Adding input masking to Composite extension

[Behdad Esfahbod]

Nice idea.

On Fri, 2007-11-23 at 16:27 -0800, Keith Packard wrote:
> 
>             bool pixel_is_inside (pixel, mask, upper, lower)
>                 if (lower < upper)
>                     return lower <= (pixel & mask) && upper < (pixel & mask)
>                 else
>                     return lower <= (pixel & mask) || upper < (pixel & mask)

Do you mean "upper > "?

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