gdkcolor.c 28.7 KB
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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
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 */
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#include <time.h>
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#include <X11/Xlib.h>
#include "gdk.h"
#include "gdkprivate.h"
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#include "gdkx.h"
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static gint  gdk_colormap_match_color (GdkColormap *cmap,
				       GdkColor    *color,
				       const gchar *available);
static void  gdk_colormap_add         (GdkColormap *cmap);
static void  gdk_colormap_remove      (GdkColormap *cmap);
static guint gdk_colormap_hash        (Colormap    *cmap);
static gint  gdk_colormap_cmp         (Colormap    *a,
				       Colormap    *b);
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static void gdk_colormap_real_destroy (GdkColormap *colormap);
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static GHashTable *colormap_hash = NULL;


GdkColormap*
gdk_colormap_new (GdkVisual *visual,
		  gint       private_cmap)
{
  GdkColormap *colormap;
  GdkColormapPrivate *private;
  Visual *xvisual;
  int size;
  int i;

  g_return_val_if_fail (visual != NULL, NULL);

  private = g_new (GdkColormapPrivate, 1);
  colormap = (GdkColormap*) private;

  private->xdisplay = gdk_display;
  private->visual = visual;
  private->ref_count = 1;
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  private->hash = NULL;
  private->last_sync_time = 0;
  private->info = NULL;
  
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  xvisual = ((GdkVisualPrivate*) visual)->xvisual;

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  colormap->size = visual->colormap_size;
  colormap->colors = g_new (GdkColor, colormap->size);

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  switch (visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
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      private->info = g_new0 (GdkColorInfo, colormap->size);
      colormap->colors = g_new (GdkColor, colormap->size);
      
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      private->hash = g_hash_table_new ((GHashFunc) gdk_color_hash,
					(GCompareFunc) gdk_color_equal);
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      private->private_val = private_cmap;
      private->xcolormap = XCreateColormap (private->xdisplay, gdk_root_window,
					    xvisual, (private_cmap) ? (AllocAll) : (AllocNone));

      if (private_cmap)
	{
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	  XColor *default_colors;

	  default_colors = g_new (XColor, colormap->size);

	  for (i = 0; i < colormap->size; i++)
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	    default_colors[i].pixel = i;

	  XQueryColors (private->xdisplay,
			DefaultColormap (private->xdisplay, gdk_screen),
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			default_colors, colormap->size);
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	  for (i = 0; i < colormap->size; i++)
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	    {
	      colormap->colors[i].pixel = default_colors[i].pixel;
	      colormap->colors[i].red = default_colors[i].red;
	      colormap->colors[i].green = default_colors[i].green;
	      colormap->colors[i].blue = default_colors[i].blue;
	    }

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	  gdk_colormap_change (colormap, colormap->size);
	  
	  g_free (default_colors);
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	}
      break;

    case GDK_VISUAL_DIRECT_COLOR:
      private->private_val = TRUE;
      private->xcolormap = XCreateColormap (private->xdisplay, gdk_root_window,
					    xvisual, AllocAll);

      size = 1 << visual->red_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].red = i * 65535 / (size - 1);

      size = 1 << visual->green_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].green = i * 65535 / (size - 1);

      size = 1 << visual->blue_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].blue = i * 65535 / (size - 1);

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      gdk_colormap_change (colormap, colormap->size);
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      break;

    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
    case GDK_VISUAL_TRUE_COLOR:
      private->private_val = FALSE;
      private->xcolormap = XCreateColormap (private->xdisplay, gdk_root_window,
					    xvisual, AllocNone);
      break;
    }

  gdk_colormap_add (colormap);

  return colormap;
}

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static void
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gdk_colormap_real_destroy (GdkColormap *colormap)
{
  GdkColormapPrivate *private = (GdkColormapPrivate*) colormap;

  g_return_if_fail (colormap != NULL);
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  g_return_if_fail (private->ref_count == 0);
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  gdk_colormap_remove (colormap);
  XFreeColormap (private->xdisplay, private->xcolormap);
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  if (private->hash)
    g_hash_table_destroy (private->hash);
  
  g_free (private->info);
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  g_free (colormap->colors);
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  g_free (colormap);
}

