<?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>135018</bug_id>
          
          <creation_ts>2014-07-17 12:05:14 -0700</creation_ts>
          <short_desc>Sometimes purgeable (or empty!) tiles are shown on screen when resuming the app</short_desc>
          <delta_ts>2014-07-19 23:08:10 -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>WebKit2</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>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Tim Horton">thorton</reporter>
          <assigned_to name="Tim Horton">thorton</assigned_to>
          <cc>andersca</cc>
    
    <cc>benjamin</cc>
    
    <cc>mitz</cc>
    
    <cc>sam</cc>
    
    <cc>simon.fraser</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1023059</commentid>
    <comment_count>0</comment_count>
    <who name="Tim Horton">thorton</who>
    <bug_when>2014-07-17 12:05:14 -0700</bug_when>
    <thetext>Empty tiles show up as black.

To combat this, we&apos;ll make sure we immediately dispatch view state changes *from inside the resume notification* so that the UI process is blocked *before* removing the snapshot.

We&apos;ll also temporarily detach the RemoteLayerTreeHost root layer (it&apos;ll get reattached on the next commit) so that even if our waitForDidUpdateViewState times out (500 ms), we&apos;ll show white instead of black.

We could also make said timeout longer in the resume case, but that will be a different patch.

&lt;rdar://problem/17615038&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1023060</commentid>
    <comment_count>1</comment_count>
      <attachid>235082</attachid>
    <who name="Tim Horton">thorton</who>
    <bug_when>2014-07-17 12:10:24 -0700</bug_when>
    <thetext>Created attachment 235082
patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1023062</commentid>
    <comment_count>2</comment_count>
    <who name="Tim Horton">thorton</who>
    <bug_when>2014-07-17 12:20:18 -0700</bug_when>
    <thetext>http://trac.webkit.org/changeset/171191</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1023502</commentid>
    <comment_count>3</comment_count>
      <attachid>235082</attachid>
    <who name="Darin Adler">darin</who>
    <bug_when>2014-07-19 23:08:10 -0700</bug_when>
    <thetext>Comment on attachment 235082
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=235082&amp;action=review

&gt; Source/WebKit2/UIProcess/DrawingAreaProxy.h:91
&gt; +    virtual void hideContentUntilNextUpdate() { ASSERT_NOT_REACHED(); }

Doesn’t seem right.

If WKContentView knows that its drawing area is a RemoteLayerTreeDrawingAreaProxy, then it could be written to do a safe downcast and this function could be in that class instead of here in this base class.

If WKContentView doesn’t know that its drawing area is a RemoteLayerTreeDrawingAreaProxy, then we can’t ASSERT_NOT_REACHED.</thetext>
  </long_desc>
      
          <attachment
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            <attachid>235082</attachid>
            <date>2014-07-17 12:10:24 -0700</date>
            <delta_ts>2014-07-19 23:08:10 -0700</delta_ts>
            <desc>patch</desc>
            <filename>blacktiles.diff</filename>
            <type>text/plain</type>
            <size>7943</size>
            <attacher name="Tim Horton">thorton</attacher>
            
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<flag name="review"
          id="259626"
          type_id="1"
          status="+"
          setter="simon.fraser"
    />
          </attachment>
      

    </bug>

</bugzilla>