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pkfont.c
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pkfont.c
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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2007-2014 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team.
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
This program 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.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "libtexpdf.h"
#define ENABLE_GLYPHENC 1
#ifndef PKFONT_DPI_DEFAULT
#define PKFONT_DPI_DEFAULT 600u
#endif
static unsigned base_dpi = PKFONT_DPI_DEFAULT;
static pk_open_handler_t pk_open_handler = NULL;
void texpdf_set_pk_open_handler(pk_open_handler_t handler) {
pk_open_handler = handler;
}
void
PKFont_set_dpi (int dpi)
{
if (dpi <= 0)
ERROR("Invalid DPI: %d\n", dpi);
base_dpi = dpi;
}
/* (Only) This requires TFM to get design size... */
#include "tfm.h"
static unsigned
truedpi (const char *ident, double point_size, unsigned bdpi)
{
unsigned dpi = bdpi;
double design_size;
int tfm_id;
tfm_id = texpdf_tfm_open(NULL, ident, 0);
if (tfm_id < 0)
return dpi;
design_size = texpdf_tfm_get_design_size(tfm_id);
if (design_size <= 0.0)
WARN("DESGIN_SIZE <= 0.0? (TFM=\"%s\")", ident);
else {
dpi = (unsigned) ROUND(base_dpi * point_size / design_size, 1.0);
}
return dpi;
}
int
pdf_font_open_pkfont (pdf_font *font)
{
char *ident;
double point_size;
int encoding_id;
unsigned dpi;
FILE *fp;
ident = pdf_font_get_ident(font);
point_size = pdf_font_get_param(font, PDF_FONT_PARAM_POINT_SIZE);
encoding_id = pdf_font_get_encoding(font);
if (!ident || point_size <= 0.0)
return -1;
dpi = truedpi(ident, point_size, base_dpi);
if (!pk_open_handler) {
WARN("PK font used but no handler declared!");
return -1;
}
fp = (pk_open_handler)(ident, dpi);
if (!fp)
return -1;
MFCLOSE(fp);
/* Type 3 fonts doesn't have FontName.
* FontFamily is recommended for PDF 1.5.
*/
pdf_font_set_fontname(font, ident);
if (encoding_id >= 0) {
pdf_encoding_used_by_type3(encoding_id);
WARN("PK font is found for font \"%s\" but non built-in encoding \"%s\" is specified.",
ident, pdf_encoding_get_name(encoding_id));
#if ENABLE_GLYPHENC
WARN(">> Assuming this is for glyph name assignment.");
#else
WARN(">> I can't reencode PK font. (not enough information available)");
WARN(">> Maybe you need to install pfb/opentype/truetype font.");
#endif
}
return 0;
}
/* We are using Mask Image. Fill black is bit clear.
* Optimizing those codes doesn't improve things.
*/
static uint32_t
fill_black_run (unsigned char *dp, uint32_t left, uint32_t run_count)
{
const static unsigned char mask[8] = {
127u, 191u, 223u, 239u, 247u, 251u, 253u, 254u
};
uint32_t right = left + run_count - 1;
for ( ; left <= right; left++) {
dp[left / 8] &= mask[left % 8];
}
return run_count;
}
/* Just skip bits. See decode_packed() */
static uint32_t
fill_white_run (uint32_t run_count)
{
return run_count;
}
static uint32_t
pk_packed_num (uint32_t *np, int dyn_f, unsigned char *dp, uint32_t pl)
{
uint32_t nmbr = 0, i = *np;
int nyb, j;
#define get_nyb() ((i % 2) ? dp[i/2] & 0x0f : (dp[i/2] >> 4) & 0x0f)