GdkColormap*
gdk_colormap_ref (GdkColormap *cmap)
{
  GdkColormapPrivate *private = (GdkColormapPrivate *)cmap;
  g_return_val_if_fail (cmap != NULL, NULL);

  private->ref_count += 1;
  return cmap;
}

void
gdk_colormap_unref (GdkColormap *cmap)
{
  GdkColormapPrivate *private = (GdkColormapPrivate *)cmap;
  g_return_if_fail (cmap != NULL);

  private->ref_count -= 1;
  if (private->ref_count == 0)
    gdk_colormap_real_destroy (cmap);
}

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GdkVisual *
gdk_colormap_get_visual (GdkColormap *colormap)
{
  GdkColormapPrivate *private;

  g_return_val_if_fail (colormap != NULL, NULL);
  
  private = (GdkColormapPrivate *)colormap;

  return private->visual;
}
     
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#define MIN_SYNC_TIME 2

void
gdk_colormap_sync (GdkColormap *colormap,
		   gboolean     force)
{
  time_t current_time;
  GdkColormapPrivate *private = (GdkColormapPrivate *)colormap;
  XColor *xpalette;
  gint nlookup;
  gint i;
  
  g_return_if_fail (colormap != NULL);

  current_time = time (NULL);
  if (!force && ((current_time - private->last_sync_time) < MIN_SYNC_TIME))
    return;

  private->last_sync_time = current_time;

  nlookup = 0;
  xpalette = g_new (XColor, colormap->size);
  
  for (i = 0; i < colormap->size; i++)
    {
      if (private->info[i].ref_count == 0)
	{
	  xpalette[nlookup].pixel = i;
	  xpalette[nlookup].red = 0;
	  xpalette[nlookup].green = 0;
	  xpalette[nlookup].blue = 0;
	  nlookup++;
	}
    }
  
  XQueryColors (gdk_display, private->xcolormap, xpalette, nlookup);
  
  for (i = 0; i < nlookup; i++)
    {
      gulong pixel = xpalette[i].pixel;
      colormap->colors[pixel].pixel = pixel;
      colormap->colors[pixel].red = xpalette[i].red;
      colormap->colors[pixel].green = xpalette[i].green;
      colormap->colors[pixel].blue = xpalette[i].blue;
    }
  
  g_free (xpalette);
}
		   

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GdkColormap*
gdk_colormap_get_system (void)
{
  static GdkColormap *colormap = NULL;
  GdkColormapPrivate *private;

  if (!colormap)
    {
      private = g_new (GdkColormapPrivate, 1);
      colormap = (GdkColormap*) private;

      private->xdisplay = gdk_display;
      private->xcolormap = DefaultColormap (gdk_display, gdk_screen);
      private->visual = gdk_visual_get_system ();
      private->private_val = FALSE;
      private->ref_count = 1;

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      private->hash = NULL;
      private->last_sync_time = 0;
      private->info = NULL;

      colormap->colors = NULL;
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      colormap->size = private->visual->colormap_size;

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      if ((private->visual->type == GDK_VISUAL_GRAYSCALE) ||
	  (private->visual->type == GDK_VISUAL_PSEUDO_COLOR))
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	{
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	  private->info = g_new0 (GdkColorInfo, colormap->size);
	  colormap->colors = g_new (GdkColor, colormap->size);
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	  private->hash = g_hash_table_new ((GHashFunc) gdk_color_hash,
					    (GCompareFunc) gdk_color_equal);
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	  gdk_colormap_sync (colormap, TRUE);
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	}

      gdk_colormap_add (colormap);
    }

  return colormap;
}

gint
gdk_colormap_get_system_size (void)
{
  return DisplayCells (gdk_display, gdk_screen);
}

void
gdk_colormap_change (GdkColormap *colormap,
		     gint         ncolors)
{
  GdkColormapPrivate *private;
  GdkVisual *visual;
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  XColor *palette;
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  gint shift;
  int max_colors;
  int size;
  int i;

  g_return_if_fail (colormap != NULL);

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  palette = g_new (XColor, ncolors);

