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