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xdvi.h

/*========================================================================*\

Copyright (c) 1990-2004  Paul Vojta

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL PAUL VOJTA OR ANY OTHER AUTHOR OF THIS SOFTWARE BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

NOTE:
xdvi is based on prior work, as noted in the modification history
in xdvi.c.

\*========================================================================*/

/*
 *    Original version by Eric C. Cooper, CMU
 */

#ifndef     XDVI_H_
#define     XDVI_H_

#include "xdvi-config.h"

/* headers used by all modules */
#include "xdvi-debug.h"
#include "c-auto.h"

#include "kpathsea/c-auto.h" /* kpathsea definitions */
#include "kpathsea/config.h"

/********************************
 *    The C environment *
 *******************************/

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

/* in case stdlib.h doesn't define these ... */
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif

#ifdef HAVE_WORKING_NL_LANGINFO_CODESET
# define USE_LANGINFO 1
#else
# define USE_LANGINFO 0
#endif

#if HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifndef WIFEXITED
# define WIFEXITED(status)    (((status) & 255) == 0)
#endif
#ifndef WEXITSTATUS
# define WEXITSTATUS(status)  ((unsigned)(status) >> 8)
#endif
#ifndef WIFSIGNALED
# ifndef WIFSTOPPED
#  define WIFSTOPPED(status)  (((status) & 0xff) == 0x7f)
# endif
# define WIFSIGNALED(status)  (!WIFSTOPPED(status) && !WIFEXITED(status))
#endif
#ifndef WTERMSIG
# define WTERMSIG(status)     ((status) & 0x7f)
#endif

/*
 * If this is set to 1, xdvi will explicitly clear the internal GS
 * buffer after every page that contained a PS special (figure etc.)
 * to avoid artifacts with later PS specials (overlapping lines etc.);
 * see also bug #633420. This workaround will slow down the drawing of
 * the next page considerably. Currently xdvi also sometimes dies with
 * `Internal error in beginheader_gs()'
 * when paging quickly through a file with this hack enabled.
 * Set to 0 to disable the hack.
 */
#define GS_PIXMAP_CLEARING_HACK 1

#ifdef __hpux
/* On HP-UX 10.10 B and 20.10, compiling with _XOPEN_SOURCE + ..._EXTENDED
 * leads to poll() not realizing that a file descriptor is writable in psgs.c.
 */
# define _HPUX_SOURCE   1
#else
# ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE  600
# endif
# define _XOPEN_SOURCE_EXTENDED     1
# define __EXTENSIONS__ 1     /* needed to get struct timeval on SunOS 5.5 */
# define _SVID_SOURCE   1     /* needed to get S_IFLNK in glibc */
# define _BSD_SOURCE    1     /* needed to get F_SETOWN in glibc-2.1.3 */
#endif

/* Some O/S dependent kludges. */
#ifdef _AIX
# define _ALL_SOURCE 1
#endif

/* just a kludge, no real portability here ... */
#define DIR_SEPARATOR '/'

#if STDC_HEADERS
# include <stddef.h>
# include <stdlib.h>
/* the following works around the wchar_t problem */
# include <X11/X.h>
# if HAVE_X11_XOSDEFS_H
#  include <X11/Xosdefs.h>
# endif
# ifdef X_NOT_STDC_ENV
#  undef X_NOT_STDC_ENV
#  undef X_WCHAR
#  include <X11/Xlib.h>
#  define X_NOT_STDC_ENV
# endif
#endif /* STDC_HEADERS */

/* For wchar_t et al., that the X files might want. */
#include "kpathsea/systypes.h"
#include "kpathsea/c-memstr.h"

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h> /* this should define MAXPATHLEN */
#endif
#include "kpathsea/c-pathmx.h" /* get fallback for PATH_MAX if all else fails */

#include <X11/Xlib.h>   /* include Xfuncs.h, if available */
#include <X11/Xutil.h>  /* needed for XDestroyImage */
#include <X11/Xos.h>