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  private = (GdkColormapPrivate*) colormap;
  switch (private->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      for (i = 0; i < ncolors; i++)
	{
	  palette[i].pixel = colormap->colors[i].pixel;
	  palette[i].red = colormap->colors[i].red;
	  palette[i].green = colormap->colors[i].green;
	  palette[i].blue = colormap->colors[i].blue;
	  palette[i].flags = DoRed | DoGreen | DoBlue;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, ncolors);
      break;

    case GDK_VISUAL_DIRECT_COLOR:
      visual = private->visual;

      shift = visual->red_shift;
      max_colors = 1 << visual->red_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].red = colormap->colors[i].red;
	  palette[i].flags = DoRed;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, size);

      shift = visual->green_shift;
      max_colors = 1 << visual->green_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].green = colormap->colors[i].green;
	  palette[i].flags = DoGreen;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, size);

      shift = visual->blue_shift;
      max_colors = 1 << visual->blue_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].blue = colormap->colors[i].blue;
	  palette[i].flags = DoBlue;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, size);
      break;

    default:
      break;
    }
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  g_free (palette);
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}

void
gdk_colors_store (GdkColormap   *colormap,
		  GdkColor      *colors,
		  gint           ncolors)
{
  gint i;

  for (i = 0; i < ncolors; i++)
    {
      colormap->colors[i].pixel = colors[i].pixel;
      colormap->colors[i].red = colors[i].red;
      colormap->colors[i].green = colors[i].green;
      colormap->colors[i].blue = colors[i].blue;
    }

  gdk_colormap_change (colormap, ncolors);
}

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gboolean
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gdk_colors_alloc (GdkColormap   *colormap,
		  gint           contiguous,
		  gulong        *planes,
		  gint           nplanes,
		  gulong        *pixels,
		  gint           npixels)
{
  GdkColormapPrivate *private;
  gint return_val;
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  gint i;
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  g_return_val_if_fail (colormap != NULL, 0);

  private = (GdkColormapPrivate*) colormap;

  return_val = XAllocColorCells (private->xdisplay, private->xcolormap,
				 contiguous, planes, nplanes, pixels, npixels);

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  if (return_val)
    {
      for (i=0; i<npixels; i++)
	{
	  private->info[pixels[i]].ref_count++;
	  private->info[pixels[i]].flags |= GDK_COLOR_WRITEABLE;
	}
    }

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  return return_val;
}

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/* This is almost identical to gdk_colormap_free_colors.
 * Keep them in sync!
 */
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void
gdk_colors_free (GdkColormap *colormap,
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		 gulong      *in_pixels,
		 gint         in_npixels,
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		 gulong       planes)
{
  GdkColormapPrivate *private;
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  gulong *pixels;
  gint npixels = 0;
  gint i;
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  g_return_if_fail (colormap != NULL);
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  g_return_if_fail (in_pixels != NULL);
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  private = (GdkColormapPrivate*) colormap;

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  if ((private->visual->type != GDK_VISUAL_PSEUDO_COLOR) &&
      (private->visual->type != GDK_VISUAL_GRAYSCALE))
    return;
  
  pixels = g_new (gulong, in_npixels);

  for (i=0; i<in_npixels; i++)
    {
      gulong pixel = in_pixels[i];
      
      if (private->info[pixel].ref_count)
	{
	  private->info[pixel].ref_count--;

	  if (private->info[pixel].ref_count == 0)
	    {
	      pixels[npixels++] = pixel;
	      if (!(private->info[pixel].flags & GDK_COLOR_WRITEABLE))
		g_hash_table_remove (private->hash, &colormap->colors[in_pixels[i]]);
	      private->info[pixel].flags = 0;
	    }
	}
    }

  if (npixels)
    XFreeColors (private->xdisplay, private->xcolormap,
		 pixels, npixels, planes);
  g_free (pixels);
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}

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/*
 *--------------------------------------------------------------
 * gdk_color_copy
 *
 *   Copy a color structure into new storage.
 *
 * Arguments:
 *   "color" is the color struct to copy.
 *
 * Results:
 *   A new color structure.  Free it with gdk_color_free.
 *
 *--------------------------------------------------------------
 */

static GMemChunk *color_chunk;

GdkColor*
gdk_color_copy (GdkColor *color)
{
  GdkColor *new_color;
  
  g_return_val_if_fail (color != NULL, NULL);

  if (color_chunk == NULL)
    color_chunk = g_mem_chunk_new ("colors",
				   sizeof (GdkColor),
				   4096,
				   G_ALLOC_AND_FREE);

  new_color = g_chunk_new (GdkColor, color_chunk);
  *new_color = *color;
  return new_color;
}

