V10/cmd/post.src/dpost/dpost.h

/*
 *
 * DEVNAME should be the name of a device whose font files accurately describe
 * what's available on the target printer. It's a string that's combined with
 * "/usr/lib/font/dev" to locate the final font directory. It can be changed
 * using the -T option, but you may end up getting garbage - the character code
 * field must agree with PostScript's character encoding scheme for each font and
 * troff's one or two character font names must be mapped into the appropriate
 * PostScript font names (typically in the prologue)
 *
 *
 */

#define	DEVNAME		"post"		/* name of the target printer */

/*
 *
 * SLOP controls how much horizontal positioning error we'll accept and primarily
 * helps when we're emulating another device. It's used when we output characters
 * in oput() to check if troff and the printer have gotten too far out of sync.
 * Given in units of points and can be changed using the -S option. Converted to
 * machine units in t_init() after the resolution is known.
 *
 */

#define SLOP		.2		/* horizontal error - in points */

/*
 *
 * Several different text line encoding schemes are supported. Print time should
 * decrease as the value assigned to encoding (in dpost.c) increases, although the
 * only encoding that's well tested is the lowest level one, which produces output
 * essentially identical to the original version of dpost. Setting DFLTENCODING to
 * 0 will give you the most stable (but slowest) encoding. The encoding scheme can
 * also be set on the command line using the -e option. Faster methods are based
 * on widthshow and may not place words exactly where troff wanted, but errors will
 * usually not be noticeable.
 *
 */

#define MAXENCODING	3

#ifndef DFLTENCODING
#define DFLTENCODING	2
#endif

/*
 *
 * The encoding scheme controls how lines of text are output. In the lower level
 * schemes words and horizontal positions are put on the stack as they're read and
 * when they're printed it's done in reverse order - the first string printed is
 * the one on top of the stack and it's the last one on the line. Faster methods
 * may be forced to reverse the order of strings on the stack, making the top one
 * the first string on the line. STRINGSPACE sets the size of a character array
 * that's used to save the strings that make up  a line of text so they can be
 * output in reverse order or perhaps combined in groups for widthshow.
 *
 * MAXSTACK controls how far we let PostScript's operand stack grow and determines
 * the number of strings we'll save before printing all or part of a line of text.
 * The internal limit in PostScript printers built by Adobe is 500, so MAXSTACK
 * should never be bigger than about 240!
 *
 * Line is a structure used to keep track of the words (or rather strings) on the
 * current line that have been read but not printed. dx is the width troff wants
 * to use for a space in the current string. start is where the string began, width
 * is the total width of the string, and spaces is the number of space characters
 * in the current string. *str points to the start of the string in the strings[]
 * array. The Line structure is only used in the higher level encoding schemes.
 * 
 */

#define	MAXSTACK	50		/* most strings we'll save at once */
#define	STRINGSPACE	2000		/* bytes available for string storage */

typedef struct {
	char	*str;			/* where the string is stored */
	int	dx;			/* width of a space */
	int	spaces;			/* number of space characters */
	int	start;			/* horizontal starting position */
	int	width;			/* and its total width */
} Line;

/*
 *
 * Simple stuff used to map unrecognized font names into something reasonable. The
 * mapping array is initialized using FONTMAP and used in loadfont() whenever the
 * job tries to use a font that we don't recognize. Normally only needed when we're
 * emulating another device.
 *
 */

typedef struct {
	char	*name;			/* font name we're looking for */
	char	*use;			/* and this is what we should use */
} Fontmap;

#define	FONTMAP								\
									\
	{								\
	    "G", "H",							\
	    "LO", "S",							\
	    "S2", "S",							\
	    "GI", "HI",							\
	    "HM", "H",							\
	    "HK", "H",							\
	    "HL", "H",							\
	    "PA", "R",							\
	    "PI", "I",							\
	    "PB", "B",							\
	    "PX", "BI",							\
	    NULL, NULL,							\
	}

/*
 *
 * Non-integer valued functions.
 *
 */

extern char	*mapfont();