[Webkit-unassigned] [Bug 209326] New: [iOS] Images are not crisp in LayoutTests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209326

            Bug ID: 209326
           Summary: [iOS] Images are not crisp in LayoutTests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmaxfield at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

It looks like images are drawn into iOS as if the backing store is a retina backing store, which means images get interpolated.

This is a problem for many Web PlatformTests, like css/css-writing-modes/text-indent-vrl-016.xht, though there are many, many more (at least 90?). These tests show an image which is big and white with a precisely sized green square at some location/size, and compare it to a green div at a particular place. On macOS, the green part of the image matches the div exactly, but on iOS, the contents of the image seem to be antialiased, which means the green square is fuzzy, causing a reftest failure.

Screenshots attached.

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