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authorrsc <devnull@localhost>2004-05-15 23:55:53 +0000
committerrsc <devnull@localhost>2004-05-15 23:55:53 +0000
commit61f5c35c9465f0702739b41249a664d409f0482c (patch)
tree17546b7dcc76abd9ee74dc7543cc77121acfe39a /src/cmd/postscript/tr2post/pictures.c
parent173302913ebce353eadcbb12d71c3759cbe79e34 (diff)
downloadplan9port-61f5c35c9465f0702739b41249a664d409f0482c.tar.gz
plan9port-61f5c35c9465f0702739b41249a664d409f0482c.zip
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+/*
+ *
+ * PostScript picture inclusion routines. Support for managing in-line pictures
+ * has been added, and works in combination with the simple picpack pre-processor
+ * that's supplied with this package. An in-line picture begins with a special
+ * device control command that looks like,
+ *
+ * x X InlinPicture name size
+ *
+ * where name is the pathname of the original picture file and size is the number
+ * of bytes in the picture, which begins immediately on the next line. When dpost
+ * encounters the InlinePicture device control command inlinepic() is called and
+ * that routine appends the string name and the integer size to a temporary file
+ * (fp_pic) and then adds the next size bytes read from the current input file to
+ * file fp_pic. All in-line pictures are saved in fp_pic and located later using
+ * the name string and picture file size that separate pictures saved in fp_pic.
+ *
+ * When a picture request (ie. an "x X PI" command) is encountered picopen() is
+ * called and it first looks for the picture file in fp_pic. If it's found there
+ * the entire picture (ie. size bytes) is copied from fp_pic to a new temp file
+ * and that temp file is used as the picture file. If there's nothing in fp_pic
+ * or if the lookup failed the original route is taken.
+ *
+ * Support for in-line pictures is an attempt to address requirements, expressed
+ * by several organizations, of being able to store a document as a single file
+ * (usually troff input) that can then be sent through dpost and ultimately to
+ * a PostScript printer. The mechanism may help some users, but the are obvious
+ * disadvantages to this approach, and the original mechanism is the recommended
+ * approach! Perhaps the most important problem is that troff output, with in-line
+ * pictures included, doesn't fit the device independent language accepted by
+ * important post-processors (like proff) and that means you won't be able to
+ * reliably preview a packed file on your 5620 (or whatever).
+ *
+ */
+
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <stdio.h>
+#include "ext.h"
+#include "common.h"
+#include "tr2post.h"
+/* PostScript file structuring comments */
+#include "comments.h"
+/* general purpose definitions */
+/* #include "gen.h" */
+/* just for TEMPDIR definition */
+#include "path.h"
+/* external variable declarations */
+/* #include "ext.h" */
+
+Biobuf *bfp_pic = NULL;
+Biobuf *Bfp_pic;
+Biobuf *picopen(char *);
+
+#define MAXGETFIELDS 16
+char *fields[MAXGETFIELDS];
+int nfields;
+
+extern int devres, hpos, vpos;
+extern int picflag;
+
+/*****************************************************************************/
+
+void
+picture(Biobuf *inp, char *buf) {
+ int poffset; /* page offset */
+ int indent; /* indent */
+ int length; /* line length */
+ int totrap; /* distance to next trap */
+ char name[100]; /* picture file and page string */
+ char hwo[40], *p; /* height, width and offset strings */
+ char flags[20]; /* miscellaneous stuff */
+ int page = 1; /* page number pulled from name[] */
+ double frame[4]; /* height, width, y, and x offsets from hwo[] */
+ char units; /* scale indicator for frame dimensions */
+ int whiteout = 0; /* white out the box? */
+ int outline = 0; /* draw a box around the picture? */
+ int scaleboth = 0; /* scale both dimensions? */
+ double adjx = 0.5; /* left-right adjustment */
+ double adjy = 0.5; /* top-bottom adjustment */
+ double rot = 0; /* rotation in clockwise degrees */
+ Biobuf *fp_in; /* for *name */
+ int i; /* loop index */
+
+/*
+ *
+ * Called from devcntrl() after an 'x X PI' command is found. The syntax of that
+ * command is:
+ *
+ * x X PI:args
+ *
+ * with args separated by colons and given by:
+ *
+ * poffset
+ * indent
+ * length
+ * totrap
+ * file[(page)]
+ * height[,width[,yoffset[,xoffset]]]
+ * [flags]
+ *
+ * poffset, indent, length, and totrap are given in machine units. height, width,
+ * and offset refer to the picture frame in inches, unless they're followed by
+ * the u scale indicator. flags is a string that provides a little bit of control
+ * over the placement of the picture in the frame. Rotation of the picture, in
+ * clockwise degrees, is set by the a flag. If it's not followed by an angle
+ * the current rotation angle is incremented by 90 degrees, otherwise the angle
+ * is set by the number that immediately follows the a.