#include <X11/Xfuncs.h>
#include <X11/Intrinsic.h>

#ifndef MAXPATHLEN
# ifdef PATH_MAX
#  define MAXPATHLEN PATH_MAX
# else
#  define MAXPATHLEN 1024
# endif
#endif

#if defined(CFG2RES) && !defined(SELFAUTO)
# define SELFAUTO 1
#endif

#if defined(SELFAUTO) && !defined(DEFAULT_CONFIG_PATH)
# define DEFAULT_CONFIG_PATH "$SELFAUTODIR:$SELFAUTOPARENT"
#endif

/* NOTE: we don't use CFGFILE */

typedef     char        Bool3;            /* Yes/No/Maybe */

#define     True  1
#define     False 0
#define     Maybe 2


#ifdef DEBUG
#include<asm/msr.h>
extern unsigned long time_start, time_end;
#endif

#include <X11/Xmd.h>    /* get WORD64 and LONG64 */

#ifndef WORD64
# ifdef LONG64
typedef unsigned int xuint32;
# else
typedef unsigned long xuint32;
# endif
#endif

/* for unused parameters */
#ifndef UNUSED
#define UNUSED(x) ((void)(x))
#endif

#include <string.h>

#ifdef      VMS
#define     index strchr
#define     rindex      strrchr
#define     bzero(a, b) (void) memset ((void *) (a), 0, (size_t) (b))
#define bcopy(a, b, c)  (void) memmove ((void *) (b), (void *) (a), (size_t) (c))
#endif

#include <stdio.h>
#include <setjmp.h>

#if HAVE_UNISTD_H
# include <unistd.h>
#endif

/* all of these are POSIX and should have been defined by unistd.h: */
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif

/* see C FAQ; additional +1 for '\0' */
#define LENGTH_OF_INT ((sizeof(int) * CHAR_BIT + 2) / 3 + 1 + 1)
#define LENGTH_OF_LONG ((sizeof(long) * CHAR_BIT + 2) / 3 + 1 + 1)
#define LENGTH_OF_ULONG ((sizeof(unsigned long) * CHAR_BIT + 2) / 3 + 1 + 1)

#include "kpathsea/c-dir.h" /* dirent.h, NAMLEN */

extern KPSEDLL char *kpathsea_version_string;

#ifndef     NeedFunctionPrototypes
# if  __STDC__
#  define   NeedFunctionPrototypes  1
# else
#  define   NeedFunctionPrototypes  0
# endif
#endif

#ifndef     NeedWidePrototypes
# define NeedWidePrototypes   NeedFunctionPrototypes
#endif

#ifndef     NeedVarargsPrototypes
# define NeedVarargsPrototypes      NeedFunctionPrototypes
#endif

#include "kpathsea/c-vararg.h"

#ifndef     _XFUNCPROTOBEGIN
# define _XFUNCPROTOBEGIN
# define _XFUNCPROTOEND
#endif


/* If xmkmf is broken and there's a symlink from /usr/include/X11 to the right
 * place, then there will be no -I... argument on the cc command line for the
 * X include files.  Since gcc version 3 and higher sets __STDC__ to 0 when
 * including system header files on some platforms, we may end up with
 * NeedFunctionPrototypes set to 0 when it should be 1.  So, let's force the
 * issue.
 */
#if __STDC__ && !defined(FUNCPROTO)
/* FUNCPROTO is a bitmask specifying ANSI conformance (see Xfuncproto.h).
   The single bits specify varargs, const availability, prototypes etc.;
   we enable everything here. */
# define FUNCPROTO (-1)
#endif

#ifndef     VOLATILE
# if __STDC__ || (defined(__stdc__) && defined(__convex__))
#  define VOLATILE      volatile
# else
#  define VOLATILE      /* as nothing */
# endif
#endif

#ifndef     NORETURN
# ifdef     __GNUC__
#  ifndef __STRICT_ANSI__
#   define  NORETURN    volatile
#  else
#   define  NORETURN    /* as nothing */
#  endif
# else
#  define   NORETURN    /* as nothing */
# endif
#endif

