[Bug 27139] html5 ogg video playback in firefox unusable

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Aug 12 05:45:44 PDT 2010


https://bugs.freedesktop.org/show_bug.cgi?id=27139

--- Comment #13 from Karl Tomlinson <bugs.freedesktop at karlt.net> 2010-08-12 05:45:44 PDT ---
Thanks Alex, for clearly pointing to the cause of the fallback.

And Michel, you are probably right that RepeatPad with a clip would be suitable
for Firefox.  I'll see if I can make that change.  One of the reasons for
Firefox using RepeatNone though was to work around cairo falling back to
software to work around server-side render bugs with RepeatPad.

I'm puzzled by / curious about two things:

1. I don't think/recall that this issue was noticeable with user mode setting.
   The same fallback happens without kms, right?
   Is the migration policy different with kms, or why the apparent regression?

2. The fallback composite seems much slower than even fetching a snaphot of
   the whole screen.
   Is the vram being accessed via mmap or similar rather than a faster bulk
   fetch?  (Is this what Pauli was implying?)

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