[Bug 26432] New: Specify that filter regions clip input


            Bug ID: 26432
           Summary: Specify that filter regions clip input
           Product: CSS
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Filter Effects
          Assignee: dino@apple.com
          Reporter: mvujovic@adobe.com
        QA Contact: public-css-bugzilla@w3.org
                CC: cmarrin@apple.com, eoconnor@apple.com, smfr@me.com

Created attachment 1499
  --> https://www.w3.org/Bugs/Public/attachment.cgi?id=1499&action=edit

Currently, the spec says:
"The bounds of this rectangle [the filter region] act as a hard clipping region
for each filter primitive included with a given filter element; thus, if the
effect of a given filter primitive would extend beyond the bounds of the
rectangle (this sometimes happens when using a feGaussianBlur filter primitive
with a very large stdDeviation), parts of the effect will get clipped." [1]

I interpret this as the output of a filter is clipped to its filter region, and
nothing is said about clipping the input.

Currently, all UAs I've tested (Chrome, Firefox, IE, Safari) clip the input
SourceGraphic to the filter region (as I would expect). I think we should add
that to the spec.

I wrote a reftest and attached it.

[1]: http://dev.w3.org/fxtf/filters/#FilterRegionXYWidthHeightAttributes

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Received on Thursday, 24 July 2014 23:44:11 UTC