#ifndef     OPEN_MODE
/*
 * SU, 2001/01/07: xdvi defines OPEN_MODE as "r" or as "r", "ctx=stm" (for VMS),
 * but we use the definition of FOPEN_R_MODE from kpathsea/c-fopen.h instead:
 */
# define OPEN_MODE FOPEN_R_MODE
#endif      /* OPEN_MODE */

#ifndef     VMS
# define OPEN_MODE_ARGS const char *
#else
# define OPEN_MODE_ARGS const char *, const char *
#endif

#ifndef __LINE__
# define __LINE__ 0
#endif

#ifndef __FILE__
# define __FILE__ "?"
#endif

#define     MAXDIM 32767

typedef     unsigned char     ubyte;

#if NeedWidePrototypes
typedef     unsigned int      wide_ubyte;
typedef     int         wide_bool;
#else
typedef     ubyte       wide_ubyte;
typedef     Boolean           wide_bool;
#endif

#if defined(MAKEPK) && !defined(MKTEXPK)
# define MKTEXPK 1
#endif

#define     spell_conv0(n, f)   ((long) (n * f))
#define     spell_conv(n)         spell_conv0(n, dimconv)

typedef BMTYPE bmTypeT;
typedef unsigned BMTYPE bmUnitT;
/* #define  BMUNIT                unsigned BMTYPE */
#define     BMBITS                (8 * BMBYTES) /* number of bits in a bmTypeT */

#define     ADD(a, b)   ((bmUnitT *) (((char *) a) + b))
#define     SUB(a, b)   ((bmUnitT *) (((char *) a) - b))

extern bmUnitT bit_masks[BMBITS + 1];

/* for safely printing char *s that might be NULL */
#define STRING_OR_NULL(x) ((x == NULL ? "<NULL>" : x))

#define INSIDE_MANE_WIN ((currwin.win == mane.win))
#define MAGNIFIER_ACTIVE ((magnifier.win != 0))

#define     mane_base_x 0
#define     mane_base_y 0


struct frame {
    /* dvi_h and dvi_v is the horizontal and vertical baseline position;
       it is the responsability of the set_char procedure to update
       them. */
    struct framedata {
      long dvi_h, dvi_v, w, x, y, z;
      int pxl_v;
    } data;
    struct frame *next, *prev;
};

#ifdef TEXXET
typedef void setcharRetvalT;
#else
typedef long setcharRetvalT;
#endif

typedef     setcharRetvalT (*set_char_proc) (
#ifdef TEXXET
                               wide_ubyte cmd,
#endif
                               wide_ubyte ch);

#define ROUNDUP(x,y) (((x)+(y)-1)/(y))

#ifndef     BDPI
#define     BDPI  600
#endif

#if defined(GS_PATH) && !defined(PS_GS)
# define PS_GS    1
#endif

#if defined(PS_DPS) || defined(PS_NEWS) || defined(PS_GS)
# define PS 1
#else
# define PS 0
#endif

typedef enum {
    XPRT_SHOW_NONE = 0U,
    XPRT_SHOW_STATUSLINE = 1,
    XPRT_SHOW_SCROLLBARS = 2,
#ifdef MOTIF
    XPRT_SHOW_PAGELIST = 4,
    XPRT_SHOW_TOOLBAR = 8,
    XPRT_SHOW_MENUBAR = 16,
    XPRT_SHOW_ALL = 31
#else
    XPRT_SHOW_BUTTONS = 4,
    XPRT_SHOW_ALL = 7
#endif
} expertFlagT;

typedef enum {
    MOUSE_MAGNIFIER_MODE,
    MOUSE_TEXT_MODE,
    MOUSE_RULER_MODE,
    MOUSE_MAX_MODE
} mouseModeT;

/* SUBPIXEL_NONE for no subpixel rendering, otherwise order of subpixels
   (from option/resource subPixels) */
typedef enum { SUBPIXEL_NONE, SUBPIXEL_RGB, SUBPIXEL_BGR } subpixelOrderT;

