Sure, I agree that if you're doing custom layout languages (Cassowary, etc.) Houdini is a win—the comment was more directed toward use of Houdini to reimplement layouts that can already be described with CSS. For those use cases, without seeing any numbers, I'm unconvinced of the performance benefits.
Patrick On Mon, Mar 16, 2015 at 6:01 PM, Robert O'Callahan <rob...@ocallahan.org> wrote: > > I have concerns about implementing full CSS algorithms in JS. People seem > to think that makes it fast by default. > > It's more that what people are currently doing is crazy slow. Namely, to > implement a custom layout today, you typically have to > a) identify some DOM elements to measure (typically the children of a > container with custom layout) > b) synchronously lay out the entire document > c) take some measurements > d) jiggle some CSS properties around those elements > e) lay out the entire document again for rendering > And that's the *best* case. When you have multiple independent custom > layouts in the same page, steps b)-d) will probably repeat multiple times. > For some layouts (e.g. if you need both minimum and preferred intrinsic > widths) you may need to repeat b)-d) multiple times just for a single > layout. > > It's easy to imagine how a custom layout API can beat that. > > Rob > -- > oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo > owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo > osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo > owohooo > osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o > oioso > oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo > owohooo > osoaoyoso,o o‘oYooouo ofooooolo!o’o owoiololo oboeo oiono odoaonogoeoro > ooofo > otohoeo ofoioroeo ooofo ohoeololo. > _______________________________________________ > dev-servo mailing list > dev-servo@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-servo > _______________________________________________ dev-servo mailing list dev-servo@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-servo
