[cairo] Image-Data upload using SHM

Clemens Eisserer linuxhippy at gmail.com
Thu Oct 20 02:08:35 PDT 2011


I did some profiling of Firefox's html5 video element which uses
cairo, and the low performance I observed seems to be caused by not
using XShmPutImage for uploading video-data.
Instead, XPutImage is used - with xcb's 16kb buffer this results in
about ~25k cs/s, slowing my machine down to a crawl.

Does cairo support using the XSHM extensions, or are there patches available?

Thanks you in advance, Clemens

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