/*
 *    X resources.
 */
extern struct x_resources {
    /* NOTE: we don't use CFGFILE */
    Boolean no_init_file;
    Boolean regression;
    const char *geometry;
    const char *windowsize;
    Boolean remember_windowsize;
    int           app_defaults_fileversion;
    int           mouse_mode;
    Boolean use_tex_pages;
    int           shrinkfactor;
    const char *main_translations;
    const char *wheel_translations;
    int           wheel_unit;
    int           density;
    Boolean     omega;
#ifdef      GREY
    float   gamma;
/*     float          inverted_factor; */
#endif
    int           pixels_per_inch;
    Boolean delay_rulers;
    int           tick_length;
    char       *tick_units;
    const char *sidemargin;
    int           sidemargin_int;
    const char *topmargin;
    int           topmargin_int;
    const char *xoffset;
    int           xoffset_int;
    const char *yoffset;
    int           yoffset_int;
    Boolean use_current_offset; /* only used internally */
    const char *paper;
    Boolean     paper_landscape; /* only used internally */
    const char *alt_font;
#ifdef MKTEXPK
    Boolean makepk;
#endif
    const char *mfmode;
    const char *editor;
#ifdef MOTIF
    char       *prefs_editor_list;
#endif
    Boolean t1lib;
    const char *src_pos;
    const char *find_string;
    const char *text_encoding;
    Boolean src_fork;
    const char *sub_pixels;
    const char *file_history;
    int           file_history_size;
    Boolean no_file_arg_use_history;
    subpixelOrderT subpixel_order;
    float   subpixel_energy[3];
    Boolean unique;
    Boolean list_fonts;
    Boolean reverse;
    Boolean warn_spec;
    Boolean hush_chars;
    Boolean hush_chk;
    Boolean hush_stdout;
    Boolean safer;
#ifdef VMS
    const char *fore_color;
    const char *back_color;
#endif
    Pixel   fore_Pixel;
    Pixel   back_Pixel;
    /*     Pixel  brdr_Pixel; */
    Pixel   hl_Pixel;
    Pixel   cr_Pixel;
    const char *icon_geometry;
    Boolean keep_flag;
    Boolean copy;
    Boolean thorough;
    Boolean pause;
    const char *pause_special;
    Boolean fullscreen;
#ifdef PS
    int           postscript;
    Boolean allow_shell;
# ifdef     PS_DPS
    Boolean useDPS;
# endif
# ifdef     PS_NEWS
    Boolean useNeWS;
# endif
# ifdef     PS_GS
    Boolean useGS;
    Boolean gs_safer;
    Boolean gs_alpha;
    const char *gs_path;
    const char *gs_palette;
    int           gs_timeout;
# endif
# ifdef     MAGICK
    Boolean useMAGICK;
    const char *magick_cache;
# endif
#endif      /* PS */
    Boolean     prescan;
    Boolean     use_temp_fp;
    const char *debug_arg;
    const char *menu_translations;
    Boolean expert;
    float   watch_file; /* check DVI file every so often, in seconds */
    int         expert_mode;
#ifndef MOTIF
    Dimension     btn_side_spacing;
    Dimension     btn_top_spacing;
    Dimension     btn_between_spacing;
    /* ignored, only for backwards compatibility */
    Dimension     btn_between_extra;
    Dimension     btn_border_width;
#else /* MOTIF */
    const char *toolbar_translations;
#endif /* MOTIF */
    Boolean statusline;
#ifdef MOTIF
    /* not a user-level resource; indicates a problem with the toolbar, in
       which case the toolbar is disabled. */
    Boolean toolbar_unusable;
    const char *toolbar_pixmap_file;
    Boolean toolbar_buttons_raised;
    Boolean tooltips_in_statusline;
    int           tooltips_wait_period; /* used for communication with Tip.c */
    int           tooltips_wait_period_bak; /* uncustomized value */
    Boolean show_tooltips;
#endif
    Boolean pagelist_highlight_current;
    Dimension     pagelist_width;
    const char *mg_arg[5];
#if COLOR
    Boolean     use_color;
#endif
#ifdef GREY
    Boolean use_grey;
    Bool3   install;
#endif
    Boolean match_highlight_inverted;
    const char *dvips_path;
    const char *ps2pdf_path;
    int           dvips_hang;
    int           dvips_fail_hang;
    const char *dvips_printer_str;
    const char *dvips_options_str;
    int           default_saving_format;
    int           default_printing_target;
    char       *rule_color;
    Pixel   rule_pixel;
    int           link_style;
    char       *link_color;
    char       *visited_link_color;
    char       *browser;
#ifdef MOTIF
    char       *prefs_browser_list;
#endif
    char       *unknown_mime_suffix;
    char       *no_mime_suffix;
    char       *anchor_pos;
    /* bitmask of current search window settings */
    unsigned int    search_window_defaults;
    /*     char *    _scroll_pages; */
    char       *help_general;
    char       *help_hypertex;
    char       *help_othercommands;
    char       *help_pagemotion;
    char       *help_marking;
    char       *help_modes;
    char       *help_search;
    char       *help_mousebuttons;
    char       *help_sourcespecials;
    int         page_history_size;
} resource;

