Geografic-Information-System/lib/psdriver/draw_bitmap.c

#include "psdriver.h"

void PS_Bitmap(int ncols, int nrows, int threshold,
	       const unsigned char *buf)
{
    int i, j;

    output("%d %d %d %d BITMAP\n", cur_x, cur_y, ncols, nrows);

    for (j = 0; j < nrows; j++) {
	unsigned int bit = 0x80;
	unsigned int acc = 0;

	for (i = 0; i < ncols; i++) {
	    unsigned int k = buf[j * ncols + i];

	    if (k > threshold)
		acc |= bit;

	    bit >>= 1;

	    if (!bit) {
		output("%02X", acc);
		bit = 0x80;
		acc = 0;
	    }
	}

	if (bit != 0x80)
	    output("%02X", acc);

	output("\n");
    }
}