[Webkit-unassigned] [Bug 271185] New: Zoom doesn't affect all text metrics, resulting in jerky zoom

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Mar 18 15:01:23 PDT 2024


https://bugs.webkit.org/show_bug.cgi?id=271185

            Bug ID: 271185
           Summary: Zoom doesn't affect all text metrics, resulting in
                    jerky zoom
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: duncan at wilcox.it

Created attachment 470421

  --> https://bugs.webkit.org/attachment.cgi?id=470421&action=review

The test case

Attached test case shows how applying a zoom will not scale the text uniformly. Specifically it appears that every additional text line introduces an error. To illustrate this the test case changes the zoom continuously and plots the text block height, showing the discontinuous sizing and animation jerkiness. The same test on Chrome is perfectly smooth, and the respective plot shows a linear correlation between zoom and text block height.

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