+ *
+ */
+
+ if (!picflag) /* skip it */
+ return;
+ endstring();
+
+ flags[0] = '\0'; /* just to be safe */
+
+ nfields = getfields(buf, fields, MAXGETFIELDS, 0, ":\n");
+ if (nfields < 6) {
+ error(WARNING, "too few arguments to specify picture");
+ return;
+ }
+ poffset = atoi(fields[1]);
+ indent = atoi(fields[2]);
+ length = atoi(fields[3]);
+ totrap = atoi(fields[4]);
+ strncpy(name, fields[5], sizeof(name));
+ strncpy(hwo, fields[6], sizeof(hwo));
+ if (nfields >= 6)
+ strncpy(flags, fields[7], sizeof(flags));
+
+ nfields = getfields(buf, fields, MAXGETFIELDS, 0, "()");
+ if (nfields == 2) {
+ strncpy(name, fields[0], sizeof(name));
+ page = atoi(fields[1]);
+ }
+
+ if ((fp_in = picopen(name)) == NULL) {
+ error(WARNING, "can't open picture file %s\n", name);
+ return;
+ }
+
+ frame[0] = frame[1] = -1; /* default frame height, width */
+ frame[2] = frame[3] = 0; /* and y and x offsets */
+
+ for (i = 0, p = hwo-1; i < 4 && p != NULL; i++, p = strchr(p, ','))
+ if (sscanf(++p, "%lf%c", &frame[i], &units) == 2)
+ if (units == 'i' || units == ',' || units == '\0')
+ frame[i] *= devres;
+
+ if (frame[0] <= 0) /* check what we got for height */
+ frame[0] = totrap;
+
+ if (frame[1] <= 0) /* and width - check too big?? */
+ frame[1] = length - indent;
+
+ frame[3] += poffset + indent; /* real x offset */
+
+ for (i = 0; flags[i]; i++)
+ switch (flags[i]) {
+ case 'c': adjx = adjy = 0.5; break; /* move to the center */
+ case 'l': adjx = 0; break; /* left */
+ case 'r': adjx = 1; break; /* right */
+ case 't': adjy = 1; break; /* top */
+ case 'b': adjy = 0; break; /* or bottom justify */
+ case 'o': outline = 1; break; /* outline the picture */
+ case 'w': whiteout = 1; break; /* white out the box */
+ case 's': scaleboth = 1; break; /* scale both dimensions */
+ case 'a': if ( sscanf(&flags[i+1], "%lf", &rot) != 1 )
+ rot += 90;
+ }
+
+ /* restore(); */
+ endstring();
+ Bprint(Bstdout, "cleartomark\n");
+ Bprint(Bstdout, "saveobj restore\n");
+
+ ps_include(fp_in, Bstdout, page, whiteout, outline, scaleboth,
+ frame[3]+frame[1]/2, -vpos-frame[2]-frame[0]/2, frame[1], frame[0], adjx, adjy, -rot);
+ /* save(); */
+ Bprint(Bstdout, "/saveobj save def\n");
+ Bprint(Bstdout, "mark\n");
+ Bterm(fp_in);
+
+}
+
+/*
+ *
+ * Responsible for finding and opening the next picture file. If we've accumulated
+ * any in-line pictures fp_pic won't be NULL and we'll look there first. If *path
+ * is found in *fp_pic we create another temp file, open it for update, unlink it,
+ * copy in the picture, seek back to the start of the new temp file, and return
+ * the file pointer to the caller. If fp_pic is NULL or the lookup fails we just
+ * open file *path and return the resulting file pointer to the caller.
