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Current File : /proc/1630575/root/proc/1630575/root/proc/1630575/root/proc/self/root/usr/include/vips/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

/**
 * 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*/

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