<?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>68777</bug_id>
          
          <creation_ts>2011-09-25 11:44:58 -0700</creation_ts>
          <short_desc>Absolute child is not repainted when parent opacity changes</short_desc>
          <delta_ts>2011-11-18 17:40:39 -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>Layout and Rendering</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>All</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>HasReduction</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          <dependson>72779</dependson>
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Philip Rogers">pdr</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>darin</cc>
    
    <cc>davidbarr</cc>
    
    <cc>jchaffraix</cc>
    
    <cc>knorton</cc>
    
    <cc>pdr</cc>
    
    <cc>scheglov</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>webkit.review.bot</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>472894</commentid>
    <comment_count>0</comment_count>
      <attachid>108608</attachid>
    <who name="Philip Rogers">pdr</who>
    <bug_when>2011-09-25 11:44:58 -0700</bug_when>
    <thetext>Created attachment 108608
Repro case showing incorrect child repaint

Changing the opacity of a parent should trigger a repaint on all children but absolutely positioned children are not repainted correctly. Instead of repainting the entire child, only the parts of the child that are in the parent&apos;s bounding box are repainted (see attached repro).

Tested on WebKit nightly @r95921/Mac, Chrome 16.0.889.0/Mac, and Chrome 14.0.835.186/Linux

As a workaround users can force a repaint by setting opacity=0.999 on the child.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>474410</commentid>
    <comment_count>1</comment_count>
    <who name="Julien Chaffraix">jchaffraix</who>
    <bug_when>2011-09-27 18:00:13 -0700</bug_when>
    <thetext>I couldn&apos;t reproduce it on the latest WebKit nightly (96162) but I could see it on ToT Qt and Chromium Canary build.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>474726</commentid>
    <comment_count>2</comment_count>
    <who name="Philip Rogers">pdr</who>
    <bug_when>2011-09-28 07:27:12 -0700</bug_when>
    <thetext>(In reply to comment #1)
&gt; I couldn&apos;t reproduce it on the latest WebKit nightly (96162) but I could see it on ToT Qt and Chromium Canary build.

I am still able to repro it on WebKit nightly @r96196 on Mac OSX 1.6.8.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>485284</commentid>
    <comment_count>3</comment_count>
    <who name="Konstantin Shcheglov">scheglov</who>
    <bug_when>2011-10-17 10:59:01 -0700</bug_when>
    <thetext>I can reproduce this with Chromium, with USE(ACCELERATED_COMPOSITING).

Trick is that first change of opacity is not propagated to children.
Problem is in order of style[Will/Did]Change and diff calculation in RenderObject::setStyle().

1. Before styleWillChange().
RenderObject::adjustStyleDifference() correctly determines that diff=StyleDifferenceRepaintLayer. However at this point there are no layer (i.e. !hasLayer()). So, diff=StyleDifferenceRepaint used instead.

2. In styleWillChange().
RenderBoxModelObject::styleWillChange() for parent, sees diff=StyleDifferenceRepaint and calls repaint(). In contrast, second time, there is already layer, so layer()-&gt;repaintIncludingDescendants() is used.

3. In styleDidChange().
New RenderLayer is created for parent (and child layer moved to this new layer). So, now parent has layer.

4. After styleDidChange().
RenderObject::adjustStyleDifference() is called again, with all layers ready, so now diff=StyleDifferenceRepaintLayer. But this diff handled as just StyleDifferenceRepaint (at very end of RenderObject::setStyle()) and causes just repaint(), i.e. again not enough to repaint child (its layer).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>485414</commentid>
    <comment_count>4</comment_count>
      <attachid>111304</attachid>
    <who name="Konstantin Shcheglov">scheglov</who>
    <bug_when>2011-10-17 12:58:13 -0700</bug_when>
    <thetext>Created attachment 111304
Handle StyleDifferenceRepaintLayer at the end of setStyle()</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>485415</commentid>
    <comment_count>5</comment_count>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2011-10-17 13:00:37 -0700</bug_when>
    <thetext>Attachment 111304 did not pass style-queue:

Failed to run &quot;[&apos;Tools/Scripts/update-webkit&apos;, &apos;--chromium&apos;]&quot; exit_code: 2

