[Webkit-unassigned] [Bug 250659] New: ImageData object must initialize to source when the source is provided

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250659

            Bug ID: 250659
           Summary: ImageData object must initialize to source when the
                    source is provided
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
               URL: https://wpt.fyi/results/html/canvas/element/pixel-mani
                    pulation/2d.imageData.object.ctor.array.html?label=exp
                    erimental&label=master&aligned
                OS: Unspecified
            Status: NEW
          Keywords: BrowserCompat, WPTImpact
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karlcow at apple.com
                CC: dino at apple.com, webkit-bug-importer at group.apple.com

Test to reproduce the issue

var array = new Uint8ClampedArray(8);
var imgdata = new window.ImageData(array, 1, 2);
imgdata.data === array;


This returns false in Safari
and true in Firefox and Chrome.

The spec says:

> If source was given, then initialize the data attribute of imageData to source.
— https://html.spec.whatwg.org/multipage/canvas.html#initialize-an-imagedata-object


This makes Safari fail
https://github.com/web-platform-tests/wpt/blob/7a0b0c285b91a0b1fa08da58c964b82e5cf40733/html/canvas/element/pixel-manipulation/2d.imageData.object.ctor.array.html#L28
https://wpt.fyi/results/html/canvas/element/pixel-manipulation/2d.imageData.object.ctor.array.html?label=experimental&label=master&aligned

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