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Support saving JPEG comments #6774

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merged 12 commits into from Dec 7, 2022
Merged

Support saving JPEG comments #6774

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d822d85
support round-tripping JPEG comments
smason Dec 2, 2022
e9f4858
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Dec 2, 2022
976ad57
Save comments from any image format by default
radarhere Dec 2, 2022
c1d0a00
Use _binary instead of struct
radarhere Dec 2, 2022
525c011
Test that comment is reread
radarhere Dec 2, 2022
e71f7c1
Merge pull request #1 from radarhere/write-jpeg-com
smason Dec 3, 2022
1ed1a3a
make sure passing a blank comment removes existing comment
smason Dec 3, 2022
e50ae85
Use jpeg_write_marker to write comment
radarhere Dec 5, 2022
399975f
Merge pull request #2 from radarhere/write-jpeg-com
smason Dec 5, 2022
eddc9bd
switch to #z for comment parameter
smason Dec 5, 2022
1d78008
Free comment when returning early
radarhere Dec 6, 2022
6ca08a4
Merge pull request #3 from radarhere/write-jpeg-com
smason Dec 6, 2022
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4 changes: 1 addition & 3 deletions src/PIL/JpegImagePlugin.py
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Expand Up @@ -736,9 +736,7 @@ def validate_qtables(qtables):
)
i += 1

comment = info.get("comment", im.info.get("comment")) or b""
if isinstance(comment, str):
comment = comment.encode()
comment = info.get("comment", im.info.get("comment"))

# "progressive" is the official name, but older documentation
# says "progression"
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2 changes: 1 addition & 1 deletion src/encode.c
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Expand Up @@ -1057,7 +1057,7 @@ PyImaging_JpegEncoderNew(PyObject *self, PyObject *args) {

if (!PyArg_ParseTuple(
args,
"ss|nnnnnnnnOy#y#y#",
"ss|nnnnnnnnOz#y#y#",
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&mode,
&rawmode,
&quality,
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2 changes: 1 addition & 1 deletion src/libImaging/JpegEncode.c
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Expand Up @@ -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

jpeg_write_marker(&context->cinfo, JPEG_COM, (unsigned char *)context->comment, context->comment_size);
}
state->state++;
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