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/* Copyright (C) 2016 - IIT Bombay - FOSSEE
This file must be used under the terms of the CeCILL.
This source file is licensed as described in the file COPYING, which
you should have received as part of this distribution. The terms
are also available at
http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
Author: Siddhesh Wani
Organization: FOSSEE, IIT Bombay
Email: toolbox@scilab.in
*/
/* This function calculates difference between adjacent members of given
input array/matrix */
#include "diffc.h"
void i16diffca(int16 *in, int row, int col, int depth, int dim, int16 *out)
{
int counter, depth_count;
int row_count, col_count;
int16 *buffer; /*To store intermediate results*/
depth_count = 1;
if(dim == 0)
{ /*For dim = 0, we calculate difference between adjacent elements
in case of arrays. In case of matrices, we calculate difference along
first column, and then continue to second (diff between first element
of second column and last element of first column, then third etc.*/
if(depth == 1)
{/*for depth=1, a buffer is not needed. Directly write result in
out buffer*/
for(counter = 0; counter < row*col - depth_count; counter++)
{
out[counter] = in[counter+1] - in[counter];
}
}
else
{ /*define buffer for storing intermediate results*/
buffer = (int16 *) malloc (sizeof(int16)*(row*col-1));
while(depth_count <= depth)
{
if(depth_count == 1)
{
/*calculate diff and store in buffer*/
for(counter = 0; counter < row*col - depth_count; counter++)
{
buffer[counter] = in[counter+1] - in[counter];
}
}
else if(depth_count < depth)
{
for(counter = 0; counter <= row*col - depth_count ; counter++)
{
buffer[counter] = buffer[counter+1] - buffer[counter];
}
}
/*For last step use output buffer to store result*/
else
{
for(counter = 0; counter < row*col - depth_count; counter++)
{
out[counter] = buffer[counter+1] - buffer[counter];
}
}
depth_count += 1;
}
}
}
else if(dim == 1)
{
/*For dim = 1, difference is calculated along rows. Each element of
first row is subtracted from corresponding element of second row and
result is stored in first row. Same thing is repeated till last row. */
if (depth == 1)
{
/*If depth is 1, store result directly in out buffer*/
for(col_count = 0; col_count < col; col_count++)
{
for(row_count = 0; row_count < row - 1; row_count++)
{
out[col_count*(row-1)+row_count] = in[col_count*row + row_count+1] \
- in[col_count*row + row_count];
}
}
}
else
{
/*If depth is not 1, declare a buffer to store intermediate
results. At last step store result into out buffer*/
buffer = (int16 *) malloc (sizeof(int16)*((row-1)*col));
while(depth_count <= depth)
{
if(depth_count == 1)
{
/*For first step, use in buffer and store results in buffer*/
for(col_count = 0; col_count < col; col_count++)
{
for(row_count = 0; row_count < row - 1; row_count++)
{
buffer[col_count*row+row_count] = in[col_count*row + row_count + 1] \
- in[col_count*row + row_count];
}
}
}
else if(depth_count < depth)
{
for(col_count = 0; col_count < col; col_count++)
{
for(row_count = 0; row_count < row - depth_count; row_count++)
{
buffer[col_count*row+row_count] = buffer[col_count*row + row_count + 1] \
- buffer[col_count*row + row_count];
}
}
}
else
{
for(col_count = 0; col_count < col; col_count++)
{
for(row_count = 0; row_count < row - depth_count; row_count++)
{
out[col_count*(row-depth_count)+row_count] = buffer[col_count*row + row_count+1] \
- buffer[col_count*row + row_count];
}
}
}
depth_count +=1;
}
}
}
else if(dim == 2)
{
/*For dim = 2, difference is calculated along columns. Each element of
first column is subtracted from corresponding element of second column
and result is stored in first column. Same thing is repeated till last
column. */
if(depth == 1)
{
for(row_count = 0; row_count < row; row_count++)
{
for(col_count = 0; col_count < col - 1; col_count++)
{
out[col_count*row+row_count] = in[(col_count+1)*row + row_count] \
- in[col_count*row + row_count];
}
}
}
else
{
/*If depth is not 1, declare a buffer to store intermediate
results. At last step store result into out buffer*/
buffer = (int16 *) malloc (sizeof(int16)*(row*(col-1)));
while(depth_count <= depth)
{
if(depth_count == 1)
{
for(row_count = 0; row_count < row; row_count++)
{
for(col_count = 0; col_count < col - 1; col_count++)
{
buffer[col_count*row+row_count] = in[(col_count+1)*row + row_count] \
- in[col_count*row + row_count];
}
}
}
else if(depth_count < depth)
{
for(row_count = 0; row_count < row; row_count++)
{
for(col_count = 0; col_count < col - depth_count; col_count++)
{
buffer[col_count*row+row_count] = buffer[(col_count+1)*row + row_count] \
- buffer[col_count*row + row_count];
}
}
}
else
{
for(row_count = 0; row_count < row; row_count++)
{
for(col_count = 0; col_count < col - depth_count; col_count++)
{
out[col_count*row+row_count] = buffer[(col_count+1)*row + row_count] \
- buffer[col_count*row + row_count];
}
}
}
depth_count += 1;
}
}
}
}
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