)
{
  int x, y;
  unsigned char *pi_start, *po_start;
  unsigned char *pi, *po;
  int rgb;

  pi_start = buf;
  po_start = xxlib_rgb_ensure_stage (handle);
  for (y = 0; y < height; y++)
    {
      pi = pi_start;
      po = po_start;
      for (x = 0; x < width; x++)
        {
          rgb = cmap->colors[*pi++];
          *po++ = rgb >> 16;
          *po++ = (rgb >> 8) & 0xff;
          *po++ = rgb & 0xff;
        }
      pi_start += rowstride;
      po_start += STAGE_ROWSTRIDE;
    }
}

/* Generic gray conversion function - convert to 24bit packed, then go
   from there. */
static void
xxlib_rgb_convert_indexed_generic (XlibRgbHandle *handle, XImage *image,
                                 int ax, int ay, int width, int height,
                                 unsigned char *buf, int rowstride,
                                 int x_align, int y_align, XlibRgbCmap *cmap)
{
  xxlib_rgb_indexed_to_stage (handle, buf, rowstride, width, height, cmap);

  (*handle->conv) (handle, image, ax, ay, width, height,
                       handle->stage_buf, STAGE_ROWSTRIDE,
                       x_align, y_align, cmap);
}

static void
xxlib_rgb_convert_indexed_generic_d (XlibRgbHandle *handle, XImage *image,
                                   int ax, int ay, int width, int height,
                                   unsigned char *buf, int rowstride,
                                   int x_align, int y_align,
                                   XlibRgbCmap *cmap)
{
  xxlib_rgb_indexed_to_stage (handle, buf, rowstride, width, height, cmap);

  (*handle->conv_d) (handle, image, ax, ay, width, height,
                         handle->stage_buf, STAGE_ROWSTRIDE,
                         x_align, y_align, cmap);
}

/* Select a conversion function based on the visual and a
   representative image. */
static void
xxlib_rgb_select_conv (XlibRgbHandle *handle, XImage *image, ByteOrder byte_order)
{
  int depth, byterev;
  int vtype; /* visual type */
  int bpp; /* bits per pixel - from the visual */
  uint32 red_mask, green_mask, blue_mask;
  XlibRgbConvFunc conv, conv_d;
  XlibRgbConvFunc conv_32, conv_32_d;
  XlibRgbConvFunc conv_gray, conv_gray_d;
  XlibRgbConvFunc conv_indexed, conv_indexed_d;
  Bool mask_rgb, mask_bgr;

  depth = handle->x_visual_info->depth;
  bpp = image->bits_per_pixel;
  if (handle->xlib_rgb_verbose)
    printf ("Chose visual 0x%x, image bpp=%d, %s first\n",
            (int)handle->x_visual_info->visual->visualid,
            bpp, byte_order == LSB_FIRST ? "lsb" : "msb");

#if G_BYTE_ORDER == G_BIG_ENDIAN
  byterev = (byte_order == LSB_FIRST);
#else
  byterev = (byte_order == MSB_FIRST);
#endif

  vtype = handle->x_visual_info->class;
  if (vtype == DirectColor)
    vtype = TrueColor;

  red_mask = handle->x_visual_info->red_mask;
  green_mask = handle->x_visual_info->green_mask;
  blue_mask = handle->x_visual_info->blue_mask;

  mask_rgb = red_mask == 0xff0000 && green_mask == 0xff00 && blue_mask == 0xff;
  mask_bgr = red_mask == 0xff && green_mask == 0xff00 && blue_mask == 0xff0000;

  conv   = NULL;
  conv_d = NULL;

  conv_32     = xxlib_rgb_convert_32_generic;
  conv_32_d   = xxlib_rgb_convert_32_generic_d;

  conv_gray   = xxlib_rgb_convert_gray_generic;
  conv_gray_d = xxlib_rgb_convert_gray_generic_d;

  conv_indexed   = xxlib_rgb_convert_indexed_generic;
  conv_indexed_d = xxlib_rgb_convert_indexed_generic_d;