if (i / 2 == pl) {
WARN("EOD reached while unpacking pk_packed_num.");
return 0;
}
nyb = get_nyb(); i++;
if (nyb == 0) {
j = 0;
do {
if (i / 2 == pl) {
WARN("EOD reached while unpacking pk_packed_num.");
break;
}
nyb = get_nyb(); i++;
j++;
} while (nyb == 0);
nmbr = nyb;
while (j-- > 0) {
if (i / 2 == pl) {
WARN("EOD reached while unpacking pk_packed_num.");
break;
}
nyb = get_nyb(); i++;
nmbr = nmbr * 16 + nyb;
}
nmbr += (13 - dyn_f) * 16 + dyn_f - 15;
} else if (nyb <= dyn_f) {
nmbr = nyb;
} else if (nyb < 14) {
if (i / 2 == pl) {
WARN("EOD reached while unpacking pk_packed_num.");
return 0;
}
nmbr = (nyb - dyn_f - 1) * 16 + get_nyb() + dyn_f + 1;
i++;
}
*np = i;
return nmbr;
}
static void
send_out (unsigned char *rowptr, uint32_t rowbytes, pdf_obj *stream)
{
texpdf_add_stream(stream, (void *)rowptr, rowbytes);
}
static int
pk_decode_packed (pdf_obj *stream, uint32_t wd, uint32_t ht,
int dyn_f, int run_color, unsigned char *dp, uint32_t pl)
{
unsigned char *rowptr;
uint32_t rowbytes;
uint32_t i, np = 0;
uint32_t run_count = 0, repeat_count = 0;
rowbytes = (wd + 7) / 8;
rowptr = NEW(rowbytes, unsigned char);
/* repeat count is applied to the *current* row.
* "run" can span across rows.
* If there are non-zero repeat count and if run
* spans across row, first repeat and then continue.
*/
for (np = 0, i = 0; i < ht; i++) {
uint32_t rowbits_left, nbits;
repeat_count = 0;
memset(rowptr, 0xff, rowbytes); /* 1 is white */
rowbits_left = wd;
/* Fill run left over from previous row */
if (run_count > 0) {
nbits = MIN(rowbits_left, run_count);
switch (run_color) {
case 0:
rowbits_left -= fill_black_run(rowptr, 0, nbits);
break;
case 1:
rowbits_left -= fill_white_run(nbits);
break;
}
run_count -= nbits;
}
/* Read nybbles until we have a full row */
while (np / 2 < pl && rowbits_left > 0) {
int nyb;
nyb = (np % 2) ? dp[np/2] & 0x0f : (dp[np/2] >> 4) & 0x0f;
if (nyb == 14) { /* packed number "repeat_count" follows */
if (repeat_count != 0)
WARN("Second repeat count for this row!");
np++; /* Consume this nybble */
repeat_count = pk_packed_num(&np, dyn_f, dp, pl);
} else if (nyb == 15) {
if (repeat_count != 0)
WARN("Second repeat count for this row!");
np++; /* Consume this nybble */
repeat_count = 1;
} else { /* run_count */
/* Interprete current nybble as packed number */
run_count = pk_packed_num(&np, dyn_f, dp, pl);
nbits = MIN(rowbits_left, run_count);
run_color = !run_color;
run_count -= nbits;
switch (run_color) {
case 0:
rowbits_left -= fill_black_run(rowptr, wd - rowbits_left, nbits);
break;
case 1:
rowbits_left -= fill_white_run(nbits);
break;
}
}
}
/* We got bitmap row data. */
send_out(rowptr, rowbytes, stream);
for ( ; i < ht && repeat_count > 0; repeat_count--, i++)
send_out(rowptr, rowbytes, stream);
}
RELEASE(rowptr);
return 0;
}
static int
pk_decode_bitmap (pdf_obj *stream, uint32_t wd, uint32_t ht,
int dyn_f, int run_color, unsigned char *dp, uint32_t pl)
{
unsigned char *rowptr, c;
uint32_t i, j, rowbytes;
const static unsigned char mask[8] = {
0x80u, 0x40u, 0x20u, 0x10u, 0x08u, 0x04u, 0x02u, 0x01u
};
ASSERT( dyn_f == 14 );
