gtk/gdk/win32/gdkpixmap-win32.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 * Copyright (C) 1998-1999 Tor Lillqvist
 *
 * 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.
 */

/*
 * 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 "config.h"

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

#include "gdkpixmap.h"
#include "gdkinternals.h"
#include "gdkprivate-win32.h"

typedef struct
{
  gchar *color_string;
  GdkColor color;
  gint transparent;
} _GdkPixmapColor;

typedef struct
{
  guint ncolors;
  GdkColormap *colormap;
  gulong pixels[1];
} _GdkPixmapInfo;

static void
gdk_win32_pixmap_destroy (GdkPixmap *pixmap)
{
  GdkDrawablePrivate *private = (GdkDrawablePrivate *) pixmap;

  GDK_NOTE (MISC, g_print ("gdk_win32_pixmap_destroy: %#x\n",
			   GDK_DRAWABLE_XID (pixmap)));

  if (!DeleteObject (GDK_DRAWABLE_XID (pixmap)))
    WIN32_GDI_FAILED ("DeleteObject");

  gdk_xid_table_remove (GDK_DRAWABLE_XID (pixmap));

  g_free (GDK_DRAWABLE_WIN32DATA (pixmap));
}

static GdkDrawable *
gdk_win32_pixmap_alloc (void)
{
  GdkDrawable *drawable;
  GdkDrawablePrivate *private;
  
  static GdkDrawableClass klass;
  static gboolean initialized = FALSE;

  if (!initialized)
    {
      initialized = TRUE;
      
      klass = _gdk_win32_drawable_class;
      klass.destroy = gdk_win32_pixmap_destroy;
    }

  drawable = gdk_drawable_alloc ();
  private = (GdkDrawablePrivate *) drawable;

  private->klass = &klass;
  private->klass_data = g_new (GdkDrawableWin32Data, 1);
  private->window_type = GDK_DRAWABLE_PIXMAP;

  return drawable;
}

GdkPixmap*
gdk_pixmap_new (GdkWindow *window,
		gint       width,
		gint       height,
		gint       depth)
{
  GdkPixmap *pixmap;
  GdkDrawablePrivate *private;
  struct {
    BITMAPINFOHEADER bmiHeader;
    union {
      WORD bmiIndices[256];
      DWORD bmiMasks[3];
      RGBQUAD bmiColors[256];
    } u;
  } bmi;
  UINT iUsage;
  HDC hdc;
  GdkVisual *visual;
  guchar *bits;
  gint i;

  g_return_val_if_fail (window == NULL || GDK_IS_WINDOW (window), NULL);
  g_return_val_if_fail ((window != NULL) || (depth != -1), NULL);
#if 1
  g_return_val_if_fail ((width != 0) && (height != 0), NULL);
#else
  /* HB: Not The Right Thing to do, but a nice way to debug
   * the backing store facility without immediate crashes ...
   */
  if (width == 0 || height == 0)
    {
      g_warning("gdk_pixmap_new: size requested: %ld %ld", width, height);
      /* testing: where does it crash next? */
      if (width == 0) width = 1;
      if (height == 0) height = 1;
    }
#endif

  if (!window)
    window = gdk_parent_root;

  if (GDK_DRAWABLE_DESTROYED (window))
    return NULL;

  if (depth == -1)
    depth = gdk_drawable_get_visual (window)->depth;

  GDK_NOTE (MISC, g_print ("gdk_pixmap_new: %dx%dx%d\n",
			   width, height, depth));

  pixmap = gdk_win32_pixmap_alloc ();
  private = (GdkDrawablePrivate *) pixmap;

  visual = gdk_drawable_get_visual (window);

  if ((hdc = GetDC (GDK_DRAWABLE_XID (window))) == NULL)
    {
      WIN32_GDI_FAILED ("GetDC");
      g_free (private);
      return NULL;
    }

  bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
  bmi.bmiHeader.biWidth = width;
  bmi.bmiHeader.biHeight = -height;
  bmi.bmiHeader.biPlanes = 1;
  if (depth == 15)
    bmi.bmiHeader.biBitCount = 16;
  else
    bmi.bmiHeader.biBitCount = depth;
#if 1
  if (depth == 16)
    bmi.bmiHeader.biCompression = BI_BITFIELDS;
  else
#endif
    bmi.bmiHeader.biCompression = BI_RGB;
  bmi.bmiHeader.biSizeImage = 0;
  bmi.bmiHeader.biXPelsPerMeter =
    bmi.bmiHeader.biYPelsPerMeter = 0;
  bmi.bmiHeader.biClrUsed = 0;
  bmi.bmiHeader.biClrImportant = 0;

  iUsage = DIB_RGB_COLORS;
  if (depth == 1)
    {
      bmi.u.bmiColors[0].rgbBlue =
	bmi.u.bmiColors[0].rgbGreen =
	bmi.u.bmiColors[0].rgbRed = 0x00;
      bmi.u.bmiColors[0].rgbReserved = 0x00;

      bmi.u.bmiColors[1].rgbBlue =
	bmi.u.bmiColors[1].rgbGreen =
	bmi.u.bmiColors[1].rgbRed = 0xFF;
      bmi.u.bmiColors[1].rgbReserved = 0x00;
      private->colormap = NULL;
    }
  else
    {
      private->colormap = ((GdkWindowPrivate *) window)->drawable.colormap;
      if (private->colormap == NULL)
	private->colormap = gdk_colormap_get_system ();

      if (depth == 8)
	{
	  iUsage = DIB_PAL_COLORS;
	  for (i = 0; i < 256; i++)
	    bmi.u.bmiIndices[i] = i;
	}
      else
	{
	  if (depth != visual->depth)
	    g_warning ("gdk_pixmap_new: depth %d doesn't match display depth %d",
		       depth, visual->depth);
#if 1
	  if (depth == 16)
	    {
	      bmi.u.bmiMasks[0] = visual->red_mask;
	      bmi.u.bmiMasks[1] = visual->green_mask;
	      bmi.u.bmiMasks[2] = visual->blue_mask;
	    }
#endif
	}
    }
  if ((GDK_DRAWABLE_WIN32DATA (pixmap)->xid =
       CreateDIBSection (hdc, (BITMAPINFO *) &bmi,
			 iUsage, (PVOID *) &bits, NULL, 0)) == NULL)
    {
      WIN32_GDI_FAILED ("CreateDIBSection");
      ReleaseDC (GDK_DRAWABLE_XID (window), hdc);
      g_free (pixmap);
      return NULL;
    }
  ReleaseDC (GDK_DRAWABLE_XID (window), hdc);

  GDK_NOTE (MISC, g_print ("... = %#x\n", GDK_DRAWABLE_XID (pixmap)));

  private->width = width;
  private->height = height;

  gdk_xid_table_insert (&GDK_DRAWABLE_XID (pixmap), pixmap);

  return pixmap;
}

GdkPixmap *
gdk_pixmap_create_on_shared_image (GdkImage **image_return,
				   GdkWindow *window,
				   GdkVisual *visual,
				   gint       width,
				   gint       height,
				   gint       depth)
{
  GdkPixmap *pixmap;
  GdkDrawablePrivate *private;

  g_return_val_if_fail (window != NULL, NULL);


  if (depth == 1)
    *image_return = gdk_image_bitmap_new (GDK_IMAGE_SHARED_PIXMAP, visual, width, height);
  else
    {
      g_return_val_if_fail (depth == visual->depth, NULL);
      *image_return = gdk_image_new (GDK_IMAGE_SHARED_PIXMAP, visual, width, height);
    }

  g_return_val_if_fail (*image_return != NULL, NULL);

  pixmap = gdk_win32_pixmap_alloc ();
  private = (GdkDrawablePrivate *) pixmap;

  GDK_DRAWABLE_WIN32DATA (pixmap)->xid =
    ((GdkImagePrivateWin32 *) *image_return)->ximage;
  private->colormap = ((GdkWindowPrivate *) window)->drawable.colormap;
  private->width = width;
  private->height = height;

  gdk_xid_table_insert (&GDK_DRAWABLE_XID (pixmap), pixmap);

