im_makerw - make an IMAGE writeable
int im_makerw( image )
im_makerw(3) attempts to make image writeable, ready for an in-place
operation. Its actions are just as those for im_incheck(3), except
that descriptors which after im_incheck(3) end up as IM_MMAPIN
descriptors, magically become IM_MMAPINRW descriptors.
Extreme caution is urged! You can permanently damage valuable data with
The function returns 0 on success and -1 on error.
im_mmapin(3), im_mmapinrw(3), im_fastlineuser(3).
National Gallery, 1992
22 April 1992