  handle->dith_default = FALSE;

  if (handle->bitmap)
    conv = xxlib_rgb_convert_1;
  else if (bpp == 16 && depth == 16 && !byterev &&
      red_mask == 0xf800 && green_mask == 0x7e0 && blue_mask == 0x1f)
    {
      conv = xxlib_rgb_convert_565;
      conv_d = xxlib_rgb_convert_565_d;
      conv_gray = xxlib_rgb_convert_565_gray;
      xxlib_rgb_preprocess_dm_565 (handle);
    }
  else if (bpp == 16 && depth == 16 &&
           vtype == TrueColor&& byterev &&
      red_mask == 0xf800 && green_mask == 0x7e0 && blue_mask == 0x1f)
    conv = xxlib_rgb_convert_565_br;

  else if (bpp == 16 && depth == 15 &&
           vtype == TrueColor && !byterev &&
      red_mask == 0x7c00 && green_mask == 0x3e0 && blue_mask == 0x1f)
    conv = xxlib_rgb_convert_555;

  else if (bpp == 16 && depth == 15 &&
           vtype == TrueColor && byterev &&
      red_mask == 0x7c00 && green_mask == 0x3e0 && blue_mask == 0x1f)
    conv = xxlib_rgb_convert_555_br;

  /* I'm not 100% sure about the 24bpp tests - but testing will show*/
  else if (bpp == 24 && depth == 24 && vtype == TrueColor &&
           ((mask_rgb && byte_order == LSB_FIRST) ||
            (mask_bgr && byte_order == MSB_FIRST)))
    conv = xxlib_rgb_convert_888_lsb;
  else if (bpp == 24 && depth == 24 && vtype == TrueColor &&
           ((mask_rgb && byte_order == MSB_FIRST) ||
            (mask_bgr && byte_order == LSB_FIRST)))
    conv = xxlib_rgb_convert_888_msb;
#if G_BYTE_ORDER == G_BIG_ENDIAN
  else if (bpp == 32 && depth == 24 && vtype == TrueColor &&
           (mask_rgb && byte_order == LSB_FIRST))
    conv = xxlib_rgb_convert_0888_br;
  else if (bpp == 32 && depth == 24 && vtype == TrueColor &&
           (mask_rgb && byte_order == MSB_FIRST))
    conv = xxlib_rgb_convert_0888;
  else if (bpp == 32 && depth == 24 && vtype == TrueColor &&
           (mask_bgr && byte_order == MSB_FIRST))
    conv = xxlib_rgb_convert_8880_br;
#else
  else if (bpp == 32 && depth == 24 && vtype == TrueColor &&
           (mask_rgb && byte_order == MSB_FIRST))
    conv = xxlib_rgb_convert_0888_br;
  else if (bpp == 32 && (depth == 32 || depth == 24) && vtype == TrueColor &&
           (mask_rgb && byte_order == LSB_FIRST))
    conv = xxlib_rgb_convert_0888;
  else if (bpp == 32 && depth == 24 && vtype == TrueColor &&
           (mask_bgr && byte_order == LSB_FIRST))
    conv = xxlib_rgb_convert_8880_br;
#endif

