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/* writetype0.c
Copyright 2006-2008 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#include "ptexlib.h"
#include "writettf.h"
#include "writecff.h"
#include "sfnt.h"
#include "tt_glyf.h"
static const char _svn_version[] =
"$Id: writetype2.c 1783 2009-01-18 12:51:01Z oneiros $ $URL: http://scm.foundry.supelec.fr/svn/luatex/trunk/src/texk/web2c/luatexdir/font/writetype2.c $";
/* forward*/
void make_tt_subset(fd_entry * fd, unsigned char *buffer, integer buflen);
unsigned long cidtogid_obj = 0;
/* low-level helpers */
#define test_loc(l) \
if ((f->loc+l)>f->buflen) { \
fprintf (stderr,"File ended prematurely\n"); \
uexit(1); \
}
BYTE get_unsigned_byte(sfnt * f)
{
test_loc(1);
return (BYTE) f->buffer[(f->loc++)];
};
ICHAR get_signed_byte(sfnt * f)
{
test_loc(1);
return (ICHAR) f->buffer[(f->loc++)];
};
USHORT get_unsigned_pair(sfnt * f)
{
USHORT l;
test_loc(2);
l = f->buffer[(f->loc++)];
l = l * 0x100 + f->buffer[(f->loc++)];
return l;
};
SHORT get_signed_pair(sfnt * f)
{
long l;
test_loc(2);
l = f->buffer[(f->loc++)];
if (l > 0x80)
l -= 0x100;
l = l * 0x100 + f->buffer[(f->loc++)];
return l;
};
ULONG get_unsigned_quad(sfnt * f)
{
ULONG l;
test_loc(4);
l = f->buffer[(f->loc++)];
l = l * 0x100 + f->buffer[(f->loc++)];
l = l * 0x100 + f->buffer[(f->loc++)];
l = l * 0x100 + f->buffer[(f->loc++)];
return l;
};
int do_sfnt_read(unsigned char *dest, int len, sfnt * f)
{
int i;
test_loc(len);
for (i = 0; i < len; i++) {
*(dest + i) = f->buffer[f->loc + i];
}
f->loc += len;
return len;
};
pdf_obj *pdf_new_stream(void)
{
pdf_obj *stream = xmalloc(sizeof(pdf_obj));
stream->length = 0;
stream->data = NULL;
return stream;
};
void pdf_add_stream(pdf_obj * stream, unsigned char *buf, long len)
{
int i;
assert(stream != NULL);
if (stream->data == NULL) {
stream->data = xmalloc(len);
} else {
stream->data = xrealloc(stream->data, len + stream->length);
}
for (i = 0; i < len; i++) {
*(stream->data + stream->length + i) = *(buf + i);
}
stream->length += len;
};
void pdf_release_obj(pdf_obj * stream)
{
if (stream != NULL) {
if (stream->data != NULL) {
xfree(stream->data);
}
xfree(stream);
}
};
void writetype2(fd_entry * fd)
{
int callback_id;
int file_opened = 0;
char *ftemp = NULL;
glyph_tab = NULL;
fd_cur = fd; /* fd_cur is global inside writettf.c */
assert(fd_cur->fm != NULL);
assert(is_truetype(fd_cur->fm));
if (!is_subsetted(fd_cur->fm)) {
writettf(fd);
return;
}
assert(is_included(fd_cur->fm));
set_cur_file_name(fd_cur->fm->ff_name);
ttf_curbyte = 0;
ttf_size = 0;
callback_id = callback_defined(find_opentype_file_callback);
if (callback_id > 0) {
if (run_callback
(callback_id, "S->S", (char *) (nameoffile + 1), &ftemp)) {
if (ftemp != NULL && strlen(ftemp)) {
free(nameoffile);
namelength = strlen(ftemp);
nameoffile = xmalloc(namelength + 2);
strcpy((char *) (nameoffile + 1), ftemp);
free(ftemp);
}
}
}
callback_id = callback_defined(read_opentype_file_callback);
if (callback_id > 0) {
if (run_callback(callback_id, "S->bSd", (char *) (nameoffile + 1),
&file_opened, &ttf_buffer, &ttf_size) &&
file_opened && ttf_size > 0) {
} else {
pdftex_fail("cannot open OpenType font file for reading");
}
} else {
if (!otf_open()) {
pdftex_fail("cannot open OpenType font file for reading");
}
ttf_read_file();
ttf_close();
}
cur_file_name = (char *) nameoffile + 1;
fd_cur->ff_found = true;
if (tracefilenames) {
if (is_subsetted(fd_cur->fm))
tex_printf("<%s", cur_file_name);
else
tex_printf("<<%s", cur_file_name);
}
/* here is the real work */
make_tt_subset(fd, ttf_buffer, ttf_size);
/*xfree (dir_tab); */
xfree(ttf_buffer);
if (tracefilenames) {
if (is_subsetted(fd_cur->fm))
tex_printf(">");
else
tex_printf(">>");
}
cur_file_name = NULL;
}
/*
* PDF viewer applications use following tables (CIDFontType 2)
*
* head, hhea, loca, maxp, glyf, hmtx, fpgm, cvt_, prep
*
* - from PDF Ref. v.1.3, 2nd ed.
