/*
 * $XFree86: xc/programs/xterm/fontutils.c,v 1.14 1999/09/25 14:38:30 dawes Exp $
 */

/************************************************************

Copyright 1998 by Thomas E. Dickey <dickey@clark.net>

                        All Rights Reserved

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 THE ABOVE LISTED COPYRIGHT HOLDER(S) 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.

Except as contained in this notice, the name(s) of the above copyright
holders shall not be used in advertising or otherwise to promote the
sale, use or other dealings in this Software without prior written
authorization.

********************************************************/

/*
 * A portion of this module (for FontNameProperties) is adapted from EMU 1.3;
 * it constructs font names with specific properties changed, e.g., for bold
 * and double-size characters.
 */

#include <fontutils.h>

#include <data.h>
#include <menu.h>
#include <xterm.h>

#include <stdio.h>

/* from X11/Xlibint.h - not all vendors install this file */
#define CI_NONEXISTCHAR(cs) (((cs)->width == 0) && \
			     (((cs)->rbearing|(cs)->lbearing| \
			       (cs)->ascent|(cs)->descent) == 0))

#define CI_GET_CHAR_INFO_1D(fs,col,def,cs) \
{ \
    cs = def; \
    if (col >= fs->min_char_or_byte2 && col <= fs->max_char_or_byte2) { \
	if (fs->per_char == NULL) { \
	    cs = &fs->min_bounds; \
	} else { \
	    cs = &fs->per_char[(col - fs->min_char_or_byte2)]; \
	    if (CI_NONEXISTCHAR(cs)) cs = def; \
	} \
    } \
}

#define CI_GET_CHAR_INFO_2D(fs,row,col,def,cs) \
{ \
    cs = def; \
    if (row >= fs->min_byte1 && row <= fs->max_byte1 && \
	col >= fs->min_char_or_byte2 && col <= fs->max_char_or_byte2) { \
	if (fs->per_char == NULL) { \
	    cs = &fs->min_bounds; \
	} else { \
	    cs = &fs->per_char[((row - fs->min_byte1) * \
				(fs->max_char_or_byte2 - \
				 fs->min_char_or_byte2 + 1)) + \
			       (col - fs->min_char_or_byte2)]; \
	    if (CI_NONEXISTCHAR(cs)) cs = def; \
	} \
    } \
}

#define MAX_FONTNAME 200

/*
 * A structure to hold the relevant properties from a font
 * we need to make a well formed font name for it.
 */
typedef struct {
     /* registry, foundry, family */
     char *beginning;
     char *width;
     /* slant, width, add_style */
     char *middle;
     int pixel_size;
     char *point_size;
     int res_x;
     int res_y;
     char *spacing;
     /* charset registry, charset encoding */
     char *end;
} FontNameProperties;

/*
 * Returns the fields from start to stop in a dash- separated string.  This
 * function will modify the source, putting '\0's in the appropiate place and
 * moving the beginning forward to after the '\0'
 *
 * This will NOT work for the last field (but we won't need it).
 */
static char *
n_fields(char **source, int start, int stop)
{
	int i;
	char *str , *str1;

	/*
	* find the start-1th dash
	*/
	for (i = start-1, str = *source; i; i--, str++)
		if ((str = strchr(str, '-')) == 0)
			return 0;

	/*
	* find the stopth dash
	*/
	for (i = stop - start + 1, str1 = str; i; i--, str1++)
		if ((str1 = strchr(str1, '-')) == 0)
			return 0;

	/*
	* put a \0 at the end of the fields
	*/
	*(str1 - 1) = '\0';

	/*
	* move source forward
	*/
	*source = str1;

	return str;
}


/*
 * Gets the font properties from a given font structure.  We use the FONT name
 * to find them out, since that seems easier.
 *
 * Returns a pointer to a static FontNameProperties structure
 * or NULL on error.
 */
static FontNameProperties *
get_font_name_props(Display *dpy, XFontStruct *fs, char *result)
{
	static FontNameProperties props;
	static char *last_name;

	register XFontProp *fp;
	register int i;
	Atom fontatom = XInternAtom (dpy, "FONT", False);
	char *name;
	char *str;

	/*
	* first get the full font name
	*/
	for (name = 0, i = 0, fp = fs->properties;
		i < fs->n_properties;
			i++, fp++)
		if (fp->name == fontatom)
			name = XGetAtomName (dpy, fp->card32);

	if (name == 0)
		return 0;

	/*
	 * XGetAtomName allocates memory - don't leak
	 */
	if (last_name != 0)
		XFree(last_name);
	last_name = name;
	if (result != 0)
		strcpy(result, name);

	/*
	* Now split it up into parts and put them in
	* their places. Since we are using parts of
	* the original string, we must not free the Atom Name
	*/

	/* registry, foundry, family */
	if ((props.beginning = n_fields(&name, 1, 3)) == 0)
		return 0;

