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/*
* pbmtolps -- convert a Portable BitMap into Postscript. The
* output Postscript uses lines instead of the image operator to
* generate a (device dependent) picture which will be imaged
* much faster.
*
* The Postscript path length is constrained to be less that 1000
* points so that no limits are overrun on the Apple Laserwriter
* and (presumably) no other printers.
*
* To do:
* make sure encapsulated format is correct
* repitition of black-white strips
* make it more device independent (is this possible?)
*
* Author:
* George Phillips <phillips@cs.ubc.ca>
* Department of Computer Science
* University of British Columbia
*/
#include <string.h>
#include <stdio.h>
#include "nstring.h"
#include "pbm.h"
static int prev_white = -1;
static int prev_black = -1;
static char cmd = '\0';
static int pointcount = 2;
#ifdef RUN
static int run = 1;
#endif
static char
morepoints(char cmd, int howmany_pbmtolps) {
pointcount += 2;
if (pointcount > 1000) {
pointcount = 2;
cmd += 'm' - 'a';
}
return(cmd);
}
static void
addstrip(int const white,
int const black) {
if (cmd) {
#ifdef RUN
if (white == prev_white && black == prev_black)
run++;
else {
if (run == 1)
#endif
printf("%d %d %c ",
prev_black, prev_white, morepoints(cmd, 2));
#ifdef RUN
else
/* of course, we need to give a new command */
printf("%d %d %d %c ",
prev_white, prev_black, run,
morepoints(cmd + 'f' - 'a', 2 * run));
run = 1;
}
#endif
}
prev_white = white;
prev_black = black;
cmd = 'a';
}
static void
nextline(void) {
/* need to check run, should have an outcommand */
if (cmd)
printf("%d %d %c\n", prev_black, prev_white, morepoints('c', 3));
else
printf("%c\n", morepoints('b', 1));
cmd = '\0';
}
int
main(int argc, char ** argv) {
FILE* fp;
bit* bits;
int row;
int col;
int rows;
int cols;
int format;
int white;
int black;
const char* name;
float dpi = 300.0;
float sc_rows;
float sc_cols;
int i;
const char* const usage = "[ -dpi n ] [ pbmfile ]";
pbm_init(&argc, argv);
i = 1;
if (i < argc && streq(argv[i], "-dpi")) {
if (i == argc - 1)
pm_usage(usage);
sscanf(argv[i + 1], "%f", &dpi);
i += 2;
}
if (i < argc - 1)
pm_usage(usage);
if (i == argc) {
name = "noname";
fp = stdin;
} else {
name = argv[i];
fp = pm_openr(name);
}
pbm_readpbminit(fp, &cols, &rows, &format);
bits = pbm_allocrow(cols);
sc_rows = (float)rows / dpi * 72.0;
sc_cols = (float)cols / dpi * 72.0;
puts("%!PS-Adobe-2.0 EPSF-2.0");
puts("%%Creator: pbmtolps");
printf("%%%%Title: %s\n", name);
printf("%%%%BoundingBox: %d %d %d %d\n",
(int)(305.5 - sc_cols / 2.0),
(int)(395.5 - sc_rows / 2.0),
(int)(306.5 + sc_cols / 2.0),
(int)(396.5 + sc_rows / 2.0));
puts("%%EndComments");
puts("%%EndProlog");
puts("gsave");
printf("%f %f translate\n", 306.0 - sc_cols / 2.0, 396.0 + sc_rows / 2.0);
printf("72 %f div dup neg scale\n", dpi);
puts("/a { 0 rmoveto 0 rlineto } def");
puts("/b { 0 row 1 add dup /row exch def moveto } def");
puts("/c { a b } def");
puts("/m { currentpoint stroke newpath moveto a } def");
puts("/n { currentpoint stroke newpath moveto b } def");
puts("/o { currentpoint stroke newpath moveto c } def");
puts("/row 0 def");
puts("newpath 0 0 moveto");
for (row = 0; row < rows; row++) {
pbm_readpbmrow(fp, bits, cols, format);
/* output white-strip+black-strip sequences */
for (col = 0; col < cols; ) {
for (white = 0; col < cols && bits[col] == PBM_WHITE; col++)
white++;
for (black = 0; col < cols && bits[col] == PBM_BLACK; col++)
black++;
if (black != 0)
addstrip(white, black);
}
nextline();
}
puts("stroke grestore showpage");
puts("%%Trailer");
pm_close(fp);
exit(0);
}
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