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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;
}
}
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