	/* weight is the next */
	if ((props.width = n_fields(&name, 1, 1)) == 0)
		return 0;

	/* slant, width, add style */
	if ((props.middle = n_fields(&name, 1, 3)) == 0)
		return 0;

	/* pixel size */
	if ((str = n_fields(&name, 1, 1)) == 0)
		return 0;
	if ((props.pixel_size = atoi(str)) == 0)
		return 0;

	/* point size */
	if ((props.point_size = n_fields(&name, 1, 1)) == 0)
		return 0;

	/* res_x */
	if ((str = n_fields(&name, 1, 1)) == 0)
		return 0;
	if ((props.res_x = atoi(str)) == 0)
		return 0;

	/* res_y */
	if ((str = n_fields(&name, 1, 1)) == 0)
		return 0;
	if ((props.res_y = atoi(str)) == 0)
		return 0;

	/* spacing */
	if ((props.spacing = n_fields(&name, 1, 1)) == 0)
		return 0;

	/* skip the average width */
	if ((str = n_fields(&name, 1, 1)) == 0)
		return 0;

	/* the rest: charset registry and charset encoding */
	props.end = name;

	return &props;
}

/*
 * Take the given font props and try to make a well formed font name specifying
 * the same base font and size and everything, but in bold.  The return value
 * comes from a static variable, so be careful if you reuse it.
 */
static char *
bold_font_name(FontNameProperties *props)
{
     static char ret[MAX_FONTNAME];

     /*
      * Put together something in the form
      * "<beginning>-bold-<middle>-<pixel_size>-<point_size>-<res_x>-<res_y>"\
      * "-<spacing>-*-<end>"
      */
     sprintf(ret, "%s-bold-%s-%d-%s-%d-%d-%s-*-%s",
	     props->beginning,
	     props->middle,
	     props->pixel_size,
	     props->point_size,
	     props->res_x,
	     props->res_y,
	     props->spacing,
	     props->end);

     return ret;
}

#if OPT_DEC_CHRSET
/*
 * Take the given font props and try to make a well formed font name specifying
 * the same base font but changed depending on the given attributes and chrset.
 *
 * For double width fonts, we just double the X-resolution, for double height
 * fonts we double the pixel-size and Y-resolution
 */
char *
xtermSpecialFont(unsigned atts, unsigned chrset)
{
#if OPT_TRACE
	static char old_spacing[80];
	static FontNameProperties old_props;
#endif
	TScreen *screen = &term->screen;
	FontNameProperties *props;
	char tmp[MAX_FONTNAME];
	char *ret;
	char *width;
	int pixel_size;
	int res_x;
	int res_y;

	props = get_font_name_props(screen->display, screen->fnt_norm, (char *)0);
	if (props == 0)
		return 0;

	pixel_size = props->pixel_size;
	res_x = props->res_x;
	res_y = props->res_y;
	if (atts & BOLD)
		width = "bold";
	else
		width = props->width;

	if (CSET_DOUBLE(chrset))
		res_x *= 2;

	if (chrset == CSET_DHL_TOP
	 || chrset == CSET_DHL_BOT) {
		res_y *= 2;
		pixel_size *= 2;
	}

#if OPT_TRACE
	if (old_props.res_x      != res_x
	 || old_props.res_x      != res_y
	 || old_props.pixel_size != pixel_size
	 || strcmp(old_props.spacing, props->spacing)) {
		TRACE(("xtermSpecialFont(atts = %#x, chrset = %#x)\n", atts, chrset))
		TRACE(("res_x      = %d\n", res_x))
		TRACE(("res_y      = %d\n", res_y))
		TRACE(("point_size = %s\n", props->point_size))
		TRACE(("pixel_size = %d\n", pixel_size))
		TRACE(("spacing    = %s\n", props->spacing))
		old_props.res_x      = res_x;
		old_props.res_x      = res_y;
		old_props.pixel_size = pixel_size;
		old_props.spacing    = strcpy(old_spacing, props->spacing);
	}
#endif

	sprintf(tmp, "%s-%s-%s-%d-%s-%d-%d-%s-*-%s",
		props->beginning,
		width,
		props->middle,
		pixel_size,
		props->point_size,
		res_x,
		res_y,
		props->spacing,
		props->end);

	ret = XtMalloc(strlen(tmp) + 1);
	strcpy(ret, tmp);

	return ret;
}
#endif /* OPT_DEC_CHRSET */

/*
 * Case-independent comparison for font-names, including wildcards.
 */
static Boolean
same_font_name(char *pattern, char *match)
{
	while (*pattern && *match) {
		if (*pattern == '*') {
			if (same_font_name(pattern+1, match)) {
				return True;
			} else if (same_font_name(pattern, match+1)) {
				return True;
			} else {
				return False;
			}
		} else {
			if (char2lower(*pattern++) != char2lower(*match++))
				return False;
		}
	}
	return (*pattern == *match);	/* both should be NUL */
}

