This patch fixes a couple of issues in the compositor:
1) Remove the delayed composition code. Previously, this would schedule
a composite for 12ms in the future. This doesn't really make any sense
with WR. There's no point in doing a composite unless WR has provided
a new frame to be drawn. This fixes issues in several benchmarks where
we were doing multiple composite / renders per rAF, which is a waste
of CPU time. This *does* make the framerate slower in some cases (such
as a slow rAF callback) but it's more correct - otherwise we were just
compositing the same frame multiple times for no real benefit.
2) Inform the window of the current animation state of the compositor.
Specifically, if an animation (or rAF) is currently active, the
window system switches to use event polling, and does not block on
the OS-level event loop. In the case of active animation, we just
assume that we want to be running as the vsync interval and not
blocking. This means the compositor thread only sleeps on vsync
during animation, which reduces OS scheduling and results in much
smoother animation.
Separate waking the event loop, from communicating with Compositor
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@paulrouget first step of #15934, Glutin only for now, please take a look...
If this makes sense, I will also update the code for ports other than Glutin...
One question: one do I add the `warn!` macro to `servolib`? Also perhaps we would also want to add `box`, since I had to switch to using `Box::new`...
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remove no-op viewport code
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- [x] These changes fix#16809 (github issue number if applicable).
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Scroll roots are no longer nested containers holding items, so instead
we need to track the offsets of each, carefully handling fixed position
items and stacking contexts that create new reference frames.
Additionally, we remove the complexity of the pre-computed page scroll
offset, instead opting to send script scrolls to the layout task in
order to more quickly have a ScrollState there that matches the
script's idea of the scroll world.
Fixes#16405.
Don't update iframe pipeline until load completes
To preserve the previous functionality of delaying load events when a
new navigation is triggered, pending pipeline id represents the
current pending load. The load event is only fired if the load message's
pipeline id matches the pending pipeline id.
Track frame size on Frame instead of Pipeline
Disabled matchMedia test
Track creator pipeline id
Notify embedder when history changes
`WindowMethods::set_page_url` is only called when the embedder set the URL. It is not called when the page url is updated. I believe that instead we should just pass the URL to `head_parsed`.
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Just use WebRender's ClipId directly. This will allow us to create and
use ReferenceFrames in the future, if we need to do that. It will also
make it easier to have Servo responsible for creating the root
scrolling area, which will allow removing some old hacks in the future.
WebRender currently makes a distinction between an external ClipId with
id equal to 0 and the root scroll ClipId. We need to detect this
situation and properly form the ClipId for the root.
- Tidy and optimize the batching code.
- Support tiling / repeat for linear and radial gradients.
- Fix some edge cases of subpixel text AA.
- Add clip mask support to border shaders.
- Optimization to text run creation on CPU.
- Handle more box-shadow clipping cases.
- Fix a panic that could occur when window size is 0.
- Clip / scroll API improvements.
Now that WebRender can handle splitting scrolling layers on its own, we
don't need to do any work to split up scroll roots. This should also
make it possible to handle overflow:scroll and containing block scroll
roots in the future.
Let the embedder decide if servo should follow a link or not
We want to give a chance to the embedder to handle a link itself.
Is it a problem that this will add a round trip to the main thread every time `load_url` is called?
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This includes a WR update that improves pixel snapping. Specifically,
the non-transform shader now snaps to device pixels in world space,
rather than local space.
This makes 31 new tests pass, and adds 4 new failures.
Of the new failures:
- The three background size tests appear to be an OSMesa accuracy
issue. Near the bottom of the image, a small number of pixels
are different from the reference by a value of 1.0 / 255.0. I've
confirmed on 3 real GPUs and also on llvmpipe that the tests
match on those devices. This would be a good case for fuzzy test
support in WPT.
- The other failing test appears to have unreasonable accuracy
requirements as it also fails on Gecko and Chromium in the same
way that the test now fails on WR.
Implement home end key scrolling
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* Refactor all scroll related code to use a new `ScrollLocation` struct which can either be a `delta` (as before) or a `Start` or `End` request, to represent the desire to scroll to the start and end of the page.
Effectively, everywhere a delta was used, there is now a `ScrollLocation` struct instead.
* Add key press listeners for HOME and END keys so as to cause a scroll to be queued with `ScrollLocation::Start` (in HOME case) or `ScrollLocation::End` (in END case).
* These changes depend on added support for the new `ScrollLocation` in webrender and webrender_traits. See https://github.com/servo/webrender/pull/540.
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Refactor to send iframe resize messages directly from layout thread to constellation
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r? @jdm
passing tests:
tests/wpt/mozilla/tests/css/matchMedia.html, tests/wpt/mozilla/tests/mozilla/window_resize_not_triggered_on_load.html, tests/wpt/mozilla/tests/mozilla/iframe/resize_after_load.html, tests/wpt/mozilla/tests/css/meta_viewport_resize.html
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FIX for Implement scroll transactions
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Follow up on https://github.com/servo/servo/pull/14470
@mbrubeck @KiChjang @glennw I just found out in the context of https://github.com/servo/webrender/pull/600 I forgot to add a case for the very first scroll event, or else the scrolling on that PR, in a non-Mac OS environment, will only start after an 80ms pause following the initial scroll event...
Sorry this slipped through my initial testing...
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Implement scroll transactions
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@glennw Here is a first pass at faking Start scroll events by way of 'transactions', as suggested by @mstange at https://github.com/servo/webrender/pull/599#issuecomment-263323105
Since I still don't have a Linux environment available for testing(and my Mac doesn't have enough resources to run a VM at the moment), I tested this with both https://github.com/servo/webrender/pull/599 and https://github.com/servo/webrender/pull/600 on a Mac by:
* disabling start and end events by removing the content of these two functions: https://github.com/servo/servo/blob/master/components/compositing/compositor.rs#L1080 and https://github.com/servo/servo/blob/master/components/compositing/compositor.rs#L1093
* Setting `CAN_OVERSCROLL` to false for Mac OS in Webrender https://github.com/servo/webrender/blob/master/webrender/src/frame.rs#L29
* This PR also requires a `./mach update-cargo -a`
The desired behavior of both Webrender PR's, based on my manual testing, now also works when there are no end or start scroll events provided by the os. The scroll transactions do not affect normal scrolling on Mac OS, and both PR still work as before on that platform.
Both PR in Webrender need some re-basing and cleaning up, as does this one, and I first wanted to put this proposal forward, and also ask if someone has the time to do some testing in a real Linux environment...
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