<table><tr><td style="">yurchor added a comment.
</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/D19542">View Revision</a></tr></table><br /><div><div><blockquote style="border-left: 3px solid #8C98B8;
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<div style="font-style: normal;
padding-bottom: 4px;">In <a href="https://phabricator.kde.org/D19542#425698" style="background-color: #e7e7e7;
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color: rgb(107, 116, 140);"><p>Erm, my Okular 1.6.2 already does this, just with another threshold. Below value() = 129, the text (and the header) become white, above value() = 128, they become black.</p>
<p>While searching for the code, I just found ui/drawingtoolactions.cpp:48, which does something similar:</p>
<div class="remarkup-code-block" style="margin: 12px 0;" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code" style="font: 11px/15px "Menlo", "Consolas", "Monaco", monospace; padding: 12px; margin: 0; background: rgba(71, 87, 120, 0.08);"> // draw check mark
const int lightness = ((color.red() * 299) + (color.green() * 587) + (color.blue() * 114)) / 1000;
p.setPen( lightness < 128 ? Qt::white : Qt::black );
p.drawText( QRect( QPoint( 0, 0 ), pmSel.size() ), Qt::AlignCenter, QStringLiteral("\u2713") );</pre></div>
<p>Is it possible that Qt automatically sets the text color based on the background color, when the text color is not explicitely given?</p></div>
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<p>Do you mean that the attached test case (text.pdf) works for you (the text in annotation window for the right blue pop-up note is visible)?</p>
<p>That's what I have for the git/master:<br />
<a href="https://phabricator.kde.org/F6662406" style="background-color: #e7e7e7;
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