/*
 * Double-check the fontname that we asked for versus what the font server
 * actually gave us.  The larger fixed fonts do not always have a matching bold
 * font, and the font server may try to scale another font or otherwise
 * substitute a mismatched font.
 *
 * If we cannot get what we requested, we will fallback to the original
 * behavior, which simulates bold by overstriking each character at one pixel
 * offset.
 */
static int
got_bold_font(Display *dpy, XFontStruct *fs, char *requested)
{
	FontNameProperties *fp;
	char actual[MAX_FONTNAME];
	int got;

	if ((fp = get_font_name_props(dpy, fs, actual)) == 0)
		got = 0;
	else
		got = same_font_name(requested, actual);
	return got;
}

/*
 * If the font server tries to adjust another font, it may not adjust it
 * properly.  Check that the bounding boxes are compatible.  Otherwise we'll
 * leave trash on the display when we mix normal and bold fonts.
 */
static int
same_font_size(XFontStruct *nfs, XFontStruct *bfs)
{
	return (
		nfs->ascent           == bfs->ascent
	 &&	nfs->descent          == bfs->descent
	 &&	nfs->min_bounds.width == bfs->min_bounds.width
	 &&	nfs->min_bounds.width == bfs->min_bounds.width
	 &&	nfs->max_bounds.width == bfs->max_bounds.width
	 &&	nfs->max_bounds.width == bfs->max_bounds.width);
}

/*
 * Check if the font looks like it has fixed width
 */
static int
is_fixed_font(XFontStruct *fs)
{
	return (fs->min_bounds.width == fs->max_bounds.width
	   &&   fs->min_bounds.width == fs->min_bounds.width);
}

#define EmptyFont(fs) ((fs)->ascent + (fs)->descent == 0 \
		   ||  (fs)->max_bounds.width == 0)
#define FontSize(fs) (((fs)->ascent + (fs)->descent) \
		    *  (fs)->max_bounds.width)

int
xtermLoadFont (
	TScreen *screen,
	char *nfontname,
	char *bfontname,
	Bool doresize,
	int fontnum)
{
	/* FIXME: use XFreeFontInfo */
	FontNameProperties *fp;
	XFontStruct *nfs = NULL;
	XFontStruct *bfs = NULL;
	XGCValues xgcv;
	unsigned long mask;
	GC new_normalGC      = NULL;
	GC new_normalboldGC  = NULL;
	GC new_reverseGC     = NULL;
	GC new_reverseboldGC = NULL;
	Pixel new_normal;
	Pixel new_revers;
	char *tmpname = NULL;
	char normal[MAX_FONTNAME];
	Boolean proportional = False;
	int ch;

	if (!nfontname) return 0;

	if (fontnum == fontMenu_fontescape
	 && nfontname != screen->menu_font_names[fontnum]) {
		tmpname = (char *) malloc (strlen(nfontname) + 1);
		if (!tmpname)
			return 0;
		strcpy (tmpname, nfontname);
	}

	TRACE(("xtermLoadFont normal %s\n", nfontname))

	if (!(nfs = XLoadQueryFont (screen->display, nfontname))) goto bad;
	if (EmptyFont(nfs))
		goto bad;		/* can't use a 0-sized font */

	strcpy(normal, nfontname);
	if (bfontname == 0) {
		fp = get_font_name_props(screen->display, nfs, normal);
		if (fp != 0) {
			bfontname = bold_font_name(fp);
			TRACE(("...derived bold %s\n", bfontname))
		}
		if (bfontname == 0
		 || (bfs = XLoadQueryFont (screen->display, bfontname)) == 0) {
			bfs = nfs;
			TRACE(("...cannot load a matching bold font\n"))
		} else if (!same_font_size(nfs, bfs)
		 || !got_bold_font(screen->display, bfs, bfontname)) {
			XFreeFont(screen->display, bfs);
			bfs = nfs;
			TRACE(("...did not get a matching bold font\n"))
		}
	} else if ((bfs = XLoadQueryFont (screen->display, bfontname)) == 0) {
		bfs = nfs;
		TRACE(("...cannot load bold font %s\n", bfontname))
	}

	if (EmptyFont(bfs))
		goto bad;		/* can't use a 0-sized font */

	if (!same_font_size(nfs, bfs)
	 && (is_fixed_font(nfs) && is_fixed_font(bfs))) {
		XFreeFont(screen->display, bfs);
		bfs = nfs;
		TRACE(("...fixing mismatched normal/bold fonts\n"))
		/*
		 * If we're given a nonnull bfontname here, it came from a
		 * resource setting.  Perhaps the user did something like set
		 * the "*font" in a resource file.  But they would be startled
		 * to see a mismatched bold font.  Try again, asking the font
		 * server for the appropriate font.
		 */
		if (bfontname != 0) {
			return xtermLoadFont (screen,
					      nfontname,
					      NULL,	/* throw it away! */
					      doresize,
					      fontnum);
		}
	}