extern void reload_app_resources(void);


struct WindowRec {
    Window win;
    int     shrinkfactor;
    int     base_x;
    int     base_y;
    unsigned int width;
    unsigned int height;
    /* for pending expose events */
    int     min_x;
    int max_x;
    int min_y;
    int max_y;
};

struct event_info {
    int flags;
    VOLATILE int ctr;
    jmp_buf canit;
    jmp_buf next; /* to skip next event */
};

struct pause_info {
    int num;
    int *num_save;
    Boolean flag;
};

struct gc_info {
    GC rule;
    GC fore;
    GC inverted;
    GC high;
    GC linkcolor;
    GC visited_linkcolor;
    GC fore2;
    GC fore2_bak;
    GC fore2_bak1;
    GC copy;
    GC ruler;
    Boolean do_copy;
};

/* values of cursor flags */
#define CURSOR_LINK 1
#define CURSOR_MAG 2
/* flags for drag cursors */
#define CURSOR_DRAG_V 4
#define CURSOR_DRAG_H 8
#define CURSOR_DRAG_A 16
#define CURSOR_CORRUPTED 32   /* if file is corrupted */
#define CURSOR_TEXT 64

struct cursor_info {
    Cursor wait;
    Cursor ready;
    Cursor corrupted;
    Cursor link;
    Cursor rule;
    Cursor mag;
    /* horizontal/vertical/all directions drag */
    Cursor drag_h;
    Cursor drag_v;
    Cursor drag_a;
    /* support for `pause' feature */
    Cursor pause;
    /* text selection */
    Cursor text;
    
    /* one of the flags defined above */
    unsigned long flags;
};

struct window_expose_info {
    int min_x, max_x, min_y, max_y;
};

/* for communication with forward search in dvi-draw.c */
struct src_info {
    int fwd_box_page;
    const char *fwd_string;
};

struct widget_info {
    Widget top_level;
    Widget draw_widget, draw_background, clip_widget;
    Widget x_bar, y_bar;
#ifdef MOTIF
    Widget main_window, main_row, tool_bar, top_row, menu_bar;
#else
    Widget vport_widget, form_widget, paned;
#endif
};

struct page_info {
    unsigned int w, h;
    unsigned int unshrunk_w, unshrunk_h;
};

struct dvi_file_info {
    char *dirname;
    size_t dirlen;
    FILE *bak_fp;
    time_t time;  /* last file modification time */
};

/* struct to hold global settings that can't go into the resources,
 * as a replacement for global variables:
 */
extern struct program_globals {
    const char *program_name; /* argv[0] without the directory part */
    const char *xdvi_dir;     /* directory where xdvi is running in (for childs who need to change back to it) */
    char *dvi_name;           /* dvi file name, fully expanded with REALPATH */
    Boolean load_init_file;   /* whether to read/save ~/.xdvirc */
    char *orig_locale;        /* original locale we are running in */
    unsigned long debug;      /* debugging option */

