gdkrgb.c

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/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/* For more information on GdkRgb, see http://www.levien.com/gdkrgb/

   Raph Levien <raph@acm.org>
   */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#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


#define ENABLE_GRAYSCALE

#ifdef GDK_RGB_STANDALONE

/* Compiling as a standalone module (i.e. with Gtk 1.0) */
/* gtk/gtk.h is already included in gdkrgbstub.c */
#include "config.h"
#include <gdk/gdkprivate.h>

#else

/* Compiling as a part of Gtk 1.1 or later */
#include "config.h"
#include "gdkprivate.h"

#endif

#include "gdk.h"                /* For gdk_flush() */
#include "gdkrgb.h"

typedef struct _GdkRgbInfo GdkRgbInfo;

typedef void (*GdkRgbConvFunc) (GdkImage * image,
                                gint x0, gint y0,
                                gint width, gint height,
                                guchar * buf, int rowstride,
                                gint x_align, gint y_align,
                                GdkRgbCmap * cmap);

static const gchar *visual_names[] = {
   "static gray",
   "grayscale",
   "static color",
   "pseudo color",
   "true color",
   "direct color",
};

/* 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 _GdkRgbInfo {
   GdkVisual *visual;
   GdkColormap *cmap;

   gulong *color_pixels;
   gulong *gray_pixels;
   gulong *reserved_pixels;

   guint nred_shades;
   guint ngreen_shades;
   guint nblue_shades;
   guint ngray_shades;
   guint nreserved;

   guint bpp;
   gint cmap_alloced;
   gdouble gamma;

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

   GdkRgbCmap *gray_cmap;

   gboolean dith_default;

   gboolean bitmap;             /* set true if in 1 bit per pixel mode */
   GdkGC *own_gc;

   /* Convert functions */
   GdkRgbConvFunc conv;
   GdkRgbConvFunc conv_d;

   GdkRgbConvFunc conv_32;
   GdkRgbConvFunc conv_32_d;

   GdkRgbConvFunc conv_gray;
   GdkRgbConvFunc conv_gray_d;

   GdkRgbConvFunc conv_indexed;
   GdkRgbConvFunc conv_indexed_d;
};

static gboolean gdk_rgb_install_cmap = FALSE;
static gint gdk_rgb_min_colors = 5 * 5 * 5;
static gboolean gdk_rgb_verbose = FALSE;

#define IMAGE_WIDTH 256
#define STAGE_ROWSTRIDE (IMAGE_WIDTH * 3)
#define IMAGE_HEIGHT 64
#define N_IMAGES 6

static GdkRgbInfo *image_info = NULL;
static GdkImage *static_image[N_IMAGES];
static gint static_image_idx;

static guchar *colorcube;
static guchar *colorcube_d;

static gint
gdk_rgb_cmap_fail(const char *msg, GdkColormap * cmap, gulong * pixels)
{
   gulong free_pixels[256];
   gint n_free;
   gint i;

#ifdef VERBOSE
   g_print("%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)
      gdk_colors_free(cmap, free_pixels, n_free, 0);
   return 0;
}

static void
gdk_rgb_make_colorcube(gulong * pixels, gint nr, gint ng, gint nb)
{
   guchar rt[16], gt[16], bt[16];
   gint i;

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

/* this is the colorcube suitable for dithering */
static void
gdk_rgb_make_colorcube_d(gulong * pixels, gint nr, gint ng, gint nb)
{
   gint r, g, b;
   gint i;

   colorcube_d = g_new(guchar, 512);
   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);
      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 gint gdk_rgb_try_colormap(gint nr, gint ng, gint nb)
{
   gint r, g, b;
   gint ri, gi, bi;
   gint r0, g0, b0;
   GdkColormap *cmap;
   GdkColor color;
   gulong pixels[256];
   gulong junk[256];
   gint i;
   gint d2;
   gint colors_needed;
   gint idx;
   gint best[256];

   if (nr * ng * nb < gdk_rgb_min_colors)
      return FALSE;

   if (image_info->cmap_alloced)
      cmap = image_info->cmap;
   else
      cmap = gdk_colormap_get_system();

   colors_needed = nr * ng * nb;
   for (i = 0; i < 256; i++) {
      best[i] = 192;
      pixels[i] = 256;
   }

#ifndef GAMMA
   if (!gdk_rgb_install_cmap)
      /* find color cube colors that are already present */
      for (i = 0; i < MIN(256, cmap->size); i++) {
         r = cmap->colors[i].red >> 8;
         g = cmap->colors[i].green >> 8;
         b = cmap->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)
               gdk_colors_free(cmap, pixels + idx, 1, 0);
            else
               colors_needed--;
            color = cmap->colors[i];
            if (!gdk_color_alloc(cmap, &color))
               return gdk_rgb_cmap_fail("error allocating system color\n",
                                        cmap, pixels);
            pixels[idx] = color.pixel;  /* which is almost certainly i */
            best[idx] = d2;
         }
      }
#endif

   if (colors_needed) {
      if (!gdk_colors_alloc(cmap, 0, NULL, 0, junk, colors_needed)) {
         char tmp_str[80];

         sprintf(tmp_str,
                 "%d %d %d colormap failed (in gdk_colors_alloc)\n",
                 nr, ng, nb);
         return gdk_rgb_cmap_fail(tmp_str, cmap, pixels);
      }

      gdk_colors_free(cmap, junk, 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

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

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

   image_info->nred_shades = nr;
   image_info->ngreen_shades = ng;
   image_info->nblue_shades = nb;
   gdk_rgb_make_colorcube(pixels, nr, ng, nb);
   gdk_rgb_make_colorcube_d(pixels, nr, ng, nb);
   return TRUE;
}

/* Return TRUE on success. */
static gboolean gdk_rgb_do_colormaps(void)
{
   static const gint 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 gint n_sizes = sizeof(sizes) / (3 * sizeof(gint));
   gint i;

   for (i = 0; i < n_sizes; i++)
      if (gdk_rgb_try_colormap(sizes[i][0], sizes[i][1], sizes[i][2]))
         return TRUE;
   return FALSE;
}

/* Make a 2 x 2 x 2 colorcube */
static void gdk_rgb_colorcube_222(void)
{
   int i;
   GdkColor color;
   GdkColormap *cmap;

   if (image_info->cmap_alloced)
      cmap = image_info->cmap;
   else
      cmap = gdk_colormap_get_system();

   colorcube_d = g_new(guchar, 512);

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

void gdk_rgb_set_verbose(gboolean verbose)
{
   gdk_rgb_verbose = verbose;
}

void gdk_rgb_set_install(gboolean install)
{
   gdk_rgb_install_cmap = install;
}

void gdk_rgb_set_min_colors(gint min_colors)
{
   gdk_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 guint32 gdk_rgb_score_visual(GdkVisual * visual)
{
   guint32 quality, speed, sys, pseudo;

   quality = 0;
   speed = 1;
   sys = 0;
   if (visual->type == GDK_VISUAL_TRUE_COLOR ||
       visual->type == GDK_VISUAL_DIRECT_COLOR) {
      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->type == GDK_VISUAL_PSEUDO_COLOR ||
              visual->type == GDK_VISUAL_STATIC_COLOR) {
      if (visual->depth == 8)
         quality = 4;
      else if (visual->depth == 4)
         quality = 2;
      else if (visual->depth == 1)
         quality = 1;
   } else if (visual->type == GDK_VISUAL_STATIC_GRAY
#ifdef ENABLE_GRAYSCALE
              || visual->type == GDK_VISUAL_GRAYSCALE
#endif
       ) {
      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 == gdk_visual_get_system());

   pseudo = (visual->type == GDK_VISUAL_PSEUDO_COLOR
             || visual->type == GDK_VISUAL_TRUE_COLOR);

   if (gdk_rgb_verbose)
      g_print("Visual type = %s, depth = %d, %x:%x:%x%s; score=%x\n",
              visual_names[visual->type],
              visual->depth,
              visual->red_mask,
              visual->green_mask,
              visual->blue_mask,
              sys ? " (system)" : "",
              (quality << 12) | (speed << 8) | (sys << 4) | pseudo);

   return (quality << 12) | (speed << 8) | (sys << 4) | pseudo;
}

static void gdk_rgb_choose_visual(void)
{
   GList *visuals, *tmp_list;
   guint32 score, best_score;
   GdkVisual *visual, *best_visual;

   visuals = gdk_list_visuals();
   tmp_list = visuals;

   best_visual = tmp_list->data;
   best_score = gdk_rgb_score_visual(best_visual);
   tmp_list = tmp_list->next;
   while (tmp_list) {
      visual = tmp_list->data;
      score = gdk_rgb_score_visual(visual);
      if (score > best_score) {
         best_score = score;
         best_visual = visual;
      }
      tmp_list = tmp_list->next;
   }

   g_list_free(visuals);

   image_info->visual = best_visual;
}

static void gdk_rgb_select_conv(GdkImage * image);

static void gdk_rgb_set_gray_cmap(GdkColormap * cmap)
{
   gint i;
   GdkColor color;
   gint status;
   gulong pixels[256];
   gint 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 = gdk_color_alloc(cmap, &color);
      pixels[i] = color.pixel;
#ifdef VERBOSE
      g_print("allocating pixel %d, %x %x %x, result %d\n",
              color.pixel, color.red, color.green, color.blue, status);
#endif
   }

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

   colorcube = g_new(guchar, 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;
      colorcube[i] = pixels[gray];
   }
}

void gdk_rgb_init(void)
{
   gint i;
   static const gint byte_order[1] = { 1 };

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

   if (image_info == NULL) {
      image_info = g_new0(GdkRgbInfo, 1);

      image_info->visual = NULL;
      image_info->cmap = NULL;

      image_info->color_pixels = NULL;
      image_info->gray_pixels = NULL;
      image_info->reserved_pixels = NULL;

