Hazen Babcock wrote: > Hazen Babcock wrote: >> Alan W. Irwin wrote: >>> On 2009-03-26 14:06-0400 Hazen Babcock wrote: >>> >>>> Alan W. Irwin wrote: >>>>> Hi Hazen: >>>>> >>>>> I have been testing the efficiency of text clipping for the cairo devices >>>>> for a reasonably modern libcairo (version 1.6.4) and relatively modest >>>>> 2.4GHz PC, and unlike older libcairo versions it is looking good. >>>>> >>>>> Here is one example: >>>>> >>>>> softw...@raven> time c/x09c -dev pngcairo -drvopt text_clipping=0 -fam >>>>> -fflen 2 -o cairotest%n.png >>>>> >>>>> real 0m0.391s >>>>> user 0m0.360s >>>>> sys 0m0.008s >>>>> softw...@raven> time c/x09c -dev pngcairo -drvopt text_clipping=1 -fam >>>>> -fflen 2 -o cairotest%n.png >>>>> >>>>> real 0m0.485s >>>>> user 0m0.468s >>>>> sys 0m0.012s >>>>> >>>>> There is a relatively large amount of text in that example (the contour >>>>> labels), and also quite a bit of graphics. In fact it is that example >>>>> that >>>>> shows (on the first page) what happens if you don't have text clipped >>>>> properly. But the total difference in elapsed time is trivial, just 0.094 >>>>> seconds. >>>> Sounds okay to me. I'm a little worried that many people will have older >>>> versions of the library, but perhaps we can have, or at least recommend a >>>> minimum libcairo version during the build process? >>> Done. See the updated (revision 9775) README.release. >> I was thinking about putting the warning into the cairo.cmake. Is that >> possible? Any pointers on where to look for an example of how to do this? > > Thank you Alan for your help with this. > > I've added a version check in cairo.cmake. You'll get a warning if your > version is less than 1.20.5. To do this I added a version argument to > the pkg_check_pkgconfig macro and propagated this change to the other > driver cmake files. I don't think I broke anything... > > I have a slightly more recent version of pangocairo (1.22.2) and I also > get pretty much identical rendering speeds with text_clipping on or off.
And now I'm not so sure about this result. Alan, can you try with the xcairo driver? It seems noticeably slower to me now with text_clipping on. Slow enough that I can almost see it drawing each string. -Hazen ------------------------------------------------------------------------------ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