    /* for older Motif versions or LessTif, which have broken
       handling of Act_motion() / Act_release() events */
    Boolean broken_motif_event_handling;
    
    /* offset from c-style (0 based) numbers to real pagenumbers;
       also contains the offset that user has set via Act_declare_page_number() */
    int pageno_correct;

    /* whether we warn about unrecognized specials. Copy of resource.warn_spec value,
       set to False in the drawing routine to reduce the amount of warnings given.
       Better maybe replace with hash lookup similar to fonts warnings? */
    Boolean warn_spec_now;

    /* used to save X resource values */
    char *curr_paper;
    char *curr_editor;
    char *curr_browser;
    float curr_gamma;
    Boolean curr_use_color;

    
    /* forward search info */
    struct src_info src;
    
    /* event information */
    struct event_info ev;

    /* support for `-pause' feature */
    struct pause_info pausing;
    
    /* window expose information */
    struct window_expose_info win_expose;

    struct gc_info gc;
    
    /* cursor information */
    struct cursor_info cursor;

    /* widget information */
    struct widget_info widgets;

    /* page size info */
    struct page_info page;

    /* DVI file and modification time info */
    struct dvi_file_info dvi_file;
    
} globals;


/* TODO: put these into globals as well */
extern struct WindowRec mane;
extern struct WindowRec currwin;
extern struct WindowRec magnifier;

#ifdef MOTIF
#include <Xm/Xm.h>
extern  XmStringCharSet G_charset;
#endif

extern XtAppContext app;
extern      char        *dvi_property;          /* for setting in window */
extern      size_t            dvi_property_length;
extern      XImage            *G_image;
extern int G_backing_store;
/* extern   int         home_x, home_y; */

extern      Display           *DISP;
extern      Screen            *SCRN;

extern      XtAccelerators    G_accels_cr;
#ifdef GREY
extern      Visual            *G_visual;
extern      unsigned int      G_depth;
extern      Colormap    G_colormap;
#else
# define G_depth  (unsigned int) DefaultDepthOfScreen(SCRN)
# define G_visual DefaultVisualOfScreen(SCRN)
# define G_colormap     DefaultColormapOfScreen(SCRN)
#endif


#define     TNTABLELEN  30    /* length of TeXnumber array (dvi file) */
#define     VFTABLELEN  5     /* length of TeXnumber array (virtual fonts) */

extern struct font *tn_table[TNTABLELEN];
extern struct font *font_head;
extern struct tn *tn_head;
extern wide_ubyte maxchar;
extern unsigned short current_timestamp;

extern int current_page;
extern int total_pages;

extern unsigned long magnification;
extern double dimconv;
extern double tpic_conv;

/* whether this file contains source specials, so that we need to
   update the `windows' property for forward search on expose events:
*/
extern Boolean have_src_specials;

extern Boolean dragcurs;      /* whether drag cursor is active; needed by hypertex.c */
extern int drag_flags;  /* 1 = vert, 2 = horiz; also needed by hypertex.c */

typedef void (*mouse_proc) (XEvent *);
extern mouse_proc mouse_motion;
extern mouse_proc mouse_release;

#if GREY
extern Pixel plane_masks[4];
#endif

#if GREY || COLOR
extern XColor color_data[2];
#endif

#if COLOR
struct rgb {
    unsigned short r, g, b;
};

struct pagecolor {
    struct rgb bg;
    unsigned int stacksize;
    struct rgb *colorstack;
};
struct pagecolor_info {
  /* different from non-k xdvi, we also need the allocated stack size,
     since it might differ from the number of pages (e.g. when loading
     a new file). */
    size_t size;
    /* this is const in non-k xdvi, but some instances of it may ultimately
       get free()d in full_reset_colors(), so it's not *really* const ...
    */
    struct pagecolor *stack;
};

/* Information on background color and initial color stack for each page.  */
extern struct pagecolor_info page_colors;

/* The initial color stack is obtained from the pagecolor record for a page.  */
extern struct rgb *color_bottom;
extern unsigned int color_bot_size; /* number of entries */