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

      image_info->bpp = 0;
      image_info->cmap_alloced = FALSE;
      image_info->gamma = 1.0;

      image_info->stage_buf = NULL;

      image_info->own_gc = NULL;

      gdk_rgb_choose_visual();

      if ((image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR ||
           image_info->visual->type == GDK_VISUAL_STATIC_COLOR) &&
          image_info->visual->depth < 8 &&
          image_info->visual->depth >= 3) {
         image_info->cmap = gdk_colormap_get_system();
         gdk_rgb_colorcube_222();
      } else if (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR) {
         if (gdk_rgb_install_cmap ||
             image_info->visual != gdk_visual_get_system()) {
            image_info->cmap = gdk_colormap_new(image_info->visual, FALSE);
            image_info->cmap_alloced = TRUE;
         }
         if (!gdk_rgb_do_colormaps()) {
            image_info->cmap = gdk_colormap_new(image_info->visual, FALSE);
            image_info->cmap_alloced = TRUE;
            gdk_rgb_do_colormaps();
         }
         if (gdk_rgb_verbose)
            g_print("color cube: %d x %d x %d\n",
                    image_info->nred_shades,
                    image_info->ngreen_shades, image_info->nblue_shades);

         if (!image_info->cmap_alloced)
            image_info->cmap = gdk_colormap_get_system();
      }
#ifdef ENABLE_GRAYSCALE
      else if (image_info->visual->type == GDK_VISUAL_GRAYSCALE) {
         image_info->cmap = gdk_colormap_new(image_info->visual, FALSE);
         gdk_rgb_set_gray_cmap(image_info->cmap);
         image_info->cmap_alloced = TRUE;
      }
#endif
      else {
         /* Always install colormap in direct color. */
         if (image_info->visual->type != GDK_VISUAL_DIRECT_COLOR &&
             image_info->visual == gdk_visual_get_system())
            image_info->cmap = gdk_colormap_get_system();
         else {
            image_info->cmap = gdk_colormap_new(image_info->visual, FALSE);
            image_info->cmap_alloced = TRUE;
         }
      }

      image_info->bitmap = (image_info->visual->depth == 1);

      for (i = 0; i < N_IMAGES; i++)
         if (image_info->bitmap)
            /* Use malloc() instead of g_malloc since X will free() this mem */
            static_image[i] = gdk_image_new_bitmap(image_info->visual,
                                                   (gpointer)
                                                   malloc(IMAGE_WIDTH *
                                                          IMAGE_HEIGHT >>
                                                          3), IMAGE_WIDTH,
                                                   IMAGE_HEIGHT);
         else
            static_image[i] = gdk_image_new(GDK_IMAGE_FASTEST,
                                            image_info->visual,
                                            IMAGE_WIDTH, IMAGE_HEIGHT);

      image_info->bpp = static_image[0]->bpp;

      gdk_rgb_select_conv(static_image[0]);

   }
}

/* convert an rgb value into an X pixel code */
gulong gdk_rgb_xpixel_from_rgb(guint32 rgb)
{
   gulong pixel = 0;

   if (image_info->bitmap) {
      return ((rgb & 0xff0000) >> 16) +
          ((rgb & 0xff00) >> 7) + (rgb & 0xff) > 510;
   } else if (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR)
      pixel = colorcube[((rgb & 0xf00000) >> 12) |
                        ((rgb & 0xf000) >> 8) | ((rgb & 0xf0) >> 4)];
   else if (image_info->visual->depth < 8 &&
            image_info->visual->type == GDK_VISUAL_STATIC_COLOR) {
      pixel = colorcube_d[((rgb & 0x800000) >> 17) |
                          ((rgb & 0x8000) >> 12) | ((rgb & 0x80) >> 7)];
   } else if (image_info->visual->type == GDK_VISUAL_TRUE_COLOR ||
              image_info->visual->type == GDK_VISUAL_DIRECT_COLOR) {
#ifdef VERBOSE
      g_print("shift, prec: r %d %d g %d %d b %d %d\n",
              image_info->visual->red_shift,
              image_info->visual->red_prec,
              image_info->visual->green_shift,
              image_info->visual->green_prec,
              image_info->visual->blue_shift,
              image_info->visual->blue_prec);
#endif

      pixel = (((((rgb & 0xff0000) >> 16) >>
                 (8 - image_info->visual->red_prec)) <<
                image_info->visual->red_shift) +
               ((((rgb & 0xff00) >> 8) >>
                 (8 - image_info->visual->green_prec)) <<
                image_info->visual->green_shift) +
               (((rgb & 0xff) >>
                 (8 - image_info->visual->blue_prec)) <<
                image_info->visual->blue_shift));
   } else if (image_info->visual->type == GDK_VISUAL_STATIC_GRAY ||
              image_info->visual->type == GDK_VISUAL_GRAYSCALE) {
      int gray = ((rgb & 0xff0000) >> 16) +
          ((rgb & 0xff00) >> 7) + (rgb & 0xff);

      return gray >> (10 - image_info->visual->depth);
   }

   return pixel;
}

void gdk_rgb_gc_set_foreground(GdkGC * gc, guint32 rgb)
{
   GdkColor color;

   color.pixel = gdk_rgb_xpixel_from_rgb(rgb);
   gdk_gc_set_foreground(gc, &color);
}

void gdk_rgb_gc_set_background(GdkGC * gc, guint32 rgb)
{
   GdkColor color;

   color.pixel = gdk_rgb_xpixel_from_rgb(rgb);
   gdk_gc_set_background(gc, &color);
}

#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define HAIRY_CONVERT_8
#endif

#ifdef HAIRY_CONVERT_8
static void
gdk_rgb_convert_8(GdkImage * image,
                  gint x0, gint y0, gint width, gint height,
                  guchar * buf, int rowstride,
                  gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   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] = colorcube[((r & 0xf0) << 4) |
                                 (g & 0xf0) | (b >> 4)];
            obptr++;
         }
      } else {
         for (x = 0; x < width - 3; x += 4) {
            guint32 r1b0g0r0;
            guint32 g2r2b1g1;
            guint32 b3g3r3b2;

