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/* *****************************************************************************
* bmp_or_cl.c -- Display a BMP, using ORs and clipping.
* 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_bmp_or_cl(const unsigned char *bmp, int x, int y, int width, int height)
{
unsigned short line;
char shift, *screen, *p;
int i, j, real_width, begin_x, end_x, begin_y, end_y;
char bool1=1, bool2=1, bool3;
if(!bmp || x<1-width || x>127 || y<1-height || y>63 || height<1 || width<1) return;
p = (char*)&line;
real_width = (width-1>>3<<3)+8;
if(y < 0) begin_y = -y;
else begin_y = 0;
if(y+height > 64) end_y = 64-y;
else end_y = height;
shift = 8-(x&7);
if(x<0)
{
begin_x = -x>>3;
if(shift != 8) bool1 = 0;
} else begin_x = 0;
if(x+real_width > 128) end_x = 15-(x>>3), bool2 = 0;
else end_x = real_width-1>>3;
bool3 = (end_x == real_width-1>>3);
screen = ML_vram_adress()+(y+begin_y<<4)+(x>>3);
for(i=begin_y ; i<end_y ; i++)
{
if(begin_x < end_x)
{
line = bmp[i*(real_width>>3)+begin_x] << shift;
if(bool1) screen[begin_x] |= *p;
if(shift!=8) screen[begin_x+1] |= *(p+1);
for(j=begin_x+1 ; j<end_x ; j++)
{
line = bmp[i*(real_width>>3)+j] << shift;
screen[j] |= *p;
if(shift!=8) screen[j+1] |= *(p+1);
}
}
line = bmp[i*(real_width>>3)+end_x];
if(bool3) line &= -1<<real_width-width;
line <<= shift;
if(begin_x < end_x || bool1) screen[end_x] |= *p;
if(bool2) screen[end_x+1] |= *(p+1);
screen += 16;
}
}
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