*
* The fpgm, cvt_, and prep tables appears only when TrueType instructions
* requires them. Those tables must be preserved if they exist.
* We use must_exist flag to indicate `preserve it if present'
* and to make sure not to cause an error when it does not exist.
*
* post and name table must exist in ordinary TrueType font file,
* but when a TrueType font is converted to CIDFontType 2 font, those tables
* are no longer required.
*
* The OS/2 table (required for TrueType font for Windows and OS/2) contains
* liscencing information, but PDF viewers seems not using them.
*
* The 'name' table added. See comments in ttf.c.
*/
static struct {
const char *name;
int must_exist;
} required_table[] = {
{
"OS/2", 0}, {
"cmap", 0}, {
"head", 1}, {
"hhea", 1}, {
"loca", 1}, {
"maxp", 1}, {
"name", 1}, {
"glyf", 1}, {
"hmtx", 1}, {
"fpgm", 0}, {
"cvt ", 0}, {
"prep", 0}, {
NULL, 0}
};
unsigned long ttc_read_offset(sfnt * sfont, int ttc_idx)
{
long version;
unsigned long offset = 0;
unsigned long num_dirs = 0;
sfnt_seek_set(sfont, 4); /* skip version tag */
version = sfnt_get_ulong(sfont);
num_dirs = sfnt_get_ulong(sfont);
if (ttc_idx < 0 || ttc_idx > (int) (num_dirs - 1)) {
fprintf(stderr, "Invalid TTC index number\n");
uexit(1);
}
sfnt_seek_set(sfont, 12 + ttc_idx * 4);
offset = sfnt_get_ulong(sfont);
return offset;
}
extern int ff_get_ttc_index(char *ffname, char *psname); /* libs/luafontforge/src/luafflib.c */
void make_tt_subset(fd_entry * fd, unsigned char *buffer, integer buflen)
{
long i, cid;
unsigned int last_cid;
glw_entry *found;
struct avl_traverser t;
unsigned char *cidtogidmap;
unsigned short num_glyphs, gid;
struct tt_glyphs *glyphs;
char *used_chars;
sfnt *sfont;
pdf_obj *fontfile;
int verbose = 0, error = 0;
cidtogidmap = NULL;
sfont = sfnt_open(buffer, buflen);
if (sfont->type == SFNT_TYPE_TTC) {
i = ff_get_ttc_index(fd->fm->ff_name, fd->fm->ps_name);
error = sfnt_read_table_directory(sfont, ttc_read_offset(sfont, i));
} else {
error = sfnt_read_table_directory(sfont, 0);
}
if (error < 0) {
fprintf(stderr, "Could not parse the ttf directory.\n");
uexit(1);
}
glyphs = tt_build_init();
last_cid = 0;
avl_t_init(&t, fd->gl_tree);
for (found = (glw_entry *) avl_t_first(&t, fd->gl_tree);
found != NULL; found = (glw_entry *) avl_t_next(&t)) {
if (found->id > last_cid)
last_cid = found->id;
}
#ifndef NO_GHOSTSCRIPT_BUG
cidtogidmap = NULL;
#else
cidtogidmap = xmalloc(((last_cid + 1) * 2) * sizeof(unsigned char));
memset(cidtogidmap, 0, (last_cid + 1) * 2);
#endif
/* fill used_chars */
used_chars = xmalloc((last_cid + 1) * sizeof(char));
memset(used_chars, 0, (last_cid + 1));
avl_t_init(&t, fd->gl_tree);
for (found = (glw_entry *) avl_t_first(&t, fd->gl_tree);
found != NULL; found = (glw_entry *) avl_t_next(&t)) {
used_chars[found->id] = 1;
}
/*
* Map CIDs to GIDs.
