Re: Cairo + GTK animation - high Xorg load
Stefan Salewski <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
On Thu, 2016-10-27 at 14:40 -0400, David J. Herzfeld wrote: > Actually, it's only 1000 points on a single line, not 1000 lines. So, I > figures this is pretty simplistic, and should have a relatively low > load. No, each call of cairo_line_to() draws a line segment from current location to new location. And cairo tries to do that as smooth as possible. The sine wave coordinates generally match in no way the integer screen cordinates, which may make smooth drawing more complicated, and for each segment many pixel are involved. So we draw 60000 line segments each second. Of course this is not much compared to shapes that modern graphic cards can generate. I have run your first example, and indeed X load increases when window size is increased. That was my obserbation for my schematics editor as well. Maybe upcomming wayland will impove the situation. I have done a short google search again, but have not found new results concerning cairo. There exists other libs which may be faster, for example skia. -- cairo mailing list [email protected] https://lists.cairographics.org/mailman/listinfo/cairo