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Support saving JPEG comments #6774

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merged 12 commits into from
Dec 7, 2022
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@smason smason commented Dec 2, 2022

Fixes #6773

Changes proposed in this pull request:

  • a JPEG COM segment can now be written during Image.save
  • opening a JPEG file and saving to another file will now copy any existing comment across
  • user can now do image.save(filename, format='JPEG', comment='comment to be written') and the comment will be written to a COM segment

@radarhere radarhere changed the title support round-tripping JPEG comments Support round-tripping JPEG comments Dec 2, 2022
@radarhere radarhere added the JPEG label Dec 2, 2022
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smason commented Dec 3, 2022

not sure what's going on with that MSYS2 MinGW 32-bit test failure, but it looks unrelated

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There are some intermittent failures in our CIs. I've rerun the job, and it has passed now.

@radarhere radarhere changed the title Support round-tripping JPEG comments Support saving JPEG comments Dec 4, 2022
Use jpeg_write_marker to write comment
* means `comment=None` can be passed directly
* no need to conditionally run `str.encode()`
* clean up checking of whether a comment is passed
src/encode.c Show resolved Hide resolved
@@ -278,7 +278,7 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {

case 4:

if (context->comment_size > 0) {
if (context->comment) {
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the rest of the code is conditional on comment != NULL rather than comment_size > 0

they should be the same, but keeping things consistent feels nicer to me

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When you say "the rest of the code", what are you referring to?

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sorry, that wasn't explained well

PyImaging_JpegEncoderNew seems to imply that comment_size is only valid when comment is non-NULL. e.g. comment is initialised to NULL, but comment_size isn't initialised to zero, and later in function (line 1109) it only sets comment = NULL

Free comment when returning early
@radarhere radarhere merged commit 378adeb into python-pillow:main Dec 7, 2022
mergify bot added a commit that referenced this pull request Dec 7, 2022
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smason commented Dec 8, 2022

@radarhere thanks for all the help getting that merged!

sorry for the silence the past couple of days. I've been a bit ill, but recovering now

@smason smason deleted the write-jpeg-com branch December 12, 2022 13:28
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PIL doesn't write JPEG comment
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