*/
num_glyphs = 1; /* .notdef */
for (cid = 1; cid <= (long) last_cid; cid++) {
if (used_chars[cid] == 0)
continue;
gid = cid;
#ifndef NO_GHOSTSCRIPT_BUG
gid = tt_add_glyph(glyphs, gid, cid);
#else
gid = tt_add_glyph(glyphs, gid, num_glyphs);
cidtogidmap[2 * cid] = gid >> 8;
cidtogidmap[2 * cid + 1] = gid & 0xff;
#endif /* !NO_GHOSTSCRIPT_BUG */
num_glyphs++;
}
if (num_glyphs == 1) {
fprintf(stderr, "No glyphs in subset?.\n");
uexit(1);
}
if (tt_build_tables(sfont, glyphs) < 0) {
fprintf(stderr, "Could not parse the ttf buffer.\n");
uexit(1);
}
if (verbose > 1) {
fprintf(stdout, "[%u glyphs (Max CID: %u)]", glyphs->num_glyphs,
last_cid);
}
tt_build_finish(glyphs);
/* Create font file */
for (i = 0; required_table[i].name; i++) {
if (sfnt_require_table(sfont,
required_table[i].name,
required_table[i].must_exist) < 0) {
fprintf(stderr, "Some required TrueType table does not exist.");
uexit(1);
}
}
fontfile = sfnt_create_FontFile_stream(sfont);
if (verbose > 1) {
fprintf(stdout, "[%ld bytes]", fontfile->length);
}
/* squeeze in the cidgidmap */
if (cidtogidmap != NULL) {
cidtogid_obj = pdf_new_objnum();
pdf_begin_dict(cidtogid_obj, 0);
pdf_printf("/Length %i\n", ((last_cid + 1) * 2));
pdf_end_dict();
pdf_printf("stream\n");
pdfroom((last_cid + 1) * 2);
for (i = 0; i < ((int) (last_cid + 1) * 2); i++) {
pdf_buf[pdf_ptr++] = cidtogidmap[i];
}
pdf_printf("\nendstream\n");
}
/* the tff subset */
for (i = 0; i < (int) (fontfile->length); i++)
fb_putchar(fontfile->data[i]);
pdf_release_obj(fontfile);
/* other stuff that needs fixing: */
/*
* DW, W, DW2, and W2
*/
/*
if (opt_flags & CIDFONT_FORCE_FIXEDPITCH) {
pdf_add_dict(font->fontdict,
pdf_new_name("DW"), pdf_new_number(1000.0));
} else {
add_TTCIDHMetrics(font->fontdict, glyphs, used_chars, cidtogidmap, last_cid);
if (v_used_chars)
add_TTCIDVMetrics(font->fontdict, glyphs, used_chars, cidtogidmap, last_cid);
}
*/
/*
* CIDSet
*/
/*
{
pdf_obj *cidset;
cidset = pdf_new_stream(STREAM_COMPRESS);
pdf_add_stream(cidset, used_chars, last_cid/8 + 1);
pdf_add_dict(font->descriptor,
pdf_new_name("CIDSet"),
pdf_ref_obj(cidset));
pdf_release_obj(cidset);
}
*/
xfree(used_chars);
sfnt_close(sfont);
return;
}
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