Updating OpenSource
From git://git.webkit.org/WebKit
   a24babb..abfc01f  master     -&gt; origin/master
	M	Source/WebCore/dom/Element.cpp
	M	Source/WebCore/ChangeLog
	M	Source/WebCore/rendering/svg/RenderSVGResource.cpp
	M	Source/WebCore/rendering/style/StyleRareNonInheritedData.h
	M	Source/WebCore/rendering/style/StyleInheritedData.cpp
	M	Source/WebCore/rendering/style/StyleRareInheritedData.cpp
	M	Source/WebCore/rendering/style/StyleMultiColData.h
	M	Source/WebCore/rendering/style/StyleRareNonInheritedData.cpp
	M	Source/WebCore/rendering/style/SVGRenderStyleDefs.cpp
	M	Source/WebCore/rendering/style/StyleInheritedData.h
	M	Source/WebCore/rendering/style/RenderStyle.cpp
	M	Source/WebCore/rendering/style/StyleMultiColData.cpp
	M	Source/WebCore/rendering/style/StyleRareInheritedData.h
	M	Source/WebCore/rendering/style/SVGRenderStyle.h
	M	Source/WebCore/rendering/style/SVGRenderStyleDefs.h
	M	Source/WebCore/rendering/style/RenderStyleConstants.h
	M	Source/WebCore/rendering/style/RenderStyle.h
	M	Source/WebCore/css/CSSStyleSelector.cpp
	M	Source/WebCore/css/CSSStyleSelector.h
	M	Source/WebCore/css/SVGCSSStyleSelector.cpp
	M	Source/WebCore/css/CSSStyleApplyProperty.cpp
r97638 = abfc01f879080fed6c628f7a9ab659c8d234a4b2 (refs/remotes/trunk)
First, rewinding head to replay your work on top of it...
Fast-forwarded master to refs/remotes/trunk.
Updating chromium port dependencies using gclient...
Error: Can&apos;t switch the checkout to http://v8.googlecode.com/svn/branches/3.6@9637; UUID don&apos;t match and there is local changes in /mnt/git/webkit-style-queue/Source/WebKit/chromium/v8. Delete the directory and try again.
Re-trying &apos;depot_tools/gclient sync&apos;
Error: Can&apos;t switch the checkout to http://v8.googlecode.com/svn/branches/3.6@9637; UUID don&apos;t match and there is local changes in /mnt/git/webkit-style-queue/Source/WebKit/chromium/v8. Delete the directory and try again.
Re-trying &apos;depot_tools/gclient sync&apos;
Error: Can&apos;t switch the checkout to http://v8.googlecode.com/svn/branches/3.6@9637; UUID don&apos;t match and there is local changes in /mnt/git/webkit-style-queue/Source/WebKit/chromium/v8. Delete the directory and try again.
Error: &apos;depot_tools/gclient sync&apos; failed 3 tries and returned 256 at Tools/Scripts/update-webkit-chromium line 107.
Re-trying &apos;depot_tools/gclient sync&apos;
No such file or directory at Tools/Scripts/update-webkit line 104.


If any of these errors are false positives, please file a bug against check-webkit-style.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>486121</commentid>
    <comment_count>6</comment_count>
      <attachid>111458</attachid>
    <who name="Konstantin Shcheglov">scheglov</who>
    <bug_when>2011-10-18 10:00:22 -0700</bug_when>
    <thetext>Created attachment 111458
Handle StyleDifferenceRepaintLayer at the end of setStyle()</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>505222</commentid>
    <comment_count>7</comment_count>
    <who name="David Barr">davidbarr</who>
    <bug_when>2011-11-17 14:30:57 -0800</bug_when>
    <thetext>Looks good to me, maybe Darin or Simon would like to review?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>505307</commentid>
    <comment_count>8</comment_count>
      <attachid>111458</attachid>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2011-11-17 15:53:35 -0800</bug_when>
    <thetext>Comment on attachment 111458
Handle StyleDifferenceRepaintLayer at the end of setStyle()

Clearing flags on attachment: 111458

Committed r100693: &lt;http://trac.webkit.org/changeset/100693&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>505308</commentid>
    <comment_count>9</comment_count>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2011-11-17 15:53:40 -0800</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>506197</commentid>
    <comment_count>10</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2011-11-18 16:32:20 -0800</bug_when>
    <thetext>This caused bug 72770.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>506200</commentid>
    <comment_count>11</comment_count>
    <who name="David Barr">davidbarr</who>
    <bug_when>2011-11-18 16:35:31 -0800</bug_when>
    <thetext>(In reply to comment #10)
&gt; This caused bug 72770.

:( My LGTM is not yet sufficient.
I guess we were both caught out - such an innocent looking patch.</thetext>
  </long_desc>
      
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            <attachid>108608</attachid>
            <date>2011-09-25 11:44:58 -0700</date>
            <delta_ts>2011-09-25 11:44:58 -0700</delta_ts>
            <desc>Repro case showing incorrect child repaint</desc>
            <filename>repaintRepro.html</filename>
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            <size>958</size>
            <attacher name="Philip Rogers">pdr</attacher>
            
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            <attachid>111304</attachid>
            <date>2011-10-17 12:58:13 -0700</date>
            <delta_ts>2011-10-18 10:00:22 -0700</delta_ts>
            <desc>Handle StyleDifferenceRepaintLayer at the end of setStyle()</desc>
            <filename>68777_1.diff</filename>
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            <attacher name="Konstantin Shcheglov">scheglov</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>