/*
* The font parser for the BDF files
*
* Copyright (c) 2001 by the TTF2PT1 project
* Copyright (c) 2001 by Sergey Babkin
*
* see COPYRIGHT for the full copyright notice
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "pt1.h"
#include "global.h"
/* prototypes of call entries */
static void openfont(char *fname, char *arg);
static void closefont( void);
static int getnglyphs ( void);
static int glnames( GLYPH *glyph_list);
static void readglyphs( GLYPH *glyph_list);
static int glenc( GLYPH *glyph_list, int *encoding, int *unimap);
static void fnmetrics( struct font_metrics *fm);
static void glpath( int glyphno, GLYPH *glyph_list);
static void kerning( GLYPH *glyph_list);
/* globals */
/* front-end descriptor */
struct frontsw bdf_sw = {
/*name*/ "bdf",
/*descr*/ "BDF bitmapped fonts",
/*suffix*/ { "bdf" },
/*open*/ openfont,
/*close*/ closefont,
/*nglyphs*/ getnglyphs,
/*glnames*/ glnames,
/*glmetrics*/ readglyphs,
/*glenc*/ glenc,
/*fnmetrics*/ fnmetrics,
/*glpath*/ glpath,
/*kerning*/ kerning,
};
/* statics */
#define MAXLINE 10240 /* maximal line length in the input file */
static int lineno; /* line number */
#define GETLEN(s) s, (sizeof(s)-1)
#define LENCMP(str, txt) strncmp(str, txt, sizeof(txt)-1)
static FILE *bdf_file;
static int nglyphs;
static struct font_metrics fmet;
/* many BDF fonts are of small pixel size, so we better try
* to scale them by an integer to keep the dimensions in
* whole pixels. However if the size is too big and a non-
* integer scaling is needed, we use the standard ttf2pt1's
* scaling abilities.
*/
static int pixel_size;
static int scale;
static int scale_external;
static char *slant;
static char xlfdname[201];
static char *spacing;
static char *charset_reg;
static char *charset_enc;
static char *fnwidth;
static int is_unicode = 0;
/* tempoary storage for returning data to ttf2pt1 later on request */
static int maxenc = 0;
static int *fontenc;
static GENTRY **glpaths;
static int got_glyphs = 0;
static GLYPH *glyphs;
static int curgl;
static int readfile(FILE *f, int (*strfunc)(int len, char *str));
/*
* Read the file and parse each string with strfunc(),
* until strfunc() returns !=0 or the end of file happens.
* Returns -1 on EOF or strfunc() returning <0, else 0
*/
static int
readfile(
FILE *f,
int (*strfunc)(int len, char *str)
)
{
static char str[MAXLINE]; /* input line, maybe should be dynamic ? */
char *s;
int len, c, res;
len=0;
while(( c=getc(f) )!=EOF) {
if(c=='\n') {
str[len]=0;
res = strfunc(len, str);
lineno++;
if(res<0)
return -1;
else if(res!=0)
return 0;
len=0;
} else if(len<MAXLINE-1) {
if(c!='\r')
str[len++]=c;
} else {
fprintf(stderr, "**** bdf: line %d is too long (>%d)\n", lineno, MAXLINE-1);
exit(1);
}
}
return -1; /* EOF */
}
/*
* Parse the header of the font file.
* Stop after the line CHARS is encountered. Ignore the unknown lines.
