/**
 ** generic/bitmap.c ---- generic (=slow) font or bitmap draw routine
 **
 ** Copyright (c) 1995 Csaba Biegl, 820 Stirrup Dr, Nashville, TN 37221
 ** [e-mail: csaba@vuse.vanderbilt.edu].
 **
 ** This file is part of the GRX graphics library.
 **
 ** The GRX graphics library is free software; you can redistribute it
 ** and/or modify it under some conditions; see the "copying.grx" file
 ** for details.
 **
 ** This library is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 **
 **/

void drawbitmap(int x,int y,int w,int h,
		char far *bmp,int pitch,int start,GrColor fg,GrColor bg)
{
	GRX_ENTER();
	w += x; h += y;
	bmp += (unsigned int)start >> 3;
	start &= 7;
	do {
	    unsigned char far *bitp = (unsigned char far *)bmp;
	    unsigned char bits = *bitp;
	    unsigned char mask = 0x80 >> start;
	    int   xx = x;
	    do {
		drawpixel(xx,y,(bits & mask) ? fg : bg);
		if((mask >>= 1) == 0) bits = *++bitp,mask = 0x80;
	    } while(++xx != w);
	    bmp += pitch;
	} while(++y != h);
	GRX_LEAVE();
}