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rio: use -b instead of the $reverse env variable

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -46,6 +46,7 @@

 char		*fontname;

 int		mainpid;

+int		reverse;

 enum

 {

@@ -134,6 +135,9 @@

 	kbdin = nil;

 	maxtab = 0;

 	ARGBEGIN{

+	case 'b':

+		reverse = ~0xFF;

+		break;

 	case 'f':

 		fontname = ARGF();

 		if(fontname == nil)

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -21,9 +21,10 @@

 	MinWater	= 20000,	/* room to leave available when reallocating */

 };

+extern	int		reverse;	/* there are no pastel paints in the dungeons and dragons world -- rob pike */

+

 static	int		topped;

 static	int		id;

-static	int		reverse;

 static	Image	*cols[NCOL];

 static	Image	*grey;

@@ -43,13 +44,6 @@

 	Rectangle r;

 	if(cols[0] == nil){

-		/* there are no pastel paints in the dungeons and dragons world

-		 * - rob pike

-		 */

-		reverse = 0;

-		if(getenv("reverse") != nil)

-			reverse = ~0xFF;

-

 		/* greys are multiples of 0x11111100+0xFF, 14* being palest */

 		grey = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0xEEEEEEFF^reverse);

 		darkgrey = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0x666666FF^reverse);