grSoftVersion()
""
if
cairographics is not available.libpng
in use, or ""
if
not available.""
if JPEG support was not compiled in.libtiff
in use, or ""
if
not available.libjpeg-turbo
used on some Linux distributions
reports its version as "6.2"
, the IJG version from which it forked.
extSoftVersion
for versions of non-graphics software.