100 lines
3.6 KiB
Groff
100 lines
3.6 KiB
Groff
|
.TH IM_OFFSETS45 3 "28 May 1991"
|
||
|
|
.SH NAME
|
||
|
|
im_offsets45, im_offsets90, im_rotate_imask45, im_rotate_dmask45,
|
||
|
|
im_rotate_imask90, im_rotate_dmask90 \- rotate square masks
|
||
|
|
.SH SYNOPSIS
|
||
|
|
|
||
|
|
.B int *im_offsets45( size )
|
||
|
|
.br
|
||
|
|
.B int size;
|
||
|
|
|
||
|
|
.B int *im_offsets90( size )
|
||
|
|
.br
|
||
|
|
.B int size;
|
||
|
|
|
||
|
|
.B INTMASK *im_rotate_imask45( m, name )
|
||
|
|
.br
|
||
|
|
.B INTMASK *m;
|
||
|
|
.br
|
||
|
|
.B char *name;
|
||
|
|
|
||
|
|
.B DOUBLEMASK *im_rotate_dmask45( m, name )
|
||
|
|
.br
|
||
|
|
.B DOUBLEMASK *m;
|
||
|
|
.br
|
||
|
|
.B char *name;
|
||
|
|
|
||
|
|
.B INTMASK *im_rotate_imask90( m, name )
|
||
|
|
.br
|
||
|
|
.B INTMASK *m;
|
||
|
|
.br
|
||
|
|
.B char *name;
|
||
|
|
|
||
|
|
.B DOUBLEMASK *im_rotate_dmask90( m, name )
|
||
|
|
.br
|
||
|
|
.B DOUBLEMASK *m;
|
||
|
|
.br
|
||
|
|
.B char *name;
|
||
|
|
|
||
|
|
.SH DESCRIPTION
|
||
|
|
These functions can be used to produce the integer offsets needed to rotate
|
||
|
|
masks by 45 or 90 degrees clockwise.
|
||
|
|
|
||
|
|
.B im_offsets45()
|
||
|
|
accepts only even size and returns a pointer to an int buffer of size*size.
|
||
|
|
The program mallocs the buffer and puts into it the integer offsets needed to
|
||
|
|
rotate a mask of even size size by 45 degrees. For instance if size is 3 the
|
||
|
|
program returns the buffer 3 0 1 6 4 2 7 8 5 which is the offsets needed to
|
||
|
|
rotate a mask with offsets 0 1 2 3 4 5 6 7 8. The function return a
|
||
|
|
pointer to valid data on success or NULL on error. Since the program mallocs
|
||
|
|
a buffer, the user should free the returned pointer accordingly.
|
||
|
|
|
||
|
|
.B im_offsets90()
|
||
|
|
accepts any size and returns a pointer to an int buffer of size*size. The
|
||
|
|
program mallocs the buffer and puts into it the integer offsets needed to
|
||
|
|
rotate a mask of size size by 90 degrees. For instance if size is 3 the
|
||
|
|
program returns the buffer 6 3 0 7 4 1 8 5 2 which is the offsets needed to
|
||
|
|
rotate a mask with offsets 0 1 2 3 4 5 6 7 8. The function return a
|
||
|
|
pointers to valid data on success or NULL on error. Since the program mallocs
|
||
|
|
a buffer, the user should free the returned pointer accordingly.
|
||
|
|
|
||
|
|
.B im_rotate_imask45()
|
||
|
|
rotates the INTMASK m by 45 degrees and returns the rotated mask. The filename
|
||
|
|
member of the returned structure is set to name. The program allocates memory
|
||
|
|
for the new mask and therefore the user must free the returned mask by a call
|
||
|
|
to im_free_imask(3). The returned mask is rotated by 45 degrees clockwise.
|
||
|
|
The function return a valid INTMASK pointer on success or NULL on error.
|
||
|
|
|
||
|
|
.B im_rotate_dmask45()
|
||
|
|
rotates the DOUBLEMASK m by 45 degrees
|
||
|
|
and returns the rotated mask. The filename
|
||
|
|
member of the returned structure is set to name. The program allocates memory
|
||
|
|
for the new mask and therefore the user must free the returned mask by a call
|
||
|
|
to im_free_dmask(3). The returned mask is rotated by 45 degrees clockwise.
|
||
|
|
The function return a valid DOUBLEMASK pointer on success or NULL on error.
|
||
|
|
|
||
|
|
.B im_rotate_imask90()
|
||
|
|
rotates the INTMASK m by 90 degrees and returns the rotated mask. The filename
|
||
|
|
member of the returned structure is set to name. The program allocates memory
|
||
|
|
for the new mask and therefore the user must free the returned mask by a call
|
||
|
|
to im_free_imask(3). The returned mask is rotated by 90 degrees clockwise.
|
||
|
|
The function return a valid INTMASK pointer on success or NULL on error.
|
||
|
|
|
||
|
|
.B im_rotate_dmask90()
|
||
|
|
rotates the DOUBLEMASK m by 90 degrees
|
||
|
|
and returns the rotated mask. The filename
|
||
|
|
member of the returned structure is set to name. The program allocates memory
|
||
|
|
for the new mask and therefore the user must free the returned mask by a call
|
||
|
|
to im_free_dmask(3). The returned mask is rotated by 90 degrees clockwise.
|
||
|
|
The function return a valid DOUBLEMASK pointer on success or NULL on error.
|
||
|
|
|
||
|
|
.SH RETURN VALUE
|
||
|
|
.SH SEE ALSO
|
||
|
|
im_read_imask(3), im_read_dmask(3), im_free_imask(3), im_free_dmask(3),
|
||
|
|
im_gradient(3), im_compass(3), im_conv(3).
|
||
|
|
.SH COPYRIGHT
|
||
|
|
.br
|
||
|
|
N. Dessipris
|
||
|
|
.SH AUTHOR
|
||
|
|
N. Dessipris \-28/05/1991
|