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Add a low priority scene builder thread. #2989

Merged
merged 3 commits into from
Sep 5, 2018
Merged

Add a low priority scene builder thread. #2989

merged 3 commits into from
Sep 5, 2018

Commits on Sep 5, 2018

  1. Add a low priority scene builder thread. 

    The low priority scene builder is an additional thread that can be used to perform some work before forwarding the transaction to the "normal" scene builder thread.
This lets us choose to rasterize very expensive content blobs without blocking the scene builder allowing updates of the UI disply list.
Since all low priority scenes request get forwarded to the regular scene builder as well, any operation that affects both threads (such as flushes or shutting down) can simply be sent to the low priority thread.
    @nical
    nical committed Sep 5, 2018
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  2. Expose low priority transactions in the API.

    @nical
    nical committed Sep 5, 2018
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  3. Make low priority transaction support optional. 

    This avoids the cost of an extra thread per renderer when we don't need it.
If support is disabled for a given renderer, low and high preirity transactions go to the same queue.
    @nical
    nical committed Sep 5, 2018
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