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/* ****************************************************************************
 * bmp_8_xor_cl.c -- Display a 8x8 BMP, using XORs and clipping.
 *
 * Copyright (C)      2011 Pierre Le Gall <legallpierre89@gmail.com>
 * Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'casiowin/monochromelib' module in libcarrot, an
 * experimental modular libc project.
 *
 * This file is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This file 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.  See the GNU Lesser General Lesser Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file. If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include <monochrome.h>

void ML_bmp_8_xor_cl(const unsigned char *bmp, int x, int y)
{
	unsigned short line;
	char i, shift, begin=0, end=8, bool1=1, bool2=1, *screen, *p=(char*)&line;
	if(!bmp || x<-7 || x>127 || y<-7 || y>63) return;
	if(y < 0) begin = -y;
	if(y > 56) end = 64-y;
	shift = 8-(x&7);
	if(x < 0) bool1 = 0;
	if(x>120 || shift==8) bool2 = 0;
	screen = ML_vram_adress()+(y+begin<<4)+(x>>3);
	for(i=begin ; i<end ; i++)
	{
		line = bmp[i]<<shift;
		if(bool1) screen[0] ^= *p;
		if(bool2) screen[1] ^= *(p+1);
		screen += 16;
	}
}