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cpdf-source
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Marking artifacts

This commit is contained in:
John Whitington 2024-09-11 15:15:35 +01:00
parent e6c34277cf
commit b27c97a50a
2 changed files with 28 additions and 2 deletions
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4
cpdfcommand.ml
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@ -2828,8 +2828,8 @@ let specs =
("-use", Arg.String Cpdfdrawcontrol.usexobj, " Use a saved sequence of graphics operators");
("-draw-jpeg", Arg.String Cpdfdrawcontrol.addjpeg, " Load a JPEG from file and name it");
("-draw-png", Arg.String Cpdfdrawcontrol.addpng, " Load a PNG from file and name it");
("-image", Arg.String (fun s -> Cpdfdrawcontrol.addimage ?title:args.image_title s), " Draw an image which has already been loaded");
("-image-title", Arg.String (fun s -> args.image_title <- Some s), " Give title for future images");
("-image", Arg.String (fun s -> Cpdfdrawcontrol.addimage ?title:args.image_title s; args.image_title <- None), " Draw an image which has already been loaded");
("-image-title", Arg.String (fun s -> args.image_title <- Some s), " Give title for the next -image");
("-fill-opacity", Arg.Float Cpdfdrawcontrol.addopacity, " Set opacity");
("-stroke-opacity", Arg.Float Cpdfdrawcontrol.addsopacity, " Set stroke opacity");
("-bt", Arg.Unit Cpdfdrawcontrol.addbt, " Begin text");

26
cpdfdraw.ml
View File

@ -395,6 +395,31 @@ let save_whole_stack () =
let restore_whole_stack r =
resstack := r
(* Mark as an artifact anything not already marked. *)
let add_artifacts ops =
let content = ref false in
let artifact = ref false in
let rec loop a = function
| [] ->
(* The end. Must end artifact if in artifact. *)
if !artifact then rev (Pdfops.Op_EMC::a) else rev a
| Pdfops.Op_BDC _ as h::t ->
(* Entering content. If in artifact, must end artifact. *)
let a' = if !artifact then h::Pdfops.Op_EMC::a else h::a in
set content; clear artifact; loop a' t
| Pdfops.Op_EMC as h::t ->
(* Exiting content. *)
clear content;
loop (h::a) t
| h::t ->
(* A normal operation. If not in content or artifact must start artifact. *)
let a' =
if not (!content || !artifact) then (set artifact; h::Pdfops.Op_BMC "/Artifact"::a) else h::a
in
loop a' t
in
loop [] ops
let draw_single ~fast ~underneath ~filename ~bates ~batespad range pdf drawops =
(res ()).num <- max (res ()).num (minimum_resource_number pdf range);
let endpage = Pdfpage.endpage pdf in
@ -420,6 +445,7 @@ let draw_single ~fast ~underneath ~filename ~bates ~batespad range pdf drawops =
map3
(fun n p ops ->
if not (mem n range) then p else
let ops = add_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)