// 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

//Function flips the input matrix along given dimension

#include "flipdim.h"

void i16flipdima (int16 *in, int row, int col, int dim, int blk_size, int16 *out)
{
	int col_count = 0, row_count = 0, blk_count = 0, count = 0;
	if(dim == 1) //flip rows
	{
		if(blk_size == 1)
		{
			for(col_count = 0; col_count < col; col_count++)
			{
				for(row_count = 0; row_count< row;row_count++)
				{
					out[col_count*row+row_count] = in[col_count*row+(row - row_count - 1)];
				}
			}
		}
		else //block size is more than 1
		{
			for(col_count = 0; col_count < col; col_count++)
			{
				count = blk_size;
				blk_count = 0;
				for(row_count = 0; row_count< row;row_count++)
				{
					out[col_count*row+row_count] = in[col_count*row+(row - blk_count*blk_size - count)];
					if(--count == 0)
					{
						blk_count += 1;
						count = blk_size;
					}
				}
			}
			
		}
	}
	else if(dim == 2) //flip columns
	{
		if(blk_size == 1)
		{
			for(col_count = 0; col_count < col; col_count++)
			{
				for(row_count = 0; row_count< row;row_count++)
				{
					out[col_count*row+row_count] = in[(col- col_count - 1)*row+row_count];
				}
			}
		}
		else
		{
			count = blk_size;
			blk_count = 0;
			for(col_count = 0; col_count < col; col_count++)
			{
				for(row_count = 0; row_count< row;row_count++)
				{
					out[col_count*row+row_count] = in[(col - blk_count*blk_size - count)*row+row_count];
				}
				if(--count == 0)
				{
					count = blk_size;
					blk_count += 1;
				}
			}	
		}
	}
}