RLE_GETRAW(3) 3 (2/2/87) RLE_GETRAW(3)
NAME
rle_getraw - Read run length encoded data from an RLE file.
rle_freeraw - Free pixel storage allocated by rle_getraw.
SYNOPSIS
#include <rle.h>
#include <rle_raw.h>
unsigned int rle_getraw( the_hdr, scanraw, nraw )
rle_hdr * the_hdr;
rle_op ** scanraw;
int * nraw;
void rle_freeraw( the_hdr, scanraw, nraw );
rle_hdr * the_hdr;
rle_op ** scanraw;
int * nraw;
DESCRIPTION
Rle_getraw can be used to read information from an RLE file
in the "raw" form.
The scanraw argument is an array of pointers to arrays of
rle_op(3) structures. Each rle_op structure specifies a run
or sequence of pixel values. The array nraw gives the
number of rle_op structures for each channel. I.e., nraw[i]
is the length of the array pointed to by scanraw[i].
Return value is the current scanline number. Returns 32768
at EOF.
Sufficient space must be allocated in the arrays of rle_op
structures to hold the data read from the file. A function,
rle_raw_alloc(3), is provided to make this easier. The
storage required by any pixel sequences in the input will be
dynamically allocated by rle_getraw.
The pixel storage allocated dynamically by rle_getraw(3)
must be freed to avoid memory leaks. This is most easily
accomplished by calling rle_freeraw. The argument scanraw
points to an array of rle_op structures, with nraw
indicating the number of structures in each channel. All
pixel data arrays will be freed by the call to rle_freeraw.
EXAMPLE
The usual code looks something like
rle_hdr in_hdr, out_hdr;
rle_op **raw;
int *nraw;
while ( rle_getraw( &in_hdr, raw, nraw ) != 32768 )
{
/* Process data. */
Page 1 (printed 12/1/98)
RLE_GETRAW(3) 3 (2/2/87) RLE_GETRAW(3)
rle_putraw( &out_hdr, raw, nraw );
rle_freeraw( &in_hdr, raw, nraw );
}
SEE ALSO
rle_hdr(3), rle_op(3), rle_putraw(3), rle_raw_alloc(3),
rle_raw_free(3), rle_getrow(3), rle_getskip(3), librle(3),
RLE(5).
AUTHOR
Spencer W. Thomas
University of Utah
Page 2 (printed 12/1/98)
