tpictures.c - plan9port - [fork] Plan 9 from user space
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tpictures.c (9628B)
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1 /*
2 *
3 * PostScript picture inclusion routines. Support for managing in-line pictures
4 * has been added, and works in combination with the simple picpack pre-processor
5 * that's supplied with this package. An in-line picture begins with a special
6 * device control command that looks like,
7 *
8 * x X InlinPicture name size
9 *
10 * where name is the pathname of the original picture file and size is the number
11 * of bytes in the picture, which begins immediately on the next line. When dpost
12 * encounters the InlinePicture device control command inlinepic() is called and
13 * that routine appends the string name and the integer size to a temporary file
14 * (fp_pic) and then adds the next size bytes read from the current input file to
15 * file fp_pic. All in-line pictures are saved in fp_pic and located later using
16 * the name string and picture file size that separate pictures saved in fp_pic.
17 *
18 * When a picture request (ie. an "x X PI" command) is encountered picopen() is
19 * called and it first looks for the picture file in fp_pic. If it's found there
20 * the entire picture (ie. size bytes) is copied from fp_pic to a new temp file
21 * and that temp file is used as the picture file. If there's nothing in fp_pic
22 * or if the lookup failed the original route is taken.
23 *
24 * Support for in-line pictures is an attempt to address requirements, expressed
25 * by several organizations, of being able to store a document as a single file
26 * (usually troff input) that can then be sent through dpost and ultimately to
27 * a PostScript printer. The mechanism may help some users, but the are obvious
28 * disadvantages to this approach, and the original mechanism is the recommended
29 * approach! Perhaps the most important problem is that troff output, with in-line
30 * pictures included, doesn't fit the device independent language accepted by
31 * important post-processors (like proff) and that means you won't be able to
32 * reliably preview a packed file on your 5620 (or whatever).
33 *
34 */
35
36 #include <u.h>
37 #include <libc.h>
38 #include <bio.h>
39 #include <stdio.h>
40 #include "ext.h"
41 #include "common.h"
42 #include "tr2post.h"
43 /* PostScript file structuring comments */
44 #include "comments.h"
45 /* general purpose definitions */
46 /* #include "gen.h" */
47 /* just for TEMPDIR definition */
48 #include "path.h"
49 /* external variable declarations */
50 /* #include "ext.h" */
51
52 Biobuf *bfp_pic = NULL;
53 Biobuf *Bfp_pic;
54 Biobuf *picopen(char *);
55
56 #define MAXGETFIELDS 16
57 char *fields[MAXGETFIELDS];
58 int nfields;
59
60 extern int devres, hpos, vpos;
61 extern int picflag;
62
63 /*****************************************************************************/
64
65 void
66 picture(Biobuf *inp, char *buf) {
67 int poffset; /* page offset */
68 int indent; /* indent */
69 int length; /* line length */
70 int totrap; /* distance to next trap */
71 char name[100]; /* picture file and page string */
72 char hwo[40], *p; /* height, width and offset strings */
73 char flags[20]; /* miscellaneous stuff */
74 int page = 1; /* page number pulled from name[] */
75 double frame[4]; /* height, width, y, and x offsets from hwo[] */
76 char units; /* scale indicator for frame dimensions */
77 int whiteout = 0; /* white out the box? */
78 int outline = 0; /* draw a box around the picture? */
79 int scaleboth = 0; /* scale both dimensions? */
80 double adjx = 0.5; /* left-right adjustment */
81 double adjy = 0.5; /* top-bottom adjustment */
82 double rot = 0; /* rotation in clockwise degrees */
83 Biobuf *fp_in; /* for *name */
84 int i; /* loop index */
85
86 /*
87 *
88 * Called from devcntrl() after an 'x X PI' command is found. The syntax of that
89 * command is:
90 *
91 * x X PI:args
92 *
93 * with args separated by colons and given by:
94 *
95 * poffset
96 * indent
97 * length
98 * totrap
99 * file[(page)]
100 * height[,width[,yoffset[,xoffset]]]
101 * [flags]
102 *
103 * poffset, indent, length, and totrap are given in machine units. height, width,
104 * and offset refer to the picture frame in inches, unless they're followed by
105 * the u scale indicator. flags is a string that provides a little bit of control
106 * over the placement of the picture in the frame. Rotation of the picture, in
107 * clockwise degrees, is set by the a flag. If it's not followed by an angle
108 * the current rotation angle is incremented by 90 degrees, otherwise the angle
109 * is set by the number that immediately follows the a.
