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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
namespace Sci {
#define LINEMACRO(startx, starty, deltalinear, deltanonlinear, linearvar, nonlinearvar, \
linearend, nonlinearstart, linearmod, nonlinearmod) \
incrNE = ((deltalinear) > 0) ? (deltalinear) : -(deltalinear); \
incrNE <<= 1; \
deltanonlinear <<= 1; \
incrE = ((deltanonlinear) > 0) ? -(deltanonlinear) : (deltanonlinear); \
d = nonlinearstart - 1; \
while (linearvar != (linearend)) { \
memcpy(buffer + linewidth * (starty) + (startx), &color, PIXELWIDTH); \
linearvar += linearmod; \
if ((d += incrE) < 0) { \
d += incrNE; \
nonlinearvar += nonlinearmod; \
}; \
}; \
memcpy(buffer + linewidth * (starty) + (startx), &color, PIXELWIDTH);
template <int PIXELWIDTH>
void _gfx_draw_line_buffer(byte *buffer, int linewidth, Common::Point start, Common::Point end, unsigned int color) {
int incrE, incrNE, d;
int dx = ABS(end.x - start.x);
int dy = ABS(end.y - start.y);
#ifdef SCUMM_BIG_ENDIAN
color = SWAP_BYTES_32(color);
#endif
if (dx > dy) {
int sign1 = (end.x < start.x) ? -1 : 1;
int sign2 = (end.y < start.y) ? -1 : 1;
LINEMACRO(start.x, start.y, dx, dy, start.x, start.y, end.x, dx, sign1 * PIXELWIDTH, sign2);
} else { // dx <= dy
int sign1 = (end.y < start.y) ? -1 : 1;
int sign2 = (end.x < start.x) ? -1 : 1;
LINEMACRO(start.x, start.y, dy, dx, start.y, start.x, end.y, dy, sign1, sign2 * PIXELWIDTH);
}
}
#undef LINEMACRO
} // End of namespace Sci
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