Optimise image scaling.
Optimise image scaling.

Ignore-this: d1826ac7867f56706f37649f1f62c65f

Tweak C to use pointer arithmetic rather than array indexing.
Decrement vars rather than increment which gets us free/cheap
tests against 0 on some architectures. Add new scolc and srowc
implementations for common cases.

darcs-hash:20100618125515-a72ac-bd61806b1537e76af6415abfc0c2a616e615d460.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf