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fix: disable background throttling also in the viz::DisplayScheduler (#38924)

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* fix: disable background throttling also in the `viz::DisplayScheduler`

`viz::DisplayScheduler` is responsible for drawing and swapping frames
in the `DisplayScheduler::DrawAndSwap` which is called from the
`DisplayScheduler::AttemptDrawAndSwap` if the `DisplayScheduler::ShouldDraw`
returns true. `ShouldDraw` depends on the `DisplayScheduler` visibility
and when it is not visible then it returns false.

In order to keep producing frames, disabling `backgroundThrottling`
should also prevent changing `DisplayScheduler` visibility to false.

`DisplayScheduler` lives in the `ui::Compositor` where every
`electron::NativewWindow` has its own `Compositor`. `electron::NativewWindow`
may be host of the multiple `electron::api::WebContents` instances which may
have different `WebPreferences` settings. Therefore if at least one
of the `WebContents` requires disabling throttling then all other `WebContents`
using the same window will have it disabled in the `ui::Compositor`.

BREAKING CHANGE:
`backgroundThrottling` set to false will disable frames throttling
in the `BrowserWindow` for all `WebContents` displayed by it.

Close: [#31016](https://github.com/electron/electron/issues/31016)

* fixup! fix: disable background throttling also in the `viz::DisplayScheduler`

* fixup! fix: disable background throttling also in the `viz::DisplayScheduler`

* fixup! fix: disable background throttling also in the `viz::DisplayScheduler`

---------

Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>
This commit is contained in:
michal-pichlinski-openfin 2023-09-26 22:00:46 +02:00 • committed by GitHub
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6
docs/api/structures/web-preferences.md
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@ -74,7 +74,11 @@
* `defaultEncoding` string (optional) - Defaults to `ISO-8859-1`.
* `backgroundThrottling` boolean (optional) - Whether to throttle animations and timers
when the page becomes background. This also affects the
[Page Visibility API](../browser-window.md#page-visibility). Defaults to `true`.
[Page Visibility API](../browser-window.md#page-visibility). When at least one
[webContents](../web-contents.md) displayed in a single
[browserWindow](../browser-window.md) has disabled `backgroundThrottling` then
frames will be drawn and swapped for the whole window and other
[webContents](../web-contents.md) displayed by it. Defaults to `true`.
* `offscreen` boolean (optional) - Whether to enable offscreen rendering for the browser
window. Defaults to `false`. See the
[offscreen rendering tutorial](../../tutorial/offscreen-rendering.md) for