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Speed up dumping of PNM files

This commit is contained in:
John Whitington 2023-12-29 17:46:54 +00:00
parent 0857e8ab0c
commit 5480a08e77
1 changed files with 6 additions and 22 deletions
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@ -20,26 +20,14 @@ let pnm_to_channel_24 ch w h s =
pnm_header ch w h;
pnm_output_string ch "255";
pnm_newline ch;
let pos = ref 0 in
for y = 1 to h do
for x = 1 to w * 3 do
output_byte ch (bget s !pos);
incr pos
done
done
bytes_to_output_channel ch s
let pnm_to_channel_8 ch w h s =
pnm_output_string ch "P5";
pnm_header ch w h;
pnm_output_string ch "255";
pnm_newline ch;
let pos = ref 0 in
for y = 1 to h do
for x = 1 to w do
output_byte ch (bget s !pos);
incr pos
done
done
bytes_to_output_channel ch s
let pnm_to_channel_1_inverted ch w h s =
pnm_output_string ch "P4";
@ -47,16 +35,12 @@ let pnm_to_channel_1_inverted ch w h s =
pnm_newline ch;
let inverted = Pdfio.copybytes s in
Pdfio.bytes_selfmap lnot inverted;
pnm_output_string ch (Pdfio.string_of_bytes inverted)
bytes_to_output_channel ch inverted
let cmyk_to_channel_32 ch w h s =
let pos = ref 0 in
for y = 1 to h do
for x = 1 to w * 4 do
output_byte ch (255 - bget s !pos);
incr pos
done
done
let inverted = Pdfio.copybytes s in
Pdfio.bytes_selfmap (fun x -> 255 - x) inverted;
bytes_to_output_channel ch inverted
let jbig2_serial = ref 0