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resample: add colorspace (-c) option

--- a/resample.c

+++ b/resample.c

@@ -18,10 +18,15 @@

     [STBIR_FILTER_MITCHELL] = "mitchell",

 };

+static char *cspaces[] = {

+	[STBIR_COLORSPACE_LINEAR] = "linear",

+	[STBIR_COLORSPACE_SRGB] = "srgb",

+};

+

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [-x size] [-y size] [-f filter]\n", argv0);

+	fprint(2, "usage: %s [-x size] [-y size] [-f filter] [-c colorspace]\n", argv0);

 	exits("usage");

 }

@@ -30,14 +35,15 @@

 {

 	Memimage *a, *b;

 	u8int *in, *out;

-	char *flts, *s;

+	char *flts, *s, *csps;

 	int n, w, h, bp;

 	int ow, oh, obp;

-	int wp, hp, f;

+	int wp, hp, f, c;

 	ow = oh = 0;

 	wp = hp = 0;

 	flts = filters[STBIR_FILTER_MITCHELL];

+	csps = cspaces[STBIR_COLORSPACE_LINEAR];

 	ARGBEGIN{

 	case 'x':

 		s = EARGF(usage());

@@ -50,6 +56,9 @@

 	case 'f':

 		flts = EARGF(usage());

 		break;

+	case 'c':

+		csps = EARGF(usage());

+		break;

 	default:

 		usage();

 	}ARGEND

@@ -68,6 +77,11 @@

 	if(f >= nelem(filters)){

 		fprint(2, "invalid filter %s\n", flts);

 		exits("filter");

+	}

+	for(c = 0; c < nelem(cspaces) && strcmp(csps, cspaces[c]) != 0; c++);

+	if(c >= nelem(cspaces)){

+		fprint(2, "invalid colorspace %s\n", csps);

+		exits("colorspace");

 	}

 	memimageinit();