  GDK_NOTE (MISC,
	    g_print ("gdk_pixmap_create_on_shared_image: %dx%dx%d = %#x\n",
		     width, height, depth, GDK_DRAWABLE_XID (pixmap)));

  return pixmap;
}

static unsigned char mirror[256] = {
  0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
  0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
  0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
  0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
  0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
  0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
  0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
  0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
  0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
  0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
  0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
  0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
  0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
  0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
  0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
  0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
  0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
  0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
  0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
  0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
  0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
  0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
  0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
  0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
  0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
  0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
  0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
  0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
  0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
  0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
  0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
  0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};

GdkPixmap *
gdk_bitmap_create_from_data (GdkWindow   *window,
			     const gchar *data,
			     gint         width,
			     gint         height)
{
  GdkPixmap *pixmap;
  GdkDrawablePrivate *private;
  gint i, j, bpl, aligned_bpl;
  guchar *bits;

  g_return_val_if_fail (data != NULL, NULL);
  g_return_val_if_fail ((width != 0) && (height != 0), NULL);
  g_return_val_if_fail (window == NULL || GDK_IS_WINDOW (window), NULL);

  if (!window)
    window = gdk_parent_root;

  if (GDK_DRAWABLE_DESTROYED (window))
    return NULL;

  pixmap = gdk_win32_pixmap_alloc ();
  private = (GdkDrawablePrivate *) pixmap;

  private->width = width;
  private->height = height;

  bpl = ((width - 1) / 8 + 1);
  aligned_bpl = ((bpl - 1) / 2 + 1) * 2;
  bits = g_malloc (aligned_bpl * height);
  for (i = 0; i < height; i++)
    for (j = 0; j < bpl; j++)
      bits[i*aligned_bpl + j] = mirror[(guchar) data[i*bpl + j]];

  GDK_DRAWABLE_WIN32DATA (pixmap)->xid =
    CreateBitmap (width, height, 1, 1, bits);

  GDK_NOTE (MISC, g_print ("gdk_bitmap_create_from_data: %dx%d = %#x\n",
			   width, height, GDK_DRAWABLE_XID (pixmap)));

  g_free (bits);

  private->colormap = NULL;
  gdk_xid_table_insert (&GDK_DRAWABLE_XID (pixmap), pixmap);

  return pixmap;
}

GdkPixmap*
gdk_pixmap_create_from_data (GdkWindow   *window,
			     const gchar *data,
			     gint         width,
			     gint         height,
			     gint         depth,
			     GdkColor    *fg,
			     GdkColor    *bg)
{
  /* Oh wow. I struggled with dozens of lines of code trying to get
   * this right using a monochrome Win32 bitmap created from data, and
   * a colour DIB section as the result, trying setting pens,
   * background colors, whatnot and BitBlt:ing.  Nope. Then finally I
   * realized it's much easier to do it using gdk...:
   */

  GdkPixmap *result = gdk_pixmap_new (window, width, height, depth);
  GdkPixmap *source = gdk_bitmap_create_from_data (window, data, width, height);
  GdkGC *gc = gdk_gc_new (result);
  gdk_gc_set_foreground (gc, fg);
  gdk_gc_set_background (gc, bg);
  gdk_draw_drawable (result, gc, source, 0, 0, 0, 0, width, height);
  gdk_drawable_unref (source);
  gdk_gc_unref (gc);

