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Mark BackdropFilter as inheriting opacity, enabling fading of BDFs #34435

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merged 1 commit into from
Jul 7, 2022
Merged

Mark BackdropFilter as inheriting opacity, enabling fading of BDFs #34435

merged 1 commit into from
Jul 7, 2022

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flar
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@flar flar commented Jul 1, 2022

Customers have complained about BackdropFilter not working well with an enclosing OpacityLayer. This led to a bug in iOS dialogs from a few years back (see flutter/flutter#31706).

While this PR does not solve all cases where a BackdropFilter was nullified by being inside an enclosing saveLayer, it does solve a common case where the BackdropFilter is a direct (and only) child of an OpacityLayer.

Basically the fix is to mark the BackdropFilterLayer as able to inherit opacity which allows it to combine the opacity of a parent OpacityLayer into its own saveLayer.

Some refactoring of the AutoCachePaint facility was involved to more easily enable sharing of the object for both DisplayList and SkCanvas paths in the layers (as the 2 rendering variants of BackdropFilterLayer now need to do).

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flar commented Jul 1, 2022

CC @antholeole who was running into this issue recently

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I can confirm that this unblocks me!

Before:
https://user-images.githubusercontent.com/48811365/176983029-9666e3be-4ec5-4c55-a024-b40217c7f18a.mov

After:
https://user-images.githubusercontent.com/48811365/176983047-95718301-66cf-4e9f-b888-4708dcff80f5.mov

Thanks for the fix! This is awesome :)

@zanderso zanderso requested a review from bdero July 2, 2022 02:29
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There's a bit of logspam, not sure if this is because I pulled your branch first and merged this over:

[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
... (~20x)

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bdero commented Jul 6, 2022

Haven't looked at the log spam mentioned above, but setting opacity on BDF layers is fine in Impeller.

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flar commented Jul 6, 2022 •
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There's a bit of logspam, not sure if this is because I pulled your branch first and merged this over:

[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
... (~20x)

Thanks for checking! There should be a pre-check that maybe doesn't reject pushes, but indicates if there are new calls to FML_LOG in them.

Actually, I don't see that any more. Were you running off the patch I sent for testing rather than the PR patch?

@flar flar added the autosubmit Merge PR when tree becomes green via auto submit App label Jul 6, 2022
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There's a bit of logspam, not sure if this is because I pulled your branch first and merged this over:

[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
[VERBOSE-2:backdrop_filter_layer.cc(58)] Inherited opacity: 0x70000a6b8f30
... (~20x)

Thanks for checking! There should be a pre-check that maybe doesn't reject pushes, but indicates if there are new calls to FML_LOG in them.

Actually, I don't see that any more. Were you running off the patch I sent for testing rather than the PR patch?

Yep, you're right. I pulled but didn't rebuild, sorry about that. No logs in the most recent commit :)

@auto-submit auto-submit bot merged commit 5c86c96 into flutter:main Jul 7, 2022
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engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Jul 7, 2022
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5c86c96 Mark BackdropFilter as inheriting opacity, enabling fading of…
7b6e563 
… BDFs (flutter/engine#34435)
@engine-flutter-autoroll engine-flutter-autoroll mentioned this pull request Jul 7, 2022
Merged
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Jul 7, 2022
@engine-flutter-autoroll
5c86c96 Mark BackdropFilter as inheriting opacity, enabling fading of…
5e8aee2 
… BDFs (flutter/engine#34435)
@flar flar mentioned this pull request Jul 7, 2022
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@antholeole antholeole mentioned this pull request Jul 12, 2022
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