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/*
* This is a set of routines for dvips that are used to process color
* commands in the TeX file (passed by \special commands). This was
* orignally written by J. Hafner, E. Blanz and M. Flickner of IBM
* Research, Almaden Research Center. Contact hafner@almaden.ibm.com.
* And then it was completely rewritten by Tomas Rokicki to:
*
* - Be easier on the memory allocator (malloc/free)
* - Use less memory overall (by a great deal) and be faster
* - Work with the -C, -a, and other options
* - Be more adaptable to other drivers and previewers.
*
* The motivating idea: we want to be able to process 5,000 page
* documents using lots of colors on each page on a 640K IBM PC
* relatively quickly.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
#include <stdio.h>
/*
* The external declarations:
*/
#include "protos.h"
/*
* Here we set some limits on some color stuff.
*/
#define COLORHASH (89)
#define MAXCOLORLEN (120) /* maximum color length for background */
#define INITCOLORLEN (10000) /* initial stack size in chars */
/*
* This is where we store the color information for a particular page.
* If we free all of these, we free all of the allocated color
* stuff; we do no allocations (but one) other than when we allocate
* these.
*/
static struct colorpage {
struct colorpage *next;
integer boploc; /* we use the bop loc as a page indicator */
char *bg;
char colordat[2];
} *colorhash[COLORHASH];
static char *cstack, *csp, *cend, *bg;
/*
* This routine sends a color command out. If the command is a
* single `word' or starts with a double quote, we send it out
* exactly as is (except for any double quote.) If the command
* is a word followed by arguments, we send out the arguments and
* then the word prefixed by "TeXcolor".
*/
static void
colorcmdout(char *s)
{
char *p;
char tempword[100];
while (*s && *s <= ' ')
s++;
if (*s == '"') {
cmdout(s+1);
return;
}
for (p=s; *p && *p > ' '; p++);
for (; *p && *p <= ' '; p++);
if (*p == 0) {
cmdout(s);
return;
}
cmdout(p);
strcpy(tempword, "TeXcolor");
for (p=tempword + strlen(tempword); *s && *s > ' '; p++, s++)
*p = *s;
*p = 0;
cmdout(tempword);
return;
}
/*
* For a new dvi file, call this. Frees all allocated memory.
*/
#define DEFAULTCOLOR "Black"
void initcolor(void) {
int i;
struct colorpage *p, *q;
for (i=0; i<COLORHASH; i++) {
for (p=colorhash[i]; p; p = q) {
q = p->next;
free(p);
}
colorhash[i] = 0;
}
cstack = (char *)mymalloc(INITCOLORLEN);
strcpy(cstack, "\n");
strcat(cstack, DEFAULTCOLOR);
csp = cstack + strlen(cstack);
cend = cstack + INITCOLORLEN - 3; /* for conservativeness */
bg = 0;
}
/*
* This takes a call from predospecial to set the background color for
* the current page. It is saved in stackdepth and backed down the
* stack during popcolors.
*/
void
background(char *bkgrnd)
{
if (bkgrnd && *bkgrnd) {
if (strlen(bkgrnd) > MAXCOLORLEN)
error(" color name too long; ignored");
else
strcpy(bg, bkgrnd);
}
}
/*
* This routine puts a call from \special for color on the colorstack
* and sets the color in the PostScript.
*/
void
pushcolor(char *p, Boolean outtops)
{
while (strlen(p) + csp > cend) {
int newlen = 3 * (cend - cstack);
char *newcs = (char *)mymalloc(newlen);
strcpy(newcs, cstack);
csp = newcs + (csp - cstack);
cend = newcs + newlen - 3;
cstack = newcs;
}
*csp++ = '\n';
strcpy(csp, p);
csp += strlen(p);
if (outtops) {
colorcmdout(p);
}
}
/*
* This routine removes a color from the colorstack and resets the color
* in the PostScript to the previous color.
*/
void
popcolor(Boolean outtops)
{
char *p = csp - 1;
while (p >= cstack && *p != '\n')
p--;
if (p == cstack)
return; /* We don't pop the last color as that is global */
*p = 0;
csp = p;
for (p--; p >= cstack && *p != '\n'; p--);
p++;
if ( outtops ) {
colorcmdout(p);
}
}
/*
* This routine clears the colorstack, pushes a new color onto the stack
* (this is now the root or global color).
*/
void
resetcolorstack(char * p, int outtops)
{
char *q = csp - 1;
while (q > cstack && *q != '\n')
q--;
if (q > cstack && outtops == 0) {
#ifdef SHORTINT
fprintf(stderr, "You've mistakenly made a global color change ");
fprintf(stderr, "to %s within nested colors\n", p);
fprintf(stderr, "on page %ld. Will try to recover.\n", pagenum);
#else /* ~SHORTINT */
fprintf(stderr, "You've mistakenly made a global color change ");
fprintf(stderr, "to %s within nested colors\n", p);
fprintf(stderr, "on page %d. Will try to recover.\n", pagenum);
#endif /* ~SHORTINT */
}
csp = cstack;
*csp = 0;
pushcolor(p, outtops);
}
/*
* This routine is a bit magic. It looks up the page in the current
* hash table. If the page is already entered in the hash table, then
* it restores the color to what that page had, and sets the last
* color. This will occur if this is not the first time that this
* page has been encountered.
*
* If, on the other hand, this is the first time that the page has
* been encountered, then it will create a new hash entry and copy the
* current color information into it. Since we can only encounter a
* new page after having just finished scanning the previous page,
* this is safe.
*/
void
bopcolor(int outtops)
{
integer pageloc = ftell(dvifile);
int h = pageloc % COLORHASH;
struct colorpage *p = colorhash[h];
while (p) {
if (p->boploc == pageloc)
break;
else
p = p->next;
}
if (p) {
strcpy(cstack, p->colordat);
csp = cstack + strlen(cstack);
bg = p->bg;
if (outtops && strcmp(bg, "White")!=0 && bg[0]) {
cmdout("gsave");
colorcmdout(bg);
cmdout("clippath fill grestore");
}
} else {
p = (struct colorpage *)mymalloc((integer)
(strlen(cstack) + sizeof(struct colorpage) + MAXCOLORLEN));
p->next = colorhash[h];
p->boploc = pageloc;
strcpy(p->colordat, cstack);
p->bg = p->colordat + strlen(cstack) + 1;
if (bg)
strcpy(p->bg, bg);
else
*(p->bg) = 0;
bg = p->bg;
colorhash[h] = p;
}
if (outtops) {
char *pp = csp - 1;
while (pp >= cstack && *pp != '\n')
pp--;
pp++;
if (strcmp(pp, DEFAULTCOLOR)!=0) {
colorcmdout(pp);
}
}
}
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