	/*
	 * Normal/bold fonts should be the same width.  Also, the min/max
	 * values should be the same.
	 */
	if (!is_fixed_font(nfs)
	 || !is_fixed_font(bfs)
	 || nfs->max_bounds.width != bfs->max_bounds.width) {
		TRACE(("Proportional font! normal %d/%d, bold %d/%d\n",
			nfs->min_bounds.width,
			nfs->max_bounds.width,
			bfs->min_bounds.width,
			bfs->max_bounds.width))
		proportional = True;
	}

	mask = (GCFont | GCForeground | GCBackground | GCGraphicsExposures |
	GCFunction);

	new_normal = getXtermForeground(term->flags, term->cur_foreground);
	new_revers = getXtermBackground(term->flags, term->cur_background);

	xgcv.font = nfs->fid;
	xgcv.foreground = new_normal;
	xgcv.background = new_revers;
	xgcv.graphics_exposures = TRUE;	/* default */
	xgcv.function = GXcopy;

	new_normalGC = XtGetGC((Widget)term, mask, &xgcv);
	if (!new_normalGC) goto bad;

	if (nfs == bfs) {			/* there is no bold font */
		new_normalboldGC = new_normalGC;
	} else {
		xgcv.font = bfs->fid;
		new_normalboldGC = XtGetGC((Widget)term, mask, &xgcv);
		if (!new_normalboldGC) goto bad;
	}

	xgcv.font = nfs->fid;
	xgcv.foreground = new_revers;
	xgcv.background = new_normal;
	new_reverseGC   = XtGetGC((Widget)term, mask, &xgcv);
	if (!new_reverseGC) goto bad;

	if (nfs == bfs) {			/* there is no bold font */
		new_reverseboldGC = new_reverseGC;
	} else {
		xgcv.font = bfs->fid;
		new_reverseboldGC = XtGetGC((Widget)term, mask, &xgcv);
		if (!new_reverseboldGC) goto bad;
	}

	if (NormalGC(screen) != NormalBoldGC(screen))
		XtReleaseGC ((Widget) term, NormalBoldGC(screen));
	XtReleaseGC ((Widget) term, NormalGC(screen));

	if (ReverseGC(screen) != ReverseBoldGC(screen))
		XtReleaseGC ((Widget) term, ReverseBoldGC(screen));
	XtReleaseGC ((Widget) term, ReverseGC(screen));

	NormalGC(screen)      = new_normalGC;
	NormalBoldGC(screen)  = new_normalboldGC;
	ReverseGC(screen)     = new_reverseGC;
	ReverseBoldGC(screen) = new_reverseboldGC;

	/*
	 * If we're switching fonts, free the old ones.  Otherwise we'll leak
	 * the memory that is associated with the old fonts.  The
	 * XLoadQueryFont call allocates a new XFontStruct.
	 */
	if (screen->fnt_bold != 0
	 && screen->fnt_bold != screen->fnt_norm)
		XFreeFont(screen->display, screen->fnt_bold);
	if (screen->fnt_norm != 0)
		XFreeFont(screen->display, screen->fnt_norm);

	screen->fnt_norm = nfs;
	screen->fnt_bold = bfs;
	screen->fnt_prop = proportional;
	screen->fnt_boxes = True;

#if OPT_BOX_CHARS
	/*
	 * Xterm uses character positions 1-31 of a font for the line-drawing
	 * characters.  Check that they are all present.  The null character
	 * (0) is special, and is not used.
	 */
	for (ch = 1; ch < 32; ch++) {
		int n = ch;
#if OPT_WIDE_CHARS
		if (screen->utf8_mode) {
			n = dec2ucs[ch];
			if (n == UCS_REPL)
				continue;
		}
#endif
		if (xtermMissingChar(n, nfs)
		 || xtermMissingChar(n, bfs)) {
			screen->fnt_boxes = False;
			break;
		}
	}
#endif

	screen->enbolden = screen->bold_mode
		&& ((nfs == bfs) || same_font_name(normal, bfontname));
	TRACE(("Will %suse 1-pixel offset/overstrike to simulate bold\n", screen->enbolden ? "" : "not "))

	set_menu_font (False);
	screen->menu_font_number = fontnum;
	set_menu_font (True);
	if (tmpname) {			/* if setting escape or sel */
		if (screen->menu_font_names[fontnum])
			free (screen->menu_font_names[fontnum]);
		screen->menu_font_names[fontnum] = tmpname;
		if (fontnum == fontMenu_fontescape) {
			set_sensitivity (term->screen.fontMenu,
				fontMenuEntries[fontMenu_fontescape].widget,
				TRUE);
		}
#if OPT_SHIFT_KEYS
		screen->menu_font_sizes[fontnum] = FontSize(nfs);
#endif
	}
	set_cursor_gcs (screen);
	xtermUpdateFontInfo (screen, doresize);
	return 1;

