[cairo] X11 v. XQuartz

[Jennifer Adams]

Dear Experts,
I am a developer of GrADS, a visualization tool for meteorological data. GrADS uses X11 for its interactive display window, but it also has a batch mode, so you can create graphics without the use of X. We have developed an interface for Cairo to do the rendering, not only to the X window, but also to create png, ps, eps, pdf, and svg output. 

The problem I am having is with the X rendering when using XQuartz. Everything looks right when I use the old (deprecated) X11 application on my Mac, but if I use XQuartz, I get an incomplete rendering, illustrated by two screen shots (links are given below.) The graphical elements are very basic, these plots contain nothing but line segments and filled rectangles. 

http://iges.org/jma/x11.png
http://iges.org/jma/xquartz.png

The batch-mode renderings by Cairo are correct, and the non-Cairo version of GrADS does not exhibit the problem with the X window display, so I am pretty sure that Cairo and XQuartz are not playing well together. 

I am running Mac OS X 10.7.5. When running the old X11 application, the version information in the "About X11" window says: XQuartz 2.6.5 (xorg-server 1.10.6). When running XQuartz, the version numbers are more recent: XQuartz 2.7.4 (xorg-server 1.13.0). The Cairo version is 1.12.8.

I searched through my 2-yr archive of forum emails and found nothing related to rendering problems with XQuartz. Any suggestions or ideas about what might be going wrong would be most welcome. 

--Jennifer


--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 





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