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We operated on 31-bits, but with e.g. lanczos scaling, values can
add up to beyond 0x80000000, thus leading to output of zeroes. Drop
one bit of precision fixes this.
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We would use the second half of the U plane buffer, rather than the
V plane buffer, to output the V plane pixels.
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This means that precision is retained when scaling between sample
formats with >8 bits per component (48bit RGB, 16bit grayscale,
9/10/16bit YUV).
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Signed-off-by: Mans Rullgard <mans@mansr.com>
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