/*
 *--------------------------------------------------------------
 * gdk_color_free
 *
 *   Free a color structure obtained from gdk_color_copy.  Do not use
 *   with other color structures.
 *
 * Arguments:
 *   "color" is the color struct to free.
 *
 *-------------------------------------------------------------- */

void
gdk_color_free (GdkColor *color)
{
  g_assert (color_chunk != NULL);
  g_return_if_fail (color != NULL);

  g_mem_chunk_free (color_chunk, color);
}

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gint
gdk_color_white (GdkColormap *colormap,
		 GdkColor    *color)
{
  gint return_val;

  g_return_val_if_fail (colormap != NULL, FALSE);

  if (color)
    {
      color->pixel = WhitePixel (gdk_display, gdk_screen);
      color->red = 65535;
      color->green = 65535;
      color->blue = 65535;

      return_val = gdk_color_alloc (colormap, color);
    }
  else
    return_val = FALSE;

  return return_val;
}

gint
gdk_color_black (GdkColormap *colormap,
		 GdkColor    *color)
{
  gint return_val;

  g_return_val_if_fail (colormap != NULL, FALSE);

  if (color)
    {
      color->pixel = BlackPixel (gdk_display, gdk_screen);
      color->red = 0;
      color->green = 0;
      color->blue = 0;

      return_val = gdk_color_alloc (colormap, color);
    }
  else
    return_val = FALSE;

  return return_val;
}

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gboolean
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gdk_color_parse (const gchar *spec,
		 GdkColor *color)
{
  Colormap xcolormap;
  XColor xcolor;
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  gboolean return_val;
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  g_return_val_if_fail (spec != NULL, FALSE);
  g_return_val_if_fail (color != NULL, FALSE);

  xcolormap = DefaultColormap (gdk_display, gdk_screen);

  if (XParseColor (gdk_display, xcolormap, spec, &xcolor))
    {
      return_val = TRUE;
      color->red = xcolor.red;
      color->green = xcolor.green;
      color->blue = xcolor.blue;
    }
  else
    return_val = FALSE;

  return return_val;
}

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/********************
 * Color allocation *
 ********************/

/* Try to allocate a single color using XAllocColor. If it succeeds,
 * cache the result in our colormap, and store in ret.
 */
static gboolean 
gdk_colormap_alloc1 (GdkColormap *colormap,
		     GdkColor    *color,
		     GdkColor    *ret)
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{
  GdkColormapPrivate *private;
  XColor xcolor;

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  private = (GdkColormapPrivate*) colormap;
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  xcolor.red = color->red;
  xcolor.green = color->green;
  xcolor.blue = color->blue;
  xcolor.pixel = color->pixel;
  xcolor.flags = DoRed | DoGreen | DoBlue;

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  if (XAllocColor (private->xdisplay, private->xcolormap, &xcolor))
    {
      ret->pixel = xcolor.pixel;
      ret->red = xcolor.red;
      ret->green = xcolor.green;
      ret->blue = xcolor.blue;
      
      if (ret->pixel < colormap->size)
	{
	  if (private->info[ret->pixel].ref_count) /* got a duplicate */
	    {
	      XFreeColors (private->xdisplay, private->xcolormap,
			   &ret->pixel, 1, 0);
	    }
	  else
	    {
	      colormap->colors[ret->pixel] = *color;
	      private->info[ret->pixel].ref_count = 1;

	      g_hash_table_insert (private->hash,
				   &colormap->colors[ret->pixel],
				   &colormap->colors[ret->pixel]);
	    }
	}
      return TRUE;
    }
  else
    {
      return FALSE;
    }
}

static gint
gdk_colormap_alloc_colors_writeable (GdkColormap *colormap,
				     GdkColor    *colors,
				     gint         ncolors,
				     gboolean     writeable,
				     gboolean     best_match,
				     gboolean    *success)
{
  GdkColormapPrivate *private;
  gulong *pixels;
  Status status;
  gint i, index;

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  private = (GdkColormapPrivate*) colormap;

