From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Sat, 25 Jan 2014 11:42:56 +0000 (+0100)
Subject: Rescale resampling weights so that the sum becomes one.
X-Git-Tag: 1.0~55
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=aa3e630eb0c455921c721f9ccd84e872bc9757bc;hp=aa3e630eb0c455921c721f9ccd84e872bc9757bc

Rescale resampling weights so that the sum becomes one.

For some reason, I had forgotten this, and it showed up because Qt
has buggy handling of pixels with alpha != 0xff. Add unit test
so it doesn't happen again.

I'm a bit concerned that rounding might cause problems so that we
should perhaps renormalize after the bilinear conversion, but we
can deal with that later if it should show up.
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