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Revert "Use border box or layout overflow rect for layout shift tracking" #24840

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merged 1 commit into from Aug 1, 2020

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@chromium-wpt-export-bot chromium-wpt-export-bot commented Aug 1, 2020

This reverts commit 0933392f84b4bb96466bd86c0e814d96f63ba137.

Reason for revert: ASAN/MSAN failures due to "use of uninitialized value"; see e.g. https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8873209606965810848/+/steps/browser_tests/0/logs/Deterministic_failure:_AllForms__x2f_FormStructureBrowserTest.DataDrivenHeuristics__x2f_148__status_FAILURE_/0

Original change's description:

Use border box or layout overflow rect for layout shift tracking

This CL addresses the following issues of layout shift tracking:

  • Changed visual overflows triggered layout shift report
    (originally filed as crbug.com/1090763).
  • Descendant layout overflows were not included in ancestor's layout
    shift report.
  • Unnecessary descendant layout shift report.
  • Slow visual rect calculation for LayoutInline and LayoutText.

It includes the following changes

  • Track LayoutBoxes and LayoutTexts only.
  • Track both old and new starting points and visual representations
    instead of using location of visual rects as starting points.
  • For a LayoutBox, the local visual representation is the layout
    overflow rect if the LayoutBox has layout overflow and doesn't clip
    overflow. Otherwise use the border box rect.
  • For a LayoutText, suppose its shift causes shift of all contents
    in containing block logically below the LayoutText, and use that
    part of visual representation of the containing block as the visual
    representation of the shift.
  • Map both local starting points and local visual representations to
    the initial containing block and viewport.

This has the following benefits:

  • More accurate starting points and visual representations, conforming
    to the specs;
  • Better performance by
    • avoiding unnecessary layout shift reports of descendants
    • avoiding slow LayoutInline and LayoutText visual rect calculation.
  • sizeof(LayoutObject) is reduced by 16 bytes because now we use the
    previous geometry data in LayoutBoxes for paint invalidation.

Bug: 1108622
Change-Id: I7ebb4e250e7ca2a03b4dadea50034e300e55ad84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319538
Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793806}

TBR=wangxianzhu@chromium.org,skobes@chromium.org,kojii@chromium.org

Change-Id: I590f2abc4a48ba65bdfe7a948ffce00b299f9e06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1108622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333578
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793874}

…ing"

This reverts commit 0933392f84b4bb96466bd86c0e814d96f63ba137.

Reason for revert: ASAN/MSAN failures due to "use of uninitialized value"; see e.g. https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8873209606965810848/+/steps/browser_tests/0/logs/Deterministic_failure:_AllForms__x2f_FormStructureBrowserTest.DataDrivenHeuristics__x2f_148__status_FAILURE_/0

Original change's description:
> Use border box or layout overflow rect for layout shift tracking
>
> This CL addresses the following issues of layout shift tracking:
> - Changed visual overflows triggered layout shift report
>   (originally filed as crbug.com/1090763).
> - Descendant layout overflows were not included in ancestor's layout
>   shift report.
> - Unnecessary descendant layout shift report.
> - Slow visual rect calculation for LayoutInline and LayoutText.
>
> It includes the following changes
> - Track LayoutBoxes and LayoutTexts only.
> - Track both old and new starting points and visual representations
>   instead of using location of visual rects as starting points.
> - For a LayoutBox, the local visual representation is the layout
>   overflow rect if the LayoutBox has layout overflow and doesn't clip
>   overflow. Otherwise use the border box rect.
> - For a LayoutText, suppose its shift causes shift of all contents
>   in containing block logically below the LayoutText, and use that
>   part of visual representation of the containing block as the visual
>   representation of the shift.
> - Map both local starting points and local visual representations to
>   the initial containing block and viewport.
>
> This has the following benefits:
> - More accurate starting points and visual representations, conforming
>   to the specs;
> - Better performance by
>   * avoiding unnecessary layout shift reports of descendants
>   * avoiding slow LayoutInline and LayoutText visual rect calculation.
> - sizeof(LayoutObject) is reduced by 16 bytes because now we use the
>   previous geometry data in LayoutBoxes for paint invalidation.
>
> Bug: 1108622
> Change-Id: I7ebb4e250e7ca2a03b4dadea50034e300e55ad84
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319538
> Reviewed-by: Steve Kobes <skobes@chromium.org>
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#793806}

TBR=wangxianzhu@chromium.org,skobes@chromium.org,kojii@chromium.org

Change-Id: I590f2abc4a48ba65bdfe7a948ffce00b299f9e06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1108622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333578
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793874}
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The review process for this patch is being conducted in the Chromium project.

@chromium-wpt-export-bot chromium-wpt-export-bot merged commit 0e4384b into master Aug 1, 2020
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@chromium-wpt-export-bot chromium-wpt-export-bot deleted the chromium-export-491b5a9cbe branch Aug 1, 2020
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