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70 lines
2.3 KiB
C++
70 lines
2.3 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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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 * (starty) + (startx), &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 * (starty) + (startx), &color, PIXELWIDTH);
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template <int PIXELWIDTH>
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void _gfx_draw_line_buffer(byte *buffer, int linewidth, Common::Point start, Common::Point end, unsigned int color) {
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int incrE, incrNE, d;
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int dx = ABS(end.x - start.x);
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int dy = ABS(end.y - start.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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if (dx > dy) {
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int sign1 = (end.x < start.x) ? -1 : 1;
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int sign2 = (end.y < start.y) ? -1 : 1;
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LINEMACRO(start.x, start.y, dx, dy, start.x, start.y, end.x, dx, sign1 * PIXELWIDTH, sign2);
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} else { // dx <= dy
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int sign1 = (end.y < start.y) ? -1 : 1;
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int sign2 = (end.x < start.x) ? -1 : 1;
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LINEMACRO(start.x, start.y, dy, dx, start.y, start.x, end.y, dy, sign1, sign2 * PIXELWIDTH);
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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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