newtree/source/d_fill.c

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/*
d_fill.c
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clears a specified rectangle to the specified color
Copyright (C) 1996-1997 Id Software, Inc.
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
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#ifdef HAVE_CONFIG_H
# include "config.h"
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#endif
#include "d_iface.h"
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/*
================
D_FillRect
================
*/
void
D_FillRect (vrect_t *rect, int color)
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{
int rx, ry, rwidth, rheight;
unsigned char *dest;
unsigned int *ldest;
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rx = rect->x;
ry = rect->y;
rwidth = rect->width;
rheight = rect->height;
if (rx < 0) {
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rwidth += rx;
rx = 0;
}
if (ry < 0) {
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rheight += ry;
ry = 0;
}
if (rx + rwidth > vid.width)
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rwidth = vid.width - rx;
if (ry + rheight > vid.height)
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rheight = vid.height - rx;
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if (rwidth < 1 || rheight < 1)
return;
dest = ((byte *) vid.buffer + ry * vid.rowbytes + rx);
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if (((rwidth & 0x03) == 0) && (((long) dest & 0x03) == 0)) {
// faster aligned dword clear
ldest = (unsigned int *) dest;
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color += color << 16;
rwidth >>= 2;
color += color << 8;
for (ry = 0; ry < rheight; ry++) {
for (rx = 0; rx < rwidth; rx++)
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ldest[rx] = color;
ldest = (unsigned int *) ((byte *) ldest + vid.rowbytes);
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}
} else {
// slower byte-by-byte clear for unaligned cases
for (ry = 0; ry < rheight; ry++) {
for (rx = 0; rx < rwidth; rx++)
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dest[rx] = color;
dest += vid.rowbytes;
}
}
}