File: pdfglyph.w

package info (click to toggle)
texlive-bin 2018.20181218.49446-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 186,920 kB
  • sloc: ansic: 873,264; cpp: 311,278; perl: 82,918; sh: 23,243; makefile: 8,590; lex: 4,939; python: 4,462; pascal: 3,813; java: 3,569; yacc: 2,901; tcl: 2,379; exp: 2,031; xml: 844; ruby: 678; lisp: 398; sed: 331; asm: 140; csh: 46; awk: 30
file content (254 lines) | stat: -rw-r--r-- 8,232 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
% pdfglyph.w
%
% Copyright 2009-2011 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

#include "ptexlib.h"
#include "pdf/pdfpage.h"

@ eternal constants

@c
#define e_tj 3 /* must be 3; movements in []TJ are in fontsize/$10^3$ units */

@ @c
static int64_t pdf_char_width(pdfstructure * p, internal_font_number f, int i)
{
    /* use exactly this formula also for calculating the /Width array values */
    return i64round((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;
    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, int ex_glyph)
{
    float slant, extend, expand, scale = 1.0;
    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 = font_units_per_em(f) / 1000.0;
    pdf->f_cur = f;
    p->f_pdf = pdf_set_font(pdf, f);
    p->fs.m = i64round(font_size(f) / u / by_one_bp * ten_pow[p->fs.e]);
    slant = font_slant(f) / 1000.0;
    extend = font_extend(f) / 1000.0;
    expand = 1.0 + (ex_glyph/1) / 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 */
    p->tm[0].m = i64round(scale * expand * extend * ten_pow[p->tm[0].e]);
    p->tm[2].m = i64round(slant * ten_pow[p->tm[2].e]);
    p->tm[3].m = i64round(scale * ten_pow[p->tm[3].e]);
    p->k2 = ten_pow[e_tj + p->cw.e] * scale / (ten_pow[p->pdf.h.e] * pdf2double(p->fs) * pdf2double(p->tm[0]));
    p->cur_ex = ex_glyph ;  /* we keep track of the state of ex */
}


@ @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_out(pdf, ' ');
    print_pdffloat(pdf, p->fs);
    pdf_puts(pdf, " Tf ");
    p->f_pdf_cur = p->f_pdf;
    p->fs_cur.m = p->fs.m;
    p->need_tf = false;
    p->need_tm = true; /* always follow Tf by Tm */
}

@ @c
static void set_textmatrix(PDF pdf, scaledpos pos)
{
    boolean move;
    pdfstructure *p = pdf->pstruct;
    if (!is_textmode(p))
        normal_error("pdf backend","text mode expected in set_textmatrix");
    move = calc_pdfpos(p, pos);
    if (p->need_tm || move) {
        print_pdf_matrix(pdf, p->tm);
        pdf_puts(pdf, " 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;
        p->need_tm = false;
    }
    p->tm0_cur.m = p->tm[0].m;
}

@ Print out a character to PDF buffer; the character will be printed in octal
form in the following cases: chars <= 32, backslash (92), left parenthesis
(40), and right parenthesis (41).

@c
static void pdf_print_char(PDF pdf, int c)
{
    if (c > 255)
        return;
    /* pdf_print_escaped(c) */
    if (c <= 32 || c == '\\' || c == '(' || c == ')' || c > 127) {
        pdf_room(pdf, 4);
        pdf_quick_out(pdf, '\\');
        pdf_quick_out(pdf, (unsigned char) ('0' + ((c >> 6) & 0x3)));
        pdf_quick_out(pdf, (unsigned char) ('0' + ((c >> 3) & 0x7)));
        pdf_quick_out(pdf, (unsigned char) ('0' + (c & 0x7)));
    } else
        pdf_out(pdf, c);
}

static void pdf_print_wide_char(PDF pdf, int c)
{
    char hex[5];
    snprintf(hex, 5, "%04X", c);
    pdf_out_block(pdf, (const char *) hex, 4);
}

@ @c
static void begin_charmode(PDF pdf, internal_font_number f, pdfstructure * p)
{
    if (!is_chararraymode(p))
        normal_error("pdf backend","char array mode expected in begin_char_mode");
    if (font_encodingbytes(f) == 2) {
        p->ishex = 1;
        pdf_out(pdf, '<');
    } else {
        p->ishex = 0;
        pdf_out(pdf, '(');
    }
    p->mode = PMODE_CHAR;
}

@ @c
void end_charmode(PDF pdf)
{
    pdfstructure *p = pdf->pstruct;
    if (!is_charmode(p))
        normal_error("pdf backend","char mode expected in end_char_mode");
    if (p->ishex == 1) {
        p->ishex = 0;
        pdf_out(pdf, '>');
    } else {
        pdf_out(pdf, ')');
    }
    p->mode = PMODE_CHARARRAY;
}

@ @c
static void begin_chararray(PDF pdf)
{
    pdfstructure *p = pdf->pstruct;
    if (!is_textmode(p))
        normal_error("pdf backend","text mode expected in begin_char_array");
    p->pdf_tj_pos = p->pdf;
    p->cw.m = 0;
    pdf_out(pdf, '[');
    p->mode = PMODE_CHARARRAY;
}

@ @c
void end_chararray(PDF pdf)
{
    pdfstructure *p = pdf->pstruct;
    if (!is_chararraymode(p))
        normal_error("pdf backend","char array mode expected in end_char_array");
    pdf_puts(pdf, "]TJ\n");
    p->pdf = p->pdf_tj_pos;
    p->mode = PMODE_TEXT;
}

@ We need to adapt the tm when a font changes. A change can be a change in id
(frontend) or pdf reference (backend, as we share font resources). At such a
change we also need to adapt to the slant and extend. Initially we also need to
take the exfactor of a glyph into account. When the font is unchanged, we still
need to check each glyph for a change in exfactor. We store the current one on
the state record so that we can minimize testing.

@c
void pdf_place_glyph(PDF pdf, internal_font_number f, int c, int ex)
{
    boolean move;
    pdfstructure *p = pdf->pstruct;
    scaledpos pos = pdf->posstruct->pos;
    /* already done:
        if (!char_exists(f, c)) {
            return;
        }
    */
    if (font_writingmode(f) == vertical_writingmode) {
        if (p->wmode != WMODE_V) {
            p->wmode = WMODE_V;
            p->need_tm = true;
        }
    } else {
        if (p->wmode != WMODE_H) {
            p->wmode = WMODE_H;
            p->need_tm = true;
        }
    }
    if (p->need_tf || f != pdf->f_cur || p->f_pdf != p->f_pdf_cur || p->fs.m != p->fs_cur.m || is_pagemode(p)) {
         pdf_goto_textmode(pdf);
         setup_fontparameters(pdf, f, ex);
         set_font(pdf);
    } else if (p->tm0_cur.m != p->tm[0].m || p->cur_ex != ex) {
         setup_fontparameters(pdf, f, ex);
         p->need_tm = true;
    }
    /* all movements */
    move = calc_pdfpos(p, pos); /* within text or chararray or char mode */
    if (move || p->need_tm) {
        if (p->need_tm
        || (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); /* for fine adjustment */
        }
        if (move) {
            if (is_charmode(p))
                end_charmode(pdf);
            print_pdffloat(pdf, p->tj_delta);
            p->cw.m -= p->tj_delta.m * ten_pow[p->cw.e - p->tj_delta.e];
        }
    }
    /* glyph output */
    if (is_chararraymode(p))
        begin_charmode(pdf, f, p);
    else if (!is_charmode(p))
        normal_error("pdf backend","char (array) mode expected in place_glyph");
    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()| */
}