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When converting RGB format to RGB format with the same bits per sample,
unscaled path performs conversion on the whole buffer at once. For
non-multiple-of-16 BGR24 to RGB24 conversion it means that padding at the
end of line will be converted too. Since it may be of arbitrary length
(e.g. 8 bytes), operating on the whole buffer produces obviously wrong
results.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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Prevents overflows on very bright scenes when adding dither,
which may lead to black dots.
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Based on a somewhat similar idea in FFmpeg's swscale.
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This duplicates the function fillPlane().
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