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  if (private->private_val)
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    {
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      index = 0;
      for (i=0; i<ncolors; i++)
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	{
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	  while ((index < colormap->size) && (private->info[index].ref_count != 0))
	    index++;
	  
	  if (index < colormap->size)
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	    {
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	      colors[i].pixel = index;
	      success[i] = TRUE;
	      private->info[index].ref_count++;
	      private->info[i].flags |= GDK_COLOR_WRITEABLE;
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	    }
	  else
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	    break;
	}
      return i;
    }
  else
    {
      pixels = g_new (gulong, ncolors);
      /* Allocation of a writeable color cells */
      
      status =  XAllocColorCells (private->xdisplay, private->xcolormap,
				  FALSE, NULL, 0, pixels, ncolors);
      if (status)
	{
	  for (i=0; i<ncolors; i++)
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	    {
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	      colors[i].pixel = pixels[i];
	      private->info[pixels[i]].ref_count++;
	      private->info[pixels[i]].flags |= GDK_COLOR_WRITEABLE;
	    }
	}
      
      g_free (pixels);

      return status ? ncolors : 0; 
    }
}
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static gint
gdk_colormap_alloc_colors_private (GdkColormap *colormap,
				   GdkColor    *colors,
				   gint         ncolors,
				   gboolean     writeable,
				   gboolean     best_match,
				   gboolean    *success)
{
  GdkColormapPrivate *private;
  gint i, index;
  XColor *store = g_new (XColor, ncolors);
  gint nstore = 0;
  gint nremaining = 0;
  
  private = (GdkColormapPrivate*) colormap;
  index = -1;

  /* First, store the colors we have room for */

  index = 0;
  for (i=0; i<ncolors; i++)
    {
      if (!success[i])
	{
	  while ((index < colormap->size) && (private->info[index].ref_count != 0))
	    index++;

	  if (index < colormap->size)
	    {
	      store[nstore].red = colors[i].red;
	      store[nstore].blue = colors[i].blue;
	      store[nstore].green = colors[i].green;
	      store[nstore].pixel = index;
	      nstore++;

	      success[i] = TRUE;

	      colors[i].pixel = index;
	      private->info[index].ref_count++;
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	    }
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	  else
	    nremaining++;
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	}
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    }
  
  XStoreColors (private->xdisplay, private->xcolormap, store, nstore);
  g_free (store);

  if (nremaining > 0 && best_match)
    {
      /* Get best matches for remaining colors */

      gchar *available = g_new (gchar, colormap->size);
      for (i = 0; i < colormap->size; i++)
	available[i] = TRUE;

      for (i=0; i<ncolors; i++)
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	{
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	  if (!success[i])
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	    {
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	      index = gdk_colormap_match_color (colormap, 
						&colors[i], 
						available);
	      if (index != -1)
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		{
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		  colors[i] = colormap->colors[index];
		  private->info[index].ref_count++;
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		  success[i] = TRUE;
		  nremaining--;
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		}
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	    }
	}
      g_free (available);
    }

  return (ncolors - nremaining);
}

static gint
gdk_colormap_alloc_colors_shared (GdkColormap *colormap,
				  GdkColor    *colors,
				  gint         ncolors,
				  gboolean     writeable,
				  gboolean     best_match,
				  gboolean    *success)
{
  GdkColormapPrivate *private;
  gint i, index;
  gint nremaining = 0;
  gint nfailed = 0;

  private = (GdkColormapPrivate*) colormap;
  index = -1;
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  for (i=0; i<ncolors; i++)
    {
      if (!success[i])
	{
	  if (gdk_colormap_alloc1 (colormap, &colors[i], &colors[i]))
	    success[i] = TRUE;
	  else
	    nremaining++;
	}
    }


  if (nremaining > 0 && best_match)
    {
      gchar *available = g_new (gchar, colormap->size);
      for (i = 0; i < colormap->size; i++)
	available[i] = ((private->info[i].ref_count == 0) ||
			!(private->info[i].flags && GDK_COLOR_WRITEABLE));
      gdk_colormap_sync (colormap, FALSE);
      
      while (nremaining > 0)
	{
	  for (i=0; i<ncolors; i++)
	    {
	      if (!success[i])
		{
		  index = gdk_colormap_match_color (colormap, &colors[i], available);
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		  if (index != -1)
		    {
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		      if (private->info[index].ref_count)
			{
			  private->info[index].ref_count++;
			  colors[i] = colormap->colors[index];
			  success[i] = TRUE;
			  nremaining--;
			}
		      else
			{
			  if (gdk_colormap_alloc1 (colormap, 
						   &colormap->colors[index],
						   &colors[i]))
			    {
			      success[i] = TRUE;
			      nremaining--;
			      break;
			    }
			  else
			    {
			      available[index] = FALSE;
			    }
			}
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		    }
		  else
		    {
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		      nfailed++;
		      nremaining--;
		      success[i] = 2; /* flag as permanent failure */
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		    }
		}
	    }
	}
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      g_free (available);
    }