110 *
111 */
112
113 if (!picflag) /* skip it */
114 return;
115 endstring();
116
117 flags[0] = '\0'; /* just to be safe */
118
119 nfields = getfields(buf, fields, MAXGETFIELDS, 0, ":\n");
120 if (nfields < 6) {
121 error(WARNING, "too few arguments to specify picture");
122 return;
123 }
124 poffset = atoi(fields[1]);
125 indent = atoi(fields[2]);
126 length = atoi(fields[3]);
127 totrap = atoi(fields[4]);
128 strncpy(name, fields[5], sizeof(name));
129 strncpy(hwo, fields[6], sizeof(hwo));
130 if (nfields >= 6)
131 strncpy(flags, fields[7], sizeof(flags));
132
133 nfields = getfields(buf, fields, MAXGETFIELDS, 0, "()");
134 if (nfields == 2) {
135 strncpy(name, fields[0], sizeof(name));
136 page = atoi(fields[1]);
137 }
138
139 if ((fp_in = picopen(name)) == NULL) {
140 error(WARNING, "can't open picture file %s\n", name);
141 return;
142 }
143
144 frame[0] = frame[1] = -1; /* default frame height, width */
145 frame[2] = frame[3] = 0; /* and y and x offsets */
146
147 for (i = 0, p = hwo-1; i < 4 && p != NULL; i++, p = strchr(p, ','))
148 if (sscanf(++p, "%lf%c", &frame[i], &units) == 2)
149 if (units == 'i' || units == ',' || units == '\0')
150 frame[i] *= devres;
151
152 if (frame[0] <= 0) /* check what we got for height */
153 frame[0] = totrap;
154
155 if (frame[1] <= 0) /* and width - check too big?? */
156 frame[1] = length - indent;
157
158 frame[3] += poffset + indent; /* real x offset */
159
160 for (i = 0; flags[i]; i++)
161 switch (flags[i]) {
162 case 'c': adjx = adjy = 0.5; break; /* move to the center */
163 case 'l': adjx = 0; break; /* left */
164 case 'r': adjx = 1; break; /* right */
165 case 't': adjy = 1; break; /* top */
166 case 'b': adjy = 0; break; /* or bottom justify */
167 case 'o': outline = 1; break; /* outline the picture */
168 case 'w': whiteout = 1; break; /* white out the box */
169 case 's': scaleboth = 1; break; /* scale both dimensions */
170 case 'a': if ( sscanf(&flags[i+1], "%lf", &rot) != 1 )
171 rot += 90;
172 }
173
174 /* restore(); */
175 endstring();
176 Bprint(Bstdout, "cleartomark\n");
177 Bprint(Bstdout, "saveobj restore\n");
178
179 ps_include(fp_in, Bstdout, page, whiteout, outline, scaleboth,
180 frame[3]+frame[1]/2, -vpos-frame[2]-frame[0]/2, frame[1], frame[0], adjx, adjy, -rot);
181 /* save(); */
182 Bprint(Bstdout, "/saveobj save def\n");
183 Bprint(Bstdout, "mark\n");
184 Bterm(fp_in);
185
186 }
187
188 /*
189 *
190 * Responsible for finding and opening the next picture file. If we've accumulated
191 * any in-line pictures fp_pic won't be NULL and we'll look there first. If *path
192 * is found in *fp_pic we create another temp file, open it for update, unlink it,
193 * copy in the picture, seek back to the start of the new temp file, and return
194 * the file pointer to the caller. If fp_pic is NULL or the lookup fails we just
195 * open file *path and return the resulting file pointer to the caller.