if (run_color != 0) {
WARN("run_color != 0 for bitmap pk data?");
} else if (pl < (wd * ht + 7) / 8) {
WARN("Insufficient bitmap pk data. %ldbytes expected but only %ldbytes read.",
(wd * ht + 7) / 8, pl);
return -1;
}
rowbytes = (wd + 7) / 8;
rowptr = NEW(rowbytes, unsigned char);
memset(rowptr, 0, rowbytes);
/* Flip. PK bitmap is not byte aligned for each rows. */
for (i = 0, j = 0; i < ht * wd; i++) {
c = dp[i / 8] & mask[i % 8];
if (c == 0)
rowptr[j / 8] |= mask[i % 8]; /* flip bit */
j++;
if (j == wd) {
send_out(rowptr, rowbytes, stream);
memset(rowptr, 0, rowbytes);
j = 0;
}
}
return 0;
}
static void
do_preamble (FILE *fp)
{
/* Check for id byte */
if (fgetc(fp) == 89) {
/* Skip comment */
skip_bytes(get_unsigned_byte(fp), fp);
/* Skip other header info. It's normally used for verifying this
is the file wethink it is */
skip_bytes(16, fp);
} else {
ERROR("embed_pk_font: PK ID byte is incorrect. Are you sure this is a PK file?");
}
return;
}
struct pk_header_
{
uint32_t pkt_len;
int32_t chrcode;
int32_t wd, dx, dy;
uint32_t bm_wd, bm_ht;
int32_t bm_hoff, bm_voff;
int dyn_f, run_color;
};
static int
read_pk_char_header (struct pk_header_ *h, unsigned char opcode, FILE *fp)
{
ASSERT(h);
if ((opcode & 4) == 0) { /* short */
h->pkt_len = (opcode & 3) << 8 | get_unsigned_byte(fp);
h->chrcode = get_unsigned_byte(fp);
h->wd = get_unsigned_triple(fp); /* TFM width */
h->dx = get_unsigned_byte(fp) << 16; /* horizontal escapement */
h->dy = 0;
h->bm_wd = get_unsigned_byte(fp);
h->bm_ht = get_unsigned_byte(fp);
h->bm_hoff = get_signed_byte(fp);
h->bm_voff = get_signed_byte(fp);
h->pkt_len -= 8;
} else if ((opcode & 7) == 7) { /* long */
h->pkt_len = get_positive_quad(fp, "PK", "pkt_len");
h->chrcode = get_signed_quad(fp);
h->wd = get_signed_quad(fp);
h->dx = get_signed_quad(fp); /* 16.16 fixed point number in pixels */
h->dy = get_signed_quad(fp);
h->bm_wd = get_positive_quad(fp, "PK", "bm_wd");
h->bm_ht = get_positive_quad(fp, "PK", "bm_ht");
h->bm_hoff = get_signed_quad(fp);
h->bm_voff = get_signed_quad(fp);
h->pkt_len -= 28;
} else { /* extended short */
h->pkt_len = (opcode & 3) << 16 | get_unsigned_pair(fp);
h->chrcode = get_unsigned_byte(fp);
h->wd = get_unsigned_triple(fp);
h->dx = get_unsigned_pair(fp) << 16;
h->dy = 0;
h->bm_wd = get_unsigned_pair(fp);
h->bm_ht = get_unsigned_pair(fp);
h->bm_hoff = get_signed_pair(fp);
h->bm_voff = get_signed_pair(fp);
h->pkt_len -= 13;
}
h->dyn_f = opcode / 16;
h->run_color = (opcode & 8) ? 1 : 0;
if ((uint32_t)h->chrcode > 0xff)
{
WARN("Unable to handle long characters in PK files: code=0x%04x", h->chrcode);
return -1;
}
return 0;
}
/* CCITT Group 4 filter may reduce file size. */
static pdf_obj *
create_pk_CharProc_stream (struct pk_header_ *pkh,
double chrwid,
unsigned char *pkt_ptr, uint32_t pkt_len)
{
pdf_obj *stream; /* charproc */
int32_t llx, lly, urx, ury;
int len;
llx = -pkh->bm_hoff;
lly = pkh->bm_voff - pkh->bm_ht;
urx = pkh->bm_wd - pkh->bm_hoff;
ury = pkh->bm_voff;
stream = texpdf_new_stream(STREAM_COMPRESS);
/*
* The following line is a "metric" for the PDF reader:
*
* PDF Reference Reference, 4th ed., p.385.
