psdriver/draw_bitmap.c

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#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 > (unsigned int)threshold)
                acc |= bit;
 
            bit >>= 1;
 
            if (!bit) {
                output("%02X", acc);
                bit = 0x80;
                acc = 0;
            }
        }
 
        if (bit != 0x80)
            output("%02X", acc);
 
        output("\n");
    }
}