  GDK_NOTE (MISC, g_print ("gdk_pixmap_create_from_data: %dx%dx%d = %#x\n",
			   width, height, depth,
			   GDK_DRAWABLE_XID (result)));
  return result;
}

static gint
gdk_pixmap_seek_string (FILE  *infile,
                        const gchar *str,
                        gint   skip_comments)
{
  char instr[1024];

  while (1)
    {
      if (fscanf (infile, "%1023s", instr) != 1)
	return FALSE;
	  
      if (skip_comments == TRUE && strcmp (instr, "/*") == 0)
        {
	  do
	    {
	      if (fscanf (infile, "%1023s", instr) != 1)
		return FALSE;
	    }
	  while (strcmp (instr, "*/") != 0);
        }
      else if (strcmp (instr, str) == 0)
        return TRUE;
    }
}

static gint
gdk_pixmap_seek_char (FILE  *infile,
                      gchar  c)
{
  gint b, oldb;

  while ((b = getc(infile)) != EOF)
    {
      if (c != b && b == '/')
	{
	  b = getc (infile);
	  if (b == EOF)
	    return FALSE;
	  else if (b == '*')	/* we have a comment */
 	    {
	      b = -1;
	      do
 		{
 		  oldb = b;
		  b = getc (infile);
 		  if (b == EOF)
 		    return FALSE;
 		}
 	      while (!(oldb == '*' && b == '/'));
 	    }
        }
      else if (c == b)
 	return TRUE;
    }
  return FALSE;
}

static gint
gdk_pixmap_read_string (FILE  *infile,
                        gchar **buffer,
			guint *buffer_size)
{
  gint c;
  guint cnt = 0, bufsiz, ret = FALSE;
  gchar *buf;

  buf = *buffer;
  bufsiz = *buffer_size;
  if (buf == NULL)
    {
      bufsiz = 10 * sizeof (gchar);
      buf = g_new(gchar, bufsiz);
    }

  do
    c = getc (infile);
  while (c != EOF && c != '"');

  if (c != '"')
    goto out;

  while ((c = getc(infile)) != EOF)
    {
      if (cnt == bufsiz)
	{
	  guint new_size = bufsiz * 2;
	  if (new_size > bufsiz)
	    bufsiz = new_size;
	  else
	    goto out;
	
 	  buf = (gchar *) g_realloc (buf, bufsiz);
	  buf[bufsiz-1] = '\0';
	}

      if (c != '"')
        buf[cnt++] = c;
      else
        {
          buf[cnt] = 0;
	  ret = TRUE;
	  break;
        }
    }

 out:
  buf[bufsiz-1] = '\0';		/* ensure null termination for errors */
  *buffer = buf;
  *buffer_size = bufsiz;
  return ret;
}

static gchar*
gdk_pixmap_skip_whitespaces (gchar *buffer)
{
  gint32 index = 0;

  while (buffer[index] != 0 && (buffer[index] == 0x20 || buffer[index] == 0x09))
    index++;

  return &buffer[index];
}

static gchar*
gdk_pixmap_skip_string (gchar *buffer)
{
  gint32 index = 0;

  while (buffer[index] != 0 && buffer[index] != 0x20 && buffer[index] != 0x09)
    index++;

  return &buffer[index];
}

#define MAX_COLOR_LEN 120

static gchar*
gdk_pixmap_extract_color (gchar *buffer)
{
  gint counter, numnames;
  gchar *ptr = NULL, ch, temp[128];
  gchar color[MAX_COLOR_LEN], *retcol;
  gint space;

  counter = 0;
  while (ptr == NULL)
    {
      if (buffer[counter] == 'c')
        {
          ch = buffer[counter + 1];
          if (ch == 0x20 || ch == 0x09)
            ptr = &buffer[counter + 1];
        }
      else if (buffer[counter] == 0)
        return NULL;

      counter++;
    }

  ptr = gdk_pixmap_skip_whitespaces (ptr);

  if (ptr[0] == 0)
    return NULL;
  else if (ptr[0] == '#')
    {
      counter = 1;
      while (ptr[counter] != 0 &&
             ((ptr[counter] >= '0' && ptr[counter] <= '9') ||
              (ptr[counter] >= 'a' && ptr[counter] <= 'f') ||
              (ptr[counter] >= 'A' && ptr[counter] <= 'F')))
        counter++;

      retcol = g_new (gchar, counter+1);
      strncpy (retcol, ptr, counter);

      retcol[counter] = 0;

      return retcol;
    }

  color[0] = 0;
  numnames = 0;