*/
struct line {
char *name; /* property name with trailing space */
int namelen; /* length of the name string */
enum {
ALLOW_REPEAT = 0x01, /* this property may be repeated in multiple lines */
IS_SEEN = 0x02, /* this property has been seen already */
MUST_SEE = 0x04, /* this property must be seen */
IS_LAST = 0x08 /* this is the last property to be read */
} flags;
char *fmt; /* format string for the arguments, NULL means a string arg */
int nvals; /* number of values to be read by sscanf */
void *vp[4]; /* pointers to values to be read */
};
static struct line header[] = {
{ GETLEN("FONT "), 0, " %200s", 1, {&xlfdname} },
{ GETLEN("SIZE "), MUST_SEE, " %d", 1, {&pixel_size} },
{ GETLEN("FONTBOUNDINGBOX "), MUST_SEE, " %hd %hd %hd %hd", 4,
{&fmet.bbox[2], &fmet.bbox[3], &fmet.bbox[0], &fmet.bbox[1]} },
{ GETLEN("FAMILY_NAME "), MUST_SEE, NULL, 1, {&fmet.name_family} },
{ GETLEN("WEIGHT_NAME "), MUST_SEE, NULL, 1, {&fmet.name_style} },
{ GETLEN("COPYRIGHT "), 0, NULL, 1, {&fmet.name_copyright} },
{ GETLEN("SLANT "), MUST_SEE, NULL, 1, {&slant} },
{ GETLEN("SPACING "), 0, NULL, 1, {&spacing} },
{ GETLEN("SETWIDTH_NAME "), 0, NULL, 1, {&fnwidth} },
{ GETLEN("CHARSET_REGISTRY "), 0, NULL, 1, {&charset_reg} },
{ GETLEN("CHARSET_ENCODING "), 0, NULL, 1, {&charset_enc} },
{ GETLEN("FONT_ASCENT "), 0, " %hd", 1, {&fmet.ascender} },
{ GETLEN("FONT_DESCENT "), 0, " %hd", 1, {&fmet.descender} },
/* these 2 must go in this order for post-processing */
{ GETLEN("UNDERLINE_THICKNESS "), 0, " %hd", 1, {&fmet.underline_thickness} },
{ GETLEN("UNDERLINE_POSITION "), 0, " %hd", 1, {&fmet.underline_position} },
{ GETLEN("CHARS "), MUST_SEE|IS_LAST, " %d", 1, {&nglyphs} },
{ NULL, 0, 0 } /* end mark: name==NULL */
};
static int
handle_header(
int len,
char *str
)
{
struct line *cl;
char *s, *p;
char bf[2000];
int c;
#if 0
fprintf(stderr, "line: %s\n", str);
#endif
for(cl = header; cl->name != 0; cl++) {
if(strncmp(str, cl->name, cl->namelen))
continue;
#if 0
fprintf(stderr, "match: %s\n", cl->name);
#endif
if(cl->flags & IS_SEEN) {
if(cl->flags & ALLOW_REPEAT)
continue;
fprintf(stderr, "**** input line %d redefines the property %s\n", lineno, cl->name);
exit(1);
}
cl->flags |= IS_SEEN;
if(cl->fmt == 0) {
if(len - cl->namelen + 1 > sizeof bf)
len = sizeof bf; /* cut it down */
s = bf; /* a temporary buffer to extract the value */
/* skip until a quote */
for(p = str+cl->namelen; len!=0 && (c = *p)!=0; p++, len--) {
if(c == '"') {
p++;
break;
}
}
for(; len!=0 && (c = *p)!=0; p++, len--) {
if(c == '"') {
c = *++p;
if(c == '"')
*s++ = c;
else
break;
} else
*s++ = c;
}
*s = 0; /* end of line */
*((char **)(cl->vp[0])) = dupcnstring(bf, s-bf);
} else {
c = sscanf(str+cl->namelen, cl->fmt, cl->vp[0], cl->vp[1], cl->vp[2], cl->vp[3]);
if(c != cl->nvals) {
fprintf(stderr, "**** property %s at input line %d must have %d arguments\n",
