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Cleaning up change_pattern_matrices

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This commit is contained in:
John Whitington 2019-07-16 13:05:06 +01:00
parent 1134d88635
commit 8712d7078f
1 changed files with 75 additions and 121 deletions

196
cpdf.ml

@ -2188,74 +2188,65 @@ let change_boxes f pdf page =
make_mediabox (f (Pdf.parse_rectangle page.Pdfpage.mediabox)); make_mediabox (f (Pdf.parse_rectangle page.Pdfpage.mediabox));
Pdfpage.rest = rest'} Pdfpage.rest = rest'}
(* The content is flipped by altering any use of [Op_cm]. But we must also let process_xobject f pdf resources i =
alter any /Matrix entries in pattern dictionaries for tiled and shading let xobj = Pdf.lookup_obj pdf i in
patterns. In addition, shadings used by Op_sh in the main page content and in match Pdf.lookup_direct pdf "/Subtype" xobj with
xobjects must be altered. *) | None -> raise (Pdf.PDFError "No /Subtype in Xobject")
| Some (Pdf.Name "/Form") ->
Pdf.getstream xobj;
begin match xobj with
| Pdf.Stream ({contents = Pdf.Dictionary dict, Pdf.Got bytes} as rf) ->
begin match f pdf resources [Pdf.Stream rf] with
| [Pdf.Stream {contents = (Pdf.Dictionary dict', data)}] ->
let dict' =
Pdf.remove_dict_entry
(Pdf.Dictionary (mergedict dict dict'))
"/Filter"
in
rf := (dict', data)
| _ -> assert false
end
| _ -> assert false (* getstream would have complained already *)
end
| Some _ -> ()
(*let transform_shading tr s = s let process_xobjects pdf page f =
match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
| Some (Pdf.Dictionary elts) ->
iter
(fun (k, v) ->
match v with
| Pdf.Indirect i -> process_xobject f pdf page.Pdfpage.resources i
| _ -> raise (Pdf.PDFError "process_xobject"))
elts
| _ -> ()
let change_shadings pdf tr shadingdict = (* The content transformed by altering any use of [Op_cm]. But we must also
match Pdf.direct pdf shadingdict with alter any /Matrix entries in pattern dictionaries *)
| Pdf.Dictionary shadings -> let change_pattern_matrices_page pdf tr page =
let shadings' =
map
(fun (name, shading) ->
Printf.printf "Fixing up shading %s\n" name;
(name, Pdf.Indirect (Pdf.addobj pdf (transform_shading tr shading))))
shadings
in
Pdf.Dictionary shadings'
| _ -> raise (Pdf.PDFError "not a shading dictionary")
let change_shadings_xobject pdf tr xobject =
match Pdf.lookup_direct pdf "/Shading" xobject with
| Some ss -> Pdf.add_dict_entry xobject "/Shading" (change_shadings pdf tr ss)
| None -> xobject
let change_shadings pdf tr resources =
match Pdf.lookup_direct pdf "/XObject" resources with
| Some (Pdf.Dictionary xobjects) ->
let entries =
map
(fun (name, xobject) ->
Printf.printf "Looking for shadings in xobject %s\n" name;
name, Pdf.Indirect (Pdf.addobj pdf (change_shadings_xobject pdf tr xobject)))
xobjects
in
Pdf.add_dict_entry resources "/XObject" (Pdf.Dictionary entries)
| _ -> resources*)
(* FIXME: Why doesn't this do patterns in xobjects? Are they always in page space not xobject space? Is change_shadings a wild goose chase? *)
let change_pattern_matrices pdf tr resources =
try try
(*let resources = change_shadings pdf tr resources in*) begin match Pdf.lookup_direct pdf "/Pattern" page.Pdfpage.resources with
begin match Pdf.lookup_direct pdf "/Pattern" resources with | Some (Pdf.Dictionary patterns) ->
| Some (Pdf.Dictionary patterns) -> let entries =
let names, nums = map
split (fun (name, p) ->
(map let old_pattern = Pdf.direct pdf p in
(fun (name, p) -> let new_pattern =
let old_pattern = Pdf.direct pdf p in let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in
let new_pattern = let new_tr = Pdftransform.matrix_compose (Pdftransform.matrix_invert tr) existing_tr in
let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in Pdf.add_dict_entry old_pattern "/Matrix" (Pdf.make_matrix new_tr)
let new_tr = Pdftransform.matrix_compose (Pdftransform.matrix_invert tr) existing_tr in in
Pdf.add_dict_entry old_pattern "/Matrix" (Pdf.make_matrix new_tr) name, Pdf.Indirect (Pdf.addobj pdf new_pattern))
in patterns
name, Pdf.addobj pdf new_pattern) in
patterns) {page with Pdfpage.resources =
in Pdf.add_dict_entry page.Pdfpage.resources "/Pattern" (Pdf.Dictionary entries)}
let entries = | _ -> page
map2 (fun name num -> name, Pdf.Indirect num) names nums end
in with
