-
Notifications
You must be signed in to change notification settings - Fork 26.8k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Add more warm up frame docs #150464
Add more warm up frame docs #150464
Conversation
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
LGTM
A warm-up frame may never actually render (as the engine did not request | ||
it and therefore does not have a valid context in which to paint), but it |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
A warm-up frame may never actually render (as the engine did not request | |
it and therefore does not have a valid context in which to paint), but it | |
Depending on the platform implementation, the warm-up frame might cause the first frame to appear slightly earlier | |
than without, or might not be presented at all. In either case, it |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
I think the "engine context" is not important. And I suggest clarifying the side effect of the first frame time (if I understand the mechanism correctly)
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Hm maybe instead of "engine context" I'll tweak this to say something like:
... as it invokes
FlutterView.render
outside of the scope ofPlatformDispatcher.onBeginFrame
orPlatformDispatcher.onDrawFrame
That phrasing would be more accurate while also giving some useful context. These are meant to be contributor-facing docs, so I think these kinds of details might be useful.
and painting, which can together take several milliseconds. Thus, when the | ||
engine requests a real frame, much of the work will already have been | ||
completed, and the framework can generate the frame with minimal | ||
additional effort. |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
and painting, which can together take several milliseconds. Thus, when the | |
engine requests a real frame, much of the work will already have been | |
completed, and the framework can generate the frame with minimal | |
additional effort. | |
and painting, which allows the first real frame to be generated accumulatively, shortening the delay. |
Maybe a more concise way?
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
I agree the current text is verbose, but I think it's clearer. Personally, I'd prefer to optimize for clarity here. (I stole this text from the framework's docs, not tooting my own horn here 😂)
|
||
At startup, a warm-up frame can be produced before the Flutter engine has reported the | ||
initial view metrics using [PlatformDispatcher.onMetricsChanged][onMetricsChanged]. | ||
As a result, the first frame can be produced with a size of zero. |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Is this paragraph really needed? Is it something that really confuses people?
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
We can probably just count this case as another case of "the warm up frame is not presented at all".
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Hey there, I agree this paragraph is a bit deep in the weeds. But this topic is the reason why I sent this pull request, as a follow-up to answering this question: #149974
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
I see, thanks for explanation!
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Thanks for the work! In general I think this is good change. I have some suggestion, but none of them are strong.
If possible, it might be worthwhile asking someone who's not familiar with this topic to see if the docs make enough sense.
|
||
At startup, a warm-up frame can be produced before the Flutter engine has reported the | ||
initial view metrics using [PlatformDispatcher.onMetricsChanged][onMetricsChanged]. | ||
As a result, the first frame can be produced with a size of zero. |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
We can probably just count this case as another case of "the warm up frame is not presented at all".
* master: (23 commits) Roll pub packages (flutter#150810) Remove reference to `MaterialApp` and `showCupertinoModalPopup` from `CupertinoAlertDialog` (flutter#150725) Read `AndroidManifest.xml` and emit `manifest-impeller-(enabled|disabled)` analytics (flutter#150791) [flutter_tools] Shut down Chromium cleanly using a command sent through the debug protocol (flutter#150645) Reland fix inputDecorator hint color on M3 (flutter#150278) Roll Flutter Engine from 62e0b5f9c340 to 94023d711db3 (7 revisions) (flutter#150797) Fix collapsed InputDecorator minimum height (flutter#150770) Add more warm up frame docs (flutter#150464) Roll pub packages (flutter#150739) Add `focusNode`, `focusColor`, `onFocusChange`, `autofocus` to `CupertinoButton` (flutter#150721) Document RenderObject._relayoutBoundary and its invariant; small refactors (flutter#150527) Roll Flutter Engine from 6313b1e5afd7 to 62e0b5f9c340 (1 revision) (flutter#150790) fix a typo (flutter#150682) Fix link in RenderObjectWidget doc comment (flutter#150600) Roll Flutter Engine from fbd92055f3a6 to 6313b1e5afd7 (1 revision) (flutter#150781) [tool] make `ErrorHandlingFileSystem.deleteIfExists` catch error code 3 (`ERROR_PATH_NOT_FOUND` on Windows) (flutter#150741) Roll Packages from 711b4ac2794e to 03f5f6d5660c (21 revisions) (flutter#150779) Roll Flutter Engine from afa7ce19bca8 to fbd92055f3a6 (1 revision) (flutter#150777) Reland Add tests for form_text_field.1.dart (flutter#150481) (flutter#150696) (flutter#150750) Add an example for CupertinoPopupSurface (flutter#150357) ...
Updated the wiki to call out the warm up frame. This contains details from the following pages:
flutter/packages/flutter/lib/src/scheduler/binding.dart
Lines 994 to 1016 in b98d485
Part of #149974
Pre-launch Checklist
///
).If you need help, consider asking for advice on the #hackers-new channel on Discord.