41 lines
1.1 KiB
Groff
41 lines
1.1 KiB
Groff
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.TH PREDICATES 3 "11 April 1990"
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.SH NAME
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im_region_create, im_region_free \- region creation and destruction
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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.br
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.B #include <vips/region.h>
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REGION *im_region_create( im )
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.br
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IMAGE *im;
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int im_region_free( reg )
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.br
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REGION *reg;
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.SH DESCRIPTION
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These functions create and destroy regions on images. Regions are used for
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PIO, see accompanying documentation. Regions have type
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typedef struct {
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Rect valid /* Area of im represented */
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IMAGE *im; /* im we are defined on */
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... more fields, all private and used for
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... housekeeping
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} REGION;
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im_region_create(3) returns a pointer to a new region, or NULL on error.
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Regions are made blank, with no input or output possible. See im_prepare(3),
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im_generate(3), im_start_one(3) and IM_REGION_ADDR(3).
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im_region_free(3) frees a region and any resources associated with that
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region. When an image is closed, all regions which have been created on that
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image are automatically freed.
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.SH RETURN VALUE
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All int-valued functions return zero on success and non-zero on error.
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.SH COPYRIGHT
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National Gallery, 1993
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.SH AUTHOR
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J. Cupitt \- 23/7/93
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