pixel.cpp

#include <iostream>
#include <hls_stream.h>
#include <ap_axi_sdata.h>

using namespace std;

typedef ap_axis<32,0,0,0> pkt_t;
static int count = 0;
static int count_streams = 0;
static bool flag = false;
static int p_count = 3;

void pixel(
		ap_int<32> position,
		ap_int<32> stream_count,
		hls::stream< pkt_t > &din,
		hls::stream< pkt_t > &dout
) {
	#pragma HLS INTERFACE ap_ctrl_none port=return
	#pragma HLS INTERFACE s_axilite port=position
	#pragma HLS INTERFACE s_axilite port=stream_count
	#pragma HLS INTERFACE axis port=din
	#pragma HLS INTERFACE axis port=dout

	pkt_t pkt=din.read();
	count_streams++;

	
	if(count == position || count == position+1 || count == position+2){
		pkt.data -= 1;
		p_count--;
		if(p_count==0){
			count = 0;
			flag=true;
	}

	}
	
	if(!flag){
		count++;
	}

	if (count_streams == stream_count){
		count_streams = 0;
		flag = false;
		p_count=3;
	}

	// pending: have to make count=0 when TLAST signal is active -  for w not in the range of 0 to n(size of the array)


	dout.write(pkt);

}