[Webkit-unassigned] [Bug 230886] New: iOS 15 regression crash when drawing SVG image on canvas with scaling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230886

            Bug ID: 230886
           Summary: iOS 15 regression crash when drawing SVG image on
                    canvas with scaling
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kaput.sts at gmail.com
                CC: dino at apple.com

It seems that when downscaling a HTML canvas by factor F, and drawing an image with SVG source, upscaled by factor F, iOS 15 Safari crashes when F is large enough, even though these two factors should cancel out (1/F * F = 1).

I think it will draw the SVG to an intermediate texture F times the size of the SVG, in this case (F*1000)^2 pixels => kaboom.

This is a regression because it works on all other browsers, and works fine in iOS 13 and 14 Safari.

To reproduce, visit https://codepen.io/Ziriax/full/LYLgYxp

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