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<!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>118595</bug_id>
          
          <creation_ts>2013-07-12 04:33:52 -0700</creation_ts>
          <short_desc>[EFL][GTK][Qt] New test: fast/regions/autoheight-correct-region-for-lines-2.html fails after r152572.</short_desc>
          <delta_ts>2015-12-22 06:51:15 -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>Tools / Tests</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>
          <dependson>119273</dependson>
          <blocked>63344</blocked>
    
    <blocked>87008</blocked>
    
    <blocked>118531</blocked>
          <everconfirmed>1</everconfirmed>
          <reporter name="Gábor Ábrahám">abrhm</reporter>
          <assigned_to name="Javier Fernandez">jfernandez</assigned_to>
          <cc>abucur</cc>
    
    <cc>dino</cc>
    
    <cc>jfernandez</cc>
    
    <cc>kadam</cc>
    
    <cc>mcatanzaro</cc>
    
    <cc>mihnea</cc>
    
    <cc>mrobinson</cc>
    
    <cc>ossy</cc>
    
    <cc>rniwa</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>spena</cc>
    
    <cc>thorton</cc>
    
    <cc>WebkitBugTracker</cc>
    
    <cc>zan</cc>
    
    <cc>zarvai</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>907900</commentid>
    <comment_count>0</comment_count>
    <who name="Gábor Ábrahám">abrhm</who>
    <bug_when>2013-07-12 04:33:52 -0700</bug_when>
    <thetext>After r152572 new fast/regions/autoheight-correct-region-for-lines-2.html ref test fails on EFL, GTK and Qt ports.

Link to image diff: http://build.webkit.sed.hu/results/x86-64%20Linux%20Qt%20Release/r152572%20(52260)/fast/regions/autoheight-correct-region-for-lines-2-diffs.html

It looks like the problem is the same at all port.

Could you check it please?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>907937</commentid>
    <comment_count>1</comment_count>
    <who name="Gábor Ábrahám">abrhm</who>
    <bug_when>2013-07-12 06:36:27 -0700</bug_when>
    <thetext>Actual image: http://build.webkit.sed.hu/results/x86-64%20Linux%20Qt%20Release/r152572%20(52260)/fast/regions/autoheight-correct-region-for-lines-2-actual.png</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>907942</commentid>
    <comment_count>2</comment_count>
      <attachid>206538</attachid>
    <who name="Gábor Ábrahám">abrhm</who>
    <bug_when>2013-07-12 06:47:57 -0700</bug_when>
    <thetext>Created attachment 206538
The actual picture</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>907947</commentid>
    <comment_count>3</comment_count>
      <attachid>206541</attachid>
    <who name="Gábor Ábrahám">abrhm</who>
    <bug_when>2013-07-12 06:59:57 -0700</bug_when>
    <thetext>Created attachment 206541
Actual

I will skip this test on Qt now, and upload the actual picture here, finally.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>908331</commentid>
    <comment_count>4</comment_count>
    <who name="Andrei Bucur">abucur</who>
    <bug_when>2013-07-15 01:32:15 -0700</bug_when>
    <thetext>Thanks for the report, we&apos;ll take a look at it.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>908755</commentid>
    <comment_count>5</comment_count>
    <who name="Javier Fernandez">jfernandez</who>
    <bug_when>2013-07-16 02:13:18 -0700</bug_when>
    <thetext>I can work on this bug, if nobody tells me otherwise.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>912573</commentid>
    <comment_count>6</comment_count>
    <who name="Javier Fernandez">jfernandez</who>
    <bug_when>2013-07-29 11:32:45 -0700</bug_when>
    <thetext>After looking into this issue for a while, I&apos;ve found out that the issue is related to an arithmetic overflow when computing the logic height.

The maxHeight property is defined in the test as a huge value, which is handled as a Length instance based on a float type. 
 
I&apos;ve found out that the flag SATURATED_LAYOUT_ARITHMETIC is not enabled by default in the WebKitGtk+ port, so when calling to the LayoutUnit(float), it does not apply the clampTo&lt;float&gt; template function.

Just enabling the SATURATED_LAYOUT_ARITHMETIC flag makes the test to pass, at least for the WebkitGtk+ port, but I&apos;m still doing some further investigations to understand why this is happening, whether is a Region related issue or a more general issue,

Besides, I want to understand how the combination of both, SATURATED_LAYOUT_ARITHMETIC and SUBPIXEL_LAYOUT actually works and which cases each of them handle.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>913022</commentid>
    <comment_count>7</comment_count>
    <who name="Javier Fernandez">jfernandez</who>
    <bug_when>2013-07-30 14:25:19 -0700</bug_when>
    <thetext>This is clearly a bug not related to Regions at all, since the actual issue was reported in the bug #119273. A simple fix would be just to set a lower value for the max-height property (like 20000000px, big enough, I would say). 

