--- ray/src/px/vgaimage.c	1992/11/02 16:01:17	2.4
+++ ray/src/px/vgaimage.c	2003/02/22 02:07:28	2.10
@@ -1,9 +1,6 @@
-/* Copyright (c) 1992 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: vgaimage.c,v 2.10 2003/02/22 02:07:28 greg Exp $";
 #endif
-
 /*
  *  vgaimage.c - driver for VGA board under DOS
  */
@@ -86,7 +83,7 @@ char  *argv[];
 	int  i;
 
 	progname = argv[0] = fixargv0(argv[0]);
-	if ((gv = getenv("GAMMA")) != NULL)
+	if ((gv = getenv("DISPLAY_GAMMA")) != NULL)
 		gamcor = atof(gv);
 
 	for (i = 1; i < argc; i++)
@@ -147,6 +144,7 @@ userr:
 }
 
 
+int
 headline(s)		/* get relevant info from header */
 char  *s;
 {
@@ -158,6 +156,7 @@ char  *s;
 		formatval(fmt, s);
 		wrongformat = strcmp(fmt, COLRFMT);
 	}
+	return(0);
 }
 
 
@@ -168,10 +167,10 @@ init()			/* initialize and load display */
 		short	xsiz, ysiz;
 	} video[] = {
 		{_MRES256COLOR, 320, 200},
-		{_VRES256COLOR, 640, 400},
+		{_VRES256COLOR, 640, 480},
 		{_SVRES256COLOR, 800, 600},
 		{_XRES256COLOR, 1024, 768},
-		-1
+		{-1, 0, 0}
 	};
 	struct videoconfig	config;
 	register int	i;
@@ -186,12 +185,13 @@ init()			/* initialize and load display */
 	ms_init();
 	initialized = 1;
 	_getvideoconfig(&config);
-	if (maxcolors == 0)
-		maxcolors = config.numcolors;
-	if (maxcolors > 4) {
-		maxcolors -= minpix = 2;
-		_settextcolor(ourwhite);
-	}
+	if (maxcolors == 0 | maxcolors > config.numcolors)
+		maxcolors = config.numcolors-2;
+	if (maxcolors <= config.numcolors-2)
+		minpix = 2;
+	else
+		ourwhite = maxcolors-1;
+	_settextcolor(ourwhite);
 	cheight = config.numypixels/config.numtextrows;
 	cwidth = config.numxpixels/config.numtextcols;
 				/* clear scan position array */
@@ -375,11 +375,10 @@ setpalette()			/* set our palette using clrtab */
 	long	cvals[256];
 	register int	i;
 
-	if (minpix >= 2) {
-		cvals[ourblack] = _BLACK; cvals[ourwhite] = _BRIGHTWHITE;
-	}
+	cvals[ourblack] = _BLACK;
+	cvals[ourwhite] = _BRIGHTWHITE;
 	for (i = 0; i < maxcolors; i++)
-		cvals[i+minpix] = clrtab[i][BLU]<<14 & 0x3f0000L |
+		cvals[i+minpix] = (long)clrtab[i][BLU]<<14 & 0x3f0000L |
 				  clrtab[i][GRN]<<6 & 0x3f00 |
 				  clrtab[i][RED]>>2;
 	_remapallpalette(cvals);
@@ -395,8 +394,8 @@ greyimage()			/* display greyscale image */
 	setcolrgam(gamcor);
 					/* set up color map */
 	for (x = 0; x < maxcolors; x++)
-		clrtab[x][RED] = clrtab[x][GRN] =
-			clrtab[x][BLU] = ((long)x*256+maxcolors/2)/maxcolors;
+		clrtab[x][RED] = clrtab[x][GRN] = clrtab[x][BLU] =
+				((long)x*256 + 128)/maxcolors;
 	setpalette();
 	_setplotaction(_GPSET);
 					/* read and display file */
@@ -404,18 +403,20 @@ greyimage()			/* display greyscale image */
 		getscan(y);
 		if (scale)
 			shiftcolrs(scanline, xmax, scale);
+		for (x = 0; x < xmax; x++)
+			scanline[x][GRN] = normbright(scanline[x]);
 		colrs_gambs(scanline, xmax);
 		if (maxcolors < 256)
 			for (x = 0; x < xmax; x++) {
-				thiscolor = ((long)normbright(scanline[x]) *
-					maxcolors + 128) >> 8;
+				thiscolor = ((long)scanline[x][GRN] *
+						maxcolors + maxcolors/2) / 256;
 				if (thiscolor != lastcolor)
 					_setcolor((lastcolor=thiscolor)+minpix);
 				_setpixel(x, y);
 			}
 		else
 			for (x = 0; x < xmax; x++) {
-				thiscolor = normbright(scanline[x]);
+				thiscolor = scanline[x][GRN];
 				if (thiscolor != lastcolor)
 					_setcolor((lastcolor=thiscolor)+minpix);
 				_setpixel(x, y);
@@ -476,7 +477,7 @@ int  y;
 		if (fseek(fin, scanpos[y], 0) == -1)
 			quiterr("fseek error");
 		cury = y;
-	} else if (scanpos != NULL && scanpos[y] == -1)
+	} else if (fin != stdin && scanpos[y] == -1)
 		scanpos[y] = ftell(fin);
 
 	if (freadcolrs(scanline, xmax, fin) < 0)
@@ -597,4 +598,3 @@ ms_done()
     inregs.w.ax = 0;
     int386 (0x33, &inregs, &outregs);
 }
-