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// 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
/**
* A region of an image. Can be used to access raw pixel data.
* */
class VRegion : public VObject {
public:
/**
* Create a VRegion that wraps a VipsRegion object. If steal
* is STEAL, then this VRegion takes over ownership of the libvips
* object and will automatically unref it.
*/
explicit VRegion(VipsRegion *region, VSteal steal = STEAL)
: VObject((VipsObject *) region, steal)
{
}
/**
* Create a VRegion from an image.
*/
static VRegion
new_from_image(VImage image);
/**
* Get a pointer to the underlying VipsRegion object.
*/
VipsRegion *
get_region() const
{
return (VipsRegion *) VObject::get_object();
}
/**
* Prepare the region from VipsRect.
*/
void
prepare(const VipsRect *rect) const
{
if (vips_region_prepare(get_region(), rect))
throw VError();
}
/**
* Prepare the region from rectangle coordinates.
*/
void
prepare(int left, int top, int width, int height) const
{
VipsRect rect = { left, top, width, height };
prepare(&rect);
}
/**
* Get valid bounds of the region.
*/
VipsRect
valid() const
{
return get_region()->valid;
}
/**
* Get pointer to the start of the region.
*/
VipsPel *
addr() const
{
return addr(0);
}
/**
* Get pointer at the given index of the region.
*/
VipsPel *
addr(size_t i) const
{
return &VIPS_REGION_ADDR_TOPLEFT(get_region())[i];
}
/**
* Get pointer at the given coordinates of the region.
*/
VipsPel *
addr(int x, int y) const
{
return VIPS_REGION_ADDR(get_region(), x, y);
}
/**
* Get the stride (bytes per row, including padding) of the region.
*/
size_t
stride() const
{
return VIPS_REGION_LSKIP(get_region());
}
/**
* Get VipsPel at the given index of the region.
*/
VipsPel
operator[](size_t i) const
{
return *addr(i);
}
/**
* Get VipsPel at the given coordinates of the region.
*/
VipsPel
operator()(int x, int y) const
{
return *addr(x, y);
}
};
VIPS_NAMESPACE_END
#endif /*VIPS_VREGION_H*/