[Webkit-unassigned] [Bug 221005] Incorrect sizing of uploaded images when using background-size:cover

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221005

--- Comment #7 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
I take that back. The floor.jpg image has an EXIF rotation, so we get to GraphicsContext::drawPlatformImage() and hit this branch:

            if (options.orientation() != ImageOrientation::None) {
                if (auto transform = options.orientation().transformFromDefault(imageSize).inverse())
                    subimageRect = transform.value().mapRect(subimageRect);
            }

which is where I think things go wrong. We also hit the subsequent assertion:
    ASSERT(CGImageGetHeight(subImage.get()) == currHeight - CGRectIntegral(srcRect).origin.y);

Attaching a standalone testcase.

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