  /* Change back the values we flagged as permanent failures */
  if (nfailed > 0)
    {
      for (i=0; i<ncolors; i++)
	if (success[i] == 2)
	  success[i] = FALSE;
      nremaining = nfailed;
    }
  
  return (ncolors - nremaining);
}

static gint
gdk_colormap_alloc_colors_pseudocolor (GdkColormap *colormap,
				       GdkColor    *colors,
				       gint         ncolors,
				       gboolean     writeable,
				       gboolean     best_match,
				       gboolean    *success)
{
  GdkColormapPrivate *private;
  GdkColor *lookup_color;
  gint i;
  gint nremaining = 0;

  private = (GdkColormapPrivate*) colormap;

  /* Check for an exact match among previously allocated colors */

  for (i=0; i<ncolors; i++)
    {
      if (!success[i])
	{
	  lookup_color = g_hash_table_lookup (private->hash, &colors[i]);
	  if (lookup_color)
	    {
	      private->info[lookup_color->pixel].ref_count++;
	      colors[i].pixel = lookup_color->pixel;
	      success[i] = TRUE;
	    }
	  else
	    nremaining++;
	}
    }

  /* If that failed, we try to allocate a new color, or approxmiate
   * with what we can get if best_match is TRUE.
   */
  if (nremaining > 0)
    {
      if (private->private_val)
	return gdk_colormap_alloc_colors_private (colormap, colors, ncolors, writeable, best_match, success);
      else
	return gdk_colormap_alloc_colors_shared (colormap, colors, ncolors, writeable, best_match, success);
    }
  else
    return 0;
}

gint
gdk_colormap_alloc_colors (GdkColormap *colormap,
			   GdkColor    *colors,
			   gint         ncolors,
			   gboolean     writeable,
			   gboolean     best_match,
			   gboolean    *success)
{
  GdkColormapPrivate *private;
  GdkVisual *visual;
  gint i;
  gint nremaining = 0;
  XColor xcolor;

  g_return_val_if_fail (colormap != NULL, FALSE);
  g_return_val_if_fail (colors != NULL, FALSE);

  private = (GdkColormapPrivate*) colormap;

  for (i=0; i<ncolors; i++)
    {
      success[i] = FALSE;
    }

  switch (private->visual->type)
    {
    case GDK_VISUAL_PSEUDO_COLOR:
    case GDK_VISUAL_GRAYSCALE:
      if (writeable)
	return gdk_colormap_alloc_colors_writeable (colormap, colors, ncolors,
						    writeable, best_match, success);
      else
	return gdk_colormap_alloc_colors_pseudocolor (colormap, colors, ncolors,
						    writeable, best_match, success);
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      break;

    case GDK_VISUAL_DIRECT_COLOR:
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    case GDK_VISUAL_TRUE_COLOR:
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      visual = private->visual;
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      for (i=0; i<ncolors; i++)
	{
	  colors[i].pixel = (((colors[i].red >> (16 - visual->red_prec)) << visual->red_shift) +
			     ((colors[i].green >> (16 - visual->green_prec)) << visual->green_shift) +
			     ((colors[i].blue >> (16 - visual->blue_prec)) << visual->blue_shift));
	  success[i] = TRUE;
	}
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      break;

    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
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      for (i=0; i<ncolors; i++)
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	{
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	  xcolor.red = colors[i].red;
	  xcolor.green = colors[i].green;
	  xcolor.blue = colors[i].blue;
	  xcolor.pixel = colors[i].pixel;
	  xcolor.flags = DoRed | DoGreen | DoBlue;

	  if (XAllocColor (private->xdisplay, private->xcolormap, &xcolor))
	    {
	      colors[i].pixel = xcolor.pixel;
	      success[i] = TRUE;
	    }
	  else
	    nremaining++;
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	}
      break;
    }