VRegion8.h

// VIPS region wrapper
 
/*
 
    This file is part of VIPS.
 
    VIPS is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301  USA
 
 */
 
/*
 
    These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
 
 */
 
#ifndef VIPS_VREGION_H
#define VIPS_VREGION_H
 
#include <vips/vips.h>
 
VIPS_NAMESPACE_START

class VRegion : public VObject {
public:
    explicit VRegion(VipsRegion *region, VSteal steal = STEAL)
        : VObject((VipsObject *) region, steal)
    {
    }

    static VRegion
    new_from_image(VImage image);

    VipsRegion *
    get_region() const
    {
        return (VipsRegion *) VObject::get_object();
    }

    void
    prepare(const VipsRect *rect) const
    {
        if (vips_region_prepare(get_region(), rect))
            throw VError();
    }

    void
    prepare(int left, int top, int width, int height) const
    {
        VipsRect rect = { left, top, width, height };
 
        prepare(&rect);
    }

    VipsRect
    valid() const
    {
        return get_region()->valid;
    }

    VipsPel *
    addr() const
    {
        return addr(0);
    }

    VipsPel *
    addr(size_t i) const
    {
        return &VIPS_REGION_ADDR_TOPLEFT(get_region())[i];
    }

    VipsPel *
    addr(int x, int y) const
    {
        return VIPS_REGION_ADDR(get_region(), x, y);
    }

    size_t
    stride() const
    {
        return VIPS_REGION_LSKIP(get_region());
    }

    VipsPel
    operator[](size_t i) const
    {
        return *addr(i);
    }

    VipsPel
    operator()(int x, int y) const
    {
        return *addr(x, y);
    }
};
 
VIPS_NAMESPACE_END
 
#endif /*VIPS_VREGION_H*/