/* Additions to the runtime color stack on a given page are stored in a linked
   list.  "struct colorframe" is defined in special.c.  */
extern struct colorframe *rcs_top;

/* Color states.  */

/*
 * For each (foreground, background) color pair, we keep information (depending
 * on the color model).  It is organized as a linked list of linked lists,
 * with background color more significant.
 */

struct bgrec {
    struct bgrec *next;
    struct rgb color;
    struct fgrec *fg_head;
    Boolean pixel_good; /* if the pixel entry is valid */
    Pixel pixel;
};

struct fgrec {
    struct fgrec *next;
    struct rgb color;
    Boolean pixel_good;       /* if the pixel entry is valid */
    Pixel pixel;
#if GREY
    Boolean palette_good;     /* if the palette entry is valid */
    Pixel palette[16];        /* non-TrueColor only */
#endif
};

extern struct rgb fg_initial; /* Initial fg (from command line) */
extern struct rgb bg_initial; /* Initial bg */
extern struct bgrec *bg_head;       /* head of list */
extern struct bgrec *bg_current;    /* current bg value */
extern struct fgrec *fg_current;    /* current fg value */
extern struct fgrec *fg_active;           /* where the GCs are */

/* List of allocated colors (to be deallocated upon document change) */
extern Pixel *color_list;           /* list of colors */
extern unsigned int color_list_len; /* current len of list */
extern unsigned int color_list_max; /* allocated size */

/* Whether the color situation has been warned about.  */
extern Boolean color_warned;
#endif /* COLOR */

extern Boolean dvi_file_corrupted;

extern short magnifier_stat;  /* 1 = wait for expose, -1 = destroy upon expose */

/*
  ================================================================================
  globals from dvi-draw.c
  ================================================================================
*/

/*
 * The following is set when we're prescanning before opening up the windows,
 * and we hit a PostScript header file.  We can't start up gs until we get
 * a window to associate the process to, so we have to prescan twice.
 */
#if PS_GS
extern Boolean gs_postpone_prescan;
#endif

#if PS
extern int scanned_page_ps;   /* last page scanned for PS specials */
extern int scanned_page_ps_bak;     /* save the above if PS is turned off */
#endif

#if COLOR
extern int scanned_page_color;      /* last page scanned for color spcls */
#endif /* COLOR */

extern int scanned_page; /* last page prescanned */
extern int scanned_page_reset;      /* number to reset the above to */
extern ubyte *G_dvi_buf_ptr;
extern struct drawinf currinf;
extern Boolean drawing_mag;
extern Boolean htex_inside_href;

/* globals from hypertex.h */
/* current anchor to search for, either from command-line or from clicking mouse */
extern char *g_anchor_pos;
extern size_t g_anchor_len;

extern char *g_link_color_rgb;
extern char *g_visited_link_color_rgb;

/* globals from special.h */
/*
 * If we're in the middle of a PSFIG special.
 */
extern Boolean psfig_begun;
/*
 * Set if the -paper option overrides papersize specials.
 */
extern Boolean ignore_papersize_specials;
extern Boolean have_raw_postscript;
#if PS
extern struct psprocs psp, no_ps_procs;
#ifdef PS_GS
extern Boolean had_ps_specials;
#endif
#endif

#ifdef MAGICK
/* TODO: put access functions for these in special.c */
extern int bbox_angle;
extern Boolean bbox_valid;
extern unsigned int bbox_width;
extern unsigned int bbox_height;
extern int bbox_voffset;
#endif

/* globals from statusline.h */
extern int global_statusline_h; /* height of statusline, or 0 */
extern Widget statusline;


/*
 * The cursor shape in the magnifying glass is determined by which
 * window received the button press event.  Under Motif, it's mane.win,
 * under XAW, it's the parent of mane.win.
 */
#ifdef MOTIF
# define CURSORWIN      mane.win
#else
/* # define CURSORWIN   XtWindow(globals.widgets.form_widget) */
# define CURSORWIN      mane.win
#endif