            r1b0g0r0 = ((guint32 *) bp2)[0];
            g2r2b1g1 = ((guint32 *) bp2)[1];
            b3g3r3b2 = ((guint32 *) bp2)[2];
            ((guint32 *) obptr)[0] =
                colorcube[((r1b0g0r0 & 0xf0) << 4) |
                          ((r1b0g0r0 & 0xf000) >> 8) |
                          ((r1b0g0r0 & 0xf00000) >> 20)] |
                (colorcube[((r1b0g0r0 & 0xf0000000) >> 20) |
                           (g2r2b1g1 & 0xf0) |
                           ((g2r2b1g1 & 0xf000) >> 12)] << 8) |
                (colorcube[((g2r2b1g1 & 0xf00000) >> 12) |
                           ((g2r2b1g1 & 0xf0000000) >> 24) |
                           ((b3g3r3b2 & 0xf0) >> 4)] << 16) |
                (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] = colorcube[((r & 0xf0) << 4) |
                                 (g & 0xf0) | (b >> 4)];
            obptr++;
         }
      }
      bptr += rowstride;
      obuf += bpl;
   }
}
#else
static void
gdk_rgb_convert_8(GdkImage * image,
                  gint x0, gint y0, gint width, gint height,
                  guchar * buf, int rowstride,
                  gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   for (y = 0; y < height; y++) {
      bp2 = bptr;
      obptr = obuf;
      for (x = 0; x < width; x++) {
         r = *bp2++;
         g = *bp2++;
         b = *bp2++;
         obptr[0] = 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 guchar 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},
   {48, 53, 43, 12, 45, 63, 30, 37, 9, 34, 21, 1, 25, 47, 29, 58, 3, 54,
    15, 39, 29, 17, 38, 35, 20, 43, 1, 49, 15, 59, 29, 39, 22, 35, 16, 23,
    1, 47, 39, 18, 8, 44, 25, 31, 57, 19, 63, 4, 45, 3, 42, 61, 1, 31, 45,
    20, 57, 29, 62, 21, 32, 41, 14, 44, 3, 39, 5, 34, 10, 43, 51, 35, 23,
    52, 40, 10, 21, 1, 53, 18, 51, 43, 12, 62, 18, 54, 26, 51, 20, 57, 14,
    1, 62, 16, 11, 18, 32, 39, 17, 44, 1, 48, 26, 37, 18, 2, 51, 14, 28,
    45, 35, 18, 57, 13, 47, 11, 51, 20, 2, 39, 31, 47, 25, 1, 50, 11, 60,
    7},
   {18, 28, 1, 56, 21, 10, 51, 2, 46, 54, 14, 61, 11, 50, 13, 38, 19, 31,
    45, 9, 55, 24, 47, 5, 54, 9, 62, 11, 35, 8, 51, 14, 57, 6, 63, 40, 58,
    14, 51, 28, 62, 34, 15, 48, 1, 41, 30, 35, 55, 21, 34, 11, 49, 37, 8,
    52, 4, 23, 15, 43, 1, 58, 11, 23, 53, 16, 55, 26, 58, 18, 27, 12, 45,
    14, 25, 63, 42, 33, 27, 35, 9, 31, 21, 38, 1, 44, 34, 12, 48, 38, 21,
    44, 29, 47, 26, 53, 1, 46, 54, 8, 59, 29, 11, 55, 22, 41, 33, 20, 39,
    1, 48, 9, 44, 32, 5, 62, 29, 44, 57, 23, 10, 58, 34, 43, 15, 37, 26,
    33},
   {51, 38, 59, 24, 35, 42, 19, 60, 5, 32, 41, 26, 43, 33, 7, 53, 48, 11,
    59, 23, 42, 2, 61, 30, 16, 40, 32, 24, 56, 41, 19, 33, 37, 26, 47, 9,
    31, 22, 2, 45, 9, 54, 4, 37, 21, 52, 11, 23, 7, 57, 16, 25, 55, 18, 63,
    27, 46, 39, 56, 10, 50, 37, 29, 47, 19, 63, 24, 9, 46, 2, 39, 60, 9,
    57, 30, 7, 49, 11, 59, 3, 45, 57, 5, 60, 29, 22, 5, 60, 30, 9, 59, 18,
    40, 6, 57, 36, 30, 12, 24, 34, 15, 40, 52, 6, 49, 9, 58, 4, 63, 12, 26,
    61, 22, 53, 38, 16, 35, 14, 28, 50, 42, 17, 5, 28, 62, 20, 54, 12},
   {26, 6, 31, 15, 49, 6, 38, 27, 22, 49, 16, 56, 2, 62, 30, 21, 0, 36, 28,
    6, 49, 32, 13, 52, 26, 50, 19, 46, 3, 26, 62, 0, 53, 12, 29, 3, 53, 41,
    60, 24, 38, 13, 58, 16, 43, 9, 59, 39, 46, 28, 44, 40, 2, 33, 13, 41,
    16, 6, 47, 31, 26, 17, 57, 6, 38, 0, 42, 36, 29, 52, 20, 31, 48, 0, 34,
    56, 20, 36, 23, 54, 14, 41, 24, 37, 10, 55, 46, 25, 16, 45, 36, 4, 55,
    23, 15, 8, 50, 62, 5, 56, 44, 20, 13, 28, 59, 31, 24, 47, 31, 52, 37,
    17, 40, 0, 26, 49, 3, 60, 7, 33, 0, 61, 53, 40, 8, 45, 2, 41},
   {16, 63, 43, 4, 61, 24, 56, 13, 53, 8, 36, 12, 24, 41, 16, 46, 60, 26,
    52, 39, 14, 57, 21, 37, 0, 45, 7, 59, 38, 17, 43, 10, 45, 20, 61, 43,
    19, 11, 33, 17, 50, 32, 23, 61, 28, 49, 26, 0, 18, 51, 5, 60, 22, 58,
    29, 0, 59, 34, 19, 62, 3, 52, 7, 44, 30, 59, 13, 50, 15, 62, 7, 17, 38,
    22, 44, 15, 40, 4, 47, 28, 33, 17, 49, 16, 51, 40, 10, 56, 0, 53, 13,
    49, 28, 38, 60, 21, 43, 19, 37, 27, 3, 51, 34, 39, 0, 45, 15, 43, 10,
    21, 3, 55, 8, 33, 59, 10, 41, 18, 52, 24, 46, 20, 30, 13, 58, 22, 36,
    57},
   {50, 34, 11, 47, 29, 17, 44, 0, 33, 63, 28, 46, 52, 5, 57, 10, 42, 18,
    4, 63, 20, 8, 44, 10, 56, 34, 14, 29, 5, 54, 23, 59, 32, 49, 7, 34, 49,
    27, 56, 0, 42, 7, 46, 3, 40, 6, 54, 32, 62, 13, 36, 10, 47, 8, 35, 49,
    24, 51, 12, 40, 22, 35, 60, 12, 22, 51, 33, 4, 40, 25, 43, 55, 5, 54,
    12, 61, 26, 51, 8, 62, 0, 53, 7, 63, 2, 32, 19, 34, 42, 24, 31, 63, 2,
    10, 45, 33, 0, 48, 9, 61, 22, 47, 8, 62, 18, 56, 7, 54, 27, 57, 46, 30,
    50, 19, 45, 30, 56, 36, 22, 47, 11, 38, 3, 51, 32, 48, 18, 9},
   {0, 21, 40, 19, 52, 9, 37, 48, 20, 40, 3, 18, 27, 38, 35, 22, 31, 56,
    13, 35, 46, 28, 60, 40, 27, 18, 61, 50, 41, 30, 7, 36, 2, 25, 16, 57,
    5, 15, 47, 29, 55, 19, 30, 52, 15, 34, 20, 12, 43, 30, 20, 54, 25, 44,
    53, 12, 38, 5, 55, 27, 48, 15, 33, 27, 45, 8, 19, 28, 56, 11, 33, 49,
    18, 36, 29, 2, 45, 16, 39, 19, 31, 43, 27, 35, 20, 52, 26, 6, 61, 11,
    41, 17, 29, 51, 20, 56, 25, 32, 41, 17, 53, 31, 25, 14, 42, 23, 35, 16,
    38, 6, 34, 12, 15, 62, 6, 21, 13, 1, 63, 9, 55, 27, 43, 25, 14, 4, 31,
    55},
   {44, 29, 61, 2, 35, 58, 26, 15, 60, 10, 51, 59, 14, 55, 8, 50, 2, 44,
    25, 51, 1, 33, 16, 4, 48, 36, 2, 21, 12, 57, 48, 13, 51, 55, 40, 28,
    37, 62, 8, 39, 12, 63, 36, 10, 59, 24, 56, 47, 9, 50, 41, 1, 32, 17, 6,
    21, 61, 30, 9, 43, 1, 54, 41, 2, 54, 37, 48, 61, 1, 46, 21, 3, 58, 24,
    50, 32, 60, 10, 57, 25, 46, 12, 59, 4, 45, 13, 57, 47, 27, 39, 5, 58,
    47, 14, 35, 4, 52, 13, 60, 6, 36, 10, 45, 55, 4, 50, 29, 2, 61, 50, 25,
    58, 44, 24, 36, 42, 54, 28, 40, 32, 16, 56, 6, 62, 46, 39, 60, 23},
   {7, 48, 14, 54, 23, 40, 4, 45, 30, 22, 42, 32, 1, 44, 20, 29, 58, 8, 37,
    19, 41, 54, 24, 58, 9, 53, 25, 46, 34, 16, 23, 38, 27, 11, 18, 1, 52,
    21, 35, 22, 48, 5, 25, 45, 18, 38, 2, 27, 35, 4, 57, 15, 62, 39, 57,
    28, 42, 16, 36, 60, 24, 18, 10, 63, 20, 5, 16, 23, 37, 14, 59, 27, 41,
    8, 13, 42, 21, 35, 6, 50, 3, 38, 15, 48, 30, 39, 17, 3, 49, 14, 53, 33,
    24, 7, 61, 44, 11, 39, 23, 49, 19, 58, 1, 32, 36, 12, 60, 41, 20, 13,
    41, 4, 39, 1, 48, 8, 18, 51, 14, 44, 5, 37, 21, 34, 1, 26, 10, 37},
   {53, 36, 27, 9, 50, 12, 32, 55, 2, 57, 7, 17, 48, 34, 63, 15, 40, 26,
    62, 11, 49, 6, 31, 39, 22, 42, 6, 63, 1, 39, 60, 4, 42, 61, 32, 45, 24,
    44, 2, 60, 16, 41, 53, 1, 33, 61, 49, 17, 63, 23, 45, 26, 33, 3, 23,
    46, 2, 50, 20, 4, 45, 34, 49, 30, 39, 58, 44, 31, 53, 34, 6, 52, 30,
    47, 63, 1, 53, 22, 42, 31, 58, 23, 54, 22, 61, 8, 36, 59, 22, 35, 21,
    1, 55, 40, 27, 16, 30, 54, 2, 29, 43, 16, 39, 63, 21, 46, 26, 10, 48,
    32, 19, 53, 30, 56, 26, 60, 33, 4, 61, 23, 49, 59, 15, 53, 19, 58, 42,
    16},
   {20, 5, 59, 46, 25, 62, 7, 19, 43, 25, 37, 61, 11, 24, 4, 54, 12, 52, 3,
    32, 17, 61, 12, 47, 15, 55, 18, 31, 53, 28, 9, 50, 21, 6, 55, 9, 58,
    14, 54, 26, 33, 7, 31, 58, 13, 21, 8, 42, 29, 6, 37, 11, 48, 52, 14,
    60, 11, 39, 56, 32, 14, 58, 7, 26, 17, 4, 42, 8, 11, 47, 19, 38, 10,
    17, 26, 37, 9, 55, 28, 13, 18, 40, 6, 33, 1, 43, 25, 11, 51, 7, 62, 43,
    18, 37, 3, 57, 45, 9, 38, 58, 5, 52, 27, 7, 17, 53, 5, 57, 37, 2, 63,
    9, 22, 15, 11, 38, 25, 45, 35, 0, 28, 10, 41, 30, 50, 8, 31, 57},
   {49, 33, 16, 38, 1, 42, 51, 34, 53, 14, 28, 49, 30, 56, 36, 23, 43, 20,
    38, 56, 22, 45, 28, 0, 62, 35, 26, 44, 11, 19, 52, 35, 44, 15, 30, 38,
    10, 31, 40, 4, 46, 50, 20, 40, 27, 44, 51, 14, 56, 53, 19, 59, 7, 29,
    41, 19, 35, 25, 8, 52, 22, 44, 13, 53, 50, 32, 61, 24, 56, 25, 63, 0,
    45, 57, 33, 59, 16, 46, 4, 62, 50, 11, 60, 37, 52, 19, 55, 29, 37, 46,
    13, 26, 48, 10, 50, 34, 21, 63, 26, 13, 42, 33, 22, 55, 35, 28, 43, 15,
    24, 51, 27, 34, 46, 49, 58, 3, 52, 9, 57, 19, 48, 55, 3, 35, 12, 45,
    24, 3},
   {41, 11, 56, 28, 18, 31, 22, 10, 37, 6, 47, 13, 3, 41, 9, 46, 0, 48, 29,
    6, 34, 10, 55, 37, 20, 8, 49, 3, 41, 59, 14, 25, 0, 63, 19, 47, 27, 51,
