d_fill.cpp revision cabb5dd768714a7df34469a096b5e1aa815a2c22 
1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19*/
20// d_clear: clears a specified rectangle to the specified color
21
22#include "quakedef.h"
23
24
25/*
26================
27D_FillRect
28================
29*/
30void D_FillRect (vrect_t *rect, int color)
31{
32	int				rx, ry, rwidth, rheight;
33	unsigned char	*dest;
34	unsigned		*ldest;
35
36	rx = rect->x;
37	ry = rect->y;
38	rwidth = rect->width;
39	rheight = rect->height;
40
41	if (rx < 0)
42	{
43		rwidth += rx;
44		rx = 0;
45	}
46	if (ry < 0)
47	{
48		rheight += ry;
49		ry = 0;
50	}
51	if (rx+rwidth > vid.width)
52		rwidth = vid.width - rx;
53	if (ry+rheight > vid.height)
54		rheight = vid.height - rx;
55
56	if (rwidth < 1 || rheight < 1)
57		return;
58
59	dest = ((byte *)vid.buffer + ry*vid.rowbytes + rx);
60
61	if (((rwidth & 0x03) == 0) && (((long)dest & 0x03) == 0))
62	{
63	// faster aligned dword clear
64		ldest = (unsigned *)dest;
65		color += color << 16;
66
67		rwidth >>= 2;
68		color += color << 8;
69
70		for (ry=0 ; ry<rheight ; ry++)
71		{
72			for (rx=0 ; rx<rwidth ; rx++)
73				ldest[rx] = color;
74			ldest = (unsigned *)((byte*)ldest + vid.rowbytes);
75		}
76	}
77	else
78	{
79	// slower byte-by-byte clear for unaligned cases
80		for (ry=0 ; ry<rheight ; ry++)
81		{
82			for (rx=0 ; rx<rwidth ; rx++)
83				dest[rx] = color;
84			dest += vid.rowbytes;
85		}
86	}
87}
88
89