[Webkit-unassigned] [Bug 82510] New: SVG content in scaled SVG <image> tag is sampled from unscaled image

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82510

           Summary: SVG content in scaled SVG <image> tag is sampled from
                    unscaled image
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: schenney at chromium.org
                CC: zimmermann at kde.org, krit at webkit.org


Created an attachment (id=134376)
 --> (https://bugs.webkit.org/attachment.cgi?id=134376&action=review)
Primary repro file, requires the other attachment

Consider the two attached files, one of which includes the other in a <image> element. The included content is a 100x100 SVG doc. It is included in a 100x100 <image> tag that is transformed to be 5x larger. The result is an image of the included SVG at 100x100 up-sampled to 500x500. This looks blurry, as one would expect.

We looked at the spec and it does not really say what to do here, but clearly the intent is for SVG content in an image tag to be rendered as accurately as possible, as this is the only avenue for including an entire SVG document in another SVG document. The spec clearly distinguishes between "raster" image data and SVG image data, leading us to believe that the spec does not think that SVG included using <image> shoudl actually be a raster image.

Firefox renders the SVG content at 500x500 and does not look blurred.

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