Bug 203770 – Fix the defaults of the SVGFEConvolveMatrixElement properties

• Status: NEW
• Component: SVG

[Said Abou-Hallawa]

Created attachment 382642 [details]
test case

Open the attached test case.

Expected results:

    Default value for feConvolveMatrix divisor property is: 1
    Default value for feConvolveMatrix orderX property is: 3
    Default value for feConvolveMatrix orderY property is: 3

The specs links are:

    https://www.w3.org/TR/SVG11/filters.html#feConvolveMatrixElementDivisorAttribute
    https://www.w3.org/TR/SVG11/filters.html#feConvolveMatrixElementOrderAttribute

[Said Abou-Hallawa]

Created attachment 382647 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 382647 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=382647&action=review

> Source/WebCore/svg/SVGFEConvolveMatrixElement.cpp:74
> +        if (parseNumberOptionalNumber(value, x, y) && (x < 1 || y < 1))
>              document().accessSVGExtensions().reportWarning("feConvolveMatrix: problem parsing order=\"" + value + "\". Filtered element will not be displayed.");
> +        m_orderX->setBaseValInternal(x);
> +        m_orderY->setBaseValInternal(y);

So we parse the values but set them anyway? Seems odd.

> Source/WebCore/svg/SVGFEConvolveMatrixElement.cpp:121
> +        if (parseNumberOptionalNumber(value, x, y) && (x <= 0 || y <= 0))
>              document().accessSVGExtensions().reportWarning("feConvolveMatrix: problem parsing kernelUnitLength=\"" + value + "\". Filtered element will not be displayed.");
> +        
> +        m_kernelUnitLengthX->setBaseValInternal(x);
> +        m_kernelUnitLengthY->setBaseValInternal(y);

Ditto.

[Ahmad Saleem]

Created attachment 459904 [details]
Safari 15.5 differs from other browsers

This issue is still present and reproducible in Safari 15.5 on macOS 12.4 while Chrome Canary 104 matches with Firefox Nightly 103. Thanks!

[Radar WebKit Bug Importer]

<rdar://problem/122586298>