  else if (vtype == TrueColor && byte_order == LSB_FIRST)
    {
      conv = xxlib_rgb_convert_truecolor_lsb;
      conv_d = xxlib_rgb_convert_truecolor_lsb_d;
    }
  else if (vtype == TrueColor && byte_order == MSB_FIRST)
    {
      conv = xxlib_rgb_convert_truecolor_msb;
      conv_d = xxlib_rgb_convert_truecolor_msb_d;
    }
  else if (bpp == 8 && depth == 8 && (vtype == PseudoColor || vtype == StaticColor
#ifdef ENABLE_GRAYSCALE
                                      || vtype == GrayScale
#endif
                                      ))
    {
      handle->dith_default = TRUE;
      conv = xxlib_rgb_convert_8;
      if (vtype != GrayScale)
        {
          if (handle->nred_shades == 6 &&
              handle->ngreen_shades == 6 &&
              handle->nblue_shades == 6)
            conv_d = xxlib_rgb_convert_8_d666;
          else
            conv_d = xxlib_rgb_convert_8_d;
        }
      conv_indexed = xxlib_rgb_convert_8_indexed;
      conv_gray = xxlib_rgb_convert_gray_cmap;
    }
  else if (bpp == 8 && depth == 8 && (vtype == StaticGray
#ifdef not_ENABLE_GRAYSCALE
                                      || vtype == GrayScale
#endif
                                      ))
    {
      conv = xxlib_rgb_convert_gray8;
      conv_gray = xxlib_rgb_convert_gray8_gray;
    }
  else if (bpp == 8 && depth < 8 && depth >= 2 &&
           (vtype == StaticGray
            || vtype == GrayScale))
    {
      conv = xxlib_rgb_convert_gray4;
      conv_d = xxlib_rgb_convert_gray4_d;
    }
  else if (bpp == 8 && depth < 8 && depth >= 3)
    {
      conv = xxlib_rgb_convert_4;
    }
  else if (bpp == 4 && depth <= 4 && depth >= 2 &&
           (vtype == StaticGray
            || vtype == GrayScale))
    {
      conv = xxlib_rgb_convert_gray4_pack;
      conv_d = xxlib_rgb_convert_gray4_d_pack;
    }

  if (conv_d == NULL)
    conv_d = conv;

  handle->conv = conv;
  handle->conv_d = conv_d;

  handle->conv_32 = conv_32;
  handle->conv_32_d = conv_32_d;

  handle->conv_gray = conv_gray;
  handle->conv_gray_d = conv_gray_d;

  handle->conv_indexed = conv_indexed;
  handle->conv_indexed_d = conv_indexed_d;
}

static int
xxlib_rgb_alloc_scratch_image (XlibRgbHandle *handle)
{
  if (handle->static_image_idx == N_IMAGES)
  {
#ifdef XLIBRGB_ENABLE_MITSHM_SUPPORT
    if (handle->xlib_use_shm)
      XFlush(handle->display);
#endif /* XLIBRGB_ENABLE_MITSHM_SUPPORT */
      
    handle->static_image_idx = 0;
    handle->horiz_y = IMAGE_HEIGHT;
    handle->vert_x  = IMAGE_WIDTH;
    handle->tile_x  = IMAGE_WIDTH;
    handle->tile_y1 = handle->tile_y2 = IMAGE_HEIGHT;
  }
  
  return handle->static_image_idx++;
}

static XImage *
xxlib_rgb_alloc_scratch (XlibRgbHandle *handle, int width, int height, int *ax, int *ay)
{
  XImage *image;
  int idx;

  if (width >= (IMAGE_WIDTH >> 1))
  {
    if (height >= (IMAGE_HEIGHT >> 1))
    {
      idx = xxlib_rgb_alloc_scratch_image (handle);
      *ax = 0;
      *ay = 0;
    }
    else
    {
      if (height + handle->horiz_y > IMAGE_HEIGHT)
      {
        handle->horiz_idx = xxlib_rgb_alloc_scratch_image (handle);
        handle->horiz_y = 0;
      }
      idx = handle->horiz_idx;
      *ax = 0;
      *ay = handle->horiz_y;
      handle->horiz_y += height;
    }
  }
  else
  {
    if (height >= (IMAGE_HEIGHT >> 1))
    {
      if (width + handle->vert_x > IMAGE_WIDTH)
      {
        handle->vert_idx = xxlib_rgb_alloc_scratch_image (handle);
        handle->vert_x = 0;
      }
      idx = handle->vert_idx;
      *ax = handle->vert_x;
      *ay = 0;
      /* using 3 and -4 would be slightly more efficient on 32-bit machines
         with > 1bpp displays */
      handle->vert_x += (width + 7) & -8;
    }
    else
    {
      if (width + handle->tile_x > IMAGE_WIDTH)
      {
        handle->tile_y1 = handle->tile_y2;
        handle->tile_x = 0;
      }
      if (height + handle->tile_y1 > IMAGE_HEIGHT)
      {
        handle->tile_idx = xxlib_rgb_alloc_scratch_image (handle);
        handle->tile_x = 0;
        handle->tile_y1 = 0;
        handle->tile_y2 = 0;
      }
      if (height + handle->tile_y1 > handle->tile_y2)
        handle->tile_y2 = height + handle->tile_y1;
      idx = handle->tile_idx;
      *ax = handle->tile_x;
      *ay = handle->tile_y1;
      handle->tile_x += (width + 7) & -8;
    }
  }
  image = handle->static_image[idx];

