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/* ****************************************************************************
 * vertical_line.c -- Draw a vertical line.
 * 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 governed by the CeCILL-C license under French law and abiding
 * by the rules of distribution of free software. You can use, modify and or
 * redistribute it under the terms of the CeCILL-C license as circulated by
 * CEA, CNRS and INRIA at the following URL: http://www.cecill.info
 *
 * As a counterpart to the access to the source code and rights to copy, modify
 * and redistribute granted by the license, users are provided only with a
 * limited warranty and the software's author, the holder of the economic
 * rights, and the successive licensors have only limited liability.
 *
 * In this respect, the user's attention is drawn to the risks associated with
 * loading, using, modifying and/or developing and reproducing the software by
 * the user in light of its specific status of free software, that may mean
 * that it is complicated to manipulate, and that also therefore means that it
 * is reserved for developers and experienced professionals having in-depth
 * computer knowledge. Users are therefore encouraged to load and test the
 * software's suitability as regards their requirements in conditions enabling
 * the security of their systems and/or data to be ensured and, more generally,
 * to use and operate it in the same conditions as regards security.
 *
 * The fact that you are presently reading this means you have had knowledge of
 * the CeCILL-C license and that you accept its terms.
 * ************************************************************************* */
#include <monochrome.h>

void ML_vertical_line(int x, int y1, int y2, ML_Color color)
{
    int i, j;
    char checker, byte, *vram = ML_vram_adress();
	if(x&~127 || (y1<0 && y2<0) || (y1>63 && y2>63)) return;
	if(y1 > y2)
	{
		int tmp = y1;
		y1 = y2;
		y2 = tmp;
	}
	if(y1 < 0) y1 = 0;
	if(y2 > 63) y2 = 63;

	i = (y1<<4)+(x>>3);
	j = (y2<<4)+(x>>3);
	switch(color)
	{
		case ML_BLACK:
			byte = 128>>(x&7);
			for( ; i<=j ; i+=16)
				vram[i] |= byte;
			break;
		case ML_WHITE:
			byte = ~(128>>(x&7));
			for( ; i<=j ; i+=16)
				vram[i] &= byte;
			break;
		case ML_XOR:
			byte = 128>>(x&7);
			for( ; i<=j ; i+=16)
				vram[i] ^= byte;
			break;
		case ML_CHECKER:
			byte = 128>>(x&7);
			checker = y1&1^x&1;
			for( ; i<=j ; i+=16)
			{
				if(checker) vram[i] &= ~byte;
				else vram[i] |= byte;
				checker = !checker;
			}
			break;
	}
}