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cpdf-source
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John Whitington 2021-10-21 13:51:14 +01:00
parent a2d52196f6
commit e0ac35ad7d
1 changed files with 17 additions and 5 deletions
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22
cpdf.ml
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@ -2767,7 +2767,19 @@ let combine_pdf_rests pdf a b =
Pdf.Dictionary (unknown_keys_a @ unknown_keys_b @ combined_known_entries) Pdf.Dictionary (unknown_keys_a @ unknown_keys_b @ combined_known_entries)
(* Calculate the transformation matrices for a single imposed output page. *) (* Calculate the transformation matrices for a single imposed output page. *)
let impose_transforms fx fy columns rtl btt center margin spacing linewidth mediabox len = let make_margin output_mediabox margin tr =
if margin = 0. then tr else
let width, height =
match Pdf.parse_rectangle output_mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
if margin > width /. 2. || margin > height /. 2. then error "margin would fill whole page!" else
let factor = (width -. margin -. margin) /. width in
let scale = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), factor, factor)) in
let shift = Pdftransform.matrix_of_op (Pdftransform.Translate (margin, margin)) in
(Pdftransform.matrix_compose shift (Pdftransform.matrix_compose scale tr))
let impose_transforms fx fy columns rtl btt center margin spacing linewidth mediabox output_mediabox len =
let width, height = let width, height =
match Pdf.parse_rectangle mediabox with match Pdf.parse_rectangle mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
@ -2805,15 +2817,15 @@ let impose_transforms fx fy columns rtl btt center margin spacing linewidth medi
len := !len - 1 len := !len - 1
done done
done; done;
rev !trs map (make_margin output_mediabox margin) (rev !trs)
(* Combine two pages into one throughout the document. The pages have already (* Combine two pages into one throughout the document. The pages have already
had their objects renumbered so as not to clash. *) had their objects renumbered so as not to clash. *)
let impose_pages x y columns rtl btt center margin spacing linewidth mediabox' fast pdf = function let impose_pages x y columns rtl btt center margin spacing linewidth output_mediabox fast pdf = function
| [] -> assert false | [] -> assert false
| (h::_) as pages -> | (h::_) as pages ->
let transforms = let transforms =
impose_transforms x y columns rtl btt center margin spacing linewidth h.Pdfpage.mediabox (length pages) impose_transforms x y columns rtl btt center margin spacing linewidth h.Pdfpage.mediabox output_mediabox (length pages)
in in
(* Change the pattern matrices before combining resources *) (* Change the pattern matrices before combining resources *)
let pages, h = let pages, h =
@ -2859,7 +2871,7 @@ let impose_pages x y columns rtl btt center margin spacing linewidth mediabox' f
pages pages
transforms) transforms)
in in
{Pdfpage.mediabox = mediabox'; {Pdfpage.mediabox = output_mediabox;
Pdfpage.rotate = h.Pdfpage.rotate; Pdfpage.rotate = h.Pdfpage.rotate;
Pdfpage.content = content'; Pdfpage.content = content';
Pdfpage.resources = resources'; Pdfpage.resources = resources';