Re: [Xml-sg-cmt] WeasyPrint Update

[Robert Sparks <[e-mail]>]

(fwiw, I started with the visual differencer at diff-checker.com, which 
provides an overlay and a slider between original/changed. Here's an 
example where it gets really different (because of table/figure 
rendering I think) at the bottom of page 16 of RFC8779, at least with 
what we have so far:

slider view:
On 6/29/22 8:48 AM, Robert Sparks wrote:
> I'm not sure we can do a real comparison without running these through 
> the pdfaPilot step, which essentially rewrites the pdf.
>
> Alice - is it easy to script running all the things at [3] through 
> pdfaPilot? If not, could you run 8779 through (as that's the 
> semi-random one I chose to look at first).
>
> I'm already seeing the differences in figure/table layout that can 
> affect where pagebreaks lie.
>
> Most of the other differences I see are in indentation, spacing 
> between paragraphs, etc - makes me wonder if the css is being honored 
> as intended. These add up over pages to change the overall length of 
> the document in pages (though the pagebreak algorithm change makes 
> that unavoidable). Again, I'm curious to see if these go away when run 
> through pdfaPilot.
>
>
> On 6/28/22 8:28 PM, Kesara Rathnayake wrote:
>> Hi all,
>>
>> I have draft PR [1] for the WeasyPrint update.
>> This updates WeasyPrint from 52.5 to 55.0.
>> Since WeasyPrint 53.0, they have moved the PDF generation from cairo 
>> to pypdf [2].
>> I have generated PDFs from RFC 8650 to RFC 9260 [3].
>>
>> There are some differences from my random checks.
>>
>> Let me know your thoughts.
>>
>> Note that these PDFs haven't gone through the pdfaPilot step to 
>> convert to PDF/A-3 with the XML source file embedded.
>>
>> [1] https://github.com/ietf-tools/xml2rfc/pull/802
>> [2] https://github.com/CourtBouillon/pydyf
>> [3] https://devbox.amsl.com/weasyprint55/
>>
>> Cheers,
>> Kesara