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void vips__region_check_ownership( struct _VipsRegion *reg );
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void vips__region_no_ownership( struct _VipsRegion *reg );
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typedef int (*VipsRegionFillFn)( struct _VipsRegion *, void * );
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int vips_region_fill( struct _VipsRegion *reg,
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VipsRect *r, VipsRegionFillFn fn, void *a );