*
* The wx (first operand of d1) must be consistent with the corresponding
* width in the font's Widths array. The format string of sprint() must be
* consistent with write_number() in pdfobj.c.
*/
len = pdf_sprint_number(work_buffer, chrwid);
len += sprintf (work_buffer + len, " 0 %d %d %d %d d1\n", llx, lly, urx, ury);
texpdf_add_stream(stream, work_buffer, len);
/*
* Acrobat dislike transformation [0 0 0 0 dx dy].
* PDF Reference, 4th ed., p.147, says,
*
* Use of a noninvertible matrix when painting graphics objects can result in
* unpredictable behavior.
*
* but it does not forbid use of such transformation.
*/
if (pkh->bm_wd != 0 && pkh->bm_ht != 0 && pkt_len > 0) {
/* Scale and translate origin to lower left corner for raster data */
len = sprintf (work_buffer, "q\n%u 0 0 %u %d %d cm\n", pkh->bm_wd, pkh->bm_ht, llx, lly);
texpdf_add_stream(stream, work_buffer, len);
len = sprintf (work_buffer, "BI\n/W %u\n/H %u\n/IM true\n/BPC 1\nID ", pkh->bm_wd, pkh->bm_ht);
texpdf_add_stream(stream, work_buffer, len);
/* Add bitmap data */
if (pkh->dyn_f == 14) /* bitmap */
pk_decode_bitmap(stream,
pkh->bm_wd, pkh->bm_ht,
pkh->dyn_f, pkh->run_color,
pkt_ptr, pkt_len);
else
pk_decode_packed(stream,
pkh->bm_wd, pkh->bm_ht,
pkh->dyn_f, pkh->run_color,
pkt_ptr, pkt_len);
len = sprintf (work_buffer, "\nEI\nQ");
texpdf_add_stream(stream, work_buffer, len);
} /* Otherwise we embed an empty stream :-( */
return stream;
}
#define PK_XXX1 240
#define PK_XXX2 241
#define PK_XXX3 242
#define PK_XXX4 243
#define PK_YYY 244
#define PK_POST 245
#define PK_NO_OP 246
#define PK_PRE 247
#define pk_char2name(b,c) sprintf((b), "x%02X", (unsigned char)(c))
int
pdf_font_load_pkfont (pdf_font *font)
{
pdf_obj *fontdict;
char *usedchars;
char *ident;
unsigned dpi;
FILE *fp;
double point_size, pix2charu;
int opcode, code, firstchar, lastchar, prev;
pdf_obj *charprocs, *procset, *encoding, *tmp_array;
double widths[256];
pdf_rect bbox;
char charavail[256];
#if ENABLE_GLYPHENC
int encoding_id;
char **enc_vec;
#endif /* ENABLE_GLYPHENC */
int error = 0;
if (!pdf_font_is_in_use(font)) {
return 0;
}
ident = pdf_font_get_ident(font);
point_size = pdf_font_get_param(font, PDF_FONT_PARAM_POINT_SIZE);
usedchars = pdf_font_get_usedchars(font);
#if ENABLE_GLYPHENC
encoding_id = pdf_font_get_encoding(font);
if (encoding_id < 0)
enc_vec = NULL;
else {
enc_vec = pdf_encoding_get_encoding(encoding_id);
}
#endif /* ENABLE_GLYPHENC */
ASSERT(ident && usedchars && point_size > 0.0);
dpi = truedpi(ident, point_size, base_dpi);
if (!pk_open_handler) {
ERROR("PK font used but no handler declared!");
return -1;
}
fp = (pk_open_handler)(ident, dpi);
if (!fp) {
ERROR("Could not find/open PK font file: %s (at %udpi)", ident, dpi);
}
memset(charavail, 0, 256);
charprocs = texpdf_new_dict();
/* Include bitmap as 72dpi image:
* There seems to be problems in "scaled" bitmap glyph
* rendering in several viewers.
