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r? @bholley
Source-Repo: https://github.com/servo/servo
Source-Revision: 1b2450339c40dbcb65e94a346ea434d45f0edf90
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r? @bholley
cc @heycam
Source-Repo: https://github.com/servo/servo
Source-Revision: cbf71a2cf39e792f75309e68f7cabe862d4a70eb
This commit adds hooks to the Servo style traversal to avoid traversing all the
DOM for every restyle. Additionally it changes the behavior of the dirty flag to
be propagated top down, to prevent extra overhead when an element is dirtied.
This commit doesn't aim to change the behavior on Servo just yet, since Servo does extra job when dirtying the node related with DOM revision counters that might be necessary.
CC @asajeffrey for the DOM revision counters stuff. When a node is dirty, do all its descendants really need to increment the revision counter, or is this an unintended effect? My intuition is that this is hurting performance quite a lot for servo.
r? @bholley
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Source-Repo: https://github.com/servo/servo
Source-Revision: 944d371b8f0e72f6aa5465be38c0c8daeab66127
Right now, there's a huge amount of complexity in T{Node,Element,Document} and friends because of the lifetime parameter.
Before I started generalizing this code for use by Gecko, these wrappers were plain structs. They had (and still have) a phantom lifetime associated with them to prevent references to DOM nodes from leaking past the end of restyle, when they might be invalidated by a GC.
When I generalized them, I decided to put the lifetime on the trait as well, since there are some situations where the lifetime is, in fact, necessary. Specifically, they are necessary for the compiler to understand that all the things borrowed from all the nodes and elements and so on have the same lifetime (the lifetime of the restyle), rather than the lifetime of whichever particular element or node pointer the value was borrowed from. This come up in situations where we do |let el = node.as_element()| or |let n = el.as_node()| and then borrow something from the result. The compiler thinks the borrow lifetime is that of |el| or |n|, when it's actually longer.
In practice though, I think the style and layout algorithms we use don't run into this issue much, and we can hack around it where it comes up. So I think we should remove the lifetimes from the traits, which will let us aggregate the embedding-provided traits together onto a single meta-trait and significantly simplify the code.
Source-Repo: https://github.com/servo/servo
Source-Revision: aea8d8959dcb157a8cc381f1403246ce8ca1ca00
This should be the last major hoisting necessary to use the style system standalone. \o/
Source-Repo: https://github.com/servo/servo
Source-Revision: ddc3b7942eea8328e9eb22d864d34fce572d5535