cl->name, lineno, cl->nvals);
exit(1);
}
}
if(cl->flags & IS_LAST)
return 1;
else
return 0;
}
return 0;
}
/*
* Parse the description of the glyphs
*/
static int
handle_glyphs(
int len,
char *str
)
{
static int inbmap=0;
static char *bmap;
static int xsz, ysz, xoff, yoff;
static int curln;
int i, c;
char *p, *plim, *psz;
if(!LENCMP(str, "ENDFONT")) {
if(curgl < nglyphs) {
fprintf(stderr, "**** unexpected end of font file after %d glyphs\n", curgl);
exit(1);
} else
return 1;
}
if(curgl >= nglyphs) {
fprintf(stderr, "**** file contains more glyphs than advertised (%d)\n", nglyphs);
exit(1);
}
if(!LENCMP(str, "STARTCHAR")) {
/* sizeof will count \0 instead of ' ' */
for(i=sizeof("STARTCHAR"); str[i] == ' '; i++)
{}
glyphs[curgl].name = strdup(str + i);
if(glyphs[curgl].name == 0) {
fprintf (stderr, "****malloc failed %s line %d\n", __FILE__, __LINE__);
exit(255);
}
} else if(!LENCMP(str, "ENCODING")) {
if(sscanf(str, "ENCODING %d", &fontenc[curgl])!=1) {
fprintf(stderr,"**** weird ENCODING statement at line %d\n", lineno);
exit(1);
}
if(fontenc[curgl] == -1) /* compatibility format */
sscanf(str, "ENCODING -1 %d", &fontenc[curgl]);
if(fontenc[curgl] > maxenc)
maxenc = fontenc[curgl];
} else if(!LENCMP(str, "DWIDTH")) {
if(sscanf(str, "DWIDTH %d %d", &xsz, &ysz)!=2) {
fprintf(stderr,"**** weird DWIDTH statement at line %d\n", lineno);
exit(1);
}
glyphs[curgl].width = xsz*scale;
} else if(!LENCMP(str, "BBX")) {
if(sscanf(str, "BBX %d %d %d %d", &xsz, &ysz, &xoff, &yoff)!=4) {
fprintf(stderr,"**** weird BBX statement at line %d\n", lineno);
exit(1);
}
bmap=malloc(xsz*ysz);
if(bmap==0) {
fprintf (stderr, "****malloc failed %s line %d\n", __FILE__, __LINE__);
exit(255);
}
glyphs[curgl].lsb = -xoff*scale;
glyphs[curgl].xMin = -xoff*scale;
glyphs[curgl].xMax = (xsz-xoff)*scale;
glyphs[curgl].yMin = -yoff*scale;
glyphs[curgl].yMax = (ysz-xoff)*scale;
} else if(!LENCMP(str, "BITMAP")) {
inbmap=1;
curln=ysz-1; /* the lowest line has index 0 */
} else if(!LENCMP(str, "ENDCHAR")) {
inbmap=0;
if(bmap) {
glyphs[curgl].lastentry = 0;
glyphs[curgl].path = 0;
glyphs[curgl].entries = 0;
bmp_outline(&glyphs[curgl], scale, bmap, xsz, ysz, xoff, yoff);
free(bmap);
/* remember in a static table or it will be erased */
glpaths[curgl] = glyphs[curgl].entries;
glyphs[curgl].entries = 0;
if(glpaths[curgl])
glyphs[curgl].ttf_pathlen = 1;
else
glyphs[curgl].ttf_pathlen = 0;
}
curgl++;
} else if(inbmap) {
if(curln<0) {
fprintf(stderr,"**** bitmap is longer than %d lines at line %d\n", ysz, lineno);
exit(1);
}
i=0;
p=&bmap[curln*xsz]; psz=p+xsz;
while(i<len) {
c=str[i++];
if(!isxdigit(c)) {
fprintf(stderr,"**** non-hex digit in bitmap at line %d\n", lineno);
exit(1);
}
if(c<='9')
c-='0';
else
c= tolower(c)-'a'+10;
for(plim=p+4; p<psz && p<plim; c<<=1)
*p++ = (( c & 0x08 )!=0);
}
if(p<psz) {
fprintf(stderr,"**** bitmap line is too short at line %d\n", lineno);
