[Poppler-bugs] [Bug 22855] New: Very bad quality from evince printing pages which have been printed to pdf using firefox

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=22855

           Summary: Very bad quality from evince printing pages which have
                    been printed to pdf using firefox
           Product: poppler
           Version: unspecified
          Platform: Other
               URL: https://bugs.edge.launchpad.net/ubuntu/+source/poppler/+
                    bug/394266
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: cairo backend
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: pvillavi at gmail.com


this report has been filed here:

https://bugs.edge.launchpad.net/ubuntu/+source/poppler/+bug/394266

"
Using karmic and firefox-3.0, I printed a pdf of the following web page:

http://en.wikipedia.org/wiki/Subgroup

(permanent link:
http://en.wikipedia.org/w/index.php?title=Subgroup&oldid=296077109)

If I print this pdf with evince (even printing to a pdf file) I get terrible
quality and pages are converted to images. If I print it with okular, I get a
good quality document, however a mathematical formula is obscured (bottom of
page 3). In evince the formula is visible.

Here is the pdf printed from firefox:

http://launchpadlibrarian.net/28547865/groups.pdf

The reprint from evince:

http://launchpadlibrarian.net/28547874/a.pdf

The reprint from Okular:

http://launchpadlibrarian.net/28547885/b.pdf

On this other bug report:
https://bugs.edge.launchpad.net/ubuntu/+source/cupsys/+bug/150187 Adrian
Johnson explained:

The reason pages 1 and 4 of your PDF are printed as a bitmap are:

- Firefox is using cairo operators that are not natively supported by PDF on
page 1 and 4. I don't think there is any reason that Firefox needs to use
anything other than CAIRO_OPERATOR_OVER when printing so I consider this a bug
in Firefox.

- As a result cairo embeds a fallback image in the PDF for the region drawn
with operators not supported by PDF. But the bounding box of the PDF pattern
used to draw the fallback image is set to the page size instead of the image
size. This is a bug in cairo.

- When poppler is used to print the PDF via the cairo backend the image becomes
a full page image due to the pattern bounding box being set to the page size."

It's also reproducible with git master version of poppler.

Thanks,


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