  return image;
}


static int 
xxlib_get_bits_per_pixel (XlibRgbHandle *handle, int depth)
{
  if (depth <= 4)
      return 4;
  if (depth <= 8)
      return 8;
  if (depth <= 16)
      return 16;
  return 32;
}

/* Use optimized code... */   
#define XLIB_USE_FAST_BUT_UGLY_CODE 1

/* size of static buffer to store images in non-tiling mode
 * (see xlib_disallow_image_tiling()). If this buffer is too small to store
 * the whole image into it a new buffer is allocated for that image 
 */
#define XLIB_STATIC_IMAGE_BUFFER_SIZE (256 * 128 * (32/4))   

static void
xxlib_draw_rgb_image_core (XlibRgbHandle *handle, 
                           Drawable drawable,
                           GC gc,
                           int x,
                           int y,
                           int width,
                           int height,
                           unsigned char *buf,
                           int pixstride,
                           int rowstride,
                           XlibRgbConvFunc conv,
                           XlibRgbCmap *cmap,
                           int xdith,
                           int ydith)
{
  Bool do_tile;
  
  if (handle->bitmap)
  {
    if (handle->own_gc == None)
    {
      XColor color;

      handle->own_gc = XCreateGC(handle->display,
                                 drawable,
                                 0, NULL);
      color.pixel = XWhitePixel(handle->display,
                                handle->screen_num);
      XSetForeground(handle->display, handle->own_gc, color.pixel);
      color.pixel = XBlackPixel(handle->display,
                                handle->screen_num);
      XSetBackground(handle->display, handle->own_gc, color.pixel);
    }
    gc = handle->own_gc;
  }

  /* Avoid image tiling for small images (1/32 of the maximum request size -
   * guranteed to be at least 16384 bytes). Tiling buffers are rare - and 
   * in the case of MIT-SHM require a XFlush() if all tile images have been used-up.
   */
  do_tile = ((handle->x_visual_info->depth+7)/8 * width * height) > (handle->max_request_size/32);
      
  if( (!handle->disallow_image_tiling) && do_tile )
  {
    int ay, ax;
    int xs0, ys0;
    int width1, height1;
    unsigned char *buf_ptr;
    XImage *image;
          
    for (ay = 0; ay < height; ay += IMAGE_HEIGHT)
    {
      height1 = MIN (height - ay, IMAGE_HEIGHT);
      for (ax = 0; ax < width; ax += IMAGE_WIDTH)
      {
        width1 = MIN (width - ax, IMAGE_WIDTH);
        buf_ptr = buf + ay * rowstride + ax * pixstride;

        image = xxlib_rgb_alloc_scratch (handle, width1, height1, &xs0, &ys0);

        conv (handle, image, xs0, ys0, width1, height1, buf_ptr, rowstride,
              x + ax + xdith, y + ay + ydith, cmap);

#ifndef DONT_ACTUALLY_DRAW
        xxlib_image_put(handle, drawable, gc, image,
                       xs0, ys0, x + ax, y + ay,
                       (unsigned int)width1, (unsigned int)height1);
#endif /* !DONT_ACTUALLY_DRAW */
      }
    }
  }
  else
#ifdef XLIB_USE_FAST_BUT_UGLY_CODE
  /* This is a heavily optimized version of the implementation used when  
   * XLIB_USE_FAST_BUT_UGLY_CODE is not set. It tries to avoid malloc()/XCreateImage() 
   * by using a static buffer if possible - but uses malloc() when the image data are 
   * too large to fit info that buffer...
   */
  {    
    XImage ximage;
    int    format;
    int    depth;
    int    xpad;
    long   image_data_size;
    
