206 lines
6.4 KiB
OCaml
206 lines
6.4 KiB
OCaml
open Pdfutil
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type colspec =
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NoCol
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| RGB of float * float * float
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| Grey of float
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| CYMK of float * float * float * float
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type image =
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JPEG
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type drawops =
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| Rect of float * float * float * float
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| Bezier of float * float * float * float * float * float
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| To of float * float
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| Line of float * float
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| ClosePath
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| SetFill of colspec
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| SetStroke of colspec
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| SetLineThickness of float
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| SetLineCap of int
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| SetLineJoin of int
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| SetMiterLimit of float
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| SetDashPattern of float list * float
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| Matrix of Pdftransform.transform_matrix
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| Push
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| Pop
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| Fill
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| FillEvenOdd
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| Stroke
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| FillStroke
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| FillStrokeEvenOdd
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| Clip
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| ClipEvenOdd
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| SoftXObject of drawops list
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| HardXObject of drawops list
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| Image of string
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| ImageXObject of string * Pdf.pdfobject
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| NewPage
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| Opacity of float
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| SOpacity of float
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| Font of Pdftext.standard_font * float
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| BT
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| ET
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| Text of string
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| Newline
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| Leading of float
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| CharSpace of float
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| WordSpace of float
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| TextScale of float
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| RenderMode of int
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| Rise of float
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| URL of string
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| EndURL
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(* Hash table of (human name, (resources name, object)) for image xobjects *)
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let images = null_hash ()
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let gss = null_hash ()
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(* Fresh XObject names. If we are stamping over another page, manage clashes later. *)
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let fresh_xobj_name () = "/Img0"
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let gsnum = ref ~-1
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let fresh_gs_name () =
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gsnum += 1;
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"/gs" ^ string_of_int !gsnum
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let current_url = ref None
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let fontnum = ref 0
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let fonts = null_hash ()
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let current_font = ref (Pdftext.StandardFont (Pdftext.TimesRoman, Pdftext.WinAnsiEncoding))
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let fresh_font_name pdf f =
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fontnum += 1;
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let n = "/F" ^ string_of_int !fontnum in
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Hashtbl.add fonts n (Pdf.Indirect (Pdftext.write_font pdf f));
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n
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let process_specials s = s
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let rec ops_of_drawop pdf = function
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| Push -> [Pdfops.Op_q]
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| Pop -> [Pdfops.Op_Q]
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| Matrix m -> [Pdfops.Op_cm m]
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| Rect (x, y, w, h) -> [Pdfops.Op_re (x, y, w, h)]
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| Bezier (a, b, c, d, e, f) -> [Pdfops.Op_c (a, b, c, d, e, f)]
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| To (x, y) -> [Pdfops.Op_m (x, y)]
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| Line (x, y) -> [Pdfops.Op_l (x, y)]
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| SetFill x ->
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begin match x with
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| RGB (r, g, b) -> [Op_rg (r, g, b)]
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| Grey g -> [Op_g g]
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| CYMK (c, y, m, k) -> [Op_k (c, y, m, k)]
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| NoCol -> []
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end
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| SetStroke x ->
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begin match x with
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| RGB (r, g, b) -> [Op_RG (r, g, b)]
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| Grey g -> [Op_G g]
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| CYMK (c, y, m, k) -> [Op_K (c, y, m, k)]
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| NoCol -> []
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end
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| ClosePath
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| Fill -> [Pdfops.Op_f]
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| FillEvenOdd -> [Pdfops.Op_f']
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| Stroke -> [Pdfops.Op_S]
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| FillStroke -> [Pdfops.Op_B]
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| FillStrokeEvenOdd -> [Pdfops.Op_B']
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| Clip -> [Pdfops.Op_W; Pdfops.Op_n]
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| ClipEvenOdd -> [Pdfops.Op_W']
