On Fri, Jul 15, 2016 at 12:35 AM Jean-Baptiste Mardelle <j...@kdenlive.org>
wrote:
> * frei0r.cairoblend: if we want to optimize it as I did for qtblend
>
I know you moved onto qtblend, but I tried an optimization in frei0r
cairoblend tonight based on the idea of checking if the B image has an all
opaque alpha channel. I made it directly within the frei0r mixer effect. I
tried a couple of routines, but opted for one that exits the loop as soon
as a non-opaque alpha value is found in order to reduce any overhead
imposed by the optimization. Also, I made it only apply when using the
normal/over operation and opacity parameter = 1.0. When all conditions for
optimization are met, I simply memcpy() that B image to the output. I only
see about a 9% speed gain, which is fairly minor. I have not decided
whether to commit that or not.
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