    /* allocate static buffer if we do not have one yet... */      
    if( handle->static_buffer == NULL )
    {
      handle->static_buffer = malloc(XLIB_STATIC_IMAGE_BUFFER_SIZE);
      if(!handle->static_buffer)
        return; /* error - no memory */
    }
    
    /* fill the XImage structure... */
    memset(&ximage, 0, sizeof(ximage));
    
    if (handle->bitmap) 
    {
      format = XYBitmap;
      depth  = 1;
      xpad   = 8;
    }
    else 
    {
      format = ZPixmap;
      depth  = handle->x_visual_info->depth;
      xpad   = 32;
    }

    ximage.width            = width;
    ximage.height           = height;
    ximage.format           = format;
    ximage.byte_order       = XImageByteOrder(handle->display);
    ximage.bitmap_unit      = XBitmapUnit(handle->display);
    ximage.bitmap_bit_order = XBitmapBitOrder(handle->display);
    ximage.red_mask         = handle->x_visual_info->visual->red_mask;
    ximage.green_mask       = handle->x_visual_info->visual->green_mask;
    ximage.blue_mask        = handle->x_visual_info->visual->blue_mask;
    if (format == ZPixmap) 
      ximage.bits_per_pixel = xxlib_get_bits_per_pixel(handle, depth);
    ximage.xoffset          = 0;
    ximage.bitmap_pad       = xpad;
    ximage.depth            = depth;
    ximage.data             = NULL;
    ximage.bytes_per_line   = 0; /* let XInitImage() calculate that... */
    ximage.obdata           = NULL;
    ximage.bitmap_bit_order = MSBFirst;
    ximage.byte_order       = MSBFirst;

    if(!XInitImage(&ximage))
    {
#ifdef DSIABLED_FOR_NOW_DUE_LINK_ISSUES
      NS_ERROR("xlib_draw_rgb_image_core: XInitImage() failure - should not happen...\n");
#endif /* DSIABLED_FOR_NOW_DUE_LINK_ISSUES */    
      return; /* error - should not happen... */
    }
    
    image_data_size = height*ximage.bytes_per_line;     

    if (image_data_size > XLIB_STATIC_IMAGE_BUFFER_SIZE)
    {
#ifdef VERBOSE
      printf("xlib_draw_rgb_image_core: Allocating extra large buffer(%ld > %ld)...\n",
             (long)image_data_size, (long)XLIB_STATIC_IMAGE_BUFFER_SIZE);
#endif /* VERBOSE */
      ximage.data = malloc(image_data_size);
      if (!ximage.data)
        return; /* error - no memory */
    }
    else
    {
      ximage.data = handle->static_buffer; 
    }

    conv (handle, &ximage, 0, 0, width, height, buf, rowstride,
          0, 0, cmap);

#ifndef DONT_ACTUALLY_DRAW
    XPutImage(handle->display, drawable, gc, &ximage,
    0, 0, x, y, (unsigned int)width, (unsigned int)height);
#endif

    /* free any extra memory we may have allocated above */
    if (ximage.data != handle->static_buffer)
      free(ximage.data);
  }
#else
  /* this is the clean&pretty version of the code above... */
  {
    XImage *image;
    
    if (handle->bitmap) 
    {
      image = XCreateImage(handle->display,
                           handle->x_visual_info->visual,
                           1,
                           XYBitmap,
                           0, 0, width, height,
                           8, 0);
    }
    else 
    {
      image = XCreateImage(handle->display,
                           handle->x_visual_info->visual,
                           (unsigned int)handle->x_visual_info->depth,
                           ZPixmap,
                           0, 0, width, height,
                           32, 0);
    }

