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path: root/arch/casiowin/monochromelib/src/horizontal_line.c
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/* *****************************************************************************
 * horizontal_line.c -- Draw a horizontal line.
 * Copyright (C) 2011      Pierre "PierrotLL" Le Gall <legallpierre89@gmail.com>
 * Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of libcarrot.
 * libcarrot 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 3.0 of the License,
 * or (at your option) any later version.
 *
 * libcarrot 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 Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the libcarrot; if not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************** */
#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;
    }
}