Rough pdfmark support. Links are implemented, but not outlines.

git-svn-id: svn://svn.tartarus.org/sgt/halibut@6949 cda61777-01e9-0310-a592-d414129be87e

diff --git a/bk_ps.c b/bk_ps.c
index 8951366..f66420a 100644 (file)
--- a/bk_ps.c
+++ b/bk_ps.c
@@ -7,6 +7,7 @@
 #include "paper.h"
 
 static void ps_comment(FILE *fp, char const *leader, word *words);
+static void ps_string(FILE *fp, char const *str);
 
 paragraph *ps_config_filename(char *filename)
 {
@@ -58,7 +59,7 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
        /* XXX This may request the same font multiple times. */
        if (!fe->font->info->fp)
            fprintf(fp, "%%%%+ font %s\n", fe->font->info->name);
-    fprintf(fp, "%%%%DocumentSuppliedResources: procset Halibut 0 1\n");
+    fprintf(fp, "%%%%DocumentSuppliedResources: procset Halibut 0 2\n");
     for (fe = doc->fonts->head; fe; fe = fe->next)
        /* XXX This may request the same font multiple times. */
        if (fe->font->info->fp)
@@ -66,7 +67,7 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
     fprintf(fp, "%%%%EndComments\n");
 
     fprintf(fp, "%%%%BeginProlog\n");
-    fprintf(fp, "%%%%BeginResource: procset Halibut 0 1\n");
+    fprintf(fp, "%%%%BeginResource: procset Halibut 0 2\n");
     /*
      * Supply a prologue function which allows a reasonably
      * compressed representation of the text on the pages.
@@ -90,6 +91,27 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
            "/t { tdict begin {dup type exec} forall end pop } bind def\n"
            "/r { 4 2 roll moveto 1 index 0 rlineto 0 exch rlineto\n"
            "     neg 0 rlineto closepath fill } bind def\n");
+    /*
+     * pdfmark wrappers
+     *
+     * "p" generates a named destination referencing this page.
+     * "x" generates a link to a named destination.
+     * "u" generates a link to a URI.
+     *
+     * They all do nothing if pdfmark is undefined.
+     */
+    fprintf(fp,
+           "/pdfmark where { pop\n"
+           "  /p { [ /Dest 3 -1 roll /View [ /XYZ null null null ]\n"
+           "       /DEST pdfmark } bind def\n"
+           "  /x { [ /Dest 3 -1 roll /Rect 5 -1 roll /Border [0 0 0 0]\n"
+           "       /Subtype /Link /ANN pdfmark } bind def\n"
+           "  /u { 2 dict dup /Subtype /URI put dup /URI 4 -1 roll put\n"
+           "       [ /Action 3 -1 roll /Rect 5 -1 roll /Border [0 0 0 0]\n"
+           "       /Subtype /Link /ANN pdfmark } bind def\n"
+           "} {\n"
+           "  [/p /x /u] { null cvx def } forall\n"
+           "} ifelse\n");
 
     fprintf(fp, "%%%%EndResource\n");
     fprintf(fp, "%%%%EndProlog\n");
@@ -115,6 +137,12 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
            doc->paper_height / FUNITS_PER_PT);
     fprintf(fp, "} if\n");
 
+    /* Request outline view if the document is converted to PDF. */
+    fprintf(fp,
+           "/pdfmark where {\n"
+           "  pop [ /PageMode /UseOutlines /DOCVIEW pdfmark\n"
+           "} if\n");
+
     for (fe = doc->fonts->head; fe; fe = fe->next) {
        /* XXX This may request the same font multiple times. */
        if (fe->font->info->fp) {
@@ -159,37 +187,43 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
     fprintf(fp, "%%%%EndSetup\n");
 
     /*
+     * Assign a destination name to each page for pdfmark purposes.
+     */
+    pageno = 0;
+    for (page = doc->pages; page; page = page->next) {
+       char *buf;
+       pageno++;
+       buf = snewn(12, char);
+       sprintf(buf, "/p%d", pageno);
+       page->spare = buf;
+    }
+
+    /*
      * Output the text and graphics.
      */
     pageno = 0;
     for (page = doc->pages; page; page = page->next) {
        text_fragment *frag, *frag_end;
        rect *r;
+       xref *xr;
        font_encoding *fe;
        int fs;
 
        pageno++;
        fprintf(fp, "%%%%Page: %d %d\n", pageno, pageno);
-       fprintf(fp, "save\n");
-#if 0
-       {
-           xref *xr;
-           /*
-            * I used this diagnostic briefly to ensure that
-            * cross-reference rectangles were being put where they
-            * should be.
-            */
-           for (xr = page->first_xref; xr; xr = xr->next) {
-               fprintf(fp, "gsave 0.7 setgray %g %g moveto",
-                       xr->lx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT);
-               fprintf(fp, " %g %g lineto %g %g lineto",
-                       xr->lx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT,
-                       xr->rx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT);
-               fprintf(fp, " %g %g lineto closepath fill grestore\n",
-                       xr->rx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT);
+       fprintf(fp, "save %s p\n", (char *)page->spare);
+       
+       for (xr = page->first_xref; xr; xr = xr->next) {
+           fprintf(fp, "[%g %g %g %g]",
+                   xr->lx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT,
+                   xr->rx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT);
+           if (xr->dest.type == PAGE) {
+               fprintf(fp, "%s x\n", (char *)xr->dest.page->spare);
+           } else {
+               ps_string(fp, xr->dest.url);
+               fprintf(fp, "u\n");
            }
        }
-#endif
 
        for (r = page->first_rect; r; r = r->next) {
            fprintf(fp, "%g %g %g %g r\n",
@@ -201,8 +235,6 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
        fe = NULL;
        fs = -1;
        while (frag) {
-           char *c;
-
            /*
             * Collect all the adjacent text fragments with the
             * same y-coordinate.
@@ -220,13 +252,8 @@ void ps_backend(paragraph *sourceform, keywordlist *keywords,
                fe = frag->fe;
                fs = frag->fontsize;
 
-               fprintf(fp, "%g(", frag->x/FUNITS_PER_PT);
-               for (c = frag->text; *c; c++) {
-                   if (*c == '(' || *c == ')' || *c == '\\')
-                       fputc('\\', fp);
-                   fputc(*c, fp);
-               }
-               fprintf(fp, ")");
+               fprintf(fp, "%g", frag->x/FUNITS_PER_PT);
+               ps_string(fp, frag->text);
 
                frag = frag->next;
            }
@@ -282,3 +309,15 @@ static void ps_comment(FILE *fp, char const *leader, word *words)
 
     fprintf(fp, "\n");
 }
+
+static void ps_string(FILE *fp, char const *str) {
+    char const *c;
+
+    fprintf(fp, "(");
+    for (c = str; *c; c++) {
+       if (*c == '(' || *c == ')' || *c == '\\')
+           fputc('\\', fp);
+       fputc(*c, fp);
+    }
+    fprintf(fp, ")");
+}