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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/108708/">http://git.reviewboard.kde.org/r/108708/</a>
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<p style="margin-top: 0;">On February 2nd, 2013, 9:44 p.m. UTC, <b>Boudewijn Rempt</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;">Yeah... If msvc warns about it, but I do think it's silly :-). Anyway, I still need to test, but I'm sure it's fine, it doesn't alter what we meant with the code.</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;">I was surprised as well, but really operator-() on an unsigned int only result in the 2-complement.
--- 8< ---
#include <iostream>
int main()
{
int a = 5;
unsigned int b = 5;
std::cout <<"int: "<< (-a)<<" uint: "<< (-b) << std::endl;
}
--- 8< ---
$ g++ test.cpp -o test
$ ./test
int: -5 uint: 4294967291
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<p>- Friedrich W. H.</p>
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<p>On February 2nd, 2013, 12:49 a.m. UTC, Friedrich W. H. Kossebau wrote:</p>
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<div>Review request for Calligra and Boudewijn Rempt.</div>
<div>By Friedrich W. H. Kossebau.</div>
<p style="color: grey;"><i>Updated Feb. 2, 2013, 12:49 a.m.</i></p>
<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;">MSVC hints in its warnings that using operator-() on an unsigned int will still result in an unsigned int.
Reading up the intertubes on that it seems to be usually the 2's complement of the value.
So all the rect calculations in these blur filter must have been giving strange results for quite some time.
Is that true? Nobody saw that?
Attached patch fixes that by always turning the values used for calculations into signed integer, by the implicit conversion coming with the assignment.
Other possible fixes would be to simply switch the operator-() usage into a -1* operation. Not sure what I prefer, your choice :)</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;">None, as I have no clue of the blur filters and how to see the effect of the patch. Left for Krita insiders.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>krita/plugins/filters/blur/kis_blur_filter.cpp <span style="color: grey">(b81f0bd)</span></li>
<li>krita/plugins/filters/blur/kis_gaussian_blur_filter.cpp <span style="color: grey">(0c68562)</span></li>
<li>krita/plugins/filters/blur/kis_motion_blur_filter.cpp <span style="color: grey">(6a13ca3)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/108708/diff/" style="margin-left: 3em;">View Diff</a></p>
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