source: buchla-68k/vlib/vspray4.c@ 4b63bf3

/*
   =============================================================================
        vspray4.c -- spray a pattern onto a graphics screen using tsplot4()
        Version 5 -- 1987-10-09 -- D.N. Lynx Crowe
   =============================================================================
*/

#include "ram.h"

static  int8_t cl[81];

/*
   =============================================================================
        vspray4(vobj, vwid, fg, ml, vb, pitch) -- spray a pattern on the screen

        Uses 'vobj' of width 'vwid' as the screen, 'fg' as the color, 'vb' as
        the bank, 'pitch' as the vertical pitch, and 'ml' as the pattern.

        If 'vb' EQ -1,  the bank is not set.  The color in 'fg' will be taken
        from the lower 4 bits.

        The list 'ml' points at pairs of counts and characters.  The last count
        is -1,  and the list terminates with a null pointer.
   =============================================================================
*/

void vspray4(volatile uint16_t *vobj, int16_t vwid, int16_t fg, int8_t *ml[], int16_t vb, int16_t pitch)
{
        register int8_t *cp, *lp, c;
        register int16_t j, k, row;

        row = 0;

        fg &= 0x000F;
        fg |= fg << 4;
        fg |= fg << 8;

        if (-1 NE vb)
                vbank(vb);

        while (NULL NE (cp = *ml++)) {

                lp = cl;

                while (-1 NE (j = *cp++)) {

                        j &= 0x00FF;
                        c = *cp++;

                        for (k = 0; k < j; k++)
                                *lp++ = c;
                }

                *lp = '\0';

                tsplot4(vobj, vwid, fg, row++, 0, cl, pitch);
        }
}