[Webkit-unassigned] [Bug 194903] Transform-origin on SVG breaks when zoom in or out

Fri Mar 15 15:34:51 PDT 2019

https://bugs.webkit.org/show_bug.cgi?id=194903

--- Comment #23 from Joseph Pecoraro <joepeck at webkit.org> ---
Comment on attachment 363972
  --> https://bugs.webkit.org/attachment.cgi?id=363972
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=363972&action=review

> LayoutTests/ChangeLog:8
> +        Test still needs some work to avoid antialiasing diffs.

To avoid antialiasing diffs you could use SVG transforms:

    <!DOCTYPE html>
    <html>
    <head>
        <style>
            body {
                margin: 0;
            }
            rect {
                transform-box: view-box;
            }
        </style>
        <script>
            function doTest()
            {
                const zoomCount = 2;
                for (let i = 0; i < zoomCount; ++i)
                    eventSender.zoomPageIn();
            }
            window.addEventListener('load', doTest, false);
        </script>
    </head>
    <body>
        <svg width="500" height="400" viewBox="0 0 500 400" xmlns="http://www.w3.org/2000/svg">
            <rect x="50" y="50" width="80" height="80" fill="gray"/>
            <rect x="50" y="50" width="80" height="80" fill="green" transform="rotate(90 130 130)"/>

            <rect x="250" y="100" width="80" height="80" fill="gray"/>
            <rect x="210" y="60" width="120" height="120" fill="green" transform="rotate(90 330 180)"/>

            <rect x="50" y="250" width="80" height="80" fill="gray"/>
            <rect x="50" y="250" width="80" height="80" fill="green" transform="translate(80 0)"/>
        </svg>
    </body>
    </html>

But I'm not sure if this will be a great test then, because we'd like to compare to CSS transforms.

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