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Scaffolding for downsampling

This commit is contained in:
John Whitington 2024-11-27 18:27:50 +00:00
parent 483a34af28
commit 9e2681a200
1 changed files with 11 additions and 7 deletions
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18
cpdfcommand.ml
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@ -566,7 +566,8 @@ type args =
mutable rast_res : float;
mutable rast_annots : bool;
mutable rast_antialias : bool;
mutable rast_jpeg_quality : int}
mutable rast_jpeg_quality : int;
mutable rast_downsample : bool}
let args =
{op = None;
@ -712,7 +713,8 @@ let args =
rast_res = 144.;
rast_annots = false;
rast_antialias = true;
rast_jpeg_quality = 75}
rast_jpeg_quality = 75;
rast_downsample = false}
(* Do not reset original_filename or cpdflin or was_encrypted or
was_decrypted_with_owner or recrypt or producer or creator or path_to_* or
@ -844,7 +846,8 @@ let reset_arguments () =
args.rast_res <- 144.;
args.rast_annots <- false;
args.rast_antialias <- true;
args.rast_jpeg_quality <- 75
args.rast_jpeg_quality <- 75;
args.rast_downsample <- false
(* Prefer a) the one given with -cpdflin b) a local cpdflin, c) otherwise assume
installed at a system place *)
@ -3017,6 +3020,7 @@ let specs =
("-rasterize-res", Arg.Float (fun f -> args.rast_res <- f), " Rastierization resolution");
("-rasterize-annots", Arg.Unit (fun () -> args.rast_annots <- true), " Rasterize annotations");
("-rasterize-no-antialias", Arg.Unit (fun () -> args.rast_antialias <- false), " Don't antialias when rasterizing");
("-rasterize-downsample", Arg.Unit (fun () -> args.rast_downsample <- true), " Antialias by downsampling");
("-rasterize-jpeg-quality", Arg.Int (fun i -> args.rast_jpeg_quality <- i), " Set JPEG quality");
("-output-jpeg", Arg.String (fun s -> args.rast_device <- "jpeg"; args.op <- Some (OutputImage s)), " Output pages as JPEGs");
("-output-png", Arg.String (fun s -> args.op <- Some (OutputImage s)), " Output pages as PNGs");
@ -3669,7 +3673,7 @@ let replace_obj pdf objspec obj =
Pdf.replace_chain pdf chain obj
(* Call out to GhostScript to rasterize. Read back in and replace the page contents with the resultant PNG. *)
let rasterize antialias device res annots quality pdf range =
let rasterize antialias downsample device res annots quality pdf range =
Printf.printf "rasterize antialias=%b device=%s res=%f annots=%b\n" antialias device res annots;
if args.path_to_ghostscript = "" then begin
Pdfe.log "Please supply path to gs with -gs\n";
@ -3743,7 +3747,7 @@ let rasterize antialias device res annots quality pdf range =
Sys.remove tmppdf;
pdf
let write_images device res quality boxname annots antialias spec pdf range =
let write_images device res quality boxname annots antialias downsample spec pdf range =
if args.path_to_ghostscript = "" then begin
Pdfe.log "Please supply path to gs with -gs\n";
exit 2
@ -4879,11 +4883,11 @@ let go () =
| Some Rasterize ->
let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in
write_pdf false (rasterize args.rast_antialias args.rast_device args.rast_res args.rast_annots args.rast_jpeg_quality pdf range)
write_pdf false (rasterize args.rast_antialias args.rast_downsample args.rast_device args.rast_res args.rast_annots args.rast_jpeg_quality pdf range)
| Some (OutputImage spec) ->
let pdf = get_single_pdf args.op false in
let range = parse_pagespec_allow_empty pdf (get_pagespec ()) in
write_images args.rast_device args.rast_res args.rast_jpeg_quality args.tobox args.rast_annots args.rast_antialias spec pdf range
write_images args.rast_device args.rast_res args.rast_jpeg_quality args.tobox args.rast_annots args.rast_antialias args.rast_downsample spec pdf range
(* Advise the user if a combination of command line flags makes little sense,
or error out if it make no sense at all. *)