[GPU Process] (REGRESSION r285597): Fix SVGFilter clamping calculation

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Said Abou-Hallawa]

Before r285597, there were two transformations for SVGFilter: (1) the transform from the renderer of the SVGFilter to the outer root and (2) the clamping scale. But since we use only the scaling part of the outer root transformation in scaling the SVGFilter, in r285597 the clamping scale and the outer root scale were merged in one FloatSize called filterScale.

But I misunderstood the purpose and the arguments of ImageBuffer::sizeNeedsClamping(). And I think also there is a bug in SVGRenderingContext::createImageBuffer(). In this bug the following layout tests should be un-skipped.

webkit.org/b/232705 imported/blink/svg/filters/filter-huge-clamping.svg [ Skip ]
webkit.org/b/232705 svg/filters/big-sized-off-viewport-filter.svg [ Skip ]

[Said Abou-Hallawa]

Created attachment 445933 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 445933 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=445933&action=review

> Source/WebCore/rendering/CSSFilter.h:53
> +    RefPtr<FilterEffect> lastEffect() const override;

or final?

> Source/WebCore/svg/graphics/filters/SVGFilter.h:45
> +    RefPtr<FilterEffect> lastEffect() const override { return !m_expression.isEmpty() ? m_expression.last() : nullptr; }

final

[Said Abou-Hallawa]

Created attachment 445951 [details]
Patch

[EWS]

Committed r286526 (244858@main): <https://commits.webkit.org/244858@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 445951 [details].

[Radar WebKit Bug Importer]

<rdar://problem/86046194>