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% pdfglyph.w
% Copyright 2009-2010 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/>.
@ @c
static const char _svn_version[] =
"$Id: pdfglyph.w 3584 2010-04-02 17:45:55Z hhenkel $"
"$URL: http://foundry.supelec.fr/svn/luatex/branches/0.60.x/source/texk/web2c/luatexdir/pdf/pdfglyph.w $";
#include "ptexlib.h"
@ @c
#include "pdf/pdfpage.h"
#define lround(a) (long) floor((a) + 0.5)
#define pdf2double(a) ((double) (a).m / ten_pow[(a).e])
@ eternal constants
@c
#define one_bp ((double) 65536 * (double) 72.27 / 72) /* number of sp per 1bp */
#define e_tj 3 /* must be 3; movements in []TJ are in fontsize/$10^3$ units */
@ @c
static long pdf_char_width(pdfstructure * p, internal_font_number f, int i)
{
/* use exactly this formula also for calculating the /Width array values */
return
lround((double) char_width(f, i) / font_size(f) *
ten_pow[e_tj + p->cw.e]);
}
@ @c
void pdf_print_charwidth(PDF pdf, internal_font_number f, int i)
{
pdffloat cw;
pdfstructure *p = pdf->pstruct;
assert(pdf_font_blink(f) == null_font); /* must use unexpanded font! */
cw.m = pdf_char_width(p, f, i);
cw.e = p->cw.e;
print_pdffloat(pdf, cw);
}
@ @c
static void setup_fontparameters(PDF pdf, internal_font_number f)
{
float slant, extend, expand;
float u = 1.0;
pdfstructure *p = pdf->pstruct;
/* fix mantis bug \# 0000200 (acroread "feature") */
if ((font_format(f) == opentype_format ||
(font_format(f) == type1_format && font_encodingbytes(f) == 2))
&& font_units_per_em(f) > 0)
u = (float) (font_units_per_em(f) / 1000.0);
pdf->f_cur = f;
p->f_pdf = pdf_set_font(pdf, f);
p->fs.m = lround((float) font_size(f) / u / one_bp * ten_pow[p->fs.e]);
slant = (float) font_slant(f) / (float) 1000.0;
extend = (float) font_extend(f) / (float) 1000.0;
expand = (float) 1.0 + (float) font_expand_ratio(f) / (float) 1000.0;
p->tj_delta.e = p->cw.e - 1; /* "- 1" makes less corrections inside []TJ */
/* no need to be more precise than TeX (1sp) */
while (p->tj_delta.e > 0
&& (double) font_size(f) / ten_pow[p->tj_delta.e + e_tj] < 0.5)
p->tj_delta.e--; /* happens for very tiny fonts */
assert(p->cw.e >= p->tj_delta.e); /* else we would need, e. g., |ten_pow[-1]| */
p->tm[0].m = lround(expand * extend * (float) ten_pow[p->tm[0].e]);
p->tm[2].m = lround(slant * (float) ten_pow[p->tm[2].e]);
p->k2 =
ten_pow[e_tj +
p->cw.e] / (ten_pow[p->pdf.h.e] * pdf2double(p->fs) *
pdf2double(p->tm[0]));
}
@ @c
static void set_font(PDF pdf)
{
pdfstructure *p = pdf->pstruct;
pdf_printf(pdf, "/F%d", (int) p->f_pdf);
pdf_print_resname_prefix(pdf);
pdf_printf(pdf, " ");
print_pdffloat(pdf, p->fs);
pdf_printf(pdf, " Tf ");
p->f_pdf_cur = p->f_pdf;
p->fs_cur.m = p->fs.m;
}
@ @c
