[Poppler-bugs] [Bug 99167] New: do not create duplicates of the same objects

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99167

            Bug ID: 99167
           Summary: do not create duplicates of the same objects
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: utils
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: tspiteri at ieee.org

Created attachment 128605
  --> https://bugs.freedesktop.org/attachment.cgi?id=128605&action=edit
The pdf document used in the example output.

When I separate a pdf into pages and then unite it again, fonts are duplicated.
The attached document a.pdf uses a regular font in page 1, and in page 2 it
uses the same regular font as well as a bold font. After separating and
uniting, the united file contains two copies of the regular font. It would be
nice if the tools removed the identical duplicated fonts.

Details of an example are included below. Note that in the output to pdffonts,
I removed the following columns which were common to all fonts:

type              encoding         emb sub uni
----------------- ---------------- --- --- ---
Type 1            Custom           yes yes no

File sizes and font information:

$ wc -c a.pdf; pdffonts a.pdf
14244 a.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                 4  0
EBGCWF+NimbusRomNo9L-Medi                10  0

$ pdfseparate a.pdf b%d.pdf

$ wc -c b1.pdf; pdffonts b1.pdf
8404 b1.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                 4  0

$ wc -c b2.pdf; pdffonts b2.pdf
15120 b2.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                 4  0
EBGCWF+NimbusRomNo9L-Medi                10  0

$ pdfunite b1.pdf b2.pdf c.pdf

$ wc -c c.pdf; pdffonts c.pdf
22916 c.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                 4  0
ULOTVD+NimbusRomNo9L-Regu                23  0
EBGCWF+NimbusRomNo9L-Medi                29  0

$ pdfseparate c.pdf d%d.pdf

$ wc -c d1.pdf; pdffonts d1.pdf
8061 d1.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                 4  0

$ wc -c d2.pdf; pdffonts d2.pdf
14778 d2.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                23  0
EBGCWF+NimbusRomNo9L-Medi                29  0

$ pdfunite d1.pdf d2.pdf e.pdf

$ wc -c e.pdf; pdffonts e.pdf
23296 e.pdf
name                                 object ID
------------------------------------ ---------
ULOTVD+NimbusRomNo9L-Regu                 4  0
ULOTVD+NimbusRomNo9L-Regu                42  0
EBGCWF+NimbusRomNo9L-Medi                48  0

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