bad:
	if (tmpname)
		free (tmpname);
	if (new_normalGC)
		XtReleaseGC ((Widget) term, screen->fullVwin.normalGC);
	if (new_normalGC && new_normalGC != new_normalboldGC)
		XtReleaseGC ((Widget) term, new_normalboldGC);
	if (new_reverseGC)
		XtReleaseGC ((Widget) term, new_reverseGC);
	if (new_reverseGC && new_reverseGC != new_reverseboldGC)
		XtReleaseGC ((Widget) term, new_reverseboldGC);
	if (nfs)
		XFreeFont (screen->display, nfs);
	if (bfs && nfs != bfs)
		XFreeFont (screen->display, bfs);
	return 0;
}

/*
 * Set the limits for the box that outlines the cursor.
 */
void
xtermSetCursorBox (TScreen *screen)
{
	static XPoint VTbox[NBOX];
	XPoint	*vp;

	vp = &VTbox[1];
	(vp++)->x = FontWidth(screen) - 1;
	(vp++)->y = FontHeight(screen) - 1;
	(vp++)->x = -(FontWidth(screen) - 1);
	vp->y = -(FontHeight(screen) - 1);
	screen->box = VTbox;
}

/*
 * Compute useful values for the font/window sizes
 */
void
xtermComputeFontInfo (TScreen *screen, struct _vtwin *win, XFontStruct *font, int sbwidth)
{
	int i, j, width, height;

	win->f_width  = (font->max_bounds.width);
	win->f_height = (font->ascent + font->descent);
	i = 2 * screen->border + sbwidth;
	j = 2 * screen->border;
	width  = (screen->max_col + 1) * win->f_width + i;
	height = (screen->max_row + 1) * win->f_height + j;
	win->fullwidth  = width;
	win->fullheight = height;
	win->width  = width - i;
	win->height = height - j;
}


/* save this information as a side-effect for double-sized characters */
void
xtermSaveFontInfo (TScreen *screen, XFontStruct *font)
{
	screen->fnt_wide = (font->max_bounds.width);
	screen->fnt_high = (font->ascent + font->descent);
}

/*
 * After loading a new font, update the structures that use its size.
 */
void
xtermUpdateFontInfo (TScreen *screen, Bool doresize)
{
	int scrollbar_width;
	struct _vtwin *win = &(screen->fullVwin);

	scrollbar_width = (term->misc.scrollbar
			? screen->scrollWidget->core.width +
			  screen->scrollWidget->core.border_width
			: 0);
	xtermComputeFontInfo (screen, win, screen->fnt_norm, scrollbar_width);
	xtermSaveFontInfo(screen, screen->fnt_norm);

	if (doresize) {
		if (VWindow(screen)) {
			XClearWindow (screen->display, VWindow(screen));
		}
		DoResizeScreen (term);	/* set to the new natural size */
		if (screen->scrollWidget)
			ResizeScrollBar (screen);
		Redraw ();
	}
	xtermSetCursorBox (screen);
}

#if OPT_BOX_CHARS

/*
 * Returns true if the given character is missing from the specified font.
 */
Bool
xtermMissingChar(unsigned ch, XFontStruct *font)
{
	if (font != 0
	&& font->per_char != 0
	&& !font->all_chars_exist) {
		static	XCharStruct dft, *tmp = &dft, *pc = 0;

		if (font->max_byte1 == 0) {
#if OPT_WIDE_CHARS
			if (ch > 255) {
				TRACE(("xtermMissingChar %#04x (row)\n", ch))
				return True;
			}
#endif
			CI_GET_CHAR_INFO_1D (font, ch, tmp, pc);
		}
#if OPT_WIDE_CHARS
		else {
			CI_GET_CHAR_INFO_2D (font, (ch >> 8), (ch & 0xff), tmp, pc);
		}
#endif

		if (CI_NONEXISTCHAR(pc)) {
			TRACE(("xtermMissingChar %#04x (!exists)\n", ch))
			return True;
		}
	}
	return False;
}

/*
 * The grid is abitrary, enough resolution that nothing's lost in initialization.
 */
#define BOX_HIGH 60
#define BOX_WIDE 60

#define MID_HIGH (BOX_HIGH/2)
#define MID_WIDE (BOX_WIDE/2)

/*
 * ...since we'll scale the values anyway.
 */
#define SCALE_X(n) n = (n * (screen->fnt_wide-1)) / (BOX_WIDE-1)
#define SCALE_Y(n) n = (n * (screen->fnt_high-1)) / (BOX_HIGH-1)