Pdf.add_dict_entry resources "/Pattern" (Pdf.Dictionary entries) Pdftransform.NonInvertable ->
| _ -> resources Printf.eprintf "Warning: noninvertible matrix";
end page
with
Pdftransform.NonInvertable ->
Printf.eprintf "Warning: noninvertible matrix";
resources
(* Apply transformations to any annotations in /Annots (i.e their /Rect entries) *) (* Apply transformations to any annotations in /Annots (i.e their /Rect entries) *)
let transform_annotations pdf transform rest = let transform_annotations pdf transform rest =
@ -2292,11 +2283,11 @@ let shift_page ?(fast=false) dxdylist pdf pnum page =
let transform_op = let transform_op =
Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy))) Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy)))
in in
let resources' = let page =
change_pattern_matrices pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page.Pdfpage.resources change_pattern_matrices_page pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page
in in
transform_annotations pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page.Pdfpage.rest; transform_annotations pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'} Pdfpage.prepend_operators pdf [transform_op] ~fast page
let shift_pdf ?(fast=false) dxdylist pdf range = let shift_pdf ?(fast=false) dxdylist pdf range =
process_pages (shift_page ~fast dxdylist pdf) pdf range process_pages (shift_page ~fast dxdylist pdf) pdf range
@ -2322,11 +2313,9 @@ let flip_page ?(fast=false) transform_op pdf _ page =
Pdf.parse_rectangle page.Pdfpage.mediabox Pdf.parse_rectangle page.Pdfpage.mediabox
in in
let tr = transform_op minx miny maxx maxy in let tr = transform_op minx miny maxx maxy in
let resources = let page = change_pattern_matrices_page pdf tr page in
change_pattern_matrices pdf tr page.Pdfpage.resources
in
transform_annotations pdf tr page.Pdfpage.rest; transform_annotations pdf tr page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast {page with Pdfpage.resources = resources} Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast page
let vflip_pdf ?(fast=false) pdf range = let vflip_pdf ?(fast=false) pdf range =
let transform_op _ miny _ maxy = let transform_op _ miny _ maxy =
@ -2414,8 +2403,7 @@ let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isov
in in
transform_annotations pdf matrix o.Pdfpage.rest; transform_annotations pdf matrix o.Pdfpage.rest;
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
{r with Pdfpage.resources = change_pattern_matrices_page pdf matrix r
change_pattern_matrices pdf matrix r.Pdfpage.resources}
else else
let sw = sxmax -. sxmin and sh = symax -. symin let sw = sxmax -. sxmin and sh = symax -. symin
and w = txmax -. txmin and h = tymax -. tymin in and w = txmax -. txmin and h = tymax -. tymin in
@ -2427,8 +2415,7 @@ let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isov
in in
transform_annotations pdf matrix o.Pdfpage.rest; transform_annotations pdf matrix o.Pdfpage.rest;
let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in
{r with Pdfpage.resources = change_pattern_matrices_page pdf matrix r
change_pattern_matrices pdf matrix r.Pdfpage.resources}
in in
{u with {u with
Pdfpage.content = Pdfpage.content =
@ -2750,9 +2737,9 @@ let rotate_page_contents ~fast rotpoint r pdf _ page =
(Pdftransform.Rotate (rotation_point, rad_of_deg r)) (Pdftransform.Rotate (rotation_point, rad_of_deg r))
in in
let transform_op = Pdfops.Op_cm tr in let transform_op = Pdfops.Op_cm tr in
let resources' = change_pattern_matrices pdf tr2 page.Pdfpage.resources in let page = change_pattern_matrices_page pdf tr2 page in
transform_annotations pdf tr page.Pdfpage.rest; transform_annotations pdf tr page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'} Pdfpage.prepend_operators pdf [transform_op] ~fast page
let rotate_contents ?(fast=false) r pdf range = let rotate_contents ?(fast=false) r pdf range =
process_pages (rotate_page_contents ~fast None r pdf) pdf range process_pages (rotate_page_contents ~fast None r pdf) pdf range
@ -2794,9 +2781,9 @@ let transform_boxes tr pdf page =
let transform_contents ?(fast=false) tr pdf page = let transform_contents ?(fast=false) tr pdf page =
let transform_op = Pdfops.Op_cm tr in let transform_op = Pdfops.Op_cm tr in
let resources' = change_pattern_matrices pdf (Pdftransform.matrix_invert tr) page.Pdfpage.resources in let page = change_pattern_matrices_page pdf (Pdftransform.matrix_invert tr) page in
