Review Request 108708: fix possibly broken rect size calculation in Krita blur filters

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This review has been submitted with commit 64408ec4e912432f1dae46858c6e269ac7283a1d by Friedrich W. H. Kossebau to branch master.

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On Feb. 2, 2013, 12:49 a.m., Friedrich W. H. Kossebau wrote:
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> (Updated Feb. 2, 2013, 12:49 a.m.)
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> Review request for Calligra and Boudewijn Rempt.
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> Description
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> 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.
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> Is that true? Nobody saw that?
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> Attached patch fixes that by always turning the values used for calculations into signed integer, by the implicit conversion coming with the assignment.
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> Other possible fixes would be to simply switch the operator-() usage into a -1* operation. Not sure what I prefer, your choice :)
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> Diffs
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>   krita/plugins/filters/blur/kis_blur_filter.cpp b81f0bd 
>   krita/plugins/filters/blur/kis_gaussian_blur_filter.cpp 0c68562 
>   krita/plugins/filters/blur/kis_motion_blur_filter.cpp 6a13ca3 
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> Diff: http://git.reviewboard.kde.org/r/108708/diff/
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> Testing
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> None, as I have no clue of the blur filters and how to see the effect of the patch. Left for Krita insiders.
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> Thanks,
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> Friedrich W. H. Kossebau
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