[Webkit-unassigned] [Bug 248222] New: Not all consecutively centered SVGs are grid fitted

Tue Nov 22 06:29:37 PST 2022

https://bugs.webkit.org/show_bug.cgi?id=248222

            Bug ID: 248222
           Summary: Not all consecutively centered SVGs are grid fitted
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tobfa at cendio.com
                CC: sabouhallawa at apple.com, zimmermann at kde.org

Created attachment 463663

  --> https://bugs.webkit.org/attachment.cgi?id=463663&action=review

Comparison SVG grid fitting

I am dealing with SVG images which may vary in terms of even/uneven whole pixel widths. They should be centered on the page above one another, and the expected result is that whole pixels are preserved, i.e. no color blending rendition. Since some are of even pixel widths, and vice versa, they cannot possible all be perfectly centered, but some should rather be nudged by the browser and aligned whole-pixel with the browser grid. 

I am attaching two test case SVGs containing a striped 4px and 5px pattern respectively, and the HTML code snippet is written below. Furthermore, I am attaching screenshots taken on a Mac (13.0.1, normal dpi) workstation depicting the output from Firefox (107.0), Google Chrome (107.0.5304.110), and Safari (16.1 [18614.2.9.1.12]), where the Firefox output is the preferred behavior. 

HTML CODE:
=============
<!DOCTYPE html>
<html>
  <body style="text-align: center;">
    <div style="height: 8px;">
      <img src="lines_4.svg" />
    </div>
    <div style="height: 8px;">
      <img src="lines_5.svg" />
    </div>
  </body>
</html>

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