  space = MAX_COLOR_LEN - 1;
  while (space > 0)
    {
      sscanf (ptr, "%127s", temp);

      if (((gint)ptr[0] == 0) ||
	  (strcmp ("s", temp) == 0) || (strcmp ("m", temp) == 0) ||
          (strcmp ("g", temp) == 0) || (strcmp ("g4", temp) == 0))
	{
	  break;
	}
      else
        {
          if (numnames > 0)
	    {
	      space -= 1;
	      strcat (color, " ");
	    }
	  strncat (color, temp, space);
	  space -= MIN (space, strlen (temp));
          ptr = gdk_pixmap_skip_string (ptr);
          ptr = gdk_pixmap_skip_whitespaces (ptr);
          numnames++;
        }
    }

  retcol = g_strdup (color);
  return retcol;
}


enum buffer_op
{
  op_header,
  op_cmap,
  op_body
};


static void
gdk_xpm_destroy_notify (gpointer data)
{
  _GdkPixmapInfo *info = (_GdkPixmapInfo *)data;
  GdkColor color;
  int i;

  for (i=0; i<info->ncolors; i++)
    {
      color.pixel = info->pixels[i];
      gdk_colormap_free_colors (info->colormap, &color, 1);
    }

  gdk_colormap_unref (info->colormap);
  g_free (info);
}

static GdkPixmap *
_gdk_pixmap_create_from_xpm (GdkWindow   *window,
			     GdkColormap *colormap,
			     GdkBitmap  **mask,
			     GdkColor    *transparent_color,
			     gchar *    (*get_buf) (enum buffer_op op,
						    gpointer       handle),
			     gpointer     handle)
{
  GdkPixmap *pixmap = NULL;
  GdkImage *image = NULL;
  GdkVisual *visual;
  GdkGC *gc = NULL;
  GdkColor tmp_color;
  gint width, height, num_cols, cpp, n, ns, cnt, xcnt, ycnt, wbytes;
  gchar *buffer, pixel_str[32];
  gchar *name_buf;
  _GdkPixmapColor *color = NULL, *fallbackcolor = NULL;
  _GdkPixmapColor *colors = NULL;
  gulong index;
  GHashTable *color_hash = NULL;
  _GdkPixmapInfo *color_info = NULL;

  if ((window == NULL) && (colormap == NULL))
    g_warning ("Creating pixmap from xpm with NULL window and colormap");

  if (window == NULL)
    window = gdk_parent_root;

  if (colormap == NULL)
    {
      colormap = gdk_drawable_get_colormap (window);
      visual = gdk_drawable_get_visual (window);
    }
  else
    visual = ((GdkColormapPrivate *)colormap)->visual;

  buffer = (*get_buf) (op_header, handle);
  if (buffer == NULL)
    return NULL;

  sscanf (buffer,"%d %d %d %d", &width, &height, &num_cols, &cpp);
  if (cpp >= 32)
    {
      g_warning ("Pixmap has more than 31 characters per color");
      return NULL;
    }

  color_hash = g_hash_table_new (g_str_hash, g_str_equal);

  if (transparent_color == NULL)
    {
      gdk_color_white (colormap, &tmp_color);
      transparent_color = &tmp_color;
    }

  /* For pseudo-color and grayscale visuals, we have to remember
   * the colors we allocated, so we can free them later.
   */
  if ((visual->type == GDK_VISUAL_PSEUDO_COLOR) ||
      (visual->type == GDK_VISUAL_GRAYSCALE))
    {
      color_info = g_malloc (sizeof (_GdkPixmapInfo) +
			     sizeof(gulong) * (num_cols - 1));
      color_info->ncolors = num_cols;
      color_info->colormap = colormap;
      gdk_colormap_ref (colormap);
    }

  name_buf = g_new (gchar, num_cols * (cpp+1));
  colors = g_new (_GdkPixmapColor, num_cols);

  for (cnt = 0; cnt < num_cols; cnt++)
    {
      gchar *color_name;

      buffer = (*get_buf) (op_cmap, handle);
      if (buffer == NULL)
	goto error;

      color = &colors[cnt];
      color->color_string = &name_buf [cnt * (cpp + 1)];
      strncpy (color->color_string, buffer, cpp);
      color->color_string[cpp] = 0;
      buffer += strlen (color->color_string);
      color->transparent = FALSE;

      color_name = gdk_pixmap_extract_color (buffer);

      if (color_name == NULL ||
	  gdk_color_parse (color_name, &color->color) == FALSE)
	{
	  color->color = *transparent_color;
	  color->transparent = TRUE;
	}

      g_free (color_name);

