PDF export does not subset fonts

[Guillaume Millet]

fonts in PDF exported from Inkscape are not subsetted.
Configuration :
- Kubuntu 8.10 with proposed and backports repositories;
- inkscape 0.46+devel, built Feb 2 2009;
- libcairo.so.2.10800.0 in libcairo2_1.8.0-0ubuntu1_i386.deb.

Update 18-06-2009: still not subsetted on Kubuntu 9.04, Inskape pre-0.47 (PPA), libcairo 1.8.6-1ubuntu2.

[bbyak (buliabyak)]

we need an example file demonstrating this, and your cairo version

[Guillaume Millet (guimillet)]

$ pdffonts example.pdf
name type emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
FreeSerif CID TrueType yes no yes 5 0
NimbusRomanNo9L Type 1 yes no yes 6 0

[bbyak (buliabyak)]

thanks - if you attach the source svg as well it would help

[jazzynico (jazzynico)]

Confirmed on Ubuntu 9.04, Inkscape rev. 22025.

[Guillaume Millet (guimillet)]

Still present in Inkscape rev. 22583 on Ubuntu 10.04 Beta.

[Guillaume Millet (guimillet)]

New behavior in Inkscape 0.48.0 r9654 on Kubuntu 10.10, with libcairo2 version 1.10.0-1ubuntu2.

$ pdffonts example_0.48.pdf
name type emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
TFEOFM+FreeSerif CID TrueType yes yes yes 5 0
KDHGYS+NimbusRomanNo9L Type 1 yes yes yes 6 0

But the pdf produced is about the same, even bigger (49.3 KiB instead of 49.1 KiB before).
After passing it in gs, it becomes much smaller (7.2 KiB). The command I used:
gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=example_after_gs.pdf -f example_0.48.pdf

[Adrian Johnson (ajohnson-redneon)]

Cairo PDF has always subsetted fonts. However older versions of cairo did not prepend the subset tag (the six random letters) to the font name. pdffonts looks for the 6 random letters followed by a '+' sign to identify subsetting. So before cairo 1.10, pdffonts incorrectly reported that fonts were not subsetted.

The very large reduction in file size after passing through gs is because the Type 1 font was converted to a CFF font.

[Guillaume Millet (guimillet)]

Thanks for the clear explanation!