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https://github.com/libretro/scummvm.git
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96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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namespace Sci {
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#define LINEMACRO(startx, starty, deltalinear, deltanonlinear, linearvar, nonlinearvar, \
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linearend, nonlinearstart, linearmod, nonlinearmod) \
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x = (startx); y = (starty); \
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incrNE = ((deltalinear) > 0) ? (deltalinear) : -(deltalinear); \
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incrNE <<= 1; \
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deltanonlinear <<= 1; \
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incrE = ((deltanonlinear) > 0) ? -(deltanonlinear) : (deltanonlinear); \
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d = nonlinearstart - 1; \
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while (linearvar != (linearend)) { \
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memcpy(buffer + linewidth * y + x, &color, PIXELWIDTH); \
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linearvar += linearmod; \
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if ((d += incrE) < 0) { \
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d += incrNE; \
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nonlinearvar += nonlinearmod; \
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}; \
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}; \
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memcpy(buffer + linewidth * y + x, &color, PIXELWIDTH);
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static inline void DRAWLINE_FUNC(byte *buffer, int linewidth, Common::Point start, Common::Point end, unsigned int color) {
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int dx, dy, incrE, incrNE, d, finalx, finaly;
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int x = start.x;
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int y = start.y;
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dx = end.x - start.x;
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dy = end.y - start.y;
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finalx = end.x;
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finaly = end.y;
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#ifdef SCUMM_BIG_ENDIAN
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color = SWAP_BYTES_32(color);
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#endif
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dx = abs(dx);
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dy = abs(dy);
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if (dx > dy) {
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if (finalx < x) {
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if (finaly < y) { // llu == left-left-up
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LINEMACRO(x, y, dx, dy, x, y, finalx, dx, -PIXELWIDTH, -1);
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} else { /* lld */
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LINEMACRO(x, y, dx, dy, x, y, finalx, dx, -PIXELWIDTH, 1);
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}
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} else { // x1 >= x
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if (finaly < y) { // rru
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LINEMACRO(x, y, dx, dy, x, y, finalx, dx, PIXELWIDTH, -1);
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} else { // rrd
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LINEMACRO(x, y, dx, dy, x, y, finalx, dx, PIXELWIDTH, 1);
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}
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}
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} else { // dx <= dy
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if (finaly < y) {
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if (finalx < x) { // luu
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LINEMACRO(x, y, dy, dx, y, x, finaly, dy, -1, -PIXELWIDTH);
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} else { /* ruu */
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LINEMACRO(x, y, dy, dx, y, x, finaly, dy, -1, PIXELWIDTH);
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}
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} else { // y1 >= y
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if (finalx < x) { // ldd
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LINEMACRO(x, y, dy, dx, y, x, finaly, dy, 1, -PIXELWIDTH);
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} else { // rdd
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LINEMACRO(x, y, dy, dx, y, x, finaly, dy, 1, PIXELWIDTH);
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}
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}
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}
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}
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#undef LINEMACRO
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} // End of namespace Sci
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