static void print_tm(PDF pdf, pdffloat * tm)
{
print_pdf_matrix(pdf, tm);
pdf_printf(pdf, " Tm ");
}
@ @c
static void set_textmatrix(PDF pdf, scaledpos pos)
{
boolean move;
pdfstructure *p = pdf->pstruct;
assert(is_textmode(p));
move = calc_pdfpos(p, pos);
if (move == TRUE) {
print_tm(pdf, p->tm);
p->pdf.h.m = p->pdf_bt_pos.h.m + p->tm[4].m; /* Tm replaces */
p->pdf.v.m = p->pdf_bt_pos.v.m + p->tm[5].m;
}
}
@ @c
static void begin_charmode(PDF pdf, internal_font_number f, pdfstructure * p)
{
assert(is_chararraymode(p));
if (font_encodingbytes(f) == 2) {
p->ishex = 1;
pdf_printf(pdf, "<");
} else {
p->ishex = 0;
pdf_printf(pdf, "(");
}
p->mode = PMODE_CHAR;
}
@ @c
void end_charmode(PDF pdf)
{
pdfstructure *p = pdf->pstruct;
assert(is_charmode(p));
if (p->ishex == 1) {
p->ishex = 0;
pdf_printf(pdf, ">");
} else {
pdf_printf(pdf, ")");
}
p->mode = PMODE_CHARARRAY;
}
@ @c
static void begin_chararray(PDF pdf)
{
pdfstructure *p = pdf->pstruct;
assert(is_textmode(p));
p->pdf_tj_pos = p->pdf;
p->cw.m = 0;
pdf_printf(pdf, "[");
p->mode = PMODE_CHARARRAY;
}
@ @c
void end_chararray(PDF pdf)
{
pdfstructure *p = pdf->pstruct;
assert(is_chararraymode(p));
pdf_printf(pdf, "]TJ\n");
p->pdf = p->pdf_tj_pos;
p->mode = PMODE_TEXT;
}
@ @c
void pdf_place_glyph(PDF pdf, internal_font_number f, int c)
{
boolean move;
pdfstructure *p = pdf->pstruct;
scaledpos pos = pdf->posstruct->pos;
if (!char_exists(f, c))
return;
if (f != pdf->f_cur || is_textmode(p) || is_pagemode(p)) {
pdf_goto_textmode(pdf);
if (f != pdf->f_cur)
setup_fontparameters(pdf, f);
if (p->f_pdf != p->f_pdf_cur || p->fs.m != p->fs_cur.m)
set_font(pdf);
set_textmatrix(pdf, pos);
begin_chararray(pdf);
}
assert(is_charmode(p) || is_chararraymode(p));
move = calc_pdfpos(p, pos);
if (move == TRUE) {
if ((p->wmode == WMODE_H
&& (p->pdf_bt_pos.v.m + p->tm[5].m) != p->pdf.v.m)
|| (p->wmode == WMODE_V
&& (p->pdf_bt_pos.h.m + p->tm[4].m) != p->pdf.h.m)
|| abs(p->tj_delta.m) >= 1000000) {
pdf_goto_textmode(pdf);
set_textmatrix(pdf, pos);
begin_chararray(pdf);
move = calc_pdfpos(p, pos);
}
if (move == TRUE) {
assert((p->wmode == WMODE_H
&& (p->pdf_bt_pos.v.m + p->tm[5].m) == p->pdf.v.m)
|| (p->wmode == WMODE_V
&& (p->pdf_bt_pos.h.m + p->tm[4].m) == p->pdf.h.m));
if (is_charmode(p))
end_charmode(pdf);
assert(p->tj_delta.m != 0);
print_pdffloat(pdf, p->tj_delta);
p->cw.m -= p->tj_delta.m * ten_pow[p->cw.e - p->tj_delta.e];
}
}
if (is_chararraymode(p))
begin_charmode(pdf, f, p);
pdf_mark_char(f, c);
if (font_encodingbytes(f) == 2)
pdf_print_wide_char(pdf, char_index(f, c));
else
pdf_print_char(pdf, c);
p->cw.m += pdf_char_width(p, p->f_pdf, c); /* aka |adv_char_width()| */
}
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