/*
 * This was MOTIF_TIMERS in the non-k xdvi version, but since xdvik
 * also uses XtAppAddTimeOut() for Xaw, we always need to define it.
 * See the comment in events.c for further explanations.
 */
#if LD_ALLOWS_MULTIPLE_DEFINITIONS
# define XDVI_XT_TIMER_HACK 1
#else
# define XDVI_XT_TIMER_HACK 0
#endif

/* globally used GUI stuff */
#ifdef MOTIF
#include <Xm/Xm.h>
/* Note: non-k xdvi has MOTIF_TIMERS here, we use XDVI_XT_TIMER_HACK instead (see above) */

# ifndef DDIST
#  define DDIST 4
# endif
# ifndef DDIST_MAJOR
#  define DDIST_MAJOR 10
# endif
# ifndef DDIST_MINOR
#  define DDIST_MINOR 5
# endif
#endif

extern const char **get_paper_types(void);
extern size_t get_paper_types_size(void);

extern size_t get_magglass_items(void);
extern int get_magglass_width(int idx);
extern int get_magglass_height(int idx);


#ifdef STATUSLINE
/* this is only for the initialization; the statusline will reset it to a more adequate value: */
# define XTRA_H   17
#endif

/*
 * Generic structure for DVI scans; contains a buffer for longjmp()ing
 * out of the scanning process if it's interrupted by the user (ugh ...)
 * and a generic `void *' to scan-specific info.
 */
struct scan_info {
    jmp_buf done_env;
    void (*geom_special)(struct scan_info *info, const char *str, int str_len);
    void *data;
};

/*
 * Used by the geometry-scanning routines.
 * It passes pointers to routines to be called at certain
 * points in the dvi file, and other information.
 */
struct geom_info {
    void (*geom_box)(struct scan_info *, long, long, long, long);
    void *geom_data;
};

#ifdef      CFG2RES
struct cfg2res {
    const char *cfgname;      /* name in config file */
    const char *resname;      /* name of resource */
    Boolean numeric;    /* if numeric */
};
#endif

#define get_byte(fp)    ((unsigned char)getc(fp))
#define get_lbyte(fp)   ((long)get_byte(fp))

extern void get_icon_and_title(const char *filename, char **icon_name, char **title_name);
extern void set_icon_and_title(const char *icon_name, const char *title_name);
extern void reconfigure_window(Boolean fullsize, Dimension w, Dimension h,
                         Boolean save_position);
extern void set_windowsize(Dimension *ret_w, Dimension *ret_h, int add_w, int add_h, Boolean override);

#ifdef MOTIF
extern void motif_translations_hack(void);
#endif

#ifndef     MAX
# define MAX(i, j)  ((i) > (j) ? (i) : (j))
#endif

#ifndef     MIN
# define MIN(i, j)       ((i) < (j) ? (i) : (j))
#endif

#ifndef ABS
# define ABS(x)  (((x) < 0) ? (-(x)) : (x))
#endif

#define REPORT_XDVI_BUG_TEMPLATE "Please report this as a bug to:\n\
   http://sourceforge.net/tracker/?group_id=23164&atid=377580\n"

#if HAVE_ICONV && HAVE_ICONV_H
#undef HAVE_ICONV_H
#define HAVE_ICONV_H 1
#else
#undef HAVE_ICONV_H
#define HAVE_ICONV_H 0
#endif


#if HAVE_GOOD_SETSID_VFORK
# if HAVE_VFORK_H
#  include <vfork.h>
# endif
#else /* HAVE_GOOD_SETSID_VFORK */
/* Mac OS X 10.3 (Panther) (11/2003) doesn't allow setsid() within vfork() */
# undef vfork
# define vfork fork
#endif /* HAVE_GOOD_SETSID_VFORK */

/* enable following if you get unresolved messages about `iconv_open' etc.: */
#if 0
#define LIBICONV_PLUG
#define iconv_open libiconv_open
#define iconv_close libiconv_close
#define iconv libiconv
#endif /* 0 */

typedef ICONV_CHAR_PPTR_TYPE iconv_char_pptrT;

#define DEVEL_MODE 0

#endif      /* XDVI_H_ */

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