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cpdf-source
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Fix tags, artifacts

This commit is contained in:
John Whitington 2024-09-25 14:35:21 +01:00
parent b676ab4923
commit 01fcd13251
2 changed files with 12 additions and 6 deletions
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16
cpdfdraw.ml
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@ -429,7 +429,7 @@ let rec ops_of_drawop struct_tree dryrun pdf endpage filename bates batespad num
[]
| TextSection ops ->
let m = mcid () in
if not dryrun then structdata := StDataMCID ("P", m, None)::!structdata;
if not dryrun then structdata := StDataMCID ("/P", m, None)::!structdata;
(if struct_tree && !do_auto_tag then [Pdfops.Op_BDC ("/P", Pdf.Dictionary ["/MCID", Pdf.Integer m])] else [])
@ [Pdfops.Op_BT]
@ ops_of_drawops struct_tree dryrun pdf endpage filename bates batespad num page ops
@ -459,10 +459,10 @@ let rec ops_of_drawop struct_tree dryrun pdf endpage filename bates batespad num
| Newline -> [Pdfops.Op_T']
| Tag s ->
let m = mcid () in
if not dryrun then structdata := StDataMCID (s, m, None)::!structdata;
if not dryrun then structdata := StDataMCID ("/" ^ s, m, None)::!structdata;
[Pdfops.Op_BDC ("/" ^ s, Pdf.Dictionary ["/MCID", Pdf.Integer m])]
| EndTag -> [Pdfops.Op_EMC]
| STag s -> if not dryrun then structdata =| StDataBeginTree s; []
| STag s -> if not dryrun then structdata =| StDataBeginTree ("/" ^ s); []
| EndSTag -> if not dryrun then structdata =| StDataEndTree; []
| BeginArtifact -> [Pdfops.Op_BMC "/BeginArtifact"]
| EndArtifact -> [Pdfops.Op_BMC "/EndArtifact"]
@ -569,6 +569,12 @@ let add_artifacts ops =
in
loop [] ops
(* When no automatic artifacting, we still need to fix our backchannel manual artifacts. *)
let fixup_manual_artifacts =
map (function Pdfops.Op_BMC "/BeginArtifact" -> Pdfops.Op_BMC "/Artifact"
| Pdfops.Op_BMC "/EndArtifact" -> Pdfops.Op_EMC
| x -> x)
let draw_single ~struct_tree ~fast ~underneath ~filename ~bates ~batespad range pdf drawops =
(res ()).num <- max (res ()).num (minimum_resource_number pdf range);
let endpage = Pdfpage.endpage pdf in
@ -594,7 +600,7 @@ let draw_single ~struct_tree ~fast ~underneath ~filename ~bates ~batespad range
map3
(fun n p ops ->
if not (mem n range) then p else
let ops = if struct_tree && !do_add_artifacts then add_artifacts ops else ops in
let ops = if struct_tree && !do_add_artifacts then add_artifacts ops else fixup_manual_artifacts ops in
let page = {p with Pdfpage.resources = update_resources pdf p.Pdfpage.resources} in
(if underneath then Pdfpage.prepend_operators else Pdfpage.postpend_operators) pdf ops ~fast page)
(ilist 1 endpage)
@ -692,7 +698,7 @@ let write_structure_tree pdf st =
(alt
@ page
@ namespace
@ [("/S", Pdf.Name ("/" ^ kind));
@ [("/S", Pdf.Name kind);
("/P", Pdf.Indirect struct_tree_parent);
("/K", Pdf.Array (map (mktree this_objnum) children))])
in

2
cpdfmanual.tex
View File

@ -5205,7 +5205,7 @@ $cpdf -print-struct-tree out.pdf
StructTreeRoot
└── P (1)\end{verbatim}
\noindent To prevent such automatic tagging, relying only on manual tags, use \texttt{-no-auto-tags}. The effect may be reversed at any point with \texttt{-auto-tags}. Unless told otherwise, Cpdf auto-tags text as paragraphs /P, and images as /Figure.
\noindent To prevent such automatic tagging, relying only on manual tags, use \texttt{-no-auto-tags}. The effect may be reversed at any point with \texttt{-auto-tags}. Unless told otherwise, Cpdf auto-tags text as paragraphs P, and images as Figure.
There are two types of tag we can add manually. One kind is used to tag individual pieces of content. We do this with a \texttt{-tag}/\texttt{-end-tag} pair. Note that nesting is not permitted here. For example, let us tag a heading: