[Webkit-unassigned] [Bug 26380] New: SVG Filters and big sized filterRegions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=26380

           Summary: SVG Filters and big sized filterRegions
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: krit at webkit.org
                CC: eric at webkit.org, zimmermann at kde.org


We need to take care about very big filterRegions and itemSizes of filters. CI
has problems with very big image size.
We could clip the filterRegion after a defined maximum size and don't support
bigger filters.

Perhaps we can try to scale down the GraphicsContext and limit the size of all
ImageBuffers for source input / filter effects. We could transform the
filterRegion and itemsize too. But we will see every pixel. The size of every
pixel gets bigger on bigger sized filters.
Or we give the CTM of the scaling to every filter effect and transform the
context of every filter effect. But many filter effects need pixel
manipulation. Don't know if that is a possible way.

Another way is maybe to just draw the visible area. But I don't have experience
with that. And what to do on zooming out of the SVG?


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