[Webkit-unassigned] [Bug 250662] New: CreatePattern for zero height image should return null

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250662

            Bug ID: 250662
           Summary: CreatePattern for zero height image should return null
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                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

The first two steps of createPattern(img, repetition)

> 1. Let usability be the result of checking the usability of image.
> 2. If usability is bad, then return null.
— https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-createpattern-dev

The usability of the image is assessed as: 

> If image has an intrinsic width or intrinsic height (or both) equal to zero, then return bad.
https://html.spec.whatwg.org/multipage/canvas.html#check-the-usability-of-the-image-argument


The WPT test fails in Safari TP 161 while it pass in both firefox and chrome.
http://wpt.live/html/canvas/element/fill-and-stroke-styles/2d.pattern.image.zeroheight.html
https://wpt.fyi/results/html/canvas/element/fill-and-stroke-styles/2d.pattern.image.zeroheight.html

The code currently doesn't check the height of the image.
https://searchfox.org/wubkat/rev/18e40f7108b3aa25f33242319e32278e08e25e44/Source/WebCore/html/canvas/CanvasRenderingContext2DBase.cpp#1984-2015

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