*/
pix2charu = 72. * 1000. / ((double) base_dpi) / point_size;
bbox.llx = bbox.lly = HUGE_VAL;
bbox.urx = bbox.ury = -HUGE_VAL;
while ((opcode = fgetc(fp)) >= 0 && opcode != PK_POST) {
if (opcode < 240) {
struct pk_header_ pkh;
error = read_pk_char_header(&pkh, opcode, fp);
if (error)
ERROR("Error in reading PK character header.");
else if (charavail[pkh.chrcode & 0xff])
WARN("More than two bitmap image for single glyph?: font=\"%s\" code=0x%02x",
ident, pkh.chrcode);
if (!usedchars[pkh.chrcode & 0xff])
skip_bytes(pkh.pkt_len, fp);
else {
char *charname;
pdf_obj *charproc;
unsigned char *pkt_ptr;
size_t bytesread;
double charwidth;
/* Charwidth in PDF units */
charwidth = ROUND(1000.0 * pkh.wd / (((double) (1<<20))*pix2charu), 0.1);
widths[pkh.chrcode & 0xff] = charwidth;
/* Update font BBox info */
bbox.llx = MIN(bbox.llx, -pkh.bm_hoff);
bbox.lly = MIN(bbox.lly, (double)pkh.bm_voff - (double)pkh.bm_ht);
bbox.urx = MAX(bbox.urx, (double)pkh.bm_wd - (double)pkh.bm_hoff);
bbox.ury = MAX(bbox.ury, pkh.bm_voff);
pkt_ptr = NEW(pkh.pkt_len, unsigned char);
if ((bytesread = fread(pkt_ptr, 1, pkh.pkt_len, fp))!= pkh.pkt_len) {
ERROR("Only %ld bytes PK packet read. (expected %ld bytes)",
bytesread, pkh.pkt_len);
}
charproc = create_pk_CharProc_stream(&pkh, charwidth, pkt_ptr, bytesread);
RELEASE(pkt_ptr);
if (!charproc)
ERROR("Unpacking PK character data failed.");
#if ENABLE_GLYPHENC
if (encoding_id >= 0 && enc_vec) {
charname = (char *) enc_vec[pkh.chrcode & 0xff];
if (!charname) {
WARN("\".notdef\" glyph used in font (code=0x%02x): %s", pkh.chrcode, ident);
charname = work_buffer;
pk_char2name(charname, pkh.chrcode);
}
}
else
#endif /* ENABLE_GLYPHENC */
{
charname = work_buffer;
pk_char2name(charname, pkh.chrcode);
}
texpdf_add_dict(charprocs, texpdf_new_name(charname), texpdf_ref_obj(charproc)); /* _FIXME_ */
texpdf_release_obj(charproc);
}
charavail[pkh.chrcode & 0xff] = 1;
} else { /* A command byte */
switch (opcode) {
case PK_NO_OP: break;
case PK_XXX1: case PK_XXX2: case PK_XXX3: case PK_XXX4:
{
int32_t len = get_unsigned_num(fp, opcode-PK_XXX1);
if (len < 0)
WARN("PK: Special with %d bytes???", len);
else
skip_bytes(len, fp);
break;
}
case PK_YYY: skip_bytes(4, fp); break;
case PK_PRE: do_preamble(fp); break;
}
}
}
MFCLOSE(fp);
/* Check if we really got all glyphs needed. */
for (code = 0; code < 256; code++) {
if (usedchars[code] && !charavail[code])
WARN("Missing glyph code=0x%02x in PK font \"%s\".", code, ident);
}
/* Now actually fill fontdict. */
fontdict = pdf_font_get_resource(font);
texpdf_add_dict(fontdict,
texpdf_new_name("CharProcs"), texpdf_ref_obj(charprocs));
texpdf_release_obj(charprocs);
/*
* Resources:
*
* PDF Reference 4th ed. describes it as "Optional but strongly recommended".
* There are no reason to put it in our case, but we will put this.
* We do not care about compatibility with Acrobat 2.x. (See implementation
* note 47, Appendix H of PDF Ref., 4th ed.).
