gdkpixmap.c 16.1 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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 */
#include "../config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
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/* Needed for SEEK_END in SunOS */
#include <unistd.h>
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#include <X11/Xlib.h>

#include "gdk.h"
#include "gdkprivate.h"

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

GdkPixmap*
gdk_pixmap_new (GdkWindow *window,
		gint       width,
		gint       height,
		gint       depth)
{
  GdkPixmap *pixmap;
  GdkWindowPrivate *private;
  GdkWindowPrivate *window_private;

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  g_return_val_if_fail ((window != NULL) || (depth != -1), NULL);
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  g_return_val_if_fail ((width != 0) && (height != 0), NULL);
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  if (!window)
    window = (GdkWindow*) &gdk_root_parent;

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  window_private = (GdkWindowPrivate*) window;
  if (window_private->destroyed)
    return NULL;

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  if (depth == -1)
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    depth = gdk_window_get_visual (window)->depth;
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  private = g_new (GdkWindowPrivate, 1);
  pixmap = (GdkPixmap*) private;

  private->xdisplay = window_private->xdisplay;
  private->window_type = GDK_WINDOW_PIXMAP;
  private->xwindow = XCreatePixmap (private->xdisplay, window_private->xwindow,
				    width, height, depth);
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  private->colormap = NULL;
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  private->parent = NULL;
  private->x = 0;
  private->y = 0;
  private->width = width;
  private->height = height;
  private->resize_count = 0;
  private->ref_count = 1;
  private->destroyed = 0;

  gdk_xid_table_insert (&private->xwindow, pixmap);

  return pixmap;
}

GdkPixmap *
gdk_bitmap_create_from_data (GdkWindow *window,
			     gchar     *data,
			     gint       width,
			     gint       height)
{
  GdkPixmap *pixmap;
  GdkWindowPrivate *private;
  GdkWindowPrivate *window_private;

  g_return_val_if_fail (data != NULL, NULL);
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  g_return_val_if_fail ((width != 0) && (height != 0), NULL);
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  if (!window)
    window = (GdkWindow*) &gdk_root_parent;

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  window_private = (GdkWindowPrivate*) window;
  if (window_private->destroyed)
    return NULL;

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  private = g_new (GdkWindowPrivate, 1);
  pixmap = (GdkPixmap*) private;

  private->parent = NULL;
  private->xdisplay = window_private->xdisplay;
  private->window_type = GDK_WINDOW_PIXMAP;
  private->x = 0;
  private->y = 0;
  private->width = width;
  private->height = height;
  private->resize_count = 0;
  private->ref_count = 1;
  private->destroyed = FALSE;

  private->xwindow = XCreateBitmapFromData (private->xdisplay,
					    window_private->xwindow,
					    data, width, height);

  gdk_xid_table_insert (&private->xwindow, pixmap);

  return pixmap;
}

GdkPixmap*
gdk_pixmap_create_from_data (GdkWindow *window,
			     gchar     *data,
			     gint       width,
			     gint       height,
			     gint       depth,
			     GdkColor  *fg,
			     GdkColor  *bg)
{
  GdkPixmap *pixmap;
  GdkWindowPrivate *private;
  GdkWindowPrivate *window_private;

  g_return_val_if_fail (data != NULL, NULL);
  g_return_val_if_fail (fg != NULL, NULL);
  g_return_val_if_fail (bg != NULL, NULL);
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  g_return_val_if_fail ((window != NULL) || (depth != -1), NULL);
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  g_return_val_if_fail ((width != 0) && (height != 0), NULL);
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  if (!window)
    window = (GdkWindow*) &gdk_root_parent;

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  window_private = (GdkWindowPrivate*) window;
  if (window_private->destroyed)
    return NULL;

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  if (depth == -1)
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    depth = gdk_window_get_visual (window)->depth;
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  private = g_new (GdkWindowPrivate, 1);
  pixmap = (GdkPixmap*) private;

  private->parent = NULL;
  private->xdisplay = window_private->xdisplay;
  private->window_type = GDK_WINDOW_PIXMAP;
  private->x = 0;
  private->y = 0;
  private->width = width;
  private->height = height;
  private->resize_count = 0;
  private->ref_count = 1;
  private->destroyed = FALSE;

  private->xwindow = XCreatePixmapFromBitmapData (private->xdisplay,
						  window_private->xwindow,
						  data, width, height,
						  fg->pixel, bg->pixel, depth);

  gdk_xid_table_insert (&private->xwindow, pixmap);

  return pixmap;
}

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

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

  return FALSE;
}

gint
gdk_pixmap_seek_char (FILE  *infile,
                      gchar  c)
{
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  gint b, oldb;
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  while ((b = getc(infile)) != EOF)
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    {
      if (c != b && b == '/')
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	{
	  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 == '/'));
 	    }
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        }
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      else if (c == b)
 	return TRUE;
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    }
  return FALSE;
}

gint
gdk_pixmap_read_string (FILE  *infile,
                        gchar **buffer,
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			guint *buffer_size)
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{
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  gint c;
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  guint cnt = 0, bufsiz, ret = FALSE;
  gchar *buf;
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  buf = *buffer;
  bufsiz = *buffer_size;
  if (buf == NULL)
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    {
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      bufsiz = 10 * sizeof (gchar);
      buf = g_new(gchar, bufsiz);
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    }

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

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

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

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

  return &buffer[index];
}

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

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

  return &buffer[index];
}

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/* Xlib crashed ince at a color name lengths around 125 */
#define MAX_COLOR_LEN 120

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

  color[0] = 0;
  numnames = 0;