    /* Use malloc() instead of g_malloc since X will free() this mem */
    image->data = malloc(height*image->bytes_per_line);
    image->bitmap_bit_order = MSBFirst;
    image->byte_order       = MSBFirst;      

    conv( handle, image, 0, 0, width, height, buf, rowstride,
          0, 0, cmap);

#ifndef DONT_ACTUALLY_DRAW
    XPutImage(handle->display, drawable, gc, image,
    0, 0, x, y, (unsigned int)width, (unsigned int)height);
#endif

    XDestroyImage(image);
  }
#endif /* XLIB_USE_FAST_BUT_UGLY_CODE */  
}


void
xxlib_draw_rgb_image (XlibRgbHandle *handle, Drawable drawable,
                     GC gc,
                     int x,
                     int y,
                     int width,
                     int height,
                     XlibRgbDither dith,
                     unsigned char *rgb_buf,
                     int rowstride)
{
  if (dith == XLIB_RGB_DITHER_NONE || (dith == XLIB_RGB_DITHER_NORMAL &&
                                      !handle->dith_default))
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, handle->conv, NULL,
                              0, 0);
  else
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, handle->conv_d, NULL,
                              0, 0);
}

void
xxlib_draw_rgb_image_dithalign (XlibRgbHandle *handle, Drawable drawable,
                              GC gc,
                              int x,
                              int y,
                              int width,
                              int height,
                              XlibRgbDither dith,
                              unsigned char *rgb_buf,
                              int rowstride,
                              int xdith,
                              int ydith)
{
  if (dith == XLIB_RGB_DITHER_NONE || (dith == XLIB_RGB_DITHER_NORMAL &&
                                       !handle->dith_default))
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, handle->conv, NULL,
                              xdith, ydith);
  else
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                               rgb_buf, 3, rowstride, handle->conv_d, NULL,
                               xdith, ydith);
}

void
xxlib_draw_rgb_32_image (XlibRgbHandle *handle, Drawable drawable,
                        GC gc,
                        int x,
                        int y,
                        int width,
                        int height,
                        XlibRgbDither dith,
                        unsigned char *buf,
                        int rowstride)
{
  if (dith == XLIB_RGB_DITHER_NONE || (dith == XLIB_RGB_DITHER_NORMAL &&
                                       !handle->dith_default))
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                               buf, 4, rowstride,
                               handle->conv_32, NULL, 0, 0);
  else
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                               buf, 4, rowstride,
                               handle->conv_32_d, NULL, 0, 0);
}

static void
xxlib_rgb_make_gray_cmap (XlibRgbHandle *handle)
{
  uint32 rgb[256];
  int i;

  for (i = 0; i < 256; i++)
    rgb[i] = (i << 16)  | (i << 8) | i;
  handle->gray_cmap = xxlib_rgb_cmap_new (handle, rgb, 256);
}

void
xxlib_draw_gray_image (XlibRgbHandle *handle, Drawable drawable,
                      GC gc,
                      int x,
                      int y,
                      int width,
                      int height,
                      XlibRgbDither dith,
                      unsigned char *buf,
                      int rowstride)
{
  if (handle->bpp == 1 &&
      handle->gray_cmap == NULL &&
      (handle->x_visual_info->class == PseudoColor ||
       handle->x_visual_info->class == GrayScale))
    xxlib_rgb_make_gray_cmap (handle);
  
  if (dith == XLIB_RGB_DITHER_NONE || (dith == XLIB_RGB_DITHER_NORMAL &&
                                      !handle->dith_default))
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                              buf, 1, rowstride,
                              handle->conv_gray, NULL, 0, 0);
  else
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                              buf, 1, rowstride,
                              handle->conv_gray_d, NULL, 0, 0);
}

