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Cache computed window.physicalSize in a FrameReference #15955
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ferhatb
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Landing on red. LUCI redness is Fuchsia infra failure. |
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flutter/engine@51a7964...4218f80 git log 51a7964..4218f80 --first-parent --oneline 2020-01-25 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from 7fqYj... to 35pbn... (flutter/engine#15984) 2020-01-25 nurhan@google.com updating the versions of the browsers for flutter web engine unit tests (flutter/engine#15977) 2020-01-25 chris@bracken.jp Eliminate unused import in Android embedding (flutter/engine#15975) 2020-01-24 matthew-carroll@users.noreply.github.com Prevent duplicate plugin registration in FlutterEnginePluginRegistry. (#49365) (flutter/engine#15956) 2020-01-24 dnfield@google.com retry logic for another cipd upload (flutter/engine#15974) 2020-01-24 gw280@google.com Ensure GetFixturesPath works on Fuchsia (flutter/engine#15978) 2020-01-24 nurhan@google.com [web] Calling platform message callback after copy (flutter/engine#15950) 2020-01-24 iska.kaushik@gmail.com [fuchsia] Expose view_ref as part of dart:fuchsia initialization (flutter/engine#15958) 2020-01-24 gw280@google.com Refactor ShellTest to allow for different ShellTestPlatformViews (flutter/engine#15972) 2020-01-24 yjbanov@google.com Cache computed window.physicalSize in a FrameReference (flutter/engine#15955) 2020-01-24 dnfield@google.com the the fix (flutter/engine#15973) 2020-01-24 ferhat@gmail.com Optimize drawRRect to use dom_canvas (flutter/engine#15970) 2020-01-24 ferhat@gmail.com Remove paint apply in draw image (flutter/engine#15969) 2020-01-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from 6_pZp... to 7fqYj... (flutter/engine#15966) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC aaclarke@google.com on the revert to ensure that a human is aware of the problem. To report a problem with the AutoRoller itself, please file a bug: https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
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Calling
html.window.physicalSizewith pending DOM writes triggers browser layout. This is particularly costly when we access physical size while painting (e.g. we do this when drawing text paragraphs). On some apps this costs up to 0.5ms each time it is called (e.g. once per paragraph).This change caches a lazily-computed size in a
FrameReference(which is cleared at the end of the frame). The first access that computes the initial value tends to be before we write anything to the DOM and therefore costs us nothing. Subsequent accesses, even after DOM write, use the cached value, and, again, cost nothing.In at least one of our customer apps, this significantly dropped the frame time, reducing total amount of browser layout time from 28% per frame down to 11% per frame, with overall frame times dropping by up to ~40%.
Tests: this is purely an optimization; there is no change in functionality, so existing tests should already cover this.