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/* ****************************************************************************
 * horizontal_line.c -- Draw a horizontal 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_horizontal_line(int y, int x1, int x2, ML_Color color)
{
    int i;
    char checker;
    char* vram = ML_vram_adress();
    if(y&~63 || (x1<0 && x2<0) || (x1>127 && x2>127)) return;
    if(x1 > x2)
    {
    	i = x1;
    	x1 = x2;
    	x2 = i;
    }
    if(x1 < 0) x1 = 0;
    if(x2 > 127) x2 = 127;
    switch(color)
    {
    	case ML_BLACK:
			if(x1>>3 != x2>>3)
			{
				vram[(y<<4)+(x1>>3)] |= 255 >> (x1&7);
				vram[(y<<4)+(x2>>3)] |= 255 << 7-(x2&7);
				for(i=(x1>>3)+1 ; i<x2>>3 ; i++)
					vram[(y<<4) + i] = 255;
			}
			else vram[(y<<4)+(x1>>3)] |= (255>>(x1%8 + 7-x2%8))<<(7-(x2&7));
			break;
		case ML_WHITE:
			if(x1>>3 != x2>>3)
			{
				vram[(y<<4)+(x1>>3)] &= 255 << 8-(x1&7);
				vram[(y<<4)+(x2>>3)] &= 255 >> 1+(x2&7);
				for(i=(x1>>3)+1 ; i<x2>>3 ; i++)
					vram[(y<<4) + i] = 0;
			}
			else vram[(y<<4)+(x1>>3)] &= (255<<8-(x1&7)) | (255>>1+(x2&7));
			break;
		case ML_XOR:
			if(x1>>3 != x2>>3)
			{
				vram[(y<<4)+(x1>>3)] ^= 255 >> (x1&7);
				vram[(y<<4)+(x2>>3)] ^= 255 << 7-(x2&7);
				for(i=(x1>>3)+1 ; i<(x2>>3) ; i++)
					vram[(y<<4) + i] ^= 255;
			}
			else vram[(y<<4)+(x1>>3)] ^= (255>>((x1&7) + 7-(x2&7)))<<(7-(x2&7));
			break;
		case ML_CHECKER:
			checker = (y&1 ? 85 : 170);
			if(x1>>3 != x2>>3)
			{
				vram[(y<<4)+(x1>>3)] &= 255 << 8-(x1&7);
				vram[(y<<4)+(x2>>3)] &= 255 >> 1+(x2&7);
				vram[(y<<4)+(x1>>3)] |= checker & 255>>(x1&7);
				vram[(y<<4)+(x2>>3)] |= checker & 255<<7-(x2&7);
				for(i=(x1>>3)+1 ; i<x2>>3 ; i++)
					vram[(y<<4) + i] = checker;
			}
			else
			{
				vram[(y<<4)+(x1>>3)] &= (255<<8-(x1&7)) | (255>>1+(x2&7));
				vram[(y<<4)+(x1>>3)] |= checker & (255>>(x1%8 + 7-x2%8))<<(7-(x2&7));
			}
			break;
    }
}