[sane-devel] Re: sane-devel digest, Vol 1 #826 - 6 msgs

[Mattias Ellert]

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On Tue, 2005-07-05 at 02:32 -0400, Gregory C. Johnson wrote:

> BTW, pedantically speaking, shouldn't:
>=20
>               *dst-- =3D (*src << 4) & 0xf0;
>               *dst-- =3D (*src--) & 0xf0;
> read as:
>=20
>               *dst-- =3D ((*src << 4) & 0xf0) + 0x07;
>               *dst-- =3D ((*src--)    & 0xf0) + 0x07;
>=20

Even better would be:

              *dst-- =3D ((*src << 4) & 0xf0) + ((*src)        & 0x0f);
              *dst-- =3D ((*src)      & 0xf0) + ((*src-- >> 4) & 0x0f);

Then 0 would map to 0 and 15 to 255, i.e. white is white and black is
black.

        Mattias


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