XlibRgbCmap *
xxlib_rgb_cmap_new (XlibRgbHandle *handle, uint32 *colors, int n_colors)
{
  XlibRgbCmap *cmap;
  int i, j;
  uint32 rgb;

  if (n_colors < 0)
    return NULL;
  if (n_colors > 256)
    return NULL;
  cmap = malloc(sizeof(XlibRgbCmap));
  memcpy (cmap->colors, colors, n_colors * sizeof(uint32));
  if (handle->bpp == 1 &&
      (handle->x_visual_info->class == PseudoColor ||
       handle->x_visual_info->class == GrayScale))
    for (i = 0; i < n_colors; i++)
      {
        rgb = colors[i];
        j = ((rgb & 0xf00000) >> 12) |
                   ((rgb & 0xf000) >> 8) |
                   ((rgb & 0xf0) >> 4);
#ifdef VERBOSE
        printf ("%d %x %x %d\n", i, j, handle->colorcube[j]);
#endif
        cmap->lut[i] = handle->colorcube[j];
      }
  return cmap;
}

void
xxlib_rgb_cmap_free (XlibRgbHandle *handle, XlibRgbCmap *cmap)
{
  free (cmap);
}

void
xxlib_draw_indexed_image (XlibRgbHandle *handle, Drawable drawable,
                        GC gc,
                        int x,
                        int y,
                        int width,
                        int height,
                        XlibRgbDither dith,
                        unsigned char *buf,
                        int rowstride,
                        XlibRgbCmap *cmap)
{
  if (dith == XLIB_RGB_DITHER_NONE || (dith == XLIB_RGB_DITHER_NORMAL &&
                                       !handle->dith_default))
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                               buf, 1, rowstride,
                               handle->conv_indexed, cmap, 0, 0);
  else
    xxlib_draw_rgb_image_core (handle, drawable, gc, x, y, width, height,
                               buf, 1, rowstride,
                               handle->conv_indexed_d, cmap, 0, 0);
}

void
xxlib_draw_xprint_scaled_rgb_image( XlibRgbHandle *handle,
                                    Drawable drawable,
                                    long paper_resolution,
                                    long image_resolution,
                                    GC gc,
                                    int x,
                                    int y,
                                    int width,
                                    int height,
                                    XlibRgbDither dith,
                                    unsigned char *rgb_buf,
                                    int rowstride)
{
  long available = ((65536 < handle->max_request_size) ? 
                    (65536 << 1):(handle->max_request_size << 1))
               - 512 /* SIZEOF(xPutImageReq) */;
                
  if (image_resolution == 0)
    image_resolution = paper_resolution;

  if( (rowstride * height) < available )
  {
    xxlib_draw_rgb_image(handle,
                         drawable,
                         gc,
                         x, y, width, height,
                         dith,
                         rgb_buf, rowstride);
  }
  else
  {
    int    subimageheight = available / rowstride;
    double scaling_factor = (double)paper_resolution / (double)image_resolution;

#ifdef DEBUG    
    printf("xxlib_draw_xprint_scaled_rgb_image: "
           "splitting image x=%d, y=%d, width=%d, height=%d, subimageheight=%d, scaling_factor=%g, max_request_size=%ld, available=%ld\n",
           x, y, width, height, subimageheight, scaling_factor, (long)handle->max_request_size, (long)available);
#endif /* DEBUG */

    if (subimageheight == 0)
        subimageheight = 1;

      xxlib_draw_xprint_scaled_rgb_image(handle,
                                         drawable,
                                         paper_resolution, image_resolution,
                                         gc,
                                         x, y,
                                         width, subimageheight,
                                         dith,
                                         rgb_buf,
                                         rowstride);

      xxlib_draw_xprint_scaled_rgb_image(handle,
                                         drawable,
                                         paper_resolution, image_resolution,
                                         gc,
                                         x, y+(int)((double)subimageheight*scaling_factor), 
                                         width, (height-subimageheight),
                                         dith,
                                         (rgb_buf+(subimageheight*rowstride)),
                                         rowstride);
  }
}

Bool
xxlib_rgb_ditherable (XlibRgbHandle *handle)
{
  return (handle->conv != handle->conv_d);
}

