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/*
* $Id: pad.c,v 1.15 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
*/
#include <common.h>
#include <pad.h>
#include <color.h>
void extend_channel(unsigned char **input_channel,
coeff_t **output_channel,
int input_width, int input_height,
int output_width, int output_height)
{
int i, j;
/* Sanity checks */
assert((input_width > 0) && (input_height > 0));
assert((output_width > 0) && (output_height > 0));
assert(output_width >= input_width);
assert(output_height >= input_height);
/* Copy original */
for (i = 0; i < input_height; i++) {
for (j = 0; j < input_width; j++) {
output_channel[i][j] = input_channel[i][j];
}
}
/* Fill horizontally */
for (i = 0; i < input_height; i++) {
for (j = 0; j < output_width - input_width; j++) {
output_channel[i][input_width + j] =
output_channel[i][ABS(input_width - j - 1)];
}
}
/* Fill vertically */
for (j = 0; j < output_width; j++) {
for (i = 0; i < output_height - input_height; i++) {
output_channel[i + input_height][j] =
output_channel[ABS(input_height - i - 1)][j];
}
}
}
void extract_channel(coeff_t **input_channel,
unsigned char **output_channel,
int input_width, int input_height,
int output_width, int output_height)
{
int i, j;
/* Sanity checks */
assert((input_width > 0) && (input_height > 0));
assert((output_width > 0) && (output_height > 0));
assert(output_width <= input_width);
assert(output_height <= output_height);
/* Extract & clip original data */
for (i = 0; i < output_height; i++) {
for (j = 0; j < output_width; j++) {
output_channel[i][j] = CLIP(input_channel[i][j]);
}
}
}
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