Of course it&apos;s also possible to wait for the bug #119273 fix, but notice that the max-height value has noting to do with the purpose of the test, besides allowing the region to adjust its auto-height properly.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>925143</commentid>
    <comment_count>8</comment_count>
      <attachid>210642</attachid>
    <who name="Javier Fernandez">jfernandez</who>
    <bug_when>2013-09-05 11:51:51 -0700</bug_when>
    <thetext>Created attachment 210642
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>926821</commentid>
    <comment_count>9</comment_count>
      <attachid>210642</attachid>
    <who name="Ryosuke Niwa">rniwa</who>
    <bug_when>2013-09-09 11:50:51 -0700</bug_when>
    <thetext>Comment on attachment 210642
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=210642&amp;action=review

&gt; LayoutTests/fast/regions/autoheight-correct-region-for-lines-2.html:20
&gt; -        max-height: 2000000000px;
&gt; +        max-height: 20000000px;

I&apos;m not sure if it&apos;s such a good idea to workaround this bug in the test.
This test was valuable in that it caught one case in which enabling subpixel layout without saturated arithmetic would result in a bug.
Do we have a test in LayoutTests/fast/sub-pixel that catches the same bug?  If not, please add one if you decide to &quot;fix&quot; the test.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>927213</commentid>
    <comment_count>10</comment_count>
    <who name="Javier Fernandez">jfernandez</who>
    <bug_when>2013-09-10 01:13:37 -0700</bug_when>
    <thetext>(In reply to comment #9)
&gt; (From update of attachment 210642 [details])
&gt; View in context: https://bugs.webkit.org/attachment.cgi?id=210642&amp;action=review
&gt; 
&gt; &gt; LayoutTests/fast/regions/autoheight-correct-region-for-lines-2.html:20
&gt; &gt; -        max-height: 2000000000px;
&gt; &gt; +        max-height: 20000000px;
&gt; 
&gt; I&apos;m not sure if it&apos;s such a good idea to workaround this bug in the test.
&gt; This test was valuable in that it caught one case in which enabling subpixel layout without saturated arithmetic would result in a bug.
&gt; Do we have a test in LayoutTests/fast/sub-pixel that catches the same bug?  If not, please add one if you decide to &quot;fix&quot; the test.

I share the concerns as well, but on the other hand, that was not the purpose of the tests. I&apos;ve filed a new one specifically for this issue at bug #119273, which also provides the corresponding test. 

My idea would be to close this bug and track the arithmetic overflow issue in the specific bug. Besides, the fix for bug #119273 would imply, as discussed in the mailing list, merging the 2 flags so that SATURATED_LAYOUT_ARITHMETIC would be enabled whenever SUBPIXEL_LAYOUT is. 

Anyway, I&apos;ve been talking about this with Mihnea Ovidenie so perhaps we should wait to get some feedback from him. Also, we could wait until bug #119273 is fixed to take the final decision.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>927356</commentid>
    <comment_count>11</comment_count>
    <who name="Ryosuke Niwa">rniwa</who>
    <bug_when>2013-09-10 09:58:50 -0700</bug_when>
    <thetext>I&apos;m simply concerned about losing the test coverage even for temporarily.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>975952</commentid>
    <comment_count>12</comment_count>
    <who name="Javier Fernandez">jfernandez</who>
    <bug_when>2014-02-03 12:00:07 -0800</bug_when>
    <thetext>This bug should be fixed now, at least in the WebKitGtk+ port, now that the SATURATED_LAYOUT_ARITHMETIC is enabled (bug 119273).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1150880</commentid>
    <comment_count>13</comment_count>
      <attachid>210642</attachid>
    <who name="Michael Catanzaro">mcatanzaro</who>
    <bug_when>2015-12-22 06:50:59 -0800</bug_when>
    <thetext>Comment on attachment 210642
Patch

We no longer have failure expectations for this bug, so I guess it is obsolete.</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
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            <attachid>206538</attachid>
            <date>2013-07-12 06:47:57 -0700</date>
            <delta_ts>2013-07-12 06:47:57 -0700</delta_ts>
            <desc>The actual picture</desc>
            <filename>url.txt</filename>
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            <attacher name="Gábor Ábrahám">abrhm</attacher>
            
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            <attachid>206541</attachid>
            <date>2013-07-12 06:59:57 -0700</date>
            <delta_ts>2013-07-12 06:59:57 -0700</delta_ts>
            <desc>Actual</desc>
            <filename>autoheight-correct-region-for-lines-2-actual.png</filename>
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            <attacher name="Gábor Ábrahám">abrhm</attacher>
            
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>210642</attachid>
            <date>2013-09-05 11:51:51 -0700</date>
            <delta_ts>2015-12-22 06:50:59 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-118595-20130905205147.patch</filename>
            <type>text/plain</type>
            <size>3334</size>
            <attacher name="Javier Fernandez">jfernandez</attacher>
            
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    </bug>

</bugzilla>