stylo: Improve restyling performance
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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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
might rely on a full bottom up reconstruction of the flows. I'll need to double
check and implement that separately.
style: Rewrite the restyle hints code to allow different kinds of element snapshots.
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This is a rewrite for how style interfaces with its consumers in order to allow
different representations for an element snapshot.
This also changes the requirements of an element snapshot, requiring them to
only implement MatchAttr, instead of MatchAttrGeneric. This is important for
stylo since implementing MatchAttrGeneric is way more difficult for us given the
atom limitations. This also allows for more performant implementations in the
Gecko side of things.
I don't want to get this merged just yet, mainly because the stylo part is not
implemented, but I'd like early feedback from @bholley and/or @heycam: How do
you see this approach? I don't think we'll have much problem to implement
MatchAttr for our element snapshots, but... worth checking.
r? @heycam
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This is a rewrite for how style interfaces with its consumers in order to allow
different representations for an element snapshot.
This also changes the requirements of an element snapshot, requiring them to
only implement MatchAttr, instead of MatchAttrGeneric. This is important for
stylo since implementing MatchAttrGeneric is way more difficult for us given the
atom limitations. This also allows for more performant implementations in the
Gecko side of things.
Removed panic channel, replaced by integrated logging and issue reporting
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Remove the previous ad hoc panic channel, replace it by an integrated logging and panicking mechanism, including crash reporting. All thread panics are now reported, not just content threads.
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- [X] These changes fix#11838
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Use Result instead of panicking when the resource dir can't be found
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Introduce safer layer of sugar for nsStyleUnion
This routes (almost) all access to nsStyleUnion through a largely safe interface, CoordData.
It also introduces a corresponding Rust enum, CoordDataValue, which can be used when interacting with CoordData
LLVM should optimize the costs away in release mode. eddyb tested this a bit, and LLVM has no trouble threading matches together with inlining -- so all of the matches using enums here will have the same generated code as the old matches on the units.
Some unresolved questions:
Should I provide convenience methods like `set_coord`, `set_auto`, etc on CoordData? `.set_enum(CoordDataValue::Something)` should optimize down to the same thing, but the convenience methods look cleaner and won't load the optimizer as much.
Also, we're converting immutable references to mutable ones, which can be used to cause unsafety using some acrobatics. Perhaps a trait-based approach is better?
The issue is that in some places we only have a `&CoordData` (eg copy_from), but CoordData internally is `*mut`. It would be nice if CoordData could parametrize over its mutability, but Rust doesn't let us do that.
The alternate approach is to make CoordData a trait (also CoordDataMut). The trait requires you to implement `get_union()` and `get_unit()`, and gives you the rest of the functions for free. `nsStyleCoord` would directly implement both traits. `nsStyleSides` would have `data_at(idx)` and `data_at_mut(idx)` methods which return a struct `SidesData` containing a reference to the Sides and the index, which itself implements the `CoordData` and `CoordDataMut` trait (we need two traits here because there will have to be two `SidesData` structs).
I decided not to implement the traits approach first since it's pretty trivial to change this code to use traits, and the current design is more straightforward.
Thoughts?
r? @bholley
cc @emilio @heycam
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style: Add support to test animations programatically.
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r? @SimonSapin for the style changes, @Ms2ger or @jdm for the dom and test changes
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Remove clipboard crate to due disallowed usage of GPL code
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Fixes#7578, removing usage of rust-clipboard, which contains a disallowed dependency on GPL code.
r? @metajack
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Support generating bindings for MSVC
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This pull request includes several patches to the binding generating script to make it work with MSVC. The generated files are not updated because they may not be compatible with other platforms which the majority of developers are working on.
Only `regen.py` is modified. The two `.sh` files are not. Those files are very platform-specific and I don't think it's worth to make them work on Windows at all, and my hope is that we can get rid of those files and only use `regen.py`. I imagine the only left steps to get there are:
1. make clang version detectable via `bindgen` so that we get reliable clang version without needing to duplicate the library searching work (which has already been done in `clang-sys`)
2. checkout the git repo inside the python script and run `cargo build` there
BTW, it seems to me nightly Rust is not required to build `bindgen`, and thus we can probably get rid of the `multirust` detection. (Even if we need that, I think we should prefer `rustup` and optionally fallback to `multirust`. I know `rustup` is not yet available on Homebrew, though...)
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r? @emilio
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Add FFI glue for Gecko to implement 1-arg CSS.supports() with stylo.
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This adds an FFI function for Gecko to call to implement the 1-arg version of `CSS.supports()`. This will be useful for producing an automated analysis of CSS properties we lack support for in geckolib. Corresponding Gecko bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1287382
r? @emilio
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