This question was asked previously here, but not resolved:
http://tolstoy.newcastle.edu.au/R/e15/devel/11/08/0307.html
The upshot is that cairo is not being used as the default when it is
available, even though the documentation says:
Default "cairo" where available and reliable, otherwise
"Xlib".
Here is my system information:
% uname -a
Linux anvil 2.6.18-194.11.4.el5 #1 SMP Fri Sep 17 04:57:05 EDT 2010
x86_64 x86_64 x86_64 GNU/Linux
> R.version
_
platform x86_64-unknown-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 3
minor 0.0
year 2013
month 04
day 03
svn rev 62481
language R
version.string R version 3.0.0 (2013-04-03)
nickname Masked Marvel
>
capabilities("X11");capabilities("cairo");options("bitmapType")
X11
TRUE
cairo
TRUE
$bitmapType
[1] "Xlib"
It is clear whether cairo or X11 is being used because cairo does
antialiasing, and X11 does not:
plot(read.table("in.txt"));
Whether cairo is the default is decided in
src/library/grDevices/R/zzz.R in the onLoad function:
list(bitmapType = if(capabilities("aqua")) "quartz"
else if(.Call(C_cairoProps, 2L)) "cairo" else "Xlib")
and
if (.Platform$OS.type != "windows" && !.Call(C_cairoProps,
2L))
X11.options(type = "Xlib")
cairoProps is in src/library/grDevices/src/init.c:
static SEXP cairoProps(SEXP in)
{
int which = asInteger(in);
if(which == 1)
return ScalarLogical(
#ifdef HAVE_WORKING_CAIRO
1
#else
0
#endif
);
else if(which == 2)
return ScalarLogical(
#ifdef HAVE_PANGOCAIRO
1
#else
0
#endif
);
return R_NilValue;
}
I believe this is where the problem comes in. I don't have pangocairo
and cairoProps is being called with 2L instead of 1L. Indeed, if I
change it to 1L and recompile, cairo becomes the default, and
everything runs as expected.
I would like cairo to be checked for rather than pangocairo, but
perhaps there is a good reason how it is being done now. Can this be
changed?
thanks,
michael
--
michael.bell at acm.org
