fenix/cpdf-source
1
0
Fork 0
mirror of https://github.com/johnwhitington/cpdf-source.git synced 2025-06-05 22:09:39 +02:00
Code Issues Packages Projects Releases Wiki Activity

Debug all CCITT by eliding checks

Browse Source
This commit is contained in:
John Whitington
2025-01-11 10:24:39 +08:00
parent cd55d11966
commit 34bf294fac
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
cpdfimage.ml
View File

@ -828,9 +828,9 @@ let recompress_1bpp_ccitt_lossless ~pixel_threshold ~length_threshold pdf s dict
let restore () = reference := old in let restore () = reference := old in
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else (* (but also, jbig2enc fails on tiny images) *) (*if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else*)
let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else (*if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else*)
begin begin
Pdfcodec.decode_pdfstream_until_unknown pdf s; Pdfcodec.decode_pdfstream_until_unknown pdf s;
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with match Pdf.lookup_direct pdf "/Filter" (fst !reference) with
@ -841,7 +841,7 @@ let recompress_1bpp_ccitt_lossless ~pixel_threshold ~length_threshold pdf s dict
let data = match s with Pdf.Stream {contents = _, Pdf.Got d} -> d | _ -> assert false in let data = match s with Pdf.Stream {contents = _, Pdf.Got d} -> d | _ -> assert false in
let compressed = Pdfcodec.encode_ccitt w data in let compressed = Pdfcodec.encode_ccitt w data in
let newsize = bytes_size compressed in let newsize = bytes_size compressed in
if newsize < size then if true (*newsize < size*) then
begin begin
if !debug_image_processing then Printf.printf "1bpp to CCITT %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.)); if !debug_image_processing then Printf.printf "1bpp to CCITT %i -> %i (%i%%)\n%!" size newsize (int_of_float (float newsize /. float size *. 100.));
reference := reference :=
@ -861,7 +861,7 @@ let recompress_1bpp_ccittg4_lossless ~pixel_threshold ~length_threshold pdf s di
let restore () = reference := old in let restore () = reference := old in
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else (* (but also, jbig2enc fails on tiny images) *) if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else
let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in let size = match Pdf.lookup_direct pdf "/Length" dict with Some (Pdf.Integer i) -> i | _ -> 0 in
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!") else
begin begin