exit(1);
}
curln--;
}
return 0;
}
/*
* Read all the possible information about the glyphs
*/
static void
readglyphs(
GLYPH *glyph_list
)
{
int i;
GLYPH *g;
if(got_glyphs)
return;
/* pass them to handle_glyphs() through statics */
glyphs = glyph_list;
curgl = 2; /* skip the empty glyph and .notdef */
/* initialize the empty glyph and .notdef */
for(i=0; i<2; i++) {
g = &glyphs[i];
g->lsb = 0;
g->width = fmet.bbox[2];
g->xMin = 0;
g->yMin = 0;
}
g = &glyphs[0];
g->name = ".notdef";
g->xMax = fmet.bbox[2]*4/5;
g->yMax = fmet.bbox[3]*4/5;
g->entries = g->path = g->lastentry = 0;
/* make it look as a black square */
fg_rmoveto(g, 0.0, 0.0);
fg_rlineto(g, 0.0, (double)g->yMax);
fg_rlineto(g, (double)g->xMax, (double)g->yMax);
fg_rlineto(g, (double)g->xMax, 0.0);
fg_rlineto(g, 0.0, 0.0);
g_closepath(g);
glpaths[0] = g->entries;
g->entries = 0;
g->ttf_pathlen = 4;
g = &glyphs[1];
g->name = ".null";
g->xMax = g->yMax = 0;
g->ttf_pathlen = 0;
if(readfile(bdf_file, handle_glyphs) < 0) {
fprintf(stderr, "**** file does not contain the ENDFONT line\n");
exit(1);
}
got_glyphs = 1;
}
/*
* Open font and prepare to return information to the main driver.
* May print error and warning messages.
* Exit on error.
*/
static void
openfont(
char *fname,
char *arg /* unused now */
)
{
struct line *cl;
int i, l;
if ((bdf_file = fopen(fname, "r")) == NULL) {
fprintf(stderr, "**** Cannot open file '%s'\n", fname);
exit(1);
} else {
WARNING_2 fprintf(stderr, "Processing file %s\n", fname);
}
lineno = 1;
for(cl = header; cl->name != 0; cl++)
cl->flags &= ~IS_SEEN;
if(readfile(bdf_file, handle_header) < 0) {
fprintf(stderr, "**** file does not contain the CHARS definition\n");
exit(1);
}
for(cl = header; cl->name != 0; cl++) {
if( (cl->flags & MUST_SEE) && !(cl->flags & IS_SEEN) ) {
fprintf(stderr, "**** mandatory property %sis not found in the input line\n",
cl->name); /* cl->name has a space at the end */
exit(1);
}
/* set a few defaults */
if( !(cl->flags & IS_SEEN) ) {
if(cl->vp[0] == &fmet.underline_thickness) {
fmet.underline_thickness = 1;
} else if(cl->vp[0] == &fmet.underline_position) {
fmet.underline_position = fmet.bbox[1] + fmet.underline_thickness
- (pixel_size - fmet.bbox[3]);
} else if(cl->vp[0] == &fmet.ascender) {
fmet.ascender = fmet.bbox[2] + fmet.bbox[0];
} else if(cl->vp[0] == &fmet.descender) {
fmet.descender = fmet.bbox[0];
}
}
}
nglyphs += 2; /* add empty glyph and .notdef */
/* postprocessing to compensate for the differences in the metric formats */
fmet.bbox[2] += fmet.bbox[0];
fmet.bbox[3] += fmet.bbox[1];
scale = 1000/pixel_size; /* XXX ? */
if(scale*pixel_size < 950) {
scale = 1;
scale_external = 1;
fmet.units_per_em = pixel_size;
} else {
scale_external = 0;
fmet.units_per_em = scale*pixel_size;
fmet.underline_position *= scale;
fmet.underline_thickness *= scale;
fmet.ascender *= scale;
