<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>84610</bug_id>
          
          <creation_ts>2012-04-23 10:28:00 -0700</creation_ts>
          <short_desc>SVG feConvolveMatrix does not implement kernelUnitLength</short_desc>
          <delta_ts>2025-12-26 19:26:08 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>SVG</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>NEW</bug_status>
          <resolution></resolution>
          
          <see_also>https://bugs.webkit.org/show_bug.cgi?id=247799</see_also>
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Stephen Chenney">schenney</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>ahmad.saleem792</cc>
    
    <cc>ap</cc>
    
    <cc>bfulgham</cc>
    
    <cc>krit</cc>
    
    <cc>mmaxfield</cc>
    
    <cc>rniwa</cc>
    
    <cc>sabouhallawa</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>zimmermann</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>607802</commentid>
    <comment_count>0</comment_count>
    <who name="Stephen Chenney">schenney</who>
    <bug_when>2012-04-23 10:28:00 -0700</bug_when>
    <thetext>The code in FEConvolveMatrix::platformApply does not make any use of the kernelUnitLength property on the filter. Code search did turn up any usage anywhere. I conclude that we have not implemented it.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>607808</commentid>
    <comment_count>1</comment_count>
    <who name="Dirk Schulze">krit</who>
    <bug_when>2012-04-23 10:30:20 -0700</bug_when>
    <thetext>(In reply to comment #0)
&gt; The code in FEConvolveMatrix::platformApply does not make any use of the kernelUnitLength property on the filter. Code search did turn up any usage anywhere. I conclude that we have not implemented it.

That is correct. I think the current spec is a bit vague on how it should work. At least it was not clear to me how we could implement at the time I worked on SVG filters.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1883619</commentid>
    <comment_count>2</comment_count>
    <who name="Ahmad Saleem">ahmad.saleem792</who>
    <bug_when>2022-07-14 08:54:58 -0700</bug_when>
    <thetext>I can see now references to &quot;kernelUnitLength&quot;:

https://github.com/WebKit/WebKit/blob/717edcf5882531d38e55c9cd7929667af2b319a8/Source/WebCore/platform/graphics/filters/FEConvolveMatrix.cpp#L34

https://github.com/WebKit/WebKit/blob/717edcf5882531d38e55c9cd7929667af2b319a8/Source/WebCore/platform/graphics/filters/FEConvolveMatrix.h#L41

Is it now implemented? If yes, can this bug be closed? Thanks!</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1883702</commentid>
    <comment_count>3</comment_count>
    <who name="Ryosuke Niwa">rniwa</who>
    <bug_when>2022-07-14 11:57:36 -0700</bug_when>
    <thetext>Said? Is this now implemented?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1883717</commentid>
    <comment_count>4</comment_count>
    <who name="Said Abou-Hallawa">sabouhallawa</who>
    <bug_when>2022-07-14 12:45:13 -0700</bug_when>
    <thetext>No it is not implemented. See FEConvolveMatrixSoftwareApplier::apply() and notice that m_effect.kernelUnitLength() is not used.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1883719</commentid>
    <comment_count>5</comment_count>
      <attachid>460900</attachid>
    <who name="Said Abou-Hallawa">sabouhallawa</who>
    <bug_when>2022-07-14 12:46:19 -0700</bug_when>
    <thetext>Created attachment 460900
smiley.jpeg</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1883721</commentid>
    <comment_count>6</comment_count>
      <attachid>460901</attachid>
    <who name="Said Abou-Hallawa">sabouhallawa</who>
    <bug_when>2022-07-14 12:48:21 -0700</bug_when>
    <thetext>Created attachment 460901
test case

Two different filters are applied to the two images. FireFox is the only browser that renders the second image correctly.</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="0"
              isprivate="0"
          >
            <attachid>460900</attachid>
            <date>2022-07-14 12:46:19 -0700</date>
            <delta_ts>2022-07-14 12:46:19 -0700</delta_ts>
            <desc>smiley.jpeg</desc>
            <filename>smiley.jpeg</filename>
            <type>image/jpeg</type>
            <size>6405</size>
            <attacher name="Said Abou-Hallawa">sabouhallawa</attacher>
            
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="0"
              isprivate="0"
          >
            <attachid>460901</attachid>
            <date>2022-07-14 12:48:21 -0700</date>
            <delta_ts>2022-07-14 12:48:21 -0700</delta_ts>
            <desc>test case</desc>
            <filename>test-feConvolveMatrix.html</filename>
            <type>text/html</type>
            <size>5604</size>
            <attacher name="Said Abou-Hallawa">sabouhallawa</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>