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+/* main.h: global variable declarations.
+
+Copyright (C) 1992 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#ifndef MAIN_H
+#define MAIN_H
+
+#include <kpathsea/types.h>
+#include "image-header.h"
+
+
+/* See main.c for explanations of these globals. */
+extern boolean trace_scanlines;
+extern image_header_type image_header;
+extern string input_name;
+extern string output_name;
+
+/* Generic routines to manipulate the image. */
+extern void (*image_open_input_file) (string filename);
+extern void (*image_close_input_file) (void);
+extern void (*image_get_header) (void);
+extern boolean (*image_get_scanline) (one_byte *);
+
+
+/* Print a scanline LINE of width WIDTH, if `trace_scanlines' is true.. */
+extern void print_scanline (one_byte line[], unsigned width);
+
+#endif /* not MAIN_H */