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add b&w mode (-b)

--- a/main.c

+++ b/main.c

@@ -23,6 +23,7 @@

 static uvlong dispdelay;

 static int framedrop;

 static uvlong late;

+static int bw;

 static void

 audioproc(void *x)

@@ -60,6 +61,7 @@

 {

 	uvlong x, end, left;

 	Rectangle r, clip;

+	int y;

 	x = nanosec();

 	if(lastframe == 0)

@@ -84,11 +86,16 @@

 	}

 	r = Rect(0,0,f->w,f->h);

 	if(curim == nil)

-		curim = allocimage(display, r, RGB24, 0, DNofill);

+		curim = allocimage(display, r, bw ? GREY8 : RGB24, 0, DNofill);

 	if(rgb == nil)

-		rgb = malloc(f->w*f->h*3);

-	yuv420_rgb24(f->w, f->h, f->yuv[0], f->yuv[1], f->yuv[2], f->ystride, f->uvstride, rgb, f->w*3);

-	loadimage(curim, r, rgb, f->w*f->h*3);

+		rgb = malloc(f->w*f->h*(bw ? 1 : 3));

+	if(bw){

+		for(y = 0; y < f->h; y++)

+			memmove(rgb+f->w*y, f->yuv[0]+f->ystride*y, f->w);

+	}else{

+		yuv420_rgb24(f->w, f->h, f->yuv[0], f->yuv[1], f->yuv[2], f->ystride, f->uvstride, rgb, f->w*3);

+	}

+	loadimage(curim, r, rgb, f->w*f->h*(bw ? 1 : 3));

 	dispdelay = nanosec() - x;

@@ -174,6 +181,9 @@

 			usage();

 		}

 		audio = EARGF(usage());

+		break;

+	case 'b':

+		bw++;

 		break;

 	case 'D':

 		framedrop++;