    17, 57, 23, 10, 61, 6, 54, 3, 38, 31, 0, 22, 34, 43, 20, 55, 31, 0, 49,
    63, 29, 38, 3, 62, 28, 40, 0, 22, 14, 35, 2, 48, 15, 43, 23, 14, 3, 29,
    49, 20, 39, 34, 0, 44, 29, 9, 15, 47, 5, 42, 0, 31, 58, 5, 31, 61, 23,
    15, 0, 47, 19, 50, 24, 3, 59, 11, 44, 0, 31, 59, 6, 42, 17, 60, 0, 39,
    20, 31, 43, 17, 29, 40, 12, 25, 60, 22, 52, 15, 63, 29},
   {20, 52, 8, 44, 62, 4, 59, 49, 17, 63, 21, 39, 60, 18, 52, 27, 33, 59,
    14, 51, 59, 43, 24, 5, 51, 30, 57, 17, 32, 5, 37, 56, 48, 34, 42, 3,
    60, 5, 36, 13, 43, 37, 18, 34, 25, 12, 59, 24, 47, 36, 11, 50, 3, 38,
    9, 58, 16, 5, 43, 18, 47, 10, 37, 18, 59, 46, 29, 52, 40, 12, 34, 28,
    56, 36, 53, 7, 43, 8, 24, 52, 26, 17, 56, 43, 24, 32, 63, 20, 57, 16,
    22, 52, 36, 8, 41, 56, 29, 32, 54, 7, 35, 57, 14, 48, 20, 62, 13, 39,
    53, 29, 8, 45, 13, 29, 7, 61, 14, 54, 6, 63, 38, 32, 18, 43, 2, 39, 6,
    47},
   {0, 58, 23, 35, 13, 46, 12, 39, 0, 31, 55, 24, 5, 35, 15, 61, 17, 5, 39,
    25, 18, 2, 50, 33, 41, 13, 39, 23, 62, 46, 29, 12, 22, 8, 56, 25, 20,
    49, 32, 62, 0, 56, 11, 46, 63, 42, 9, 16, 55, 5, 60, 15, 62, 26, 45,
    21, 36, 51, 13, 57, 31, 24, 55, 6, 35, 9, 57, 5, 20, 60, 7, 51, 5, 19,
    40, 25, 61, 32, 56, 12, 36, 48, 21, 2, 58, 12, 39, 28, 9, 50, 40, 12,
    44, 18, 25, 49, 6, 38, 11, 62, 18, 46, 30, 9, 40, 25, 49, 19, 10, 36,
    55, 22, 33, 52, 41, 18, 37, 27, 49, 21, 2, 46, 7, 53, 33, 61, 27, 35},
   {41, 31, 5, 39, 51, 26, 33, 57, 27, 41, 9, 44, 54, 29, 48, 7, 44, 36,
    57, 10, 31, 63, 16, 45, 11, 60, 1, 47, 7, 20, 43, 3, 58, 36, 13, 52,
    39, 7, 15, 28, 22, 48, 30, 21, 1, 29, 49, 44, 27, 17, 40, 30, 24, 42,
    12, 53, 33, 7, 47, 20, 1, 42, 11, 49, 25, 43, 17, 32, 45, 27, 41, 21,
    31, 62, 11, 49, 2, 15, 42, 5, 63, 7, 41, 27, 49, 6, 54, 23, 46, 34, 2,
    28, 54, 3, 59, 12, 46, 17, 42, 28, 40, 1, 37, 51, 5, 55, 2, 34, 47, 16,
    3, 62, 47, 5, 23, 56, 1, 44, 12, 34, 51, 16, 57, 11, 25, 17, 54, 13},
   {60, 26, 55, 18, 3, 60, 20, 6, 52, 15, 50, 19, 32, 11, 23, 53, 26, 21,
    1, 47, 42, 27, 8, 58, 21, 27, 53, 36, 26, 54, 31, 50, 17, 30, 45, 1,
    29, 59, 44, 53, 41, 4, 35, 58, 51, 19, 32, 4, 52, 34, 48, 8, 51, 5, 56,
    2, 25, 61, 27, 38, 54, 27, 62, 21, 51, 1, 39, 62, 10, 50, 1, 58, 13,
    47, 38, 18, 35, 54, 22, 51, 30, 19, 59, 34, 14, 32, 44, 4, 60, 15, 52,
    62, 20, 43, 30, 35, 21, 60, 4, 52, 12, 24, 61, 18, 30, 42, 23, 61, 25,
    50, 27, 38, 11, 59, 12, 35, 50, 30, 59, 24, 8, 42, 28, 37, 48, 9, 44,
    21},
   {10, 47, 15, 50, 30, 43, 8, 45, 29, 2, 36, 59, 1, 58, 41, 3, 63, 31, 54,
    20, 13, 55, 35, 38, 4, 44, 15, 9, 61, 2, 14, 38, 61, 10, 23, 54, 18,
    12, 24, 2, 14, 55, 16, 8, 38, 14, 41, 60, 10, 23, 1, 58, 32, 17, 28,
    37, 41, 15, 3, 60, 15, 33, 4, 36, 16, 59, 28, 14, 23, 55, 37, 18, 44,
    28, 2, 57, 30, 10, 27, 46, 14, 38, 3, 53, 21, 61, 17, 35, 10, 41, 26,
    7, 33, 9, 57, 1, 53, 37, 26, 20, 56, 48, 9, 33, 58, 16, 37, 7, 45, 1,
    57, 15, 32, 26, 42, 23, 7, 20, 4, 54, 31, 62, 22, 1, 59, 30, 4, 51},
   {36, 2, 38, 11, 24, 36, 54, 22, 62, 47, 25, 8, 28, 45, 16, 38, 12, 43,
    9, 37, 49, 3, 23, 52, 18, 30, 50, 33, 19, 42, 49, 26, 6, 40, 47, 35,
    63, 38, 50, 33, 60, 26, 36, 47, 24, 57, 6, 26, 39, 63, 19, 44, 14, 46,
    61, 9, 50, 30, 45, 23, 10, 50, 44, 8, 31, 54, 6, 46, 36, 4, 30, 54, 8,
    52, 22, 41, 4, 60, 40, 0, 58, 24, 45, 10, 37, 1, 48, 30, 56, 17, 38,
    48, 24, 47, 19, 39, 14, 8, 45, 32, 2, 34, 27, 44, 4, 52, 11, 56, 31,
    21, 40, 19, 44, 51, 2, 63, 46, 58, 36, 43, 14, 5, 50, 38, 14, 56, 40,
    23},
   {61, 46, 32, 63, 54, 1, 14, 34, 12, 40, 18, 49, 37, 10, 61, 30, 51, 24,
    60, 7, 29, 40, 62, 11, 46, 58, 6, 56, 24, 10, 34, 52, 21, 59, 16, 3,
    27, 5, 20, 46, 9, 40, 7, 62, 2, 30, 53, 15, 48, 10, 28, 35, 54, 6, 21,
    34, 18, 55, 7, 40, 57, 19, 26, 60, 41, 13, 24, 51, 19, 61, 9, 25, 34,
    15, 63, 11, 45, 17, 20, 47, 33, 8, 31, 62, 43, 26, 53, 7, 24, 59, 0,
    13, 55, 4, 62, 27, 51, 31, 63, 15, 58, 7, 54, 14, 46, 22, 28, 43, 12,
    63, 8, 54, 5, 17, 39, 33, 15, 10, 27, 17, 47, 34, 19, 45, 27, 12, 33,
    17},
   {5, 28, 21, 7, 17, 48, 42, 58, 23, 4, 63, 14, 55, 21, 34, 5, 19, 0, 45,
    17, 52, 15, 25, 32, 0, 22, 40, 13, 45, 62, 18, 0, 43, 11, 33, 55, 30,
    42, 57, 19, 51, 31, 22, 43, 18, 45, 34, 0, 43, 31, 56, 3, 23, 40, 59,
    0, 44, 13, 48, 35, 2, 32, 46, 0, 21, 48, 35, 3, 40, 32, 43, 59, 0, 48,
    33, 26, 53, 36, 55, 12, 51, 16, 55, 5, 18, 29, 11, 39, 51, 19, 45, 31,
    42, 21, 35, 6, 22, 47, 10, 38, 23, 50, 20, 36, 0, 60, 38, 4, 50, 35,
    48, 34, 24, 57, 9, 53, 28, 48, 61, 0, 56, 24, 53, 3, 63, 6, 42, 57},
   {13, 53, 45, 40, 58, 27, 6, 16, 38, 51, 33, 30, 43, 2, 47, 56, 40, 50,
    33, 57, 27, 5, 47, 42, 60, 36, 16, 54, 28, 4, 37, 57, 28, 51, 22, 8,
    45, 14, 6, 39, 0, 54, 11, 59, 28, 12, 50, 21, 61, 13, 19, 38, 49, 11,
    25, 37, 58, 29, 22, 63, 14, 56, 12, 53, 30, 63, 9, 57, 26, 12, 47, 16,
    23, 39, 50, 6, 31, 2, 25, 6, 28, 41, 36, 22, 50, 57, 42, 3, 34, 8, 28,
    61, 11, 50, 16, 54, 41, 0, 55, 43, 5, 29, 41, 63, 25, 16, 53, 18, 26,
    10, 21, 0, 61, 30, 41, 22, 3, 38, 20, 39, 29, 8, 41, 16, 36, 52, 22,
    19},
   {55, 34, 0, 25, 10, 32, 56, 44, 28, 0, 57, 7, 26, 53, 23, 8, 13, 35, 22,
    12, 36, 60, 20, 8, 14, 29, 48, 2, 41, 49, 23, 13, 39, 7, 48, 58, 25,
    53, 34, 62, 28, 16, 48, 4, 37, 56, 27, 5, 36, 52, 46, 7, 62, 33, 52,
    11, 17, 53, 5, 28, 41, 24, 38, 17, 5, 39, 20, 45, 15, 56, 5, 38, 60, 8,
    14, 57, 21, 48, 62, 39, 59, 13, 1, 60, 9, 32, 16, 63, 44, 25, 52, 15,
    36, 2, 60, 29, 12, 33, 25, 17, 59, 45, 13, 8, 49, 32, 6, 40, 59, 29,
    45, 37, 13, 47, 6, 55, 30, 45, 9, 52, 13, 59, 25, 47, 32, 1, 49, 30},
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    19},
   {0, 56, 8, 53, 14, 31, 61, 20, 55, 28, 62, 18, 35, 60, 25, 57, 7, 23,
    39, 54, 47, 17, 43, 0, 40, 59, 29, 2, 56, 10, 37, 5, 43, 11, 29, 52, 1,
    23, 54, 41, 59, 30, 55, 1, 62, 15, 33, 4, 43, 10, 47, 39, 1, 31, 40,
    60, 49, 33, 7, 55, 26, 50, 31, 61, 8, 18, 21, 32, 44, 1, 25, 47, 18,
    36, 30, 23, 59, 7, 40, 59, 27, 19, 38, 32, 44, 54, 40, 17, 38, 60, 27,
    6, 35, 55, 10, 14, 44, 5, 50, 17, 38, 26, 42, 50, 18, 3, 44, 52, 2, 49,
    7, 52, 15, 46, 62, 39, 55, 10, 31, 48, 3, 58, 33, 18, 61, 34, 13, 59},
   {39, 27, 63, 20, 35, 41, 4, 45, 26, 5, 38, 13, 44, 2, 50, 17, 37, 52, 2,
    13, 28, 58, 24, 51, 21, 8, 34, 48, 27, 42, 18, 51, 31, 56, 5, 36, 38,
    44, 4, 17, 26, 11, 38, 23, 42, 8, 56, 39, 24, 51, 5, 56, 21, 59, 14, 6,
    18, 42, 22, 35, 16, 37, 3, 25, 39, 46, 63, 5, 50, 17, 58, 8, 55, 3, 50,
    12, 43, 17, 47, 2, 51, 9, 62, 12, 1, 35, 13, 50, 1, 37, 12, 51, 19, 29,
    46, 59, 22, 58, 33, 45, 22, 60, 10, 32, 61, 39, 8, 33, 25, 36, 20, 60,
    38, 4, 21, 5, 28, 45, 12, 18, 42, 11, 49, 1, 27, 40, 6, 30},
   {24, 16, 42, 1, 50, 10, 48, 17, 33, 43, 24, 48, 21, 55, 31, 42, 10, 21,
    63, 35, 49, 6, 33, 13, 41, 53, 10, 20, 60, 6, 53, 26, 12, 41, 22, 60,
    14, 28, 63, 33, 49, 3, 45, 16, 48, 26, 14, 46, 18, 30, 35, 26, 8, 50,
    29, 51, 25, 57, 12, 47, 53, 9, 62, 20, 54, 2, 36, 15, 40, 28, 33, 13,
    38, 24, 46, 1, 29, 56, 33, 20, 44, 24, 41, 26, 57, 20, 63, 8, 30, 55,
    5, 41, 62, 8, 34, 2, 37, 10, 19, 6, 37, 1, 53, 23, 5, 27, 58, 22, 43,
    12, 50, 26, 9, 34, 54, 32, 49, 1, 59, 37, 22, 46, 25, 36, 51, 15, 54,
    46},
   {52, 7, 45, 33, 26, 58, 14, 60, 7, 54, 3, 58, 8, 34, 14, 5, 59, 30, 18,
    44, 8, 22, 48, 62, 3, 26, 55, 38, 23, 16, 39, 1, 62, 24, 49, 9, 53, 19,
    46, 7, 19, 60, 31, 58, 2, 34, 53, 7, 59, 2, 62, 42, 46, 19, 36, 11, 44,
    4, 38, 28, 1, 43, 32, 51, 12, 29, 56, 22, 52, 2, 62, 49, 22, 60, 14,
    35, 63, 5, 25, 57, 14, 53, 4, 46, 18, 31, 42, 22, 47, 20, 58, 31, 16,
    43, 23, 54, 30, 42, 52, 57, 29, 49, 30, 13, 45, 48, 16, 55, 6, 63, 1,
    44, 14, 58, 19, 47, 15, 24, 51, 34, 6, 55, 5, 63, 20, 41, 21, 9},
   {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 guchar 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 guint32 *DM_565 = NULL;

