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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;
}
}
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