https://issues.apache.org/bugzilla/show_bug.cgi?id=46721
Summary: Bug in SVGFeOffsetElementBridge when using
primitiveUnits="objectBoundingBox" -- Wrong Translation
Product: Batik
Version: 1.8
Platform: PC
OS/Version: Windows Vista
Status: NEW
Severity: major
Priority: P2
Component: GVT Filters
AssignedTo: [email protected]
ReportedBy: [email protected]
Hello,
Line 106 of SVGFeOffsetElementBridge states:
float dx = convertNumber(filterElement, SVG_DX_ATTRIBUTE, 0, ctx);
float dy = convertNumber(filterElement, SVG_DY_ATTRIBUTE, 0, ctx);
> AffineTransform at = AffineTransform.getTranslateInstance(dx, dy);
However, this sets an offset filter in userSpace coordinates, not in
objectBoundingBox units.
The translation should take into account the object bounding box (as required
by spec http://www.w3.org/TR/SVG/filters.html#feOffsetElement),
which is available in
filteredElement.geometryBounds
in this method.
I suggest in case of objectBoundingBox units to rather set:
> AffineTransform at = AffineTransform.getTranslateInstance(
dx * filteredElement.geometryBounds.getWidth() ,
dy * filteredElement.geometryBounds.getHeight() );
Being new to Batik, I don't master all the implications, so decide what's best!
Congrats for Batik, this great piece of work!
-----------------------------------------
Test case:
Apply the following filter to any <svg>
<defs>
<filter id="CenteringFilter" filterUnits="objectBoundingBox"
primitiveUnits="objectBoundingBox" x="-0.5" y="-0.5" width="1.5" height="1.5">
<feOffset in="SourceGraphic" dx="-0.5" dy="-0.5" /> <!-- FIXME
dx & dy !!! -->
</filter>
</defs>
-----------------------------------------
Note: this works fine with Adove Viewer but not with Batik.
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