static void gdk_rgb_preprocess_dm_565(void)
{
   int i;
   guint32 dith;

   if (DM_565 == NULL) {
      DM_565 = g_new(guint32, DM_WIDTH * DM_HEIGHT);
      for (i = 0; i < DM_WIDTH * DM_HEIGHT; i++) {
         dith = DM[0][i] >> 3;
         DM_565[i] = (dith << 20) | dith | (((7 - dith) >> 1) << 10);
#ifdef VERBOSE
         g_print("%i %x %x\n", i, dith, DM_565[i]);
#endif
      }
   }
}

static void
gdk_rgb_convert_8_d666(GdkImage * image,
                       gint x0, gint y0, gint width, gint height,
                       guchar * buf, int rowstride,
                       gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   const guchar *dmp;
   gint dith;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   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] = colorcube_d[(r << 6) | (g << 3) | b];
         obptr++;
      }
      bptr += rowstride;
      obuf += bpl;
   }
}

static void
gdk_rgb_convert_8_d(GdkImage * image,
                    gint x0, gint y0, gint width, gint height,
                    guchar * buf, int rowstride,
                    gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   const guchar *dmp;
   gint dith;
   gint rs, gs, bs;

   bptr = buf;
   bpl = image->bpl;
   rs = image_info->nred_shades - 1;
   gs = image_info->ngreen_shades - 1;
   bs = image_info->nblue_shades - 1;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   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] = colorcube_d[(r << 6) | (g << 3) | b];
         obptr++;
      }
      bptr += rowstride;
      obuf += bpl;
   }
}

static void
gdk_rgb_convert_8_indexed(GdkImage * image,
                          gint x0, gint y0, gint width, gint height,
                          guchar * buf, int rowstride,
                          gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   guchar c;
   guchar *lut;

   lut = cmap->lut;
   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   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
gdk_rgb_convert_gray8(GdkImage * image,
                      gint x0, gint y0, gint width, gint height,
                      guchar * buf, int rowstride,
                      gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   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
gdk_rgb_convert_gray8_gray(GdkImage * image,
                           gint x0, gint y0, gint width, gint height,
                           guchar * buf, int rowstride,
                           gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int y;
   gint bpl;
   guchar *obuf;
   guchar *bptr;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   for (y = 0; y < height; y++) {
      memcpy(obuf, bptr, 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 GdkImage, without dithering.
   This assumes native byte ordering - what should really be done is to
   check whether 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
gdk_rgb_convert_565(GdkImage * image,
                    gint x0, gint y0, gint width, gint height,
                    guchar * buf, int rowstride,
                    gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   guchar r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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++;
            ((guint16 *) obptr)[0] = ((r & 0xf8) << 8) |
                ((g & 0xfc) << 3) | (b >> 3);
            obptr += 2;
         }
      } else {
         for (x = 0; x < width - 3; x += 4) {
            guint32 r1b0g0r0;
            guint32 g2r2b1g1;
            guint32 b3g3r3b2;

            r1b0g0r0 = ((guint32 *) bp2)[0];
            g2r2b1g1 = ((guint32 *) bp2)[1];
            b3g3r3b2 = ((guint32 *) bp2)[2];
            ((guint32 *) obptr)[0] =
                ((r1b0g0r0 & 0xf8) << 8) |
                ((r1b0g0r0 & 0xfc00) >> 5) |
                ((r1b0g0r0 & 0xf80000) >> 19) |
                (r1b0g0r0 & 0xf8000000) |
                ((g2r2b1g1 & 0xfc) << 19) | ((g2r2b1g1 & 0xf800) << 5);
            ((guint32 *) 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++;
            ((guint16 *) 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 GdkImage, without dithering.
   This assumes native byte ordering - what should really be done is to
   check whether 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
gdk_rgb_convert_565(GdkImage * image,
                    gint x0, gint y0, gint width, gint height,
                    guchar * buf, int rowstride,
                    gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   guchar r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_565_gray(GdkImage * image,
                         gint x0, gint y0, gint width, gint height,
                         guchar * buf, int rowstride,
                         gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   guchar g;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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++;
            ((guint16 *) obptr)[0] = ((g & 0xf8) << 8) |
                ((g & 0xfc) << 3) | (g >> 3);
            obptr += 2;
         }
      } else {
         for (x = 0; x < width - 3; x += 4) {
            guint32 g3g2g1g0;

            g3g2g1g0 = ((guint32 *) bp2)[0];
            ((guint32 *) obptr)[0] =
                ((g3g2g1g0 & 0xf8) << 8) |
                ((g3g2g1g0 & 0xfc) << 3) |
                ((g3g2g1g0 & 0xf8) >> 3) |
                (g3g2g1g0 & 0xf800) << 16 |
                ((g3g2g1g0 & 0xfc00) << 11) | ((g3g2g1g0 & 0xf800) << 5);
            ((guint32 *) 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++;
            ((guint16 *) obptr)[0] = ((g & 0xf8) << 8) |
                ((g & 0xfc) << 3) | (g >> 3);
            obptr += 2;
         }
      }
      bptr += rowstride;
      obuf += bpl;
   }
}
#else
static void
gdk_rgb_convert_565_gray(GdkImage * image,
                         gint x0, gint y0, gint width, gint height,
                         guchar * buf, int rowstride,
                         gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   guchar g;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 2;
   for (y = 0; y < height; y++) {
      bp2 = bptr;
      for (x = 0; x < width; x++) {
         g = *bp2++;
         ((guint16 *) obuf)[x] = ((g & 0xf8) << 8) |
             ((g & 0xfc) << 3) | (g >> 3);
      }
      bptr += rowstride;
      obuf += bpl;
   }
}
#endif

static void
gdk_rgb_convert_565_br(GdkImage * image,
                       gint x0, gint y0, gint width, gint height,
                       guchar * buf, int rowstride,
                       gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   guchar r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_565_d(GdkImage * image,
                      gint x0, gint y0, gint width, gint height,
                      guchar * buf, int rowstride,
                      gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   /* Now this is what I'd call some highly tuned code! */
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;

   width += x_align;
   height += y_align;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 2;
   for (y = y_align; y < height; y++) {
      guint32 *dmp = 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++) {
            gint32 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) {
            guint32 r1b0g0r0;
            guint32 g2r2b1g1;
            guint32 b3g3r3b2;
            guint32 rgb02, rgb13;

            r1b0g0r0 = ((guint32 *) bp2)[0];
            g2r2b1g1 = ((guint32 *) bp2)[1];
            b3g3r3b2 = ((guint32 *) 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);
            ((guint32 *) 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);
            ((guint32 *) 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++) {
            gint32 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
gdk_rgb_convert_565_d(GdkImage * image,
                      gint x0, gint y0, gint width, gint height,
                      guchar * buf, int rowstride,
                      gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr;

   width += x_align;
   height += y_align;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + (x0 - x_align) * 2;

   for (y = y_align; y < height; y++) {
      guint32 *dmp = DM_565 + ((y & (DM_HEIGHT - 1)) << DM_WIDTH_SHIFT);
      guchar *bp2 = bptr;

