<?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>113238</bug_id>
          
          <creation_ts>2013-03-25 13:38:06 -0700</creation_ts>
          <short_desc>Non-paintsContent fixed position layer should not cause main-thread scrolling</short_desc>
          <delta_ts>2013-03-26 15:32:39 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Layout and Rendering</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <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="Xianzhu Wang">wangxianzhu</reporter>
          <assigned_to name="Xianzhu Wang">wangxianzhu</assigned_to>
          <cc>eric</cc>
    
    <cc>esprehn+autocc</cc>
    
    <cc>jamesr</cc>
    
    <cc>ojan.autocc</cc>
    
    <cc>shawnsingh</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>skyostil</cc>
    
    <cc>webkit.review.bot</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>863023</commentid>
    <comment_count>0</comment_count>
    <who name="Xianzhu Wang">wangxianzhu</who>
    <bug_when>2013-03-25 13:38:06 -0700</bug_when>
    <thetext>Should record the reason of not-compositing non-paintsContent fixed position layer so that ScrollingCoordinator won&apos;t treat the layer as a fast-scrolling blocker.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>863165</commentid>
    <comment_count>1</comment_count>
      <attachid>194946</attachid>
    <who name="Xianzhu Wang">wangxianzhu</who>
    <bug_when>2013-03-25 16:43:20 -0700</bug_when>
    <thetext>Created attachment 194946
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>863540</commentid>
    <comment_count>2</comment_count>
    <who name="Sami Kyöstilä">skyostil</who>
    <bug_when>2013-03-26 04:16:32 -0700</bug_when>
    <thetext>Thanks Xianzhu, I think this looks great.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>863898</commentid>
    <comment_count>3</comment_count>
    <who name="Xianzhu Wang">wangxianzhu</who>
    <bug_when>2013-03-26 12:09:45 -0700</bug_when>
    <thetext>Simon, could you please review the patch? Thanks.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>863919</commentid>
    <comment_count>4</comment_count>
      <attachid>194946</attachid>
    <who name="James Robinson">jamesr</who>
    <bug_when>2013-03-26 12:30:56 -0700</bug_when>
    <thetext>Comment on attachment 194946
Patch

R=me, this looks great.  See if you can get Simon to take a look as well before landing.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>863998</commentid>
    <comment_count>5</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2013-03-26 14:24:09 -0700</bug_when>
    <thetext>I think bug 110430 covers the same issue.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864029</commentid>
    <comment_count>6</comment_count>
      <attachid>194946</attachid>
    <who name="Xianzhu Wang">wangxianzhu</who>
    <bug_when>2013-03-26 14:53:44 -0700</bug_when>
    <thetext>Comment on attachment 194946
Patch

Assuming no objection from Simon :)</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864046</commentid>
    <comment_count>7</comment_count>
      <attachid>194946</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2013-03-26 15:11:15 -0700</bug_when>
    <thetext>Comment on attachment 194946
Patch

Where is NotCompositedForNoVisibleContent actually consulted? I would expect to see a test for it in FrameView::scrollContentsFastPath(), but do not.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864049</commentid>
    <comment_count>8</comment_count>
      <attachid>194946</attachid>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2013-03-26 15:14:31 -0700</bug_when>
    <thetext>Comment on attachment 194946
Patch

Clearing flags on attachment: 194946

Committed r146940: &lt;http://trac.webkit.org/changeset/146940&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864050</commentid>
    <comment_count>9</comment_count>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2013-03-26 15:14:34 -0700</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864053</commentid>
    <comment_count>10</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2013-03-26 15:16:54 -0700</bug_when>
    <thetext>Please respond to my comment.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864057</commentid>
    <comment_count>11</comment_count>
    <who name="Xianzhu Wang">wangxianzhu</who>
    <bug_when>2013-03-26 15:24:49 -0700</bug_when>
    <thetext>(In reply to comment #7)
&gt; (From update of attachment 194946 [details])
&gt; Where is NotCompositedForNoVisibleContent actually consulted? I would expect to see a test for it in FrameView::scrollContentsFastPath(), but do not.

In ScrollingCoordinator::hasVisibleSlowRepaintViewportConstrainedObjects(), there is an existing test that any viewport constrained object not composited with explicit reasons (layer-&gt;viewportConstrainedNotCompositedReason() != RenderLayer::NoNotCompositedReason) won&apos;t cause main-thread scrolling.

Seems that we need the same test in FrameView::scrollContentsFastPath().</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>864061</commentid>
    <comment_count>12</comment_count>
    <who name="Xianzhu Wang">wangxianzhu</who>
    <bug_when>2013-03-26 15:32:39 -0700</bug_when>
    <thetext>(In reply to comment #11)
&gt; (In reply to comment #7)
&gt; &gt; (From update of attachment 194946 [details] [details])
&gt; &gt; Where is NotCompositedForNoVisibleContent actually consulted? I would expect to see a test for it in FrameView::scrollContentsFastPath(), but do not.
&gt; 
&gt; In ScrollingCoordinator::hasVisibleSlowRepaintViewportConstrainedObjects(), there is an existing test that any viewport constrained object not composited with explicit reasons (layer-&gt;viewportConstrainedNotCompositedReason() != RenderLayer::NoNotCompositedReason) won&apos;t cause main-thread scrolling.
&gt; 
&gt; Seems that we need the same test in FrameView::scrollContentsFastPath().

This seems what bug 110430 covers. This bug covers the main-thread scrolling issue caused by no-content fixed element. I should have used &quot;main-thread scrolling&quot; instead of ambiguous &quot;slow-scrolling&quot;/&quot;fast-scrolling&quot;. Will work on bug 110430 for the remaining issue in FrameView::scrollContentsFastPath().</thetext>
  </long_desc>
      
          <attachment
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              isprivate="0"
          >
            <attachid>194946</attachid>
            <date>2013-03-25 16:43:20 -0700</date>
            <delta_ts>2013-03-26 15:14:31 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-113238-20130325163904.patch</filename>
            <type>text/plain</type>
            <size>8635</size>
            <attacher name="Xianzhu Wang">wangxianzhu</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>