png cairo device problems on Mac 10.6.8

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.

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

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.

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)
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ISBN 3-900051-07-0
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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

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png cairo device problems on Mac 10.6.8

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