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| SetLineThickness t -> [Pdfops.Op_w t; Pdfops.Op_n]
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| SetLineCap c -> [Pdfops.Op_J c]
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| SetLineJoin j -> [Pdfops.Op_j j]
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| SetMiterLimit m -> [Pdfops.Op_M m]
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| SetDashPattern (x, y) -> [Pdfops.Op_d (x, y)]
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| SoftXObject l | HardXObject l ->
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[Pdfops.Op_q] @ ops_of_drawops pdf l @ [Pdfops.Op_Q]
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| Image s -> [Pdfops.Op_Do (try fst (Hashtbl.find images s) with _ -> Cpdferror.error ("Image not found: " ^ s))]
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| ImageXObject (s, obj) ->
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Hashtbl.add images s (fresh_xobj_name (), Pdf.addobj pdf obj);
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[]
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| NewPage -> Pdfe.log ("NewPage remaining in graphic stream"); assert false
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| Opacity v ->
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let n = fresh_gs_name () in
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Hashtbl.add gss n (Pdf.Dictionary [("/ca", Pdf.Real v)]);
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[Pdfops.Op_gs n]
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| SOpacity v ->
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let n = fresh_gs_name () in
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Hashtbl.add gss n (Pdf.Dictionary [("/CA", Pdf.Real v)]);
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[Pdfops.Op_gs n]
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| URL s ->
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current_url := Some s;
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[]
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| EndURL ->
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current_url := None;
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[]
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| Font (s, f) ->
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let n = fresh_font_name pdf (Pdftext.StandardFont (s, Pdftext.WinAnsiEncoding)) in
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[Pdfops.Op_Tf (n, f)]
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| BT -> [Pdfops.Op_BT]
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| ET -> [Pdfops.Op_ET]
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| Text s ->
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let charcodes =
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implode (map char_of_int (option_map (Pdftext.charcode_extractor_of_font_real !current_font) (Pdftext.codepoints_of_utf8 (process_specials s))))
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in
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[Pdfops.Op_Tj charcodes]
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| Leading f -> [Pdfops.Op_TL f]
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| CharSpace f -> [Pdfops.Op_Tc f]
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| WordSpace f -> [Pdfops.Op_Tw f]
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| TextScale f -> [Pdfops.Op_Tz f]
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| RenderMode i -> [Pdfops.Op_Tr i]
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| Rise f -> [Pdfops.Op_Ts f]
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| Newline -> [Pdfops.Op_T']
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and ops_of_drawops pdf drawops =
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flatten (map (ops_of_drawop pdf) drawops)
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(* Draw all the accumulated operators. FIXME: Manage name clashes in Xobjects etc. *)
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let draw fast range pdf drawops =
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let s = Pdfops.string_of_ops (ops_of_drawops pdf drawops) in
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let pdf = Cpdftweak.append_page_content s false fast range pdf in
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let images = list_of_hashtbl images in
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let image_resources = map (fun (_, (n, o)) -> (n, Pdf.Indirect o)) images in
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let gss_resources = list_of_hashtbl gss in
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let font_resources = list_of_hashtbl fonts in
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match images, gss_resources, font_resources with [], [], [] -> pdf | _ ->
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let pages = Pdfpage.pages_of_pagetree pdf in
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let pages =
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map
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(fun p ->
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let new_resources =
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let existing_xobjects =
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match Pdf.lookup_direct pdf "/XObject" p.Pdfpage.resources with
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| Some (Pdf.Dictionary d) -> d
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| _ -> []
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in
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let existing_gss =
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match Pdf.lookup_direct pdf "/ExtGState" p.Pdfpage.resources with
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| Some (Pdf.Dictionary d) -> d
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| _ -> []
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in
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let existing_fonts =
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match Pdf.lookup_direct pdf "/Font" p.Pdfpage.resources with
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| Some (Pdf.Dictionary d) -> d
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| _ -> []
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in
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let new_xobjects = fold_right (fun (k, v) d -> add k v d) image_resources existing_xobjects in
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let new_gss = fold_right (fun (k, v) d -> add k v d) gss_resources existing_gss in
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let new_fonts = fold_right (fun (k, v) d -> add k v d) font_resources existing_fonts in
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Pdf.add_dict_entry
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(Pdf.add_dict_entry
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(Pdf.add_dict_entry p.Pdfpage.resources "/XObject" (Pdf.Dictionary new_xobjects))
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"/ExtGState"
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(Pdf.Dictionary new_gss))
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"/Font"
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(Pdf.Dictionary new_fonts)
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in
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{p with resources = new_resources})
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pages
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in
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Pdfpage.change_pages true pdf pages
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