Colormap
xxlib_rgb_get_cmap (XlibRgbHandle *handle)
{
  return (handle)?(handle->cmap):(None);
}

Visual *
xxlib_rgb_get_visual (XlibRgbHandle *handle)
{
  /* xxlib_rgb_init (); */
  return (handle)?(handle->x_visual_info->visual):(NULL);
}

XVisualInfo *
xxlib_rgb_get_visual_info (XlibRgbHandle *handle)
{
  /* xxlib_rgb_init (); */
  return (handle)?(handle->x_visual_info):(NULL);
}

int
xxlib_rgb_get_depth (XlibRgbHandle *handle)
{
  XVisualInfo *v = xxlib_rgb_get_visual_info(handle);

  return (v)?(v->depth):(0);
}

Display *
xxlib_rgb_get_display (XlibRgbHandle *handle)
{ 
  return (handle)?(handle->display):(NULL);
}

Screen *
xxlib_rgb_get_screen (XlibRgbHandle *handle)
{
  return (handle)?(handle->screen):(NULL);
}

typedef struct _RegisteredHandle
{
  const char    *name;
  XlibRgbHandle *handle;
} RegisteredHandle;

static RegisteredHandle *registered_handles      = NULL;
static unsigned int      registered_handles_size = 0;

/* find registered handle by name */
static
RegisteredHandle *xxlib_find_registered_handle(const char *name)
{
  unsigned int i;
  
  for( i=0 ; i < registered_handles_size ; i++ )
  {
    if (name && registered_handles[i].name && 
        !strcmp(name, registered_handles[i].name))
      return &registered_handles[i];
  }
  
  return NULL;
}

/* register handle.
 * This API is public to register a handle more then once (=alias), or if the handle 
 * has not been registered yet (e.g. |xxlib_rgb_create_handle()| called with
 * a NULL-|name| argument).
 */
Bool xxlib_register_handle(const char *name, XlibRgbHandle *handle)
{
  RegisteredHandle *entry = NULL;
  unsigned int i;
  
  if (xxlib_find_handle(name) || (handle == NULL))
    return False;
  
  /* search for a free slot... */  
  for( i=0 ; i < registered_handles_size ; i++ )
  {
    if (!registered_handles[i].handle)
    {
      entry = &registered_handles[i];
      break;
    }
  }
  
  /* ... no unused entry found ? Then allocate a new one... */
  if (!entry)
  {
    registered_handles_size++;
    registered_handles = realloc(registered_handles, sizeof(RegisteredHandle)*registered_handles_size);
  
    if (!registered_handles)
      abort();
    entry = &registered_handles[registered_handles_size-1];
  }

  entry->name   = strdup(name);
  entry->handle = handle;
  
  return True;
}

/* unregister the given handle by name. 
 * Return |True| if the |name| was found, |False| otherwise.
 * Note that |xxlib_rgb_destroy_handle()| unregisters the handle 
 * automagically (including all aliases).
 */
Bool xxlib_deregister_handle(const char *name)
{
  RegisteredHandle *entry;
  if ((entry = xxlib_find_registered_handle(name)) != NULL)
  {
    free((void *)entry->name);
    entry->name   = NULL;
    entry->handle = NULL;
    return True;
  }
  
  return False;  
}

/* used by |xxlib_rgb_destroy_handle()| to deregister handle and all
 * it's aliases... */
static
void xxlib_deregister_handle_by_handle(XlibRgbHandle *handle)
{
  unsigned int i;
  
  if (!handle)
    return;
  
  for( i=0 ; i < registered_handles_size ; i++ )
  {
    if (registered_handles[i].handle == handle)
    {
      free((void *)registered_handles[i].name);
      registered_handles[i].name   = NULL;
      registered_handles[i].handle = NULL;    
    }
  }
}

/* find a registered handle by |name| */
XlibRgbHandle *xxlib_find_handle(const char *name)
{
  RegisteredHandle *entry = xxlib_find_registered_handle(name);
  return (entry)?(entry->handle):(NULL);
}



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