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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.
*
* $URL$
* $Id$
*
*/
#define LINEMACRO(startx, starty, deltalinear, deltanonlinear, linearvar, nonlinearvar, \
linearend, nonlinearstart, linearmod, nonlinearmod) \
x = (startx); y = (starty); \
incrNE = ((deltalinear) > 0)? (deltalinear) : -(deltalinear); \
incrNE <<= 1; \
deltanonlinear <<= 1; \
incrE = ((deltanonlinear) > 0) ? -(deltanonlinear) : (deltanonlinear); \
d = nonlinearstart-1; \
while (linearvar != (linearend)) { \
memcpy(buffer + linewidth * y + x, &color, PIXELWIDTH); \
linearvar += linearmod; \
if ((d+=incrE) < 0) { \
d += incrNE; \
nonlinearvar += nonlinearmod; \
}; \
}; \
memcpy(buffer + linewidth * y + x, &color, PIXELWIDTH);
static inline
void DRAWLINE_FUNC(byte *buffer, int linewidth, Common::Point start, Common::Point end, unsigned int color) {
int dx, dy, incrE, incrNE, d, finalx, finaly;
int x = start.x;
int y = start.y;
dx = end.x - start.x;
dy = end.y - start.y;
finalx = end.x;
finaly = end.y;
#ifdef WORDS_BIGENDIAN
color = GUINT32_SWAP_LE_BE_CONSTANT(color);
#endif
dx = abs(dx);
dy = abs(dy);
if (dx > dy) {
if (finalx < x) {
if (finaly < y) { /* llu == left-left-up */
LINEMACRO(x, y, dx, dy, x, y, finalx, dx, -PIXELWIDTH, -1);
} else { /* lld */
LINEMACRO(x, y, dx, dy, x, y, finalx, dx, -PIXELWIDTH, 1);
}
} else { /* x1 >= x */
if (finaly < y) { /* rru */
LINEMACRO(x, y, dx, dy, x, y, finalx, dx, PIXELWIDTH, -1);
} else { /* rrd */
LINEMACRO(x, y, dx, dy, x, y, finalx, dx, PIXELWIDTH, 1);
}
}
} else { /* dx <= dy */
if (finaly < y) {
if (finalx < x) { /* luu */
LINEMACRO(x, y, dy, dx, y, x, finaly, dy, -1, -PIXELWIDTH);
} else { /* ruu */
LINEMACRO(x, y, dy, dx, y, x, finaly, dy, -1, PIXELWIDTH);
}
} else { /* y1 >= y */
if (finalx < x) { /* ldd */
LINEMACRO(x, y, dy, dx, y, x, finaly, dy, 1, -PIXELWIDTH);
} else { /* rdd */
LINEMACRO(x, y, dy, dx, y, x, finaly, dy, 1, PIXELWIDTH);
}
}
}
}
#undef LINEMACRO
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