fmet.descender *= scale;
for(i=0; i<4; i++)
fmet.bbox[i] *= scale;
}
fmet.italic_angle = 0.0;
if(spacing == 0 /* possibly an old font */
|| toupper(spacing[0]) != 'P') /* or anything non-proportional */
fmet.is_fixed_pitch = 1;
else
fmet.is_fixed_pitch = 0;
if(fmet.name_copyright==NULL)
fmet.name_copyright = "";
/* create the full name */
l = strlen(fmet.name_family)
+ (fmet.name_style? strlen(fmet.name_style) : 0)
+ (fnwidth? strlen(fnwidth) : 0)
+ strlen("Oblique") + 1;
if(( fmet.name_full = malloc(l) )==NULL) {
fprintf (stderr, "****malloc failed %s line %d\n", __FILE__, __LINE__);
exit(255);
}
strcpy(fmet.name_full, fmet.name_family);
if(fnwidth && strcmp(fnwidth, "Normal")) {
strcat(fmet.name_full, fnwidth);
}
if(fmet.name_style && strcmp(fmet.name_style, "Medium")) {
strcat(fmet.name_full, fmet.name_style);
}
switch(toupper(slant[0])) {
case 'O':
strcat(fmet.name_full, "Oblique");
break;
case 'I':
strcat(fmet.name_full, "Italic");
break;
}
fmet.name_ps = fmet.name_full;
fmet.name_version = "1.0";
if(charset_reg && charset_enc
&& !strcmp(charset_reg, "iso10646") && !strcmp(charset_enc, "1"))
is_unicode = 1;
if(( fontenc = calloc(nglyphs, sizeof *fontenc) )==NULL) {
fprintf (stderr, "****malloc failed %s line %d\n", __FILE__, __LINE__);
exit(255);
}
for(i=0; i<nglyphs; i++)
fontenc[i] = -1;
if(( glpaths = calloc(nglyphs, sizeof *glpaths) )==NULL) {
fprintf (stderr, "****malloc failed %s line %d\n", __FILE__, __LINE__);
exit(255);
}
}
/*
* Close font.
* Exit on error.
*/
static void
closefont(
void
)
{
if(fclose(bdf_file) < 0) {
WARNING_1 fprintf(stderr, "Errors when closing the font file, ignored\n");
}
}
/*
* Get the number of glyphs in font.
*/
static int
getnglyphs (
void
)
{
return nglyphs;
}
/*
* Get the names of the glyphs.
* Returns 0 if the names were assigned, non-zero if the font
* provides no glyph names.
*/
static int
glnames(
GLYPH *glyph_list
)
{
readglyphs(glyph_list);
return 0;
}
/*
* Get the original encoding of the font.
* Returns 1 for if the original encoding is Unicode, 2 if the
* original encoding is other 16-bit, 0 if 8-bit.
*/
static int
glenc(
GLYPH *glyph_list,
int *encoding,
int *unimap
)
{
int i, douni, e;
if(is_unicode || forcemap)
douni = 1;
else
douni = 0;
for(i=0; i<nglyphs; i++) {
e = fontenc[i];
if(douni)
e = unicode_rev_lookup(e);
if(e>=0 && e<ENCTABSZ && encoding[e] == -1)
encoding[e] = i;
}
if(is_unicode)
return 1;
else if(maxenc > 255)
return 2;
else
return 0;
}
/*
* Get the font metrics
*/
static void
fnmetrics(
struct font_metrics *fm
)
{
*fm = fmet;
}
/*
* Get the path of contrours for a glyph.
*/
static void
glpath(
int glyphno,
GLYPH *glyf_list
)
{
readglyphs(glyf_list);
glyf_list[glyphno].entries = glpaths[glyphno];
glpaths[glyphno] = 0;
}
/*
* Get the kerning data.
*/
static void
kerning(
GLYPH *glyph_list
)
{
return; /* no kerning in BDF */
}
|
Download