/*
 * Draw the given graphic character, if it is simple enough (i.e., a
 * line-drawing character).
 */
void
xtermDrawBoxChar(TScreen *screen, int ch, unsigned flags, GC gc, int x, int y)
{
	static const short
		diamond[] = {
			MID_WIDE,     BOX_HIGH/4,   3*BOX_WIDE/4, MID_WIDE,
			3*BOX_WIDE/4, MID_WIDE,     MID_WIDE,     3*BOX_HIGH/4,
			MID_WIDE,     3*BOX_HIGH/4, BOX_WIDE/4,   MID_HIGH,
			BOX_WIDE/4,   MID_HIGH,     MID_WIDE,     BOX_HIGH/4,
			MID_WIDE,     BOX_HIGH/3,   2*BOX_WIDE/3, MID_WIDE,
			2*BOX_WIDE/3, MID_WIDE,     MID_WIDE,     2*BOX_HIGH/3,
			MID_WIDE,     2*BOX_HIGH/3, BOX_WIDE/3,   MID_HIGH,
			BOX_WIDE/3,   MID_HIGH,     MID_WIDE,     BOX_HIGH/3,
			BOX_WIDE/4,   MID_HIGH,     3*BOX_WIDE/4, MID_HIGH,
			MID_WIDE,     BOX_HIGH/4,   MID_WIDE,     3*BOX_HIGH/4,
			-1
		},
		degrees[] = {
			MID_WIDE,     BOX_HIGH/4,   2*BOX_WIDE/3, 3*BOX_HIGH/8,
			2*BOX_WIDE/3, 3*BOX_HIGH/8, MID_WIDE,     MID_HIGH,
			MID_WIDE,     MID_HIGH,     BOX_WIDE/3,   3*BOX_HIGH/8,
			BOX_WIDE/3,   3*BOX_HIGH/8, MID_WIDE,     BOX_HIGH/4,
			-1
		},
		lower_right_corner[] = {
			0,            MID_HIGH,     MID_WIDE,     MID_HIGH,
			MID_WIDE,     MID_HIGH,     MID_WIDE,     0,
			-1
		},
		upper_right_corner[] = {
			0,            MID_HIGH,     MID_WIDE,     MID_HIGH,
			MID_WIDE,     MID_HIGH,     MID_WIDE,     BOX_HIGH,
			-1
		},
		upper_left_corner[] = {
			MID_WIDE,     MID_HIGH,     BOX_WIDE,     MID_HIGH,
			MID_WIDE,     MID_HIGH,     MID_WIDE,     BOX_HIGH,
			-1
		},
		lower_left_corner[] = {
			MID_WIDE,     0,            MID_WIDE,     MID_HIGH,
			MID_WIDE,     MID_WIDE,     BOX_WIDE,     MID_HIGH,
			-1
		},
		cross[] = {
			0,            MID_HIGH,     BOX_WIDE,     MID_HIGH,
			MID_WIDE,     0,            MID_WIDE,     BOX_HIGH,
			-1
		},
		scan_line_1[] = {
			0,            0,            BOX_WIDE,     0,
			-1
		},
		scan_line_3[] = {
			0,            BOX_HIGH/4,   BOX_WIDE,     BOX_HIGH/4,
			-1
		},
		scan_line_7[] = {
			0,            MID_HIGH,     BOX_WIDE,     MID_HIGH,
			-1
		},
		scan_line_9[] = {
			0,            3*BOX_HIGH/4, BOX_WIDE,     3*BOX_HIGH/4,
			-1
		},
		horizontal_line[] = {
			0,            BOX_HIGH,     BOX_WIDE,     BOX_HIGH,
			-1
		},
		left_tee[] = {
			MID_WIDE,     0,            MID_WIDE,     BOX_HIGH,
			MID_WIDE,     MID_HIGH,     BOX_WIDE,     MID_HIGH,
			-1
		},
		right_tee[] = {
			MID_WIDE,     0,            MID_WIDE,     BOX_HIGH,
			MID_WIDE,     MID_HIGH,     0,            MID_HIGH,
			-1
		},
		bottom_tee[] = {
			0,            MID_HIGH,     BOX_WIDE,     MID_HIGH,
			MID_WIDE,     0,            MID_WIDE,     MID_HIGH,
			-1
		},
		top_tee[] = {
			0,            MID_HIGH,     BOX_WIDE,     MID_HIGH,
			MID_WIDE,     MID_HIGH,     MID_WIDE,     BOX_HIGH,
			-1
		},
		vertical_line[] = {
			MID_WIDE,     0,            MID_WIDE,     BOX_HIGH,
			-1
		},
		less_than_or_equal[] = {
			5*BOX_WIDE/6, BOX_HIGH/6,   BOX_WIDE/5,   MID_HIGH,
			5*BOX_WIDE/6, 5*BOX_HIGH/6, BOX_WIDE/5,   MID_HIGH,
			BOX_WIDE/6,   5*BOX_HIGH/6, 5*BOX_WIDE/6, 5*BOX_HIGH/6,
			-1
		},
		greater_than_or_equal[] = {
			BOX_WIDE/6,   BOX_HIGH/6,   5*BOX_WIDE/6, MID_HIGH,
			BOX_WIDE/6,   5*BOX_HIGH/6, 5*BOX_WIDE/6, MID_HIGH,
			BOX_WIDE/6,   5*BOX_HIGH/6, 5*BOX_WIDE/6, 5*BOX_HIGH/6,
			-1
		};

