<table><tr><td style="">romangg added inline comments.
</td><a style="text-decoration: none; padding: 4px 8px; margin: 0 8px 8px; float: right; color: #464C5C; font-weight: bold; border-radius: 3px; background-color: #F7F7F9; background-image: linear-gradient(to bottom,#fff,#f1f0f1); display: inline-block; border: 1px solid rgba(71,87,120,.2);" href="https://phabricator.kde.org/D26172">View Revision</a></tr></table><br /><div><strong>INLINE COMMENTS</strong><div><div style="margin: 6px 0 12px 0;"><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D26172#inline-147338">View Inline</a><span style="color: #4b4d51; font-weight: bold;">davidedmundson</span> wrote in <span style="color: #4b4d51; font-weight: bold;">scene_qpainter.cpp:294</span></div>
<div style="margin: 8px 0; padding: 0 12px; color: #74777D;"><p style="padding: 0; margin: 8px;">This will crash on X and internal clients.</p></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">QPainter compositing is Wayland only and for internal clients <tt style="background: #ebebeb; font-size: 13px;">Toplevel::isClient()</tt> returns false.</p>
<p style="padding: 0; margin: 8px;">The only danger to crash could come from an XWayland window without a surface but with damage. If I remember the XWayland code correctly this can't happen though. Damage is always sent through the surface</p>
<p style="padding: 0; margin: 8px;">We can add a guard of course but since QPainter backend is more our "experimentation field" than our workhorse I would go without precautionary guards. I can add a comment to the code though to explain the rational.</p></div></div><br /><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D26172#inline-147357">View Inline</a><span style="color: #4b4d51; font-weight: bold;">davidedmundson</span> wrote in <span style="color: #4b4d51; font-weight: bold;">scene_qpainter.cpp:308</span></div>
<div style="margin: 8px 0; padding: 0 12px; color: #74777D;"><p style="padding: 0; margin: 8px;">In the GL case you implement a crop if we have a sourceRect with a position and an invalid size</p></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">In case the source rect is of invalid size there might still be a destination size being specified. That means there is still a difference between vertex positions and texture coordinates what both need to be set correctly in the GL case.</p>
<p style="padding: 0; margin: 8px;">In QPainter we don't deal with texture coordinates so it simplifies to only painting from the image to the buffer geometry.</p></div></div></div></div></div><br /><div><strong>REPOSITORY</strong><div><div>R108 KWin</div></div></div><br /><div><strong>REVISION DETAIL</strong><div><a href="https://phabricator.kde.org/D26172">https://phabricator.kde.org/D26172</a></div></div><br /><div><strong>To: </strong>romangg, KWin, davidedmundson<br /><strong>Cc: </strong>davidedmundson, kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart<br /></div>