      for (x = x_align; x < width; x++) {
         gint32 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
gdk_rgb_convert_555(GdkImage * image,
                    gint x0, gint y0, gint width, gint height,
                    guchar * buf, int rowstride,
                    gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   guchar r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_555_br(GdkImage * image,
                       gint x0, gint y0, gint width, gint height,
                       guchar * buf, int rowstride,
                       gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   guchar r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_888_msb(GdkImage * image,
                        gint x0, gint y0, gint width, gint height,
                        guchar * buf, int rowstride,
                        gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int y;
   guchar *obuf;
   gint bpl;
   guchar *bptr;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 3;
   for (y = 0; y < height; y++) {
      memcpy(obuf, bptr, 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
gdk_rgb_convert_888_lsb(GdkImage * image,
                        gint x0, gint y0, gint width, gint height,
                        guchar * buf, int rowstride,
                        gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   int r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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) {
            guint32 r1b0g0r0;
            guint32 g2r2b1g1;
            guint32 b3g3r3b2;

            r1b0g0r0 = ((guint32 *) bp2)[0];
            g2r2b1g1 = ((guint32 *) bp2)[1];
            b3g3r3b2 = ((guint32 *) bp2)[2];
            ((guint32 *) obptr)[0] =
                (r1b0g0r0 & 0xff00) |
                ((r1b0g0r0 & 0xff0000) >> 16) |
                (((g2r2b1g1 & 0xff00) | (r1b0g0r0 & 0xff)) << 16);
            ((guint32 *) obptr)[1] =
                (g2r2b1g1 & 0xff0000ff) |
                ((r1b0g0r0 & 0xff000000) >> 16) |
                ((b3g3r3b2 & 0xff) << 16);
            ((guint32 *) 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
gdk_rgb_convert_888_lsb(GdkImage * image,
                        gint x0, gint y0, gint width, gint height,
                        guchar * buf, int rowstride,
                        gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   int r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_0888(GdkImage * image,
                     gint x0, gint y0, gint width, gint height,
                     guchar * buf, int rowstride,
                     gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   int r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 4;
   for (y = 0; y < height; y++) {
      bp2 = bptr;
      for (x = 0; x < width; x++) {
         r = bp2[0];
         g = bp2[1];
         b = bp2[2];
         ((guint32 *) obuf)[x] = (r << 16) | (g << 8) | b;
         bp2 += 3;
      }
      bptr += rowstride;
      obuf += bpl;
   }
}

static void
gdk_rgb_convert_0888_br(GdkImage * image,
                        gint x0, gint y0, gint width, gint height,
                        guchar * buf, int rowstride,
                        gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   int r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 4;
   for (y = 0; y < height; y++) {
      bp2 = bptr;
      for (x = 0; x < width; x++) {
         r = bp2[0];
         g = bp2[1];
         b = bp2[2];
         ((guint32 *) obuf)[x] = (b << 24) | (g << 16) | (r << 8);
         bp2 += 3;
      }
      bptr += rowstride;
      obuf += bpl;
   }
}

static void
gdk_rgb_convert_8880_br(GdkImage * image,
                        gint x0, gint y0, gint width, gint height,
                        guchar * buf, int rowstride,
                        gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf;
   gint bpl;
   guchar *bptr, *bp2;
   int r, g, b;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 4;
   for (y = 0; y < height; y++) {
      bp2 = bptr;
      for (x = 0; x < width; x++) {
         r = bp2[0];
         g = bp2[1];
         b = bp2[2];
         ((guint32 *) 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
gdk_rgb_convert_truecolor_lsb(GdkImage * image,
                              gint x0, gint y0, gint width, gint height,
                              guchar * buf, int rowstride,
                              gint x_align, gint y_align,
                              GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   gint r, g, b;
   gint r_right, r_left;
   gint g_right, g_left;
   gint b_right, b_left;
   gint bpp;
   guint32 pixel;
   gint i;

   r_right = 8 - image_info->visual->red_prec;
   r_left = image_info->visual->red_shift;
   g_right = 8 - image_info->visual->green_prec;
   g_left = image_info->visual->green_shift;
   b_right = 8 - image_info->visual->blue_prec;
   b_left = image_info->visual->blue_shift;
   bpp = image_info->bpp;
   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_truecolor_lsb_d(GdkImage * image,
                                gint x0, gint y0, gint width, gint height,
                                guchar * buf, int rowstride,
                                gint x_align, gint y_align,
                                GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   gint r, g, b;
   gint r_right, r_left, r_prec;
   gint g_right, g_left, g_prec;
   gint b_right, b_left, b_prec;
   gint bpp;
   guint32 pixel;
   gint i;
   gint dith;
   gint r1, g1, b1;
   const guchar *dmp;

   r_right = 8 - image_info->visual->red_prec;
   r_left = image_info->visual->red_shift;
   r_prec = image_info->visual->red_prec;
   g_right = 8 - image_info->visual->green_prec;
   g_left = image_info->visual->green_shift;
   g_prec = image_info->visual->green_prec;
   b_right = 8 - image_info->visual->blue_prec;
   b_left = image_info->visual->blue_shift;
   b_prec = image_info->visual->blue_prec;
   bpp = image_info->bpp;
   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_truecolor_msb(GdkImage * image,
                              gint x0, gint y0, gint width, gint height,
                              guchar * buf, int rowstride,
                              gint x_align, gint y_align,
                              GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   gint r, g, b;
   gint r_right, r_left;
   gint g_right, g_left;
   gint b_right, b_left;
   gint bpp;
   guint32 pixel;
   gint shift, shift_init;

   r_right = 8 - image_info->visual->red_prec;
   r_left = image_info->visual->red_shift;
   g_right = 8 - image_info->visual->green_prec;
   g_left = image_info->visual->green_shift;
   b_right = 8 - image_info->visual->blue_prec;
   b_left = image_info->visual->blue_shift;
   bpp = image_info->bpp;
   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_truecolor_msb_d(GdkImage * image,
                                gint x0, gint y0, gint width, gint height,
                                guchar * buf, int rowstride,
                                gint x_align, gint y_align,
                                GdkRgbCmap * cmap)
{
   int x, y;
   guchar *obuf, *obptr;
   gint bpl;
   guchar *bptr, *bp2;
   gint r, g, b;
   gint r_right, r_left, r_prec;
   gint g_right, g_left, g_prec;
   gint b_right, b_left, b_prec;
   gint bpp;
   guint32 pixel;
   gint shift, shift_init;
   gint dith;
   gint r1, g1, b1;
   const guchar *dmp;

   r_right = 8 - image_info->visual->red_prec;
   r_left = image_info->visual->red_shift;
   r_prec = image_info->visual->red_prec;
   g_right = 8 - image_info->visual->green_prec;
   g_left = image_info->visual->green_shift;
   g_prec = image_info->visual->green_prec;
   b_right = 8 - image_info->visual->blue_prec;
   b_left = image_info->visual->blue_shift;
   b_prec = image_info->visual->blue_prec;
   bpp = image_info->bpp;
   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0 * 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
gdk_rgb_convert_4(GdkImage * image,
                  gint x0, gint y0, gint width, gint height,
                  guchar * buf, int rowstride,
                  gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   const guchar *dmp;
   gint dith;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   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] = 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
gdk_rgb_convert_gray4(GdkImage * image,
                      gint x0, gint y0, gint width, gint height,
                      guchar * buf, int rowstride,
                      gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   gint shift;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   shift = 9 - image_info->visual->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
gdk_rgb_convert_gray4_pack(GdkImage * image,
                           gint x0, gint y0, gint width, gint height,
                           guchar * buf, int rowstride,
                           gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   gint shift;
   guchar pix0, pix1;
   /* todo: this is hardcoded to big-endian. Make endian-agile. */

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + (x0 >> 1);
   shift = 9 - image_info->visual->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
gdk_rgb_convert_gray4_d(GdkImage * image,
                        gint x0, gint y0, gint width, gint height,
                        guchar * buf, int rowstride,
                        gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   const guchar *dmp;
   gint prec, right;
   gint gray;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + x0;
   prec = image_info->visual->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
gdk_rgb_convert_gray4_d_pack(GdkImage * image,
                             gint x0, gint y0, gint width, gint height,
                             guchar * buf, int rowstride,
                             gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   const guchar *dmp;
   gint prec, right;
   gint gray;
   guchar pix0, pix1;
   /* todo: this is hardcoded to big-endian. Make endian-agile. */

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + (x0 >> 1);
   prec = image_info->visual->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
gdk_rgb_convert_1(GdkImage * image,
                  gint x0, gint y0, gint width, gint height,
                  guchar * buf, int rowstride,
                  gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   int x, y;
   gint bpl;
   guchar *obuf, *obptr;
   guchar *bptr, *bp2;
   gint r, g, b;
   const guchar *dmp;
   gint dith;
   guchar byte;

   bptr = buf;
   bpl = image->bpl;
   obuf = ((guchar *) image->mem) + y0 * bpl + (x0 >> 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 guchar *gdk_rgb_ensure_stage(void)
{
   if (image_info->stage_buf == NULL)
      image_info->stage_buf = g_malloc(IMAGE_HEIGHT * STAGE_ROWSTRIDE);
   return image_info->stage_buf;
}

/* This is slow. Speed me up, please. */
static void
gdk_rgb_32_to_stage(guchar * buf, gint rowstride, gint width, gint height)
{
   gint x, y;
   guchar *pi_start, *po_start;
   guchar *pi, *po;

   pi_start = buf;
   po_start = gdk_rgb_ensure_stage();
   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
gdk_rgb_convert_32_generic(GdkImage * image,
                           gint x0, gint y0, gint width, gint height,
                           guchar * buf, gint rowstride,
                           gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   gdk_rgb_32_to_stage(buf, rowstride, width, height);

   (*image_info->conv) (image, x0, y0, width, height,
                        image_info->stage_buf, STAGE_ROWSTRIDE,
                        x_align, y_align, cmap);
}

/* Generic 32bit RGB conversion function - convert to 24bit packed, then
   go from there. */
static void
gdk_rgb_convert_32_generic_d(GdkImage * image,
                             gint x0, gint y0, gint width, gint height,
                             guchar * buf, gint rowstride,
                             gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   gdk_rgb_32_to_stage(buf, rowstride, width, height);

   (*image_info->conv_d) (image, x0, y0, width, height,
                          image_info->stage_buf, STAGE_ROWSTRIDE,
                          x_align, y_align, cmap);
}