196 *
197 */
198 Biobuf *
199 picopen(char *path) {
200 /* char name[100]; /* pathnames */
201 /* long pos; /* current position */
202 /* long total; /* and sizes - from *fp_pic */
203 Biobuf *bfp;
204 Biobuf *Bfp; /* and pointer for the new temp file */
205
206
207 if ((bfp = Bopen(path, OREAD)) == 0)
208 error(FATAL, "can't open %s\n", path);
209 Bfp = bfp; /* &(bfp->Biobufhdr); */
210 return(Bfp);
211 #ifdef UNDEF
212 if (Bfp_pic != NULL) {
213 Bseek(Bfp_pic, 0L, 0);
214 while (Bgetfield(Bfp_pic, 's', name, 99)>0
215 && Bgetfield(Bfp_pic, 'd', &total, 0)>0) {
216 pos = Bseek(Bfp_pic, 0L, 1);
217 if (strcmp(path, name) == 0) {
218 if (tmpnam(pictmpname) == NULL)
219 error(FATAL, "can't generate temp file name");
220 if ( (bfp = Bopen(pictmpname, ORDWR)) == NULL )
221 error(FATAL, "can't open %s", pictmpname);
222 Bfp = &(bfp->Biobufhdr);
223 piccopy(Bfp_pic, Bfp, total);
224 Bseek(Bfp, 0L, 0);
225 return(Bfp);
226 }
227 Bseek(Bfp_pic, total+pos, 0);
228 }
229 }
230 if ((bfp = Bopen(path, OREAD)) == 0)
231 Bfp = 0;
232 else
233 Bfp = &(bfp->Biobufhdr);
234 return(Bfp);
235 #endif
236 }
237
238 /*
239 *
240 * Adds an in-line picture file to the end of temporary file *Bfp_pic. All pictures
241 * grabbed from the input file are saved in the same temp file. Each is preceeded
242 * by a one line header that includes the original picture file pathname and the
243 * size of the picture in bytes. The in-line picture file is opened for update,
244 * left open, and unlinked so it disappears when we do.
245 *
246 */
247 /* *fp; /* current input file */
248 /* *buf; /* whatever followed "x X InlinePicture" */
249
250 #ifdef UNDEF
251 void
252 inlinepic(Biobufhdr *Bfp, char *buf) {
253 char name[100]; /* picture file pathname */
254 long total; /* and size - both from *buf */
255
256
257 if (Bfp_pic == NULL ) {
258 tmpnam(pictmpname);
259 if ((bfp_pic = Bopen(pictmpname, ORDWR)) == 0)
260 error(FATAL, "can't open in-line picture file %s", ipictmpname);
261 unlink(pictmpname);
262 }
263
264 if ( sscanf(buf, "%s %ld", name, &total) != 2 )
265 error(FATAL, "in-line picture error");
266
267 fseek(Bfp_pic, 0L, 2);
268 fprintf(Bfp_pic, "%s %ld\n", name, total);
269 getc(fp);
270 fflush(fp_pic);
271 piccopy(fp, fp_pic, total);
272 ungetc('\n', fp);
273
274 }
275 #endif
276
277 /*
278 *
279 * Copies total bytes from file fp_in to fp_out. Used to append picture files to
280 * *fp_pic and then copy them to yet another temporary file immediately before
281 * they're used (in picture()).
282 *
283 */
284 /* *fp_in; input */
285 /* *fp_out; and output file pointers */
286 /* total; number of bytes to be copied */
287 void
288 piccopy(Biobuf *Bfp_in, Biobuf *Bfp_out, long total) {
289 long i;
290
291 for (i = 0; i < total; i++)
292 if (Bputc(Bfp_out, Bgetc(Bfp_in)) < 0)
293 error(FATAL, "error copying in-line picture file");
294 Bflush(Bfp_out);
295 }