	static const short *lines[] = {
		0,			/* 00 */
		diamond,		/* 01 */
		0,			/* 02 */
		0,			/* 03 */
		0,			/* 04 */
		0,			/* 05 */
		0,			/* 06 */
		degrees,		/* 07 */
		0,			/* 08 */
		0,			/* 09 */
		0,			/* 0A */
		lower_right_corner,	/* 0B */
		upper_right_corner,	/* 0C */
		upper_left_corner,	/* 0D */
		lower_left_corner,	/* 0E */
		cross,			/* 0F */
		scan_line_1,		/* 10 */
		scan_line_3,		/* 11 */
		scan_line_7,		/* 12 */
		scan_line_9,		/* 13 */
		horizontal_line,	/* 14 */
		left_tee,		/* 15 */
		right_tee,		/* 16 */
		bottom_tee,		/* 17 */
		top_tee,		/* 18 */
		vertical_line,		/* 19 */
		less_than_or_equal,	/* 1A */
		greater_than_or_equal,	/* 1B */
		0,			/* 1C */
		0,			/* 1D */
		0,			/* 1E */
		0,			/* 1F */
	};

	XGCValues values;
	GC gc2;
	const short *p;

#if OPT_WIDE_CHARS
	/*
	 * Try to show line-drawing characters if we happen to be in UTF-8
	 * mode, but have gotten an old-style font.
	 */
	if (screen->utf8_mode
	 && (ch > 127)
	 && (ch != UCS_REPL)) {
		unsigned n;
		for (n = 1; n < 32; n++) {
			if (dec2ucs[n] == ch
			 && !xtermMissingChar(n, (flags & BOLD)
				  ? screen->fnt_bold
				  : screen->fnt_norm)) {
				TRACE(("...use xterm-style linedrawing\n"))
				ch = n;
				break;
			}
		}
	}
#endif

	TRACE(("DRAW_BOX(%d) cell %dx%d at %d,%d%s\n",
		ch, screen->fnt_high, screen->fnt_wide, y, x,
		(ch < 0 || ch >= (int)(sizeof(lines)/sizeof(lines[0]))) ? "-BAD": ""))

	if (!XGetGCValues(screen->display, gc, GCBackground, &values))
		return;

	values.foreground = values.background;
	gc2 = XCreateGC(screen->display, VWindow(screen), GCForeground, &values);

	XFillRectangle(
		screen->display, VWindow(screen), gc2, x, y,
		screen->fnt_wide,
		screen->fnt_high);

	XCopyGC(screen->display, gc, (1<<GCLastBit)-1, gc2);
	XSetLineAttributes(screen->display, gc2,
		(flags&BOLD)
			? ((screen->fnt_high > 6)
			  ? screen->fnt_high/6
			  : 1)
			: ((screen->fnt_high > 8)
			  ? screen->fnt_high/8
			  : 1),
		LineSolid,
		CapProjecting,
		JoinMiter);

	if (ch >= 0
	 && ch < (int)(sizeof(lines)/sizeof(lines[0]))
	 && (p = lines[ch]) != 0) {
		int	coord[4];
		int	n = 0;
		while (*p >= 0) {
			coord[n++] = *p++;
			if (n == 4) {
				SCALE_X(coord[0]); SCALE_Y(coord[1]);
				SCALE_X(coord[2]); SCALE_Y(coord[3]);
				XDrawLine(
					screen->display,
					VWindow(screen), gc2,
					x + coord[0], y + coord[1],
					x + coord[2], y + coord[3]);
				n = 0;
			}
		}
	}
#if 0	/* bounding rectangle, for debugging */
	else {
		XDrawRectangle(
			screen->display, VWindow(screen), gc, x, y,
			screen->fnt_wide-1,
			screen->fnt_high-1);
	}
#endif

	XFreeGC(screen->display, gc2);
}
#endif

#if OPT_SHIFT_KEYS
static XFontStruct *
xtermFindFont (
	TScreen *screen,
	int fontnum)
{
	XFontStruct *nfs = 0;
	char *name;

	if ((name = screen->menu_font_names[fontnum]) != 0
	 && (nfs = XLoadQueryFont (screen->display, name)) != 0) {
		if (EmptyFont(nfs)) {
			XFreeFont (screen->display, nfs);
			nfs = 0;
		}
	}
	return nfs;
}

