im_iocheck(3)

NAME

im_pincheck, im_poutcheck, im_piocheck - checks image descriptors for PIO

SYNOPSIS

#include <vips/vips.h>
int im_pincheck( in )
IMAGE *in;
int im_poutcheck( out )
IMAGE *out;
int im_piocheck( in, out)
IMAGE *in, *out;

DESCRIPTION

im_pincheck(3) checks that an image descriptor is suitable for PIO input. If the descriptor is IM_OPENOUT and the descriptor has been written to, it is automatically `rewound,' that is, it is closed and reopened as an IM_MMAPIN descriptor.

im_poutcheck(3) checks that a descriptor is suitable for PIO output.

im_piocheck(3) simply calls in_pincheck(3) for image in and im_poutcheck(3) for image out.

RETURN VALUE

All functions returns 0 on success and -1 on error.

SEE ALSO

im_generate(3), im_open(3).

COPYRIGHT

National Gallery

AUTHOR

J. Cupitt - 23/7/93

11 April 1990 IM_IOCHECK(3)