<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body bgcolor="#ffffff" text="#000000"> <div class="moz-text-flowed" style="font-size: 10px;" lang="x-unicode">Hi, I have a program that outputs to SVG, PDF, PS, or PNG. It is written using cairomm. The same sources build on both Linux and Mac OS X. However, I get slightly different outputs on the two platforms. I have dumped the coordinates I am giving to move_to and line_to, and these are identical on the two platforms (to six significant digits, at least, the default precision for std::cout). Also, both platforms are using Intel CPUs. However, the cairo output is not identical. It's easiest to compare the SVG outputs, using diff/meld, but the PS output exhibits the same differences. Also the PNG outputs are slightly different: I used ImageMagick to subtract one image from the other and viewed the resulting image which was all black except for a couple of noticeable lines in the same places that I am seeing differences in the SVG/PS output. The SVG/PS differences are localized to an endpoint of just one line segment in the middle of two longer paths. Everything else is the same, down to the last digit. However, although these differences are not visually noticeable (they are in the 4th decimal place) they are causing me a problem with my regression tests. I have checked sample output into my source repo from Linux, but when I am developing on Mac I get different output so I can't check for regressions without manually inspecting the output. Am I correct in thinking that I should get identical output on the different platforms? If not, why would almost all the output be the same except for just a few places? I noticed that the coordinates I dumped from my code and the coordinates in the SVG are the same up to the 3rd or 4th digit, but are completely different thereafter. The package version of cairo on my Linux system (Ubuntu Jaunty alpha) is 1.8.6-1ubuntu2. On Mac I am using MacPorts and the version is "1.8.6, Revision 4". I can send sample output and code if desired. Thanks for any help offered. --Neil </div> </body> </html>