summaryrefslogtreecommitdiff
path: root/Build/source/texk/xdvipdfmx/src/spc_color.c
blob: 35880193012a1485c546168f41456737a7baaf89 (plain)
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
/*  $Header: /home/cvsroot/dvipdfmx/src/spc_color.c,v 1.6 2007/11/22 11:45:39 chofchof Exp $
    
    This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.

    Copyright (C) 2002 by Jin-Hwan Cho and Shunsaku Hirata,
    the dvipdfmx project team <dvipdfmx@project.ktug.or.kr>
    
    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.
*/

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include "system.h"
#include "mem.h"
#include "error.h"
#include "dpxutil.h"

#include "pdfdev.h"
#include "pdfcolor.h"

#include "specials.h"

#include "spc_util.h"
#include "spc_color.h"


/* Color stack is actually placed into pdfcolor.c.
 * The reason why we need to place stack there is
 * that we must reinstall color after grestore and
 * other operations that can change current color
 * implicitely.
 */

int
spc_color_at_begin_page (void)
{
  return  0;
}

int
spc_color_at_end_page (void)
{
  return  0;
}

int
spc_color_at_begin_document (void)
{
  return  0;
}

int
spc_color_at_end_document (void)
{
  return  0;
}

static int
spc_handler_color_push (struct spc_env *spe, struct spc_arg *args)
{
  int        error;
  pdf_color  colorspec;

  error = spc_util_read_colorspec(spe, &colorspec, args, 1);
  if (!error) {
    pdf_color_push(&colorspec, &colorspec);
  }

  return  error;
}

static int
spc_handler_color_pop  (struct spc_env *spe, struct spc_arg *args)
{
  pdf_color_pop();

  return  0;
}

/* Invoked by the special command "color rgb .625 0 0".
 * DVIPS clears the color stack, and then saves and sets the given color.
 */
static int
spc_handler_color_default (struct spc_env *spe, struct spc_arg *args)
{
  int        error;
  pdf_color  colorspec;

  error = spc_util_read_colorspec(spe, &colorspec, args, 1);
  if (!error) {
    pdf_color_set_default(&colorspec);
    pdf_color_clear_stack(); /* the default color is saved on color_stack */
    pdf_color_push(&colorspec, &colorspec);
  }

  return  error;
}


/* This is from color special? */
#include "pdfdoc.h"

static int
spc_handler_background (struct spc_env *spe, struct spc_arg *args)
{
  int        error;
  pdf_color  colorspec;

  error = spc_util_read_colorspec(spe, &colorspec, args, 1);
  if (!error)
    pdf_doc_set_bgcolor(&colorspec);

  return  error;
}


#ifndef ISBLANK
#define ISBLANK(c) ((c) == ' ' || (c) == '\t' || (c) == '\v')
#endif
static void 
skip_blank (char **pp, char *endptr)
{
  char  *p = *pp;
  for ( ; p < endptr && ISBLANK(*p); p++);
  *pp = p;
}

int
spc_color_check_special (const char *buf, long len)
{
  int   r = 0;
  char *q, *p, *endptr;

  p      = (char *) buf;
  endptr = p + len;

  skip_blank(&p, endptr);
  q = parse_c_ident(&p, endptr);
  if (!q)
    return  0;
  else if (!strcmp(q, "color"))
    r = 1;
  else if (!strcmp(q, "background")) {
    r = 1;
  }
  RELEASE(q);

  return  r;
}

extern int
spc_color_setup_handler (struct spc_handler *sph,
			 struct spc_env *spe, struct spc_arg *ap)
{
  char  *p, *q;

  ASSERT(sph && spe && ap);

  skip_blank(&ap->curptr, ap->endptr);
  q = parse_c_ident(&ap->curptr, ap->endptr);
  if (!q)
    return  -1;
  skip_blank(&ap->curptr, ap->endptr);

  if (!strcmp(q, "background")) {
    ap->command = (char *) "background";
    sph->exec   = &spc_handler_background;
    RELEASE(q);
  } else if (!strcmp(q, "color")) { /* color */
    RELEASE(q);
    p = ap->curptr;

    q = parse_c_ident(&p, ap->endptr);
    if (!q)
      return  -1;
    else if (!strcmp(q, "push")) {
      ap->command = (char *) "push";
      sph->exec   = &spc_handler_color_push;
      ap->curptr  = p;
    } else if (!strcmp(q, "pop")) {
      ap->command = (char *) "pop";
      sph->exec   = &spc_handler_color_pop;
      ap->curptr  = p;
    } else { /* cmyk, rgb, ... */
      ap->command = (char *) "";
      sph->exec   = &spc_handler_color_default;
    }
    RELEASE(q);
  } else {
    spc_warn(spe, "Not color/background special?");
    RELEASE(q);
    return  -1;
  }

  skip_blank(&ap->curptr, ap->endptr);
  return  0;
}