*/
procset = texpdf_new_dict();
tmp_array = texpdf_new_array();
texpdf_add_array(tmp_array, texpdf_new_name("PDF"));
texpdf_add_array(tmp_array, texpdf_new_name("ImageB"));
texpdf_add_dict(procset,
texpdf_new_name("ProcSet"), tmp_array);
texpdf_add_dict(fontdict,
texpdf_new_name("Resources"), procset);
/* Encoding */
tmp_array = texpdf_new_array();
prev = -2; firstchar = 255; lastchar = 0;
for (code = 0; code < 256; code++) {
char *charname;
if (usedchars[code]) {
if (code < firstchar) firstchar = code;
if (code > lastchar) lastchar = code;
if (code != prev + 1)
texpdf_add_array(tmp_array, texpdf_new_number(code));
#if ENABLE_GLYPHENC
if (encoding_id >= 0 && enc_vec) {
charname = (char *) enc_vec[(unsigned char) code];
if (!charname) {
charname = work_buffer;
pk_char2name(charname, code);
}
}
else
#endif /* ENABLE_GLYPHENC */
{
charname = work_buffer;
pk_char2name(charname, code);
}
texpdf_add_array(tmp_array, texpdf_new_name(charname));
prev = code;
}
}
if (firstchar > lastchar) {
ERROR("Unexpected error: firstchar > lastchar (%d %d)",
firstchar, lastchar);
texpdf_release_obj(tmp_array);
return -1;
}
#if ENABLE_GLYPHENC
if (encoding_id < 0 || !enc_vec) {
#else
if (1) {
#endif /* ENABLE_GLYPHENC */
encoding = texpdf_new_dict();
texpdf_add_dict(encoding,
texpdf_new_name("Type"), texpdf_new_name("Encoding"));
texpdf_add_dict(encoding,
texpdf_new_name("Differences"), tmp_array);
texpdf_add_dict(fontdict,
texpdf_new_name("Encoding"), texpdf_ref_obj(encoding));
texpdf_release_obj(encoding);
} else
texpdf_release_obj(tmp_array);
/* FontBBox: Accurate value is important.
*/
tmp_array = texpdf_new_array();
texpdf_add_array(tmp_array, texpdf_new_number(bbox.llx));
texpdf_add_array(tmp_array, texpdf_new_number(bbox.lly));
texpdf_add_array(tmp_array, texpdf_new_number(bbox.urx));
texpdf_add_array(tmp_array, texpdf_new_number(bbox.ury));
texpdf_add_dict (fontdict , texpdf_new_name("FontBBox"), tmp_array);
/* Widths:
* Indirect reference preffered. (See PDF Reference)
*/
tmp_array = texpdf_new_array();
for (code = firstchar; code <= lastchar; code++) {
if (usedchars[code])
texpdf_add_array(tmp_array, texpdf_new_number(widths[code]));
else {
texpdf_add_array(tmp_array, texpdf_new_number(0));
}
}
texpdf_add_dict(fontdict,
texpdf_new_name("Widths"), texpdf_ref_obj(tmp_array));
texpdf_release_obj(tmp_array);
/* FontMatrix */
tmp_array = texpdf_new_array();
texpdf_add_array(tmp_array, texpdf_new_number(0.001 * pix2charu));
texpdf_add_array(tmp_array, texpdf_new_number(0.0));
texpdf_add_array(tmp_array, texpdf_new_number(0.0));
texpdf_add_array(tmp_array, texpdf_new_number(0.001 * pix2charu));
texpdf_add_array(tmp_array, texpdf_new_number(0.0));
texpdf_add_array(tmp_array, texpdf_new_number(0.0));
texpdf_add_dict (fontdict , texpdf_new_name("FontMatrix"), tmp_array);
texpdf_add_dict(fontdict,
texpdf_new_name("FirstChar"), texpdf_new_number(firstchar));
texpdf_add_dict(fontdict,
texpdf_new_name("LastChar"), texpdf_new_number(lastchar));
return 0;
}