The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/d_fill.c

@@ -0,0 +1,88 @@
+/*
+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 the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+// d_clear: clears a specified rectangle to the specified color
+
+#include "quakedef.h"
+
+
+/*
+================
+D_FillRect
+================
+*/
+void D_FillRect (vrect_t *rect, int color)
+{
+	int				rx, ry, rwidth, rheight;
+	unsigned char	*dest;
+	unsigned		*ldest;
+
+	rx = rect->x;
+	ry = rect->y;
+	rwidth = rect->width;
+	rheight = rect->height;
+
+	if (rx < 0)
+	{
+		rwidth += rx;
+		rx = 0;
+	}
+	if (ry < 0)
+	{
+		rheight += ry;
+		ry = 0;
+	}
+	if (rx+rwidth > vid.width)
+		rwidth = vid.width - rx;
+	if (ry+rheight > vid.height)
+		rheight = vid.height - rx;
+		
+	if (rwidth < 1 || rheight < 1)
+		return;
+
+	dest = ((byte *)vid.buffer + ry*vid.rowbytes + rx);
+
+	if (((rwidth & 0x03) == 0) && (((long)dest & 0x03) == 0))
+	{
+	// faster aligned dword clear
+		ldest = (unsigned *)dest;
+		color += color << 16;
+
+		rwidth >>= 2;
+		color += color << 8;
+
+		for (ry=0 ; ry<rheight ; ry++)
+		{
+			for (rx=0 ; rx<rwidth ; rx++)
+				ldest[rx] = color;
+			ldest = (unsigned *)((byte*)ldest + vid.rowbytes);
+		}
+	}
+	else
+	{
+	// slower byte-by-byte clear for unaligned cases
+		for (ry=0 ; ry<rheight ; ry++)
+		{
+			for (rx=0 ; rx<rwidth ; rx++)
+				dest[rx] = color;
+			dest += vid.rowbytes;
+		}
+	}
+}
+