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Plumbing for -proces-images -dpi-threshold
This commit is contained in:
John Whitington
parent
3a39b5497a
commit
ecbccd4567
@ -4321,13 +4321,13 @@ let go () =
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if args.format_json then
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flprint
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(Cpdfyojson.Safe.pretty_to_string
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(`List (map (fun (pagenum, xobject, w, h, wdpi, hdpi) ->
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`Assoc [("Page", `Int pagenum); ("XObject", `String xobject); ("W", `Int w); ("H", `Int h); ("Xdpi", `Float wdpi); ("Ydpi", `Float hdpi)]) images)))
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(`List (map (fun (pagenum, xobject, w, h, wdpi, hdpi, objnum) ->
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`Assoc [("Object", `Int objnum); ("Page", `Int pagenum); ("XObject", `String xobject); ("W", `Int w); ("H", `Int h); ("Xdpi", `Float wdpi); ("Ydpi", `Float hdpi)]) images)))
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else
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iter
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(function (pagenum, xobject, w, h, wdpi, hdpi) ->
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(function (pagenum, xobject, w, h, wdpi, hdpi, objnum) ->
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if wdpi < f || hdpi < f then
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Printf.printf "%i, %s, %i, %i, %f, %f\n" pagenum xobject w h wdpi hdpi)
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Printf.printf "%i, %s, %i, %i, %f, %f, %i\n" pagenum xobject w h wdpi hdpi objnum)
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images
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| Some ListImages ->
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let pdf = get_single_pdf args.op true in
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23
cpdfimage.ml
23
cpdfimage.ml
@ -187,11 +187,7 @@ type xobj =
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let image_results = ref []
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let add_image_result i =
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image_results := i::!image_results
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(* Given a page and a list of (pagenum, name, thing) *)
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let rec image_resolution_page pdf page pagenum dpi (images : (int * string * xobj) list) =
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let rec image_resolution_page pdf page pagenum dpi images =
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try
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let pageops = Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content
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and transform = ref [ref Pdftransform.i_matrix] in
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@ -215,11 +211,11 @@ let rec image_resolution_page pdf page pagenum dpi (images : (int * string * xob
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(*i Printf.printf "o = %f, %f, x = %f, %f, y = %f, %f\n" (fst o) (snd o) (fst x) (snd x) (fst y) (snd y); i*)
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let rec lookup_image k = function
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| [] -> assert false
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| (_, a, _) as h::_ when a = k -> h
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| (_, a, _, _) as h::_ when a = k -> h
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| _::t -> lookup_image k t
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in
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begin match lookup_image xobject images with
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| (pagenum, name, Form (xobj_matrix, content, resources)) ->
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| (pagenum, name, Form (xobj_matrix, content, resources), objnum) ->
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let content =
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(* Add in matrix etc. *)
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let total_matrix = Pdftransform.matrix_compose xobj_matrix !(hd !transform) in
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@ -238,12 +234,12 @@ let rec image_resolution_page pdf page pagenum dpi (images : (int * string * xob
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in
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let newpdf = Pdfpage.change_pages false pdf [page] in
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image_resolution newpdf [pagenum] dpi
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| (pagenum, name, Image (w, h)) ->
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| (pagenum, name, Image (w, h), objnum) ->
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let lx = Pdfunits.points (distance_between o x) Pdfunits.Inch in
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let ly = Pdfunits.points (distance_between o y) Pdfunits.Inch in
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let wdpi = float w /. lx
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and hdpi = float h /. ly in
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add_image_result (pagenum, xobject, w, h, wdpi, hdpi)
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image_results := (pagenum, xobject, w, h, wdpi, hdpi, objnum)::!image_results
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(*Printf.printf "%i, %s, %i, %i, %f, %f\n" pagenum xobject w h wdpi hdpi*)
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(*i else
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Printf.printf "S %i, %s, %i, %i, %f, %f\n" pagenum xobject (int_of_float w) (int_of_float h) wdpi hdpi i*)
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@ -275,6 +271,7 @@ and image_resolution pdf range dpi =
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| Some (Pdf.Dictionary xobjects) ->
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iter
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(function (name, xobject) ->
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let objnum = match xobject with Pdf.Indirect i -> i | _ -> 0 in
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match Pdf.lookup_direct pdf "/Subtype" xobject with
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| Some (Pdf.Name "/Image") ->
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let width =
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@ -286,7 +283,7 @@ and image_resolution pdf range dpi =
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| Some x -> Pdf.getnum pdf x
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| None -> 1.
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in
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images := (pagenum, name, Image (int_of_float width, int_of_float height))::!images
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images := (pagenum, name, Image (int_of_float width, int_of_float height), objnum)::!images
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| Some (Pdf.Name "/Form") ->
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let resources =
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match Pdf.lookup_direct pdf "/Resources" xobject with
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@ -301,7 +298,7 @@ and image_resolution pdf range dpi =
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Pdftransform.d = Pdf.getnum pdf d; Pdftransform.e = Pdf.getnum pdf e; Pdftransform.f = Pdf.getnum pdf f}
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| _ -> Pdftransform.i_matrix
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in
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images := (pagenum, name, Form (matrix, contents, resources))::!images
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images := (pagenum, name, Form (matrix, contents, resources), objnum)::!images
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| _ -> ()
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)
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xobjects
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@ -311,8 +308,8 @@ and image_resolution pdf range dpi =
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(* Now, split into differing pages, and call [image_resolution_page] on each one *)
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let pagesplits =
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map
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(function (a, _, _)::_ as ls -> (a, ls) | _ -> assert false)
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(collate (fun (a, _, _) (b, _, _) -> compare a b) (rev !images))
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(function (a, _, _, _)::_ as ls -> (a, ls) | _ -> assert false)
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(collate (fun (a, _, _, _) (b, _, _, _) -> compare a b) (rev !images))
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and pages =
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Pdfpage.pages_of_pagetree pdf
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in
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@ -9,7 +9,7 @@ val extract_images :
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Cpdfmetadata.encoding -> bool -> bool -> Pdf.t -> int list -> string -> unit
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(** Report image resolutions. *)
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val image_resolution : Pdf.t -> int list -> float -> (int * string * int * int * float * float) list
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val image_resolution : Pdf.t -> int list -> float -> (int * string * int * int * float * float * int) list
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(** List images in JSON format *)
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val images : Pdf.t -> int list -> Cpdfyojson.Safe.t
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