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  space = MAX_COLOR_LEN - 1;
  while (space > 0)
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    {
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      sscanf (ptr, "%127s", temp);
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      if (((gint)ptr[0] == 0) ||
	  (strcmp ("s", temp) == 0) || (strcmp ("m", temp) == 0) ||
          (strcmp ("g", temp) == 0) || (strcmp ("g4", temp) == 0))
	{
	  break;
	}
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      else
        {
          if (numnames > 0)
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	    {
	      space -= 1;
	      strcat (color, " ");
	    }
	  strncat (color, temp, space);
	  space -= MIN (space, strlen (temp));
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          ptr = gdk_pixmap_skip_string (ptr);
          ptr = gdk_pixmap_skip_whitespaces (ptr);
          numnames++;
        }
    }

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  retcol = g_strdup (color);
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  return retcol;
}

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static void
free_color (gpointer key, gpointer value, gpointer user_data)
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{
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  g_free (key);
  g_free (value);
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}
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enum buffer_op
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{
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  op_header,
  op_cmap,
  op_body
};
  
  
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)
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{
  GdkPixmap *pixmap = NULL;
  GdkImage *image = NULL;
  GdkVisual *visual;
  GdkGC *gc;
  GdkColor tmp_color;
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  gint width, height, num_cols, cpp, n, ns, cnt, xcnt, ycnt, wbytes;
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  gchar *buffer, pixel_str[32];
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  _GdkPixmapColor *color = NULL, *fallbackcolor = NULL;
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  gulong index;
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  GHashTable *colors = NULL;
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  if ((window == NULL) && (colormap == NULL))
    g_warning ("Creating pixmap from xpm with NULL window and colormap");

  if (window == NULL)
    window = (GdkWindow *)&gdk_root_parent;

  if (colormap == NULL)
    {
      colormap = gdk_window_get_colormap (window);
      visual = gdk_window_get_visual (window);
    }
  else
    visual = ((GdkColormapPrivate *)colormap)->visual;
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  buffer = (*get_buf) (op_header, handle);
  if (buffer == NULL)
    return NULL;

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  sscanf (buffer,"%d %d %d %d", &width, &height, &num_cols, &cpp);
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  if (cpp >= 32)
    {
      g_warning ("Pixmap has more than 31 characters per color\n");
      return NULL;
    }
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  colors = g_hash_table_new (g_str_hash, g_str_equal);
  
  if (transparent_color == NULL)
      {
        gdk_color_white (colormap, &tmp_color);
        transparent_color = &tmp_color;
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    }

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

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      buffer = (*get_buf) (op_cmap, handle);
      if (buffer == NULL)
	goto error;
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      color = g_new (_GdkPixmapColor, 1);
      color->color_string = g_new(gchar, cpp + 1);
      strncpy (color->color_string, buffer, cpp);
      color->color_string[cpp] = 0;
      buffer += strlen (color->color_string);
      color->transparent = FALSE;
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      color_name = gdk_pixmap_extract_color (buffer);
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      if (color_name == NULL ||
	  gdk_color_parse (color_name, &color->color) == FALSE)
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	{
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	  color->color = *transparent_color;
	  color->transparent = TRUE;
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	}

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      g_free (color_name);

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      /* FIXME: The remaining slowness appears to happen in this
         function. */
      gdk_color_alloc (colormap, &color->color);
      g_hash_table_insert (colors, color->color_string, color);
      if (cnt == 0)
	fallbackcolor = color;
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    }

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

  gc = NULL;
  if (mask)
    {
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      /* 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;

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

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

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

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  wbytes = width * cpp;
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  for (ycnt = 0; ycnt < height; ycnt++)
    {
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      buffer = (*get_buf) (op_body, handle);
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      /* 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++)
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	{
	  strncpy (pixel_str, &buffer[n], cpp);
	  pixel_str[cpp] = 0;
	  ns = 0;

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	  color = g_hash_table_lookup (colors, pixel_str);
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	  if (!color) /* screwed up XPM file */
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	    color = fallbackcolor;
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	  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);
    }

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 error:

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  if (mask)
    gdk_gc_destroy (gc);

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  if (image != NULL)
    {
      pixmap = gdk_pixmap_new (window, width, height, visual->depth);
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      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_destroy (gc);
      gdk_image_destroy (image);
    }
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  if (colors != NULL)
    {
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      g_hash_table_foreach (colors, free_color, 0);
      g_hash_table_destroy (colors);
    }

  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 ++];
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    }
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  return 0;
}

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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);
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  return pixmap;
}

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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);
}

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GdkPixmap*
gdk_pixmap_ref (GdkPixmap *pixmap)
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{
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  GdkWindowPrivate *private = (GdkWindowPrivate *)pixmap;
  g_return_val_if_fail (pixmap != NULL, NULL);
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  private->ref_count += 1;
  return pixmap;
}
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void
gdk_pixmap_unref (GdkPixmap *pixmap)
{
  GdkWindowPrivate *private = (GdkWindowPrivate *)pixmap;
  g_return_if_fail(pixmap != NULL);

  private->ref_count -= 1;
  if (private->ref_count == 0)
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    {
      XFreePixmap (private->xdisplay, private->xwindow);
      gdk_xid_table_remove (private->xwindow);
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      g_free (private);
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    }
}
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GdkBitmap *
gdk_bitmap_ref (GdkBitmap *bitmap)
{
  return (GdkBitmap *)gdk_pixmap_ref ((GdkPixmap *)bitmap);
}

void
gdk_bitmap_unref (GdkBitmap *bitmap)
{
  gdk_pixmap_unref ((GdkPixmap *)bitmap);
}