transform_annotations pdf tr page.Pdfpage.rest; transform_annotations pdf tr page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'} Pdfpage.prepend_operators pdf [transform_op] ~fast page
let upright ?(fast=false) range pdf = let upright ?(fast=false) range pdf =
if allupright range pdf then pdf else if allupright range pdf then pdf else
@ -2819,11 +2806,11 @@ let scale_pdf ?(fast=false) sxsylist pdf range =
and matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), sx, sy)) in and matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), sx, sy)) in
let transform_op = let transform_op =
Pdfops.Op_cm matrix Pdfops.Op_cm matrix
and resources' = and page =
change_pattern_matrices pdf (Pdftransform.matrix_invert matrix) page.Pdfpage.resources change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page
in in
transform_annotations pdf matrix page.Pdfpage.rest; transform_annotations pdf matrix page.Pdfpage.rest;
Pdfpage.prepend_operators pdf ~fast [transform_op] {page with Pdfpage.resources = resources'} Pdfpage.prepend_operators pdf ~fast [transform_op] page
in in
process_pages scale_page pdf range process_pages scale_page pdf range
@ -2864,7 +2851,7 @@ let scale_to_fit_pdf ?(fast=false) position input_scale xylist op pdf range =
in in
transform_annotations pdf matrix page.Pdfpage.rest; transform_annotations pdf matrix page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast
{page with Pdfpage.resources = change_pattern_matrices pdf (Pdftransform.matrix_invert matrix) page.Pdfpage.resources} (change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page)
in in
process_pages scale_page_to_fit pdf range process_pages scale_page_to_fit pdf range
@ -2897,10 +2884,9 @@ let scale_page_contents ?(fast=false) scale position pdf _ page =
Pdftransform.Scale ((sx, sy), scale, scale)] Pdftransform.Scale ((sx, sy), scale, scale)]
in in
let transform_op = Pdfops.Op_cm transform in let transform_op = Pdfops.Op_cm transform in
let resources' = change_pattern_matrices pdf transform page.Pdfpage.resources in let page = change_pattern_matrices_page pdf transform page in
transform_annotations pdf transform page.Pdfpage.rest; transform_annotations pdf transform page.Pdfpage.rest;
Pdfpage.prepend_operators pdf [transform_op] ~fast Pdfpage.prepend_operators pdf [transform_op] ~fast page
{page with Pdfpage.resources = resources'}
let scale_contents ?(fast=false) position scale pdf range = let scale_contents ?(fast=false) position scale pdf range =
process_pages (scale_page_contents ~fast scale position pdf) pdf range process_pages (scale_page_contents ~fast scale position pdf) pdf range
@ -3200,7 +3186,7 @@ let twoup_pages_inner isstack fast pdf = function
let pages, h = let pages, h =
let r = let r =
List.map2 List.map2
(fun p t -> {p with Pdfpage.resources = change_pattern_matrices pdf t p.Pdfpage.resources}) (fun p t -> change_pattern_matrices_page pdf t p)
pages transforms pages transforms
in in
r, List.hd r r, List.hd r
@ -3751,38 +3737,6 @@ let blacktext_ops (r, g, b) pdf resources content =
[Pdfops.stream_of_ops operators'] [Pdfops.stream_of_ops operators']
(* Blacken a form xobject, writing it to the same object. *) (* Blacken a form xobject, writing it to the same object. *)
let process_xobject f pdf resources i =
let xobj = Pdf.lookup_obj pdf i in
match Pdf.lookup_direct pdf "/Subtype" xobj with
| None -> raise (Pdf.PDFError "No /Subtype in Xobject")
| Some (Pdf.Name "/Form") ->
Pdf.getstream xobj;
begin match xobj with
| Pdf.Stream ({contents = Pdf.Dictionary dict, Pdf.Got bytes} as rf) ->
begin match f pdf resources [Pdf.Stream rf] with
| [Pdf.Stream {contents = (Pdf.Dictionary dict', data)}] ->
let dict' =
Pdf.remove_dict_entry
(Pdf.Dictionary (mergedict dict dict'))
"/Filter"
in
rf := (dict', data)
| _ -> assert false
end
| _ -> assert false (* getstream would have complained already *)
end
| Some _ -> ()
let process_xobjects pdf page f =
match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
| Some (Pdf.Dictionary elts) ->
iter
(fun (k, v) ->
match v with
| Pdf.Indirect i -> process_xobject f pdf page.Pdfpage.resources i
| _ -> raise (Pdf.PDFError "process_xobject"))
elts
| _ -> ()
let blacktext (r, g, b) range pdf = let blacktext (r, g, b) range pdf =
let blacktext_page _ page = let blacktext_page _ page =