/*
 * Cache the font-sizes so subsequent larger/smaller font actions will go fast.
 */
static void
lookupFontSizes(TScreen *screen)
{
	int n;
	for (n = 0; n < NMENUFONTS; n++) {
		if (screen->menu_font_sizes[n] == 0) {
			XFontStruct *fs = xtermFindFont(screen, n);
			screen->menu_font_sizes[n] = -1;
			if (fs != 0) {
				screen->menu_font_sizes[n] = FontSize(fs);
				TRACE(("menu_font_sizes[%d] = %ld\n", n,
					screen->menu_font_sizes[n]))
				XFreeFont (screen->display, fs);
			}
		}
	}
}

/* ARGSUSED */
void
HandleLargerFont(
	Widget w GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	String *params GCC_UNUSED,
	Cardinal *param_count GCC_UNUSED)
{
	TScreen *screen = &term->screen;
	int n, m;

	lookupFontSizes(screen);
	for (n = 0, m = -1; n < NMENUFONTS; n++) {
		if ((screen->menu_font_sizes[n] > screen->menu_font_sizes[screen->menu_font_number])
		 && ((m < 0)
		  || (screen->menu_font_sizes[n] < screen->menu_font_sizes[m])))
			m = n;
	}
	if (m >= 0) {
		SetVTFont (m, TRUE, NULL, NULL);
	} else {
		Bell(XkbBI_MinorError,0);
	}
}

/* ARGSUSED */
void
HandleSmallerFont(
	Widget w GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	String *params GCC_UNUSED,
	Cardinal *param_count GCC_UNUSED)
{
	TScreen *screen = &term->screen;
	int n, m;

	lookupFontSizes(screen);
	for (n = 0, m = -1; n < NMENUFONTS; n++) {
		if ((screen->menu_font_sizes[n] < screen->menu_font_sizes[screen->menu_font_number])
		 && (screen->menu_font_sizes[n] > 0)
		 && ((m < 0)
		  || (screen->menu_font_sizes[n] > screen->menu_font_sizes[m])))
			m = n;
	}
	if (m >= 0) {
		SetVTFont (m, TRUE, NULL, NULL);
	} else {
		Bell(XkbBI_MinorError,0);
	}
}
#endif

/* ARGSUSED */
void
HandleSetFont(
	Widget w GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	String *params,
	Cardinal *param_count)
{
    int fontnum;
    char *name1 = NULL, *name2 = NULL;

    if (*param_count == 0) {
	fontnum = fontMenu_fontdefault;
    } else {
	Cardinal maxparams = 1;		/* total number of params allowed */

	switch (params[0][0]) {
	  case 'd': case 'D': case '0':
	    fontnum = fontMenu_fontdefault; break;
	  case '1':
	    fontnum = fontMenu_font1; break;
	  case '2':
	    fontnum = fontMenu_font2; break;
	  case '3':
	    fontnum = fontMenu_font3; break;
	  case '4':
	    fontnum = fontMenu_font4; break;
	  case '5':
	    fontnum = fontMenu_font5; break;
	  case '6':
	    fontnum = fontMenu_font6; break;
	  case 'e': case 'E':
	    fontnum = fontMenu_fontescape; maxparams = 3; break;
	  case 's': case 'S':
	    fontnum = fontMenu_fontsel; maxparams = 2; break;
	  default:
	    Bell(XkbBI_MinorError,0);
	    return;
	}
	if (*param_count > maxparams) {	 /* see if extra args given */
	    Bell(XkbBI_MinorError,0);
	    return;
	}
	switch (*param_count) {		/* assign 'em */
	  case 3:
	    name2 = params[2];
	    /* FALLTHRU */
	  case 2:
	    name1 = params[1];
	    break;
	}
    }

    SetVTFont (fontnum, True, name1, name2);
}

void SetVTFont (
	int i,
	Bool doresize,
	char *name1,
	char *name2)
{
    TScreen *screen = &term->screen;

    TRACE(("SetVTFont(i=%d, name1=%s, name2=%s)\n", i,
	name1 ? name1 : "<null>",
	name2 ? name2 : "<null>"))

    if (i >= 0 && i < NMENUFONTS) {
	if (i == fontMenu_fontsel) {	/* go get the selection */
	    FindFontSelection (name1, False);  /* name1 = atom, name2 is ignored */
	    return;
	} else {
	    if (name1 == 0)
		name1 = screen->menu_font_names[i];
	    if (xtermLoadFont(screen, name1, name2, doresize, i)) {
		return;
	    }
	}
    }

    Bell(XkbBI_MinorError,0);
    return;
}
