'[cairo-bugs] [Bug 84330] New: record-paint-alpha-clip-mask.xcb.rgb24 random failure'

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List:       cairo-bugs
Subject:    [cairo-bugs] [Bug 84330] New: record-paint-alpha-clip-mask.xcb.rgb24 random failure
From:       bugzilla-daemon () freedesktop ! org
Date:       2014-09-25 15:47:14
Message-ID: bug-84330-4039 () http ! bugs ! freedesktop ! org/
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Date: Thu, 25 Sep 2014 15:47:17 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=84330

          Priority: medium
            Bug ID: 84330
          Assignee: psychon@znc.in
           Summary: record-paint-alpha-clip-mask.xcb.rgb24 random failure
        QA Contact: cairo-bugs@cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: sixtysix@inwind.it
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: xcb backend
           Product: cairo

Created attachment 106861
  --> https://bugs.freedesktop.org/attachment.cgi?id=106861&action=edit
quick hack

In this test there are a number of cairo_paint_with_alpha calls
with a clip composed of two non intersecting paths. In these cases
_composite_mask_clip (from src/cairo-xcb-surface-render.c lines 3458)
is executed and this function assumes that it is possible to avoid
a deferred clear. But this test shows that is not always possible,
in fact clearing the surface when info.traps.num_traps == 0, fixes
the test for the targets xcb.argb32 and xcb{,-window{,&}}.rgb24

Not clearing a surface leaves it in a status that is possibly clear and
that's the reason of the occasional failures.

-- 
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Date: Thu, 25 Sep 2014 15:47:17 +0000
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<html>
    <head>
      <base href="https://bugs.freedesktop.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - record-paint-alpha-clip-mask.xcb.rgb24 random failure"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=84330">84330</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>psychon&#64;znc.in
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>record-paint-alpha-clip-mask.xcb.rgb24 random failure
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>cairo-bugs&#64;cairographics.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>sixtysix&#64;inwind.it
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>xcb backend
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>cairo
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=106861" \
name="attach_106861" title="quick hack">attachment 106861</a> <a \
href="attachment.cgi?id=106861&amp;action=edit" title="quick \
hack">[details]</a></span> quick hack

In this test there are a number of cairo_paint_with_alpha calls
with a clip composed of two non intersecting paths. In these cases
_composite_mask_clip (from src/cairo-xcb-surface-render.c lines 3458)
is executed and this function assumes that it is possible to avoid
a deferred clear. But this test shows that is not always possible,
in fact clearing the surface when info.traps.num_traps == 0, fixes
the test for the targets xcb.argb32 and xcb{,-window{,&amp;}}.rgb24

Not clearing a surface leaves it in a status that is possibly clear and
that's the reason of the occasional failures.</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are the QA Contact for the bug.</li>
      </ul>
    </body>
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--1411660037.F70717.9227--

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