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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/125313/">https://git.reviewboard.kde.org/r/125313/</a>
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<p style="margin-top: 0;">On October 14th, 2015, 10:20 p.m. UTC, <b>Albert Astals Cid</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">If you don't decreade the opacity of the original image it is not a fade though, is it?</p></pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I'd say fade transition between a pixel with value A and a pixel with value B (value being either of the color components) is C(t) = A * (1-t/T) + B * t/T, where T is the transition duration.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Which is what one gets from a pixel with value B and opacity t/T on top of a pixel with value A and opacity 1, according to color compositing formulas (found for example <a href="https://www.cs.princeton.edu/courses/archive/fall00/cs426/papers/smith95a.pdf" style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">here</a> or <a href="https://en.wikipedia.org/wiki/Alpha_compositing#Description" style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">here</a>).</p></pre>
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<p>- Arseniy</p>
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<p>On September 27th, 2015, 7:38 p.m. UTC, Arseniy Lartsev wrote:</p>
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<div>Review request for Okular.</div>
<div>By Arseniy Lartsev.</div>
<p style="color: grey;"><i>Updated Sept. 27, 2015, 7:38 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=352877">352877</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
okular
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Right in the middle of the fade transition, the previous and the next slide are painted each with 50% opacity on top of black background. This means that the black background will be slightly visible through the slides, which it shouldn't be. I propose a patch to fix this.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Works for me.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>ui/presentationwidget.cpp <span style="color: grey">(0d9a55d)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/125313/diff/" style="margin-left: 3em;">View Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">File Attachments </h1>
<li><a href="https://git.reviewboard.kde.org/media/uploaded/files/2015/09/27/7df41157-5884-4a29-b3ea-f3590b7bf831__blank_transition.pdf">Test case (two blank pages, 0.5s long fade transition)</a></li>
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