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cpdf-source
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This commit is contained in:
John Whitington 2022-10-06 16:53:13 +01:00
parent 09d0d0d05c
commit af2d74a86b
1 changed files with 19 additions and 5 deletions
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24
cpdftruetype.ml
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@ -2,7 +2,7 @@
open Pdfutil open Pdfutil
open Pdfio open Pdfio
(* ./cpdf -font-ttf ~/repos/pdfs/fonts/NotoSans-Bold.ttf -add-text foo hello.pdf -o out.pdf *) (* ./cpdf -font-ttf ~/repos/pdfs/fonts/NimbusRoman-Regular.ttf -add-text foo hello.pdf -o out.pdf *)
type t = type t =
{flags : int; {flags : int;
@ -24,7 +24,7 @@ type t =
subset : Pdfio.bytes; subset : Pdfio.bytes;
tounicode : Pdfio.bytes option} tounicode : Pdfio.bytes option}
let dbg = ref false (* text-based debug *) let dbg = ref true (* text-based debug *)
let tounicode_preamble = let tounicode_preamble =
"/CIDInit /ProcSet findresource begin\n\ "/CIDInit /ProcSet findresource begin\n\
@ -221,12 +221,17 @@ let write_glyf_table subset cmap bs mk_b glyfoffset loca =
if !dbg then (Printf.printf "We want glyfs for locations: "; iter (Printf.printf "%i ") locnums; Printf.printf "\n"); if !dbg then (Printf.printf "We want glyfs for locations: "; iter (Printf.printf "%i ") locnums; Printf.printf "\n");
let byteranges = map (fun x -> (loca.(x), loca.(x + 1))) locnums in let byteranges = map (fun x -> (loca.(x), loca.(x + 1))) locnums in
if !dbg then (Printf.printf "Byte ranges: "; iter (fun (a, b) -> Printf.printf "(%li, %li) " a b) byteranges; Printf.printf "\n"); if !dbg then (Printf.printf "Byte ranges: "; iter (fun (a, b) -> Printf.printf "(%li, %li) " a b) byteranges; Printf.printf "\n");
let len = List.fold_left i32add 0l (map (fun (a, b) -> i32sub b a) byteranges) in
Printf.printf "THE LENGTH is %li\n" len;
let write_bytes bs a l = let write_bytes bs a l =
if !dbg then Printf.printf "glyf: write_bytes %li %li\n" a l; if !dbg then Printf.printf "glyf: write_bytes %li %li\n" a l;
let b = mk_b (i32toi (i32add glyfoffset a)) in let b = mk_b (i32toi (i32add glyfoffset a)) in
for x = 1 to i32toi l do putval bs 8 (getval_32 b 8) done for x = 1 to i32toi l do putval bs 8 (getval_32 b 8) done
in in
iter (fun (a, b) -> write_bytes bs a (i32sub b a)) byteranges iter (fun (a, b) -> write_bytes bs a (i32sub b a)) byteranges;
let padding = 4 - i32toi len mod 4 in
Printf.printf "padding = %i bytes\n" padding;
for x = 1 to padding do putval bs 8 0l done
let read_os2_table unitsPerEm b blength = let read_os2_table unitsPerEm b blength =
let version = read_ushort b in let version = read_ushort b in
@ -319,6 +324,7 @@ let remove_unneeded_tables major minor tables indexToLocFormat subset encoding c
tables; tables;
(* Reduce offsets by the reduction in header table size *) (* Reduce offsets by the reduction in header table size *)
let header_size_reduction = i32ofi (16 * (Array.length tables - length !tablesout)) in let header_size_reduction = i32ofi (16 * (Array.length tables - length !tablesout)) in
let glyf_table_size_reduction = ref 0l in
let newtables = let newtables =
Array.of_list Array.of_list
(map (map
@ -327,12 +333,20 @@ let remove_unneeded_tables major minor tables indexToLocFormat subset encoding c
if string_of_tag tag = "glyf" && subset <> [] then if string_of_tag tag = "glyf" && subset <> [] then
let bs = make_write_bitstream () in let bs = make_write_bitstream () in
write_glyf_table subset cmap bs mk_b glyfoffset loca; write_glyf_table subset cmap bs mk_b glyfoffset loca;
i32ofi (bytes_size (bytes_of_write_bitstream bs)) let newlen = i32ofi (bytes_size (bytes_of_write_bitstream bs)) in
glyf_table_size_reduction := i32sub ttlength newlen;
newlen
else ttlength else ttlength
in in
(tag, checksum, i32sub offset header_size_reduction, ttlength)) let offset' =
i32sub
(i32sub offset header_size_reduction)
(if string_of_tag tag = "glyf" then 0l else !glyf_table_size_reduction)
in
(tag, checksum, offset', ttlength))
(rev !tablesout)) (rev !tablesout))
in in
Printf.printf "glyf_table_size_reduction = %li\n" !glyf_table_size_reduction;
if !dbg then Printf.printf "***Reduced:\n"; if !dbg then Printf.printf "***Reduced:\n";
Array.iter Array.iter
(fun (tag, checkSum, offset, ttlength) -> (fun (tag, checkSum, offset, ttlength) ->