      /* FIXME: The remaining slowness appears to happen in this
         function. */
      gdk_color_alloc (colormap, &color->color);

      if (color_info)
	color_info->pixels[cnt] = color->color.pixel;

      g_hash_table_insert (color_hash, color->color_string, color);
      if (cnt == 0)
	fallbackcolor = color;
    }

  index = 0;
  image = gdk_image_new (GDK_IMAGE_FASTEST, visual, width, height);

  if (mask)
    {
      /* The pixmap mask is just a bits pattern.
       * Color 0 is used for background and 1 for foreground.
       * We don't care about the colormap, we just need 0 and 1.
       */
      GdkColor mask_pattern;

      *mask = gdk_pixmap_new (window, width, height, 1);
      gc = gdk_gc_new (*mask);

      mask_pattern.pixel = 0;
      gdk_gc_set_foreground (gc, &mask_pattern);
      gdk_draw_rectangle (*mask, gc, TRUE, 0, 0, -1, -1);

      mask_pattern.pixel = 1;
      gdk_gc_set_foreground (gc, &mask_pattern);
    }

  wbytes = width * cpp;
  for (ycnt = 0; ycnt < height; ycnt++)
    {
      buffer = (*get_buf) (op_body, handle);

      /* FIXME: this slows things down a little - it could be
       * integrated into the strncpy below, perhaps. OTOH, strlen
       * is fast.
       */
      if ((buffer == NULL) || strlen (buffer) < wbytes)
	continue;

      for (n = 0, cnt = 0, xcnt = 0; n < wbytes; n += cpp, xcnt++)
	{
	  strncpy (pixel_str, &buffer[n], cpp);
	  pixel_str[cpp] = 0;
	  ns = 0;
	  
	  color = g_hash_table_lookup (color_hash, pixel_str);
	  
	  if (!color) /* screwed up XPM file */
	    color = fallbackcolor;
	  
	  gdk_image_put_pixel (image, xcnt, ycnt, color->color.pixel);
	  
	  if (mask && color->transparent)
	    {
	      if (cnt < xcnt)
		gdk_draw_line (*mask, gc, cnt, ycnt, xcnt - 1, ycnt);
	      cnt = xcnt + 1;
	    }
	}

      if (mask && (cnt < xcnt))
	gdk_draw_line (*mask, gc, cnt, ycnt, xcnt - 1, ycnt);
    }

 error:

  if (mask)
    gdk_gc_unref (gc);

  if (image != NULL)
    {
      pixmap = gdk_pixmap_new (window, width, height, visual->depth);

      if (color_info)
	gdk_drawable_set_data (pixmap, "gdk-xpm", color_info,
			       gdk_xpm_destroy_notify);

      gc = gdk_gc_new (pixmap);
      gdk_gc_set_foreground (gc, transparent_color);
      gdk_draw_image (pixmap, gc, image, 0, 0, 0, 0, image->width, image->height);
      gdk_gc_unref (gc);
      gdk_image_unref (image);
    }
  else if (color_info)
    gdk_xpm_destroy_notify (color_info);

  if (color_hash != NULL)
    g_hash_table_destroy (color_hash);

  if (colors != NULL)
    g_free (colors);

  if (name_buf != NULL)
    g_free (name_buf);

  return pixmap;
}


struct file_handle
{
  FILE *infile;
  gchar *buffer;
  guint buffer_size;
};


static gchar *
file_buffer (enum buffer_op op, gpointer handle)
{
  struct file_handle *h = handle;

