[Webkit-unassigned] [Bug 237678] New: AX: AccessibilityObject::visibleCharacterRange is extremely slow when called on objects with lots of text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237678

            Bug ID: 237678
           Summary: AX: AccessibilityObject::visibleCharacterRange is
                    extremely slow when called on objects with lots of
                    text
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyler_w at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

In this example `sample` with 100 total samplings, visibleCharacterRange accounted for 95% of the runtime:

95   WebCore::AccessibilityObject::visibleCharacterRange() const + 1740 (WebCore + 17852704) [0x10d83a920]
  62   WebCore::AccessibilityRenderObject::boundsForRange(WebCore::SimpleRange const&) const + 904 (WebCore + 18023804) [0x10d86457c]
  36   WebCore::boundsForRects(WebCore::LayoutRect const&, WebCore::LayoutRect const&, WebCore::SimpleRange const&) + 292 (WebCore + 18022192) [0x10d863f30]
  26   WebCore::RenderObject::absoluteTextRects(WebCore::SimpleRange const&, WTF::OptionSet<WebCore::RenderObject::BoundingRectBehavior>) + 360 (WebCore + 33800176) [0x10e76fff0]
  25   WebCore::absoluteRectsForRangeInText(WebCore::SimpleRange const&, WebCore::Text&, WTF::OptionSet<WebCore::RenderObject::BoundingRectBehavior>) + 100 (WebCore + 33801512) [0x10e770528]
  18   WebCore::RenderText::absoluteQuadsForRange(unsigned int, unsigned int, bool, bool, bool*) const + 1588 (WebCore + 33927852) [0x10e78f2ac]
  18   WebCore::RenderObject::localToContainerQuad(WebCore::FloatQuad const&, WebCore::RenderLayerModelObject const*, WTF::OptionSet<WebCore::MapCoordinatesMode>, bool*) const + 292 (WebCore + 33784096) [0x10e76c120]

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