color.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
/*
*
* Routines that handle color requests passed through as device control commands
* in the form "x X SetColor:red". The following PostScript procedures are needed:
*
* setcolor
*
* mark /color setcolor mark
* mark /color1 /color2 setcolor mark
*
* Called whenever we want to change PostScript's current color graphics
* state parameter. One or two color arguments can be given. In each case
* the colors are looked up in the PostScript colordict dictionary that's
* defined in *colorfile. Two named colors implies reverse video printing
* with the background given in /color2 and the text printed in /color1.
* Unknown colors are mapped into defaults - black for a single color and
* white on black for reverse video.
*
* drawrvbox
*
* leftx rightx drawrvbox -
*
* Fills a box that extends from leftx to rightx with the background color
* that was requested when setcolor set things up for reverse video mode.
* The vertical extent of the box is determined using FontBBox just before
* the first string is printed, and the height remains in effect until
* there's an explicit color change. In otherwords font or size changes
* won't always produce correct result in reverse video mode.
*
* setdecoding
*
* num setdecoding -
*
* Selects the text decoding procedure (ie. what's assigned to PostScript
* procedure t) from the decodingdefs array defined in the prologue. num
* should be the value assigned to variable encoding (in dpost) and will
* remain constant throughout a job, unless special features, like reverse
* video printing, are requested. The text encoding scheme can be set on
* the command line using the -e option. Print time and the size of the
* output file will usually decrease as the value assigned to encoding
* increases.
*
*
* The recognized collection of "x X SetColor:" commands are:
*
* x X SetColor: selects black
* x X SetColor:color selects color
* x X SetColor:color1 on color2 reverse video
* x X SetColor:color1 color2 reverse video again
* x X SetColor:num1 num2 num3 rgb explicit rgb color request
* x X SetColor:num1 num2 num3 hsb explicit hsb color request
*
* In the last three examples num1, num2, and num3 should be numbers between 0 and
* 1 inclusive and are passed on as aguments to the approrpriate PostScript color
* command (eg. setrgbcolor). Unknown color names (ie. the ones that setcolor
* doesn't find in colordict) are mapped into defaults. For one color the default
* is black, while for reverse video it's white text on a black background.
*
* dpost makes sure the current color is maintained across page boundaries, which
* may not be what you want if you're using a macro package like mm that puts out
* page footers and headers. Adding a color request to troff and keeping track of
* the color in each environment may be the best solution.
*
* To get reverse video printing follow the "x X SetColor:" command with two or
* three arguments. "x X SetColor:white on black" or "x X SetColor:white black"
* both produce white text on a black background. Any two colors named in colordict
* (in file *colorfile) can be chosen so "x X SetColor:yellow on blue" also works.
* Each reverse video mode request selects the vertical extent of the background
* box based on the font and size in use just before the first string is printed.
* Font and/or size changes aren't guaranteed to work properly in reverse video
* printing.
*
*/
#include <stdio.h>
#include <ctype.h>
#include "gen.h" /* general purpose definitions */
#include "ext.h" /* external variable definitions */
#define DEFAULTCOLOR "black"
char color[50] = DEFAULTCOLOR; /* current color */
int gotcolor = FALSE; /* TRUE after *colorfile is downloaded */
int wantcolor = FALSE; /* TRUE if we really ask for a color */
/*
*
* All these should be defined in dpost.c.
*
*/
extern int lastend;
extern int encoding;
extern int maxencoding;
extern int realencoding;
extern char *colorfile;
extern FILE *tf;
/*****************************************************************************/
getcolor()
{
/*
*
* Responsible for making sure the PostScript color procedures are downloaded from
* *colorfile. Done at most once per job, and only if the job really uses color.
* For now I've decided not to quit if we can't read the color file.
*
*/
if ( gotcolor == FALSE && access(colorfile, 04) == 0 )
doglobal(colorfile);
if ( tf == stdout )
gotcolor = TRUE;
} /* End of getcolor */
/*****************************************************************************/
newcolor(name)
char *name; /* of the color */
{
char *p; /* next character in *name */
int i; /* goes in color[i] */
/*
*
* Converts *name to lower case and saves the result in color[] for use as the
* current color. The first time something other than DEFAULTCOLOR is requested
* sets wantcolor to TRUE. Characters are converted to lower case as they're put
* in color[] and we quit when we find a newline or get to the end of *name. The
* isupper() test is for Berkley systems.
*
*/
for ( p = name; *p && (*p == ' ' || *p == ':'); p++ ) ;
for ( i = 0; i < sizeof(color) - 1 && *p != '\n' && *p; i++, p++ )
if ( isupper(*p) )
color[i] = tolower(*p);
else color[i] = *p;
if ( i == 0 )
strcpy(color, DEFAULTCOLOR);
else color[i] = '\0';
if ( strcmp(color, DEFAULTCOLOR) != 0 )
wantcolor = TRUE;
} /* End of newcolor */
/*****************************************************************************/
setcolor()
{
int newencoding; /* text encoding scheme that's needed */
char *p; /* for converting what's in color[] */
/*
*
* Sets the color being used by the printer to whatever's stored as the current
* color (ie. the string in color[]). wantcolor is only set to TRUE if we've been
* through newcolor() and asked for something other than DEFAULTCOLOR (probably
* black). While in reverse video mode encoding gets set to maxencoding + 1 in
* dpost and 0 on the printer. Didn't see much point in trying to extend reverse
* video to all the different encoding schemes. realencoding is restored when we
* leave reverse video mode.
*
*/
if ( wantcolor == TRUE ) {
endtext();
getcolor();
lastend = -1;
newencoding = realencoding;
if ( islower(color[0]) == 0 ) /* explicit rgb or hsb request */
fprintf(tf, "%s\n", color);
else {
putc('/', tf);
for ( p = color; *p && *p != ' '; p++ )
putc(*p, tf);
for ( ; *p && *p == ' '; p++ ) ;
if ( strncmp(p, "on ", 3) == 0 ) p += 3;
if ( *p != '\0' ) {
fprintf(tf, " /%s", p);
newencoding = maxencoding + 1;
} /* End if */
fprintf(tf, " setcolor\n");
} /* End else */
if ( newencoding != encoding ) {
encoding = newencoding;
fprintf(tf, "%d setdecoding\n", encoding);
resetpos();
} /* End if */
} /* End if */
} /* End of setcolor */
/*****************************************************************************/