[Webkit-unassigned] [Bug 250146] New: Linear Gradient on Scaled Path Creates Errant Horizontal Lines

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250146

            Bug ID: 250146
           Summary: Linear Gradient on Scaled Path Creates Errant
                    Horizontal Lines
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonobrandel at gmail.com
                CC: dino at apple.com

Created attachment 464361

  --> https://bugs.webkit.org/attachment.cgi?id=464361&action=review

Left shows Safari with red horizontal line. Right shows Chrome rendering linear gradients correctly.

Go to https://codepen.io/jonobr1/full/rNrWjwb and draw a vertical line by clicking and dragging the mouse. In Chrome the linear gradient (from red at top to blue at bottom) draws correctly. In Safari, the shape draws correctly, but also adds an erroneous red horizontal line at the top. (See attached image where Safari is left and Chrome is right).

You can see the full code (editable) here: https://codepen.io/jonobr1/pen/rNrWjwb

I think it has something to do with saving and restoring the context at different scales to accommodate high dpi devices.

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