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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 21 Sep 2018
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      My thinking has changed on browser compositors a bit: they’re a necessary evil, but they should be treated as a power savings optimization (primarily when scrolling is involved), not as the way to get fast animations.

      1 reply 1 retweet 16 likes
    2. Benjamin Brittain‏ @Brittain_Ben 21 Sep 2018
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      Replying to @pcwalton

      What caused this change in opinion?

      1 reply 0 retweets 1 like
    3. Patrick Walton‏ @pcwalton 21 Sep 2018
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      Replying to @Brittain_Ben

      Seeing how much energy you use on macOS if you recompose every frame and don’t use Core Animation. Note that this is situational: I still think a browser compositor isn’t worth it on some OS’s. Only on OS’s like macOS where the OS is inserting a hidden blit does it matter.

      1 reply 0 retweets 0 likes
    4. Patrick Walton‏ @pcwalton 21 Sep 2018
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      Replying to @pcwalton @Brittain_Ben

      For example, in an OS where the browser had exclusive access to the GPU and display, I wouldn’t be inclined to go with a compositor. Just use WebRender directly.

      2 replies 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 21 Sep 2018
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      Replying to @pcwalton @Brittain_Ben

      But on Windows, macOS, and Linux with Wayland subsurface support, you can save the OS a full window blit if you divide your page up into tiles or something and do partial presents. Basically this is because OS compositors are too simple to handle CSS in its full generality.

      8:43 PM - 21 Sep 2018 from Dogpatch, San Francisco
      2 replies 0 retweets 0 likes
        1. Patrick Walton‏ @pcwalton 21 Sep 2018
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          Replying to @pcwalton @Brittain_Ben

          Or, another way to look at it: On typical OS’s you’ve got a compositor sitting there whether you want it or not. Might as well make the best use of it you can.

          0 replies 0 retweets 2 likes
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        2. Bruce Mitchener‏ @ArmyOfBruce 21 Sep 2018
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          Replying to @pcwalton @Brittain_Ben

          What if WebRender was, roughly speaking, in the OS layer?

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton 22 Sep 2018
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          Replying to @ArmyOfBruce @Brittain_Ben

          That’s what I was getting at with “in an OS where the browser had exclusive access to the GPU and display” :)

          1 reply 0 retweets 1 like
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