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/*
* $Id: pad.h,v 1.17 2010/02/05 23:50:22 simakov Exp $
*
* EPSILON - wavelet image compression library.
* Copyright (C) 2006,2007,2010 Alexander Simakov, <xander@entropyware.info>
*
* This file is part of EPSILON
*
* EPSILON 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 3 of the License, or
* (at your option) any later version.
*
* EPSILON 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 EPSILON. If not, see <http://www.gnu.org/licenses/>.
*
* http://epsilon-project.sourceforge.net
*/
/** \file
*
* \brief Padding
*
* The library expects that the image consists of square blocks
* of certain size. Namely, 2^N or 2^N + 1 depending on selected
* wavelet transform mode. Nevertheless, most real-life images
* do not meet this strict requirement. That`s why we need to pad
* boundary image blocks to the full size. Missing data is obtained
* using pixel mirroring. */
#ifndef __PAD_H__
#define __PAD_H__
#ifdef __cplusplus
extern "C" {
#endif
/** \addtogroup pad Padding */
/*@{*/
#include <common.h>
/** Channel extension
*
* This function extends \a input_channel using mirroring
* operation. The result is stored in the \a output_channel.
* Note that the \a output_channel must be greater than or
* equal to the \a input_channel in both width and height.
* Minimal channel size allowed is 1x1 pixels. Boundary
* pixels are duplicated.
*
* \param input_channel Input channel
* \param output_channel Output channel
* \param input_width Input channel width
* \param input_height Input channel height
* \param output_width Output channel width
* \param output_height Output channel height
*
* \return \c VOID */
void extend_channel(unsigned char **input_channel,
coeff_t **output_channel,
int input_width, int input_height,
int output_width, int output_height);
/** Channel extraction
*
* This function extracts a block of pixels from the
* \a input_channel and stores it in the \a output_channel.
* Note that the \a output_channel size must be less than
* or equal to the \a input_channel in both width and height.
* Minimal channel size allowed is 1x1 pixels.
*
* \param input_channel Input channel
* \param output_channel Output channel
* \param input_width Input channel width
* \param input_height Input channel height
* \param output_width Output channel width
* \param output_height Output channel height
*
* \return \c VOID */
void extract_channel(coeff_t **input_channel,
unsigned char **output_channel,
int input_width, int input_height,
int output_width, int output_height);
/*@}*/
#ifdef __cplusplus
}
#endif
#endif /* __PAD_H__ */
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