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John Whitington
2023-04-11 18:22:30 +01:00
parent c04627eae8
commit 0b3ca7ef7b
1 changed files with 6 additions and 13 deletions
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cpdfpage.ml
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@@ -4,18 +4,14 @@ open Cpdferror
(* FIXME: Need to take account of inherited resources (among Xobjects and their children - pages
are regularized upon loading). Would be nice to see a failing example first though.
FIXME: What would happen if a pattern was used in a transforming and non-transforming way - we
would have to dedupulicate - again, no failing example available.
FIXME: combine change_annotation_matrices, change_pattern_matrices and change_softmask_matrices
into one *)
would have to dedupulicate - again, no failing example available. *)
(* Transparency group soft masks appear to need altering with the inverse of
the transformation matrix. We find them all, deduplicate, and then process
in place. *)
(* FIXME sub-xobjects! *)
(* For each xobject, look in /Resources -> /ExtGState -> /G, and get object number. *)
let rec change_softmask_matrices_xobject pdf xobject =
Printf.printf "change_softmask_matrices_xobject: %s\n" (Pdfwrite.string_of_pdf xobject);
let objnums = ref [] in
begin match xobject with
| Pdf.Indirect i ->
@@ -24,16 +20,14 @@ let rec change_softmask_matrices_xobject pdf xobject =
| Some d ->
begin match Pdf.lookup_direct pdf "/ExtGState" d with
| Some (Pdf.Dictionary extgstates) ->
Printf.printf "Found %i extgstates to examine\n" (length extgstates);
iter
(function extgstate ->
match Pdf.direct pdf extgstate with
| Pdf.Dictionary d ->
begin match lookup "/SMask" d with
begin match Pdf.lookup_direct pdf "/SMask" (Pdf.Dictionary d) with
| Some (Pdf.Dictionary d) ->
begin match lookup "/G" d with
| Some (Pdf.Indirect i) ->
Printf.printf "Collecting objnum %i\n" i;
objnums := i::!objnums
| _ -> ()
end
@@ -67,7 +61,6 @@ let change_softmask_matrices_page pdf tr page =
| Some (Pdf.Dictionary d) -> d
| _ -> []
in
Printf.printf "** page has %i xobjects to process\n" (length xobjects);
let objnums = setify (flatten (map (change_softmask_matrices_xobject pdf) (map snd xobjects))) in
iter
(fun objnum ->
@@ -100,7 +93,7 @@ let rec change_pattern_matrices_resources pdf tr resources names_used_with_scn =
(fun (k, v) ->
match v with
| Pdf.Indirect i ->
Printf.printf "Processing form xobject %s for patterns\n" k;
(*Printf.printf "Processing form xobject %s for patterns\n" k;*)
change_pattern_matrices_xobject pdf tr v i
| _ -> raise (Pdf.PDFError "change_pattern_matrices_page"))
elts
@@ -114,7 +107,7 @@ let rec change_pattern_matrices_resources pdf tr resources names_used_with_scn =
match Hashtbl.find names_used_with_scn name with
| exception Not_found -> (name, p)
| _ ->
Printf.printf "Changing matrices of pattern %s\n" name;
(*Printf.printf "Changing matrices of pattern %s\n" name;*)
let old_pattern = Pdf.direct pdf p in
let new_pattern =
let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in
@@ -148,9 +141,9 @@ and change_pattern_matrices_xobject pdf tr xobj xobjnum =
let change_pattern_matrices_page pdf tr page =
change_softmask_matrices_page pdf tr page;
let used = patterns_used pdf page.Pdfpage.content page.Pdfpage.resources in
Printf.printf "Patterns for translation, due to being used as cs / CS";
(*Printf.printf "Patterns for translation, due to being used as cs / CS";
Hashtbl.iter (fun x _ -> Printf.printf "%s " x) used;
Printf.printf "\n";
Printf.printf "\n";*)
{page with Pdfpage.resources = change_pattern_matrices_resources pdf tr page.Pdfpage.resources used}
(* Concatenate inverse matrix to each /Matrix entry in those object numbers. *)