/* This is slow. Speed me up, please. */
static void
gdk_rgb_gray_to_stage(guchar * buf, gint rowstride, gint width,
                      gint height)
{
   gint x, y;
   guchar *pi_start, *po_start;
   guchar *pi, *po;
   guchar gray;

   pi_start = buf;
   po_start = gdk_rgb_ensure_stage();
   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
gdk_rgb_convert_gray_generic(GdkImage * image,
                             gint x0, gint y0, gint width, gint height,
                             guchar * buf, gint rowstride,
                             gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   gdk_rgb_gray_to_stage(buf, rowstride, width, height);

   (*image_info->conv) (image, x0, y0, width, height,
                        image_info->stage_buf, STAGE_ROWSTRIDE,
                        x_align, y_align, cmap);
}

static void
gdk_rgb_convert_gray_generic_d(GdkImage * image,
                               gint x0, gint y0, gint width, gint height,
                               guchar * buf, gint rowstride,
                               gint x_align, gint y_align,
                               GdkRgbCmap * cmap)
{
   gdk_rgb_gray_to_stage(buf, rowstride, width, height);

   (*image_info->conv_d) (image, x0, y0, width, height,
                          image_info->stage_buf, STAGE_ROWSTRIDE,
                          x_align, y_align, cmap);
}

/* Render grayscale using indexed method. */
static void
gdk_rgb_convert_gray_cmap(GdkImage * image,
                          gint x0, gint y0, gint width, gint height,
                          guchar * buf, gint rowstride,
                          gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   (*image_info->conv_indexed) (image, x0, y0, width, height,
                                buf, rowstride,
                                x_align, y_align, image_info->gray_cmap);
}

#if 0
static void
gdk_rgb_convert_gray_cmap_d(GdkImage * image,
                            gint x0, gint y0, gint width, gint height,
                            guchar * buf, gint rowstride,
                            gint x_align, gint y_align, GdkRgbCmap * cmap)
{
   (*image_info->conv_indexed_d) (image, x0, y0, width, height,
                                  buf, rowstride,
                                  x_align, y_align, image_info->gray_cmap);
}
#endif

/* This is slow. Speed me up, please. */
static void
gdk_rgb_indexed_to_stage(guchar * buf, gint rowstride, gint width,
                         gint height, GdkRgbCmap * cmap)
{
   gint x, y;
   guchar *pi_start, *po_start;
   guchar *pi, *po;
   gint rgb;

   pi_start = buf;
   po_start = gdk_rgb_ensure_stage();
   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
gdk_rgb_convert_indexed_generic(GdkImage * image,
                                gint x0, gint y0, gint width, gint height,
                                guchar * buf, gint rowstride,
                                gint x_align, gint y_align,
                                GdkRgbCmap * cmap)
{
   gdk_rgb_indexed_to_stage(buf, rowstride, width, height, cmap);

   (*image_info->conv) (image, x0, y0, width, height,
                        image_info->stage_buf, STAGE_ROWSTRIDE,
                        x_align, y_align, cmap);
}

static void
gdk_rgb_convert_indexed_generic_d(GdkImage * image,
                                  gint x0, gint y0, gint width,
                                  gint height, guchar * buf,
                                  gint rowstride, gint x_align,
                                  gint y_align, GdkRgbCmap * cmap)
{
   gdk_rgb_indexed_to_stage(buf, rowstride, width, height, cmap);

   (*image_info->conv_d) (image, x0, y0, width, height,
                          image_info->stage_buf, STAGE_ROWSTRIDE,
                          x_align, y_align, cmap);
}

/* Select a conversion function based on the visual and a
   representative image. */
static void gdk_rgb_select_conv(GdkImage * image)
{
   GdkByteOrder byte_order;
   gint depth, bpp, byterev;
   GdkVisualType vtype;
   guint32 red_mask, green_mask, blue_mask;
   GdkRgbConvFunc conv, conv_d;
   GdkRgbConvFunc conv_32, conv_32_d;
   GdkRgbConvFunc conv_gray, conv_gray_d;
   GdkRgbConvFunc conv_indexed, conv_indexed_d;
   gboolean mask_rgb, mask_bgr;

   depth = image_info->visual->depth;

   /* FIXME: save the bpp in the image; this is hack that works for
    *        common visuals, not otherwise.
    */
   if (depth <= 8)
      bpp = depth;
   else
      bpp = 8 * image->bpp;

   byte_order = image->byte_order;
   if (gdk_rgb_verbose)
      g_print("Chose visual type=%s depth=%d, image bpp=%d, %s first\n",
              visual_names[image_info->visual->type],
              image_info->visual->depth, bpp,
              byte_order == GDK_LSB_FIRST ? "lsb" : "msb");

#if G_BYTE_ORDER == G_BIG_ENDIAN
   byterev = (byte_order == GDK_LSB_FIRST);
#else
   byterev = (byte_order == GDK_MSB_FIRST);
#endif

   vtype = image_info->visual->type;
   if (vtype == GDK_VISUAL_DIRECT_COLOR)
      vtype = GDK_VISUAL_TRUE_COLOR;

   red_mask = image_info->visual->red_mask;
   green_mask = image_info->visual->green_mask;
   blue_mask = image_info->visual->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 = gdk_rgb_convert_32_generic;
   conv_32_d = gdk_rgb_convert_32_generic_d;

   conv_gray = gdk_rgb_convert_gray_generic;
   conv_gray_d = gdk_rgb_convert_gray_generic_d;

   conv_indexed = gdk_rgb_convert_indexed_generic;
   conv_indexed_d = gdk_rgb_convert_indexed_generic_d;

   image_info->dith_default = FALSE;

   if (image_info->bitmap)
      conv = gdk_rgb_convert_1;
   else if (bpp == 16 && depth == 16 && !byterev &&
            red_mask == 0xf800 && green_mask == 0x7e0 && blue_mask == 0x1f)
   {
      conv = gdk_rgb_convert_565;
      conv_d = gdk_rgb_convert_565_d;
      conv_gray = gdk_rgb_convert_565_gray;
      gdk_rgb_preprocess_dm_565();
   } else if (bpp == 16 && depth == 16 &&
              vtype == GDK_VISUAL_TRUE_COLOR && byterev &&
              red_mask == 0xf800 && green_mask == 0x7e0
              && blue_mask == 0x1f)
      conv = gdk_rgb_convert_565_br;

   else if (bpp == 16 && depth == 15 &&
            vtype == GDK_VISUAL_TRUE_COLOR && !byterev &&
            red_mask == 0x7c00 && green_mask == 0x3e0 && blue_mask == 0x1f)
      conv = gdk_rgb_convert_555;

   else if (bpp == 16 && depth == 15 &&
            vtype == GDK_VISUAL_TRUE_COLOR && byterev &&
            red_mask == 0x7c00 && green_mask == 0x3e0 && blue_mask == 0x1f)
      conv = gdk_rgb_convert_555_br;

   /* I'm not 100% sure about the 24bpp tests - but testing will show */
   else if (bpp == 24 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            ((mask_rgb && byte_order == GDK_LSB_FIRST) ||
             (mask_bgr && byte_order == GDK_MSB_FIRST)))
      conv = gdk_rgb_convert_888_lsb;
   else if (bpp == 24 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            ((mask_rgb && byte_order == GDK_MSB_FIRST) ||
             (mask_bgr && byte_order == GDK_LSB_FIRST)))
      conv = gdk_rgb_convert_888_msb;
#if G_BYTE_ORDER == G_BIG_ENDIAN
   else if (bpp == 32 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            (mask_rgb && byte_order == GDK_LSB_FIRST))
      conv = gdk_rgb_convert_0888_br;
   else if (bpp == 32 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            (mask_rgb && byte_order == GDK_MSB_FIRST))
      conv = gdk_rgb_convert_0888;
   else if (bpp == 32 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            (mask_bgr && byte_order == GDK_MSB_FIRST))
      conv = gdk_rgb_convert_8880_br;
#else
   else if (bpp == 32 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            (mask_rgb && byte_order == GDK_MSB_FIRST))
      conv = gdk_rgb_convert_0888_br;
   else if (bpp == 32 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            (mask_rgb && byte_order == GDK_LSB_FIRST))
      conv = gdk_rgb_convert_0888;
   else if (bpp == 32 && depth == 24 && vtype == GDK_VISUAL_TRUE_COLOR &&
            (mask_bgr && byte_order == GDK_LSB_FIRST))
      conv = gdk_rgb_convert_8880_br;
#endif

   else if (vtype == GDK_VISUAL_TRUE_COLOR && byte_order == GDK_LSB_FIRST) {
      conv = gdk_rgb_convert_truecolor_lsb;
      conv_d = gdk_rgb_convert_truecolor_lsb_d;
   } else if (vtype == GDK_VISUAL_TRUE_COLOR
              && byte_order == GDK_MSB_FIRST) {
      conv = gdk_rgb_convert_truecolor_msb;
      conv_d = gdk_rgb_convert_truecolor_msb_d;
   } else if (bpp == 8 && depth == 8 && (vtype == GDK_VISUAL_PSEUDO_COLOR
#ifdef ENABLE_GRAYSCALE
                                         || vtype == GDK_VISUAL_GRAYSCALE
#endif
              )) {
      image_info->dith_default = TRUE;
      conv = gdk_rgb_convert_8;
      if (vtype != GDK_VISUAL_GRAYSCALE) {
         if (image_info->nred_shades == 6 &&
             image_info->ngreen_shades == 6 &&
             image_info->nblue_shades == 6)
            conv_d = gdk_rgb_convert_8_d666;
         else
            conv_d = gdk_rgb_convert_8_d;
      }
      conv_indexed = gdk_rgb_convert_8_indexed;
      conv_gray = gdk_rgb_convert_gray_cmap;
   } else if (bpp == 8 && depth == 8 && (vtype == GDK_VISUAL_STATIC_GRAY
#ifdef not_ENABLE_GRAYSCALE
                                         || vtype == GDK_VISUAL_GRAYSCALE
#endif
              )) {
      conv = gdk_rgb_convert_gray8;
      conv_gray = gdk_rgb_convert_gray8_gray;
   } else if (bpp == 8 && depth < 8 && depth >= 2 &&
              (vtype == GDK_VISUAL_STATIC_GRAY
               || vtype == GDK_VISUAL_GRAYSCALE)) {
      conv = gdk_rgb_convert_gray4;
      conv_d = gdk_rgb_convert_gray4_d;
   } else if (bpp == 8 && depth < 8 && depth >= 3) {
      conv = gdk_rgb_convert_4;
   } else if (bpp == 4 && depth <= 4 && depth >= 2 &&
              (vtype == GDK_VISUAL_STATIC_GRAY
               || vtype == GDK_VISUAL_GRAYSCALE)) {
      conv = gdk_rgb_convert_gray4_pack;
      conv_d = gdk_rgb_convert_gray4_d_pack;
   }

   if (conv_d == NULL)
      conv_d = conv;

   image_info->conv = conv;
   image_info->conv_d = conv_d;

   image_info->conv_32 = conv_32;
   image_info->conv_32_d = conv_32_d;

   image_info->conv_gray = conv_gray;
   image_info->conv_gray_d = conv_gray_d;

   image_info->conv_indexed = conv_indexed;
   image_info->conv_indexed_d = conv_indexed_d;
}

static gint horiz_idx;
static gint horiz_y = IMAGE_HEIGHT;
static gint vert_idx;
static gint vert_x = IMAGE_WIDTH;
static gint tile_idx;
static gint tile_x = IMAGE_WIDTH;
static gint tile_y1 = IMAGE_HEIGHT;
static gint tile_y2 = IMAGE_HEIGHT;

#ifdef VERBOSE
static gint sincelast;
#endif

/* Defining NO_FLUSH can cause inconsistent screen updates, but is useful
   for performance evaluation. */

#undef NO_FLUSH

static gint gdk_rgb_alloc_scratch_image(void)
{
   if (static_image_idx == N_IMAGES) {
#ifndef NO_FLUSH
      gdk_flush();
#endif
#ifdef VERBOSE
      g_print("flush, %d puts since last flush\n", sincelast);
      sincelast = 0;
#endif
      static_image_idx = 0;
      horiz_y = IMAGE_HEIGHT;
      vert_x = IMAGE_WIDTH;
      tile_x = IMAGE_WIDTH;
      tile_y1 = tile_y2 = IMAGE_HEIGHT;
   }
   return static_image_idx++;
}

static GdkImage *gdk_rgb_alloc_scratch(gint width, gint height, gint * x0,
                                       gint * y0)
{
   GdkImage *image;
   gint idx;

   if (width >= (IMAGE_WIDTH >> 1)) {
      if (height >= (IMAGE_HEIGHT >> 1)) {
         idx = gdk_rgb_alloc_scratch_image();
         *x0 = 0;
         *y0 = 0;
      } else {
         if (height + horiz_y > IMAGE_HEIGHT) {
            horiz_idx = gdk_rgb_alloc_scratch_image();
            horiz_y = 0;
         }
         idx = horiz_idx;
         *x0 = 0;
         *y0 = horiz_y;
         horiz_y += height;
      }
   } else {
      if (height >= (IMAGE_HEIGHT >> 1)) {
         if (width + vert_x > IMAGE_WIDTH) {
            vert_idx = gdk_rgb_alloc_scratch_image();
            vert_x = 0;
         }
         idx = vert_idx;
         *x0 = vert_x;
         *y0 = 0;
         /* using 3 and -4 would be slightly more efficient on 32-bit machines
            with > 1bpp displays */
         vert_x += (width + 7) & -8;
      } else {
         if (width + tile_x > IMAGE_WIDTH) {
            tile_y1 = tile_y2;
            tile_x = 0;
         }
         if (height + tile_y1 > IMAGE_HEIGHT) {
            tile_idx = gdk_rgb_alloc_scratch_image();
            tile_x = 0;
            tile_y1 = 0;
            tile_y2 = 0;
         }
         if (height + tile_y1 > tile_y2)
            tile_y2 = height + tile_y1;
         idx = tile_idx;
         *x0 = tile_x;
         *y0 = tile_y1;
         tile_x += (width + 7) & -8;
      }
   }
   image = static_image[idx];
#ifdef VERBOSE
   g_print("index %d, x %d, y %d (%d x %d)\n", idx, *x0, *y0, width,
           height);
   sincelast++;
#endif
   return image;
}

static void
gdk_draw_rgb_image_core(GdkDrawable * drawable,
                        GdkGC * gc,
                        gint x,
                        gint y,
                        gint width,
                        gint height,
                        guchar * buf,
                        gint pixstride,
                        gint rowstride,
                        GdkRgbConvFunc conv,
                        GdkRgbCmap * cmap, gint xdith, gint ydith)
{
   gint y0, x0;
   gint xs0, ys0;
   GdkImage *image;
   gint width1, height1;
   guchar *buf_ptr;

   if (image_info->bitmap) {
      if (image_info->own_gc == NULL) {
         GdkColor color;

         image_info->own_gc = gdk_gc_new(drawable);
         gdk_color_white(image_info->cmap, &color);
         gdk_gc_set_foreground(image_info->own_gc, &color);
         gdk_color_black(image_info->cmap, &color);
         gdk_gc_set_background(image_info->own_gc, &color);
      }
      gc = image_info->own_gc;
   }
   for (y0 = 0; y0 < height; y0 += IMAGE_HEIGHT) {
      height1 = MIN(height - y0, IMAGE_HEIGHT);
      for (x0 = 0; x0 < width; x0 += IMAGE_WIDTH) {
         width1 = MIN(width - x0, IMAGE_WIDTH);
         buf_ptr = buf + y0 * rowstride + x0 * pixstride;

         image = gdk_rgb_alloc_scratch(width1, height1, &xs0, &ys0);

         conv(image, xs0, ys0, width1, height1, buf_ptr, rowstride,
              x + x0 + xdith, y + y0 + ydith, cmap);

#ifndef DONT_ACTUALLY_DRAW
         gdk_draw_image(drawable, gc,
                        image, xs0, ys0, x + x0, y + y0, width1, height1);
#endif
      }
   }
}


void
gdk_draw_rgb_image(GdkDrawable * drawable,
                   GdkGC * gc,
                   gint x,
                   gint y,
                   gint width,
                   gint height,
                   GdkRgbDither dith, guchar * rgb_buf, gint rowstride)
{
   if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
                                       !image_info->dith_default))
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, image_info->conv,
                              NULL, 0, 0);
   else
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, image_info->conv_d,
                              NULL, 0, 0);
}

void
gdk_draw_rgb_image_dithalign(GdkDrawable * drawable,
                             GdkGC * gc,
                             gint x,
                             gint y,
                             gint width,
                             gint height,
                             GdkRgbDither dith,
                             guchar * rgb_buf,
                             gint rowstride, gint xdith, gint ydith)
{
   if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
                                       !image_info->dith_default))
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, image_info->conv,
                              NULL, xdith, ydith);
   else
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              rgb_buf, 3, rowstride, image_info->conv_d,
                              NULL, xdith, ydith);
}

void
gdk_draw_rgb_32_image(GdkDrawable * drawable,
                      GdkGC * gc,
                      gint x,
                      gint y,
                      gint width,
                      gint height,
                      GdkRgbDither dith, guchar * buf, gint rowstride)
{
   if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
                                       !image_info->dith_default))
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              buf, 4, rowstride,
                              image_info->conv_32, NULL, 0, 0);
   else
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              buf, 4, rowstride,
                              image_info->conv_32_d, NULL, 0, 0);
}

static void gdk_rgb_make_gray_cmap(GdkRgbInfo * info)
{
   guint32 rgb[256];
   gint i;

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

void
gdk_draw_gray_image(GdkDrawable * drawable,
                    GdkGC * gc,
                    gint x,
                    gint y,
                    gint width,
                    gint height,
                    GdkRgbDither dith, guchar * buf, gint rowstride)
{
   if (image_info->bpp == 1 &&
       image_info->gray_cmap == NULL &&
       (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR ||
        image_info->visual->type == GDK_VISUAL_GRAYSCALE))
      gdk_rgb_make_gray_cmap(image_info);

   if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
                                       !image_info->dith_default))
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              buf, 1, rowstride,
                              image_info->conv_gray, NULL, 0, 0);
   else
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              buf, 1, rowstride,
                              image_info->conv_gray_d, NULL, 0, 0);
}

GdkRgbCmap *gdk_rgb_cmap_new(guint32 * colors, gint n_colors)
{
   GdkRgbCmap *cmap;
   int i, j;
   guint32 rgb;

   g_return_val_if_fail(n_colors >= 0, NULL);
   g_return_val_if_fail(n_colors <= 256, NULL);
   cmap = g_new(GdkRgbCmap, 1);
   memcpy(cmap->colors, colors, n_colors * sizeof(guint32));
   if (image_info->bpp == 1 &&
       (image_info->visual->type == GDK_VISUAL_PSEUDO_COLOR ||
        image_info->visual->type == GDK_VISUAL_GRAYSCALE))
      for (i = 0; i < n_colors; i++) {
         rgb = colors[i];
         j = ((rgb & 0xf00000) >> 12) |
             ((rgb & 0xf000) >> 8) | ((rgb & 0xf0) >> 4);
#ifdef VERBOSE
         g_print("%d %x %x %d\n", i, j, colorcube[j]);
#endif
         cmap->lut[i] = colorcube[j];
      }
   return cmap;
}

void gdk_rgb_cmap_free(GdkRgbCmap * cmap)
{
   g_free(cmap);
}

void
gdk_draw_indexed_image(GdkDrawable * drawable,
                       GdkGC * gc,
                       gint x,
                       gint y,
                       gint width,
                       gint height,
                       GdkRgbDither dith,
                       guchar * buf, gint rowstride, GdkRgbCmap * cmap)
{
   if (dith == GDK_RGB_DITHER_NONE || (dith == GDK_RGB_DITHER_NORMAL &&
                                       !image_info->dith_default))
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              buf, 1, rowstride,
                              image_info->conv_indexed, cmap, 0, 0);
   else
      gdk_draw_rgb_image_core(drawable, gc, x, y, width, height,
                              buf, 1, rowstride,
                              image_info->conv_indexed_d, cmap, 0, 0);
}

gboolean gdk_rgb_ditherable(void)
{
   return (image_info->conv != image_info->conv_d);
}

GdkColormap *gdk_rgb_get_cmap(void)
{
   gdk_rgb_init();
   return image_info->cmap;
}

GdkVisual *gdk_rgb_get_visual(void)
{
   gdk_rgb_init();
   return image_info->visual;
}

---