Re: [Rd] png cairo device problems on Mac 10.6.8

From: Steven McKinney <smckinney_at_bccrc.ca>
Date: Wed, 18 Jan 2012 15:33:50 -0800

> -----Original Message-----
> From: Simon Urbanek [mailto:simon.urbanek_at_r-project.org]
> Sent: January-18-12 3:10 PM
> To: Steven McKinney
> Cc: R-devel_at_r-project.org
> Subject: Re: [Rd] png cairo device problems on Mac 10.6.8
>
>
> On Jan 18, 2012, at 5:22 PM, Steven McKinney wrote:
>
> >
> > Hi all,
> >
> > I have been having problems generating png files on a Mac running OS X
> 10.6.8.
> >
> > Here's a simple example
> >
> >> png("foo.png", type = "cairo"); plot(1:10); dev.off();
> > null device
> > 1
> > libpng warning: Application built with libpng-1.2.26 but running with
> 1.5.2
> >
> > The resultant file is of size 0 Kb.
> >
> > Is this the proper place to report this issue? Or should this
> > be reported to r-sig-mac?
> >
>
> yes
>
>
> > If I run
> >
> >> png("foo.png"); plot(1:10); dev.off();
> > null device
> > 1
> >
> > I get a 16 Kb file with the appropriate plot. (Odd, since the default
> type is "cairo".)
> >
>
> No, the default is "quartz" unless you change it in your options.

D'oh! I should have verified by reading the source. Apologies for the misinformation. The fact that "cairo" appears first in the type argument list does not make it the default.

>
> On a similar note type="cairo-png" works as well.

Yes, type="cairo-png" yields a successful file.

The png() function shows a call of

   invisible(.External(devCairo, filename, 2L, g$width, ...

for type="cairo" and a call of

   invisible(.External(devCairo, filename, 5L, g$width, ...

with type="cairo-png" so the third argument (2 or 5) appears to be the only difference. I have not dug into the devCairo code to see how that arg is handled.

>
> The problem seems to be with R's configuration - for some mysterious reason
> it picks libpng12 flags even though cairo clearly includes libpng15 (and so
> does pkg-config). I'll need to dig a bit into that.

Thank you very much.

Cheers

Steve

>
> Cheers,
> Simon
>
>
> > Whenever I see the libpng warning, I end up with a 0 Kb file.
> >
> > Details of R session below.
> >
> >
> > Regards
> >
> > Steve McKinney
> >
> >
> >
> > R version 2.14.1 Patched (2012-01-11 r58090)
> > Copyright (C) 2012 The R Foundation for Statistical Computing
> > ISBN 3-900051-07-0
> > Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
> >
> > R is free software and comes with ABSOLUTELY NO WARRANTY.
> > You are welcome to redistribute it under certain conditions.
> > Type 'license()' or 'licence()' for distribution details.
> >
> > Natural language support but running in an English locale
> >
> > R is a collaborative project with many contributors.
> > Type 'contributors()' for more information and
> > 'citation()' on how to cite R or R packages in publications.
> >
> > Type 'demo()' for some demos, 'help()' for on-line help, or
> > 'help.start()' for an HTML browser interface to help.
> > Type 'q()' to quit R.
> >
> > [R.app GUI 1.44 (5997) x86_64-apple-darwin9.8.0]
> >
> > [History restored from /Users/stevenmckinney/.Rhistory]
> >
> >> png("foo.png"); plot(1:10); dev.off();
> > null device
> > 1
> >> png("foo.png", type = "cairo"); plot(1:10); dev.off();
> > null device
> > 1
> > libpng warning: Application built with libpng-1.2.26 but running with
> 1.5.2
> >> ?png
> > starting httpd help server ... done
> >> capabilities()
> > jpeg png tiff tcltk X11 aqua http/ftp sockets
> libxml fifo
> > TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
> TRUE TRUE
> > cledit iconv NLS profmem cairo
> > TRUE TRUE TRUE TRUE TRUE
> >> png("foo.png"); plot(1:10); dev.off();
> > null device
> > 1
> >> sessionInfo()
> > R version 2.14.1 Patched (2012-01-11 r58090)
> > Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
> >
> > locale:
> > [1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8
> >
> > attached base packages:
> > [1] stats graphics grDevices utils datasets methods base
> >
> > loaded via a namespace (and not attached):
> > [1] tools_2.14.1
> >>
> >
> >
> > Steven McKinney, Ph.D.
> >
> > Statistician
> > Molecular Oncology and Breast Cancer Program
> > British Columbia Cancer Research Centre
> >
> > email: smckinney +at+ bccrc +dot+ ca
> >
> > tel: 604-675-8000 x7561
> >
> > BCCRC
> > Molecular Oncology
> > 675 West 10th Ave, Floor 4
> > Vancouver B.C.
> > V5Z 1L3
> > Canada
> >
> > ______________________________________________
> > R-devel_at_r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
> >



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