  switch (op)
    {
    case op_header:
      if (gdk_pixmap_seek_string (h->infile, "XPM", FALSE) != TRUE)
	break;

      if (gdk_pixmap_seek_char (h->infile,'{') != TRUE)
	break;
      /* Fall through to the next gdk_pixmap_seek_char. */

    case op_cmap:
      gdk_pixmap_seek_char (h->infile, '"');
      fseek (h->infile, -1, SEEK_CUR);
      /* Fall through to the gdk_pixmap_read_string. */

    case op_body:
      gdk_pixmap_read_string (h->infile, &h->buffer, &h->buffer_size);
      return h->buffer;
    }
  return 0;
}

GdkPixmap*
gdk_pixmap_colormap_create_from_xpm (GdkWindow   *window,
				     GdkColormap *colormap,
				     GdkBitmap  **mask,
				     GdkColor    *transparent_color,
				     const gchar *filename)
{
  struct file_handle h;
  GdkPixmap *pixmap = NULL;

  memset (&h, 0, sizeof (h));
  h.infile = fopen (filename, "rb");
  if (h.infile != NULL)
    {
      pixmap = _gdk_pixmap_create_from_xpm (window, colormap, mask,
					    transparent_color,
					    file_buffer, &h);
      fclose (h.infile);
      g_free (h.buffer);
    }

  return pixmap;
}

GdkPixmap*
gdk_pixmap_create_from_xpm (GdkWindow  *window,
			    GdkBitmap **mask,
			    GdkColor   *transparent_color,
			    const gchar *filename)
{
  return gdk_pixmap_colormap_create_from_xpm (window, NULL, mask,
					      transparent_color, filename);
}

struct mem_handle
{
  gchar **data;
  int offset;
};


static gchar *
mem_buffer (enum buffer_op op, gpointer handle)
{
  struct mem_handle *h = handle;
  switch (op)
    {
    case op_header:
    case op_cmap:
    case op_body:
      if (h->data[h->offset])
	return h->data[h->offset ++];
    }
  return 0;
}

GdkPixmap*
gdk_pixmap_colormap_create_from_xpm_d (GdkWindow  *window,
				       GdkColormap *colormap,
				       GdkBitmap **mask,
				       GdkColor   *transparent_color,
				       gchar     **data)
{
  struct mem_handle h;
  GdkPixmap *pixmap = NULL;

  memset (&h, 0, sizeof (h));
  h.data = data;
  pixmap = _gdk_pixmap_create_from_xpm (window, colormap, mask,
					transparent_color,
					mem_buffer, &h);
  return pixmap;
}

GdkPixmap*
gdk_pixmap_create_from_xpm_d (GdkWindow  *window,
			      GdkBitmap **mask,
			      GdkColor   *transparent_color,
			      gchar     **data)
{
  return gdk_pixmap_colormap_create_from_xpm_d (window, NULL, mask,
						transparent_color, data);
}

GdkPixmap*
gdk_pixmap_foreign_new (guint32 anid)
{
  GdkPixmap *pixmap;
  GdkDrawablePrivate *private;
  HBITMAP xpixmap;
  SIZE size;
  unsigned int x_ret, y_ret, w_ret, h_ret, bw_ret, depth_ret;

  /* check to make sure we were passed something at
     least a little sane */
  g_return_val_if_fail((anid != 0), NULL);

  /* set the pixmap to the passed in value */
  xpixmap = (HBITMAP) anid;

  /* get information about the BITMAP to fill in the structure for
     the gdk window */
  GetBitmapDimensionEx (xpixmap, &size);
  w_ret = size.cx;
  h_ret = size.cy;

  /* allocate a new gdk pixmap */
  pixmap = gdk_win32_pixmap_alloc ();
  private = (GdkDrawablePrivate *) pixmap;

  GDK_DRAWABLE_WIN32DATA (pixmap)->xid = xpixmap;
  private->colormap = NULL;
  private->width = w_ret;
  private->height = h_ret;

  gdk_xid_table_insert(&GDK_DRAWABLE_XID (pixmap), pixmap);

  return pixmap;
}