+ *
+ */
+Biobuf *
+picopen(char *path) {
+/* char name[100]; /* pathnames */
+/* long pos; /* current position */
+/* long total; /* and sizes - from *fp_pic */
+ Biobuf *bfp;
+ Biobuf *Bfp; /* and pointer for the new temp file */
+
+
+ if ((bfp = Bopen(path, OREAD)) == 0)
+ error(FATAL, "can't open %s\n", path);
+ Bfp = bfp;
+ return(Bfp);
+#ifdef UNDEF
+ if (Bfp_pic != NULL) {
+ Bseek(Bfp_pic, 0L, 0);
+ while (Bgetfield(Bfp_pic, 's', name, 99)>0
+ && Bgetfield(Bfp_pic, 'd', &total, 0)>0) {
+ pos = Bseek(Bfp_pic, 0L, 1);
+ if (strcmp(path, name) == 0) {
+ if (tmpnam(pictmpname) == NULL)
+ error(FATAL, "can't generate temp file name");
+ if ( (bfp = Bopen(pictmpname, ORDWR)) == NULL )
+ error(FATAL, "can't open %s", pictmpname);
+ Bfp = bfp;
+ piccopy(Bfp_pic, Bfp, total);
+ Bseek(Bfp, 0L, 0);
+ return(Bfp);
+ }
+ Bseek(Bfp_pic, total+pos, 0);
+ }
+ }
+ if ((bfp = Bopen(path, OREAD)) == 0)
+ Bfp = 0;
+ else
+ Bfp = bfp;
+ return(Bfp);
+#endif
+}
+
+/*
+ *
+ * Adds an in-line picture file to the end of temporary file *Bfp_pic. All pictures
+ * grabbed from the input file are saved in the same temp file. Each is preceeded
+ * by a one line header that includes the original picture file pathname and the
+ * size of the picture in bytes. The in-line picture file is opened for update,
+ * left open, and unlinked so it disappears when we do.
+ *
+ */
+/* *fp; /* current input file */
+/* *buf; /* whatever followed "x X InlinePicture" */
+
+#ifdef UNDEF
+void
+inlinepic(Biobuf *Bfp, char *buf) {
+ char name[100]; /* picture file pathname */
+ long total; /* and size - both from *buf */
+
+
+ if (Bfp_pic == NULL ) {
+ tmpnam(pictmpname);
+ if ((bfp_pic = Bopen(pictmpname, ORDWR)) == 0)
+ error(FATAL, "can't open in-line picture file %s", ipictmpname);
+ unlink(pictmpname);
+ }
+
+ if ( sscanf(buf, "%s %ld", name, &total) != 2 )
+ error(FATAL, "in-line picture error");
+
+ fseek(Bfp_pic, 0L, 2);
+ fprintf(Bfp_pic, "%s %ld\n", name, total);
+ getc(fp);
+ fflush(fp_pic);
+ piccopy(fp, fp_pic, total);
+ ungetc('\n', fp);
+
+}
+#endif
+
+/*
+ *
+ * Copies total bytes from file fp_in to fp_out. Used to append picture files to
+ * *fp_pic and then copy them to yet another temporary file immediately before
+ * they're used (in picture()).
+ *
+ */
+/* *fp_in; input */
+/* *fp_out; and output file pointers */
+/* total; number of bytes to be copied */
+void
+piccopy(Biobuf *Bfp_in, Biobuf *Bfp_out, long total) {
+ long i;
+
+ for (i = 0; i < total; i++)
+ if (Bputc(Bfp_out, Bgetc(Bfp_in)) < 0)
+ error(FATAL, "error copying in-line picture file");
+ Bflush(Bfp_out);
+}